gnunet-service-set.c File Reference

two-peer set operations More...

#include "platform.h"
#include "gnunet-service-set.h"
#include "gnunet-service-set_union.h"
#include "gnunet-service-set_intersection.h"
#include "gnunet-service-set_protocol.h"
#include "gnunet_statistics_service.h"

Include dependency graph for gnunet-service-set.c:

Go to the source code of this file.

Data Structures
struct	LazyCopyRequest
	Lazy copy requests made by a client. More...
struct	Listener
	A listener is inhabited by a client, and waits for evaluation requests from remote peers. More...
struct	GarbageContext
	Context for the garbage_collect_cb(). More...

Macros
#define	INCOMING_CHANNEL_TIMEOUT   GNUNET_TIME_UNIT_MINUTES
	How long do we hold on to an incoming channel if there is no local listener before giving up? More...

Functions
static struct Operation *	get_incoming (uint32_t id)
	Get the incoming socket associated with the given id. More...
static void	incoming_destroy (struct Operation *op)
	Destroy an incoming request from a remote peer. More...
static int	garbage_collect_cb (void *cls, const struct GNUNET_HashCode *key, void *value)
	Function invoked to check if an element can be removed from the set's history because it is no longer needed. More...
static void	collect_generation_garbage (struct Set *set)
	Collect and destroy elements that are not needed anymore, because their lifetime (as determined by their generation) does not overlap with any active set operation. More...
static int	is_excluded_generation (unsigned int generation, struct GenerationRange *excluded, unsigned int excluded_size)
	Is generation in the range of exclusions? More...
static int	is_element_of_generation (struct ElementEntry *ee, unsigned int query_generation, struct GenerationRange *excluded, unsigned int excluded_size)
	Is element ee part of the set during query_generation? More...
int	_GSS_is_element_of_operation (struct ElementEntry *ee, struct Operation *op)
	Is element ee part of the set used by op? More...
void	_GSS_operation_destroy (struct Operation *op, int gc)
	Destroy the given operation. More...
static void *	client_connect_cb (void *cls, struct GNUNET_SERVICE_Client *c, struct GNUNET_MQ_Handle *mq)
	Callback called when a client connects to the service. More...
static int	destroy_elements_iterator (void *cls, const struct GNUNET_HashCode *key, void *value)
	Iterator over hash map entries to free element entries. More...
static void	client_disconnect_cb (void *cls, struct GNUNET_SERVICE_Client *client, void *internal_cls)
	Clean up after a client has disconnected. More...
static int	check_incoming_msg (void *cls, const struct OperationRequestMessage *msg)
	Check a request for a set operation from another peer. More...
static void	handle_incoming_msg (void *cls, const struct OperationRequestMessage *msg)
	Handle a request for a set operation from another peer. More...
static void	execute_add (struct Set *set, const struct GNUNET_SET_ElementMessage *msg)
	Add an element to set as specified by msg. More...
static void	execute_remove (struct Set *set, const struct GNUNET_SET_ElementMessage *msg)
	Remove an element from set as specified by msg. More...
static void	execute_mutation (struct Set *set, const struct GNUNET_SET_ElementMessage *msg)
	Perform a mutation on a set as specified by the msg. More...
static void	execute_delayed_mutations (struct Set *set)
	Execute mutations that were delayed on a set because of pending operations. More...
static void	send_client_element (struct Set *set)
	Send the next element of a set to the set's client. More...
static void	handle_client_iterate (void *cls, const struct GNUNET_MessageHeader *m)
	Called when a client wants to iterate the elements of a set. More...
static void	handle_client_create_set (void *cls, const struct GNUNET_SET_CreateMessage *msg)
	Called when a client wants to create a new set. More...
static void	incoming_timeout_cb (void *cls)
	Timeout happens iff: More...
static void *	channel_new_cb (void *cls, struct GNUNET_CADET_Channel *channel, const struct GNUNET_PeerIdentity *source)
	Method called whenever another peer has added us to a channel the other peer initiated. More...
static void	channel_end_cb (void *channel_ctx, const struct GNUNET_CADET_Channel *channel)
	Function called whenever a channel is destroyed. More...
void	_GSS_operation_destroy2 (struct Operation *op)
	This function probably should not exist and be replaced by inlining more specific logic in the various places where it is called. More...
static void	channel_window_cb (void *cls, const struct GNUNET_CADET_Channel *channel, int window_size)
	Function called whenever an MQ-channel's transmission window size changes. More...
static void	handle_client_listen (void *cls, const struct GNUNET_SET_ListenMessage *msg)
	Called when a client wants to create a new listener. More...
static void	handle_client_reject (void *cls, const struct GNUNET_SET_RejectMessage *msg)
	Called when the listening client rejects an operation request by another peer. More...
static int	check_client_mutation (void *cls, const struct GNUNET_SET_ElementMessage *msg)
	Called when a client wants to add or remove an element to a set it inhabits. More...
static void	handle_client_mutation (void *cls, const struct GNUNET_SET_ElementMessage *msg)
	Called when a client wants to add or remove an element to a set it inhabits. More...
static void	advance_generation (struct Set *set)
	Advance the current generation of a set, adding exclusion ranges if necessary. More...
static int	check_client_evaluate (void *cls, const struct GNUNET_SET_EvaluateMessage *msg)
	Called when a client wants to initiate a set operation with another peer. More...
static void	handle_client_evaluate (void *cls, const struct GNUNET_SET_EvaluateMessage *msg)
	Called when a client wants to initiate a set operation with another peer. More...
static void	handle_client_iter_ack (void *cls, const struct GNUNET_SET_IterAckMessage *ack)
	Handle an ack from a client, and send the next element. More...
static void	handle_client_copy_lazy_prepare (void *cls, const struct GNUNET_MessageHeader *mh)
	Handle a request from the client to copy a set. More...
static void	handle_client_copy_lazy_connect (void *cls, const struct GNUNET_SET_CopyLazyConnectMessage *msg)
	Handle a request from the client to connect to a copy of a set. More...
static void	handle_client_cancel (void *cls, const struct GNUNET_SET_CancelMessage *msg)
	Handle a request from the client to cancel a running set operation. More...
static void	handle_client_accept (void *cls, const struct GNUNET_SET_AcceptMessage *msg)
	Handle a request from the client to accept a set operation that came from a remote peer. More...
static void	shutdown_task (void *cls)
	Called to clean up, after a shutdown has been requested. More...
static void	run (void *cls, const struct GNUNET_CONFIGURATION_Handle *cfg, struct GNUNET_SERVICE_Handle *service)
	Function called by the service's run method to run service-specific setup code. More...
	GNUNET_SERVICE_MAIN ("set", GNUNET_SERVICE_OPTION_NONE, &run, &client_connect_cb, &client_disconnect_cb, NULL, GNUNET_MQ_hd_fixed_size(client_accept, GNUNET_MESSAGE_TYPE_SET_ACCEPT, struct GNUNET_SET_AcceptMessage, NULL), GNUNET_MQ_hd_fixed_size(client_iter_ack, GNUNET_MESSAGE_TYPE_SET_ITER_ACK, struct GNUNET_SET_IterAckMessage, NULL), GNUNET_MQ_hd_var_size(client_mutation, GNUNET_MESSAGE_TYPE_SET_ADD, struct GNUNET_SET_ElementMessage, NULL), GNUNET_MQ_hd_fixed_size(client_create_set, GNUNET_MESSAGE_TYPE_SET_CREATE, struct GNUNET_SET_CreateMessage, NULL), GNUNET_MQ_hd_fixed_size(client_iterate, GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST, struct GNUNET_MessageHeader, NULL), GNUNET_MQ_hd_var_size(client_evaluate, GNUNET_MESSAGE_TYPE_SET_EVALUATE, struct GNUNET_SET_EvaluateMessage, NULL), GNUNET_MQ_hd_fixed_size(client_listen, GNUNET_MESSAGE_TYPE_SET_LISTEN, struct GNUNET_SET_ListenMessage, NULL), GNUNET_MQ_hd_fixed_size(client_reject, GNUNET_MESSAGE_TYPE_SET_REJECT, struct GNUNET_SET_RejectMessage, NULL), GNUNET_MQ_hd_var_size(client_mutation, GNUNET_MESSAGE_TYPE_SET_REMOVE, struct GNUNET_SET_ElementMessage, NULL), GNUNET_MQ_hd_fixed_size(client_cancel, GNUNET_MESSAGE_TYPE_SET_CANCEL, struct GNUNET_SET_CancelMessage, NULL), GNUNET_MQ_hd_fixed_size(client_copy_lazy_prepare, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_PREPARE, struct GNUNET_MessageHeader, NULL), GNUNET_MQ_hd_fixed_size(client_copy_lazy_connect, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_CONNECT, struct GNUNET_SET_CopyLazyConnectMessage, NULL), GNUNET_MQ_handler_end())
	Define "main" method using service macro. More...

Variables
static struct GNUNET_CADET_Handle *	cadet
	Handle to the cadet service, used to listen for and connect to remote peers. More...
static struct LazyCopyRequest *	lazy_copy_head
	DLL of lazy copy requests by this client. More...
static struct LazyCopyRequest *	lazy_copy_tail
	DLL of lazy copy requests by this client. More...
static uint32_t	lazy_copy_cookie
	Generator for unique cookie we set per lazy copy request. More...
struct GNUNET_STATISTICS_Handle *	_GSS_statistics
	Statistics handle. More...
static struct Listener *	listener_head
	Listeners are held in a doubly linked list. More...
static struct Listener *	listener_tail
	Listeners are held in a doubly linked list. More...
static unsigned int	num_clients
	Number of active clients. More...
static int	in_shutdown
	Are we in shutdown? if GNUNET_YES and the number of clients drops to zero, disconnect from CADET. More...
static uint32_t	suggest_id
	Counter for allocating unique IDs for clients, used to identify incoming operation requests from remote peers, that the client can choose to accept or refuse. More...

Detailed Description

two-peer set operations

Author

Florian Dold

Christian Grothoff

Definition in file gnunet-service-set.c.

Macro Definition Documentation

INCOMING_CHANNEL_TIMEOUT

#define INCOMING_CHANNEL_TIMEOUT   GNUNET_TIME_UNIT_MINUTES

How long do we hold on to an incoming channel if there is no local listener before giving up?

Definition at line 37 of file gnunet-service-set.c.

Function Documentation

get_incoming()

static struct Operation* get_incoming ( uint32_t  id )

static

Get the incoming socket associated with the given id.

Parameters

id	id to look for

Returns

the incoming socket associated with the id, or NULL if there is none

Definition at line 185 of file gnunet-service-set.c.

{
  for (struct Listener *listener = listener_head; NULL != listener;
       listener = listener->next)
  {
    for (struct Operation *op = listener->op_head; NULL != op; op = op->next)
      if (op->suggest_id == id)
        return op;
  }
  return NULL;
}

References Operation::listener, listener_head, Listener::next, GNUNET_ARM_Operation::next, op, and Listener::op_head.

Referenced by handle_client_accept(), and handle_client_reject().

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incoming_destroy()

static void incoming_destroy ( struct Operation *  op )

static

Destroy an incoming request from a remote peer.

Parameters

op	remote request to destroy

Definition at line 204 of file gnunet-service-set.c.

{
  struct Listener *listener;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Destroying incoming operation %p\n",
              op);
  if (NULL != (listener = op->listener))
  {
    GNUNET_CONTAINER_DLL_remove (listener->op_head, listener->op_tail, op);
    op->listener = NULL;
  }
  if (NULL != op->timeout_task)
  {
    GNUNET_SCHEDULER_cancel (op->timeout_task);
    op->timeout_task = NULL;
  }
  _GSS_operation_destroy2 (op);
}

References _GSS_operation_destroy2(), GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_SCHEDULER_cancel(), op, Listener::op_head, and Listener::op_tail.

Referenced by _GSS_operation_destroy2(), client_disconnect_cb(), and incoming_timeout_cb().

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garbage_collect_cb()

static int garbage_collect_cb ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Function invoked to check if an element can be removed from the set's history because it is no longer needed.

Parameters

cls	the struct GarbageContext *
key	key of the element in the map
value	the struct ElementEntry *

Returns

GNUNET_OK (continue to iterate)

Definition at line 257 of file gnunet-service-set.c.

{
  // struct GarbageContext *gc = cls;
  // struct ElementEntry *ee = value;
 
  // if (GNUNET_YES != ee->removed)
  //  return GNUNET_OK;
  // if ( (gc->max_op_generation < ee->generation_added) ||
  //     (ee->generation_removed > gc->min_op_generation) )
  // {
  //  GNUNET_assert (GNUNET_YES ==
  //                 GNUNET_CONTAINER_multihashmap_remove (gc->map,
  //                                                       key,
  //                                                       ee));
  //  GNUNET_free (ee);
  // }
  return GNUNET_OK;
}

References GNUNET_OK.

Referenced by collect_generation_garbage().

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collect_generation_garbage()

static void collect_generation_garbage ( struct Set *  set )

static

Collect and destroy elements that are not needed anymore, because their lifetime (as determined by their generation) does not overlap with any active set operation.

Parameters

set	set to garbage collect

Definition at line 285 of file gnunet-service-set.c.

{
  struct GarbageContext gc;
 
  gc.min_op_generation = UINT_MAX;
  gc.max_op_generation = 0;
  for (struct Operation *op = set->ops_head; NULL != op; op = op->next)
  {
    gc.min_op_generation =
      GNUNET_MIN (gc.min_op_generation, op->generation_created);
    gc.max_op_generation =
      GNUNET_MAX (gc.max_op_generation, op->generation_created);
  }
  gc.map = set->content->elements;
  GNUNET_CONTAINER_multihashmap_iterate (set->content->elements,
                                         &garbage_collect_cb,
                                         &gc);
}

References Set::content, SetContent::elements, garbage_collect_cb(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_MAX, GNUNET_MIN, GarbageContext::map, GarbageContext::max_op_generation, GarbageContext::min_op_generation, GNUNET_ARM_Operation::next, op, and Set::ops_head.

Referenced by _GSS_operation_destroy().

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is_excluded_generation()

static int is_excluded_generation ( unsigned int  generation, struct GenerationRange *  excluded, unsigned int  excluded_size  )

static

Is generation in the range of exclusions?

Parameters

generation	generation to query
excluded	array of generations where the element is excluded
excluded_size	length of the excluded array

Returns

GNUNET_YES if generation is in any of the ranges

Definition at line 314 of file gnunet-service-set.c.

{
  for (unsigned int i = 0; i < excluded_size; i++)
    if ((generation >= excluded[i].start) && (generation < excluded[i].end))
      return GNUNET_YES;
  return GNUNET_NO;
}

References end, GNUNET_NO, GNUNET_YES, and start.

Referenced by is_element_of_generation().

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is_element_of_generation()

static int is_element_of_generation ( struct ElementEntry *  ee, unsigned int  query_generation, struct GenerationRange *  excluded, unsigned int  excluded_size  )

static

Is element ee part of the set during query_generation?

Parameters

ee	element to test
query_generation	generation to query
excluded	array of generations where the element is excluded
excluded_size	length of the excluded array

Returns

GNUNET_YES if the element is in the set, GNUNET_NO if not

Definition at line 335 of file gnunet-service-set.c.

{
  struct MutationEvent *mut;
  int is_present;
 
  GNUNET_assert (NULL != ee->mutations);
  if (GNUNET_YES ==
      is_excluded_generation (query_generation, excluded, excluded_size))
  {
    GNUNET_break (0);
    return GNUNET_NO;
  }
 
  is_present = GNUNET_NO;
 
  /* Could be made faster with binary search, but lists
     are small, so why bother. */
  for (unsigned int i = 0; i < ee->mutations_size; i++)
  {
    mut = &ee->mutations[i];
 
    if (mut->generation > query_generation)
    {
      /* The mutation doesn't apply to our generation
         anymore.  We can'b break here, since mutations aren't
         sorted by generation. */
      continue;
    }
 
    if (GNUNET_YES ==
        is_excluded_generation (mut->generation, excluded, excluded_size))
    {
      /* The generation is excluded (because it belongs to another
         fork via a lazy copy) and thus mutations aren't considered
         for membership testing. */
      continue;
    }
 
    /* This would be an inconsistency in how we manage mutations. */
    if ((GNUNET_YES == is_present) && (GNUNET_YES == mut->added))
      GNUNET_assert (0);
    /* Likewise. */
    if ((GNUNET_NO == is_present) && (GNUNET_NO == mut->added))
      GNUNET_assert (0);
 
    is_present = mut->added;
  }
 
  return is_present;
}

References MutationEvent::added, MutationEvent::generation, GNUNET_assert, GNUNET_break, GNUNET_NO, GNUNET_YES, is_excluded_generation(), ElementEntry::mutations, and ElementEntry::mutations_size.

Referenced by _GSS_is_element_of_operation(), execute_add(), execute_remove(), and send_client_element().

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_GSS_is_element_of_operation()

int _GSS_is_element_of_operation	(	struct ElementEntry *	ee,
		struct Operation *	op
	)

Is element ee part of the set used by op?

Parameters

ee	element to test
op	operation the defines the set and its generation

Returns

GNUNET_YES if the element is in the set, GNUNET_NO if not

Definition at line 398 of file gnunet-service-set.c.

{
  return is_element_of_generation (ee,
                                   op->generation_created,
                                   op->set->excluded_generations,
                                   op->set->excluded_generations_size);
}

References is_element_of_generation(), and op.

Referenced by filtered_map_initialization(), handle_union_p2p_demand(), handle_union_p2p_offer(), init_key_to_element_iterator(), and initialize_map_unfiltered().

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_GSS_operation_destroy()

void _GSS_operation_destroy	(	struct Operation *	op,
		int	gc
	)

Destroy the given operation.

Used for any operation where both peers were known and that thus actually had a vt and channel. Must not be used for operations where 'listener' is still set and we do not know the other peer.

Call the implementation-specific cancel function of the operation. Disconnects from the remote peer. Does not disconnect the client, as there may be multiple operations per set.

Parameters

op	operation to destroy
gc	GNUNET_YES to perform garbage collection on the set

Definition at line 421 of file gnunet-service-set.c.

{
  struct Set *set = op->set;
  struct GNUNET_CADET_Channel *channel;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying operation %p\n", op);
  GNUNET_assert (NULL == op->listener);
  if (NULL != op->state)
  {
    set->vt->cancel (op);
    op->state = NULL;
  }
  if (NULL != set)
  {
    GNUNET_CONTAINER_DLL_remove (set->ops_head, set->ops_tail, op);
    op->set = NULL;
  }
  if (NULL != op->context_msg)
  {
    GNUNET_free (op->context_msg);
    op->context_msg = NULL;
  }
  if (NULL != (channel = op->channel))
  {
    /* This will free op; called conditionally as this helper function
       is also called from within the channel disconnect handler. */
    op->channel = NULL;
    GNUNET_CADET_channel_destroy (channel);
  }
  if ((NULL != set) && (GNUNET_YES == gc))
    collect_generation_garbage (set);
  /* We rely on the channel end handler to free 'op'. When 'op->channel' was NULL,
   * there was a channel end handler that will free 'op' on the call stack. */
}

References SetVT::cancel, collect_generation_garbage(), GNUNET_assert, GNUNET_CADET_channel_destroy(), GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_YES, op, Set::ops_head, Set::ops_tail, and Set::vt.

Referenced by _GSS_operation_destroy2(), client_disconnect_cb(), fail_intersection_operation(), fail_union_operation(), handle_client_cancel(), intersection_channel_death(), send_client_done_and_destroy(), and union_channel_death().

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client_connect_cb()

static void* client_connect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  c, struct GNUNET_MQ_Handle *  mq  )

static

Callback called when a client connects to the service.

Parameters

cls	closure for the service
c	the new client that connected to the service
mq	the message queue used to send messages to the client

Returns

struct ClientState

Definition at line 466 of file gnunet-service-set.c.

{
  struct ClientState *cs;
 
  num_clients++;
  cs = GNUNET_new (struct ClientState);
  cs->client = c;
  cs->mq = mq;
  return cs;
}

References ClientState::client, GNUNET_new, mq, ClientState::mq, and num_clients.

destroy_elements_iterator()

static int destroy_elements_iterator ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Iterator over hash map entries to free element entries.

Parameters

cls	closure
key	current key code
value	a struct ElementEntry * to be free'd

Returns

GNUNET_YES (continue to iterate)

Definition at line 489 of file gnunet-service-set.c.

{
  struct ElementEntry *ee = value;
 
  GNUNET_free (ee->mutations);
  GNUNET_free (ee);
  return GNUNET_YES;
}

References GNUNET_free, GNUNET_YES, ElementEntry::mutations, and value.

Referenced by client_disconnect_cb().

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client_disconnect_cb()

static void client_disconnect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  client, void *  internal_cls  )

static

Clean up after a client has disconnected.

Parameters

cls	closure, unused
client	the client to clean up after
internal_cls	the struct ClientState

Definition at line 509 of file gnunet-service-set.c.

{
  struct ClientState *cs = internal_cls;
  struct Operation *op;
  struct Listener *listener;
  struct Set *set;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected, cleaning up\n");
  if (NULL != (set = cs->set))
  {
    struct SetContent *content = set->content;
    struct PendingMutation *pm;
    struct PendingMutation *pm_current;
    struct LazyCopyRequest *lcr;
 
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying client's set\n");
    /* Destroy pending set operations */
    while (NULL != set->ops_head)
      _GSS_operation_destroy (set->ops_head, GNUNET_NO);
 
    /* Destroy operation-specific state */
    GNUNET_assert (NULL != set->state);
    set->vt->destroy_set (set->state);
    set->state = NULL;
 
    /* Clean up ongoing iterations */
    if (NULL != set->iter)
    {
      GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
      set->iter = NULL;
      set->iteration_id++;
    }
 
    /* discard any pending mutations that reference this set */
    pm = content->pending_mutations_head;
    while (NULL != pm)
    {
      pm_current = pm;
      pm = pm->next;
      if (pm_current->set == set)
      {
        GNUNET_CONTAINER_DLL_remove (content->pending_mutations_head,
                                     content->pending_mutations_tail,
                                     pm_current);
        GNUNET_free (pm_current);
      }
    }
 
    /* free set content (or at least decrement RC) */
    set->content = NULL;
    GNUNET_assert (0 != content->refcount);
    content->refcount--;
    if (0 == content->refcount)
    {
      GNUNET_assert (NULL != content->elements);
      GNUNET_CONTAINER_multihashmap_iterate (content->elements,
                                             &destroy_elements_iterator,
                                             NULL);
      GNUNET_CONTAINER_multihashmap_destroy (content->elements);
      content->elements = NULL;
      GNUNET_free (content);
    }
    GNUNET_free (set->excluded_generations);
    set->excluded_generations = NULL;
 
    /* remove set from pending copy requests */
    lcr = lazy_copy_head;
    while (NULL != lcr)
    {
      struct LazyCopyRequest *lcr_current = lcr;
 
      lcr = lcr->next;
      if (lcr_current->source_set == set)
      {
        GNUNET_CONTAINER_DLL_remove (lazy_copy_head,
                                     lazy_copy_tail,
                                     lcr_current);
        GNUNET_free (lcr_current);
      }
    }
    GNUNET_free (set);
  }
 
  if (NULL != (listener = cs->listener))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying client's listener\n");
    GNUNET_CADET_close_port (listener->open_port);
    listener->open_port = NULL;
    while (NULL != (op = listener->op_head))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Destroying incoming operation `%u' from peer `%s'\n",
                  (unsigned int) op->client_request_id,
                  GNUNET_i2s (&op->peer));
      incoming_destroy (op);
    }
    GNUNET_CONTAINER_DLL_remove (listener_head, listener_tail, listener);
    GNUNET_free (listener);
  }
  GNUNET_free (cs);
  num_clients--;
  if ((GNUNET_YES == in_shutdown) && (0 == num_clients))
  {
    if (NULL != cadet)
    {
      GNUNET_CADET_disconnect (cadet);
      cadet = NULL;
    }
  }
}

References _GSS_operation_destroy(), cadet, Set::content, Set::cs, destroy_elements_iterator(), SetVT::destroy_set, SetContent::elements, Set::excluded_generations, GNUNET_assert, GNUNET_CADET_close_port(), GNUNET_CADET_disconnect(), GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_CONTAINER_multihashmap_iterator_destroy(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_NO, GNUNET_YES, in_shutdown, incoming_destroy(), Set::iter, Set::iteration_id, lazy_copy_head, lazy_copy_tail, ClientState::listener, listener_head, listener_tail, LazyCopyRequest::next, num_clients, op, Listener::op_head, Listener::open_port, Set::ops_head, SetContent::pending_mutations_head, SetContent::pending_mutations_tail, pm, SetContent::refcount, ClientState::set, PendingMutation::set, LazyCopyRequest::source_set, Set::state, and Set::vt.

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check_incoming_msg()

static int check_incoming_msg ( void *  cls, const struct OperationRequestMessage *  msg  )

static

Check a request for a set operation from another peer.

Parameters

cls	the operation state
msg	the received message

Returns

GNUNET_OK if the channel should be kept alive, GNUNET_SYSERR to destroy the channel

Definition at line 632 of file gnunet-service-set.c.

{
  struct Operation *op = cls;
  struct Listener *listener = op->listener;
  const struct GNUNET_MessageHeader *nested_context;
 
  /* double operation request */
  if (0 != op->suggest_id)
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  /* This should be equivalent to the previous condition, but can't hurt to check twice */
  if (NULL == op->listener)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (listener->operation !=
      (enum GNUNET_SET_OperationType) ntohl (msg->operation))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  nested_context = GNUNET_MQ_extract_nested_mh (msg);
  if ((NULL != nested_context) &&
      (ntohs (nested_context->size) > GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References GNUNET_break, GNUNET_break_op, GNUNET_MQ_extract_nested_mh, GNUNET_OK, GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE, GNUNET_SYSERR, msg, op, Listener::operation, and GNUNET_MessageHeader::size.

handle_incoming_msg()

static void handle_incoming_msg ( void *  cls, const struct OperationRequestMessage *  msg  )

static

Handle a request for a set operation from another peer.

Checks if we have a listener waiting for such a request (and in that case initiates asking the listener about accepting the connection). If no listener is waiting, we queue the operation request in hope that a listener shows up soon (before timeout).

This msg is expected as the first and only msg handled through the non-operation bound virtual table, acceptance of this operation replaces our virtual table and subsequent msgs would be routed differently (as we then know what type of operation this is).

Parameters

cls	the operation state
msg	the received message

Returns

GNUNET_OK if the channel should be kept alive, GNUNET_SYSERR to destroy the channel

Definition at line 685 of file gnunet-service-set.c.

{
  struct Operation *op = cls;
  struct Listener *listener = op->listener;
  const struct GNUNET_MessageHeader *nested_context;
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_SET_RequestMessage *cmsg;
 
  nested_context = GNUNET_MQ_extract_nested_mh (msg);
  /* Make a copy of the nested_context (application-specific context
     information that is opaque to set) so we can pass it to the
     listener later on */
  if (NULL != nested_context)
    op->context_msg = GNUNET_copy_message (nested_context);
  op->remote_element_count = ntohl (msg->element_count);
  GNUNET_log (
    GNUNET_ERROR_TYPE_DEBUG,
    "Received P2P operation request (op %u, port %s) for active listener\n",
    (uint32_t) ntohl (msg->operation),
    GNUNET_h2s (&op->listener->app_id));
  GNUNET_assert (0 == op->suggest_id);
  if (0 == suggest_id)
    suggest_id++;
  op->suggest_id = suggest_id++;
  GNUNET_assert (NULL != op->timeout_task);
  GNUNET_SCHEDULER_cancel (op->timeout_task);
  op->timeout_task = NULL;
  env = GNUNET_MQ_msg_nested_mh (cmsg,
                                 GNUNET_MESSAGE_TYPE_SET_REQUEST,
                                 op->context_msg);
  GNUNET_log (
    GNUNET_ERROR_TYPE_DEBUG,
    "Suggesting incoming request with accept id %u to listener %p of client %p\n",
    op->suggest_id,
    listener,
    listener->cs);
  cmsg->accept_id = htonl (op->suggest_id);
  cmsg->peer_id = op->peer;
  GNUNET_MQ_send (listener->cs->mq, env);
  /* NOTE: GNUNET_CADET_receive_done() will be called in
   #handle_client_accept() */
}

References GNUNET_SET_RequestMessage::accept_id, Listener::cs, env, GNUNET_assert, GNUNET_copy_message(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SET_REQUEST, GNUNET_MQ_extract_nested_mh, GNUNET_MQ_msg_nested_mh, GNUNET_MQ_send(), GNUNET_SCHEDULER_cancel(), ClientState::mq, msg, op, GNUNET_SET_RequestMessage::peer_id, and suggest_id.

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execute_add()

static void execute_add ( struct Set *  set, const struct GNUNET_SET_ElementMessage *  msg  )

static

Add an element to set as specified by msg.

Parameters

set	set to manipulate
msg	message specifying the change

Definition at line 736 of file gnunet-service-set.c.

{
  struct GNUNET_SET_Element el;
  struct ElementEntry *ee;
  struct GNUNET_HashCode hash;
 
  GNUNET_assert (GNUNET_MESSAGE_TYPE_SET_ADD == ntohs (msg->header.type));
  el.size = ntohs (msg->header.size) - sizeof(*msg);
  el.data = &msg[1];
  el.element_type = ntohs (msg->element_type);
  GNUNET_SET_element_hash (&el, &hash);
  ee = GNUNET_CONTAINER_multihashmap_get (set->content->elements, &hash);
  if (NULL == ee)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client inserts element %s of size %u\n",
                GNUNET_h2s (&hash),
                el.size);
    ee = GNUNET_malloc (el.size + sizeof(*ee));
    ee->element.size = el.size;
    GNUNET_memcpy (&ee[1], el.data, el.size);
    ee->element.data = &ee[1];
    ee->element.element_type = el.element_type;
    ee->remote = GNUNET_NO;
    ee->mutations = NULL;
    ee->mutations_size = 0;
    ee->element_hash = hash;
    GNUNET_break (GNUNET_YES ==
                  GNUNET_CONTAINER_multihashmap_put (
                    set->content->elements,
                    &ee->element_hash,
                    ee,
                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  }
  else if (GNUNET_YES ==
           is_element_of_generation (ee,
                                     set->current_generation,
                                     set->excluded_generations,
                                     set->excluded_generations_size))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client inserted element %s of size %u twice (ignored)\n",
                GNUNET_h2s (&hash),
                el.size);
 
    /* same element inserted twice */
    return;
  }
 
  {
    struct MutationEvent mut = { .generation = set->current_generation,
                                 .added = GNUNET_YES };
    GNUNET_array_append (ee->mutations, ee->mutations_size, mut);
  }
  set->vt->add (set->state, ee);
}

References SetVT::add, Set::content, Set::current_generation, GNUNET_SET_Element::data, el, ElementEntry::element, ElementEntry::element_hash, GNUNET_SET_Element::element_type, SetContent::elements, Set::excluded_generations, Set::excluded_generations_size, MutationEvent::generation, GNUNET_array_append, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_SET_ADD, GNUNET_NO, GNUNET_SET_element_hash(), GNUNET_YES, is_element_of_generation(), msg, ElementEntry::mutations, ElementEntry::mutations_size, ElementEntry::remote, GNUNET_MessageHeader::size, GNUNET_SET_Element::size, Set::state, GNUNET_MessageHeader::type, and Set::vt.

Referenced by execute_mutation().

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execute_remove()

static void execute_remove ( struct Set *  set, const struct GNUNET_SET_ElementMessage *  msg  )

static

Remove an element from set as specified by msg.

Parameters

set	set to manipulate
msg	message specifying the change

Definition at line 801 of file gnunet-service-set.c.

{
  struct GNUNET_SET_Element el;
  struct ElementEntry *ee;
  struct GNUNET_HashCode hash;
 
  GNUNET_assert (GNUNET_MESSAGE_TYPE_SET_REMOVE == ntohs (msg->header.type));
  el.size = ntohs (msg->header.size) - sizeof(*msg);
  el.data = &msg[1];
  el.element_type = ntohs (msg->element_type);
  GNUNET_SET_element_hash (&el, &hash);
  ee = GNUNET_CONTAINER_multihashmap_get (set->content->elements, &hash);
  if (NULL == ee)
  {
    /* Client tried to remove non-existing element. */
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client removes non-existing element of size %u\n",
                el.size);
    return;
  }
  if (GNUNET_NO == is_element_of_generation (ee,
                                             set->current_generation,
                                             set->excluded_generations,
                                             set->excluded_generations_size))
  {
    /* Client tried to remove element twice */
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client removed element of size %u twice (ignored)\n",
                el.size);
    return;
  }
  else
  {
    struct MutationEvent mut = { .generation = set->current_generation,
                                 .added = GNUNET_NO };
 
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client removes element of size %u\n",
                el.size);
 
    GNUNET_array_append (ee->mutations, ee->mutations_size, mut);
  }
  set->vt->remove (set->state, ee);
}

References Set::content, Set::current_generation, el, SetContent::elements, Set::excluded_generations, Set::excluded_generations_size, MutationEvent::generation, GNUNET_array_append, GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_SET_REMOVE, GNUNET_NO, GNUNET_SET_element_hash(), is_element_of_generation(), msg, ElementEntry::mutations, ElementEntry::mutations_size, SetVT::remove, GNUNET_MessageHeader::size, Set::state, GNUNET_MessageHeader::type, and Set::vt.

Referenced by execute_mutation().

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execute_mutation()

static void execute_mutation ( struct Set *  set, const struct GNUNET_SET_ElementMessage *  msg  )

static

Perform a mutation on a set as specified by the msg.

Parameters

set	the set to mutate
msg	specification of what to change

Definition at line 854 of file gnunet-service-set.c.

{
  switch (ntohs (msg->header.type))
  {
  case GNUNET_MESSAGE_TYPE_SET_ADD:
    execute_add (set, msg);
    break;
 
  case GNUNET_MESSAGE_TYPE_SET_REMOVE:
    execute_remove (set, msg);
    break;
 
  default:
    GNUNET_break (0);
  }
}

References execute_add(), execute_remove(), GNUNET_break, GNUNET_MESSAGE_TYPE_SET_ADD, GNUNET_MESSAGE_TYPE_SET_REMOVE, msg, and GNUNET_MessageHeader::type.

Referenced by execute_delayed_mutations(), and handle_client_mutation().

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execute_delayed_mutations()

static void execute_delayed_mutations ( struct Set *  set )

static

Execute mutations that were delayed on a set because of pending operations.

Parameters

set	the set to execute mutations on

Definition at line 879 of file gnunet-service-set.c.

{
  struct PendingMutation *pm;
 
  if (0 != set->content->iterator_count)
    return; /* still cannot do this */
  while (NULL != (pm = set->content->pending_mutations_head))
  {
    GNUNET_CONTAINER_DLL_remove (set->content->pending_mutations_head,
                                 set->content->pending_mutations_tail,
                                 pm);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Executing pending mutation on %p.\n",
                pm->set);
    execute_mutation (pm->set, pm->msg);
    GNUNET_free (pm->msg);
    GNUNET_free (pm);
  }
}

References Set::content, execute_mutation(), GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, SetContent::iterator_count, SetContent::pending_mutations_head, SetContent::pending_mutations_tail, pm, and PendingMutation::set.

Referenced by send_client_element().

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send_client_element()

static void send_client_element ( struct Set *  set )

static

Send the next element of a set to the set's client.

The next element is given by the set's current hashmap iterator. The set's iterator will be set to NULL if there are no more elements in the set. The caller must ensure that the set's iterator is valid.

The client will acknowledge each received element with a GNUNET_MESSAGE_TYPE_SET_ITER_ACK message. Our handle_client_iter_ack() will then trigger the next transmission. Note that the GNUNET_MESSAGE_TYPE_SET_ITER_DONE is not acknowledged.

Parameters

set	set that should send its next element to its client

Definition at line 914 of file gnunet-service-set.c.

{
  int ret;
  struct ElementEntry *ee;
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SET_IterResponseMessage *msg;
 
  GNUNET_assert (NULL != set->iter);
  do
  {
    ret = GNUNET_CONTAINER_multihashmap_iterator_next (set->iter,
                                                       NULL,
                                                       (const void **) &ee);
    if (GNUNET_NO == ret)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Iteration on %p done.\n", set);
      ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_DONE);
      GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
      set->iter = NULL;
      set->iteration_id++;
      GNUNET_assert (set->content->iterator_count > 0);
      set->content->iterator_count--;
      execute_delayed_mutations (set);
      GNUNET_MQ_send (set->cs->mq, ev);
      return;
    }
    GNUNET_assert (NULL != ee);
  }
  while (GNUNET_NO ==
         is_element_of_generation (ee,
                                   set->iter_generation,
                                   set->excluded_generations,
                                   set->excluded_generations_size));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending iteration element on %p.\n",
              set);
  ev = GNUNET_MQ_msg_extra (msg,
                            ee->element.size,
                            GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT);
  GNUNET_memcpy (&msg[1], ee->element.data, ee->element.size);
  msg->element_type = htons (ee->element.element_type);
  msg->iteration_id = htons (set->iteration_id);
  GNUNET_MQ_send (set->cs->mq, ev);
}

References Set::content, Set::cs, GNUNET_SET_Element::data, ElementEntry::element, GNUNET_SET_Element::element_type, Set::excluded_generations, Set::excluded_generations_size, execute_delayed_mutations(), GNUNET_assert, GNUNET_CONTAINER_multihashmap_iterator_destroy(), GNUNET_CONTAINER_multihashmap_iterator_next(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_SET_ITER_DONE, GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT, GNUNET_MQ_msg_extra, GNUNET_MQ_msg_header, GNUNET_MQ_send(), GNUNET_NO, is_element_of_generation(), Set::iter, Set::iter_generation, Set::iteration_id, SetContent::iterator_count, ClientState::mq, msg, ret, and GNUNET_SET_Element::size.

Referenced by handle_client_iter_ack(), and handle_client_iterate().

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handle_client_iterate()

static void handle_client_iterate ( void *  cls, const struct GNUNET_MessageHeader *  m  )

static

Called when a client wants to iterate the elements of a set.

Checks if we have a set associated with the client and if we can right now start an iteration. If all checks out, starts sending the elements of the set to the client.

Parameters

cls	client that sent the message
m	message sent by the client

Definition at line 970 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
 
  if (NULL == (set = cs->set))
  {
    /* attempt to iterate over a non existing set */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  if (NULL != set->iter)
  {
    /* Only one concurrent iterate-action allowed per set */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Iterating set %p in gen %u with %u content elements\n",
              (void *) set,
              set->current_generation,
              GNUNET_CONTAINER_multihashmap_size (set->content->elements));
  GNUNET_SERVICE_client_continue (cs->client);
  set->content->iterator_count++;
  set->iter =
    GNUNET_CONTAINER_multihashmap_iterator_create (set->content->elements);
  set->iter_generation = set->current_generation;
  send_client_element (set);
}

References ClientState::client, Set::content, Set::cs, Set::current_generation, SetContent::elements, GNUNET_break, GNUNET_CONTAINER_multihashmap_iterator_create(), GNUNET_CONTAINER_multihashmap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), Set::iter, Set::iter_generation, SetContent::iterator_count, send_client_element(), and ClientState::set.

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handle_client_create_set()

static void handle_client_create_set ( void *  cls, const struct GNUNET_SET_CreateMessage *  msg  )

static

Called when a client wants to create a new set.

This is typically the first request from a client, and includes the type of set operation to be performed.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1012 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client created new set (operation %u)\n",
              (uint32_t) ntohl (msg->operation));
  if (NULL != cs->set)
  {
    /* There can only be one set per client */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  set = GNUNET_new (struct Set);
  switch (ntohl (msg->operation))
  {
  case GNUNET_SET_OPERATION_INTERSECTION:
    set->vt = _GSS_intersection_vt ();
    break;
 
  case GNUNET_SET_OPERATION_UNION:
    set->vt = _GSS_union_vt ();
    break;
 
  default:
    GNUNET_free (set);
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  set->operation = (enum GNUNET_SET_OperationType) ntohl (msg->operation);
  set->state = set->vt->create ();
  if (NULL == set->state)
  {
    /* initialization failed (i.e. out of memory) */
    GNUNET_free (set);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  set->content = GNUNET_new (struct SetContent);
  set->content->refcount = 1;
  set->content->elements = GNUNET_CONTAINER_multihashmap_create (1, GNUNET_YES);
  set->cs = cs;
  cs->set = set;
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_intersection_vt(), _GSS_union_vt(), ClientState::client, Set::content, SetVT::create, Set::cs, SetContent::elements, GNUNET_break, GNUNET_CONTAINER_multihashmap_create(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SET_OPERATION_INTERSECTION, GNUNET_SET_OPERATION_UNION, GNUNET_YES, msg, Set::operation, SetContent::refcount, ClientState::set, Set::state, and Set::vt.

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incoming_timeout_cb()

static void incoming_timeout_cb ( void *  cls )

static

Timeout happens iff:

• we suggested an operation to our listener, but did not receive a response in time
• we got the channel from a peer but no GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST

Parameters

cls	channel context

Definition at line 1071 of file gnunet-service-set.c.

{
  struct Operation *op = cls;
 
  op->timeout_task = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Remote peer's incoming request timed out\n");
  incoming_destroy (op);
}

References GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, incoming_destroy(), and op.

Referenced by channel_new_cb().

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channel_new_cb()

static void* channel_new_cb ( void *  cls, struct GNUNET_CADET_Channel *  channel, const struct GNUNET_PeerIdentity *  source  )

static

Method called whenever another peer has added us to a channel the other peer initiated.

Only called (once) upon reception of data from a channel we listen on.

The channel context represents the operation itself and gets added to a DLL, from where it gets looked up when our local listener client responds to a proposed/suggested operation or connects and associates with this operation.

Parameters

cls	closure
channel	new handle to the channel
source	peer that started the channel

Returns

initial channel context for the channel returns NULL on error

Definition at line 1099 of file gnunet-service-set.c.

{
  struct Listener *listener = cls;
  struct Operation *op;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "New incoming channel\n");
  op = GNUNET_new (struct Operation);
  op->listener = listener;
  op->peer = *source;
  op->channel = channel;
  op->mq = GNUNET_CADET_get_mq (op->channel);
  op->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
  op->timeout_task = GNUNET_SCHEDULER_add_delayed (INCOMING_CHANNEL_TIMEOUT,
                                                   &incoming_timeout_cb,
                                                   op);
  GNUNET_CONTAINER_DLL_insert (listener->op_head, listener->op_tail, op);
  return op;
}

References Operation::channel, GNUNET_CADET_get_mq(), GNUNET_CONTAINER_DLL_insert, GNUNET_CRYPTO_QUALITY_NONCE, GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, GNUNET_SCHEDULER_add_delayed(), INCOMING_CHANNEL_TIMEOUT, incoming_timeout_cb(), Operation::listener, op, Listener::op_head, Listener::op_tail, and source.

Referenced by handle_client_listen().

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channel_end_cb()

static void channel_end_cb ( void *  channel_ctx, const struct GNUNET_CADET_Channel *  channel  )

static

Function called whenever a channel is destroyed.

Should clean up any associated state. It must NOT call GNUNET_CADET_channel_destroy() on the channel.

The peer_disconnect function is part of a a virtual table set initially either when a peer creates a new channel with us, or once we create a new channel ourselves (evaluate).

Once we know the exact type of operation (union/intersection), the vt is replaced with an operation specific instance (GSS[op]_vt).

Parameters

channel_ctx	place where local state associated with the channel is stored
channel	connection to the other end (henceforth invalid)

Definition at line 1138 of file gnunet-service-set.c.

{
  struct Operation *op = channel_ctx;
 
  op->channel = NULL;
  _GSS_operation_destroy2 (op);
}

References _GSS_operation_destroy2(), and op.

Referenced by handle_client_evaluate(), and handle_client_listen().

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_GSS_operation_destroy2()

static void _GSS_operation_destroy2

(

struct Operation *

op

)

This function probably should not exist and be replaced by inlining more specific logic in the various places where it is called.

Definition at line 1153 of file gnunet-service-set.c.

{
  struct GNUNET_CADET_Channel *channel;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "channel_end_cb called\n");
  if (NULL != (channel = op->channel))
  {
    /* This will free op; called conditionally as this helper function
       is also called from within the channel disconnect handler. */
    op->channel = NULL;
    GNUNET_CADET_channel_destroy (channel);
  }
  if (NULL != op->listener)
  {
    incoming_destroy (op);
    return;
  }
  if (NULL != op->set)
    op->set->vt->channel_death (op);
  else
    _GSS_operation_destroy (op, GNUNET_YES);
  GNUNET_free (op);
}

References _GSS_operation_destroy(), GNUNET_CADET_channel_destroy(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_YES, incoming_destroy(), and op.

Referenced by channel_end_cb(), handle_client_reject(), handle_union_p2p_full_done(), incoming_destroy(), and maybe_finish().

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channel_window_cb()

static void channel_window_cb ( void *  cls, const struct GNUNET_CADET_Channel *  channel, int  window_size  )

static

Function called whenever an MQ-channel's transmission window size changes.

The first callback in an outgoing channel will be with a non-zero value and will mean the channel is connected to the destination.

For an incoming channel it will be called immediately after the GNUNET_CADET_ConnectEventHandler, also with a non-zero value.

Parameters

cls	Channel closure.
channel	Connection to the other end (henceforth invalid).
window_size	New window size. If the is more messages than buffer size this value will be negative..

Definition at line 1193 of file gnunet-service-set.c.

{
  /* FIXME: not implemented, we could do flow control here... */
}

Referenced by handle_client_evaluate(), and handle_client_listen().

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handle_client_listen()

static void handle_client_listen ( void *  cls, const struct GNUNET_SET_ListenMessage *  msg  )

static

Called when a client wants to create a new listener.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1208 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct GNUNET_MQ_MessageHandler cadet_handlers[] =
  { GNUNET_MQ_hd_var_size (incoming_msg,
                           GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST,
                           struct OperationRequestMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_ibf,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF,
                           struct IBFMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_elements,
                           GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS,
                           struct GNUNET_SET_ElementMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_offer,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OFFER,
                           struct GNUNET_MessageHeader,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_inquiry,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_INQUIRY,
                           struct InquiryMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_demand,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DEMAND,
                           struct GNUNET_MessageHeader,
                           NULL),
    GNUNET_MQ_hd_fixed_size (union_p2p_done,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE,
                             struct GNUNET_MessageHeader,
                             NULL),
    GNUNET_MQ_hd_fixed_size (union_p2p_over,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OVER,
                             struct GNUNET_MessageHeader,
                             NULL),
    GNUNET_MQ_hd_fixed_size (union_p2p_full_done,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_DONE,
                             struct GNUNET_MessageHeader,
                             NULL),
    GNUNET_MQ_hd_fixed_size (union_p2p_request_full,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_REQUEST_FULL,
                             struct GNUNET_MessageHeader,
                             NULL),
    GNUNET_MQ_hd_var_size (union_p2p_strata_estimator,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE,
                           struct StrataEstimatorMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_strata_estimator,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SEC,
                           struct StrataEstimatorMessage,
                           NULL),
    GNUNET_MQ_hd_var_size (union_p2p_full_element,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_ELEMENT,
                           struct GNUNET_SET_ElementMessage,
                           NULL),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_element_info,
                             GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO,
                             struct IntersectionElementInfoMessage,
                             NULL),
    GNUNET_MQ_hd_var_size (intersection_p2p_bf,
                           GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF,
                           struct BFMessage,
                           NULL),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_done,
                             GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE,
                             struct IntersectionDoneMessage,
                             NULL),
    GNUNET_MQ_handler_end () };
  struct Listener *listener;
 
  if (NULL != cs->listener)
  {
    /* max. one active listener per client! */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  listener = GNUNET_new (struct Listener);
  listener->cs = cs;
  cs->listener = listener;
  listener->app_id = msg->app_id;
  listener->operation = (enum GNUNET_SET_OperationType) ntohl (msg->operation);
  GNUNET_CONTAINER_DLL_insert (listener_head, listener_tail, listener);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "New listener created (op %u, port %s)\n",
              listener->operation,
              GNUNET_h2s (&listener->app_id));
  listener->open_port = GNUNET_CADET_open_port (cadet,
                                                &msg->app_id,
                                                &channel_new_cb,
                                                listener,
                                                &channel_window_cb,
                                                &channel_end_cb,
                                                cadet_handlers);
  GNUNET_SERVICE_client_continue (cs->client);
}

References Listener::app_id, cadet, channel_end_cb(), channel_new_cb(), channel_window_cb(), ClientState::client, Listener::cs, GNUNET_break, GNUNET_CADET_open_port(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DEMAND, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_DONE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_ELEMENT, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_INQUIRY, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OFFER, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OVER, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_REQUEST_FULL, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SEC, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), ClientState::listener, listener_head, listener_tail, msg, Listener::open_port, and Listener::operation.

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handle_client_reject()

static void handle_client_reject ( void *  cls, const struct GNUNET_SET_RejectMessage *  msg  )

static

Called when the listening client rejects an operation request by another peer.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1315 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Operation *op;
 
  op = get_incoming (ntohl (msg->accept_reject_id));
  if (NULL == op)
  {
    /* no matching incoming operation for this reject;
       could be that the other peer already disconnected... */
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Client rejected unknown operation %u\n",
                (unsigned int) ntohl (msg->accept_reject_id));
    GNUNET_SERVICE_client_continue (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Peer request (op %u, app %s) rejected by client\n",
              op->listener->operation,
              GNUNET_h2s (&cs->listener->app_id));
  _GSS_operation_destroy2 (op);
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_operation_destroy2(), Listener::app_id, ClientState::client, get_incoming(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_h2s(), GNUNET_log, GNUNET_SERVICE_client_continue(), ClientState::listener, msg, and op.

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check_client_mutation()

static int check_client_mutation ( void *  cls, const struct GNUNET_SET_ElementMessage *  msg  )

static

Called when a client wants to add or remove an element to a set it inhabits.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1347 of file gnunet-service-set.c.

{
  /* NOTE: Technically, we should probably check with the
     block library whether the element we are given is well-formed */
  return GNUNET_OK;
}

References GNUNET_OK.

handle_client_mutation()

static void handle_client_mutation ( void *  cls, const struct GNUNET_SET_ElementMessage *  msg  )

static

Called when a client wants to add or remove an element to a set it inhabits.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1362 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested an operation */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_SERVICE_client_continue (cs->client);
 
  if (0 != set->content->iterator_count)
  {
    struct PendingMutation *pm;
 
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Scheduling mutation on set\n");
    pm = GNUNET_new (struct PendingMutation);
    pm->msg =
      (struct GNUNET_SET_ElementMessage *) GNUNET_copy_message (&msg->header);
    pm->set = set;
    GNUNET_CONTAINER_DLL_insert_tail (set->content->pending_mutations_head,
                                      set->content->pending_mutations_tail,
                                      pm);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Executing mutation on set\n");
  execute_mutation (set, msg);
}

References ClientState::client, Set::content, Set::cs, execute_mutation(), GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_copy_message(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), SetContent::iterator_count, msg, SetContent::pending_mutations_head, SetContent::pending_mutations_tail, pm, and ClientState::set.

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advance_generation()

static void advance_generation ( struct Set *  set )

static

Advance the current generation of a set, adding exclusion ranges if necessary.

Parameters

set	the set where we want to advance the generation

Definition at line 1402 of file gnunet-service-set.c.

{
  struct GenerationRange r;
 
  if (set->current_generation == set->content->latest_generation)
  {
    set->content->latest_generation++;
    set->current_generation++;
    return;
  }
 
  GNUNET_assert (set->current_generation < set->content->latest_generation);
 
  r.start = set->current_generation + 1;
  r.end = set->content->latest_generation + 1;
  set->content->latest_generation = r.end;
  set->current_generation = r.end;
  GNUNET_array_append (set->excluded_generations,
                       set->excluded_generations_size,
                       r);
}

References Set::content, Set::current_generation, GenerationRange::end, Set::excluded_generations, Set::excluded_generations_size, GNUNET_array_append, GNUNET_assert, SetContent::latest_generation, and GenerationRange::start.

Referenced by handle_client_accept(), handle_client_copy_lazy_connect(), and handle_client_evaluate().

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check_client_evaluate()

static int check_client_evaluate ( void *  cls, const struct GNUNET_SET_EvaluateMessage *  msg  )

static

Called when a client wants to initiate a set operation with another peer.

Initiates the CADET connection to the listener and sends the request.

Parameters

cls	client that sent the message
msg	message sent by the client

Returns

GNUNET_OK if the message is well-formed

Definition at line 1435 of file gnunet-service-set.c.

{
  /* FIXME: suboptimal, even if the context below could be NULL,
     there are malformed messages this does not check for... */
  return GNUNET_OK;
}

References GNUNET_OK.

handle_client_evaluate()

static void handle_client_evaluate ( void *  cls, const struct GNUNET_SET_EvaluateMessage *  msg  )

static

Called when a client wants to initiate a set operation with another peer.

Initiates the CADET connection to the listener and sends the request.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1452 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Operation *op = GNUNET_new (struct Operation);
  const struct GNUNET_MQ_MessageHandler cadet_handlers[] =
  { GNUNET_MQ_hd_var_size (incoming_msg,
                           GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST,
                           struct OperationRequestMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_ibf,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF,
                           struct IBFMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_elements,
                           GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS,
                           struct GNUNET_SET_ElementMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_offer,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OFFER,
                           struct GNUNET_MessageHeader,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_inquiry,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_INQUIRY,
                           struct InquiryMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_demand,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DEMAND,
                           struct GNUNET_MessageHeader,
                           op),
    GNUNET_MQ_hd_fixed_size (union_p2p_done,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE,
                             struct GNUNET_MessageHeader,
                             op),
    GNUNET_MQ_hd_fixed_size (union_p2p_over,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OVER,
                             struct GNUNET_MessageHeader,
                             op),
    GNUNET_MQ_hd_fixed_size (union_p2p_full_done,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_DONE,
                             struct GNUNET_MessageHeader,
                             op),
    GNUNET_MQ_hd_fixed_size (union_p2p_request_full,
                             GNUNET_MESSAGE_TYPE_SET_UNION_P2P_REQUEST_FULL,
                             struct GNUNET_MessageHeader,
                             op),
    GNUNET_MQ_hd_var_size (union_p2p_strata_estimator,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE,
                           struct StrataEstimatorMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_strata_estimator,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SEC,
                           struct StrataEstimatorMessage,
                           op),
    GNUNET_MQ_hd_var_size (union_p2p_full_element,
                           GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_ELEMENT,
                           struct GNUNET_SET_ElementMessage,
                           op),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_element_info,
                             GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO,
                             struct IntersectionElementInfoMessage,
                             op),
    GNUNET_MQ_hd_var_size (intersection_p2p_bf,
                           GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF,
                           struct BFMessage,
                           op),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_done,
                             GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE,
                             struct IntersectionDoneMessage,
                             op),
    GNUNET_MQ_handler_end () };
  struct Set *set;
  const struct GNUNET_MessageHeader *context;
 
  if (NULL == (set = cs->set))
  {
    GNUNET_break (0);
    GNUNET_free (op);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  op->salt = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
  op->peer = msg->target_peer;
  op->result_mode = ntohl (msg->result_mode);
  op->client_request_id = ntohl (msg->request_id);
  op->byzantine = msg->byzantine;
  op->byzantine_lower_bound = msg->byzantine_lower_bound;
  op->force_full = msg->force_full;
  op->force_delta = msg->force_delta;
  context = GNUNET_MQ_extract_nested_mh (msg);
 
  /* Advance generation values, so that
     mutations won't interfer with the running operation. */
  op->set = set;
  op->generation_created = set->current_generation;
  advance_generation (set);
  GNUNET_CONTAINER_DLL_insert (set->ops_head, set->ops_tail, op);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Creating new CADET channel to port %s for set operation type %u\n",
              GNUNET_h2s (&msg->app_id),
              set->operation);
  op->channel = GNUNET_CADET_channel_create (cadet,
                                             op,
                                             &msg->target_peer,
                                             &msg->app_id,
                                             &channel_window_cb,
                                             &channel_end_cb,
                                             cadet_handlers);
  op->mq = GNUNET_CADET_get_mq (op->channel);
  op->state = set->vt->evaluate (op, context);
  if (NULL == op->state)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_SERVICE_client_continue (cs->client);
}

References advance_generation(), cadet, channel_end_cb(), channel_window_cb(), ClientState::client, context, Set::current_generation, SetVT::evaluate, GNUNET_break, GNUNET_CADET_channel_create(), GNUNET_CADET_get_mq(), GNUNET_CONTAINER_DLL_insert, GNUNET_CRYPTO_QUALITY_NONCE, GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_BF, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_DONE, GNUNET_MESSAGE_TYPE_SET_INTERSECTION_P2P_ELEMENT_INFO, GNUNET_MESSAGE_TYPE_SET_P2P_ELEMENTS, GNUNET_MESSAGE_TYPE_SET_P2P_OPERATION_REQUEST, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DEMAND, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_DONE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_DONE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_FULL_ELEMENT, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_IBF, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_INQUIRY, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OFFER, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_OVER, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_REQUEST_FULL, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SE, GNUNET_MESSAGE_TYPE_SET_UNION_P2P_SEC, GNUNET_MQ_extract_nested_mh, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), msg, op, Set::operation, Set::ops_head, Set::ops_tail, ClientState::set, and Set::vt.

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handle_client_iter_ack()

static void handle_client_iter_ack ( void *  cls, const struct GNUNET_SET_IterAckMessage *  ack  )

static

Handle an ack from a client, and send the next element.

Note that we only expect acks for set elements, not after the GNUNET_MESSAGE_TYPE_SET_ITER_DONE message.

Parameters

cls	client the client
ack	the message

Definition at line 1580 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set acknowledged receiving a value */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  if (NULL == set->iter)
  {
    /* client sent an ack, but we were not expecting one (as
       set iteration has finished) */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_SERVICE_client_continue (cs->client);
  if (ntohl (ack->send_more))
  {
    send_client_element (set);
  }
  else
  {
    GNUNET_CONTAINER_multihashmap_iterator_destroy (set->iter);
    set->iter = NULL;
    set->iteration_id++;
  }
}

References ClientState::client, Set::cs, GNUNET_break, GNUNET_CONTAINER_multihashmap_iterator_destroy(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), Set::iter, Set::iteration_id, send_client_element(), GNUNET_SET_IterAckMessage::send_more, and ClientState::set.

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handle_client_copy_lazy_prepare()

static void handle_client_copy_lazy_prepare ( void *  cls, const struct GNUNET_MessageHeader *  mh  )

static

Handle a request from the client to copy a set.

Parameters

cls	the client
mh	the message

Definition at line 1621 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct LazyCopyRequest *cr;
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SET_CopyLazyResponseMessage *resp_msg;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested an operation */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client requested creation of lazy copy\n");
  cr = GNUNET_new (struct LazyCopyRequest);
  cr->cookie = ++lazy_copy_cookie;
  cr->source_set = set;
  GNUNET_CONTAINER_DLL_insert (lazy_copy_head, lazy_copy_tail, cr);
  ev = GNUNET_MQ_msg (resp_msg, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_RESPONSE);
  resp_msg->cookie = cr->cookie;
  GNUNET_MQ_send (set->cs->mq, ev);
  GNUNET_SERVICE_client_continue (cs->client);
}

References ClientState::client, LazyCopyRequest::cookie, GNUNET_SET_CopyLazyResponseMessage::cookie, Set::cs, GNUNET_break, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_RESPONSE, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), lazy_copy_cookie, lazy_copy_head, lazy_copy_tail, ClientState::mq, ClientState::set, and LazyCopyRequest::source_set.

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handle_client_copy_lazy_connect()

static void handle_client_copy_lazy_connect ( void *  cls, const struct GNUNET_SET_CopyLazyConnectMessage *  msg  )

static

Handle a request from the client to connect to a copy of a set.

Parameters

cls	the client
msg	the message

Definition at line 1657 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct LazyCopyRequest *cr;
  struct Set *set;
  int found;
 
  if (NULL != cs->set)
  {
    /* There can only be one set per client */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  found = GNUNET_NO;
  for (cr = lazy_copy_head; NULL != cr; cr = cr->next)
  {
    if (cr->cookie == msg->cookie)
    {
      found = GNUNET_YES;
      break;
    }
  }
  if (GNUNET_NO == found)
  {
    /* client asked for copy with cookie we don't know */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_CONTAINER_DLL_remove (lazy_copy_head, lazy_copy_tail, cr);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client %p requested use of lazy copy\n",
              cs);
  set = GNUNET_new (struct Set);
  switch (cr->source_set->operation)
  {
  case GNUNET_SET_OPERATION_INTERSECTION:
    set->vt = _GSS_intersection_vt ();
    break;
 
  case GNUNET_SET_OPERATION_UNION:
    set->vt = _GSS_union_vt ();
    break;
 
  default:
    GNUNET_assert (0);
    return;
  }
 
  if (NULL == set->vt->copy_state)
  {
    /* Lazy copy not supported for this set operation */
    GNUNET_break (0);
    GNUNET_free (set);
    GNUNET_free (cr);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
 
  set->operation = cr->source_set->operation;
  set->state = set->vt->copy_state (cr->source_set->state);
  set->content = cr->source_set->content;
  set->content->refcount++;
 
  set->current_generation = cr->source_set->current_generation;
  set->excluded_generations_size = cr->source_set->excluded_generations_size;
  set->excluded_generations =
    GNUNET_memdup (cr->source_set->excluded_generations,
                   set->excluded_generations_size
                   * sizeof(struct GenerationRange));
 
  /* Advance the generation of the new set, so that mutations to the
     of the cloned set and the source set are independent. */
  advance_generation (set);
  set->cs = cs;
  cs->set = set;
  GNUNET_free (cr);
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_intersection_vt(), _GSS_union_vt(), advance_generation(), ClientState::client, Set::content, LazyCopyRequest::cookie, SetVT::copy_state, Set::cs, Set::current_generation, Set::excluded_generations, Set::excluded_generations_size, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_memdup, GNUNET_new, GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SET_OPERATION_INTERSECTION, GNUNET_SET_OPERATION_UNION, GNUNET_YES, lazy_copy_head, lazy_copy_tail, msg, LazyCopyRequest::next, Set::operation, SetContent::refcount, ClientState::set, LazyCopyRequest::source_set, Set::state, and Set::vt.

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handle_client_cancel()

static void handle_client_cancel ( void *  cls, const struct GNUNET_SET_CancelMessage *  msg  )

static

Handle a request from the client to cancel a running set operation.

Parameters

cls	the client
msg	the message

Definition at line 1748 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct Operation *op;
  int found;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested an operation */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  found = GNUNET_NO;
  for (op = set->ops_head; NULL != op; op = op->next)
  {
    if (op->client_request_id == ntohl (msg->request_id))
    {
      found = GNUNET_YES;
      break;
    }
  }
  if (GNUNET_NO == found)
  {
    /* It may happen that the operation was already destroyed due to
     * the other peer disconnecting.  The client may not know about this
     * yet and try to cancel the (just barely non-existent) operation.
     * So this is not a hard error.
     */GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Client canceled non-existent op %u\n",
                (uint32_t) ntohl (msg->request_id));
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client requested cancel for op %u\n",
                (uint32_t) ntohl (msg->request_id));
    _GSS_operation_destroy (op, GNUNET_YES);
  }
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_operation_destroy(), ClientState::client, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_YES, msg, GNUNET_ARM_Operation::next, op, Set::ops_head, ClientState::set, and Operation::set.

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handle_client_accept()

static void handle_client_accept ( void *  cls, const struct GNUNET_SET_AcceptMessage *  msg  )

static

Handle a request from the client to accept a set operation that came from a remote peer.

We forward the accept to the associated operation for handling

Parameters

cls	the client
msg	the message

Definition at line 1801 of file gnunet-service-set.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct Operation *op;
  struct GNUNET_SET_ResultMessage *result_message;
  struct GNUNET_MQ_Envelope *ev;
  struct Listener *listener;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested to accept */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  op = get_incoming (ntohl (msg->accept_reject_id));
  if (NULL == op)
  {
    /* It is not an error if the set op does not exist -- it may
    * have been destroyed when the partner peer disconnected. */
    GNUNET_log (
      GNUNET_ERROR_TYPE_INFO,
      "Client %p accepted request %u of listener %p that is no longer active\n",
      cs,
      ntohl (msg->accept_reject_id),
      cs->listener);
    ev = GNUNET_MQ_msg (result_message, GNUNET_MESSAGE_TYPE_SET_RESULT);
    result_message->request_id = msg->request_id;
    result_message->result_status = htons (GNUNET_SET_STATUS_FAILURE);
    GNUNET_MQ_send (set->cs->mq, ev);
    GNUNET_SERVICE_client_continue (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client accepting request %u\n",
              (uint32_t) ntohl (msg->accept_reject_id));
  listener = op->listener;
  op->listener = NULL;
  GNUNET_CONTAINER_DLL_remove (listener->op_head, listener->op_tail, op);
  op->set = set;
  GNUNET_CONTAINER_DLL_insert (set->ops_head, set->ops_tail, op);
  op->client_request_id = ntohl (msg->request_id);
  op->result_mode = ntohl (msg->result_mode);
  op->byzantine = msg->byzantine;
  op->byzantine_lower_bound = msg->byzantine_lower_bound;
  op->force_full = msg->force_full;
  op->force_delta = msg->force_delta;
 
  /* Advance generation values, so that future mutations do not
     interfer with the running operation. */
  op->generation_created = set->current_generation;
  advance_generation (set);
  GNUNET_assert (NULL == op->state);
  op->state = set->vt->accept (op);
  if (NULL == op->state)
  {
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  /* Now allow CADET to continue, as we did not do this in
   #handle_incoming_msg (as we wanted to first see if the
     local client would accept the request). */
  GNUNET_CADET_receive_done (op->channel);
  GNUNET_SERVICE_client_continue (cs->client);
}

References SetVT::accept, advance_generation(), ClientState::client, Listener::cs, Set::cs, Set::current_generation, get_incoming(), GNUNET_assert, GNUNET_break, GNUNET_CADET_receive_done(), GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_MESSAGE_TYPE_SET_RESULT, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SET_STATUS_FAILURE, ClientState::listener, ClientState::mq, msg, op, Listener::op_head, Listener::op_tail, Set::ops_head, Set::ops_tail, GNUNET_SET_ResultMessage::request_id, GNUNET_SET_ResultMessage::result_status, ClientState::set, and Set::vt.

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shutdown_task()

static void shutdown_task ( void *  cls )

static

Called to clean up, after a shutdown has been requested.

Parameters

cls	closure, NULL

Definition at line 1876 of file gnunet-service-set.c.

{
  /* Delay actual shutdown to allow service to disconnect clients */
  in_shutdown = GNUNET_YES;
  if (0 == num_clients)
  {
    if (NULL != cadet)
    {
      GNUNET_CADET_disconnect (cadet);
      cadet = NULL;
    }
  }
  GNUNET_STATISTICS_destroy (_GSS_statistics, GNUNET_YES);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "handled shutdown request\n");
}

References _GSS_statistics, cadet, GNUNET_CADET_disconnect(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_STATISTICS_destroy(), GNUNET_YES, in_shutdown, and num_clients.

Referenced by run().

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run()

static void run ( void *  cls, const struct GNUNET_CONFIGURATION_Handle *  cfg, struct GNUNET_SERVICE_Handle *  service  )

static

Function called by the service's run method to run service-specific setup code.

Parameters

cls	closure
cfg	configuration to use
service	the initialized service

Definition at line 1902 of file gnunet-service-set.c.

{
  /* FIXME: need to modify SERVICE (!) API to allow
     us to run a shutdown task *after* clients were
     forcefully disconnected! */
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
  _GSS_statistics = GNUNET_STATISTICS_create ("set", cfg);
  cadet = GNUNET_CADET_connect (cfg);
  if (NULL == cadet)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Could not connect to CADET service\n"));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
}

References _, _GSS_statistics, cadet, cfg, GNUNET_CADET_connect(), GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), and shutdown_task().

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GNUNET_SERVICE_MAIN()

GNUNET_SERVICE_MAIN	(	"set"	,
		GNUNET_SERVICE_OPTION_NONE	,
		&	run,
		&	client_connect_cb,
		&	client_disconnect_cb,
		NULL	,
		GNUNET_MQ_hd_fixed_size(client_accept, GNUNET_MESSAGE_TYPE_SET_ACCEPT, struct GNUNET_SET_AcceptMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_iter_ack, GNUNET_MESSAGE_TYPE_SET_ITER_ACK, struct GNUNET_SET_IterAckMessage, NULL)	,
		GNUNET_MQ_hd_var_size(client_mutation, GNUNET_MESSAGE_TYPE_SET_ADD, struct GNUNET_SET_ElementMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_create_set, GNUNET_MESSAGE_TYPE_SET_CREATE, struct GNUNET_SET_CreateMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_iterate, GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST, struct GNUNET_MessageHeader, NULL)	,
		GNUNET_MQ_hd_var_size(client_evaluate, GNUNET_MESSAGE_TYPE_SET_EVALUATE, struct GNUNET_SET_EvaluateMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_listen, GNUNET_MESSAGE_TYPE_SET_LISTEN, struct GNUNET_SET_ListenMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_reject, GNUNET_MESSAGE_TYPE_SET_REJECT, struct GNUNET_SET_RejectMessage, NULL)	,
		GNUNET_MQ_hd_var_size(client_mutation, GNUNET_MESSAGE_TYPE_SET_REMOVE, struct GNUNET_SET_ElementMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_cancel, GNUNET_MESSAGE_TYPE_SET_CANCEL, struct GNUNET_SET_CancelMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_copy_lazy_prepare, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_PREPARE, struct GNUNET_MessageHeader, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_copy_lazy_connect, GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_CONNECT, struct GNUNET_SET_CopyLazyConnectMessage, NULL)	,
		GNUNET_MQ_handler_end()
	)

Define "main" method using service macro.

Variable Documentation

cadet

struct GNUNET_CADET_Handle* cadet

static

Handle to the cadet service, used to listen for and connect to remote peers.

Definition at line 125 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), handle_client_evaluate(), handle_client_listen(), run(), and shutdown_task().

lazy_copy_head

struct LazyCopyRequest* lazy_copy_head

static

DLL of lazy copy requests by this client.

Definition at line 130 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), handle_client_copy_lazy_connect(), and handle_client_copy_lazy_prepare().

lazy_copy_tail

struct LazyCopyRequest* lazy_copy_tail

static

DLL of lazy copy requests by this client.

Definition at line 135 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), handle_client_copy_lazy_connect(), and handle_client_copy_lazy_prepare().

lazy_copy_cookie

uint32_t lazy_copy_cookie

static

Generator for unique cookie we set per lazy copy request.

Definition at line 140 of file gnunet-service-set.c.

Referenced by handle_client_copy_lazy_prepare().

_GSS_statistics

struct GNUNET_STATISTICS_Handle* _GSS_statistics

Statistics handle.

Definition at line 145 of file gnunet-service-set.c.

Referenced by decode_and_send(), fail_intersection_operation(), handle_union_p2p_demand(), handle_union_p2p_elements(), handle_union_p2p_full_element(), handle_union_p2p_strata_estimator(), run(), send_bloomfilter(), send_client_done(), send_client_done_and_destroy(), send_client_removed_element(), send_ibf(), shutdown_task(), union_accept(), and union_evaluate().

listener_head

struct Listener* listener_head

static

Listeners are held in a doubly linked list.

Definition at line 150 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), get_incoming(), and handle_client_listen().

listener_tail

struct Listener* listener_tail

static

Listeners are held in a doubly linked list.

Definition at line 155 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), and handle_client_listen().

num_clients

unsigned int num_clients

static

Number of active clients.

Definition at line 160 of file gnunet-service-set.c.

Referenced by client_connect_cb(), client_disconnect_cb(), and shutdown_task().

in_shutdown

int in_shutdown

static

Are we in shutdown? if GNUNET_YES and the number of clients drops to zero, disconnect from CADET.

Definition at line 166 of file gnunet-service-set.c.

Referenced by client_disconnect_cb(), and shutdown_task().

suggest_id

uint32_t suggest_id

static

Counter for allocating unique IDs for clients, used to identify incoming operation requests from remote peers, that the client can choose to accept or refuse.

0 must not be used (reserved for uninitialized).

Definition at line 174 of file gnunet-service-set.c.

Referenced by handle_incoming_msg().