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index.js
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index.js
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'use strict';
var net = require('net');
var tls = require('tls');
var util = require('util');
var utils = require('./lib/utils');
var Command = require('./lib/command');
var Queue = require('double-ended-queue');
var errorClasses = require('./lib/customErrors');
var EventEmitter = require('events');
var Parser = require('redis-parser');
var commands = require('redis-commands');
var debug = require('./lib/debug');
var unifyOptions = require('./lib/createClient');
var SUBSCRIBE_COMMANDS = {
subscribe: true,
unsubscribe: true,
psubscribe: true,
punsubscribe: true
};
// Newer Node.js versions > 0.10 return the EventEmitter right away and using .EventEmitter was deprecated
if (typeof EventEmitter !== 'function') {
EventEmitter = EventEmitter.EventEmitter;
}
function noop () {}
function handle_detect_buffers_reply (reply, command, buffer_args) {
if (buffer_args === false || this.message_buffers) {
// If detect_buffers option was specified, then the reply from the parser will be a buffer.
// If this command did not use Buffer arguments, then convert the reply to Strings here.
reply = utils.reply_to_strings(reply);
}
if (command === 'hgetall') {
reply = utils.reply_to_object(reply);
}
return reply;
}
exports.debug_mode = /\bredis\b/i.test(process.env.NODE_DEBUG);
// Attention: The second parameter might be removed at will and is not officially supported.
// Do not rely on this
function RedisClient (options, stream) {
// Copy the options so they are not mutated
options = utils.clone(options);
EventEmitter.call(this);
var cnx_options = {};
var self = this;
/* istanbul ignore next: travis does not work with stunnel atm. Therefore the tls tests are skipped on travis */
for (var tls_option in options.tls) {
cnx_options[tls_option] = options.tls[tls_option];
// Copy the tls options into the general options to make sure the address is set right
if (tls_option === 'port' || tls_option === 'host' || tls_option === 'path' || tls_option === 'family') {
options[tls_option] = options.tls[tls_option];
}
}
if (stream) {
// The stream from the outside is used so no connection from this side is triggered but from the server this client should talk to
// Reconnect etc won't work with this. This requires monkey patching to work, so it is not officially supported
options.stream = stream;
this.address = '"Private stream"';
} else if (options.path) {
cnx_options.path = options.path;
this.address = options.path;
} else {
cnx_options.port = +options.port || 6379;
cnx_options.host = options.host || '127.0.0.1';
cnx_options.family = (!options.family && net.isIP(cnx_options.host)) || (options.family === 'IPv6' ? 6 : 4);
this.address = cnx_options.host + ':' + cnx_options.port;
}
// Warn on misusing deprecated functions
if (typeof options.retry_strategy === 'function') {
if ('max_attempts' in options) {
self.warn('WARNING: You activated the retry_strategy and max_attempts at the same time. This is not possible and max_attempts will be ignored.');
// Do not print deprecation warnings twice
delete options.max_attempts;
}
if ('retry_max_delay' in options) {
self.warn('WARNING: You activated the retry_strategy and retry_max_delay at the same time. This is not possible and retry_max_delay will be ignored.');
// Do not print deprecation warnings twice
delete options.retry_max_delay;
}
}
this.connection_options = cnx_options;
this.connection_id = RedisClient.connection_id++;
this.connected = false;
this.ready = false;
if (options.socket_nodelay === undefined) {
options.socket_nodelay = true;
} else if (!options.socket_nodelay) { // Only warn users with this set to false
self.warn(
'socket_nodelay is deprecated and will be removed in v.3.0.0.\n' +
'Setting socket_nodelay to false likely results in a reduced throughput. Please use .batch for pipelining instead.\n' +
'If you are sure you rely on the NAGLE-algorithm you can activate it by calling client.stream.setNoDelay(false) instead.'
);
}
if (options.socket_keepalive === undefined) {
options.socket_keepalive = true;
}
for (var command in options.rename_commands) {
options.rename_commands[command.toLowerCase()] = options.rename_commands[command];
}
options.return_buffers = !!options.return_buffers;
options.detect_buffers = !!options.detect_buffers;
// Override the detect_buffers setting if return_buffers is active and print a warning
if (options.return_buffers && options.detect_buffers) {
self.warn('WARNING: You activated return_buffers and detect_buffers at the same time. The return value is always going to be a buffer.');
options.detect_buffers = false;
}
if (options.detect_buffers) {
// We only need to look at the arguments if we do not know what we have to return
this.handle_reply = handle_detect_buffers_reply;
}
this.should_buffer = false;
this.max_attempts = options.max_attempts | 0;
if ('max_attempts' in options) {
self.warn(
'max_attempts is deprecated and will be removed in v.3.0.0.\n' +
'To reduce the number of options and to improve the reconnection handling please use the new `retry_strategy` option instead.\n' +
'This replaces the max_attempts and retry_max_delay option.'
);
}
this.command_queue = new Queue(); // Holds sent commands to de-pipeline them
this.offline_queue = new Queue(); // Holds commands issued but not able to be sent
this.pipeline_queue = new Queue(); // Holds all pipelined commands
// ATTENTION: connect_timeout should change in v.3.0 so it does not count towards ending reconnection attempts after x seconds
// This should be done by the retry_strategy. Instead it should only be the timeout for connecting to redis
this.connect_timeout = +options.connect_timeout || 3600000; // 60 * 60 * 1000 ms
this.enable_offline_queue = options.enable_offline_queue === false ? false : true;
this.retry_max_delay = +options.retry_max_delay || null;
if ('retry_max_delay' in options) {
self.warn(
'retry_max_delay is deprecated and will be removed in v.3.0.0.\n' +
'To reduce the amount of options and the improve the reconnection handling please use the new `retry_strategy` option instead.\n' +
'This replaces the max_attempts and retry_max_delay option.'
);
}
this.initialize_retry_vars();
this.pub_sub_mode = 0;
this.subscription_set = {};
this.monitoring = false;
this.message_buffers = false;
this.closing = false;
this.server_info = {};
this.auth_pass = options.auth_pass || options.password;
this.selected_db = options.db; // Save the selected db here, used when reconnecting
this.old_state = null;
this.fire_strings = true; // Determine if strings or buffers should be written to the stream
this.pipeline = false;
this.sub_commands_left = 0;
this.times_connected = 0;
this.buffers = options.return_buffers || options.detect_buffers;
this.options = options;
this.reply = 'ON'; // Returning replies is the default
this.create_stream();
// The listeners will not be attached right away, so let's print the deprecation message while the listener is attached
this.on('newListener', function (event) {
if (event === 'idle') {
this.warn(
'The idle event listener is deprecated and will likely be removed in v.3.0.0.\n' +
'If you rely on this feature please open a new ticket in node_redis with your use case'
);
} else if (event === 'drain') {
this.warn(
'The drain event listener is deprecated and will be removed in v.3.0.0.\n' +
'If you want to keep on listening to this event please listen to the stream drain event directly.'
);
} else if ((event === 'message_buffer' || event === 'pmessage_buffer' || event === 'messageBuffer' || event === 'pmessageBuffer') && !this.buffers && !this.message_buffers) {
if (this.reply_parser.name !== 'javascript') {
return this.warn(
'You attached the "' + event + '" listener without the returnBuffers option set to true.\n' +
'Please use the JavaScript parser or set the returnBuffers option to true to return buffers.'
);
}
this.reply_parser.optionReturnBuffers = true;
this.message_buffers = true;
this.handle_reply = handle_detect_buffers_reply;
}
});
}
util.inherits(RedisClient, EventEmitter);
RedisClient.connection_id = 0;
function create_parser (self) {
return new Parser({
returnReply: function (data) {
self.return_reply(data);
},
returnError: function (err) {
// Return a ReplyError to indicate Redis returned an error
self.return_error(err);
},
returnFatalError: function (err) {
// Error out all fired commands. Otherwise they might rely on faulty data. We have to reconnect to get in a working state again
// Note: the execution order is important. First flush and emit, then create the stream
err.message += '. Please report this.';
self.ready = false;
self.flush_and_error({
message: 'Fatal error encountert. Command aborted.',
code: 'NR_FATAL'
}, {
error: err,
queues: ['command_queue']
});
self.emit('error', err);
self.create_stream();
},
returnBuffers: self.buffers || self.message_buffers,
name: self.options.parser || 'javascript',
stringNumbers: self.options.string_numbers || false
});
}
/******************************************************************************
All functions in here are internal besides the RedisClient constructor
and the exported functions. Don't rely on them as they will be private
functions in node_redis v.3
******************************************************************************/
// Attention: the function name "create_stream" should not be changed, as other libraries need this to mock the stream (e.g. fakeredis)
RedisClient.prototype.create_stream = function () {
var self = this;
// Init parser
this.reply_parser = create_parser(this);
if (this.options.stream) {
// Only add the listeners once in case of a reconnect try (that won't work)
if (this.stream) {
return;
}
this.stream = this.options.stream;
} else {
// On a reconnect destroy the former stream and retry
if (this.stream) {
this.stream.removeAllListeners();
this.stream.destroy();
}
/* istanbul ignore if: travis does not work with stunnel atm. Therefore the tls tests are skipped on travis */
if (this.options.tls) {
this.stream = tls.connect(this.connection_options);
} else {
this.stream = net.createConnection(this.connection_options);
}
}
if (this.options.connect_timeout) {
this.stream.setTimeout(this.connect_timeout, function () {
// Note: This is only tested if a internet connection is established
self.retry_totaltime = self.connect_timeout;
self.connection_gone('timeout');
});
}
/* istanbul ignore next: travis does not work with stunnel atm. Therefore the tls tests are skipped on travis */
var connect_event = this.options.tls ? 'secureConnect' : 'connect';
this.stream.once(connect_event, function () {
this.removeAllListeners('timeout');
self.times_connected++;
self.on_connect();
});
this.stream.on('data', function (buffer_from_socket) {
// The buffer_from_socket.toString() has a significant impact on big chunks and therefore this should only be used if necessary
debug('Net read ' + self.address + ' id ' + self.connection_id); // + ': ' + buffer_from_socket.toString());
self.reply_parser.execute(buffer_from_socket);
self.emit_idle();
});
this.stream.on('error', function (err) {
self.on_error(err);
});
/* istanbul ignore next: difficult to test and not important as long as we keep this listener */
this.stream.on('clientError', function (err) {
debug('clientError occured');
self.on_error(err);
});
this.stream.once('close', function (hadError) {
self.connection_gone('close');
});
this.stream.once('end', function () {
self.connection_gone('end');
});
this.stream.on('drain', function () {
self.drain();
});
if (this.options.socket_nodelay) {
this.stream.setNoDelay();
}
// Fire the command before redis is connected to be sure it's the first fired command
if (this.auth_pass !== undefined) {
this.ready = true;
// Fail silently as we might not be able to connect
this.auth(this.auth_pass, function (err) {
if (err && err.code !== 'UNCERTAIN_STATE') {
self.emit('error', err);
}
});
this.ready = false;
}
};
RedisClient.prototype.handle_reply = function (reply, command) {
if (command === 'hgetall') {
reply = utils.reply_to_object(reply);
}
return reply;
};
RedisClient.prototype.cork = noop;
RedisClient.prototype.uncork = noop;
RedisClient.prototype.initialize_retry_vars = function () {
this.retry_timer = null;
this.retry_totaltime = 0;
this.retry_delay = 200;
this.retry_backoff = 1.7;
this.attempts = 1;
};
RedisClient.prototype.warn = function (msg) {
var self = this;
// Warn on the next tick. Otherwise no event listener can be added
// for warnings that are emitted in the redis client constructor
process.nextTick(function () {
if (self.listeners('warning').length !== 0) {
self.emit('warning', msg);
} else {
console.warn('node_redis:', msg);
}
});
};
// Flush provided queues, erroring any items with a callback first
RedisClient.prototype.flush_and_error = function (error_attributes, options) {
options = options || {};
var aggregated_errors = [];
var queue_names = options.queues || ['command_queue', 'offline_queue']; // Flush the command_queue first to keep the order intakt
for (var i = 0; i < queue_names.length; i++) {
// If the command was fired it might have been processed so far
if (queue_names[i] === 'command_queue') {
error_attributes.message += ' It might have been processed.';
} else { // As the command_queue is flushed first, remove this for the offline queue
error_attributes.message = error_attributes.message.replace(' It might have been processed.', '');
}
// Don't flush everything from the queue
for (var command_obj = this[queue_names[i]].shift(); command_obj; command_obj = this[queue_names[i]].shift()) {
var err = new errorClasses.AbortError(error_attributes);
if (command_obj.error) {
err.stack = err.stack + command_obj.error.stack.replace(/^Error.*?\n/, '\n');
}
err.command = command_obj.command.toUpperCase();
if (command_obj.args && command_obj.args.length) {
err.args = command_obj.args;
}
if (options.error) {
err.origin = options.error;
}
if (typeof command_obj.callback === 'function') {
command_obj.callback(err);
} else {
aggregated_errors.push(err);
}
}
}
// Currently this would be a breaking change, therefore it's only emitted in debug_mode
if (exports.debug_mode && aggregated_errors.length) {
var error;
if (aggregated_errors.length === 1) {
error = aggregated_errors[0];
} else {
error_attributes.message = error_attributes.message.replace('It', 'They').replace(/command/i, '$&s');
error = new errorClasses.AggregateError(error_attributes);
error.errors = aggregated_errors;
}
this.emit('error', error);
}
};
RedisClient.prototype.on_error = function (err) {
if (this.closing) {
return;
}
err.message = 'Redis connection to ' + this.address + ' failed - ' + err.message;
debug(err.message);
this.connected = false;
this.ready = false;
// Only emit the error if the retry_stategy option is not set
if (!this.options.retry_strategy) {
this.emit('error', err);
}
// 'error' events get turned into exceptions if they aren't listened for. If the user handled this error
// then we should try to reconnect.
this.connection_gone('error', err);
};
RedisClient.prototype.on_connect = function () {
debug('Stream connected ' + this.address + ' id ' + this.connection_id);
this.connected = true;
this.ready = false;
this.emitted_end = false;
this.stream.setKeepAlive(this.options.socket_keepalive);
this.stream.setTimeout(0);
this.emit('connect');
this.initialize_retry_vars();
if (this.options.no_ready_check) {
this.on_ready();
} else {
this.ready_check();
}
};
RedisClient.prototype.on_ready = function () {
var self = this;
debug('on_ready called ' + this.address + ' id ' + this.connection_id);
this.ready = true;
this.cork = function () {
self.pipeline = true;
if (self.stream.cork) {
self.stream.cork();
}
};
this.uncork = function () {
if (self.fire_strings) {
self.write_strings();
} else {
self.write_buffers();
}
self.pipeline = false;
self.fire_strings = true;
if (self.stream.uncork) {
// TODO: Consider using next tick here. See https://github.com/NodeRedis/node_redis/issues/1033
self.stream.uncork();
}
};
// Restore modal commands from previous connection. The order of the commands is important
if (this.selected_db !== undefined) {
this.internal_send_command(new Command('select', [this.selected_db]));
}
if (this.monitoring) { // Monitor has to be fired before pub sub commands
this.internal_send_command(new Command('monitor', []));
}
var callback_count = Object.keys(this.subscription_set).length;
if (!this.options.disable_resubscribing && callback_count) {
// only emit 'ready' when all subscriptions were made again
// TODO: Remove the countdown for ready here. This is not coherent with all other modes and should therefore not be handled special
// We know we are ready as soon as all commands were fired
var callback = function () {
callback_count--;
if (callback_count === 0) {
self.emit('ready');
}
};
debug('Sending pub/sub on_ready commands');
for (var key in this.subscription_set) {
var command = key.slice(0, key.indexOf('_'));
var args = this.subscription_set[key];
this[command]([args], callback);
}
this.send_offline_queue();
return;
}
this.send_offline_queue();
this.emit('ready');
};
RedisClient.prototype.on_info_cmd = function (err, res) {
if (err) {
if (err.message === "ERR unknown command 'info'") {
this.on_ready();
return;
}
err.message = 'Ready check failed: ' + err.message;
this.emit('error', err);
return;
}
/* istanbul ignore if: some servers might not respond with any info data. This is just a safety check that is difficult to test */
if (!res) {
debug('The info command returned without any data.');
this.on_ready();
return;
}
if (!this.server_info.loading || this.server_info.loading === '0') {
// If the master_link_status exists but the link is not up, try again after 50 ms
if (this.server_info.master_link_status && this.server_info.master_link_status !== 'up') {
this.server_info.loading_eta_seconds = 0.05;
} else {
// Eta loading should change
debug('Redis server ready.');
this.on_ready();
return;
}
}
var retry_time = +this.server_info.loading_eta_seconds * 1000;
if (retry_time > 1000) {
retry_time = 1000;
}
debug('Redis server still loading, trying again in ' + retry_time);
setTimeout(function (self) {
self.ready_check();
}, retry_time, this);
};
RedisClient.prototype.ready_check = function () {
var self = this;
debug('Checking server ready state...');
// Always fire this info command as first command even if other commands are already queued up
this.ready = true;
this.info(function (err, res) {
self.on_info_cmd(err, res);
});
this.ready = false;
};
RedisClient.prototype.send_offline_queue = function () {
for (var command_obj = this.offline_queue.shift(); command_obj; command_obj = this.offline_queue.shift()) {
debug('Sending offline command: ' + command_obj.command);
this.internal_send_command(command_obj);
}
this.drain();
};
var retry_connection = function (self, error) {
debug('Retrying connection...');
var reconnect_params = {
delay: self.retry_delay,
attempt: self.attempts,
error: error
};
if (self.options.camel_case) {
reconnect_params.totalRetryTime = self.retry_totaltime;
reconnect_params.timesConnected = self.times_connected;
} else {
reconnect_params.total_retry_time = self.retry_totaltime;
reconnect_params.times_connected = self.times_connected;
}
self.emit('reconnecting', reconnect_params);
self.retry_totaltime += self.retry_delay;
self.attempts += 1;
self.retry_delay = Math.round(self.retry_delay * self.retry_backoff);
self.create_stream();
self.retry_timer = null;
};
RedisClient.prototype.connection_gone = function (why, error) {
// If a retry is already in progress, just let that happen
if (this.retry_timer) {
return;
}
error = error || null;
debug('Redis connection is gone from ' + why + ' event.');
this.connected = false;
this.ready = false;
// Deactivate cork to work with the offline queue
this.cork = noop;
this.uncork = noop;
this.pipeline = false;
this.pub_sub_mode = 0;
// since we are collapsing end and close, users don't expect to be called twice
if (!this.emitted_end) {
this.emit('end');
this.emitted_end = true;
}
// If this is a requested shutdown, then don't retry
if (this.closing) {
debug('Connection ended by quit / end command, not retrying.');
this.flush_and_error({
message: 'Stream connection ended and command aborted.',
code: 'NR_CLOSED'
}, {
error: error
});
return;
}
if (typeof this.options.retry_strategy === 'function') {
var retry_params = {
attempt: this.attempts,
error: error
};
if (this.options.camel_case) {
retry_params.totalRetryTime = this.retry_totaltime;
retry_params.timesConnected = this.times_connected;
} else {
retry_params.total_retry_time = this.retry_totaltime;
retry_params.times_connected = this.times_connected;
}
this.retry_delay = this.options.retry_strategy(retry_params);
if (typeof this.retry_delay !== 'number') {
// Pass individual error through
if (this.retry_delay instanceof Error) {
error = this.retry_delay;
}
this.flush_and_error({
message: 'Stream connection ended and command aborted.',
code: 'NR_CLOSED'
}, {
error: error
});
this.end(false);
return;
}
}
if (this.max_attempts !== 0 && this.attempts >= this.max_attempts || this.retry_totaltime >= this.connect_timeout) {
var message = 'Redis connection in broken state: ';
if (this.retry_totaltime >= this.connect_timeout) {
message += 'connection timeout exceeded.';
} else {
message += 'maximum connection attempts exceeded.';
}
this.flush_and_error({
message: message,
code: 'CONNECTION_BROKEN',
}, {
error: error
});
var err = new Error(message);
err.code = 'CONNECTION_BROKEN';
if (error) {
err.origin = error;
}
this.emit('error', err);
this.end(false);
return;
}
// Retry commands after a reconnect instead of throwing an error. Use this with caution
if (this.options.retry_unfulfilled_commands) {
this.offline_queue.unshift.apply(this.offline_queue, this.command_queue.toArray());
this.command_queue.clear();
} else if (this.command_queue.length !== 0) {
this.flush_and_error({
message: 'Redis connection lost and command aborted.',
code: 'UNCERTAIN_STATE'
}, {
error: error,
queues: ['command_queue']
});
}
if (this.retry_max_delay !== null && this.retry_delay > this.retry_max_delay) {
this.retry_delay = this.retry_max_delay;
} else if (this.retry_totaltime + this.retry_delay > this.connect_timeout) {
// Do not exceed the maximum
this.retry_delay = this.connect_timeout - this.retry_totaltime;
}
debug('Retry connection in ' + this.retry_delay + ' ms');
this.retry_timer = setTimeout(retry_connection, this.retry_delay, this, error);
};
RedisClient.prototype.return_error = function (err) {
var command_obj = this.command_queue.shift();
if (command_obj.error) {
err.stack = command_obj.error.stack.replace(/^Error.*?\n/, 'ReplyError: ' + err.message + '\n');
}
err.command = command_obj.command.toUpperCase();
if (command_obj.args && command_obj.args.length) {
err.args = command_obj.args;
}
// Count down pub sub mode if in entering modus
if (this.pub_sub_mode > 1) {
this.pub_sub_mode--;
}
var match = err.message.match(utils.err_code);
// LUA script could return user errors that don't behave like all other errors!
if (match) {
err.code = match[1];
}
utils.callback_or_emit(this, command_obj.callback, err);
};
RedisClient.prototype.drain = function () {
this.emit('drain');
this.should_buffer = false;
};
RedisClient.prototype.emit_idle = function () {
if (this.command_queue.length === 0 && this.pub_sub_mode === 0) {
this.emit('idle');
}
};
function normal_reply (self, reply) {
var command_obj = self.command_queue.shift();
if (typeof command_obj.callback === 'function') {
if (command_obj.command !== 'exec') {
reply = self.handle_reply(reply, command_obj.command, command_obj.buffer_args);
}
command_obj.callback(null, reply);
} else {
debug('No callback for reply');
}
}
function subscribe_unsubscribe (self, reply, type) {
// Subscribe commands take an optional callback and also emit an event, but only the _last_ response is included in the callback
// The pub sub commands return each argument in a separate return value and have to be handled that way
var command_obj = self.command_queue.get(0);
var buffer = self.options.return_buffers || self.options.detect_buffers && command_obj.buffer_args;
var channel = (buffer || reply[1] === null) ? reply[1] : reply[1].toString();
var count = +reply[2]; // Return the channel counter as number no matter if `string_numbers` is activated or not
debug(type, channel);
// Emit first, then return the callback
if (channel !== null) { // Do not emit or "unsubscribe" something if there was no channel to unsubscribe from
self.emit(type, channel, count);
if (type === 'subscribe' || type === 'psubscribe') {
self.subscription_set[type + '_' + channel] = channel;
} else {
type = type === 'unsubscribe' ? 'subscribe' : 'psubscribe'; // Make types consistent
delete self.subscription_set[type + '_' + channel];
}
}
if (command_obj.args.length === 1 || self.sub_commands_left === 1 || command_obj.args.length === 0 && (count === 0 || channel === null)) {
if (count === 0) { // unsubscribed from all channels
var running_command;
var i = 1;
self.pub_sub_mode = 0; // Deactivating pub sub mode
// This should be a rare case and therefore handling it this way should be good performance wise for the general case
while (running_command = self.command_queue.get(i)) {
if (SUBSCRIBE_COMMANDS[running_command.command]) {
self.pub_sub_mode = i; // Entering pub sub mode again
break;
}
i++;
}
}
self.command_queue.shift();
if (typeof command_obj.callback === 'function') {
// TODO: The current return value is pretty useless.
// Evaluate to change this in v.3 to return all subscribed / unsubscribed channels in an array including the number of channels subscribed too
command_obj.callback(null, channel);
}
self.sub_commands_left = 0;
} else {
if (self.sub_commands_left !== 0) {
self.sub_commands_left--;
} else {
self.sub_commands_left = command_obj.args.length ? command_obj.args.length - 1 : count;
}
}
}
function return_pub_sub (self, reply) {
var type = reply[0].toString();
if (type === 'message') { // channel, message
if (!self.options.return_buffers || self.message_buffers) { // backwards compatible. Refactor this in v.3 to always return a string on the normal emitter
self.emit('message', reply[1].toString(), reply[2].toString());
self.emit('message_buffer', reply[1], reply[2]);
self.emit('messageBuffer', reply[1], reply[2]);
} else {
self.emit('message', reply[1], reply[2]);
}
} else if (type === 'pmessage') { // pattern, channel, message
if (!self.options.return_buffers || self.message_buffers) { // backwards compatible. Refactor this in v.3 to always return a string on the normal emitter
self.emit('pmessage', reply[1].toString(), reply[2].toString(), reply[3].toString());
self.emit('pmessage_buffer', reply[1], reply[2], reply[3]);
self.emit('pmessageBuffer', reply[1], reply[2], reply[3]);
} else {
self.emit('pmessage', reply[1], reply[2], reply[3]);
}
} else {
subscribe_unsubscribe(self, reply, type);
}
}
RedisClient.prototype.return_reply = function (reply) {
if (this.monitoring) {
var replyStr;
if (this.buffers && Buffer.isBuffer(reply)) {
replyStr = reply.toString();
} else {
replyStr = reply;
}
// If in monitor mode, all normal commands are still working and we only want to emit the streamlined commands
if (typeof replyStr === 'string' && utils.monitor_regex.test(replyStr)) {
var timestamp = replyStr.slice(0, replyStr.indexOf(' '));
var args = replyStr.slice(replyStr.indexOf('"') + 1, -1).split('" "').map(function (elem) {
return elem.replace(/\\"/g, '"');
});
this.emit('monitor', timestamp, args, replyStr);
return;
}
}
if (this.pub_sub_mode === 0) {
normal_reply(this, reply);
} else if (this.pub_sub_mode !== 1) {
this.pub_sub_mode--;
normal_reply(this, reply);
} else if (!(reply instanceof Array) || reply.length <= 2) {
// Only PING and QUIT are allowed in this context besides the pub sub commands
// Ping replies with ['pong', null|value] and quit with 'OK'
normal_reply(this, reply);
} else {
return_pub_sub(this, reply);
}
};
function handle_offline_command (self, command_obj) {
var command = command_obj.command;
var err, msg;
if (self.closing || !self.enable_offline_queue) {
command = command.toUpperCase();
if (!self.closing) {
if (self.stream.writable) {
msg = 'The connection is not yet established and the offline queue is deactivated.';
} else {
msg = 'Stream not writeable.';
}
} else {
msg = 'The connection is already closed.';
}
err = new errorClasses.AbortError({
message: command + " can't be processed. " + msg,
code: 'NR_CLOSED',
command: command
});
if (command_obj.args.length) {
err.args = command_obj.args;
}
utils.reply_in_order(self, command_obj.callback, err);
} else {
debug('Queueing ' + command + ' for next server connection.');
self.offline_queue.push(command_obj);
}
self.should_buffer = true;
}
// Do not call internal_send_command directly, if you are not absolutly certain it handles everything properly
// e.g. monitor / info does not work with internal_send_command only
RedisClient.prototype.internal_send_command = function (command_obj) {
var arg, prefix_keys;
var i = 0;
var command_str = '';
var args = command_obj.args;
var command = command_obj.command;
var len = args.length;
var big_data = false;
var args_copy = new Array(len);
if (process.domain && command_obj.callback) {
command_obj.callback = process.domain.bind(command_obj.callback);
}
if (this.ready === false || this.stream.writable === false) {
// Handle offline commands right away
handle_offline_command(this, command_obj);
return false; // Indicate buffering
}
for (i = 0; i < len; i += 1) {
if (typeof args[i] === 'string') {
// 30000 seemed to be a good value to switch to buffers after testing and checking the pros and cons
if (args[i].length > 30000) {
big_data = true;
args_copy[i] = new Buffer(args[i], 'utf8');
} else {
args_copy[i] = args[i];
}
} else if (typeof args[i] === 'object') { // Checking for object instead of Buffer.isBuffer helps us finding data types that we can't handle properly
if (args[i] instanceof Date) { // Accept dates as valid input
args_copy[i] = args[i].toString();
} else if (args[i] === null) {
this.warn(
'Deprecated: The ' + command.toUpperCase() + ' command contains a "null" argument.\n' +
'This is converted to a "null" string now and will return an error from v.3.0 on.\n' +
'Please handle this in your code to make sure everything works as you intended it to.'
);
args_copy[i] = 'null'; // Backwards compatible :/
} else if (Buffer.isBuffer(args[i])) {
args_copy[i] = args[i];
command_obj.buffer_args = true;
big_data = true;
} else {
this.warn(
'Deprecated: The ' + command.toUpperCase() + ' command contains a argument of type ' + args[i].constructor.name + '.\n' +
'This is converted to "' + args[i].toString() + '" by using .toString() now and will return an error from v.3.0 on.\n' +
'Please handle this in your code to make sure everything works as you intended it to.'
);
args_copy[i] = args[i].toString(); // Backwards compatible :/
}
} else if (typeof args[i] === 'undefined') {
this.warn(
'Deprecated: The ' + command.toUpperCase() + ' command contains a "undefined" argument.\n' +
'This is converted to a "undefined" string now and will return an error from v.3.0 on.\n' +
'Please handle this in your code to make sure everything works as you intended it to.'
);
args_copy[i] = 'undefined'; // Backwards compatible :/
} else {
// Seems like numbers are converted fast using string concatenation
args_copy[i] = '' + args[i];
}
}
if (this.options.prefix) {
prefix_keys = commands.getKeyIndexes(command, args_copy);
for (i = prefix_keys.pop(); i !== undefined; i = prefix_keys.pop()) {
args_copy[i] = this.options.prefix + args_copy[i];
}
}
if (this.options.rename_commands && this.options.rename_commands[command]) {
command = this.options.rename_commands[command];
}
// Always use 'Multi bulk commands', but if passed any Buffer args, then do multiple writes, one for each arg.
// This means that using Buffers in commands is going to be slower, so use Strings if you don't already have a Buffer.
command_str = '*' + (len + 1) + '\r\n$' + command.length + '\r\n' + command + '\r\n';
if (big_data === false) { // Build up a string and send entire command in one write
for (i = 0; i < len; i += 1) {
arg = args_copy[i];
command_str += '$' + Buffer.byteLength(arg) + '\r\n' + arg + '\r\n';
}
debug('Send ' + this.address + ' id ' + this.connection_id + ': ' + command_str);
this.write(command_str);
} else {
debug('Send command (' + command_str + ') has Buffer arguments');
this.fire_strings = false;
this.write(command_str);
for (i = 0; i < len; i += 1) {
arg = args_copy[i];
if (typeof arg === 'string') {
this.write('$' + Buffer.byteLength(arg) + '\r\n' + arg + '\r\n');
} else { // buffer
this.write('$' + arg.length + '\r\n');
this.write(arg);
this.write('\r\n');
}
debug('send_command: buffer send ' + arg.length + ' bytes');
}
}
if (command_obj.call_on_write) {
command_obj.call_on_write();
}
// Handle `CLIENT REPLY ON|OFF|SKIP`
// This has to be checked after call_on_write
/* istanbul ignore else: TODO: Remove this as soon as we test Redis 3.2 on travis */
if (this.reply === 'ON') {
this.command_queue.push(command_obj);
} else {
// Do not expect a reply
// Does this work in combination with the pub sub mode?
if (command_obj.callback) {
utils.reply_in_order(this, command_obj.callback, null, undefined, this.command_queue);
}
if (this.reply === 'SKIP') {
this.reply = 'SKIP_ONE_MORE';
} else if (this.reply === 'SKIP_ONE_MORE') {
this.reply = 'ON';
}
}
return !this.should_buffer;
};
RedisClient.prototype.write_strings = function () {
var str = '';
for (var command = this.pipeline_queue.shift(); command; command = this.pipeline_queue.shift()) {
// Write to stream if the string is bigger than 4mb. The biggest string may be Math.pow(2, 28) - 15 chars long
if (str.length + command.length > 4 * 1024 * 1024) {
this.should_buffer = !this.stream.write(str);
str = '';
}