Starts a LevelDB index scan and returns a Promise for the list of results.

@param {LevelDB} leveldb The DB to scan.
@param {Object} options An options object passed verbatim to
leveldb.createKeyStream().
@return {Promise<Object[]>} The scan results.
15201
function scanIndex(leveldb, options) {
  return new P(function(resolve, reject) {
    var datas = [];
    var resolved = false;
    function fin() {
      if (resolved) {
        return;
      }
      resolve(P.all(datas));
      resolved = true;
    }
    leveldb.createKeyStream(options)
      .on('data', function(key) {
        var i = key.lastIndexOf('\x00');
        var key = key.substr(i + 1);
        datas.push(leveldb.getAsync(key));
      })
      .on('close', fin)
      .on('end', fin)
      .on('error', function(err) {
        reject(err);
      })
  });
}
98429
function(floors, options, callback) {
                if(floors && options && options.ascending === false) {
                    levelController.saveCurrentLevel(Level.create(options.identifierRange.min), function(error) {
                        if(error) {
                            logger.error('>>>> Stuck at floor ' + options.identifierRange.min + '. Failed to store the current level.');
                        }
                        return callback(error);
                    });                    
                } else {
                    return callback(null);
                }
            }
1217398
function runStep(step) 
{
  switch (step) {
    case 1 : 
      trace("-- Beginning benchmark --");
      initializeDB();
      initializeUnique();
      setTimeout(function() { runStep(2); }, 100);
      break;
    case 2 : 
      benchGet();
      setTimeout(function() { runStep(3); }, 100);
      break;
    case 3 :
      benchUniquePerf();
      setTimeout(function() { runStep(4); }, 100);
      trace("");
      trace("-- Benchmarking query on non-indexed column --");
      break;
    case 4 : 
      benchFind();	// find benchmark on unindexed customid field
      setTimeout(function() { runStep(5); }, 100);
      break;
    case 5 : 
      benchRS(); // resultset find benchmark on unindexed customid field
      setTimeout(function() { runStep(6); }, 100);
      break;
    case 6 : 
      benchDV();
      setTimeout(function() { runStep(7); }, 100);
      trace("");
      trace("-- Adding Binary Index to query column and repeating benchmarks --");
      break;
    case 7 : 
      samplecoll.ensureIndex("customId");
      setTimeout(function() { runStep(8); }, 100);
      break;
    case 8 : 
      benchFind(20);
      setTimeout(function() { runStep(9); }, 100);
      break;
    case 9 : 
      benchRS(15);
      setTimeout(function() { runStep(10); }, 100);
      break;
    case 10 : 
      benchDV(15);
      trace("");
      trace("done.");
      break;
  }
}
1116213
function LevelTable(levelDb, options) {
  if (!(this instanceof LevelTable)) return new LevelTable(levelDb, options)
  if (!levelDb) throw new Error("I need a levelDb!")
  var db = sublevel(levelDb)
  this.db = db.sublevel(options.prefix || "levelThrottle")
}
866570
function _initStorage(options) {
    var self = this;
    var dbInfo = {
        db: null
    };

    if (options) {
        for (var i in options) {
            dbInfo[i] = options[i];
        }
    }

    // Get the current context of the database;
    var dbContext = dbContexts[dbInfo.name];

    // ...or create a new context.
    if (!dbContext) {
        dbContext = createDbContext();
        // Register the new context in the global container.
        dbContexts[dbInfo.name] = dbContext;
    }

    // Register itself as a running localForage in the current context.
    dbContext.forages.push(self);

    // Replace the default `ready()` function with the specialized one.
    if (!self._initReady) {
        self._initReady = self.ready;
        self.ready = _fullyReady;
    }

    // Create an array of initialization states of the related localForages.
    var initPromises = [];

    function ignoreErrors() {
        // Don't handle errors here,
        // just makes sure related localForages aren't pending.
        return Promise$1.resolve();
    }

    for (var j = 0; j < dbContext.forages.length; j++) {
        var forage = dbContext.forages[j];
        if (forage !== self) {
            // Don't wait for itself...
            initPromises.push(forage._initReady()["catch"](ignoreErrors));
        }
    }

    // Take a snapshot of the related localForages.
    var forages = dbContext.forages.slice(0);

    // Initialize the connection process only when
    // all the related localForages aren't pending.
    return Promise$1.all(initPromises).then(function () {
        dbInfo.db = dbContext.db;
        // Get the connection or open a new one without upgrade.
        return _getOriginalConnection(dbInfo);
    }).then(function (db) {
        dbInfo.db = db;
        if (_isUpgradeNeeded(dbInfo, self._defaultConfig.version)) {
            // Reopen the database for upgrading.
            return _getUpgradedConnection(dbInfo);
        }
        return db;
    }).then(function (db) {
        dbInfo.db = dbContext.db = db;
        self._dbInfo = dbInfo;
        // Share the final connection amongst related localForages.
        for (var k = 0; k < forages.length; k++) {
            var forage = forages[k];
            if (forage !== self) {
                // Self is already up-to-date.
                forage._dbInfo.db = dbInfo.db;
                forage._dbInfo.version = dbInfo.version;
            }
        }
    });
}
1229843
function _initStorage(options) {
	        var self = this;
	        var dbInfo = {
	            db: null
	        };

	        if (options) {
	            for (var i in options) {
	                dbInfo[i] = typeof options[i] !== 'string' ? options[i].toString() : options[i];
	            }
	        }

	        var dbInfoPromise = new Promise(function (resolve, reject) {
	            // Open the database; the openDatabase API will automatically
	            // create it for us if it doesn't exist.
	            try {
	                dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version), dbInfo.description, dbInfo.size);
	            } catch (e) {
	                return self.setDriver(self.LOCALSTORAGE).then(function () {
	                    return self._initStorage(options);
	                }).then(resolve)['catch'](reject);
	            }

	            // Create our key/value table if it doesn't exist.
	            dbInfo.db.transaction(function (t) {
	                t.executeSql('CREATE TABLE IF NOT EXISTS ' + dbInfo.storeName + ' (id INTEGER PRIMARY KEY, key unique, value)', [], function () {
	                    self._dbInfo = dbInfo;
	                    resolve();
	                }, function (t, error) {
	                    reject(error);
	                });
	            });
	        });

	        return new Promise(function (resolve, reject) {
	            resolve(__webpack_require__(3));
	        }).then(function (lib) {
	            dbInfo.serializer = lib;
	            return dbInfoPromise;
	        });
	    }
638369
function execute(req, res) {
  //console.dir(req.args);
  var hmap = req.db.getKey(req.args[0], req);
  if(hmap === undefined) {
    return res.send(null, [0, []]);
  }
  //console.dir(hmap.getKeys())
  var scanner = new Scanner(
    hmap.getKeys(),
    req.info.cursor,
    req.info.pattern,
    req.info.count,
    hmap.data);

  scanner.scan(req, res);
}
1276035
function getDatabase(callback) {
    node.log(`Getting database:\n${dbName}\n`);
    var dbdef = {id : dbName};
        return new Promise((resolve, reject) => {
            client.readDatabase(databaseUrl, (err, result) => {
                if (err) {
                    if (err.code == HttpStatusCodes.NOTFOUND) {
                        client.createDatabase(dbdef, (err, created) => {
                            if (err) reject(err)
                            else resolve(created);
                        });
                    } else {
                        reject(err);
                    }
                } else {
                    resolve(result);
                }
            });
        });
    }
99281
function createReader(db, options) {
  if (options == null) options = {}

  var iterator = db.iterator(options)

  function _read(n) {
    // ignore n for now

    var self = this
    iterator.next(function (err, key, value) {
      if (err) {
        iterator.end(noop)
        self.emit("error", err)
        return
      }
      if (key == null && value == null) {
        iterator.end(noop)
        self.push(null)
        return
      }

      var record = multibuffer.pack([key, value])
      self.push(record)
    })
  }

  return spigot(_read)
}
274394
function listRecords(options) {
    return getZone(options.domain).then(function (zone) {
      return self.cloudflareClient.findRecord(zone.id, {page: 1, per_page: self.perPage})
        .then(function (response) {
          let promises = [Promise.resolve(response)];
          for (let i = 2; i <= response.data['result_info']['total_pages']; i++) {
            promises.push(self.cloudflareClient.findRecord(zone.id, {page: i, per_page: self.perPage}));
          }
          return Promise.all(promises);
        });
    }).then(function (responses) {
      let rows = [];
      _.each(responses, function (response) {
        _.each(response.data.result, function (item) {
          item.ttl = (item.ttl === 1) ? 'Auto' : item.ttl;
          rows.push(item);
        });
      });
      return new Result(rows);
    });
  }
425486
function openDatabase() {
    return new Promise((resolve, reject) => {
      var request = indexedDB.open(dbName, dbVersion);
      request.onerror = reject.bind(null, 'Error opening wasm cache database');
      request.onsuccess = () => { resolve(request.result) };
      request.onupgradeneeded = event => {
        var db = request.result;
        if (db.objectStoreNames.contains(storeName)) {
            console.log(`Clearing out version ${event.oldVersion} wasm cache`);
            db.deleteObjectStore(storeName);
        }
        console.log(`Creating version ${event.newVersion} wasm cache`);
        db.createObjectStore(storeName)
      };
    });
  }
549847
function getConnection(options) {
  debug('getConnection','start',options);

  let key = null;
  let promise = null;
  try {
    //clone options
    options = clone(options);

    //serialize the options as a key for pools
    key = stringify(options || {});

    //if there's already a promise for the given connection, return it
    if (promises[key]) return promises[key];

    //create a new promise for the given connection options
    promise = promises[key] = createConnectionPromise(key, options);

    debug('getConnection','success')
    return promise;
  } catch(err) {
    debug('getConnection','error',err);
    return Promise.reject(err);
  }
}
163494
function Connection(options) {
  //*****************************************************************
  // public API functions
  //*****************************************************************

  /**
   * Connect event
   *
   * @returns {Promise} promise
   */
  this.connect = () => {
    switch (_status) {
      case Status.NOT_CONNECTED:
        _status = Status.CONNECTING;
        return new Promise(function(resolve, reject) {
          _registerHandshakeCmd(resolve, reject);
        });

      case Status.CLOSING:
      case Status.CLOSED:
        return Promise.reject(
          Errors.createError(
            'Connection closed',
            true,
            info,
            '08S01',
            Errors.ER_CONNECTION_ALREADY_CLOSED
          )
        );

      case Status.CONNECTING:
      case Status.AUTHENTICATING:
        return Promise.reject(
          Errors.createError(
            'Connection is already connecting',
            true,
            info,
            '08S01',
            Errors.ER_ALREADY_CONNECTING
          )
        );
    }
    //status Connected
    return Promise.resolve(this);
  };

  /**
   * Permit to change user during connection.
   * All user variables will be reset, Prepare commands will be released.
   * !!! mysql has a bug when CONNECT_ATTRS capability is set, that is default !!!!
   *
   * @param options   connection options
   * @returns {Promise} promise
   */
  this.changeUser = options => {
    if (!info.isMariaDB()) {
      return Promise.reject(
        Errors.createError(
          'method changeUser not available for MySQL server due to Bug #83472',
          false,
          info,
          '0A000',
          Errors.ER_MYSQL_CHANGE_USER_BUG
        )
      );
    }

    return new Promise(function(resolve, reject) {
      _addCommand(
        new ChangeUser(
          options,
          resolve,
          _authFailHandler.bind(this, reject),
          _addCommand.bind(this)
        )
      );
    });
  };

  /**
   * Start transaction
   *
   * @returns {Promise} promise
   */
  this.beginTransaction = () => {
    return this.query('START TRANSACTION');
  };

  /**
   * Commit a transaction.
   *
   * @returns {Promise} command if commit was needed only
   */
  this.commit = () => {
    return _changeTransaction('COMMIT');
  };

  /**
   * Roll back a transaction.
   *
   * @returns {Promise} promise
   */
  this.rollback = () => {
    return _changeTransaction('ROLLBACK');
  };

  /**
   * Execute query using text protocol.
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @returns {Promise} promise
   */
  this.query = (sql, values) => {
    let _cmdOpt, _sql;
    if (typeof sql === 'object') {
      _cmdOpt = sql;
      _sql = _cmdOpt.sql;
    } else {
      _sql = sql;
    }

    return new Promise(function(resolve, reject) {
      const cmd = new Query(resolve, reject, _cmdOpt, opts, _sql, values);
      if (opts.trace) Error.captureStackTrace(cmd);
      _addCommand(cmd);
    });
  };

  /**
   * Execute batch using text protocol.
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param initialValues  object / array of placeholder values (not mandatory)
   * @returns {Promise} promise
   */
  this.batch = (sql, initialValues) => {
    let _options, _sql;
    if (typeof sql === 'object') {
      _options = sql;
      _sql = _options.sql;
    } else {
      _sql = sql;
    }

    return new Promise(function(resolve, reject) {
      let useBulk = canUseBulk(initialValues);

      const cmd = useBulk
        ? new BatchBulk(resolve, reject, _options, opts, _sql, initialValues)
        : new BatchRewrite(
            resolve,
            reject,
            _options,
            opts,
            _sql,
            initialValues
          );
      if (opts.trace) Error.captureStackTrace(cmd);
      _addCommand(cmd);
    });
  };

  /**
   * Execute query returning a Readable Object that will emit columns/data/end/error events
   * to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @returns {Readable}
   */
  this.queryStream = (sql, values) => {
    let _cmdOpt, _sql;
    if (typeof sql === 'object') {
      _cmdOpt = sql;
      _sql = _cmdOpt.sql;
    } else {
      _sql = sql;
    }

    const cmd = new Stream(_cmdOpt, opts, _sql, values, _socket);
    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd.inStream;
  };

  /**
   * Send an empty MySQL packet to ensure connection is active, and reset @@wait_timeout
   *
   * @returns {Promise} promise
   */
  this.ping = () => {
    return new Promise(function(resolve, reject) {
      return _addCommand(new Ping(resolve, reject));
    });
  };

  /**
   * Send a reset command that will
   * - rollback any open transaction
   * - reset transaction isolation level
   * - reset session variables
   * - delete user variables
   * - remove temporary tables
   * - remove all PREPARE statement
   *
   * @returns {Promise} promise
   */
  this.reset = () => {
    if (
      (info.isMariaDB() && info.hasMinVersion(10, 2, 4)) ||
      (!info.isMariaDB() && info.hasMinVersion(5, 7, 3))
    ) {
      return new Promise(function(resolve, reject) {
        return _addCommand(new Reset(resolve, reject));
      });
    }
    return Promise.reject(
      new Error(
        'Reset command not permitted for server ' + this.info.serverVersion
      )
    );
  };

  /**
   * Indicates the state of the connection as the driver knows it
   * @returns {boolean}
   */
  this.isValid = () => {
    return _status === Status.CONNECTED;
  };

  /**
   * Terminate connection gracefully.
   *
   * @returns {Promise} promise
   */
  this.end = () => {
    _addCommand = _addCommandDisabled;
    clearTimeout(_timeout);

    if (
      _status !== Status.CLOSING &&
      _status !== Status.CLOSED &&
      _status !== Status.NOT_CONNECTED
    ) {
      _status = Status.CLOSING;
      return new Promise(function(resolve, reject) {
        const ended = () => {
          _status = Status.CLOSED;
          _socket.destroy();
          _socket.unref();
          _clear();
          _receiveQueue.clear();
          resolve();
        };
        const quitCmd = new Quit(ended, ended);
        _sendQueue.push(quitCmd);
        _receiveQueue.push(quitCmd);
        if (_sendQueue.length === 1) {
          process.nextTick(_nextSendCmd.bind(this));
        }
      });
    }
    return Promise.resolve();
  };

  /**
   * Alias for destroy.
   */
  this.close = function() {
    this.destroy();
  };

  /**
   * Force connection termination by closing the underlying socket and killing server process if any.
   */
  this.destroy = () => {
    _addCommand = _addCommandDisabled;
    clearTimeout(_timeout);
    if (_status !== Status.CLOSING && _status !== Status.CLOSED) {
      _status = Status.CLOSING;
      _sendQueue.clear();
      if (_receiveQueue.length > 0) {
        //socket is closed, but server may still be processing a huge select
        //only possibility is to kill process by another thread
        //TODO reuse a pool connection to avoid connection creation
        const self = this;
        const killCon = new Connection(opts);
        killCon
          .connect()
          .then(() => {
            //*************************************************
            //kill connection
            //*************************************************
            const killResHandler = () => {
              const destroyError = Errors.createError(
                'Connection destroyed, command was killed',
                true,
                info,
                '08S01',
                Errors.ER_CMD_NOT_EXECUTED_DESTROYED
              );
              socketErrorDispatchToQueries(destroyError);
              process.nextTick(() => {
                if (_socket) _socket.destroy();
              });
              _status = Status.CLOSED;
              killCon.end().catch(() => {});
            };

            killCon
              .query('KILL ' + info.threadId)
              .then(killResHandler)
              .catch(killResHandler);
          })
          .catch(err => {
            //*************************************************
            //failing to create a kill connection, end normally
            //*************************************************
            const ended = () => {
              let sock = _socket;
              _clear();
              _status = Status.CLOSED;
              setImmediate(resolve);
              sock.destroy();
              _receiveQueue.clear();
            };
            const quitCmd = new Quit(ended, ended);
            _sendQueue.push(quitCmd);
            _receiveQueue.push(quitCmd);
            if (_sendQueue.length === 1) {
              process.nextTick(_nextSendCmd.bind(self));
            }
          });
      } else {
        _status = Status.CLOSED;
        _socket.destroy();
      }
    }
    _clear();
  };

  this.pause = () => {
    _socket.pause();
  };

  this.resume = () => {
    _socket.resume();
  };

  this.escape = value => {
    throw Errors.createError(
      '"Connection.escape intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_ESCAPE
    );
  };

  this.escapeId = value => {
    throw Errors.createError(
      '"Connection.escapeId intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_ESCAPEID
    );
  };

  this.format = (sql, values) => {
    throw Errors.createError(
      '"Connection.format intentionally not implemented. please use Connection.query(sql, values), it will be more secure and faster',
      false,
      info,
      '0A000',
      Errors.ER_NOT_IMPLEMENTED_FORMAT
    );
  };

  //*****************************************************************
  // additional public methods
  //*****************************************************************

  /**
   * return current connected server version information.
   *
   * @returns {*}
   */
  this.serverVersion = () => {
    if (!info.serverVersion)
      throw new Error(
        'cannot know if server information until connection is established'
      );
    return info.serverVersion.raw;
  };

  /**
   * Change option "debug" during connection.
   * @param val   debug value
   */
  this.debug = val => {
    opts.debug = val;
  };

  this.debugCompress = val => {
    opts.debugCompress = val;
  };

  //*****************************************************************
  // internal public testing methods
  //*****************************************************************

  function TestMethods() {}
  TestMethods.prototype.getCollation = () => {
    return opts.collation;
  };

  TestMethods.prototype.getSocket = () => {
    return _socket;
  };

  this.__tests = new TestMethods();

  //*****************************************************************
  // internal methods
  //*****************************************************************

  this._status = () => {
    return _status;
  };

  /**
   * Execute query using text protocol with callback emit columns/data/end/error
   * events to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @param cb      callback
   * @returns {Query} query
   */
  this._queryCallback = (sql, values, cb) => {
    let _cmdOpts, _sql, _values;
    let _cb = cb;
    if (typeof sql === 'object') {
      _cmdOpts = sql;
      _sql = _cmdOpts.sql;
    } else {
      _sql = sql;
    }

    if (typeof values === 'function') {
      _cb = values;
    } else if (values !== undefined) {
      _values = values;
    }

    let cmd;
    if (_cb) {
      const resolve = rows => {
        const meta = rows.meta;
        delete rows.meta;
        _cb(null, rows, meta);
      };
      cmd = new Query(resolve, _cb, _cmdOpts, opts, _sql, _values);
    } else {
      cmd = new Query(() => {}, () => {}, _cmdOpts, opts, _sql, _values);
    }
    cmd.handleNewRows = row => {
      cmd._rows[cmd._responseIndex].push(row);
      cmd.emit('data', row);
    };

    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd;
  };

  /**
   * Execute a batch using text protocol with callback emit columns/data/end/error
   * events to permit streaming big result-set
   *
   * @param sql     sql parameter Object can be used to supersede default option.
   *                Object must then have sql property.
   * @param values  object / array of placeholder values (not mandatory)
   * @param cb      callback
   * @returns {Query} query
   */
  this._batchCallback = (sql, values, cb) => {
    let _cmdOpts, _sql, _values;
    let _cb = cb;
    if (typeof sql === 'object') {
      _cmdOpts = sql;
      _sql = _cmdOpts.sql;
    } else {
      _sql = sql;
    }

    if (typeof values === 'function') {
      _cb = values;
    } else if (values !== undefined) {
      _values = values;
    }

    let cmd;

    let useBulk = canUseBulk(_values);

    const fct = useBulk ? BatchBulk : BatchRewrite;

    if (_cb) {
      const resolve = rows => {
        const meta = rows.meta;
        delete rows.meta;
        _cb(null, rows, meta);
      };
      cmd = new fct(resolve, _cb, _cmdOpts, opts, _sql, _values);
    } else {
      cmd = new fct(() => {}, () => {}, _cmdOpts, opts, _sql, _values);
    }
    cmd.handleNewRows = row => {
      cmd._rows[cmd._responseIndex].push(row);
      cmd.emit('data', row);
    };

    if (opts.trace) Error.captureStackTrace(cmd);
    _addCommand(cmd);
    return cmd;
  };

  /**
   * Use Batch rewrite or MariaDB bulk protocol.
   *
   * @param _values current batch values
   * @return {boolean} indicating if must use rewrite or bulk
   */
  const canUseBulk = _values => {
    let useBulk = info.isMariaDB() && info.hasMinVersion(10, 2, 7) && opts.bulk;
    if (useBulk) {
      //ensure that there is no stream object
      if (_values !== undefined) {
        const values = Array.isArray(_values) ? _values : [_values];
        const paramLen = Array.isArray(values[0]) ? values[0].length : 1;
        if (!opts.namedPlaceholders) {
          for (let r = 0; r < values.length; r++) {
            let row = values[r];
            if (!Array.isArray(row)) row = [row];
            if (paramLen !== row.length) {
              useBulk = false;
              break;
            }
            for (let j = 0; j < paramLen; j++) {
              const val = row[j];
              if (
                val !== null &&
                typeof val === 'object' &&
                typeof val.pipe === 'function' &&
                typeof val.read === 'function'
              ) {
                useBulk = false;
                break;
              }
            }
            if (!useBulk) break;
          }
        } else {
          for (let r = 0; r < values.length; r++) {
            let row = values[r];
            const keys = Object.keys(row);
            for (let j = 0; j < keys.length; j++) {
              const val = row[keys[j]];
              if (
                val !== null &&
                typeof val === 'object' &&
                typeof val.pipe === 'function' &&
                typeof val.read === 'function'
              ) {
                useBulk = false;
                break;
              }
            }
            if (!useBulk) break;
          }
        }
      }
    }
    return useBulk;
  };

  /**
   * Add handshake command to queue.
   *
   * @private
   */
  const _registerHandshakeCmd = (resolve, rejected) => {
    const _authFail = _authFailHandler.bind(this, rejected);
    const _authSucceed = _authSucceedHandler.bind(this, resolve, _authFail);

    const handshake = new Handshake(
      _authSucceed,
      _authFail,
      _createSecureContext.bind(this, _authFail),
      _addCommand.bind(this),
      _getSocket
    );
    Error.captureStackTrace(handshake);

    handshake.once('end', () => {
      process.nextTick(_nextSendCmd);
    });

    _receiveQueue.push(handshake);
    _initSocket(_authFail);
  };

  const _executeSessionVariableQuery = () => {
    if (opts.sessionVariables) {
      const values = [];
      let sessionQuery = 'set ';
      let keys = Object.keys(opts.sessionVariables);
      if (keys.length > 0) {
        return new Promise(function(resolve, reject) {
          for (let k = 0; k < keys.length; ++k) {
            sessionQuery +=
              (k !== 0 ? ',' : '') +
              '@@' +
              keys[k].replace(/[^a-z0-9_]/gi, '') +
              '=?';
            values.push(opts.sessionVariables[keys[k]]);
          }
          const errorHandling = initialErr => {
            reject(
              Errors.createError(
                'Error setting session variable (value ' +
                  JSON.stringify(opts.sessionVariables) +
                  '). Error: ' +
                  initialErr.message,
                true,
                info,
                '08S01',
                Errors.ER_SETTING_SESSION_ERROR,
                null
              )
            );
          };
          const cmd = new Query(
            resolve,
            errorHandling,
            null,
            opts,
            sessionQuery,
            values
          );
          if (opts.trace) Error.captureStackTrace(cmd);
          _addCommand(cmd);
        });
      }
    }
    return Promise.resolve();
  };

  /**
   * Asking server timezone if not set
   * @returns {Promise<void>|Promise<T | never>}
   * @private
   */
  const _checkServerTimezone = () => {
    if (opts.timezone === 'local' || opts.tz) {
      return Promise.resolve();
    }
    return this.query('SELECT @@system_time_zone stz, @@time_zone tz').then(
      res => {
        const serverTimezone = res[0].tz === 'SYSTEM' ? res[0].stz : res[0].tz;
        const serverZone = moment.tz.zone(serverTimezone);
        if (serverZone) {
          if (serverTimezone === moment.tz.guess()) {
            //db server and client use same timezone, avoid any conversion
            opts.tz = null;
          } else {
            opts.tz = moment.tz.setDefault(serverTimezone);
          }
        } else {
          return Promise.reject(
            Errors.createError(
              "Automatic timezone setting fails. Server timezone '" +
                serverTimezone +
                "' does't have a corresponding IANA timezone. Option timezone must be set according to server timezone",
              true,
              info,
              '08S01',
              Errors.ER_WRONG_AUTO_TIMEZONE
            )
          );
        }
        return Promise.resolve();
      }
    );
  };

  const _executeInitQuery = () => {
    if (opts.initSql) {
      const initialArr = Array.isArray(opts.initSql)
        ? opts.initSql
        : [opts.initSql];
      const initialPromises = [];
      initialArr.forEach(sql => {
        initialPromises.push(
          new Promise(function(resolve, reject) {
            const errorHandling = initialErr => {
              reject(
                Errors.createError(
                  'Error executing initial sql command: ' + initialErr.message,
                  true,
                  info,
                  '08S01',
                  Errors.ER_INITIAL_SQL_ERROR,
                  null
                )
              );
            };
            const cmd = new Query(
              resolve,
              errorHandling,
              null,
              opts,
              sql,
              null
            );
            if (opts.trace) Error.captureStackTrace(cmd);
            _addCommand(cmd);
          })
        );
      });
      return Promise.all(initialPromises);
    }
    return Promise.resolve();
  };

  const _getSocket = () => {
    return _socket;
  };

  /**
   * Initialize socket and associate events.
   * @private
   */
  const _initSocket = authFailHandler => {
    if (opts.socketPath) {
      _socket = Net.connect(opts.socketPath);
    } else {
      _socket = Net.connect(opts.port, opts.host);
    }

    if (opts.connectTimeout) {
      _timeout = setTimeout(
        _connectTimeoutReached,
        opts.connectTimeout,
        authFailHandler
      );
    }

    const _socketError = _socketErrorHandler.bind(this, authFailHandler);

    _socket.on('data', _in.onData.bind(_in));
    _socket.on('error', _socketError);
    _socket.on('end', _socketError);
    _socket.on(
      'connect',
      function() {
        clearTimeout(_timeout);
        if (_status === Status.CONNECTING) {
          _status = Status.AUTHENTICATING;
          _socketConnected = true;
          _socket.setTimeout(
            opts.socketTimeout,
            _socketTimeoutReached.bind(this, authFailHandler)
          );
          _socket.setNoDelay(true);
        }
      }.bind(this)
    );

    _socket.writeBuf = _socket.write;
    _socket.flush = () => {};
    _out.setStream(_socket);
  };

  /**
   * Authentication success result handler.
   *
   * @private
   */
  const _authSucceedHandler = (resolve, rejected) => {
    //enable packet compression according to option
    if (opts.logPackets) info.enableLogPacket();
    if (opts.compress) {
      if (info.serverCapabilities & Capabilities.COMPRESS) {
        _out.setStream(new CompressionOutputStream(_socket, opts, info));
        _in = new CompressionInputStream(_in, _receiveQueue, opts, info);
        _socket.removeAllListeners('data');
        _socket.on('data', _in.onData.bind(_in));
      } else {
        console.error(
          "connection is configured to use packet compression, but the server doesn't have this capability"
        );
      }
    }

    if (opts.pipelining) {
      _addCommand = _addCommandEnablePipeline;
      const commands = _receiveQueue.toArray();
      commands.forEach(cmd => {
        const listeners = cmd.listeners('end');
        cmd.removeListener('end', listeners[0]);
        cmd.once('send_end', () => {
          setImmediate(_nextSendCmd);
        });
      });
    }

    const errorInitialQueries = err => {
      if (!err.fatal) this.end().catch(err => {});
      process.nextTick(rejected, err);
    };

    _executeSessionVariableQuery()
      .then(() => {
        return _checkServerTimezone();
      })
      .then(() => {
        return _executeInitQuery();
      })
      .then(() => {
        _status = Status.CONNECTED;
        process.nextTick(resolve, this);
      })
      .catch(errorInitialQueries);
  };

  /**
   * Authentication failed result handler.
   *
   * @private
   */
  const _authFailHandler = (reject, err) => {
    process.nextTick(reject, err);
    //remove handshake command
    _receiveQueue.shift();

    _fatalError(err, true);
  };

  /**
   * Create TLS socket and associate events.
   *
   * @param rejected  rejected function when error
   * @param callback  callback function when done
   * @private
   */
  const _createSecureContext = (rejected, callback) => {
    const _socketError = _socketErrorHandler.bind(this, rejected);
    const sslOption = Object.assign({}, opts.ssl, {
      servername: opts.host,
      socket: _socket
    });

    try {
      const secureSocket = tls.connect(sslOption, callback);

      secureSocket.on('data', _in.onData.bind(_in));
      secureSocket.on('error', _socketError);
      secureSocket.on('end', _socketError);
      secureSocket.writeBuf = secureSocket.write;
      secureSocket.flush = () => {};

      _socket.removeAllListeners('data');
      _socket = secureSocket;

      _out.setStream(secureSocket);
    } catch (err) {
      _socketError(err);
    }
  };

  /**
   * Handle packet when no packet is expected.
   * (there can be an ERROR packet send by server/proxy to inform that connection is ending).
   *
   * @param packet  packet
   * @private
   */
  const _unexpectedPacket = function(packet) {
    if (packet && packet.peek() === 0xff) {
      //can receive unexpected error packet from server/proxy
      //to inform that connection is closed (usually by timeout)
      let err = packet.readError(info);
      if (
        err.fatal &&
        (_status !== Status.CLOSING && _status !== Status.CLOSED)
      ) {
        this.emit('error', err);
        this.end();
      }
    } else if (_status !== Status.CLOSING && _status !== Status.CLOSED) {
      this.emit(
        'error',
        Errors.createError(
          'receiving packet from server without active commands\n' +
            'conn:' +
            (info.threadId ? info.threadId : -1) +
            '(' +
            packet.pos +
            ',' +
            packet.end +
            ')\n' +
            Utils.log(opts, packet.buf, packet.pos, packet.end),
          true,
          info,
          '08S01',
          Errors.ER_UNEXPECTED_PACKET
        )
      );
      this.destroy();
    }
  };

  /**
   * Change transaction state.
   *
   * @param sql sql
   * @returns {Promise} promise
   * @private
   */
  const _changeTransaction = sql => {
    //if command in progress, driver cannot rely on status and must execute query
    if (_status === Status.CLOSING || _status === Status.CLOSED) {
      return Promise.reject(
        Errors.createError(
          'Cannot execute new commands: connection closed\nsql: ' + sql,
          true,
          info,
          '08S01',
          Errors.ER_CMD_CONNECTION_CLOSED
        )
      );
    }

    //Command in progress => must execute query
    //or if no command in progress, can rely on status to know if query is needed
    if (
      _receiveQueue.peekFront() ||
      info.status & ServerStatus.STATUS_IN_TRANS
    ) {
      return new Promise(function(resolve, reject) {
        const cmd = new Query(resolve, reject, null, opts, sql, null);
        if (opts.trace) Error.captureStackTrace(cmd);
        _addCommand(cmd);
      });
    }
    return Promise.resolve();
  };

  /**
   * Handle connection timeout.
   *
   * @private
   */
  const _connectTimeoutReached = function(authFailHandler) {
    _timeout = null;
    const handshake = _receiveQueue.peekFront();
    authFailHandler(
      Errors.createError(
        'Connection timeout',
        true,
        info,
        '08S01',
        Errors.ER_CONNECTION_TIMEOUT,
        handshake ? handshake.stack : null
      )
    );
  };

  /**
   * Handle socket timeout.
   *
   * @private
   */
  const _socketTimeoutReached = function() {
    const err = Errors.createError(
      'socket timeout',
      true,
      info,
      '08S01',
      Errors.ER_SOCKET_TIMEOUT
    );
    const packetMsgs = info.getLastPackets();
    if (packetMsgs !== '') {
      err.message = err.message + '\nlast received packets:\n' + packetMsgs;
    }
    _fatalError(err, true);
  };

  /**
   * Add command to command sending and receiving queue.
   *
   * @param cmd         command
   * @returns {*}       current command
   * @private
   */
  const _addCommandEnable = cmd => {
    cmd.once('end', () => {
      setImmediate(_nextSendCmd);
    });

    //send immediately only if no current active receiver
    if (_sendQueue.isEmpty() && _status === Status.CONNECTED) {
      if (_receiveQueue.peekFront()) {
        _receiveQueue.push(cmd);
        _sendQueue.push(cmd);
        return cmd;
      }

      _receiveQueue.push(cmd);
      cmd.start(_out, opts, info);
    } else {
      _receiveQueue.push(cmd);
      _sendQueue.push(cmd);
    }
    return cmd;
  };

  /**
   * Add command to command sending and receiving queue using pipelining
   *
   * @param cmd         command
   * @returns {*}       current command
   * @private
   */
  const _addCommandEnablePipeline = cmd => {
    cmd.once('send_end', () => {
      setImmediate(_nextSendCmd);
    });

    _receiveQueue.push(cmd);
    if (_sendQueue.isEmpty()) {
      cmd.start(_out, opts, info);
      if (cmd.sending) {
        _sendQueue.push(cmd);
        cmd.prependOnceListener('send_end', () => {
          _sendQueue.shift();
        });
      }
    } else {
      _sendQueue.push(cmd);
    }
    return cmd;
  };

  /**
   * Replacing command when connection is closing or closed to send a proper error message.
   *
   * @param cmd         command
   * @private
   */
  const _addCommandDisabled = cmd => {
    cmd.throwNewError(
      'Cannot execute new commands: connection closed\n' + cmd.displaySql(),
      true,
      info,
      '08S01',
      Errors.ER_CMD_CONNECTION_CLOSED
    );
  };

  /**
   * Handle socket error.
   *
   * @param authFailHandler   authentication handler
   * @param err               socket error
   * @private
   */
  const _socketErrorHandler = function(authFailHandler, err) {
    if (_status === Status.CLOSING || _status === Status.CLOSED) return;

    _socket.writeBuf = () => {};
    _socket.flush = () => {};

    //socket has been ended without error
    if (!err) {
      err = Errors.createError(
        'socket has unexpectedly been closed',
        true,
        info,
        '08S01',
        Errors.ER_SOCKET_UNEXPECTED_CLOSE
      );
    } else {
      err.fatal = true;
      this.sqlState = 'HY000';
    }

    const packetMsgs = info.getLastPackets();
    if (packetMsgs !== '') {
      err.message += '\nlast received packets:\n' + packetMsgs;
    }

    switch (_status) {
      case Status.CONNECTING:
      case Status.AUTHENTICATING:
        const currentCmd = _receiveQueue.peekFront();
        if (currentCmd && currentCmd.stack && err) {
          err.stack +=
            '\n From event:\n' +
            currentCmd.stack.substring(currentCmd.stack.indexOf('\n') + 1);
        }
        authFailHandler(err);
        break;

      default:
        _fatalError(err, false);
    }
  };

  /**
   * Fatal unexpected error : closing connection, and throw exception.
   *
   * @param self    current connection
   * @private
   */
  const _fatalErrorHandler = function(self) {
    return function(err, avoidThrowError) {
      if (_status === Status.CLOSING || _status === Status.CLOSED) {
        socketErrorDispatchToQueries(err);
        return;
      }
      const mustThrowError = _status !== Status.CONNECTING;
      _status = Status.CLOSING;

      //prevent executing new commands
      _addCommand = _addCommandDisabled;

      if (_socket) {
        _socket.removeAllListeners('error');
        _socket.removeAllListeners('timeout');
        _socket.removeAllListeners('close');
        _socket.removeAllListeners('data');
        if (!_socket.destroyed) _socket.destroy();
        _socket = undefined;
      }
      _status = Status.CLOSED;

      const errorThrownByCmd = socketErrorDispatchToQueries(err);
      if (mustThrowError) {
        if (self.listenerCount('error') > 0) {
          self.emit('error', err);
          self.emit('end');
          _clear();
        } else {
          self.emit('end');
          _clear();
          //error will be thrown if no error listener and no command did throw the exception
          if (!avoidThrowError && !errorThrownByCmd) throw err;
        }
      } else {
        _clear();
      }
    };
  };

  /**
   * Dispatch fatal error to current running queries.
   *
   * @param err        the fatal error
   * @return {boolean} return if error has been relayed to queries
   */
  const socketErrorDispatchToQueries = err => {
    let receiveCmd;
    let errorThrownByCmd = false;
    while ((receiveCmd = _receiveQueue.shift())) {
      if (receiveCmd && receiveCmd.onPacketReceive) {
        errorThrownByCmd = true;
        setImmediate(receiveCmd.throwError.bind(receiveCmd), err, info);
      }
    }
    return errorThrownByCmd;
  };

  /**
   * Will send next command in queue if any.
   *
   * @private
   */
  const _nextSendCmd = () => {
    let sendCmd;
    if ((sendCmd = _sendQueue.shift())) {
      if (sendCmd.sending) {
        _sendQueue.unshift(sendCmd);
      } else {
        sendCmd.start(_out, opts, info);
        if (sendCmd.sending) {
          sendCmd.prependOnceListener('send_end', () => {
            _sendQueue.shift();
          });
          _sendQueue.unshift(sendCmd);
        }
      }
    }
  };

  /**
   * Clearing connection variables when ending.
   *
   * @private
   */
  const _clear = () => {
    _sendQueue.clear();
    _out = undefined;
    _socket = undefined;
  };

  //*****************************************************************
  // internal variables
  //*****************************************************************

  EventEmitter.call(this);
  const opts = Object.assign({}, options);
  const info = new ConnectionInformation();
  const _sendQueue = new Queue();
  const _receiveQueue = new Queue();
  let _status = Status.NOT_CONNECTED;
  let _socketConnected = false;
  let _socket = null;
  let _timeout = null;
  let _addCommand = _addCommandEnable;
  const _fatalError = _fatalErrorHandler(this);
  let _out = new PacketOutputStream(opts, info);
  let _in = new PacketInputStream(
    _unexpectedPacket.bind(this),
    _receiveQueue,
    _out,
    opts,
    info
  );

  //add alias threadId for mysql/mysql2 compatibility
  Object.defineProperty(this, 'threadId', {
    get() {
      return info ? info.threadId : undefined;
    }
  });
  Object.defineProperty(this, 'info', {
    get() {
      return info;
    }
  });
}
1057304
function (db, indexName, facetDoc, query, cb) {
			var url = host + "databases/" + db + "/facets/" + indexName + "?facetDoc=" + facetDoc + "&query=" + encodeURIComponent(query);
			request(url, function (error, response, body) {
				if (!error && response.statusCode === 200) {
					var result = JSON.parse(body);
					_.each(result.Results, function (v, k) {
						if (_.filter(v.Values, function (x) {
							return x.Hits > 0;
						}).length < 2) {
							delete result.Results[k];
							return;
						}
						v.Values = _.chain(v.Values)
							.map(function (x) {
								var val = JSON.stringify(x.Range)
									.replace(/^\"|\"$/gi, "")
									.replace(/\:/gi, "\\:")
									.replace(/\(/gi, "\\(")
									.replace(/\)/gi, "\\)");
								if (x.Range.indexOf(" TO ") <= 0 || x.Range.indexOf("[") !== 0) {
									val = val.replace(/\ /gi, "\\ ");
								}
								val = encodeURIComponent(val);
								x.q = k + ":" + val;
								x.Range = x.Range
									.replace(/^\[Dx/, "")
									.replace(/ Dx/, " ")
									.replace(/\]$/, "")
									.replace(/ TO /, "-");
								return x;
							}).filter(function (x) {
								return x.Hits > 0;
							}).sortBy(function (x) {
								return x.Range;
							}).value();
					});
					cb(null, result.Results);
				} else
					cb(error || new Error(response.statusCode), null);
			});
		}
1052303
def _add_leveldb_option(config: ConfigParser, leveldb_fallback_dir: str) -> None:
        
        config.set("defaults", "#Default chaindata locations:", "")
        config.set("defaults", "#– Mac: ~/Library/Ethereum/geth/chaindata", "")
        config.set("defaults", "#– Linux: ~/.ethereum/geth/chaindata", "")
        config.set(
            "defaults",
            "#– Windows: %USERPROFILE%\\AppData\\Roaming\\Ethereum\\geth\\chaindata",
            "",
        )
        config.set("defaults", "leveldb_dir", leveldb_fallback_dir)
294496
function execute(req, res) {
  var scanner = new Scanner(
    req.db.getKeys(), req.info.cursor, req.info.pattern, req.info.count);
  scanner.scan(req, res);
}
137600
function() {
        if (!this._disconnected) {
            console.log(
                `LocalIndexedDBStoreBackend.connect: already connected or connecting`,
            );
            return Promise.resolve();
        }

        this._disconnected = false;

        console.log(
            `LocalIndexedDBStoreBackend.connect: connecting...`,
        );
        const req = this.indexedDB.open(this._dbName, VERSION);
        req.onupgradeneeded = (ev) => {
            const db = ev.target.result;
            const oldVersion = ev.oldVersion;
            console.log(
                `LocalIndexedDBStoreBackend.connect: upgrading from ${oldVersion}`,
            );
            if (oldVersion < 1) { // The database did not previously exist.
                this._isNewlyCreated = true;
                createDatabase(db);
            }
            if (oldVersion < 2) {
                upgradeSchemaV2(db);
            }
            if (oldVersion < 3) {
                upgradeSchemaV3(db);
            }
            // Expand as needed.
        };

        req.onblocked = () => {
            console.log(
                `can't yet open LocalIndexedDBStoreBackend because it is open elsewhere`,
            );
        };

        console.log(
            `LocalIndexedDBStoreBackend.connect: awaiting connection...`,
        );
        return reqAsEventPromise(req).then((ev) => {
            console.log(
                `LocalIndexedDBStoreBackend.connect: connected`,
            );
            this.db = ev.target.result;

            // add a poorly-named listener for when deleteDatabase is called
            // so we can close our db connections.
            this.db.onversionchange = () => {
                this.db.close();
            };

            return this._init();
        });
    }