/** * Copyright 2013 IBM Corp. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. **/ module.exports = function(RED) { "use strict"; var util = require("util"); var redis = require("redis"); var hashFieldRE = /^([^=]+)=(.*)$/; var redisConnectionPool = function() { var connections = {}; var obj = { get: function(host,port) { var id = host+":"+port; if (!connections[id]) { connections[id] = redis.createClient(port,host); connections[id].on("error",function(err) { util.log("[redis] "+err); }); connections[id].on("connect",function() { util.log("[redis] connected to "+host+":"+port); }); connections[id]._id = id; connections[id]._nodeCount = 0; } connections[id]._nodeCount += 1; return connections[id]; }, close: function(connection) { connection._nodeCount -= 1; if (connection._nodeCount === 0) { if (connection) { clearTimeout(connection.retry_timer); connection.end(); } delete connections[connection._id]; } } }; return obj; }(); function RedisOutNode(n) { RED.nodes.createNode(this,n); this.port = n.port||"6379"; this.hostname = n.hostname||"127.0.0.1"; this.key = n.key; this.structtype = n.structtype; this.client = redisConnectionPool.get(this.hostname,this.port); if (this.client.connected) { this.status({fill:"green",shape:"dot",text:"connected"}); } else { this.status({fill:"red",shape:"ring",text:"disconnected"},true); } var node = this; this.client.on("end", function() { node.status({fill:"red",shape:"ring",text:"disconnected"}); }); this.client.on("connect", function() { node.status({fill:"green",shape:"dot",text:"connected"}); }); this.on("input", function(msg) { if (msg != null) { var k = this.key || msg.topic; if (k) { if (this.structtype == "string") { this.client.set(k,msg.payload); } else if (this.structtype == "hash") { var r = hashFieldRE.exec(msg.payload); if (r) { this.client.hset(k,r[1],r[2]); } else { this.warn("Invalid payload for redis hash"); } } else if (this.structtype == "set") { this.client.sadd(k,msg.payload); } else if (this.structtype == "list") { this.client.rpush(k,msg.payload); } } else { this.warn("No key or topic set"); } } }); this.on("close", function() { redisConnectionPool.close(node.client); }); } RED.nodes.registerType("redis out",RedisOutNode); }