1 files changed, 858 insertions, 0 deletions

diff --git a/src/psycstore/plugin_psycstore_sqlite.c b/src/psycstore/plugin_psycstore_sqlite.c
new file mode 100644
index 000000000..8bec31f12
--- /dev/null
+++ b/src/psycstore/plugin_psycstore_sqlite.c
@@ -0,0 +1,858 @@
+ /*
+  * This file is part of GNUnet
+  * (C) 2009-2013 Christian Grothoff (and other contributing authors)
+  *
+  * GNUnet is free software; you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License as published
+  * by the Free Software Foundation; either version 3, or (at your
+  * option) any later version.
+  *
+  * GNUnet is distributed in the hope that it will be useful, but
+  * WITHOUT ANY WARRANTY; without even the implied warranty of
+t  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  * General Public License for more details.
+  *
+  * You should have received a copy of the GNU General Public License
+  * along with GNUnet; see the file COPYING.  If not, write to the
+  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+  * Boston, MA 02111-1307, USA.
+  */
+
+/**
+ * @file psycstore/plugin_psycstore_sqlite.c
+ * @brief sqlite-based psycstore backend
+ * @author Gabor X Toth
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_psycstore_plugin.h"
+#include "gnunet_psycstore_service.h"
+#include "psycstore.h"
+#include <sqlite3.h>
+
+/**
+ * After how many ms "busy" should a DB operation fail for good?  A
+ * low value makes sure that we are more responsive to requests
+ * (especially PUTs).  A high value guarantees a higher success rate
+ * (SELECTs in iterate can take several seconds despite LIMIT=1).
+ *
+ * The default value of 1s should ensure that users do not experience
+ * huge latencies while at the same time allowing operations to
+ * succeed with reasonable probability.
+ */
+#define BUSY_TIMEOUT_MS 1000
+
+
+/**
+ * Log an error message at log-level 'level' that indicates
+ * a failure of the command 'cmd' on file 'filename'
+ * with the message given by strerror(errno).
+ */
+#define LOG_SQLITE(db, level, cmd) do { GNUNET_log_from (level, "psycstore-sqlite", _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, sqlite3_errmsg(db->dbh)); } while(0)
+
+#define LOG(kind,...) GNUNET_log_from (kind, "psycstore-sqlite", __VA_ARGS__)
+
+
+/**
+ * Context for all functions in this plugin.
+ */
+struct Plugin
+{
+
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * Database filename.
+   */
+  char *fn;
+
+  /**
+   * Native SQLite database handle.
+   */
+  sqlite3 *dbh;
+
+  /**
+   * Precompiled SQL for channel_key_store()
+   */
+  sqlite3_stmt *insert_channel_key;
+
+  /**
+   * Precompiled SQL for slave_key_store()
+   */
+  sqlite3_stmt *insert_slave_key;
+
+
+  /**
+   * Precompiled SQL for membership_store()
+   */
+  sqlite3_stmt *insert_membership;
+
+  /**
+   * Precompiled SQL for membership_test()
+   */
+  sqlite3_stmt *select_membership;
+
+
+  /**
+   * Precompiled SQL for fragment_store()
+   */
+  sqlite3_stmt *insert_fragment;
+
+  /**
+   * Precompiled SQL for fragment_add_flags()
+   */
+  sqlite3_stmt *update_fragment_flags;
+
+  /**
+   * Precompiled SQL for fragment_get()
+   */
+  sqlite3_stmt *select_fragment;
+
+  /**
+   * Precompiled SQL for message_get()
+   */
+  sqlite3_stmt *select_message;
+
+  /**
+   * Precompiled SQL for message_get_fragment()
+   */
+  sqlite3_stmt *select_message_fragment;
+
+  /**
+   * Precompiled SQL for counters_get_master()
+   */
+  sqlite3_stmt *select_master_counters;
+
+  /**
+   * Precompiled SQL for counters_get_slave()
+   */
+  sqlite3_stmt *select_slave_counters;
+
+
+  /**
+   * Precompiled SQL for state_set()
+   */
+  sqlite3_stmt *insert_state_current;
+
+  /**
+   * Precompiled SQL for state_set()
+   */
+  sqlite3_stmt *update_state_current;
+
+  /**
+   * Precompiled SQL for state_set_signed()
+   */
+  sqlite3_stmt *update_state_signed;
+
+  /**
+   * Precompiled SQL for state_sync()
+   */
+  sqlite3_stmt *insert_state_sync;
+
+  /**
+   * Precompiled SQL for state_sync()
+   */
+  sqlite3_stmt *delete_state;
+
+  /**
+   * Precompiled SQL for state_sync()
+   */
+  sqlite3_stmt *insert_state_from_sync;
+
+  /**
+   * Precompiled SQL for state_sync()
+   */
+  sqlite3_stmt *delete_state_sync;
+
+  /**
+   * Precompiled SQL for state_get()
+   */
+  sqlite3_stmt *select_state_one;
+
+  /**
+   * Precompiled SQL for state_get_all()
+   */
+  sqlite3_stmt *select_state_prefix;
+
+};
+
+
+/**
+ * @brief Prepare a SQL statement
+ *
+ * @param dbh handle to the database
+ * @param sql SQL statement, UTF-8 encoded
+ * @param stmt set to the prepared statement
+ * @return 0 on success
+ */
+static int
+sql_prepare (sqlite3 *dbh, const char *sql, sqlite3_stmt **stmt)
+{
+  char *tail;
+  int result;
+
+  result = sqlite3_prepare_v2 (dbh, sql, strlen (sql), stmt,
+                               (const char **) &tail);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "Prepared `%s' / %p: %d\n", sql, *stmt, result);
+  if (result != SQLITE_OK)
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _("Error preparing SQL query: %s\n  %s\n"),
+         sqlite3_errmsg (dbh), sql);
+  return result;
+}
+
+
+/**
+ * @brief Prepare a SQL statement
+ *
+ * @param dbh handle to the database
+ * @param zSql SQL statement, UTF-8 encoded
+ * @param ppStmt set to the prepared statement
+ * @return 0 on success
+ */
+static int
+sql_exec (sqlite3 *dbh, const char *sql)
+{
+  int result;
+
+  result = sqlite3_exec (dbh, sql, NULL, NULL, NULL);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "Executed `%s' / %d\n", sql, result);
+  if (result != SQLITE_OK)
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _("Error executing SQL query: %s\n  %s\n"),
+         sqlite3_errmsg (dbh), sql);
+  return result;
+}
+
+
+/**
+ * Initialize the database connections and associated
+ * data structures (create tables and indices
+ * as needed as well).
+ *
+ * @param plugin the plugin context (state for this module)
+ * @return GNUNET_OK on success
+ */
+static int
+database_setup (struct Plugin *plugin)
+{
+  char *filename;
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "psycstore-sqlite",
+                                               "FILENAME", &filename))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                               "psycstore-sqlite", "FILENAME");
+    return GNUNET_SYSERR;
+  }
+  if (GNUNET_OK != GNUNET_DISK_file_test (filename))
+  {
+    if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (filename))
+    {
+      GNUNET_break (0);
+      GNUNET_free (filename);
+      return GNUNET_SYSERR;
+    }
+  }
+  /* filename should be UTF-8-encoded. If it isn't, it's a bug */
+  plugin->fn = filename;
+
+  /* Open database and precompile statements */
+  if (sqlite3_open (plugin->fn, &plugin->dbh) != SQLITE_OK)
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _("Unable to initialize SQLite: %s.\n"),
+         sqlite3_errmsg (plugin->dbh));
+    return GNUNET_SYSERR;
+  }
+
+  sql_exec (plugin->dbh, "PRAGMA temp_store=MEMORY");
+  sql_exec (plugin->dbh, "PRAGMA synchronous=NORMAL");
+  sql_exec (plugin->dbh, "PRAGMA legacy_file_format=OFF");
+  sql_exec (plugin->dbh, "PRAGMA auto_vacuum=INCREMENTAL");
+  sql_exec (plugin->dbh, "PRAGMA encoding=\"UTF-8\"");
+  sql_exec (plugin->dbh, "PRAGMA locking_mode=EXCLUSIVE");
+  sql_exec (plugin->dbh, "PRAGMA count_changes=OFF");
+  sql_exec (plugin->dbh, "PRAGMA page_size=4096");
+
+  sqlite3_busy_timeout (plugin->dbh, BUSY_TIMEOUT_MS);
+
+  /* Create tables */
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS channels ("
+            "  id INTEGER PRIMARY KEY,"
+            "  pub_key BLOB UNIQUE"
+            ");");
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS slaves ("
+            "  id INTEGER PRIMARY KEY,"
+            "  pub_key BLOB UNIQUE"
+            ");");
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS membership ("
+            "  channel_id INTEGER NOT NULL REFERENCES channels(id),"
+            "  slave_id INTEGER NOT NULL REFERENCES slaves(id),"
+            "  did_join INTEGER NOT NULL,"
+            "  announced_at INTEGER NOT NULL,"
+            "  effective_since INTEGER NOT NULL,"
+            "  group_generation INTEGER NOT NULL"
+            ");");
+  sql_exec (plugin->dbh,
+            "CREATE INDEX IF NOT EXISTS idx_membership_channel_id_slave_id "
+            "ON membership (channel_id, slave_id);");
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS messages ("
+            "  channel_id INTEGER NOT NULL,"
+            "  hop_counter INTEGER NOT NULL,"
+            "  signature BLOB,"
+            "  purpose BLOB,"
+            "  fragment_id INTEGER NOT NULL,"
+            "  fragment_offset INTEGER NOT NULL,"
+            "  message_id INTEGER NOT NULL,"
+            "  group_generation INTEGER NOT NULL,"
+            "  multicast_flags INTEGER NOT NULL,"
+            "  psyc_flags INTEGER NOT NULL,"
+            "  data BLOB,"
+            "  PRIMARY KEY (channel_id, fragment_id),"
+            "  UNIQUE (channel_id, message_id, fragment_offset)"
+            ");");
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS state ("
+            "  channel_id INTEGER NOT NULL,"
+            "  name TEXT NOT NULL,"
+            "  value_current BLOB, "
+            "  value_signed BLOB, "
+            "  PRIMARY KEY (channel_id, name)"
+            ");");
+
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS state_sync ("
+            "  channel_id INTEGER NOT NULL,"
+            "  name TEXT NOT NULL,"
+            "  value BLOB, "
+            "  PRIMARY KEY (channel_id, name)"
+            ");");
+
+  /* Prepare statements */
+
+  sql_prepare (plugin->dbh,
+               "INSERT OR IGNORE INTO channels (pub_key) VALUES (?);",
+               &plugin->insert_channel_key);
+
+  sql_prepare (plugin->dbh,
+               "INSERT OR IGNORE INTO slaves (pub_key) VALUES (?);",
+               &plugin->insert_slave_key);
+
+  sql_prepare (plugin->dbh,
+               "INSERT INTO membership "
+               " (channel_id, slave_id, did_join, announced_at, "
+               "  effective_since, group_generation) "
+               "VALUES ((SELECT id FROM channels WHERE pub_key = ?), "
+               "        (SELECT id FROM slaves WHERE pub_key = ?), "
+               "        ?, ?, ?, ?);",
+               &plugin->insert_membership);
+
+  sql_prepare (plugin->dbh,
+               "SELECT did_join FROM membership "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND slave_id = ? AND effective_since <= ? "
+               "ORDER BY announced_at DESC LIMIT 1;",
+               &plugin->select_membership);
+
+  sql_prepare (plugin->dbh,
+               "INSERT INTO messages "
+               " (channel_id, hop_counter, signature, purpose, "
+               "  fragment_id, fragment_offset, message_id, "
+               "  group_generation, multicast_flags, psyc_flags, data) "
+               "VALUES ((SELECT id FROM channels WHERE pub_key = ?), "
+               "        ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);",
+               &plugin->insert_fragment);
+
+  sql_prepare (plugin->dbh,
+               "UPDATE messages "
+               "SET multicast_flags = multicast_flags | ?, "
+               "    psyc_flags = psyc_flags | ? "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND message_id = ?;",
+               &plugin->update_fragment_flags);
+
+  sql_prepare (plugin->dbh,
+               "SELECT hop_counter, signature, purpose, "
+               "       fragment_offset, message_id, group_generation, "
+               "       multicast_flags, psyc_flags, data "
+               "FROM messages "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND fragment_id = ?;",
+               &plugin->select_fragment);
+
+  sql_prepare (plugin->dbh,
+               "SELECT hop_counter, signature, purpose, "
+               "       fragment_id, fragment_offset, group_generation, "
+               "       multicast_flags, psyc_flags, data "
+               "FROM messages "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND message_id = ?;",
+               &plugin->select_message);
+
+  sql_prepare (plugin->dbh,
+               "SELECT hop_counter, signature, purpose, "
+               "       fragment_id, message_id, group_generation, "
+               "       multicast_flags, psyc_flags, data "
+               "FROM messages "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND message_id = ? AND fragment_offset = ?;",
+               &plugin->select_message_fragment);
+
+  sql_prepare (plugin->dbh,
+               "SELECT max(fragment_id), max(message_id), max(group_generation) "
+               "FROM messages "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?);",
+               &plugin->select_master_counters);
+
+  sql_prepare (plugin->dbh,
+               "SELECT max(message_id) "
+               "FROM messages "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND psyc_flags & ?;",
+               &plugin->select_slave_counters);
+
+  sql_prepare (plugin->dbh,
+               "INSERT OR REPLACE INTO state (channel_id, name, value_current) "
+               "VALUES ((SELECT id FROM channels WHERE pub_key = ?), ?, ?);",
+               &plugin->insert_state_current);
+
+  sql_prepare (plugin->dbh,
+               "UPDATE state "
+               "SET value_current = ? "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND name = ?;",
+               &plugin->update_state_current);
+
+  sql_prepare (plugin->dbh,
+               "UPDATE state "
+               "SET value_signed = value_current "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) ",
+               &plugin->update_state_signed);
+
+  sql_prepare (plugin->dbh,
+               "INSERT INTO state_sync (channel_id, name, value) "
+               "VALUES ((SELECT id FROM channels WHERE pub_key = ?), ?, ?);",
+               &plugin->insert_state_sync);
+
+  sql_prepare (plugin->dbh,
+               "DELETE FROM state "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?);",
+               &plugin->delete_state);
+
+  sql_prepare (plugin->dbh,
+               "INSERT INTO state "
+               " (channel_id, name, value_current, value_signed) "
+               "SELECT channel_id, name, value, value "
+               "FROM state_sync "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?);",
+               &plugin->insert_state_from_sync);
+
+  sql_prepare (plugin->dbh,
+               "DELETE FROM state_sync "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?);",
+               &plugin->delete_state_sync);
+
+  sql_prepare (plugin->dbh,
+               "SELECT value_current "
+               "FROM state "
+               "WHERE channel_id = (SELECT id FROM channels WHERE pub_key = ?) "
+               "      AND name = ?;",
+               &plugin->select_state_one);
+
+  sql_prepare (plugin->dbh,
+               "SELECT value_current "
+               "FROM state "
+               "WHERE name LIKE ? OR name LIKE ?;",
+               &plugin->select_state_prefix);
+
+  return GNUNET_OK;
+}
+
+
+/**
+ * Shutdown database connection and associate data
+ * structures.
+ * @param plugin the plugin context (state for this module)
+ */
+static void
+database_shutdown (struct Plugin *plugin)
+{
+  int result;
+  sqlite3_stmt *stmt;
+
+  if (NULL != plugin->insert_channel_key)
+    sqlite3_finalize (plugin->insert_channel_key);
+
+  if (NULL != plugin->insert_slave_key)
+    sqlite3_finalize (plugin->insert_slave_key);
+
+  if (NULL != plugin->insert_membership)
+    sqlite3_finalize (plugin->insert_membership);
+
+  if (NULL != plugin->select_membership)
+    sqlite3_finalize (plugin->select_membership);
+
+  if (NULL != plugin->insert_fragment)
+    sqlite3_finalize (plugin->insert_fragment);
+
+  if (NULL != plugin->update_fragment_flags)
+    sqlite3_finalize (plugin->update_fragment_flags);
+
+  if (NULL != plugin->select_fragment)
+    sqlite3_finalize (plugin->select_fragment);
+
+  if (NULL != plugin->select_message)
+    sqlite3_finalize (plugin->select_message);
+
+  if (NULL != plugin->select_message_fragment)
+    sqlite3_finalize (plugin->select_message_fragment);
+
+  if (NULL != plugin->select_master_counters)
+    sqlite3_finalize (plugin->select_master_counters);
+
+  if (NULL != plugin->select_slave_counters)
+    sqlite3_finalize (plugin->select_slave_counters);
+
+  if (NULL != plugin->insert_state_current)
+    sqlite3_finalize (plugin->insert_state_current);
+
+  if (NULL != plugin->update_state_current)
+    sqlite3_finalize (plugin->update_state_current);
+
+  if (NULL != plugin->update_state_signed)
+    sqlite3_finalize (plugin->update_state_signed);
+
+  if (NULL != plugin->insert_state_sync)
+    sqlite3_finalize (plugin->insert_state_sync);
+
+  if (NULL != plugin->delete_state)
+    sqlite3_finalize (plugin->delete_state);
+
+  if (NULL != plugin->insert_state_from_sync)
+    sqlite3_finalize (plugin->insert_state_from_sync);
+
+  if (NULL != plugin->delete_state_sync)
+    sqlite3_finalize (plugin->delete_state_sync);
+
+  if (NULL != plugin->select_state_one)
+    sqlite3_finalize (plugin->select_state_one);
+
+  if (NULL != plugin->select_state_prefix)
+    sqlite3_finalize (plugin->select_state_prefix);
+
+  result = sqlite3_close (plugin->dbh);
+  if (result == SQLITE_BUSY)
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING,
+         _("Tried to close sqlite without finalizing all prepared statements.\n"));
+    stmt = sqlite3_next_stmt (plugin->dbh, NULL);
+    while (stmt != NULL)
+    {
+      GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "sqlite",
+                       "Closing statement %p\n", stmt);
+      result = sqlite3_finalize (stmt);
+      if (result != SQLITE_OK)
+        GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "sqlite",
+                         "Failed to close statement %p: %d\n", stmt, result);
+      stmt = sqlite3_next_stmt (plugin->dbh, NULL);
+    }
+    result = sqlite3_close (plugin->dbh);
+  }
+  if (SQLITE_OK != result)
+    LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
+
+  GNUNET_free_non_null (plugin->fn);
+}
+
+
+/** 
+ * Store join/leave events for a PSYC channel in order to be able to answer
+ * membership test queries later.
+ *
+ * @see GNUNET_PSYCSTORE_membership_store()
+ *
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_membership_store
+ (void *cls, 
+  const struct GNUNET_HashCode *channel_key,
+  const struct GNUNET_HashCode *slave_key,
+  int did_join,
+  uint64_t announced_at,
+  uint64_t effective_since,
+  uint64_t group_generation) {
+
+
+}
+
+/** 
+ * Test if a member was admitted to the channel at the given message ID.
+ *
+ * @see GNUNET_PSYCSTORE_membership_test()
+ * 
+ * @return #GNUNET_YES if the member was admitted, #GNUNET_NO if not,
+ *         #GNUNET_SYSERR if there was en error.
+ */
+int
+libgnunet_plugin_psycstore_sqlite_membership_test
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  const struct GNUNET_CRYPTO_EccPublicKey *slave_key,
+  uint64_t message_id,
+  uint64_t group_generation) {
+
+}
+
+/** 
+ * Store a message fragment sent to a channel.
+ *
+ * @see GNUNET_PSYCSTORE_fragment_store()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_fragment_store
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  const struct GNUNET_MULTICAST_MessageHeader *message) {
+
+}
+
+/** 
+ * Set additional flags for a given message.
+ *
+ * @param message_id ID of the message.
+ * @param flags Flags to add.
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_fragment_add_flags
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t message_id,
+  uint64_t multicast_flags,
+  uint64_t psyc_flags) {
+
+}
+
+/** 
+ * Retrieve a message fragment by fragment ID.
+ *
+ * @see GNUNET_PSYCSTORE_fragment_get()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_fragment_get
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t fragment_id,
+  GNUNET_PSYCSTORE_FragmentCallback cb,
+  void *cb_cls) {
+
+}
+
+/** 
+ * Retrieve all fragments of a message.
+ *
+ * @see GNUNET_PSYCSTORE_message_get()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_message_get
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t message_id,
+  GNUNET_PSYCSTORE_FragmentCallback cb,
+  void *cb_cls) {
+
+}
+
+/** 
+ * Retrieve a fragment of message specified by its message ID and fragment
+ * offset.
+ *
+ * @see GNUNET_PSYCSTORE_message_get_fragment()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_message_get_fragment
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t message_id,
+  uint64_t fragment_offset,
+  GNUNET_PSYCSTORE_FragmentCallback cb,
+  void *cb_cls)
+{
+
+}
+
+/** 
+ * Retrieve latest values of counters for a channel master.
+ *
+ * @see GNUNET_PSYCSTORE_counters_get_master()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_counters_get_master
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t *fragment_id,
+  uint64_t *message_id,
+  uint64_t *group_generation)
+{
+
+}
+
+/** 
+ * Retrieve latest values of counters for a channel slave. 
+ *
+ * @see GNUNET_PSYCSTORE_counters_get_slave()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_counters_get_slave
+ (void *cls,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  uint64_t *max_state_msg_id) {
+
+}
+
+/** 
+ * Set a state variable to the given value.
+ *
+ * @see GNUNET_PSYCSTORE_state_modify()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_state_set
+ (struct GNUNET_PSYCSTORE_Handle *h,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  const char *name,
+  size_t value_size,
+  const void *value) {
+
+}
+
+/** 
+ * Retrieve a state variable by name.
+ *
+ * @param name Name of the variable to retrieve.
+ * @param[out] value_size Size of value.
+ * @param[out] value Returned value.
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_state_get
+ (struct GNUNET_PSYCSTORE_Handle *h,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  const char *name,
+  GNUNET_PSYCSTORE_StateCallback cb,
+  void *cb_cls) {
+
+}
+
+/** 
+ * Retrieve all state variables for a channel with the given prefix.
+ *
+ * @see GNUNET_PSYCSTORE_state_get_all()
+ * 
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+int
+libgnunet_plugin_psycstore_sqlite_state_get_all
+ (struct GNUNET_PSYCSTORE_Handle *h,
+  const struct GNUNET_CRYPTO_EccPublicKey *channel_key,
+  const char *name,
+  GNUNET_PSYCSTORE_StateCallback cb,
+  void *cb_cls) {
+
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls the "struct GNUNET_PSYCSTORE_PluginEnvironment*"
+ * @return NULL on error, otherwise the plugin context
+ */
+void *
+libgnunet_plugin_psycstore_sqlite_init (void *cls)
+{
+  static struct Plugin plugin;
+  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
+  struct GNUNET_PSYCSTORE_PluginFunctions *api;
+
+  if (NULL != plugin.cfg)
+    return NULL;                /* can only initialize once! */
+  memset (&plugin, 0, sizeof (struct Plugin));
+  plugin.cfg = cfg;  
+  if (GNUNET_OK != database_setup (&plugin))
+  {
+    database_shutdown (&plugin);
+    return NULL;
+  }
+  api = GNUNET_new (struct GNUNET_PSYCSTORE_PluginFunctions);
+  api->cls = &plugin;
+  api->membership_store = &libgnunet_plugin_psycstore_sqlite_membership_store;
+  api->membership_test = &libgnunet_plugin_psycstore_sqlite_membership_test;
+  api->fragment_store = &libgnunet_plugin_psycstore_sqlite_fragment_store;
+  api->fragment_add_flags = &libgnunet_plugin_psycstore_sqlite_fragment_add_flags;
+  api->fragment_get = &libgnunet_plugin_psycstore_sqlite_fragment_get;
+  api->message_get = &libgnunet_plugin_psycstore_sqlite_message_get;
+  api->message_get_fragment = &libgnunet_plugin_psycstore_sqlite_message_get_fragment;
+  api->counters_get_master = &libgnunet_plugin_psycstore_sqlite_counters_get_master;
+  api->counters_get_slave = &libgnunet_plugin_psycstore_sqlite_counters_get_slave;
+  api->state_set = &libgnunet_plugin_psycstore_sqlite_state_set;
+  api->state_get = &libgnunet_plugin_psycstore_sqlite_state_get;
+  api->state_get_all = &libgnunet_plugin_psycstore_sqlite_state_get_all;
+
+  LOG (GNUNET_ERROR_TYPE_INFO, 
+       _("Sqlite database running\n"));
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the plugin context (as returned by "init")
+ * @return always NULL
+ */
+void *
+libgnunet_plugin_psycstore_sqlite_done (void *cls)
+{
+  struct GNUNET_PSYCSTORE_PluginFunctions *api = cls;
+  struct Plugin *plugin = api->cls;
+
+  database_shutdown (plugin);
+  plugin->cfg = NULL;
+  GNUNET_free (api);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "sqlite plugin is finished\n");
+  return NULL;
+}
+
+/* end of plugin_psycstore_sqlite.c */