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749 lines
24 KiB
749 lines
24 KiB
/*global Buffer require exports console setTimeout */
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var net = require("net"),
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Commands = require("./lib/commands").Commands,
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util = require("./lib/util").util,
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Queue = require("./lib/queue").Queue,
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to_array = require("./lib/to_array"),
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events = require("events"),
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parsers = [],
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default_port = 6379,
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default_host = "127.0.0.1";
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// can set this to true to enable for all connections
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exports.debug_mode = false;
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// hiredis might not be installed
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try {
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require("./lib/parser/hiredis");
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parsers.push(require("./lib/parser/hiredis"));
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} catch (err) {
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if (exports.debug_mode) {
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console.log("hiredis parser not installed.");
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}
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}
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parsers.push(require("./lib/parser/javascript"));
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function RedisClient(stream, options) {
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this.stream = stream;
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this.options = options || {};
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this.connected = false;
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this.ready = false;
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this.connections = 0;
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this.attempts = 1;
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this.command_queue = new Queue(); // holds sent commands to de-pipeline them
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this.offline_queue = new Queue(); // holds commands issued but not able to be sent
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this.commands_sent = 0;
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this.retry_delay = 250; // inital reconnection delay
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this.current_retry_delay = this.retry_delay;
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this.retry_backoff = 1.7; // each retry waits current delay * retry_backoff
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this.subscriptions = false;
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this.monitoring = false;
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this.closing = false;
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this.server_info = {};
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this.auth_pass = null;
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var parser_module, self = this;
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if (self.options.parser) {
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if (! parsers.some(function (parser) {
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if (parser.name === self.options.parser) {
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parser_module = parser;
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if (exports.debug_mode) {
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console.log("Using parser module: " + parser_module.name);
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}
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return true;
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}
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})) {
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throw new Error("Couldn't find named parser " + self.options.parser + " on this system");
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}
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} else {
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if (exports.debug_mode) {
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console.log("Using default parser module: " + parsers[0].name);
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}
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parser_module = parsers[0];
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}
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parser_module.debug_mode = exports.debug_mode;
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this.reply_parser = new parser_module.Parser({
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return_buffers: self.options.return_buffers || false
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});
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// "reply error" is an error sent back by Redis
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this.reply_parser.on("reply error", function (reply) {
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self.return_error(new Error(reply));
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});
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this.reply_parser.on("reply", function (reply) {
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self.return_reply(reply);
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});
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// "error" is bad. Somehow the parser got confused. It'll try to reset and continue.
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this.reply_parser.on("error", function (err) {
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self.emit("error", new Error("Redis reply parser error: " + err.stack));
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});
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this.stream.on("connect", function () {
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self.on_connect();
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});
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this.stream.on("data", function (buffer_from_socket) {
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self.on_data(buffer_from_socket);
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});
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this.stream.on("error", function (msg) {
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if (this.closing) {
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return;
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}
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var message = "Redis connection to " + self.host + ":" + self.port + " failed - " + msg.message;
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if (exports.debug_mode) {
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console.warn(message);
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}
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self.offline_queue.forEach(function (args) {
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if (typeof args[2] === "function") {
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args[2](message);
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}
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});
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self.offline_queue = new Queue();
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self.command_queue.forEach(function (args) {
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if (typeof args[2] === "function") {
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args[2](message);
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}
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});
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self.command_queue = new Queue();
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self.connected = false;
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self.ready = false;
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self.emit("error", new Error(message));
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// "error" events get turned into exceptions if they aren't listened for. If the user handled this error
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// then we should try to reconnect.
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self.connection_gone("error");
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});
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this.stream.on("close", function () {
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self.connection_gone("close");
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});
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this.stream.on("end", function () {
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self.connection_gone("end");
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});
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this.stream.on("drain", function () {
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self.emit("drain");
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});
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events.EventEmitter.call(this);
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}
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util.inherits(RedisClient, events.EventEmitter);
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exports.RedisClient = RedisClient;
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RedisClient.prototype.on_connect = function () {
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if (exports.debug_mode) {
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console.log("Stream connected " + this.host + ":" + this.port + " fd " + this.stream.fd);
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}
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var self = this;
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this.connected = true;
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this.ready = false;
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this.attempts = 0;
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this.connections += 1;
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this.command_queue = new Queue();
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this.emitted_end = false;
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this.retry_timer = null;
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this.current_retry_delay = this.retry_time;
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this.stream.setNoDelay();
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this.stream.setTimeout(0);
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if (this.auth_pass) {
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if (exports.debug_mode) {
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console.log("Sending auth to " + this.host + ":" + this.port + " fd " + this.stream.fd);
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}
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self.send_anyway = true;
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self.send_command("auth", this.auth_pass, function (err, res) {
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if (err) {
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return self.emit("error", "Auth error: " + err);
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}
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if (res.toString() !== "OK") {
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return self.emit("error", "Auth failed: " + res.toString());
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}
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if (exports.debug_mode) {
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console.log("Auth succeeded " + self.host + ":" + self.port + " fd " + self.stream.fd);
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}
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if (self.auth_callback) {
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self.auth_callback(err, res);
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self.auth_callback = null;
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}
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});
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self.send_anyway = false;
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}
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this.emit("connect");
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if (this.options.no_ready_check) {
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this.ready = true;
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this.send_offline_queue();
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} else {
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this.ready_check();
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}
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};
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RedisClient.prototype.ready_check = function () {
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var self = this;
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function send_info_cmd() {
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if (exports.debug_mode) {
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console.log("checking server ready state...");
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}
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self.send_anyway = true; // secret flag to send_command to send something even if not "ready"
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self.info(function (err, res) {
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if (err) {
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return self.emit("error", "Ready check failed: " + err);
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}
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var lines = res.toString().split("\r\n"), obj = {}, retry_time;
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lines.forEach(function (line) {
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var parts = line.split(':');
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if (parts[1]) {
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obj[parts[0]] = parts[1];
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}
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});
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obj.versions = [];
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obj.redis_version.split('.').forEach(function (num) {
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obj.versions.push(+num);
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});
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// expose info key/vals to users
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self.server_info = obj;
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if (!obj.loading || (obj.loading && obj.loading === "0")) {
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if (exports.debug_mode) {
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console.log("Redis server ready.");
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}
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self.ready = true;
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self.send_offline_queue();
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self.emit("ready");
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} else {
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retry_time = obj.loading_eta_seconds * 1000;
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if (retry_time > 1000) {
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retry_time = 1000;
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}
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if (exports.debug_mode) {
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console.log("Redis server still loading, trying again in " + retry_time);
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}
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setTimeout(send_info_cmd, retry_time);
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}
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});
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self.send_anyway = false;
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}
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send_info_cmd();
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};
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RedisClient.prototype.send_offline_queue = function () {
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var command_obj;
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while (this.offline_queue.length > 0) {
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command_obj = this.offline_queue.shift();
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if (exports.debug_mode) {
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console.log("Sending offline command: " + command_obj.command);
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}
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this.send_command(command_obj.command, command_obj.args, command_obj.callback);
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}
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this.offline_queue = new Queue();
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// Even though items were shifted off, Queue backing store still uses memory until next add
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};
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RedisClient.prototype.connection_gone = function (why) {
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var self = this;
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// If a retry is already in progress, just let that happen
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if (this.retry_timer) {
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return;
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}
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// Note that this may trigger another "close" or "end" event
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this.stream.destroy();
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if (exports.debug_mode) {
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console.warn("Redis connection is gone from " + why + " event.");
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}
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this.connected = false;
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this.ready = false;
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this.subscriptions = false;
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this.monitoring = false;
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// since we are collapsing end and close, users don't expect to be called twice
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if (! this.emitted_end) {
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this.emit("end");
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this.emitted_end = true;
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}
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this.command_queue.forEach(function (args) {
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if (typeof args[2] === "function") {
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args[2]("Server connection closed");
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}
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});
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this.command_queue = new Queue();
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// If this is a requested shutdown, then don't retry
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if (this.closing) {
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this.retry_timer = null;
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return;
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}
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this.current_retry_delay = this.retry_delay * this.retry_backoff;
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if (exports.debug_mode) {
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console.log("Retry connection in " + this.current_retry_delay + " ms");
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}
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this.attempts += 1;
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this.emit("reconnecting", {
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delay: this.current_retry_delay,
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attempt: this.attempts
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});
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this.retry_timer = setTimeout(function () {
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if (exports.debug_mode) {
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console.log("Retrying connection...");
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}
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self.stream.connect(self.port, self.host);
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self.retry_timer = null;
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}, this.current_retry_delay);
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};
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RedisClient.prototype.on_data = function (data) {
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if (exports.debug_mode) {
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console.log("net read " + this.host + ":" + this.port + " fd " + this.stream.fd + ": " + data.toString());
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}
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try {
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this.reply_parser.execute(data);
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} catch (err) {
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// This is an unexpected parser problem, an exception that came from the parser code itself.
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// Parser should emit "error" events if it notices things are out of whack.
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// Callbacks that throw exceptions will land in return_reply(), below.
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// TODO - it might be nice to have a different "error" event for different types of errors
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this.emit("error", err);
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}
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};
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RedisClient.prototype.return_error = function (err) {
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var command_obj = this.command_queue.shift();
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if (this.subscriptions === false && this.command_queue.length === 0) {
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this.emit("idle");
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this.command_queue = new Queue();
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}
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if (command_obj && typeof command_obj.callback === "function") {
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try {
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command_obj.callback(err);
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} catch (callback_err) {
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// if a callback throws an exception, re-throw it on a new stack so the parser can keep going
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process.nextTick(function () {
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throw callback_err;
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});
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}
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} else {
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console.log("node_redis: no callback to send error: " + err.message);
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// this will probably not make it anywhere useful, but we might as well throw
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process.nextTick(function () {
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throw err;
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});
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}
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};
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RedisClient.prototype.return_reply = function (reply) {
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var command_obj = this.command_queue.shift(),
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obj, i, len, key, val, type, timestamp, args;
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if (this.subscriptions === false && this.command_queue.length === 0) {
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this.emit("idle");
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this.command_queue = new Queue();
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}
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if (command_obj && !command_obj.sub_command) {
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if (typeof command_obj.callback === "function") {
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// HGETALL special case replies with keyed Buffers
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if (reply && 'hgetall' === command_obj.command.toLowerCase()) {
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obj = {};
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for (i = 0, len = reply.length; i < len; i += 2) {
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key = reply[i].toString();
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val = reply[i + 1];
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obj[key] = val;
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}
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reply = obj;
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}
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try {
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command_obj.callback(null, reply);
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} catch (err) {
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// if a callback throws an exception, re-throw it on a new stack so the parser can keep going
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process.nextTick(function () {
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throw err;
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});
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}
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} else if (exports.debug_mode) {
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console.log("no callback for reply: " + (reply && reply.toString && reply.toString()));
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}
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} else if (this.subscriptions || command_obj.sub_command) {
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if (Array.isArray(reply)) {
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type = reply[0].toString();
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if (type === "message") {
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this.emit("message", reply[1].toString(), reply[2]); // channel, message
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} else if (type === "pmessage") {
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this.emit("pmessage", reply[1].toString(), reply[2].toString(), reply[3]); // pattern, channel, message
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} else if (type === "subscribe" || type === "unsubscribe" || type === "psubscribe" || type === "punsubscribe") {
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if (reply[2] === 0) {
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this.subscriptions = false;
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if (this.debug_mode) {
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console.log("All subscriptions removed, exiting pub/sub mode");
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}
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}
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this.emit(type, reply[1].toString(), reply[2]); // channel, count
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} else {
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throw new Error("subscriptions are active but got unknown reply type " + type);
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}
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} else if (! this.closing) {
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throw new Error("subscriptions are active but got an invalid reply: " + reply);
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}
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} else if (this.monitoring) {
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len = reply.indexOf(" ");
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timestamp = reply.slice(0, len);
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args = reply.slice(len + 1).match(/"[^"]+"/g).map(function (elem) {
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return elem.replace(/"/g, "");
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});
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this.emit("monitor", timestamp, args);
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} else {
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throw new Error("node_redis command queue state error. If you can reproduce this, please report it.");
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}
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};
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RedisClient.prototype.send_command = function () {
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var command, callback, arg, args, this_args, command_obj, i, il,
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elem_count, stream = this.stream, buffer_args, command_str = "";
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this_args = to_array(arguments);
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if (this_args.length === 0) {
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throw new Error("send_command: not enough arguments");
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}
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if (typeof this_args[0] !== "string") {
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throw new Error("First argument of send_command must be the command name");
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}
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command = this_args[0].toLowerCase();
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if (this_args[1] && Array.isArray(this_args[1])) {
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args = this_args[1];
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if (typeof this_args[2] === "function") {
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callback = this_args[2];
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}
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} else {
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if (typeof this_args[this_args.length - 1] === "function") {
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callback = this_args[this_args.length - 1];
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args = this_args.slice(1, this_args.length - 1);
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} else {
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args = this_args.slice(1, this_args.length);
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}
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}
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if (args.length === 2 && Array.isArray(args[1])) {
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args = [args[0]].concat(args[1]);
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}
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command_obj = {
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command: command,
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args: args,
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callback: callback,
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sub_command: false
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};
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if (!this.ready && !this.send_anyway) {
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if (exports.debug_mode) {
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console.log("Queueing " + command + " for next server connection.");
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}
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this.offline_queue.push(command_obj);
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return;
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}
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if (command === "subscribe" || command === "psubscribe" || command === "unsubscribe" || command === "punsubscribe") {
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if (this.subscriptions === false && exports.debug_mode) {
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console.log("Entering pub/sub mode from " + command);
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}
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command_obj.sub_command = true;
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this.subscriptions = true;
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} else if (command === "monitor") {
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this.monitoring = true;
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} else if (command === "quit") {
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this.closing = true;
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} else if (this.subscriptions === true) {
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throw new Error("Connection in pub/sub mode, only pub/sub commands may be used");
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}
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this.command_queue.push(command_obj);
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this.commands_sent += 1;
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elem_count = 1;
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buffer_args = false;
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elem_count += args.length;
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// Probably should just scan this like a normal person. This is clever, but might be slow.
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buffer_args = args.some(function (arg) {
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return arg instanceof Buffer;
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});
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// 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.
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// Also, why am I putting user documentation in the library source code?
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command_str = "*" + elem_count + "\r\n$" + command.length + "\r\n" + command + "\r\n";
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|
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if (! stream.writable && exports.debug_mode) {
|
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console.log("send command: stream is not writeable, should get a close event next tick.");
|
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return;
|
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}
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|
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if (! buffer_args) { // Build up a string and send entire command in one write
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for (i = 0, il = args.length, arg; i < il; i += 1) {
|
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arg = args[i];
|
|
if (typeof arg !== "string") {
|
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arg = String(arg);
|
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}
|
|
command_str += "$" + Buffer.byteLength(arg) + "\r\n" + arg + "\r\n";
|
|
}
|
|
if (exports.debug_mode) {
|
|
console.log("send " + this.host + ":" + this.port + " fd " + this.stream.fd + ": " + command_str);
|
|
}
|
|
stream.write(command_str);
|
|
} else {
|
|
if (exports.debug_mode) {
|
|
console.log("send command: " + command_str);
|
|
console.log("send command has Buffer arguments");
|
|
}
|
|
stream.write(command_str);
|
|
|
|
for (i = 0, il = args.length, arg; i < il; i += 1) {
|
|
arg = args[i];
|
|
if (!(arg instanceof Buffer || arg instanceof String)) {
|
|
arg = String(arg);
|
|
}
|
|
|
|
if (arg instanceof Buffer) {
|
|
if (arg.length === 0) {
|
|
if (exports.debug_mode) {
|
|
console.log("Using empty string for 0 length buffer");
|
|
}
|
|
stream.write("$0\r\n\r\n");
|
|
} else {
|
|
stream.write("$" + arg.length + "\r\n");
|
|
stream.write(arg);
|
|
stream.write("\r\n");
|
|
}
|
|
} else {
|
|
stream.write("$" + Buffer.byteLength(arg) + "\r\n" + arg + "\r\n");
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
RedisClient.prototype.end = function () {
|
|
this.stream._events = {};
|
|
this.connected = false;
|
|
this.ready = false;
|
|
return this.stream.end();
|
|
};
|
|
|
|
|
|
function Multi(client, args) {
|
|
this.client = client;
|
|
this.queue = [["MULTI"]];
|
|
if (Array.isArray(args)) {
|
|
this.queue = this.queue.concat(args);
|
|
}
|
|
}
|
|
|
|
Commands.forEach(function (command) {
|
|
RedisClient.prototype[command] = function () {
|
|
var args = to_array(arguments);
|
|
args.unshift(command); // put command at the beginning
|
|
this.send_command.apply(this, args);
|
|
};
|
|
RedisClient.prototype[command.toUpperCase()] = RedisClient.prototype[command];
|
|
|
|
Multi.prototype[command] = function () {
|
|
var args = to_array(arguments);
|
|
args.unshift(command);
|
|
this.queue.push(args);
|
|
return this;
|
|
};
|
|
Multi.prototype[command.toUpperCase()] = Multi.prototype[command];
|
|
});
|
|
|
|
// 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) {
|
|
args.unshift("auth");
|
|
this.send_command.apply(this, args);
|
|
}
|
|
};
|
|
RedisClient.prototype.AUTH = RedisClient.prototype.auth;
|
|
|
|
RedisClient.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.send_command.apply(this, args);
|
|
};
|
|
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;
|
|
|
|
// drain queue, callback will catch "QUEUED" or error
|
|
// Can't use a for loop here, as we need closure around the index.
|
|
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 === '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 {
|
|
throw new Error(err);
|
|
}
|
|
self.queue.splice(index, 1);
|
|
}
|
|
});
|
|
}, this);
|
|
|
|
this.client.send_command("EXEC", function (err, replies) {
|
|
if (err) {
|
|
if (callback) {
|
|
callback(new Error(err));
|
|
return;
|
|
} else {
|
|
throw new Error(err);
|
|
}
|
|
}
|
|
|
|
var i, il, j, jl, reply, args, obj, key, val;
|
|
|
|
if (replies) {
|
|
for (i = 1, il = self.queue.length; i < il; i += 1) {
|
|
reply = replies[i - 1];
|
|
args = self.queue[i];
|
|
|
|
// Convert HGETALL reply to object
|
|
if (reply && args[0].toLowerCase() === "hgetall") {
|
|
obj = {};
|
|
for (j = 0, jl = reply.length; j < jl; j += 2) {
|
|
key = reply[j].toString();
|
|
val = reply[j + 1];
|
|
obj[key] = val;
|
|
}
|
|
replies[i - 1] = reply = obj;
|
|
}
|
|
|
|
if (typeof args[args.length - 1] === "function") {
|
|
args[args.length - 1](null, reply);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (callback) {
|
|
callback(null, replies);
|
|
}
|
|
});
|
|
};
|
|
|
|
RedisClient.prototype.multi = function (args) {
|
|
return new Multi(this, args);
|
|
};
|
|
RedisClient.prototype.MULTI = function (args) {
|
|
return new Multi(this, args);
|
|
};
|
|
|
|
exports.createClient = function (port_arg, host_arg, options) {
|
|
var port = port_arg || default_port,
|
|
host = host_arg || default_host,
|
|
redis_client, net_client;
|
|
|
|
net_client = net.createConnection(port, host);
|
|
|
|
redis_client = new RedisClient(net_client, options);
|
|
|
|
redis_client.port = port;
|
|
redis_client.host = host;
|
|
|
|
return redis_client;
|
|
};
|
|
|
|
exports.print = function (err, reply) {
|
|
if (err) {
|
|
console.log("Error: " + err);
|
|
} else {
|
|
console.log("Reply: " + reply);
|
|
}
|
|
};
|
|
|