[GNUnet-SVN] r19880 - gnunet/src/namestore

[gnunet]

Author: grothoff
Date: 2012-02-21 10:15:27 +0100 (Tue, 21 Feb 2012)
New Revision: 19880

Added:
   gnunet/src/namestore/plugin_namestore_sqlite.c
Log:
-skeleton for sqlite database plugin

Added: gnunet/src/namestore/plugin_namestore_sqlite.c
===================================================================
--- gnunet/src/namestore/plugin_namestore_sqlite.c                              
(rev 0)
+++ gnunet/src/namestore/plugin_namestore_sqlite.c      2012-02-21 09:15:27 UTC 
(rev 19880)
@@ -0,0 +1,649 @@
+ /*
+  * This file is part of GNUnet
+  * (C) 2009, 2011, 2012 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
+  * 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 namestore/plugin_namestore_sqlite.c
+ * @brief sqlite-based namestore backend
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_namestore_plugin.h"
+#include <sqlite3.h>
+
+/**
+ * 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, msg, level, cmd) do { GNUNET_log_from (level, 
"namestore-sqlite", _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, 
__LINE__, sqlite3_errmsg(db->dbh)); if (msg != NULL) GNUNET_asprintf(msg, 
_("`%s' failed at %s:%u with error: %s"), cmd, __FILE__, __LINE__, 
sqlite3_errmsg(db->dbh)); } while(0)
+
+#define LOG(kind,...) GNUNET_log_from (kind, "namestore-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 put record
+   */
+  sqlite3_stmt *put_record;
+
+  /**
+   * Precompiled SQL for put node
+   */
+  sqlite3_stmt *put_node;
+
+  /**
+   * Precompiled SQL for put signature
+   */
+  sqlite3_stmt *put_signature;
+
+  /**
+   * Precompiled SQL for iterate records
+   */
+  sqlite3_stmt *iterate_records;
+
+  /**
+   * Precompiled SQL for get node
+   */
+  sqlite3_stmt *get_node;
+
+  /**
+   * Precompiled SQL for get signature
+   */
+  sqlite3_stmt *get_signature;
+
+  /**
+   * Precompiled SQL for delete zone
+   */
+  sqlite3_stmt *delete_zone;
+
+  /**
+   * Precompiled SQL for deleting old zone in 'put_signature'
+   */
+  sqlite3_stmt *delete_old_zone;
+
+};
+
+
+/**
+ * @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
+sq_prepare (sqlite3 * dbh, const char *zSql, sqlite3_stmt ** ppStmt)
+{
+  char *dummy;
+  int result;
+
+  result =
+      sqlite3_prepare_v2 (dbh, zSql, strlen (zSql), ppStmt,
+                          (const char **) &dummy);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "Prepared `%s' / %p: %d\n", zSql, *ppStmt, result);
+  return result;
+}
+
+
+/**
+ * Create our database indices.
+ *
+ * @param dbh handle to the database
+ */
+static void
+create_indices (sqlite3 * dbh)
+{
+  /* create indices */
+  if (SQLITE_OK !=
+      sqlite3_exec (dbh, "CREATE INDEX IF NOT EXISTS idx_hash ON ns090 (hash)",
+                   NULL, NULL, NULL))
+    LOG (GNUNET_ERROR_TYPE_ERROR, 
+        "Failed to create indices: %s\n", sqlite3_errmsg (dbh));
+}
+
+
+#if 0
+#define CHECK(a) GNUNET_break(a)
+#define ENULL NULL
+#else
+#define ENULL &e
+#define ENULL_DEFINED 1
+#define CHECK(a) if (! a) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "%s\n", e); 
sqlite3_free(e); }
+#endif
+
+
+/**
+ * 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)
+{
+  sqlite3_stmt *stmt;
+  char *afsdir;
+#if ENULL_DEFINED
+  char *e;
+#endif
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "namestore-sqlite",
+                                               "FILENAME", &afsdir))
+    {
+    LOG (GNUNET_ERROR_TYPE_ERROR, 
+        _ ("Option `%s' in section `%s' missing in configuration!\n"),
+        "FILENAME", "namestore-sqlite");
+    return GNUNET_SYSERR;
+  }
+  if (GNUNET_OK != GNUNET_DISK_file_test (afsdir))
+  {
+    if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (afsdir))
+    {
+      GNUNET_break (0);
+      GNUNET_free (afsdir);
+      return GNUNET_SYSERR;
+    }
+  }
+#ifdef ENABLE_NLS
+  plugin->fn =
+      GNUNET_STRINGS_to_utf8 (afsdir, strlen (afsdir), nl_langinfo (CODESET));
+#else
+  plugin->fn = GNUNET_STRINGS_to_utf8 (afsdir, strlen (afsdir), "UTF-8");      
 /* good luck */
+#endif
+  GNUNET_free (afsdir);
+
+  /* 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;
+  }
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA temp_store=MEMORY", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA synchronous=OFF", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA legacy_file_format=OFF", NULL, 
NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA auto_vacuum=INCREMENTAL", NULL,
+                       NULL, ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA locking_mode=EXCLUSIVE", NULL, 
NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA count_changes=OFF", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh, "PRAGMA page_size=4092", NULL, NULL,
+                       ENULL));
+
+  //  CHECK (SQLITE_OK == sqlite3_busy_timeout (plugin->dbh, 
BUSY_TIMEOUT_MS)); ?
+
+
+  /* We have to do it here, because otherwise precompiling SQL might fail */
+  CHECK (SQLITE_OK ==
+         sq_prepare (plugin->dbh,
+                     "SELECT 1 FROM sqlite_master WHERE tbl_name = 'ns090'",
+                     &stmt));
+  if ((sqlite3_step (stmt) == SQLITE_DONE) &&
+      (sqlite3_exec
+       (plugin->dbh,
+        "CREATE TABLE ns090 (" "  repl INT4 NOT NULL DEFAULT 0,"
+        "  type INT4 NOT NULL DEFAULT 0," "  prio INT4 NOT NULL DEFAULT 0,"
+        "  anonLevel INT4 NOT NULL DEFAULT 0,"
+        "  expire INT8 NOT NULL DEFAULT 0," "  rvalue INT8 NOT NULL,"
+        "  hash TEXT NOT NULL DEFAULT ''," "  vhash TEXT NOT NULL DEFAULT '',"
+        "  value BLOB NOT NULL DEFAULT '')", NULL, NULL, NULL) != SQLITE_OK))
+  {
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR, "sqlite3_exec");
+    sqlite3_finalize (stmt);
+    return GNUNET_SYSERR;
+  }
+  sqlite3_finalize (stmt);
+  create_indices (plugin->dbh);
+
+  if ((sq_prepare
+       (plugin->dbh,
+        "UPDATE gn090 "
+        "SET prio = prio + ?, expire = MAX(expire,?) WHERE _ROWID_ = ?",
+        &plugin->put_record) != SQLITE_OK) )
+  {
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR, "precompiling");
+    return GNUNET_SYSERR;
+  }
+  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 (plugin->put_record != NULL)
+    sqlite3_finalize (plugin->put_record);
+
+  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, NULL, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
+
+  GNUNET_free_non_null (plugin->fn);
+}
+
+
+/**
+ * Store a record in the datastore.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone hash of the public key of the zone
+ * @param record_hash hash of the record 
+ * @param record_key XOR of zone and hash of name
+ * @param name name that is being mapped (at most 255 characters long)
+ * @param record_type type of the record (A, AAAA, PKEY, etc.)
+ * @param expiration expiration time for the content
+ * @param flags flags for the content
+ * @param data_size number of bytes in data
+ * @param data value, semantics depend on 'record_type' (see RFCs for DNS and 
+ *             GNS specification for GNS extensions)
+ * @return GNUNET_OK on success
+ */
+static int 
+namestore_sqlite_put_record (void *cls, 
+                            const GNUNET_HashCode *zone,
+                            const GNUNET_HashCode *record_hash,
+                            const GNUNET_HashCode *record_key,
+                            const char *name,
+                            uint32_t record_type,
+                            struct GNUNET_TIME_Absolute expiration,
+                            enum GNUNET_NAMESTORE_RecordFlags flags,
+                            size_t data_size,
+                            const void *data)
+{
+#if 0
+  struct Plugin *plugin = cls;
+  int n;
+
+  if ((SQLITE_OK != sqlite3_bind_int (plugin->updPrio, 1, delta)) ||
+      (SQLITE_OK != sqlite3_bind_int64 (plugin->updPrio, 2, expire.abs_value))
+      || (SQLITE_OK != sqlite3_bind_int64 (plugin->updPrio, 3, uid)))
+  {
+    LOG_SQLITE (plugin, msg, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind_XXXX");
+    if (SQLITE_OK != sqlite3_reset (plugin->updPrio))
+      LOG_SQLITE (plugin, NULL,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_reset");
+    return GNUNET_SYSERR;
+
+  }
+  n = sqlite3_step (plugin->updPrio);
+  if (SQLITE_OK != sqlite3_reset (plugin->updPrio))
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_reset");
+  switch (n)
+  {
+  case SQLITE_DONE:
+    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "sqlite", "Block updated\n");
+    return GNUNET_OK;
+  case SQLITE_BUSY:
+    LOG_SQLITE (plugin, msg, GNUNET_ERROR_TYPE_WARNING | 
GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+    return GNUNET_NO;
+  default:
+    LOG_SQLITE (plugin, msg, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+    return GNUNET_SYSERR;
+  }
+#endif
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Store a Merkle tree node in the datastore.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone hash of public key of the zone
+ * @param loc location in the B-tree
+ * @param ploc parent's location in the B-tree (must have depth = loc.depth - 
1), NULL for root
+ * @param num_entries number of entries at this node in the B-tree
+ * @param entries the 'num_entries' entries to store (hashes over the
+ *                records)
+ * @return GNUNET_OK on success
+ */
+static int 
+namestore_sqlite_put_node (void *cls, 
+                          const GNUNET_HashCode *zone,
+                          const struct GNUNET_NAMESTORE_SignatureLocation *loc,
+                          const struct GNUNET_NAMESTORE_SignatureLocation 
*ploc,
+                          unsigned int num_entries,
+                          const GNUNET_HashCode *entries)
+{
+  return GNUNET_SYSERR;
+}
+  
+
+/**
+ * Store a zone signature in the datastore.  If a signature for the zone with a
+ * lower depth exists, the old signature is removed.  If a signature for an
+ * older revision of the zone exists, this will delete all records, nodes
+ * and signatures for the older revision of the zone.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone_key public key of the zone
+ * @param loc location in the B-tree (top of the tree, offset 0, depth at 
'maximum')
+ * @param top_sig signature at the top, NULL if 'loc.depth > 0'
+ * @param root_hash top level hash that is signed
+ * @return GNUNET_OK on success
+ */
+static int
+namestore_sqlite_put_signature (void *cls, 
+                               const struct 
GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key,
+                               const struct GNUNET_NAMESTORE_SignatureLocation 
*loc,
+                               const struct GNUNET_CRYPTO_RsaSignature 
*top_sig,
+                               const GNUNET_HashCode *root_hash)
+{
+  return GNUNET_SYSERR;
+}
+  
+  
+/**
+ * Iterate over the results for a particular key and zone in the
+ * datastore.  Will only query the latest revision known for the
+ * zone (as adding a new zone revision will cause the plugin to
+ * delete all records from previous revisions).
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone hash of public key of the zone
+ * @param record_key key for the record (XOR of zone and hash of name);
+ *                   NULL to iterate over all records of the zone
+ * @param iter maybe NULL (to just count)
+ * @param iter_cls closure for iter
+ * @return the number of results found
+ */
+static unsigned int 
+namestore_sqlite_iterate_records (void *cls, 
+                                 const GNUNET_HashCode *zone,
+                                 const GNUNET_HashCode *record_key,
+                                 GNUNET_NAMESTORE_RecordIterator iter, void 
*iter_cls)
+{
+#if 0
+  int n;
+  struct GNUNET_TIME_Absolute expiration;
+  unsigned long long rowid;
+  unsigned int size;
+  int ret;
+
+  n = sqlite3_step (stmt);
+  switch (n)
+  {
+  case SQLITE_ROW:
+    size = sqlite3_column_bytes (stmt, 5);
+    rowid = sqlite3_column_int64 (stmt, 6);
+    if (sqlite3_column_bytes (stmt, 4) != sizeof (GNUNET_HashCode))
+    {
+      GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "sqlite",
+                       _
+                       ("Invalid data in database.  Trying to fix (by 
deletion).\n"));
+      if (SQLITE_OK != sqlite3_reset (stmt))
+        LOG_SQLITE (plugin, NULL,
+                    GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                    "sqlite3_reset");
+      if (GNUNET_OK == delete_by_rowid (plugin, rowid))
+        plugin->env->duc (plugin->env->cls,
+                          -(size + GNUNET_NAMESTORE_ENTRY_OVERHEAD));
+      break;
+    }
+    expiration.abs_value = sqlite3_column_int64 (stmt, 3);
+#if DEBUG_SQLITE
+    GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "sqlite",
+                     "Found reply in database with expiration %llu\n",
+                     (unsigned long long) expiration.abs_value);
+#endif
+    ret = proc (proc_cls, sqlite3_column_blob (stmt, 4) /* key */ ,
+                size, sqlite3_column_blob (stmt, 5) /* data */ ,
+                sqlite3_column_int (stmt, 0) /* type */ ,
+                sqlite3_column_int (stmt, 1) /* priority */ ,
+                sqlite3_column_int (stmt, 2) /* anonymity */ ,
+                expiration, rowid);
+    if (SQLITE_OK != sqlite3_reset (stmt))
+      LOG_SQLITE (plugin, NULL,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_reset");
+    if ((GNUNET_NO == ret) && (GNUNET_OK == delete_by_rowid (plugin, rowid)))
+      plugin->env->duc (plugin->env->cls,
+                        -(size + GNUNET_NAMESTORE_ENTRY_OVERHEAD));
+    return;
+  case SQLITE_DONE:
+    /* database must be empty */
+    if (SQLITE_OK != sqlite3_reset (stmt))
+      LOG_SQLITE (plugin, NULL,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_reset");
+    break;
+  case SQLITE_BUSY:
+  case SQLITE_ERROR:
+  case SQLITE_MISUSE:
+  default:
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_step");
+    if (SQLITE_OK != sqlite3_reset (stmt))
+      LOG_SQLITE (plugin, NULL,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_reset");
+    GNUNET_break (0);
+    database_shutdown (plugin);
+    database_setup (plugin->env->cfg, plugin);
+    break;
+  }
+  if (SQLITE_OK != sqlite3_reset (stmt))
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_reset");
+  proc (proc_cls, NULL, 0, NULL, 0, 0, 0, GNUNET_TIME_UNIT_ZERO_ABS, 0);
+
+
+
+
+
+  const GNUNET_HashCode *key;
+  sqlite3_stmt *stmt;
+  int ret;
+
+  GNUNET_assert (proc != NULL);
+  if (sq_prepare (plugin->dbh, "SELECT hash FROM gn090", &stmt) != SQLITE_OK)
+  {
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+               "sqlite_prepare");
+    return;
+  }
+  while (SQLITE_ROW == (ret = sqlite3_step (stmt)))
+  {
+    key = sqlite3_column_blob (stmt, 1);
+    if (sizeof (GNUNET_HashCode) == sqlite3_column_bytes (stmt, 1))
+      proc (proc_cls, key, 1);
+  }
+  if (SQLITE_DONE != ret)
+    LOG_SQLITE (plugin, NULL, GNUNET_ERROR_TYPE_ERROR, "sqlite_step");
+  sqlite3_finalize (stmt);
+
+#endif
+  return 0;
+}
+
+ 
+/**
+ * Get a particular node from the signature tree.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone hash of public key of the zone
+ * @param loc location of the node in the signature tree
+ * @param cb function to call with the result
+ * @param cb_cls closure for cont
+ */
+static void
+namestore_sqlite_get_node (void *cls, 
+                          const GNUNET_HashCode *zone,
+                          const struct GNUNET_NAMESTORE_SignatureLocation *loc,
+                          GNUNET_NAMESTORE_NodeCallback cb, void *cb_cls)
+{
+}
+
+
+/**
+ * Get the current signature for a zone.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone hash of public key of the zone
+ * @param cb function to call with the result
+ * @param cb_cls closure for cont
+ */
+static void 
+namestore_sqlite_get_signature (void *cls, 
+                               const GNUNET_HashCode *zone,
+                               GNUNET_NAMESTORE_SignatureCallback cb, void 
*cb_cls)
+{
+}
+
+
+/**
+ * Delete an entire zone (all revisions, all records, all nodes,
+ * all signatures).  Not used in normal operation.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param zone zone to delete
+ */
+static void 
+namestore_sqlite_delete_zone (void *cls,
+                             const GNUNET_HashCode *zone)
+{
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls the "struct GNUNET_NAMESTORE_PluginEnvironment*"
+ * @return NULL on error, othrewise the plugin context
+ */
+void *
+libgnunet_plugin_namestore_sqlite_init (void *cls)
+{
+  static struct Plugin plugin;
+  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
+  struct GNUNET_NAMESTORE_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_malloc (sizeof (struct GNUNET_NAMESTORE_PluginFunctions));
+  api->cls = &plugin;
+  api->put_record = &namestore_sqlite_put_record;
+  api->put_node = &namestore_sqlite_put_node;
+  api->put_signature = &namestore_sqlite_put_signature;
+  api->iterate_records = &namestore_sqlite_iterate_records;
+  api->get_node = &namestore_sqlite_get_node;
+  api->get_signature = &namestore_sqlite_get_signature;
+  api->delete_zone = &namestore_sqlite_delete_zone;
+  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_namestore_sqlite_done (void *cls)
+{
+  struct GNUNET_NAMESTORE_PluginFunctions *api = cls;
+  struct Plugin *plugin = api->cls;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "sqlite plugin is done\n");
+  database_shutdown (plugin);
+  plugin->cfg = NULL;
+  GNUNET_free (api);
+  LOG (GNUNET_ERROR_TYPE_DEBUG, 
+       "sqlite plugin is finished\n");
+  return NULL;
+}
+
+/* end of plugin_namestore_sqlite.c */