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var net = require('net'),
utils = require('./utils'),
Parser = require('./parser');
var RedisClient = function RedisClient(port, host, auth) {
this.host = host;
this.port = port;
this.auth = auth;
this.stream = net.createConnection(port, host);;
this.connected = false;
// Pub/sub monitor etc.
this.blocking = false;
// Command queue.
this.max_size = 1300;
this.command = '';
this.commands = new utils.Queue();
// For the retry timer.
this.retry = false;
this.retry_attempts = 0;
this.retry_delay = 250;
this.retry_backoff = 1.7;
// If we want to quit.
this.quitting = false;
// For when we have a full send buffer.
this.paused = false;
this.send_buffer = [];
this.flushing = false;
var self = this;
this.stream.on("connect", function () {
// Reset the retry backoff.
self.retry = false;
self.retry_delay = 250;
self.retry_attempts = 0;
self.stream.setNoDelay();
self.stream.setTimeout(0);
self.connected = true;
// Resend commands if we need to.
var command,
commands = self.commands.array.slice(self.commands.offset);
// Send auth.
if (self.auth) {
commands.unshift(['AUTH', [self.auth], null]);
}
self.commands = new utils.Queue();
for (var i = 0, il = commands.length; i < il; i++) {
command = commands[i];
self.sendCommand(command[0], command[1], command[2]);
}
// give connect listeners a chance to run first in case they need to auth
self.emit("connect");
});
this.stream.on("data", function (buffer) {
try {
self.parser.onIncoming(buffer);
} catch (err) {
self.emit("error", err);
// Reset state.
self.parser.resetState();
}
});
// _write
// So we can pipeline requests.
this._flush = function () {
if ('' !== self.command) {
self.send_buffer.push(self.command);
self.command = '';
}
for (var i = 0, il = self.send_buffer.length; i < il; i++) {
if (!self.stream.writable || false === self.stream.write(self.send_buffer[i])) {
return self.send_buffer = self.send_buffer.slice(i + 1);
}
}
self.send_buffer.length = 0;
self.paused = self.flushing = false;
};
// When we can write more.
this.stream.on('drain', this._flush);
this.stream.on("error", function (error) {
self.emit("error", error);
});
var onClose = function onClose () {
// Ignore if we are already retrying. Or we want to quit.
if (self.retry) return;
self.emit('end');
self.emit('close');
if (self.quitting) return;
self.onDisconnect();
};
this.stream.on("end", onClose);
this.stream.on("close", onClose);
// Setup the parser.
this.parser = new Parser();
this.parser.on('reply', function onReply (reply) {
if (false !== self.blocking) {
if ('pubsub' === self.blocking) {
var type = reply[0].toString();
switch (type) {
case 'psubscribe':
case 'punsubscribe':
case 'subscribe':
case 'unsubscribe':
var channel = reply[1].toString(),
count = reply[2];
if (0 === count) {
self.blocking = false;
}
self.emit(type, channel, count);
self.emit(type + ':' + channel, count);
break;
case 'message':
var key = reply[1].toString(),
data = reply[2];
self.emit('message', key, data);
self.emit('message:' + key, data);
break;
case 'pmessage':
var pattern = reply[1].toString(),
key = reply[2].toString(),
data = reply[3];
self.emit('pmessage', pattern, key, data);
self.emit('pmessage:' + pattern, key, data);
break;
}
} else {
self.emit('data', reply);
}
return;
}
var command = self.commands.shift();
if (command) {
switch (command[0]) {
case 'MONITOR':
self.blocking = true;
break;
case 'SUBSCRIBE':
case 'PSUBSCRIBE':
self.blocking = 'pubsub';
onReply(reply);
return;
}
if (command[2]) {
command[2](null, reply);
}
}
});
// DB error
this.parser.on('error', function (error) {
var command = self.commands.shift();
error = new Error(error);
if (command && command[2]) command[2](error);
else self.emit('error', error);
});
process.EventEmitter.call(this);
return this;
};
RedisClient.prototype = Object.create(process.EventEmitter.prototype);
// Exports
exports.RedisClient = RedisClient;
// createClient
exports.createClient = function createClient (port, host, auth) {
return new RedisClient(port || 6379, host, auth);
};
RedisClient.prototype.connect = function () {
return this.stream.connect();
};
RedisClient.prototype.onDisconnect = function (error) {
var self = this;
// Make sure the stream is reset.
this.connected = false;
this.stream.destroy();
this.parser.resetState();
// Increment the attempts, so we know what to set the timeout to.
this.retry_attempts++;
// Set the retry timer.
setTimeout(function () {
self.stream.connect(self.port, self.host);
}, this.retry_delay);
this.retry_delay *= this.retry_backoff;
this.retry = true;
};
RedisClient.prototype._write = function (data) {
if (!this.paused) {
if (false === this.stream.write(data)) {
this.paused = true;
}
} else {
this.send_buffer.push(data);
}
};
// We use this so we can watch for a full send buffer.
RedisClient.prototype.write = function write (data, buffer) {
if (true !== buffer) {
this.command += data;
if (this.max_size <= this.command.length) {
this._write(this.command);
this.command = '';
}
} else {
if ('' !== this.command) {
this._write(this.command);
this.command = '';
}
this._write(data);
}
if (!this.flushing) {
process.nextTick(this._flush);
this.flushing = true;
}
};
// We make some assumptions:
//
// * command WILL be uppercase and valid.
// * args IS an array
RedisClient.prototype.sendCommand = function (command, args, callback) {
// Push the command to the stack.
if (false === this.blocking) {
this.commands.push([command, args, callback]);
}
// Writable?
if (false === this.connected) return;
// Do we have to send a multi bulk command?
// Assume it is a valid command for speed reasons.
var args_length;
if (args && 0 < (args_length = args.length)) {
var arg, arg_type, last,
previous = '*' + (args_length + 1) + '\r\n' + '$' + command.length + '\r\n' + command + '\r\n';
for (i = 0, il = args_length; i < il; i++) {
arg = args[i];
arg_type = typeof arg;
if ('string' === arg_type) {
// We can send this in one go.
previous += '$' + Buffer.byteLength(arg) + '\r\n' + arg + '\r\n';
} else if ('number' === arg_type) {
// We can send this in one go.
previous += '$' + ('' + arg).length + '\r\n' + arg + '\r\n';
} else if (null === arg || 'undefined' === arg_type) {
// Send NIL
this.write(previous + '$0\r\n\r\n');
previous = '';
} else {
// Assume we are a buffer.
previous += '$' + arg.length + '\r\n';
this.write(previous);
this.write(arg, true);
previous = '\r\n';
}
}
// Anything left?
this.write(previous);
} else {
// We are just sending a stand alone command.
this.write(command_buffers[command]);
}
};
RedisClient.prototype.quit = RedisClient.prototype.end =
function () {
this.quitting = true;
return this.sendCommand('QUIT');
};
RedisClient.prototype.destroy = function () {
this.quitting = true;
return this.stream.destroy();
};
// http://redis.io/commands.json
exports.commands = [
'APPEND', 'AUTH', 'BGREWRITEAOF', 'BGSAVE', 'BLPOP', 'BRPOP', 'BRPOPLPUSH', 'CONFIG GET',
'CONFIG SET', 'CONFIG RESETSTAT', 'DBSIZE', 'DEBUG OBJECT', 'DEBUG SEGFAULT', 'DECR',
'DECRBY', 'DEL', 'DISCARD', 'ECHO', 'EXEC', 'EXISTS', 'EXPIRE', 'EXPIREAT', 'FLUSHALL',
'FLUSHDB', 'GET', 'GETBIT', 'GETRANGE', 'GETSET', 'HDEL', 'HEXISTS', 'HGET', 'HGETALL',
'HINCRBY', 'HKEYS', 'HLEN', 'HMGET', 'HMSET', 'HSET', 'HSETNX', 'HVALS', 'INCR', 'INCRBY',
'INFO', 'KEYS', 'LASTSAVE', 'LINDEX', 'LINSERT', 'LLEN', 'LPOP', 'LPUSH', 'LPUSHX', 'LRANGE',
'LREM', 'LSET', 'LTRIM', 'MGET', 'MONITOR', 'MOVE', 'MSET', 'MSETNX', 'MULTI', 'PERSIST',
'PING', 'PSUBSCRIBE', 'PUBLISH', 'PUNSUBSCRIBE', /* 'QUIT', */ 'RANDOMKEY', 'RENAME', 'RENAMENX',
'RPOP', 'RPOPLPUSH', 'RPUSH', 'RPUSHX', 'SADD', 'SAVE', 'SCARD', 'SDIFF', 'SDIFFSTORE', 'SELECT',
'SET', 'SETBIT', 'SETEX', 'SETNX', 'SETRANGE', 'SHUTDOWN', 'SINTER', 'SINTERSTORE', 'SISMEMBER',
'SLAVEOF', 'SMEMBERS', 'SMOVE', 'SORT', 'SPOP', 'SRANDMEMBER', 'SREM', 'STRLEN', 'SUBSCRIBE',
'SUNION', 'SUNIONSTORE', 'SYNC', 'TTL', 'TYPE', 'UNSUBSCRIBE', 'UNWATCH', 'WATCH', 'ZADD',
'ZCARD', 'ZCOUNT', 'ZINCRBY', 'ZINTERSTORE', 'ZRANGE', 'ZRANGEBYSCORE', 'ZRANK', 'ZREM',
'ZREMRANGEBYRANK', 'ZREMRANGEBYSCORE', 'ZREVRANGE', 'ZREVRANGEBYSCORE', 'ZREVRANK', 'ZSCORE',
'ZUNIONSTORE'
];
this.blocking_commands = ["MONITOR"];
// For each command, make a buffer for it.
var command_buffers = {};
exports.commands.forEach(function (command) {
// Pre-alloc buffers for non-multi commands.
command_buffers[command] = new Buffer('*1\r\n$' + command.length + '\r\n' + command + '\r\n');
// Don't override stuff.
if (!RedisClient.prototype[command.toLowerCase()]) {
RedisClient.prototype[command.toLowerCase()] = function (array, fn) {
// An array of args.
// Assume we only have two args.
if (Array.isArray(array)) {
return this.sendCommand(command, array, fn);
}
// Arbitary amount of arguments.
callback = typeof arguments[arguments.length - 1] === 'function';
args = utils.toArray(arguments);
if (true === callback) {
callback = args.pop();
} else {
callback = null;
}
return this.sendCommand(command, args, callback);
};
}
});