regex_api_search.c File Reference

access regex service to discover peers using matching strings More...

#include "platform.h"
#include "gnunet_protocols.h"
#include "gnunet_util_lib.h"
#include "gnunet_regex_service.h"
#include "regex_ipc.h"

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Data Structures
struct	GNUNET_REGEX_Search
	Handle to store data about a regex search. More...

Macros
#define	LOG(kind, ...)   GNUNET_log_from (kind, "regex-api", __VA_ARGS__)

Functions
static void	search_reconnect (struct GNUNET_REGEX_Search *s)
	(Re)connect to the REGEX service for the given search s.
static int	check_search_response (void *cls, const struct ResultMessage *result)
	We got a response or disconnect after asking regex to do the search.
static void	handle_search_response (void *cls, const struct ResultMessage *result)
	We got a response or disconnect after asking regex to do the search.
static void	mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
	We got a disconnect after asking regex to do the announcement.
struct GNUNET_REGEX_Search *	GNUNET_REGEX_search (const struct GNUNET_CONFIGURATION_Handle *cfg, const char *string, GNUNET_REGEX_Found callback, void *callback_cls)
	Search for a peer offering a regex matching certain string in the DHT.
void	GNUNET_REGEX_search_cancel (struct GNUNET_REGEX_Search *s)
	Stop search and free all data used by a GNUNET_REGEX_search call.

Detailed Description

access regex service to discover peers using matching strings

Author

Maximilian Szengel

Christian Grothoff

Definition in file regex_api_search.c.

Macro Definition Documentation

LOG

#define LOG	(		kind,
			...
	)		GNUNET_log_from (kind, "regex-api", __VA_ARGS__)

Definition at line 33 of file regex_api_search.c.

Function Documentation

search_reconnect()

static void search_reconnect ( struct GNUNET_REGEX_Search *  s )

static

(Re)connect to the REGEX service for the given search s.

Parameters

s	context for the search search for

Definition at line 156 of file regex_api_search.c.

{
  struct GNUNET_MQ_MessageHandler handlers[] = {
    GNUNET_MQ_hd_var_size (search_response,
                           GNUNET_MESSAGE_TYPE_REGEX_RESULT,
                           struct ResultMessage,
                           s),
    GNUNET_MQ_handler_end ()
  };
  size_t slen = strlen (s->string) + 1;
  struct GNUNET_MQ_Envelope *env;
  struct RegexSearchMessage *rsm;
 
  GNUNET_assert (NULL == s->mq);
  s->mq = GNUNET_CLIENT_connect (s->cfg,
                                 "regex",
                                 handlers,
                                 &mq_error_handler,
                                 s);
  if (NULL == s->mq)
    return;
  env = GNUNET_MQ_msg_extra (rsm,
                             slen,
                             GNUNET_MESSAGE_TYPE_REGEX_SEARCH);
  GNUNET_memcpy (&rsm[1],
                 s->string,
                 slen);
  GNUNET_MQ_send (s->mq,
                  env);
}

References GNUNET_REGEX_Search::cfg, env, GNUNET_assert, GNUNET_CLIENT_connect(), GNUNET_memcpy, GNUNET_MESSAGE_TYPE_REGEX_RESULT, GNUNET_MESSAGE_TYPE_REGEX_SEARCH, GNUNET_MQ_handler_end, GNUNET_MQ_hd_var_size, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), handlers, GNUNET_REGEX_Search::mq, mq_error_handler(), and GNUNET_REGEX_Search::string.

Referenced by GNUNET_REGEX_search(), and mq_error_handler().

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check_search_response()

static int check_search_response ( void *  cls, const struct ResultMessage *  result  )

static

We got a response or disconnect after asking regex to do the search.

Check it is well-formed.

Parameters

cls	the struct GNUNET_REGEX_Search to handle reply for
result	the message

Returns

GNUNET_SYSERR if rm is not well-formed.

Definition at line 86 of file regex_api_search.c.

{
  uint16_t size = ntohs (result->header.size) - sizeof(*result);
  uint16_t gpl = ntohs (result->get_path_length);
  uint16_t ppl = ntohs (result->put_path_length);
 
  if (size != (gpl + ppl) * sizeof(struct GNUNET_PeerIdentity))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References GNUNET_break, GNUNET_OK, GNUNET_SYSERR, result, and size.

handle_search_response()

static void handle_search_response ( void *  cls, const struct ResultMessage *  result  )

static

We got a response or disconnect after asking regex to do the search.

Handle it.

Parameters

cls	the struct GNUNET_REGEX_Search to handle reply for
result	the message

Definition at line 110 of file regex_api_search.c.

{
  struct GNUNET_REGEX_Search *s = cls;
  uint16_t gpl = ntohs (result->get_path_length);
  uint16_t ppl = ntohs (result->put_path_length);
  const struct GNUNET_PeerIdentity *pid;
 
  pid = &result->id;
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Got regex result %s\n",
       GNUNET_i2s (pid));
  s->callback (s->callback_cls,
               pid,
               &pid[1],
               gpl,
               &pid[1 + gpl],
               ppl);
}

References GNUNET_REGEX_Search::callback, GNUNET_REGEX_Search::callback_cls, GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), LOG, pid, and result.

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mq_error_handler()

static void mq_error_handler ( void *  cls, enum GNUNET_MQ_Error  error  )

static

We got a disconnect after asking regex to do the announcement.

Retry.

Parameters

cls	the struct GNUNET_REGEX_Search to retry
error	error code

Definition at line 139 of file regex_api_search.c.

{
  struct GNUNET_REGEX_Search *s = cls;
 
  GNUNET_MQ_destroy (s->mq);
  s->mq = NULL;
  search_reconnect (s);
}

References GNUNET_MQ_destroy(), GNUNET_REGEX_Search::mq, and search_reconnect().

Referenced by search_reconnect().

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