plugin_peerstore_sqlite.c

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/*
 * 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
 */
 
#include "platform.h"
#include "gnunet_peerstore_plugin.h"
#include "gnunet_peerstore_service.h"
#include "gnunet_sq_lib.h"
#include "peerstore.h"
#include <sqlite3.h>
 
#define BUSY_TIMEOUT_MS 1000
 
#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__)
 
struct Plugin
{
  const struct GNUNET_CONFIGURATION_Handle *cfg;
 
  char *fn;
 
  sqlite3 *dbh;
 
  sqlite3_stmt *insert_peerstoredata;
 
  sqlite3_stmt *select_peerstoredata;
 
  sqlite3_stmt *select_peerstoredata_by_pid;
 
  sqlite3_stmt *select_peerstoredata_by_key;
 
  sqlite3_stmt *select_peerstoredata_by_all;
 
  sqlite3_stmt *expire_peerstoredata;
 
  sqlite3_stmt *delete_peerstoredata;
};
 
 
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;
}
 
 
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;
}
 
 
static int
peerstore_sqlite_iterate_records (void *cls,
                                  const char *sub_system,
                                  const struct GNUNET_PeerIdentity *peer,
                                  const char *key,
                                  GNUNET_PEERSTORE_Processor iter,
                                  void *iter_cls)
{
  struct Plugin *plugin = cls;
  sqlite3_stmt *stmt;
  int err = 0;
  int sret;
  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_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_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_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_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;
  while (SQLITE_ROW == (sret = sqlite3_step (stmt)))
  {
    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "Returning a matched record.\n");
    struct GNUNET_SQ_ResultSpec rs[] = {
      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,
            &rec,
            NULL);
    GNUNET_SQ_cleanup_result (rs);
  }
  if (SQLITE_DONE != sret)
  {
    LOG_SQLITE (plugin,
                GNUNET_ERROR_TYPE_ERROR,
                "sqlite_step");
    err = 1;
  }
  GNUNET_SQ_reset (plugin->dbh,
                   stmt);
  if (NULL != iter)
    iter (iter_cls,
          NULL,
          err ? "sqlite error" : NULL);
  return GNUNET_OK;
}
 
 
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 = plugin->insert_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_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);
  }
  if (GNUNET_OK !=
      GNUNET_SQ_bind (stmt,
                      params))
    LOG_SQLITE (plugin,
                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
                "sqlite3_bind");
  else 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;
}
 
 
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;
}
 
 
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;
}
 
 
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"
            "  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)",
                    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 sub_system,peer_id,key,value,expiry FROM peerstoredata"
               " WHERE sub_system = ?",
               &plugin->select_peerstoredata);
  sql_prepare (plugin->dbh,
               "SELECT sub_system,peer_id,key,value,expiry FROM peerstoredata"
               " WHERE sub_system = ?"
               " AND peer_id = ?",
               &plugin->select_peerstoredata_by_pid);
  sql_prepare (plugin->dbh,
               "SELECT sub_system,peer_id,key,value,expiry FROM peerstoredata"
               " WHERE sub_system = ?"
               " AND key = ?",
               &plugin->select_peerstoredata_by_key);
  sql_prepare (plugin->dbh,
               "SELECT sub_system,peer_id,key,value,expiry FROM peerstoredata"
               " WHERE sub_system = ?"
               " AND peer_id = ?" " AND key = ?",
               &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;
}
 
 
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);
}
 
 
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;
}
 
 
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 */