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node-red/red/nodes/Node.js

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/**
* Copyright 2014 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.
**/
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var util = require("util");
var EventEmitter = require("events").EventEmitter;
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var when = require("when");
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var redUtil = require("../util");
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var flows = require("./flows");
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var comms = require("../comms");
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function Node(n) {
this.id = n.id;
this.type = n.type;
if (n.name) {
this.name = n.name;
}
flows.add(this);
this.updateWires(n.wires);
}
util.inherits(Node, EventEmitter);
Node.prototype.updateWires = function(wires) {
this.wires = wires || [];
delete this._wire;
var wc = 0;
this.wires.forEach(function(w) {
wc+=w.length;
});
this._wireCount = wc;
if (wc === 0) {
// With nothing wired to the node, no-op send
this.send = function(msg) {}
} else {
this.send = Node.prototype.send;
if (this.wires.length === 1 && this.wires[0].length === 1) {
// Single wire, so we can shortcut the send when
// a single message is sent
this._wire = this.wires[0][0];
}
}
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}
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Node.prototype._on = Node.prototype.on;
Node.prototype.on = function(event, callback) {
var node = this;
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if (event == "close") {
if (callback.length == 1) {
this.close = function() {
return when.promise(function(resolve) {
callback.call(node, function() {
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resolve();
});
});
};
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} else {
this.close = callback;
}
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} else {
this._on(event, callback);
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}
};
Node.prototype.close = function() {};
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Node.prototype.send = function(msg) {
var msgSent = false;
var node;
if (msg === null || typeof msg === "undefined") {
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return;
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} else if (!util.isArray(msg)) {
if (this._wire) {
// A single message and a single wire on output 0
// TODO: pre-load flows.get calls - cannot do in constructor
// as not all nodes are defined at that point
node = flows.get(this._wire);
if (node) {
node.receive(msg);
}
return;
} else {
msg = [msg];
}
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}
var numOutputs = this.wires.length;
// Build a list of send events so that all cloning is done before
// any calls to node.receive
var sendEvents = [];
// for each output of node eg. [msgs to output 0, msgs to output 1, ...]
for (var i = 0; i < numOutputs; i++) {
var wires = this.wires[i]; // wires leaving output i
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if (i < msg.length) {
var msgs = msg[i]; // msgs going to output i
if (msgs !== null && typeof msgs !== "undefined") {
if (!util.isArray(msgs)) {
msgs = [msgs];
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}
var k = 0;
// for each recipent node of that output
for (var j = 0; j < wires.length; j++) {
node = flows.get(wires[j]); // node at end of wire j
if (node) {
// for each msg to send eg. [[m1, m2, ...], ...]
for (k = 0; k < msgs.length; k++) {
if (msgSent) {
sendEvents.push({n:node,m:redUtil.cloneMessage(msgs[k])});
} else {
// first msg sent so don't clone
sendEvents.push({n:node,m:msgs[k]});
msgSent = true;
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}
}
}
}
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}
}
}
for (i=0;i<sendEvents.length;i++) {
var ev = sendEvents[i];
ev.n.receive(ev.m);
}
};
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Node.prototype.receive = function(msg) {
this.emit("input", msg);
};
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function log_helper(self, level, msg) {
var o = {
level: level,
id: self.id,
type: self.type,
msg: msg
};
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if (self.name) {
o.name = self.name;
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}
self.emit("log", o);
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}
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Node.prototype.log = function(msg) {
log_helper(this, 'log', msg);
};
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Node.prototype.warn = function(msg) {
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log_helper(this, 'warn', msg);
};
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Node.prototype.error = function(msg) {
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log_helper(this, 'error', msg);
};
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/**
* status: { fill:"red|green", shape:"dot|ring", text:"blah" }
*/
Node.prototype.status = function(status) {
comms.publish("status/" + this.id, status, true);
};
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module.exports = Node;