1 files changed, 743 insertions, 0 deletions

diff --git a/src/plugin/peerstore/plugin_peerstore_sqlite.c b/src/plugin/peerstore/plugin_peerstore_sqlite.c
new file mode 100644
index 000000000..c7132bd85
--- /dev/null
+++ b/src/plugin/peerstore/plugin_peerstore_sqlite.c
@@ -0,0 +1,743 @@
+/*
+ * This file is part of GNUnet
+ * Copyright (C) 2013, 2017 GNUnet e.V.
+ *
+ * GNUnet is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file peerstore/plugin_peerstore_sqlite.c
+ * @brief sqlite-based peerstore backend
+ * @author Omar Tarabai
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_peerstore_plugin.h"
+#include "gnunet_peerstore_service.h"
+#include "gnunet_sq_lib.h"
+#include "../../service/peerstore/peerstore.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, \
+                                                         "peerstore-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, "peerstore-sqlite", __VA_ARGS__)
+
+/**
+ * Context for all functions in this plugin.
+ */
+struct Plugin
+{
+  /**
+   * Configuration handle
+   */
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * Database filename.
+   */
+  char *fn;
+
+  /**
+   * Native SQLite database handle.
+   */
+  sqlite3 *dbh;
+
+  /**
+   * Precompiled SQL for inserting into peerstoredata
+   */
+  sqlite3_stmt *insert_peerstoredata;
+
+  /**
+   * Precompiled SQL for selecting from peerstoredata
+   */
+  sqlite3_stmt *select_peerstoredata;
+
+  /**
+   * Precompiled SQL for selecting from peerstoredata
+   */
+  sqlite3_stmt *select_peerstoredata_by_pid;
+
+  /**
+   * Precompiled SQL for selecting from peerstoredata
+   */
+  sqlite3_stmt *select_peerstoredata_by_key;
+
+  /**
+   * Precompiled SQL for selecting from peerstoredata
+   */
+  sqlite3_stmt *select_peerstoredata_by_all;
+
+  /**
+   * Precompiled SQL for deleting expired
+   * records from peerstoredata
+   */
+  sqlite3_stmt *expire_peerstoredata;
+
+  /**
+   * Precompiled SQL for deleting records
+   * with given key
+   */
+  sqlite3_stmt *delete_peerstoredata;
+};
+
+
+/**
+ * Delete records with the given key
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param sub_system name of sub system
+ * @param peer Peer identity (can be NULL)
+ * @param key entry key string (can be NULL)
+ * @return number of deleted records, #GNUNE_SYSERR on error
+ */
+static int
+peerstore_sqlite_delete_records (void *cls,
+                                 const char *sub_system,
+                                 const struct GNUNET_PeerIdentity *peer,
+                                 const char *key)
+{
+  struct Plugin *plugin = cls;
+  sqlite3_stmt *stmt = plugin->delete_peerstoredata;
+  struct GNUNET_SQ_QueryParam params[] = {
+    GNUNET_SQ_query_param_string (sub_system),
+    GNUNET_SQ_query_param_auto_from_type (peer),
+    GNUNET_SQ_query_param_string (key),
+    GNUNET_SQ_query_param_end
+  };
+  int ret;
+
+  if (GNUNET_OK !=
+      GNUNET_SQ_bind (stmt,
+                      params))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind");
+    GNUNET_SQ_reset (plugin->dbh,
+                     stmt);
+    return GNUNET_SYSERR;
+  }
+  if (SQLITE_DONE !=
+      sqlite3_step (stmt))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+    ret = GNUNET_SYSERR;
+  }
+  else
+  {
+    ret = sqlite3_changes (plugin->dbh);
+  }
+  GNUNET_SQ_reset (plugin->dbh,
+                   stmt);
+  return ret;
+}
+
+
+/**
+ * Delete expired records (expiry < now)
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param now time to use as reference
+ * @param cont continuation called with the number of records expired
+ * @param cont_cls continuation closure
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error and cont is not
+ * called
+ */
+static int
+peerstore_sqlite_expire_records (void *cls, struct GNUNET_TIME_Absolute now,
+                                 GNUNET_PEERSTORE_Continuation cont,
+                                 void *cont_cls)
+{
+  struct Plugin *plugin = cls;
+  sqlite3_stmt *stmt = plugin->expire_peerstoredata;
+  struct GNUNET_SQ_QueryParam params[] = {
+    GNUNET_SQ_query_param_absolute_time (&now),
+    GNUNET_SQ_query_param_end
+  };
+
+  if (GNUNET_OK !=
+      GNUNET_SQ_bind (stmt,
+                      params))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind");
+    GNUNET_SQ_reset (plugin->dbh,
+                     stmt);
+    return GNUNET_SYSERR;
+  }
+  if (SQLITE_DONE != sqlite3_step (stmt))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+    GNUNET_SQ_reset (plugin->dbh,
+                     stmt);
+    return GNUNET_SYSERR;
+  }
+  if (NULL != cont)
+    cont (cont_cls,
+          sqlite3_changes (plugin->dbh));
+  GNUNET_SQ_reset (plugin->dbh,
+                   stmt);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Iterate over the records given an optional peer id
+ * and/or key.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param sub_system name of sub system
+ * @param peer Peer identity (can be NULL)
+ * @param key entry key string (can be NULL)
+ * @param iter function to call asynchronously with the results, terminated
+ * by a NULL result
+ * @param iter_cls closure for @a iter
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error and iter is not
+ * called
+ */
+static int
+peerstore_sqlite_iterate_records (void *cls,
+                                  const char *sub_system,
+                                  const struct GNUNET_PeerIdentity *peer,
+                                  const char *key,
+                                  uint64_t serial,
+                                  uint64_t limit,
+                                  GNUNET_PEERSTORE_PluginProcessor iter,
+                                  void *iter_cls)
+{
+  struct Plugin *plugin = cls;
+  sqlite3_stmt *stmt;
+  int err = 0;
+  int sret;
+  int ret;
+  uint64_t seq;
+  struct GNUNET_PEERSTORE_Record rec;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Executing iterate request on sqlite db.\n");
+  if (NULL == peer)
+  {
+    if (NULL == key)
+    {
+      struct GNUNET_SQ_QueryParam params[] = {
+        GNUNET_SQ_query_param_string (sub_system),
+        GNUNET_SQ_query_param_uint64 (&serial),
+        GNUNET_SQ_query_param_uint64 (&limit),
+        GNUNET_SQ_query_param_end
+      };
+
+      stmt = plugin->select_peerstoredata;
+      err = GNUNET_SQ_bind (stmt,
+                            params);
+    }
+    else
+    {
+      struct GNUNET_SQ_QueryParam params[] = {
+        GNUNET_SQ_query_param_string (sub_system),
+        GNUNET_SQ_query_param_string (key),
+        GNUNET_SQ_query_param_uint64 (&serial),
+        GNUNET_SQ_query_param_uint64 (&limit),
+        GNUNET_SQ_query_param_end
+      };
+
+      stmt = plugin->select_peerstoredata_by_key;
+      err = GNUNET_SQ_bind (stmt,
+                            params);
+    }
+  }
+  else
+  {
+    if (NULL == key)
+    {
+      struct GNUNET_SQ_QueryParam params[] = {
+        GNUNET_SQ_query_param_string (sub_system),
+        GNUNET_SQ_query_param_auto_from_type (peer),
+        GNUNET_SQ_query_param_uint64 (&serial),
+        GNUNET_SQ_query_param_uint64 (&limit),
+        GNUNET_SQ_query_param_end
+      };
+
+      stmt = plugin->select_peerstoredata_by_pid;
+      err = GNUNET_SQ_bind (stmt,
+                            params);
+    }
+    else
+    {
+      struct GNUNET_SQ_QueryParam params[] = {
+        GNUNET_SQ_query_param_string (sub_system),
+        GNUNET_SQ_query_param_auto_from_type (peer),
+        GNUNET_SQ_query_param_string (key),
+        GNUNET_SQ_query_param_uint64 (&serial),
+        GNUNET_SQ_query_param_uint64 (&limit),
+        GNUNET_SQ_query_param_end
+      };
+
+      stmt = plugin->select_peerstoredata_by_all;
+      err = GNUNET_SQ_bind (stmt,
+                            params);
+    }
+  }
+
+  if (GNUNET_OK != err)
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind_XXXX");
+    GNUNET_SQ_reset (plugin->dbh,
+                     stmt);
+    return GNUNET_SYSERR;
+  }
+
+  err = 0;
+  ret = GNUNET_OK;
+  for (uint64_t i = 0; i < limit; i++)
+  {
+    sret = sqlite3_step (stmt);
+    if (SQLITE_DONE == sret)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Iteration done (no results)\n");
+      ret = GNUNET_NO;
+      break;
+    }
+    if (SQLITE_ROW != sret)
+    {
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR,
+                  "sqlite_step");
+      ret = GNUNET_SYSERR;
+      break;
+    }
+    {
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+           "Returning a matched record.\n");
+      struct GNUNET_SQ_ResultSpec rs[] = {
+        GNUNET_SQ_result_spec_uint64 (&seq),
+        GNUNET_SQ_result_spec_string (&rec.sub_system),
+        GNUNET_SQ_result_spec_auto_from_type (&rec.peer),
+        GNUNET_SQ_result_spec_string (&rec.key),
+        GNUNET_SQ_result_spec_variable_size (&rec.value, &rec.value_size),
+        GNUNET_SQ_result_spec_absolute_time (&rec.expiry),
+        GNUNET_SQ_result_spec_end
+      };
+
+      if (GNUNET_OK !=
+          GNUNET_SQ_extract_result (stmt,
+                                    rs))
+      {
+        GNUNET_break (0);
+        break;
+      }
+      if (NULL != iter)
+        iter (iter_cls,
+              seq,
+              &rec,
+              NULL);
+      GNUNET_SQ_cleanup_result (rs);
+    }
+  }
+  GNUNET_SQ_reset (plugin->dbh,
+                   stmt);
+  return ret;
+}
+
+
+/**
+ * Store a record in the peerstore.
+ * Key is the combination of sub system and peer identity.
+ * One key can store multiple values.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param sub_system name of the GNUnet sub system responsible
+ * @param peer peer identity
+ * @param key record key string
+ * @param value value to be stored
+ * @param size size of value to be stored
+ * @param expiry absolute time after which the record is (possibly) deleted
+ * @param options options related to the store operation
+ * @param cont continuation called when record is stored
+ * @param cont_cls continuation closure
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR and cont is not called
+ */
+static int
+peerstore_sqlite_store_record (void *cls,
+                               const char *sub_system,
+                               const struct GNUNET_PeerIdentity *peer,
+                               const char *key,
+                               const void *value,
+                               size_t size,
+                               struct GNUNET_TIME_Absolute expiry,
+                               enum GNUNET_PEERSTORE_StoreOption options,
+                               GNUNET_PEERSTORE_Continuation cont,
+                               void *cont_cls)
+{
+  struct Plugin *plugin = cls;
+  sqlite3_stmt *stmt;
+  struct GNUNET_SQ_QueryParam params[] = {
+    GNUNET_SQ_query_param_string (sub_system),
+    GNUNET_SQ_query_param_auto_from_type (peer),
+    GNUNET_SQ_query_param_string (key),
+    GNUNET_SQ_query_param_fixed_size (value, size),
+    GNUNET_SQ_query_param_absolute_time (&expiry),
+    GNUNET_SQ_query_param_end
+  };
+
+  if (GNUNET_PEERSTORE_STOREOPTION_REPLACE == options)
+  {
+    peerstore_sqlite_delete_records (cls,
+                                     sub_system,
+                                     peer,
+                                     key);
+  }
+
+  stmt = plugin->insert_peerstoredata;
+  if (GNUNET_OK !=
+      GNUNET_SQ_bind (stmt,
+                      params))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind");
+    GNUNET_assert (0);
+  }
+  if (SQLITE_DONE != sqlite3_step (stmt))
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+  }
+  GNUNET_SQ_reset (plugin->dbh,
+                   stmt);
+  if (NULL != cont)
+    cont (cont_cls,
+          GNUNET_OK);
+  return GNUNET_OK;
+}
+
+
+/**
+ * @brief Prepare a SQL statement
+ *
+ * @param dbh handle to the database
+ * @param sql SQL statement, UTF-8 encoded
+ * @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 (SQLITE_OK != result)
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _ ("Error executing SQL query: %s\n  %s\n"),
+         sqlite3_errmsg (dbh),
+         sql);
+  return result;
+}
+
+
+/**
+ * @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 (SQLITE_OK != result)
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _ ("Error preparing 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,
+                                               "peerstore-sqlite",
+                                               "FILENAME",
+                                               &filename))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                               "peerstore-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 (SQLITE_OK != sqlite3_open (plugin->fn,
+                                 &plugin->dbh))
+  {
+    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=OFF");
+  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 page_size=4096");
+  sqlite3_busy_timeout (plugin->dbh,
+                        BUSY_TIMEOUT_MS);
+  /* Create tables */
+  sql_exec (plugin->dbh,
+            "CREATE TABLE IF NOT EXISTS peerstoredata (\n"
+            "  uid INTEGER PRIMARY KEY,"
+            "  sub_system TEXT NOT NULL,\n"
+            "  peer_id BLOB NOT NULL,\n"
+            "  key TEXT NOT NULL,\n"
+            "  value BLOB NULL,\n"
+            "  expiry INT8 NOT NULL" ");");
+  /* Create Indices */
+  if (SQLITE_OK !=
+      sqlite3_exec (plugin->dbh,
+                    "CREATE INDEX IF NOT EXISTS peerstoredata_key_index ON peerstoredata (sub_system, peer_id, key, uid)",
+                    NULL,
+                    NULL,
+                    NULL))
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+         _ ("Unable to create indices: %s.\n"),
+         sqlite3_errmsg (plugin->dbh));
+    return GNUNET_SYSERR;
+  }
+  /* Prepare statements */
+
+  sql_prepare (plugin->dbh,
+               "INSERT INTO peerstoredata (sub_system, peer_id, key, value, expiry)"
+               " VALUES (?,?,?,?,?);",
+               &plugin->insert_peerstoredata);
+  sql_prepare (plugin->dbh,
+               "SELECT uid,sub_system,peer_id,key,value,expiry FROM peerstoredata"
+               " WHERE sub_system = ?"
+               " AND uid > ?"
+               " ORDER BY uid ASC"
+               " LIMIT ?",
+               &plugin->select_peerstoredata);
+  sql_prepare (plugin->dbh,
+               "SELECT uid,sub_system,peer_id,key,value,expiry FROM peerstoredata"
+               " WHERE sub_system = ?"
+               " AND peer_id = ?"
+               " AND uid > ?"
+               " ORDER BY uid ASC"
+               " LIMIT ?",
+               &plugin->select_peerstoredata_by_pid);
+  sql_prepare (plugin->dbh,
+               "SELECT uid,sub_system,peer_id,key,value,expiry FROM peerstoredata"
+               " WHERE sub_system = ?"
+               " AND key = ?"
+               " AND uid > ?"
+               " ORDER BY uid ASC"
+               " LIMIT ?",
+               &plugin->select_peerstoredata_by_key);
+  sql_prepare (plugin->dbh,
+               "SELECT uid,sub_system,peer_id,key,value,expiry FROM peerstoredata"
+               " WHERE sub_system = ?"
+               " AND peer_id = ?"
+               " AND key = ?"
+               " AND uid > ?"
+               " ORDER BY uid ASC"
+               " LIMIT ?",
+               &plugin->select_peerstoredata_by_all);
+  sql_prepare (plugin->dbh,
+               "DELETE FROM peerstoredata"
+               " WHERE expiry < ?",
+               &plugin->expire_peerstoredata);
+  sql_prepare (plugin->dbh,
+               "DELETE FROM peerstoredata"
+               " WHERE sub_system = ?"
+               " AND peer_id = ?" " AND key = ?",
+               &plugin->delete_peerstoredata);
+  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;
+
+  while (NULL != (stmt = sqlite3_next_stmt (plugin->dbh,
+                                            NULL)))
+  {
+    result = sqlite3_finalize (stmt);
+    if (SQLITE_OK != result)
+      LOG (GNUNET_ERROR_TYPE_WARNING,
+           "Failed to close statement %p: %d\n",
+           stmt,
+           result);
+  }
+  if (SQLITE_OK != sqlite3_close (plugin->dbh))
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR,
+                "sqlite3_close");
+  GNUNET_free (plugin->fn);
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls The struct GNUNET_CONFIGURATION_Handle.
+ * @return NULL on error, otherwise the plugin context
+ */
+void *
+libgnunet_plugin_peerstore_sqlite_init (void *cls)
+{
+  static struct Plugin plugin;
+  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
+  struct GNUNET_PEERSTORE_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_PEERSTORE_PluginFunctions);
+  api->cls = &plugin;
+  api->store_record = &peerstore_sqlite_store_record;
+  api->iterate_records = &peerstore_sqlite_iterate_records;
+  api->expire_records = &peerstore_sqlite_expire_records;
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Sqlite plugin is running\n");
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls The plugin context (as returned by "init")
+ * @return Always NULL
+ */
+void *
+libgnunet_plugin_peerstore_sqlite_done (void *cls)
+{
+  struct GNUNET_PEERSTORE_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_peerstore_sqlite.c */