plugin_datacache_sqlite.c File Reference

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

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_datacache_plugin.h"
#include "gnunet_sq_lib.h"
#include <sqlite3.h>

Include dependency graph for plugin_datacache_sqlite.c:

Go to the source code of this file.

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

Macros
#define	LOG(kind, ...)   GNUNET_log_from (kind, "datacache-sqlite", __VA_ARGS__)
#define	LOG_STRERROR_FILE(kind, op, fn)    GNUNET_log_from_strerror_file (kind, "datacache-sqlite", op, fn)
#define	OVERHEAD   (sizeof(struct GNUNET_HashCode) + 36)
	How much overhead do we assume per entry in the datacache? More...
#define	LOG_SQLITE(db, level, cmd)
	Log an error message at log-level level that indicates a failure of the command cmd with the error from the database db. More...
#define	SQLITE3_EXEC(db, cmd)
	Execute SQL statement. More...

Functions
static int	sq_prepare (sqlite3 *dbh, const char *zSql, sqlite3_stmt **ppStmt)
	Prepare a SQL statement. More...
static ssize_t	sqlite_plugin_put (void *cls, uint32_t xor_distance, const struct GNUNET_DATACACHE_Block *block)
	Store an item in the datastore. More...
static unsigned int	get_any (void *cls, const struct GNUNET_HashCode *key, GNUNET_DATACACHE_Iterator iter, void *iter_cls)
	Iterate over the results for a particular key in the datastore. More...
static unsigned int	get_typed (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. More...
static unsigned int	sqlite_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. More...
static enum GNUNET_GenericReturnValue	sqlite_plugin_del (void *cls)
	Delete the entry with the lowest expiration value from the datacache right now. More...
static unsigned int	sqlite_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. More...
void *	libgnunet_plugin_datacache_sqlite_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_datacache_sqlite_done (void *cls)
	Exit point from the plugin. More...

Detailed Description

sqlite for an implementation of a database backend for the datacache

Author

Christian Grothoff

Definition in file plugin_datacache_sqlite.c.

Macro Definition Documentation

LOG

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

Definition at line 32 of file plugin_datacache_sqlite.c.

LOG_STRERROR_FILE

#define LOG_STRERROR_FILE	(		kind,
			op,
			fn
	)		GNUNET_log_from_strerror_file (kind, "datacache-sqlite", op, fn)

Definition at line 34 of file plugin_datacache_sqlite.c.

OVERHEAD

#define OVERHEAD   (sizeof(struct GNUNET_HashCode) + 36)

How much overhead do we assume per entry in the datacache?

Definition at line 42 of file plugin_datacache_sqlite.c.

LOG_SQLITE

#define LOG_SQLITE	(		db,
			level,
			cmd
	)

Value:

  do                                                  \
  {                                                   \
    LOG (level,                                       \
         _ ("`%s' failed at %s:%d with error: %s\n"), \
         cmd,                                         \
         __FILE__,                                    \
         __LINE__,                                    \
         sqlite3_errmsg (db));                        \
  } while (0)

Log an error message at log-level level that indicates a failure of the command cmd with the error from the database db.

Parameters

db	database handle
level	log level
cmd	failed command

Definition at line 124 of file plugin_datacache_sqlite.c.

SQLITE3_EXEC

#define SQLITE3_EXEC	(		db,
			cmd
	)

Value:

  do                                                            \
  {                                                             \
    emsg = NULL;                                                \
    if (SQLITE_OK !=                                            \
        sqlite3_exec (db, cmd, NULL, NULL, &emsg))              \
    {                                                           \
      LOG (GNUNET_ERROR_TYPE_ERROR,                             \
           _ ("`%s' failed at %s:%d with error: %s\n"),         \
           "sqlite3_exec",                                      \
           __FILE__,                                            \
           __LINE__,                                            \
           emsg);                                               \
      sqlite3_free (emsg);                                      \
    }                                                           \
  } while (0)

Execute SQL statement.

Parameters

db	database handle
cmd	SQL command to execute

Definition at line 142 of file plugin_datacache_sqlite.c.

Function Documentation

sq_prepare()

static int sq_prepare ( sqlite3 *  dbh, const char *  zSql, sqlite3_stmt **  ppStmt  )

static

Prepare a SQL statement.

Parameters

	dbh	database handle
	zSql	SQL statement text
[out]	ppStmt	set to the prepared statement

Returns

0 on success

Definition at line 169 of file plugin_datacache_sqlite.c.

{ /* OUT: Statement handle */
  char *dummy;
 
  return sqlite3_prepare (dbh,
                          zSql,
                          strlen (zSql),
                          ppStmt,
                          (const char **) &dummy);
}

References dummy.

Referenced by libgnunet_plugin_datacache_sqlite_init().

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sqlite_plugin_put()

static ssize_t sqlite_plugin_put ( void *  cls, uint32_t  xor_distance, const struct GNUNET_DATACACHE_Block *  block  )

static

Store an item in the datastore.

Parameters

cls	closure (our struct Plugin)
xor_distance	how close is key to our PID?
block	data to store

Returns

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

Definition at line 192 of file plugin_datacache_sqlite.c.

{
  struct Plugin *plugin = cls;
  uint32_t type32 = (uint32_t) block->type;
  uint32_t ro32 = (uint32_t) block->ro;
  struct GNUNET_SQ_QueryParam params[] = {
    GNUNET_SQ_query_param_uint32 (&type32),
    GNUNET_SQ_query_param_uint32 (&ro32),
    GNUNET_SQ_query_param_absolute_time (&block->expiration_time),
    GNUNET_SQ_query_param_auto_from_type (&block->key),
    GNUNET_SQ_query_param_uint32 (&xor_distance),
    GNUNET_SQ_query_param_fixed_size (block->data,
                                      block->data_size),
    GNUNET_SQ_query_param_fixed_size (block->put_path,
                                      block->put_path_length
                                      * sizeof(struct GNUNET_DHT_PathElement)),
    GNUNET_SQ_query_param_auto_from_type (&block->trunc_peer),
    GNUNET_SQ_query_param_end
  };
 
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Processing PUT of %u bytes with key `%s' and expiration %s\n",
       (unsigned int) block->data_size,
       GNUNET_h2s (&block->key),
       GNUNET_STRINGS_relative_time_to_string (
         GNUNET_TIME_absolute_get_remaining (
           block->expiration_time),
         GNUNET_YES));
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->insert_stmt,
                      params))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite3_bind_xxx");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->insert_stmt);
    return -1;
  }
  if (SQLITE_DONE !=
      sqlite3_step (plugin->insert_stmt))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite3_step");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->insert_stmt);
    return -1;
  }
  plugin->num_items++;
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->insert_stmt);
  return block->data_size + OVERHEAD;
}

References GNUNET_DATACACHE_Block::data, GNUNET_DATACACHE_Block::data_size, GNUNET_DATACACHE_Block::expiration_time, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_h2s(), GNUNET_OK, GNUNET_SQ_bind(), GNUNET_SQ_query_param_absolute_time(), GNUNET_SQ_query_param_auto_from_type, GNUNET_SQ_query_param_end, GNUNET_SQ_query_param_fixed_size(), GNUNET_SQ_query_param_uint32(), GNUNET_SQ_reset(), GNUNET_STRINGS_relative_time_to_string(), GNUNET_TIME_absolute_get_remaining(), GNUNET_YES, GNUNET_DATACACHE_Block::key, LOG, LOG_SQLITE, OVERHEAD, plugin, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, and GNUNET_DATACACHE_Block::type.

Referenced by libgnunet_plugin_datacache_sqlite_init().

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get_any()

static unsigned int get_any ( void *  cls, const struct GNUNET_HashCode *  key, 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
iter	maybe NULL (to just count)
iter_cls	closure for iter

Returns

the number of results found

Definition at line 261 of file plugin_datacache_sqlite.c.

{
  struct Plugin *plugin = cls;
  struct GNUNET_TIME_Absolute now;
  unsigned int cnt;
  uint32_t off;
  uint32_t btype32;
  uint32_t bro32;
  unsigned int total;
  struct GNUNET_DATACACHE_Block block;
  void *path;
  void *data;
  size_t path_size;
  struct GNUNET_SQ_QueryParam params_count[] = {
    GNUNET_SQ_query_param_auto_from_type (key),
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_QueryParam params_select[] = {
    GNUNET_SQ_query_param_auto_from_type (key),
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_uint32 (&off),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_ResultSpec rs[] = {
    GNUNET_SQ_result_spec_variable_size (&data,
                                         &block.data_size),
    GNUNET_SQ_result_spec_absolute_time (&block.expiration_time),
    GNUNET_SQ_result_spec_variable_size (&path,
                                         &path_size),
    GNUNET_SQ_result_spec_auto_from_type (&block.trunc_peer),
    GNUNET_SQ_result_spec_uint32 (&btype32),
    GNUNET_SQ_result_spec_uint32 (&bro32),
    GNUNET_SQ_result_spec_end
  };
 
  now = GNUNET_TIME_absolute_get ();
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Processing GET for key `%s'\n",
       GNUNET_h2s (key));
 
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->get_count_any_stmt,
                      params_count))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite3_bind_xxx");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_count_any_stmt);
    return 0;
  }
  if (SQLITE_ROW !=
      sqlite3_step (plugin->get_count_any_stmt))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite_step");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_count_any_stmt);
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "No content found when processing GET for key `%s'\n",
         GNUNET_h2s (key));
    return 0;
  }
  total = sqlite3_column_int (plugin->get_count_any_stmt,
                              0);
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->get_count_any_stmt);
  if ( (0 == total) ||
       (NULL == iter) )
  {
    if (0 == total)
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "No content found when processing GET for key `%s'\n",
           GNUNET_h2s (key));
    return total;
  }
 
  cnt = 0;
  block.key = *key;
  off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
                                  total);
  while (cnt < total)
  {
    off = (off + 1) % total;
    if (GNUNET_OK !=
        GNUNET_SQ_bind (plugin->get_any_stmt,
                        params_select))
    {
      LOG_SQLITE (plugin->dbh,
                  GNUNET_ERROR_TYPE_ERROR,
                  "sqlite3_bind_xxx");
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_any_stmt);
      return cnt;
    }
    if (SQLITE_ROW !=
        sqlite3_step (plugin->get_any_stmt))
      break;
    if (GNUNET_OK !=
        GNUNET_SQ_extract_result (plugin->get_any_stmt,
                                  rs))
    {
      GNUNET_break (0);
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_any_stmt);
      break;
    }
    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) btype32;
    block.ro = (enum GNUNET_DHT_RouteOption) bro32;
    cnt++;
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Found %u-byte result when processing GET for key `%s'\n",
         (unsigned int) block.data_size,
         GNUNET_h2s (&block.key));
    if (GNUNET_OK !=
        iter (iter_cls,
              &block))
    {
      GNUNET_SQ_cleanup_result (rs);
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_any_stmt);
      break;
    }
    GNUNET_SQ_cleanup_result (rs);
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_any_stmt);
  }
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->get_any_stmt);
  return cnt;
}

References GNUNET_DATACACHE_Block::data, data, GNUNET_DATACACHE_Block::data_size, GNUNET_DATACACHE_Block::expiration_time, GNUNET_break, GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_h2s(), GNUNET_OK, GNUNET_SQ_bind(), GNUNET_SQ_cleanup_result(), GNUNET_SQ_extract_result(), GNUNET_SQ_query_param_absolute_time(), GNUNET_SQ_query_param_auto_from_type, GNUNET_SQ_query_param_end, GNUNET_SQ_query_param_uint32(), GNUNET_SQ_reset(), GNUNET_SQ_result_spec_absolute_time(), GNUNET_SQ_result_spec_auto_from_type, GNUNET_SQ_result_spec_end, GNUNET_SQ_result_spec_uint32(), GNUNET_SQ_result_spec_variable_size(), GNUNET_TIME_absolute_get(), key, GNUNET_DATACACHE_Block::key, LOG, LOG_SQLITE, plugin, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, and GNUNET_DATACACHE_Block::type.

Referenced by sqlite_plugin_del().

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get_typed()

static unsigned int get_typed ( 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
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 420 of file plugin_datacache_sqlite.c.

{
  struct Plugin *plugin = cls;
  uint32_t type32 = type;
  struct GNUNET_TIME_Absolute now;
  unsigned int cnt;
  uint32_t off;
  uint32_t bro32;
  unsigned int total;
  struct GNUNET_DATACACHE_Block block;
  void *path;
  void *data;
  size_t path_size;
  struct GNUNET_SQ_QueryParam params_count[] = {
    GNUNET_SQ_query_param_auto_from_type (key),
    GNUNET_SQ_query_param_uint32 (&type32),
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_QueryParam params_select[] = {
    GNUNET_SQ_query_param_auto_from_type (key),
    GNUNET_SQ_query_param_uint32 (&type32),
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_uint32 (&off),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_ResultSpec rs[] = {
    GNUNET_SQ_result_spec_variable_size (&data,
                                         &block.data_size),
    GNUNET_SQ_result_spec_absolute_time (&block.expiration_time),
    GNUNET_SQ_result_spec_variable_size (&path,
                                         &path_size),
    GNUNET_SQ_result_spec_auto_from_type (&block.trunc_peer),
    GNUNET_SQ_result_spec_uint32 (&bro32),
    GNUNET_SQ_result_spec_end
  };
 
  now = GNUNET_TIME_absolute_get ();
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Processing GET for key `%s'\n",
       GNUNET_h2s (key));
 
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->get_count_stmt,
                      params_count))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite3_bind_xxx");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_count_stmt);
    return 0;
  }
  if (SQLITE_ROW !=
      sqlite3_step (plugin->get_count_stmt))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite_step");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_count_stmt);
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "No content found when processing GET for key `%s'\n",
         GNUNET_h2s (key));
    return 0;
  }
  total = sqlite3_column_int (plugin->get_count_stmt,
                              0);
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->get_count_stmt);
  if ( (0 == total) ||
       (NULL == iter) )
  {
    if (0 == total)
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "No content found when processing GET for key `%s'\n",
           GNUNET_h2s (key));
    return total;
  }
 
  cnt = 0;
  block.key = *key;
  off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
                                  total);
  while (cnt < total)
  {
    off = (off + 1) % total;
    if (GNUNET_OK !=
        GNUNET_SQ_bind (plugin->get_stmt,
                        params_select))
    {
      LOG_SQLITE (plugin->dbh,
                  GNUNET_ERROR_TYPE_ERROR,
                  "sqlite3_bind_xxx");
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_stmt);
      return cnt;
    }
    if (SQLITE_ROW !=
        sqlite3_step (plugin->get_stmt))
      break;
    if (GNUNET_OK !=
        GNUNET_SQ_extract_result (plugin->get_stmt,
                                  rs))
    {
      GNUNET_break (0);
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_stmt);
      break;
    }
    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 = type;
    block.ro = (enum GNUNET_DHT_RouteOption) bro32;
    cnt++;
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Found %u-byte result when processing GET for key `%s'\n",
         (unsigned int) block.data_size,
         GNUNET_h2s (&block.key));
    if ( (NULL != iter) &&
         (GNUNET_OK !=
          iter (iter_cls,
                &block)) )
    {
      GNUNET_SQ_cleanup_result (rs);
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->get_stmt);
      break;
    }
    GNUNET_SQ_cleanup_result (rs);
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_stmt);
  }
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->get_stmt);
  return cnt;
}

References GNUNET_DATACACHE_Block::data, data, GNUNET_DATACACHE_Block::data_size, GNUNET_DATACACHE_Block::expiration_time, GNUNET_break, GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_h2s(), GNUNET_OK, GNUNET_SQ_bind(), GNUNET_SQ_cleanup_result(), GNUNET_SQ_extract_result(), GNUNET_SQ_query_param_absolute_time(), GNUNET_SQ_query_param_auto_from_type, GNUNET_SQ_query_param_end, GNUNET_SQ_query_param_uint32(), GNUNET_SQ_reset(), GNUNET_SQ_result_spec_absolute_time(), GNUNET_SQ_result_spec_auto_from_type, GNUNET_SQ_result_spec_end, GNUNET_SQ_result_spec_uint32(), GNUNET_SQ_result_spec_variable_size(), GNUNET_TIME_absolute_get(), key, GNUNET_DATACACHE_Block::key, LOG, LOG_SQLITE, plugin, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, GNUNET_DATACACHE_Block::type, and type.

Referenced by sqlite_plugin_del().

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sqlite_plugin_get()

static unsigned int sqlite_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
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 582 of file plugin_datacache_sqlite.c.

{
  if (GNUNET_BLOCK_TYPE_ANY == type)
    return get_any (cls,
                    key,
                    iter,
                    iter_cls);
  return get_typed (cls,
                    key,
                    type,
                    iter,
                    iter_cls);
}

Referenced by libgnunet_plugin_datacache_sqlite_init().

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sqlite_plugin_del()

static enum GNUNET_GenericReturnValue sqlite_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 582 of file plugin_datacache_sqlite.c.

{
  struct Plugin *plugin = cls;
  uint64_t rowid;
  void *data;
  size_t data_size;
  struct GNUNET_HashCode hc;
  struct GNUNET_TIME_Absolute now;
  struct GNUNET_SQ_ResultSpec rs[] = {
    GNUNET_SQ_result_spec_uint64 (&rowid),
    GNUNET_SQ_result_spec_auto_from_type (&hc),
    GNUNET_SQ_result_spec_variable_size (&data,
                                         &data_size),
    GNUNET_SQ_result_spec_end
  };
  struct GNUNET_SQ_QueryParam params[] = {
    GNUNET_SQ_query_param_uint64 (&rowid),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_QueryParam time_params[] = {
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_end
  };
 
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Processing DEL\n");
  now = GNUNET_TIME_absolute_get ();
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->del_expired_stmt,
                      time_params))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sqlite3_bind");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->del_expired_stmt);
    return GNUNET_SYSERR;
  }
  if ( (SQLITE_ROW !=
        sqlite3_step (plugin->del_expired_stmt)) ||
       (GNUNET_OK !=
        GNUNET_SQ_extract_result (plugin->del_expired_stmt,
                                  rs)))
  {
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->del_expired_stmt);
    if (SQLITE_ROW !=
        sqlite3_step (plugin->del_select_stmt))
    {
      LOG_SQLITE (plugin->dbh,
                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                  "sqlite3_step");
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->del_select_stmt);
      return GNUNET_SYSERR;
    }
    if (GNUNET_OK !=
        GNUNET_SQ_extract_result (plugin->del_select_stmt,
                                  rs))
    {
      GNUNET_SQ_reset (plugin->dbh,
                       plugin->del_select_stmt);
      GNUNET_break (0);
      return GNUNET_SYSERR;
    }
  }
  GNUNET_SQ_cleanup_result (rs);
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->del_select_stmt);
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->del_stmt,
                      params))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sqlite3_bind");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->del_stmt);
    return GNUNET_SYSERR;
  }
  if (SQLITE_DONE !=
      sqlite3_step (plugin->del_stmt))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sqlite3_step");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->del_stmt);
    return GNUNET_SYSERR;
  }
  plugin->num_items--;
  plugin->env->delete_notify (plugin->env->cls,
                              &hc,
                              data_size + OVERHEAD);
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->del_stmt);
  return GNUNET_OK;
}

References get_any(), get_typed(), GNUNET_BLOCK_TYPE_ANY, key, and type.

Referenced by libgnunet_plugin_datacache_sqlite_init().

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sqlite_plugin_get_closest()

static unsigned int sqlite_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 724 of file plugin_datacache_sqlite.c.

{
  struct Plugin *plugin = cls;
  uint32_t type32 = type;
  uint32_t num_results32 = num_results;
  struct GNUNET_TIME_Absolute now;
  void *data;
  void *path;
  size_t path_size;
  unsigned int cnt;
  uint32_t bro32;
  struct GNUNET_DATACACHE_Block block;
  uint32_t rtype32;
  struct GNUNET_SQ_QueryParam params[] = {
    GNUNET_SQ_query_param_auto_from_type (key),
    GNUNET_SQ_query_param_absolute_time (&now),
    GNUNET_SQ_query_param_uint32 (&type32),
    GNUNET_SQ_query_param_uint32 (&num_results32),
    GNUNET_SQ_query_param_end
  };
  struct GNUNET_SQ_ResultSpec rs[] = {
    GNUNET_SQ_result_spec_variable_size (&data,
                                         &block.data_size),
    GNUNET_SQ_result_spec_absolute_time (&block.expiration_time),
    GNUNET_SQ_result_spec_variable_size (&path,
                                         &path_size),
    GNUNET_SQ_result_spec_auto_from_type (&block.trunc_peer),
    GNUNET_SQ_result_spec_uint32 (&rtype32),
    GNUNET_SQ_result_spec_uint32 (&bro32),
    GNUNET_SQ_result_spec_auto_from_type (&block.key),
    GNUNET_SQ_result_spec_end
  };
 
  now = GNUNET_TIME_absolute_get ();
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Processing GET_CLOSEST for key `%s'\n",
       GNUNET_h2s (key));
  if (GNUNET_OK !=
      GNUNET_SQ_bind (plugin->get_closest_stmt,
                      params))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sqlite3_bind_xxx");
    GNUNET_SQ_reset (plugin->dbh,
                     plugin->get_closest_stmt);
    return 0;
  }
  cnt = 0;
  while (SQLITE_ROW ==
         sqlite3_step (plugin->get_closest_stmt))
  {
    if (GNUNET_OK !=
        GNUNET_SQ_extract_result (plugin->get_closest_stmt,
                                  rs))
    {
      GNUNET_break (0);
      break;
    }
    if (0 != path_size % sizeof(struct GNUNET_DHT_PathElement))
    {
      GNUNET_break (0);
      path_size = 0;
      path = NULL;
    }
    block.put_path_length
      = path_size / sizeof(struct GNUNET_DHT_PathElement);
    block.put_path = path;
    block.data = data;
    block.type = (enum GNUNET_BLOCK_Type) rtype32;
    block.ro = (enum GNUNET_DHT_RouteOption) bro32;
    cnt++;
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Found %u-byte result at %s when processing GET_CLOSE\n",
         (unsigned int) block.data_size,
         GNUNET_h2s (&block.key));
 
    if (GNUNET_OK !=
        iter (iter_cls,
              &block))
    {
      GNUNET_SQ_cleanup_result (rs);
      break;
    }
    GNUNET_SQ_cleanup_result (rs);
  }
  GNUNET_SQ_reset (plugin->dbh,
                   plugin->get_closest_stmt);
  return cnt;
}

References GNUNET_DATACACHE_Block::data, data, GNUNET_DATACACHE_Block::data_size, GNUNET_DATACACHE_Block::expiration_time, GNUNET_break, GNUNET_ERROR_TYPE_BULK, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_h2s(), GNUNET_OK, GNUNET_SQ_bind(), GNUNET_SQ_cleanup_result(), GNUNET_SQ_extract_result(), GNUNET_SQ_query_param_absolute_time(), GNUNET_SQ_query_param_auto_from_type, GNUNET_SQ_query_param_end, GNUNET_SQ_query_param_uint32(), GNUNET_SQ_reset(), GNUNET_SQ_result_spec_absolute_time(), GNUNET_SQ_result_spec_auto_from_type, GNUNET_SQ_result_spec_end, GNUNET_SQ_result_spec_uint32(), GNUNET_SQ_result_spec_variable_size(), GNUNET_TIME_absolute_get(), key, GNUNET_DATACACHE_Block::key, LOG, LOG_SQLITE, plugin, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, GNUNET_DATACACHE_Block::type, and type.

Referenced by libgnunet_plugin_datacache_sqlite_init().

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libgnunet_plugin_datacache_sqlite_init()

void* libgnunet_plugin_datacache_sqlite_init

(

void *

cls

)

Entry point for the plugin.

Parameters

cls	closure (the struct GNUNET_DATACACHE_PluginEnvironment)

Returns

the plugin's closure (our struct Plugin)

Definition at line 828 of file plugin_datacache_sqlite.c.

{
  struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
  struct GNUNET_DATACACHE_PluginFunctions *api;
  struct Plugin *plugin;
  char *fn;
  char *fn_utf8;
  sqlite3 *dbh;
  char *emsg;
 
  if (GNUNET_YES ==
      GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
                                            "datacache-sqlite",
                                            "IN_MEMORY"))
  {
    if (SQLITE_OK !=
        sqlite3_open (":memory:",
                      &dbh))
      return NULL;
    fn_utf8 = NULL;
  }
  else
  {
    fn = GNUNET_DISK_mktemp ("gnunet-datacache");
    if (NULL == fn)
    {
      GNUNET_break (0);
      return NULL;
    }
    /* fn should be UTF-8-encoded. If it isn't, it's a bug. */
    fn_utf8 = GNUNET_strdup (fn);
    if (SQLITE_OK !=
        sqlite3_open (fn_utf8,
                      &dbh))
    {
      GNUNET_free (fn);
      GNUNET_free (fn_utf8);
      return NULL;
    }
    GNUNET_free (fn);
  }
 
  SQLITE3_EXEC (dbh, "PRAGMA temp_store=MEMORY");
  SQLITE3_EXEC (dbh, "PRAGMA locking_mode=EXCLUSIVE");
  SQLITE3_EXEC (dbh, "PRAGMA journal_mode=OFF");
  SQLITE3_EXEC (dbh, "PRAGMA synchronous=OFF");
  SQLITE3_EXEC (dbh, "PRAGMA page_size=4092");
  if (GNUNET_YES ==
      GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
                                            "datacache-sqlite",
                                            "IN_MEMORY"))
    SQLITE3_EXEC (dbh, "PRAGMA sqlite_temp_store=3");
 
  SQLITE3_EXEC (dbh,
                "CREATE TABLE ds180 ("
                "  type INTEGER NOT NULL DEFAULT 0,"
                "  ro INTEGER NOT NULL DEFAULT 0,"
                "  expire INTEGER NOT NULL,"
                "  key BLOB NOT NULL DEFAULT '',"
                "  prox INTEGER NOT NULL,"
                "  value BLOB NOT NULL,"
                "  trunc BLOB NOT NULL,"
                "  path BLOB DEFAULT '')");
  SQLITE3_EXEC (dbh,
                "CREATE INDEX idx_hashidx"
                " ON ds180 (key,type,expire)");
  SQLITE3_EXEC (dbh,
                "CREATE INDEX idx_prox_expire"
                " ON ds180 (prox,expire)");
  SQLITE3_EXEC (dbh,
                "CREATE INDEX idx_expire_only"
                " ON ds180 (expire)");
  plugin = GNUNET_new (struct Plugin);
  plugin->env = env;
  plugin->dbh = dbh;
  plugin->fn = fn_utf8;
 
  if ((SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "INSERT INTO ds180"
                   " (type, ro, expire, key, prox, value, path, trunc)"
                   " VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
                   &plugin->insert_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT COUNT(*) FROM ds180 "
                   "WHERE key=?"
                   " AND type=?"
                   " AND expire >= ?",
                   &plugin->get_count_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT COUNT(*) FROM ds180 "
                   "WHERE key=? AND expire >= ?",
                   &plugin->get_count_any_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT value,expire,path,trunc,ro"
                   " FROM ds180"
                   " WHERE key=?"
                   " AND type=?"
                   " AND expire >= ?"
                   " LIMIT 1 OFFSET ?",
                   &plugin->get_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT value,expire,path,trunc,type,ro"
                   " FROM ds180"
                   " WHERE key=?"
                   " AND expire >= ?"
                   " LIMIT 1 OFFSET ?",
                   &plugin->get_any_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT _ROWID_,key,value FROM ds180"
                   " WHERE expire < ?1"
                   " ORDER BY expire ASC LIMIT 1",
                   &plugin->del_expired_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT _ROWID_,key,value FROM ds180"
                   " ORDER BY prox ASC, expire ASC LIMIT 1",
                   &plugin->del_select_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "DELETE FROM ds180 WHERE _ROWID_=?",
                   &plugin->del_stmt)) ||
      (SQLITE_OK !=
       sq_prepare (plugin->dbh,
                   "SELECT * FROM ("
                   " SELECT value,expire,path,trunc,type,ro,key"
                   " FROM ds180 "
                   " WHERE key>=?1 "
                   "  AND expire >= ?2"
                   "  AND ( (type=?3) or (0 == ?3) )"
                   " ORDER BY KEY ASC LIMIT ?4)"
                   "UNION "
                   "SELECT * FROM ("
                   " SELECT value,expire,path,trunc,type,ro,key"
                   " FROM ds180 "
                   " WHERE key<=?1 "
                   "  AND expire >= ?2"
                   "  AND ( (type=?3) or (0 == ?3) )"
                   " ORDER BY KEY DESC LIMIT ?4)",
                   &plugin->get_closest_stmt)))
  {
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sq_prepare");
    GNUNET_break (SQLITE_OK ==
                  sqlite3_close (plugin->dbh));
    GNUNET_free (plugin);
    return NULL;
  }
 
  api = GNUNET_new (struct GNUNET_DATACACHE_PluginFunctions);
  api->cls = plugin;
  api->get = &sqlite_plugin_get;
  api->put = &sqlite_plugin_put;
  api->del = &sqlite_plugin_del;
  api->get_closest = &sqlite_plugin_get_closest;
  LOG (GNUNET_ERROR_TYPE_INFO,
       "Sqlite datacache running\n");
  return api;
}

References Plugin::api, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_DATACACHE_PluginEnvironment::cls, Plugin::dbh, env, Plugin::fn, GNUNET_break, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_DISK_mktemp(), GNUNET_ERROR_TYPE_BULK, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_new, GNUNET_strdup, GNUNET_YES, LOG, LOG_SQLITE, plugin, sq_prepare(), SQLITE3_EXEC, sqlite_plugin_del(), sqlite_plugin_get(), sqlite_plugin_get_closest(), and sqlite_plugin_put().

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libgnunet_plugin_datacache_sqlite_done()

void* libgnunet_plugin_datacache_sqlite_done

(

void *

cls

)

Exit point from the plugin.

Parameters

cls	closure (our struct Plugin)

Returns

NULL

Definition at line 1002 of file plugin_datacache_sqlite.c.

{
  struct GNUNET_DATACACHE_PluginFunctions *api = cls;
  struct Plugin *plugin = api->cls;
  int result;
 
#if SQLITE_VERSION_NUMBER >= 3007000
  sqlite3_stmt *stmt;
#endif
 
#if ! WINDOWS || defined(__CYGWIN__)
  if ( (NULL != plugin->fn) &&
       (0 != unlink (plugin->fn)) )
    LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING,
                       "unlink",
                       plugin->fn);
  GNUNET_free (plugin->fn);
#endif
  sqlite3_finalize (plugin->insert_stmt);
  sqlite3_finalize (plugin->get_count_stmt);
  sqlite3_finalize (plugin->get_count_any_stmt);
  sqlite3_finalize (plugin->get_stmt);
  sqlite3_finalize (plugin->get_any_stmt);
  sqlite3_finalize (plugin->del_select_stmt);
  sqlite3_finalize (plugin->del_expired_stmt);
  sqlite3_finalize (plugin->del_stmt);
  sqlite3_finalize (plugin->get_closest_stmt);
  result = sqlite3_close (plugin->dbh);
#if SQLITE_VERSION_NUMBER >= 3007000
  if (SQLITE_BUSY == result)
  {
    LOG (GNUNET_ERROR_TYPE_WARNING,
         _ (
           "Tried to close sqlite without finalizing all prepared statements.\n"));
    stmt = sqlite3_next_stmt (plugin->dbh,
                              NULL);
    while (NULL != stmt)
    {
      result = sqlite3_finalize (stmt);
      if (result != SQLITE_OK)
        LOG (GNUNET_ERROR_TYPE_WARNING,
             "Failed to close statement %p: %d\n",
             stmt,
             result);
      stmt = sqlite3_next_stmt (plugin->dbh,
                                NULL);
    }
    result = sqlite3_close (plugin->dbh);
  }
#endif
  if (SQLITE_OK != result)
    LOG_SQLITE (plugin->dbh,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite3_close");
 
  GNUNET_free (plugin);
  GNUNET_free (api);
  return NULL;
}

References _, Plugin::api, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_DATACACHE_PluginFunctions::cls, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, LOG, LOG_SQLITE, LOG_STRERROR_FILE, plugin, and result.