postgres for an implementation of a database backend for the datacache More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_pq_lib.h"
#include "gnunet_datacache_plugin.h"

Include dependency graph for plugin_datacache_postgres.c:

Data Structures
struct	Plugin
	Handle for a plugin. More...

struct	HandleResultContext
	Closure for handle_results. More...

struct	ExtractResultContext
	Closure for extract_result_cb. More...

Macros
#define	LOG(kind, ...) GNUNET_log_from (kind, "datacache-postgres", __VA_ARGS__)

#define	OVERHEAD (sizeof(struct GNUNET_HashCode) + 24)
	Per-entry overhead estimate.

Functions
static enum GNUNET_GenericReturnValue	init_connection (struct Plugin *plugin)
	Get a database handle.

static ssize_t	postgres_plugin_put (void cls, uint32_t prox, const struct GNUNET_DATACACHE_Block block)
	Store an item in the datastore.

static void	handle_results (void cls, PGresult result, unsigned int num_results)
	Function to be called with the results of a SELECT statement that has returned num_results results.

static unsigned int	postgres_plugin_get (void cls, const struct GNUNET_HashCode key, enum GNUNET_BLOCK_Type type, GNUNET_DATACACHE_Iterator iter, void *iter_cls)
	Iterate over the results for a particular key in the datastore.

static enum GNUNET_GenericReturnValue	postgres_plugin_del (void *cls)
	Delete the entry with the lowest expiration value from the datacache right now.

static void	extract_result_cb (void cls, PGresult result, unsigned int num_results)
	Function to be called with the results of a SELECT statement that has returned num_results results.

static unsigned int	postgres_plugin_get_closest (void cls, const struct GNUNET_HashCode key, enum GNUNET_BLOCK_Type type, unsigned int num_results, GNUNET_DATACACHE_Iterator iter, void *iter_cls)
	Iterate over the results that are "close" to a particular key in the datacache.

void *	libgnunet_plugin_datacache_postgres_init (void *cls)
	Entry point for the plugin.

void *	libgnunet_plugin_datacache_postgres_done (void *cls)
	Exit point from the plugin.

Detailed Description

postgres for an implementation of a database backend for the datacache

Author: Christian Grothoff

Definition in file plugin_datacache_postgres.c.

Macro Definition Documentation

◆ LOG

#define LOG	(	kind,
		...
	)	GNUNET_log_from (kind, "datacache-postgres", __VA_ARGS__)

Definition at line 31 of file plugin_datacache_postgres.c.

◆ OVERHEAD

#define OVERHEAD (sizeof(struct GNUNET_HashCode) + 24)

Per-entry overhead estimate.

Definition at line 36 of file plugin_datacache_postgres.c.

Function Documentation

◆ init_connection()

static enum GNUNET_GenericReturnValue init_connection ( struct Plugin * plugin )

static

Get a database handle.

Parameters

plugin global context

Returns: GNUNET_OK on success, GNUNET_SYSERR on error

Definition at line 67 of file plugin_datacache_postgres.c.

{
  struct GNUNET_PQ_PreparedStatement ps[] = {
    GNUNET_PQ_make_prepare ("getkt",
                            "SELECT expiration_time,type,ro,value,trunc,path"
                            " FROM datacache.gn180dc"
                            " WHERE key=$1 AND type=$2 AND expiration_time >= $3"),
    GNUNET_PQ_make_prepare ("getk",
                            "SELECT expiration_time,type,ro,value,trunc,path"
                            " FROM datacache.gn180dc"
                            " WHERE key=$1 AND expiration_time >= $2"),
    GNUNET_PQ_make_prepare ("getex",
                            "SELECT LENGTH(value) AS len,oid,key"
                            " FROM datacache.gn180dc"
                            " WHERE expiration_time < $1"
                            " ORDER BY expiration_time ASC LIMIT 1"),
    GNUNET_PQ_make_prepare ("getm",
                            "SELECT LENGTH(value) AS len,oid,key"
                            " FROM datacache.gn180dc"
                            " ORDER BY prox ASC, expiration_time ASC LIMIT 1"),
    GNUNET_PQ_make_prepare ("get_closest",
                            "(SELECT expiration_time,type,ro,value,trunc,path,key"
                            " FROM datacache.gn180dc"
                            " WHERE key >= $1"
                            "   AND expiration_time >= $2"
                            "   AND ( (type = $3) OR ( 0 = $3) )"
                            " ORDER BY key ASC"
                            " LIMIT $4)"
                            " UNION "
                            "(SELECT expiration_time,type,ro,value,trunc,path,key"
                            " FROM datacache.gn180dc"
                            " WHERE key <= $1"
                            "   AND expiration_time >= $2"
                            "   AND ( (type = $3) OR ( 0 = $3) )"
                            " ORDER BY key DESC"
                            " LIMIT $4)"),
    GNUNET_PQ_make_prepare ("delrow",
                            "DELETE FROM datacache.gn180dc"
                            " WHERE oid=$1"),
    GNUNET_PQ_make_prepare ("put",
                            "INSERT INTO datacache.gn180dc"
                            " (type, ro, prox, expiration_time, key, value, trunc, path) "
                            "VALUES ($1, $2, $3, $4, $5, $6, $7, $8)"),
    GNUNET_PQ_PREPARED_STATEMENT_END
  };
 
  plugin->dbh = GNUNET_PQ_connect_with_cfg (plugin->env->cfg,
                                            "datacache-postgres",
                                            "datacache-",
                                            NULL,
                                            ps);
  if (NULL == plugin->dbh)
    return GNUNET_SYSERR;
  return GNUNET_OK;
}

References GNUNET_OK, GNUNET_PQ_connect_with_cfg(), GNUNET_PQ_make_prepare(), GNUNET_PQ_PREPARED_STATEMENT_END, GNUNET_SYSERR, plugin, and ps.

Referenced by libgnunet_plugin_datacache_postgres_init().

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◆ postgres_plugin_put()

static ssize_t postgres_plugin_put	(	void *	cls,
		uint32_t	prox,
		const struct GNUNET_DATACACHE_Block *	block
	)

static

Store an item in the datastore.

Parameters

cls	closure (our `struct Plugin`)
prox	proximity of key to my PID
block	data to store

Returns: 0 if duplicate, -1 on error, number of bytes used otherwise

Definition at line 133 of file plugin_datacache_postgres.c.

{
  struct Plugin *plugin = cls;
  uint32_t type32 = (uint32_t) block->type;
  uint32_t ro32 = (uint32_t) block->type;
  struct GNUNET_PQ_QueryParam params[] = {
    GNUNET_PQ_query_param_uint32 (&type32),
    GNUNET_PQ_query_param_uint32 (&ro32),
    GNUNET_PQ_query_param_uint32 (&prox),
    GNUNET_PQ_query_param_absolute_time (&block->expiration_time),
    GNUNET_PQ_query_param_auto_from_type (&block->key),
    GNUNET_PQ_query_param_fixed_size (block->data,
                                      block->data_size),
    GNUNET_PQ_query_param_auto_from_type (&block->trunc_peer),
    (0 == block->put_path_length)
    ? GNUNET_PQ_query_param_null ()
    : GNUNET_PQ_query_param_fixed_size (
      block->put_path,
      block->put_path_length
      * sizeof(struct GNUNET_DHT_PathElement)),
    GNUNET_PQ_query_param_end
  };
  enum GNUNET_DB_QueryStatus ret;
 
  ret = GNUNET_PQ_eval_prepared_non_select (plugin->dbh,
                                            "put",
                                            params);
  if (0 > ret)
    return -1;
  plugin->num_items++;
  return block->data_size + OVERHEAD;
}

Referenced by libgnunet_plugin_datacache_postgres_init().

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◆ handle_results()

static void handle_results	(	void *	cls,
		PGresult *	result,
		unsigned int	num_results
	)

static

Function to be called with the results of a SELECT statement that has returned num_results results.

Parse the result and call the callback given in cls

Parameters

cls	closure of type `struct HandleResultContext`
result	the postgres result
num_results	the number of results in result

Definition at line 201 of file plugin_datacache_postgres.c.

{
  struct HandleResultContext *hrc = cls;
 
  for (unsigned int i = 0; i < num_results; i++)
  {
    uint32_t type32;
    uint32_t bro32;
    void *data;
    struct GNUNET_DATACACHE_Block block;
    void *path = NULL;
    size_t path_size = 0;
    struct GNUNET_PQ_ResultSpec rs[] = {
      GNUNET_PQ_result_spec_absolute_time ("expiration_time",
                                           &block.expiration_time),
      GNUNET_PQ_result_spec_uint32 ("type",
                                    &type32),
      GNUNET_PQ_result_spec_uint32 ("ro",
                                    &bro32),
      GNUNET_PQ_result_spec_variable_size ("value",
                                           &data,
                                           &block.data_size),
      GNUNET_PQ_result_spec_auto_from_type ("trunc",
                                            &block.trunc_peer),
      GNUNET_PQ_result_spec_allow_null (
        GNUNET_PQ_result_spec_variable_size ("path",
                                             &path,
                                             &path_size),
        NULL),
      GNUNET_PQ_result_spec_end
    };
 
    if (GNUNET_YES !=
        GNUNET_PQ_extract_result (result,
                                  rs,
                                  i))
    {
      GNUNET_break (0);
      return;
    }
    if (0 != (path_size % sizeof(struct GNUNET_DHT_PathElement)))
    {
      GNUNET_break (0);
      path_size = 0;
      path = NULL;
    }
    block.data = data;
    block.put_path = path;
    block.put_path_length
      = path_size / sizeof (struct GNUNET_DHT_PathElement);
    block.type = (enum GNUNET_BLOCK_Type) type32;
    block.ro = (enum GNUNET_DHT_RouteOption) bro32;
    block.key = *hrc->key;
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Found result of size %u bytes and type %u in database\n",
         (unsigned int) block.data_size,
         (unsigned int) block.type);
    if ( (NULL != hrc->iter) &&
         (GNUNET_SYSERR ==
          hrc->iter (hrc->iter_cls,
                     &block)) )
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Ending iteration (client error)\n");
      GNUNET_PQ_cleanup_result (rs);
      return;
    }
    GNUNET_PQ_cleanup_result (rs);
  }
}

Referenced by postgres_plugin_get().

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◆ postgres_plugin_get()

static unsigned int postgres_plugin_get	(	void *	cls,
		const struct GNUNET_HashCode *	key,
		enum GNUNET_BLOCK_Type	type,
		GNUNET_DATACACHE_Iterator	iter,
		void *	iter_cls
	)

static

Iterate over the results for a particular key in the datastore.

Parameters

cls	closure (our `struct Plugin`)
key	key to look for
type	entries of which type are relevant?
iter	maybe NULL (to just count)
iter_cls	closure for iter

Returns: the number of results found

Definition at line 287 of file plugin_datacache_postgres.c.

{
  struct Plugin *plugin = cls;
  uint32_t type32 = (uint32_t) type;
  struct GNUNET_TIME_Absolute now = { 0 };
  struct GNUNET_PQ_QueryParam paramk[] = {
    GNUNET_PQ_query_param_auto_from_type (key),
    GNUNET_PQ_query_param_absolute_time (&now),
    GNUNET_PQ_query_param_end
  };
  struct GNUNET_PQ_QueryParam paramkt[] = {
    GNUNET_PQ_query_param_auto_from_type (key),
    GNUNET_PQ_query_param_uint32 (&type32),
    GNUNET_PQ_query_param_absolute_time (&now),
    GNUNET_PQ_query_param_end
  };
  enum GNUNET_DB_QueryStatus res;
  struct HandleResultContext hr_ctx;
 
  now = GNUNET_TIME_absolute_get ();
  hr_ctx.iter = iter;
  hr_ctx.iter_cls = iter_cls;
  hr_ctx.key = key;
  res = GNUNET_PQ_eval_prepared_multi_select (plugin->dbh,
                                              (0 == type) ? "getk" : "getkt",
                                              (0 == type) ? paramk : paramkt,
                                              &handle_results,
                                              &hr_ctx);
  if (res < 0)
    return 0;
  return res;
}

References GNUNET_PQ_eval_prepared_multi_select(), GNUNET_PQ_query_param_absolute_time(), GNUNET_PQ_query_param_auto_from_type, GNUNET_PQ_query_param_end, GNUNET_PQ_query_param_uint32(), GNUNET_TIME_absolute_get(), handle_results(), HandleResultContext::iter, HandleResultContext::iter_cls, key, HandleResultContext::key, plugin, res, and type.

Referenced by libgnunet_plugin_datacache_postgres_init().

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◆ postgres_plugin_del()

static enum GNUNET_GenericReturnValue postgres_plugin_del ( void * cls )

static

Delete the entry with the lowest expiration value from the datacache right now.

Parameters

cls	closure (our `struct Plugin`)

Returns: GNUNET_OK on success, GNUNET_SYSERR on error

Definition at line 333 of file plugin_datacache_postgres.c.

{
  struct Plugin *plugin = cls;
  struct GNUNET_PQ_QueryParam pempty[] = {
    GNUNET_PQ_query_param_end
  };
  uint32_t size;
  uint64_t oid;
  struct GNUNET_HashCode key;
  struct GNUNET_PQ_ResultSpec rs[] = {
    GNUNET_PQ_result_spec_uint32 ("len",
                                  &size),
    GNUNET_PQ_result_spec_uint64 ("oid",
                                  &oid),
    GNUNET_PQ_result_spec_auto_from_type ("key",
                                          &key),
    GNUNET_PQ_result_spec_end
  };
  enum GNUNET_DB_QueryStatus res;
  struct GNUNET_TIME_Absolute now;
  now = GNUNET_TIME_absolute_get ();
  {
    struct GNUNET_PQ_QueryParam xparam[] = {
      GNUNET_PQ_query_param_absolute_time (&now),
      GNUNET_PQ_query_param_end
    };
 
    res = GNUNET_PQ_eval_prepared_singleton_select (plugin->dbh,
                                                    "getex",
                                                    xparam,
                                                    rs);
  }
  if (0 >= res)
    res = GNUNET_PQ_eval_prepared_singleton_select (plugin->dbh,
                                                    "getm",
                                                    pempty,
                                                    rs);
  if (0 > res)
    return GNUNET_SYSERR;
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == res)
  {
    /* no result */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Ending iteration (no more results)\n");
    return 0;
  }
  {
    struct GNUNET_PQ_QueryParam dparam[] = {
      GNUNET_PQ_query_param_uint64 (&oid),
      GNUNET_PQ_query_param_end
    };
    res = GNUNET_PQ_eval_prepared_non_select (plugin->dbh,
                                              "delrow",
                                              dparam);
  }
  if (0 > res)
  {
    GNUNET_PQ_cleanup_result (rs);
    return GNUNET_SYSERR;
  }
  plugin->num_items--;
  plugin->env->delete_notify (plugin->env->cls,
                              &key,
                              size + OVERHEAD);
  GNUNET_PQ_cleanup_result (rs);
  return GNUNET_OK;
}

References GNUNET_TESTING_PluginFunctions::cls, GNUNET_DB_STATUS_SUCCESS_NO_RESULTS, GNUNET_ERROR_TYPE_DEBUG, GNUNET_OK, GNUNET_PQ_cleanup_result(), GNUNET_PQ_eval_prepared_non_select(), GNUNET_PQ_eval_prepared_singleton_select(), GNUNET_PQ_query_param_absolute_time(), GNUNET_PQ_query_param_end, GNUNET_PQ_query_param_uint64(), GNUNET_PQ_result_spec_auto_from_type, GNUNET_PQ_result_spec_end, GNUNET_PQ_result_spec_uint32(), GNUNET_PQ_result_spec_uint64(), GNUNET_SYSERR, GNUNET_TIME_absolute_get(), key, LOG, oid, OVERHEAD, plugin, res, and size.

Referenced by libgnunet_plugin_datacache_postgres_init().

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◆ extract_result_cb()

static void extract_result_cb	(	void *	cls,
		PGresult *	result,
		unsigned int	num_results
	)

static

Function to be called with the results of a SELECT statement that has returned num_results results.

Calls the iter from cls for each result.

Parameters

cls	closure with the `struct ExtractResultContext`
result	the postgres result
num_results	the number of results in result

Definition at line 429 of file plugin_datacache_postgres.c.

{
  struct ExtractResultContext *erc = cls;
 
  if (NULL == erc->iter)
    return;
  for (unsigned int i = 0; i < num_results; i++)
  {
    uint32_t type32;
    uint32_t bro32;
    struct GNUNET_DATACACHE_Block block;
    void *data;
    void *path;
    size_t path_size;
    struct GNUNET_PQ_ResultSpec rs[] = {
      GNUNET_PQ_result_spec_absolute_time ("expiration_time",
                                           &block.expiration_time),
      GNUNET_PQ_result_spec_uint32 ("type",
                                    &type32),
      GNUNET_PQ_result_spec_uint32 ("ro",
                                    &bro32),
      GNUNET_PQ_result_spec_variable_size ("value",
                                           &data,
                                           &block.data_size),
      GNUNET_PQ_result_spec_auto_from_type ("trunc",
                                            &block.trunc_peer),
      GNUNET_PQ_result_spec_variable_size ("path",
                                           &path,
                                           &path_size),
      GNUNET_PQ_result_spec_auto_from_type ("key",
                                            &block.key),
      GNUNET_PQ_result_spec_end
    };
 
    if (GNUNET_YES !=
        GNUNET_PQ_extract_result (result,
                                  rs,
                                  i))
    {
      GNUNET_break (0);
      return;
    }
    if (0 != (path_size % sizeof(struct GNUNET_DHT_PathElement)))
    {
      GNUNET_break (0);
      path_size = 0;
      path = NULL;
    }
    block.type = (enum GNUNET_BLOCK_Type) type32;
    block.ro = (enum GNUNET_DHT_RouteOption) bro32;
    block.data = data;
    block.put_path = path;
    block.put_path_length = path_size / sizeof (struct GNUNET_DHT_PathElement);
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Found result of size %u bytes and type %u in database\n",
         (unsigned int) block.data_size,
         (unsigned int) block.type);
    if ( (NULL != erc->iter) &&
         (GNUNET_SYSERR ==
          erc->iter (erc->iter_cls,
                     &block)) )
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "Ending iteration (client error)\n");
      GNUNET_PQ_cleanup_result (rs);
      break;
    }
    GNUNET_PQ_cleanup_result (rs);
  }
}

Referenced by postgres_plugin_get_closest().

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◆ postgres_plugin_get_closest()

static unsigned int postgres_plugin_get_closest	(	void *	cls,
		const struct GNUNET_HashCode *	key,
		enum GNUNET_BLOCK_Type	type,
		unsigned int	num_results,
		GNUNET_DATACACHE_Iterator	iter,
		void *	iter_cls
	)

static

Iterate over the results that are "close" to a particular key in the datacache.

"close" is defined as numerically larger than key (when interpreted as a circular address space), with small distance.

Parameters

cls	closure (internal context for the plugin)
key	area of the keyspace to look into
type	desired block type for the replies
num_results	number of results that should be returned to iter
iter	maybe NULL (to just count)
iter_cls	closure for iter

Returns: the number of results found

Definition at line 518 of file plugin_datacache_postgres.c.

{
  struct Plugin *plugin = cls;
  uint32_t num_results32 = (uint32_t) num_results;
  uint32_t type32 = (uint32_t) type;
  struct GNUNET_TIME_Absolute now;
  enum GNUNET_DB_QueryStatus res;
  struct ExtractResultContext erc;
 
  erc.iter = iter;
  erc.iter_cls = iter_cls;
  now = GNUNET_TIME_absolute_get ();
  {
    struct GNUNET_PQ_QueryParam params[] = {
      GNUNET_PQ_query_param_auto_from_type (key),
      GNUNET_PQ_query_param_absolute_time (&now),
      GNUNET_PQ_query_param_uint32 (&type32),
      GNUNET_PQ_query_param_uint32 (&num_results32),
      GNUNET_PQ_query_param_end
    };
    res = GNUNET_PQ_eval_prepared_multi_select (plugin->dbh,
                                                "get_closest",
                                                params,
                                                &extract_result_cb,
                                                &erc);
  }
  if (0 > res)
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Ending iteration (postgres error)\n");
    return 0;
  }
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == res)
  {
    /* no result */
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Ending iteration (no more results)\n");
    return 0;
  }
  return res;
}

References extract_result_cb(), GNUNET_DB_STATUS_SUCCESS_NO_RESULTS, GNUNET_ERROR_TYPE_DEBUG, GNUNET_PQ_eval_prepared_multi_select(), GNUNET_PQ_query_param_absolute_time(), GNUNET_PQ_query_param_auto_from_type, GNUNET_PQ_query_param_end, GNUNET_PQ_query_param_uint32(), GNUNET_TIME_absolute_get(), ExtractResultContext::iter, ExtractResultContext::iter_cls, key, LOG, plugin, res, and type.

Referenced by libgnunet_plugin_datacache_postgres_init().

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◆ libgnunet_plugin_datacache_postgres_init()

void * libgnunet_plugin_datacache_postgres_init ( void * cls )

Entry point for the plugin.

Parameters

cls	closure (the `struct GNUNET_DATACACHE_PluginEnvironmnet`)

Returns: the plugin's closure (our struct Plugin)

Definition at line 576 of file plugin_datacache_postgres.c.

{
  struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
  struct GNUNET_DATACACHE_PluginFunctions *api;
  struct Plugin *plugin;
 
  plugin = GNUNET_new (struct Plugin);
  plugin->env = env;
 
  if (GNUNET_OK != init_connection (plugin))
  {
    GNUNET_free (plugin);
    return NULL;
  }
 
  api = GNUNET_new (struct GNUNET_DATACACHE_PluginFunctions);
  api->cls = plugin;
  api->get = &postgres_plugin_get;
  api->put = &postgres_plugin_put;
  api->del = &postgres_plugin_del;
  api->get_closest = &postgres_plugin_get_closest;
  LOG (GNUNET_ERROR_TYPE_INFO,
       "Postgres datacache running\n");
  return api;
}

References Plugin::api, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_DATACACHE_PluginEnvironment::cls, env, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_new, GNUNET_OK, init_connection(), LOG, plugin, postgres_plugin_del(), postgres_plugin_get(), postgres_plugin_get_closest(), and postgres_plugin_put().

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◆ libgnunet_plugin_datacache_postgres_done()

void * libgnunet_plugin_datacache_postgres_done ( void * cls )

Exit point from the plugin.

Parameters

cls	closure (our `struct Plugin`)

Returns: NULL

Definition at line 613 of file plugin_datacache_postgres.c.

{
  struct GNUNET_DATACACHE_PluginFunctions *api = cls;
  struct Plugin *plugin = api->cls;
 
  GNUNET_break (GNUNET_OK ==
                GNUNET_PQ_exec_sql (plugin->dbh,
                                    "datacache-drop"));
  GNUNET_PQ_disconnect (plugin->dbh);
  GNUNET_free (plugin);
  GNUNET_free (api);
  return NULL;
}

References Plugin::api, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_DATACACHE_PluginFunctions::cls, GNUNET_break, GNUNET_free, GNUNET_OK, GNUNET_PQ_disconnect(), GNUNET_PQ_exec_sql(), and plugin.

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Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ LOG

◆ OVERHEAD

Function Documentation

◆ init_connection()

◆ postgres_plugin_put()

◆ handle_results()

◆ postgres_plugin_get()

◆ postgres_plugin_del()

◆ extract_result_cb()

◆ postgres_plugin_get_closest()

◆ libgnunet_plugin_datacache_postgres_init()

◆ libgnunet_plugin_datacache_postgres_done()