initial commit from working version

1 files changed, 1284 insertions, 0 deletions

diff --git a/signaling-server/node_modules/redis/index.js b/signaling-server/node_modules/redis/index.js
new file mode 100644
index 0000000..7ec7477
--- /dev/null
+++ b/signaling-server/node_modules/redis/index.js
@@ -0,0 +1,1284 @@
+/*global Buffer require exports console setTimeout */
+
+var net = require("net"),
+    util = require("./lib/util"),
+    Queue = require("./lib/queue"),
+    to_array = require("./lib/to_array"),
+    events = require("events"),
+    crypto = require("crypto"),
+    parsers = [], commands,
+    connection_id = 0,
+    default_port = 6379,
+    default_host = "127.0.0.1";
+
+// can set this to true to enable for all connections
+exports.debug_mode = false;
+
+var arraySlice = Array.prototype.slice
+function trace() {
+    if (!exports.debug_mode) return;
+    console.log.apply(null, arraySlice.call(arguments))
+}
+
+// hiredis might not be installed
+try {
+    require("./lib/parser/hiredis");
+    parsers.push(require("./lib/parser/hiredis"));
+} catch (err) {
+    if (exports.debug_mode) {
+        console.warn("hiredis parser not installed.");
+    }
+}
+
+parsers.push(require("./lib/parser/javascript"));
+
+function RedisClient(stream, options) {
+    this.stream = stream;
+    this.options = options = options || {};
+
+    this.connection_id = ++connection_id;
+    this.connected = false;
+    this.ready = false;
+    this.connections = 0;
+    if (this.options.socket_nodelay === undefined) {
+        this.options.socket_nodelay = true;
+    }
+    if (this.options.socket_keepalive === undefined) {
+        this.options.socket_keepalive = true;
+    }
+    this.should_buffer = false;
+    this.command_queue_high_water = this.options.command_queue_high_water || 1000;
+    this.command_queue_low_water = this.options.command_queue_low_water || 0;
+    this.max_attempts = null;
+    if (options.max_attempts && !isNaN(options.max_attempts) && options.max_attempts > 0) {
+        this.max_attempts = +options.max_attempts;
+    }
+    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.commands_sent = 0;
+    this.connect_timeout = false;
+    if (options.connect_timeout && !isNaN(options.connect_timeout) && options.connect_timeout > 0) {
+        this.connect_timeout = +options.connect_timeout;
+    }
+    this.enable_offline_queue = true;
+    if (typeof this.options.enable_offline_queue === "boolean") {
+        this.enable_offline_queue = this.options.enable_offline_queue;
+    }
+    this.retry_max_delay = null;
+    if (options.retry_max_delay !== undefined && !isNaN(options.retry_max_delay) && options.retry_max_delay > 0) {
+        this.retry_max_delay = options.retry_max_delay;
+    }
+
+    this.initialize_retry_vars();
+    this.pub_sub_mode = false;
+    this.subscription_set = {};
+    this.monitoring = false;
+    this.closing = false;
+    this.server_info = {};
+    this.auth_pass = null;
+    if (options.auth_pass !== undefined) {
+        this.auth_pass = options.auth_pass;
+    }
+    this.parser_module = null;
+    this.selected_db = null;	// save the selected db here, used when reconnecting
+
+    this.old_state = null;
+
+    this.install_stream_listeners();
+
+    events.EventEmitter.call(this);
+}
+util.inherits(RedisClient, events.EventEmitter);
+exports.RedisClient = RedisClient;
+
+RedisClient.prototype.install_stream_listeners = function() {
+    var self = this;
+
+    this.stream.on("connect", function () {
+        self.on_connect();
+    });
+
+    this.stream.on("data", function (buffer_from_socket) {
+        self.on_data(buffer_from_socket);
+    });
+
+    this.stream.on("error", function (msg) {
+        self.on_error(msg.message);
+    });
+
+    this.stream.on("close", function () {
+        self.connection_gone("close");
+    });
+
+    this.stream.on("end", function () {
+        self.connection_gone("end");
+    });
+
+    this.stream.on("drain", function () {
+        self.should_buffer = false;
+        self.emit("drain");
+    });
+};
+
+RedisClient.prototype.initialize_retry_vars = function () {
+    this.retry_timer = null;
+    this.retry_totaltime = 0;
+    this.retry_delay = 150;
+    this.retry_backoff = 1.7;
+    this.attempts = 1;
+};
+
+RedisClient.prototype.unref = function () {
+    trace("User requesting to unref the connection");
+    if (this.connected) {
+        trace("unref'ing the socket connection");
+        this.stream.unref();
+    }
+    else {
+        trace("Not connected yet, will unref later");
+        this.once("connect", function () {
+            this.unref();
+        })
+    }
+};
+
+// flush offline_queue and command_queue, erroring any items with a callback first
+RedisClient.prototype.flush_and_error = function (message) {
+    var command_obj, error;
+
+    error = new Error(message);
+
+    while (this.offline_queue.length > 0) {
+        command_obj = this.offline_queue.shift();
+        if (typeof command_obj.callback === "function") {
+            try {
+                command_obj.callback(error);
+            } catch (callback_err) {
+                process.nextTick(function () {
+                    throw callback_err;
+                });
+            }
+        }
+    }
+    this.offline_queue = new Queue();
+
+    while (this.command_queue.length > 0) {
+        command_obj = this.command_queue.shift();
+        if (typeof command_obj.callback === "function") {
+            try {
+                command_obj.callback(error);
+            } catch (callback_err) {
+                process.nextTick(function () {
+                    throw callback_err;
+                });
+            }
+        }
+    }
+    this.command_queue = new Queue();
+};
+
+RedisClient.prototype.on_error = function (msg) {
+    var message = "Redis connection to " + this.address + " failed - " + msg;
+
+    if (this.closing) {
+        return;
+    }
+
+    if (exports.debug_mode) {
+        console.warn(message);
+    }
+
+    this.flush_and_error(message);
+
+    this.connected = false;
+    this.ready = false;
+
+    this.emit("error", new Error(message));
+    // "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");
+};
+
+RedisClient.prototype.do_auth = function () {
+    var self = this;
+
+    if (exports.debug_mode) {
+        console.log("Sending auth to " + self.address + " id " + self.connection_id);
+    }
+    self.send_anyway = true;
+    self.send_command("auth", [this.auth_pass], function (err, res) {
+        if (err) {
+            if (err.toString().match("LOADING")) {
+                // if redis is still loading the db, it will not authenticate and everything else will fail
+                console.log("Redis still loading, trying to authenticate later");
+                setTimeout(function () {
+                    self.do_auth();
+                }, 2000); // TODO - magic number alert
+                return;
+            } else if (err.toString().match("no password is set")) {
+                console.log("Warning: Redis server does not require a password, but a password was supplied.")
+                err = null;
+                res = "OK";
+            } else {
+                return self.emit("error", new Error("Auth error: " + err.message));
+            }
+        }
+        if (res.toString() !== "OK") {
+            return self.emit("error", new Error("Auth failed: " + res.toString()));
+        }
+        if (exports.debug_mode) {
+            console.log("Auth succeeded " + self.address + " id " + self.connection_id);
+        }
+        if (self.auth_callback) {
+            self.auth_callback(err, res);
+            self.auth_callback = null;
+        }
+
+        // now we are really connected
+        self.emit("connect");
+        self.initialize_retry_vars();
+
+        if (self.options.no_ready_check) {
+            self.on_ready();
+        } else {
+            self.ready_check();
+        }
+    });
+    self.send_anyway = false;
+};
+
+RedisClient.prototype.on_connect = function () {
+    if (exports.debug_mode) {
+        console.log("Stream connected " + this.address + " id " + this.connection_id);
+    }
+
+    this.connected = true;
+    this.ready = false;
+    this.connections += 1;
+    this.command_queue = new Queue();
+    this.emitted_end = false;
+    if (this.options.socket_nodelay) {
+        this.stream.setNoDelay();
+    }
+    this.stream.setKeepAlive(this.options.socket_keepalive);
+    this.stream.setTimeout(0);
+
+    this.init_parser();
+
+    if (this.auth_pass) {
+        this.do_auth();
+    } else {
+        this.emit("connect");
+        this.initialize_retry_vars();
+
+        if (this.options.no_ready_check) {
+            this.on_ready();
+        } else {
+            this.ready_check();
+        }
+    }
+};
+
+RedisClient.prototype.init_parser = function () {
+    var self = this;
+
+    if (this.options.parser) {
+        if (! parsers.some(function (parser) {
+            if (parser.name === self.options.parser) {
+                self.parser_module = parser;
+                if (exports.debug_mode) {
+                    console.log("Using parser module: " + self.parser_module.name);
+                }
+                return true;
+            }
+        })) {
+            throw new Error("Couldn't find named parser " + self.options.parser + " on this system");
+        }
+    } else {
+        if (exports.debug_mode) {
+            console.log("Using default parser module: " + parsers[0].name);
+        }
+        this.parser_module = parsers[0];
+    }
+
+    this.parser_module.debug_mode = exports.debug_mode;
+
+    // return_buffers sends back Buffers from parser to callback. detect_buffers sends back Buffers from parser, but
+    // converts to Strings if the input arguments are not Buffers.
+    this.reply_parser = new this.parser_module.Parser({
+        return_buffers: self.options.return_buffers || self.options.detect_buffers || false
+    });
+
+    // "reply error" is an error sent back by Redis
+    this.reply_parser.on("reply error", function (reply) {
+        if (reply instanceof Error) {
+            self.return_error(reply);
+        } else {
+            self.return_error(new Error(reply));
+        }
+    });
+    this.reply_parser.on("reply", function (reply) {
+        self.return_reply(reply);
+    });
+    // "error" is bad.  Somehow the parser got confused.  It'll try to reset and continue.
+    this.reply_parser.on("error", function (err) {
+        self.emit("error", new Error("Redis reply parser error: " + err.stack));
+    });
+};
+
+RedisClient.prototype.on_ready = function () {
+    var self = this;
+
+    this.ready = true;
+
+    if (this.old_state !== null) {
+        this.monitoring = this.old_state.monitoring;
+        this.pub_sub_mode = this.old_state.pub_sub_mode;
+        this.selected_db = this.old_state.selected_db;
+        this.old_state = null;
+    }
+
+    // magically restore any modal commands from a previous connection
+    if (this.selected_db !== null) {
+        // this trick works if and only if the following send_command
+        // never goes into the offline queue
+        var pub_sub_mode = this.pub_sub_mode;
+        this.pub_sub_mode = false;
+        this.send_command('select', [this.selected_db]);
+        this.pub_sub_mode = pub_sub_mode;
+    }
+    if (this.pub_sub_mode === true) {
+        // only emit "ready" when all subscriptions were made again
+        var callback_count = 0;
+        var callback = function () {
+            callback_count--;
+            if (callback_count === 0) {
+                self.emit("ready");
+            }
+        };
+        Object.keys(this.subscription_set).forEach(function (key) {
+            var parts = key.split(" ");
+            if (exports.debug_mode) {
+                console.warn("sending pub/sub on_ready " + parts[0] + ", " + parts[1]);
+            }
+            callback_count++;
+            self.send_command(parts[0] + "scribe", [parts[1]], callback);
+        });
+        return;
+    } else if (this.monitoring) {
+        this.send_command("monitor");
+    } else {
+        this.send_offline_queue();
+    }
+    this.emit("ready");
+};
+
+RedisClient.prototype.on_info_cmd = function (err, res) {
+    var self = this, obj = {}, lines, retry_time;
+
+    if (err) {
+        return self.emit("error", new Error("Ready check failed: " + err.message));
+    }
+
+    lines = res.toString().split("\r\n");
+
+    lines.forEach(function (line) {
+        var parts = line.split(':');
+        if (parts[1]) {
+            obj[parts[0]] = parts[1];
+        }
+    });
+
+    obj.versions = [];
+    if( obj.redis_version ){
+        obj.redis_version.split('.').forEach(function (num) {
+            obj.versions.push(+num);
+        });
+    }
+
+    // expose info key/vals to users
+    this.server_info = obj;
+
+    if (!obj.loading || (obj.loading && obj.loading === "0")) {
+        if (exports.debug_mode) {
+            console.log("Redis server ready.");
+        }
+        this.on_ready();
+    } else {
+        retry_time = obj.loading_eta_seconds * 1000;
+        if (retry_time > 1000) {
+            retry_time = 1000;
+        }
+        if (exports.debug_mode) {
+            console.log("Redis server still loading, trying again in " + retry_time);
+        }
+        setTimeout(function () {
+            self.ready_check();
+        }, retry_time);
+    }
+};
+
+RedisClient.prototype.ready_check = function () {
+    var self = this;
+
+    if (exports.debug_mode) {
+        console.log("checking server ready state...");
+    }
+
+    this.send_anyway = true;  // secret flag to send_command to send something even if not "ready"
+    this.info(function (err, res) {
+        self.on_info_cmd(err, res);
+    });
+    this.send_anyway = false;
+};
+
+RedisClient.prototype.send_offline_queue = function () {
+    var command_obj, buffered_writes = 0;
+
+    while (this.offline_queue.length > 0) {
+        command_obj = this.offline_queue.shift();
+        if (exports.debug_mode) {
+            console.log("Sending offline command: " + command_obj.command);
+        }
+        buffered_writes += !this.send_command(command_obj.command, command_obj.args, command_obj.callback);
+    }
+    this.offline_queue = new Queue();
+    // Even though items were shifted off, Queue backing store still uses memory until next add, so just get a new Queue
+
+    if (!buffered_writes) {
+        this.should_buffer = false;
+        this.emit("drain");
+    }
+};
+
+RedisClient.prototype.connection_gone = function (why) {
+    var self = this;
+
+    // If a retry is already in progress, just let that happen
+    if (this.retry_timer) {
+        return;
+    }
+
+    if (exports.debug_mode) {
+        console.warn("Redis connection is gone from " + why + " event.");
+    }
+    this.connected = false;
+    this.ready = false;
+
+    if (this.old_state === null) {
+        var state = {
+            monitoring: this.monitoring,
+            pub_sub_mode: this.pub_sub_mode,
+            selected_db: this.selected_db
+        };
+        this.old_state = state;
+        this.monitoring = false;
+        this.pub_sub_mode = false;
+        this.selected_db = null;
+    }
+
+    // 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;
+    }
+
+    this.flush_and_error("Redis connection gone from " + why + " event.");
+
+    // If this is a requested shutdown, then don't retry
+    if (this.closing) {
+        this.retry_timer = null;
+        if (exports.debug_mode) {
+            console.warn("connection ended from quit command, not retrying.");
+        }
+        return;
+    }
+
+    var nextDelay = Math.floor(this.retry_delay * this.retry_backoff);
+    if (this.retry_max_delay !== null && nextDelay > this.retry_max_delay) {
+        this.retry_delay = this.retry_max_delay;
+    } else {
+        this.retry_delay = nextDelay;
+    }
+
+    if (exports.debug_mode) {
+        console.log("Retry connection in " + this.retry_delay + " ms");
+    }
+
+    if (this.max_attempts && this.attempts >= this.max_attempts) {
+        this.retry_timer = null;
+        // TODO - some people need a "Redis is Broken mode" for future commands that errors immediately, and others
+        // want the program to exit.  Right now, we just log, which doesn't really help in either case.
+        console.error("node_redis: Couldn't get Redis connection after " + this.max_attempts + " attempts.");
+        return;
+    }
+
+    this.attempts += 1;
+    this.emit("reconnecting", {
+        delay: self.retry_delay,
+        attempt: self.attempts
+    });
+    this.retry_timer = setTimeout(function () {
+        if (exports.debug_mode) {
+            console.log("Retrying connection...");
+        }
+
+        self.retry_totaltime += self.retry_delay;
+
+        if (self.connect_timeout && self.retry_totaltime >= self.connect_timeout) {
+            self.retry_timer = null;
+            // TODO - engage Redis is Broken mode for future commands, or whatever
+            console.error("node_redis: Couldn't get Redis connection after " + self.retry_totaltime + "ms.");
+            return;
+        }
+
+        self.stream = net.createConnection(self.connectionOption);
+        self.install_stream_listeners();
+        self.retry_timer = null;
+    }, this.retry_delay);
+};
+
+RedisClient.prototype.on_data = function (data) {
+    if (exports.debug_mode) {
+        console.log("net read " + this.address + " id " + this.connection_id + ": " + data.toString());
+    }
+
+    try {
+        this.reply_parser.execute(data);
+    } catch (err) {
+        // This is an unexpected parser problem, an exception that came from the parser code itself.
+        // Parser should emit "error" events if it notices things are out of whack.
+        // Callbacks that throw exceptions will land in return_reply(), below.
+        // TODO - it might be nice to have a different "error" event for different types of errors
+        this.emit("error", err);
+    }
+};
+
+RedisClient.prototype.return_error = function (err) {
+    var command_obj = this.command_queue.shift(), queue_len = this.command_queue.getLength();
+
+    if (this.pub_sub_mode === false && queue_len === 0) {
+        this.command_queue = new Queue();
+        this.emit("idle");
+    }
+    if (this.should_buffer && queue_len <= this.command_queue_low_water) {
+        this.emit("drain");
+        this.should_buffer = false;
+    }
+
+    if (command_obj && typeof command_obj.callback === "function") {
+        try {
+            command_obj.callback(err);
+        } catch (callback_err) {
+            // if a callback throws an exception, re-throw it on a new stack so the parser can keep going
+            process.nextTick(function () {
+                throw callback_err;
+            });
+        }
+    } else {
+        console.log("node_redis: no callback to send error: " + err.message);
+        // this will probably not make it anywhere useful, but we might as well throw
+        process.nextTick(function () {
+            throw err;
+        });
+    }
+};
+
+// if a callback throws an exception, re-throw it on a new stack so the parser can keep going.
+// if a domain is active, emit the error on the domain, which will serve the same function.
+// put this try/catch in its own function because V8 doesn't optimize this well yet.
+function try_callback(callback, reply) {
+    try {
+        callback(null, reply);
+    } catch (err) {
+        if (process.domain) {
+            var currDomain = process.domain;
+            currDomain.emit('error', err);
+            if (process.domain === currDomain) {
+                currDomain.exit();
+            }
+        } else {
+            process.nextTick(function () {
+                throw err;
+            });
+        }
+    }
+}
+
+// hgetall converts its replies to an Object.  If the reply is empty, null is returned.
+function reply_to_object(reply) {
+    var obj = {}, j, jl, key, val;
+
+    if (reply.length === 0) {
+        return null;
+    }
+
+    for (j = 0, jl = reply.length; j < jl; j += 2) {
+        key = reply[j].toString('binary');
+        val = reply[j + 1];
+        obj[key] = val;
+    }
+
+    return obj;
+}
+
+function reply_to_strings(reply) {
+    var i;
+
+    if (Buffer.isBuffer(reply)) {
+        return reply.toString();
+    }
+
+    if (Array.isArray(reply)) {
+        for (i = 0; i < reply.length; i++) {
+            if (reply[i] !== null && reply[i] !== undefined) {
+                reply[i] = reply[i].toString();
+            }
+        }
+        return reply;
+    }
+
+    return reply;
+}
+
+RedisClient.prototype.return_reply = function (reply) {
+    var command_obj, len, type, timestamp, argindex, args, queue_len;
+
+    // If the "reply" here is actually a message received asynchronously due to a
+    // pubsub subscription, don't pop the command queue as we'll only be consuming
+    // the head command prematurely.
+    if (Array.isArray(reply) && reply.length > 0 && reply[0]) {
+        type = reply[0].toString();
+    }
+
+    if (this.pub_sub_mode && (type == 'message' || type == 'pmessage')) {
+        trace("received pubsub message");
+    }
+    else {
+        command_obj = this.command_queue.shift();
+    }
+
+    queue_len = this.command_queue.getLength();
+
+    if (this.pub_sub_mode === false && queue_len === 0) {
+        this.command_queue = new Queue();  // explicitly reclaim storage from old Queue
+        this.emit("idle");
+    }
+    if (this.should_buffer && queue_len <= this.command_queue_low_water) {
+        this.emit("drain");
+        this.should_buffer = false;
+    }
+
+    if (command_obj && !command_obj.sub_command) {
+        if (typeof command_obj.callback === "function") {
+            if (this.options.detect_buffers && command_obj.buffer_args === false) {
+                // If detect_buffers option was specified, then the reply from the parser will be Buffers.
+                // If this command did not use Buffer arguments, then convert the reply to Strings here.
+                reply = reply_to_strings(reply);
+            }
+
+            // TODO - confusing and error-prone that hgetall is special cased in two places
+            if (reply && 'hgetall' === command_obj.command.toLowerCase()) {
+                reply = reply_to_object(reply);
+            }
+
+            try_callback(command_obj.callback, reply);
+        } else if (exports.debug_mode) {
+            console.log("no callback for reply: " + (reply && reply.toString && reply.toString()));
+        }
+    } else if (this.pub_sub_mode || (command_obj && command_obj.sub_command)) {
+        if (Array.isArray(reply)) {
+            type = reply[0].toString();
+
+            if (type === "message") {
+                this.emit("message", reply[1].toString(), reply[2]); // channel, message
+            } else if (type === "pmessage") {
+                this.emit("pmessage", reply[1].toString(), reply[2].toString(), reply[3]); // pattern, channel, message
+            } else if (type === "subscribe" || type === "unsubscribe" || type === "psubscribe" || type === "punsubscribe") {
+                if (reply[2] === 0) {
+                    this.pub_sub_mode = false;
+                    if (this.debug_mode) {
+                        console.log("All subscriptions removed, exiting pub/sub mode");
+                    }
+                } else {
+                    this.pub_sub_mode = true;
+                }
+                // subscribe commands take an optional callback and also emit an event, but only the first response is included in the callback
+                // TODO - document this or fix it so it works in a more obvious way
+                // reply[1] can be null
+                var reply1String = (reply[1] === null) ? null : reply[1].toString();
+                if (command_obj && typeof command_obj.callback === "function") {
+                    try_callback(command_obj.callback, reply1String);
+                }
+                this.emit(type, reply1String, reply[2]); // channel, count
+            } else {
+                throw new Error("subscriptions are active but got unknown reply type " + type);
+            }
+        } else if (! this.closing) {
+            throw new Error("subscriptions are active but got an invalid reply: " + reply);
+        }
+    } else if (this.monitoring) {
+        len = reply.indexOf(" ");
+        timestamp = reply.slice(0, len);
+        argindex = reply.indexOf('"');
+        args = reply.slice(argindex + 1, -1).split('" "').map(function (elem) {
+            return elem.replace(/\\"/g, '"');
+        });
+        this.emit("monitor", timestamp, args);
+    } else {
+        throw new Error("node_redis command queue state error. If you can reproduce this, please report it.");
+    }
+};
+
+// This Command constructor is ever so slightly faster than using an object literal, but more importantly, using
+// a named constructor helps it show up meaningfully in the V8 CPU profiler and in heap snapshots.
+function Command(command, args, sub_command, buffer_args, callback) {
+    this.command = command;
+    this.args = args;
+    this.sub_command = sub_command;
+    this.buffer_args = buffer_args;
+    this.callback = callback;
+}
+
+RedisClient.prototype.send_command = function (command, args, callback) {
+    var arg, command_obj, i, il, elem_count, buffer_args, stream = this.stream, command_str = "", buffered_writes = 0, last_arg_type, lcaseCommand;
+
+    if (typeof command !== "string") {
+        throw new Error("First argument to send_command must be the command name string, not " + typeof command);
+    }
+
+    if (Array.isArray(args)) {
+        if (typeof callback === "function") {
+            // probably the fastest way:
+            //     client.command([arg1, arg2], cb);  (straight passthrough)
+            //         send_command(command, [arg1, arg2], cb);
+        } else if (! callback) {
+            // most people find this variable argument length form more convenient, but it uses arguments, which is slower
+            //     client.command(arg1, arg2, cb);   (wraps up arguments into an array)
+            //       send_command(command, [arg1, arg2, cb]);
+            //     client.command(arg1, arg2);   (callback is optional)
+            //       send_command(command, [arg1, arg2]);
+            //     client.command(arg1, arg2, undefined);   (callback is undefined)
+            //       send_command(command, [arg1, arg2, undefined]);
+            last_arg_type = typeof args[args.length - 1];
+            if (last_arg_type === "function" || last_arg_type === "undefined") {
+                callback = args.pop();
+            }
+        } else {
+            throw new Error("send_command: last argument must be a callback or undefined");
+        }
+    } else {
+        throw new Error("send_command: second argument must be an array");
+    }
+
+    if (callback && process.domain) callback = process.domain.bind(callback);
+
+    // if the last argument is an array and command is sadd or srem, expand it out:
+    //     client.sadd(arg1, [arg2, arg3, arg4], cb);
+    //  converts to:
+    //     client.sadd(arg1, arg2, arg3, arg4, cb);
+    lcaseCommand = command.toLowerCase();
+    if ((lcaseCommand === 'sadd' || lcaseCommand === 'srem') && args.length > 0 && Array.isArray(args[args.length - 1])) {
+        args = args.slice(0, -1).concat(args[args.length - 1]);
+    }
+
+    // if the value is undefined or null and command is set or setx, need not to send message to redis
+    if (command === 'set' || command === 'setex') {
+        if(args[args.length - 1] === undefined || args[args.length - 1] === null) {
+            var err = new Error('send_command: ' + command + ' value must not be undefined or null');
+            return callback && callback(err);
+        }
+    }
+
+    buffer_args = false;
+    for (i = 0, il = args.length, arg; i < il; i += 1) {
+        if (Buffer.isBuffer(args[i])) {
+            buffer_args = true;
+        }
+    }
+
+    command_obj = new Command(command, args, false, buffer_args, callback);
+
+    if ((!this.ready && !this.send_anyway) || !stream.writable) {
+        if (exports.debug_mode) {
+            if (!stream.writable) {
+                console.log("send command: stream is not writeable.");
+            }
+        }
+
+        if (this.enable_offline_queue) {
+            if (exports.debug_mode) {
+                console.log("Queueing " + command + " for next server connection.");
+            }
+            this.offline_queue.push(command_obj);
+            this.should_buffer = true;
+        } else {
+            var not_writeable_error = new Error('send_command: stream not writeable. enable_offline_queue is false');
+            if (command_obj.callback) {
+                command_obj.callback(not_writeable_error);
+            } else {
+                throw not_writeable_error;
+            }
+        }
+
+        return false;
+    }
+
+    if (command === "subscribe" || command === "psubscribe" || command === "unsubscribe" || command === "punsubscribe") {
+        this.pub_sub_command(command_obj);
+    } else if (command === "monitor") {
+        this.monitoring = true;
+    } else if (command === "quit") {
+        this.closing = true;
+    } else if (this.pub_sub_mode === true) {
+        throw new Error("Connection in subscriber mode, only subscriber commands may be used");
+    }
+    this.command_queue.push(command_obj);
+    this.commands_sent += 1;
+
+    elem_count = args.length + 1;
+
+    // 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 = "*" + elem_count + "\r\n$" + command.length + "\r\n" + command + "\r\n";
+
+    if (! buffer_args) { // Build up a string and send entire command in one write
+        for (i = 0, il = args.length, arg; i < il; i += 1) {
+            arg = args[i];
+            if (typeof arg !== "string") {
+                arg = String(arg);
+            }
+            command_str += "$" + Buffer.byteLength(arg) + "\r\n" + arg + "\r\n";
+        }
+        if (exports.debug_mode) {
+            console.log("send " + this.address + " id " + this.connection_id + ": " + command_str);
+        }
+        buffered_writes += !stream.write(command_str);
+    } else {
+        if (exports.debug_mode) {
+            console.log("send command (" + command_str + ") has Buffer arguments");
+        }
+        buffered_writes += !stream.write(command_str);
+
+        for (i = 0, il = args.length, arg; i < il; i += 1) {
+            arg = args[i];
+            if (!(Buffer.isBuffer(arg) || arg instanceof String)) {
+                arg = String(arg);
+            }
+
+            if (Buffer.isBuffer(arg)) {
+                if (arg.length === 0) {
+                    if (exports.debug_mode) {
+                        console.log("send_command: using empty string for 0 length buffer");
+                    }
+                    buffered_writes += !stream.write("$0\r\n\r\n");
+                } else {
+                    buffered_writes += !stream.write("$" + arg.length + "\r\n");
+                    buffered_writes += !stream.write(arg);
+                    buffered_writes += !stream.write("\r\n");
+                    if (exports.debug_mode) {
+                        console.log("send_command: buffer send " + arg.length + " bytes");
+                    }
+                }
+            } else {
+                if (exports.debug_mode) {
+                    console.log("send_command: string send " + Buffer.byteLength(arg) + " bytes: " + arg);
+                }
+                buffered_writes += !stream.write("$" + Buffer.byteLength(arg) + "\r\n" + arg + "\r\n");
+            }
+        }
+    }
+    if (exports.debug_mode) {
+        console.log("send_command buffered_writes: " + buffered_writes, " should_buffer: " + this.should_buffer);
+    }
+    if (buffered_writes || this.command_queue.getLength() >= this.command_queue_high_water) {
+        this.should_buffer = true;
+    }
+    return !this.should_buffer;
+};
+
+RedisClient.prototype.pub_sub_command = function (command_obj) {
+    var i, key, command, args;
+
+    if (this.pub_sub_mode === false && exports.debug_mode) {
+        console.log("Entering pub/sub mode from " + command_obj.command);
+    }
+    this.pub_sub_mode = true;
+    command_obj.sub_command = true;
+
+    command = command_obj.command;
+    args = command_obj.args;
+    if (command === "subscribe" || command === "psubscribe") {
+        if (command === "subscribe") {
+            key = "sub";
+        } else {
+            key = "psub";
+        }
+        for (i = 0; i < args.length; i++) {
+            this.subscription_set[key + " " + args[i]] = true;
+        }
+    } else {
+        if (command === "unsubscribe") {
+            key = "sub";
+        } else {
+            key = "psub";
+        }
+        for (i = 0; i < args.length; i++) {
+            delete this.subscription_set[key + " " + args[i]];
+        }
+    }
+};
+
+RedisClient.prototype.end = function () {
+    this.stream._events = {};
+
+    //clear retry_timer
+    if(this.retry_timer){
+        clearTimeout(this.retry_timer);
+        this.retry_timer=null;
+    }
+    this.stream.on("error", function(){});
+
+    this.connected = false;
+    this.ready = false;
+    this.closing = true;
+    return this.stream.destroySoon();
+};
+
+function Multi(client, args) {
+    this._client = client;
+    this.queue = [["MULTI"]];
+    if (Array.isArray(args)) {
+        this.queue = this.queue.concat(args);
+    }
+}
+
+exports.Multi = Multi;
+
+// take 2 arrays and return the union of their elements
+function set_union(seta, setb) {
+    var obj = {};
+
+    seta.forEach(function (val) {
+        obj[val] = true;
+    });
+    setb.forEach(function (val) {
+        obj[val] = true;
+    });
+    return Object.keys(obj);
+}
+
+// This static list of commands is updated from time to time.  ./lib/commands.js can be updated with generate_commands.js
+commands = set_union(["get", "set", "setnx", "setex", "append", "strlen", "del", "exists", "setbit", "getbit", "setrange", "getrange", "substr",
+    "incr", "decr", "mget", "rpush", "lpush", "rpushx", "lpushx", "linsert", "rpop", "lpop", "brpop", "brpoplpush", "blpop", "llen", "lindex",
+    "lset", "lrange", "ltrim", "lrem", "rpoplpush", "sadd", "srem", "smove", "sismember", "scard", "spop", "srandmember", "sinter", "sinterstore",
+    "sunion", "sunionstore", "sdiff", "sdiffstore", "smembers", "zadd", "zincrby", "zrem", "zremrangebyscore", "zremrangebyrank", "zunionstore",
+    "zinterstore", "zrange", "zrangebyscore", "zrevrangebyscore", "zcount", "zrevrange", "zcard", "zscore", "zrank", "zrevrank", "hset", "hsetnx",
+    "hget", "hmset", "hmget", "hincrby", "hdel", "hlen", "hkeys", "hvals", "hgetall", "hexists", "incrby", "decrby", "getset", "mset", "msetnx",
+    "randomkey", "select", "move", "rename", "renamenx", "expire", "expireat", "keys", "dbsize", "auth", "ping", "echo", "save", "bgsave",
+    "bgrewriteaof", "shutdown", "lastsave", "type", "multi", "exec", "discard", "sync", "flushdb", "flushall", "sort", "info", "monitor", "ttl",
+    "persist", "slaveof", "debug", "config", "subscribe", "unsubscribe", "psubscribe", "punsubscribe", "publish", "watch", "unwatch", "cluster",
+    "restore", "migrate", "dump", "object", "client", "eval", "evalsha"], require("./lib/commands"));
+
+commands.forEach(function (fullCommand) {
+    var command = fullCommand.split(' ')[0];
+
+    RedisClient.prototype[command] = function (args, callback) {
+        if (Array.isArray(args) && typeof callback === "function") {
+            return this.send_command(command, args, callback);
+        } else {
+            return this.send_command(command, to_array(arguments));
+        }
+    };
+    RedisClient.prototype[command.toUpperCase()] = RedisClient.prototype[command];
+
+    Multi.prototype[command] = function () {
+        this.queue.push([command].concat(to_array(arguments)));
+        return this;
+    };
+    Multi.prototype[command.toUpperCase()] = Multi.prototype[command];
+});
+
+// store db in this.select_db to restore it on reconnect
+RedisClient.prototype.select = function (db, callback) {
+    var self = this;
+
+    this.send_command('select', [db], function (err, res) {
+        if (err === null) {
+            self.selected_db = db;
+        }
+        if (typeof(callback) === 'function') {
+            callback(err, res);
+        } else if (err) {
+            self.emit('error', err);
+        }
+    });
+};
+RedisClient.prototype.SELECT = RedisClient.prototype.select;
+
+// Stash auth for connect and reconnect.  Send immediately if already connected.
+RedisClient.prototype.auth = function () {
+    var args = to_array(arguments);
+    this.auth_pass = args[0];
+    this.auth_callback = args[1];
+    if (exports.debug_mode) {
+        console.log("Saving auth as " + this.auth_pass);
+    }
+
+    if (this.connected) {
+        this.send_command("auth", args);
+    }
+};
+RedisClient.prototype.AUTH = RedisClient.prototype.auth;
+
+RedisClient.prototype.hmget = function (arg1, arg2, arg3) {
+    if (Array.isArray(arg2) && typeof arg3 === "function") {
+        return this.send_command("hmget", [arg1].concat(arg2), arg3);
+    } else if (Array.isArray(arg1) && typeof arg2 === "function") {
+        return this.send_command("hmget", arg1, arg2);
+    } else {
+        return this.send_command("hmget", to_array(arguments));
+    }
+};
+RedisClient.prototype.HMGET = RedisClient.prototype.hmget;
+
+RedisClient.prototype.hmset = function (args, callback) {
+    var tmp_args, tmp_keys, i, il, key;
+
+    if (Array.isArray(args) && typeof callback === "function") {
+        return this.send_command("hmset", args, callback);
+    }
+
+    args = to_array(arguments);
+    if (typeof args[args.length - 1] === "function") {
+        callback = args[args.length - 1];
+        args.length -= 1;
+    } else {
+        callback = null;
+    }
+
+    if (args.length === 2 && (typeof args[0] === "string" || typeof args[0] === "number") && typeof args[1] === "object") {
+        // User does: client.hmset(key, {key1: val1, key2: val2})
+        // assuming key is a string, i.e. email address
+
+        // if key is a number, i.e. timestamp, convert to string
+        if (typeof args[0] === "number") {
+            args[0] = args[0].toString();
+        }
+
+        tmp_args = [ args[0] ];
+        tmp_keys = Object.keys(args[1]);
+        for (i = 0, il = tmp_keys.length; i < il ; i++) {
+            key = tmp_keys[i];
+            tmp_args.push(key);
+            tmp_args.push(args[1][key]);
+        }
+        args = tmp_args;
+    }
+
+    return this.send_command("hmset", args, callback);
+};
+RedisClient.prototype.HMSET = RedisClient.prototype.hmset;
+
+Multi.prototype.hmset = function () {
+    var args = to_array(arguments), tmp_args;
+    if (args.length >= 2 && typeof args[0] === "string" && typeof args[1] === "object") {
+        tmp_args = [ "hmset", args[0] ];
+        Object.keys(args[1]).map(function (key) {
+            tmp_args.push(key);
+            tmp_args.push(args[1][key]);
+        });
+        if (args[2]) {
+            tmp_args.push(args[2]);
+        }
+        args = tmp_args;
+    } else {
+        args.unshift("hmset");
+    }
+
+    this.queue.push(args);
+    return this;
+};
+Multi.prototype.HMSET = Multi.prototype.hmset;
+
+Multi.prototype.exec = function (callback) {
+    var self = this;
+    var errors = [];
+    // drain queue, callback will catch "QUEUED" or error
+    // TODO - get rid of all of these anonymous functions which are elegant but slow
+    this.queue.forEach(function (args, index) {
+        var command = args[0], obj;
+        if (typeof args[args.length - 1] === "function") {
+            args = args.slice(1, -1);
+        } else {
+            args = args.slice(1);
+        }
+        if (args.length === 1 && Array.isArray(args[0])) {
+            args = args[0];
+        }
+        if (command.toLowerCase() === 'hmset' && typeof args[1] === 'object') {
+            obj = args.pop();
+            Object.keys(obj).forEach(function (key) {
+                args.push(key);
+                args.push(obj[key]);
+            });
+        }
+        this._client.send_command(command, args, function (err, reply) {
+            if (err) {
+                var cur = self.queue[index];
+                if (typeof cur[cur.length - 1] === "function") {
+                    cur[cur.length - 1](err);
+                } else {
+                    errors.push(new Error(err));
+                }
+            }
+        });
+    }, this);
+
+    // TODO - make this callback part of Multi.prototype instead of creating it each time
+    return this._client.send_command("EXEC", [], function (err, replies) {
+        if (err) {
+            if (callback) {
+                errors.push(new Error(err));
+                callback(errors);
+                return;
+            } else {
+                throw new Error(err);
+            }
+        }
+
+        var i, il, reply, args;
+
+        if (replies) {
+            for (i = 1, il = self.queue.length; i < il; i += 1) {
+                reply = replies[i - 1];
+                args = self.queue[i];
+
+                // TODO - confusing and error-prone that hgetall is special cased in two places
+                if (reply && args[0].toLowerCase() === "hgetall") {
+                    replies[i - 1] = reply = reply_to_object(reply);
+                }
+
+                if (typeof args[args.length - 1] === "function") {
+                    args[args.length - 1](null, reply);
+                }
+            }
+        }
+
+        if (callback) {
+            callback(null, replies);
+        }
+    });
+};
+Multi.prototype.EXEC = Multi.prototype.exec;
+
+RedisClient.prototype.multi = function (args) {
+    return new Multi(this, args);
+};
+RedisClient.prototype.MULTI = function (args) {
+    return new Multi(this, args);
+};
+
+
+// stash original eval method
+var eval_orig = RedisClient.prototype.eval;
+// hook eval with an attempt to evalsha for cached scripts
+RedisClient.prototype.eval = RedisClient.prototype.EVAL = function () {
+    var self = this,
+        args = to_array(arguments),
+        callback;
+
+    if (typeof args[args.length - 1] === "function") {
+        callback = args.pop();
+    }
+
+    if (Array.isArray(args[0])) {
+        args = args[0];
+    }
+
+    // replace script source with sha value
+    var source = args[0];
+    args[0] = crypto.createHash("sha1").update(source).digest("hex");
+
+    self.evalsha(args, function (err, reply) {
+        if (err && /NOSCRIPT/.test(err.message)) {
+            args[0] = source;
+            eval_orig.call(self, args, callback);
+
+        } else if (callback) {
+            callback(err, reply);
+        }
+    });
+};
+
+
+exports.createClient = function(arg0, arg1, arg2){
+    if( arguments.length === 0 ){
+
+        // createClient()
+        return createClient_tcp(default_port, default_host, {});
+
+    } else if( typeof arg0 === 'number' ||
+        typeof arg0 === 'string' && arg0.match(/^\d+$/) ){
+
+        // createClient( 3000, host, options)
+        // createClient('3000', host, options)
+        return createClient_tcp(arg0, arg1, arg2);
+
+    } else if( typeof arg0 === 'string' ){
+
+        // createClient( '/tmp/redis.sock', options)
+        return createClient_unix(arg0,arg1);
+
+    } else if( arg0 !== null && typeof arg0 === 'object' ){
+
+        // createClient(options)
+        return createClient_tcp(default_port, default_host, arg0 );
+
+    } else if( arg0 === null && arg1 === null ){
+
+        // for backward compatibility
+        // createClient(null,null,options)
+        return createClient_tcp(default_port, default_host, arg2);
+
+    } else {
+        throw new Error('unknown type of connection in createClient()');
+    }
+}
+
+var createClient_unix = function(path, options){
+    var cnxOptions = {
+        path: path
+    };
+    var net_client = net.createConnection(cnxOptions);
+    var redis_client = new RedisClient(net_client, options || {});
+
+    redis_client.connectionOption = cnxOptions;
+    redis_client.address = path;
+
+    return redis_client;
+}
+
+var createClient_tcp = function (port_arg, host_arg, options) {
+    var cnxOptions = {
+        'port' : port_arg || default_port,
+        'host' : host_arg || default_host,
+        'family' : (options && options.family === 'IPv6') ? 6 : 4
+    };
+    var net_client = net.createConnection(cnxOptions);
+    var redis_client = new RedisClient(net_client, options || {});
+
+    redis_client.connectionOption = cnxOptions;
+    redis_client.address = cnxOptions.host + ':' + cnxOptions.port;
+
+    return redis_client;
+};
+
+exports.print = function (err, reply) {
+    if (err) {
+        console.log("Error: " + err);
+    } else {
+        console.log("Reply: " + reply);
+    }
+};