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node-red-nodes/storage/redis/65-redisout.js

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module.exports = function(RED) {
"use strict";
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) {
RED.log.error(err);
});
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:"node-red:common.status.connected"});
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}
else {
this.status({fill:"red",shape:"ring",text:"node-red:common.status.disconnected"},true);
}
var node = this;
this.client.on("end", function() {
node.status({fill:"red",shape:"ring",text:"node-red:common.status.disconnected"});
});
this.client.on("connect", function() {
node.status({fill:"green",shape:"dot",text:"node-red:common.status.connected"});
});
this.on("input", function(msg) {
var k = this.key || msg.topic;
if (k) {
if (this.structtype == "string") {
this.client.set(k,RED.util.ensureString(msg.payload));
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}
else if (this.structtype == "hash") {
if (typeof msg.payload == "object") {
this.client.hmset(k,msg.payload);
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}
else {
var r = hashFieldRE.exec(msg.payload);
if (r) {
this.client.hset(k,r[1],r[2]);
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}
else {
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this.warn(RED._("redisout.errors.invalidpayload"));
}
}
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}
else if (this.structtype == "set") {
this.client.sadd(k,msg.payload);
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}
else if (this.structtype == "list") {
this.client.rpush(k,msg.payload);
}
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}
else {
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this.warn(RED._("redisout.errors.nokey"));
}
});
this.on("close", function() {
redisConnectionPool.close(node.client);
});
}
RED.nodes.registerType("redis out",RedisOutNode);
}