mirror of
https://github.com/node-red/node-red.git
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308 lines
8.6 KiB
JavaScript
308 lines
8.6 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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var util = require("util");
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var EventEmitter = require("events").EventEmitter;
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var redUtil = require("@node-red/util").util;
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var Log = require("@node-red/util").log; // TODO: separate module
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var context = require("./context");
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var flows = require("./flows");
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function Node(n) {
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this.id = n.id;
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this.type = n.type;
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this.z = n.z;
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this._closeCallbacks = [];
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if (n.name) {
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this.name = n.name;
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}
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if (n._alias) {
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this._alias = n._alias;
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}
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if (n._flow) {
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this._flow = n._flow;
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}
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this.updateWires(n.wires);
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}
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util.inherits(Node, EventEmitter);
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Node.prototype.updateWires = function(wires) {
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//console.log("UPDATE",this.id);
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this.wires = wires || [];
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delete this._wire;
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var wc = 0;
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this.wires.forEach(function(w) {
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wc+=w.length;
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});
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this._wireCount = wc;
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if (wc === 0) {
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// With nothing wired to the node, no-op send
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this.send = function(msg) {}
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} else {
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this.send = Node.prototype.send;
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if (this.wires.length === 1 && this.wires[0].length === 1) {
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// Single wire, so we can shortcut the send when
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// a single message is sent
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this._wire = this.wires[0][0];
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}
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}
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}
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Node.prototype.context = function() {
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if (!this._context) {
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this._context = context.get(this._alias||this.id,this.z);
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}
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return this._context;
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}
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Node.prototype._on = Node.prototype.on;
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Node.prototype.on = function(event, callback) {
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var node = this;
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if (event == "close") {
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this._closeCallbacks.push(callback);
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} else {
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this._on(event, callback);
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}
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};
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Node.prototype.close = function(removed) {
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//console.log(this.type,this.id,removed);
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var promises = [];
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var node = this;
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for (var i=0;i<this._closeCallbacks.length;i++) {
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var callback = this._closeCallbacks[i];
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if (callback.length > 0) {
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promises.push(
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new Promise((resolve) => {
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try {
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var args = [];
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if (callback.length === 2) {
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args.push(!!removed);
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}
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args.push(() => {
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resolve();
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});
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callback.apply(node, args);
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} catch(err) {
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// TODO: error thrown in node async close callback
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// We've never logged this properly.
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resolve();
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}
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})
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);
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} else {
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try {
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callback.call(node);
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} catch(err) {
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// TODO: error thrown in node sync close callback
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// We've never logged this properly.
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}
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}
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}
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if (promises.length > 0) {
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return Promise.all(promises).then(function() {
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if (this._context) {
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return context.delete(this._alias||this.id,this.z);
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}
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});
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} else {
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if (this._context) {
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return context.delete(this._alias||this.id,this.z);
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}
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return Promise.resolve();
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}
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};
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Node.prototype.send = function(msg) {
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var msgSent = false;
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var node;
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if (msg === null || typeof msg === "undefined") {
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return;
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} else if (!util.isArray(msg)) {
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if (this._wire) {
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// A single message and a single wire on output 0
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// TODO: pre-load flows.get calls - cannot do in constructor
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// as not all nodes are defined at that point
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if (!msg._msgid) {
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msg._msgid = redUtil.generateId();
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}
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this.metric("send",msg);
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node = this._flow.getNode(this._wire);
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/* istanbul ignore else */
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if (node) {
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node.receive(msg);
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}
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return;
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} else {
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msg = [msg];
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}
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}
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var numOutputs = this.wires.length;
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// Build a list of send events so that all cloning is done before
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// any calls to node.receive
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var sendEvents = [];
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var sentMessageId = null;
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// for each output of node eg. [msgs to output 0, msgs to output 1, ...]
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for (var i = 0; i < numOutputs; i++) {
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var wires = this.wires[i]; // wires leaving output i
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/* istanbul ignore else */
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if (i < msg.length) {
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var msgs = msg[i]; // msgs going to output i
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if (msgs !== null && typeof msgs !== "undefined") {
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if (!util.isArray(msgs)) {
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msgs = [msgs];
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}
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var k = 0;
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// for each recipent node of that output
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for (var j = 0; j < wires.length; j++) {
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node = this._flow.getNode(wires[j]); // node at end of wire j
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if (node) {
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// for each msg to send eg. [[m1, m2, ...], ...]
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for (k = 0; k < msgs.length; k++) {
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var m = msgs[k];
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if (m !== null && m !== undefined) {
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/* istanbul ignore else */
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if (!sentMessageId) {
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sentMessageId = m._msgid;
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}
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if (msgSent) {
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var clonedmsg = redUtil.cloneMessage(m);
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sendEvents.push({n:node,m:clonedmsg});
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} else {
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sendEvents.push({n:node,m:m});
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msgSent = true;
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}
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}
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}
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}
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}
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}
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}
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}
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/* istanbul ignore else */
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if (!sentMessageId) {
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sentMessageId = redUtil.generateId();
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}
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this.metric("send",{_msgid:sentMessageId});
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for (i=0;i<sendEvents.length;i++) {
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var ev = sendEvents[i];
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/* istanbul ignore else */
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if (!ev.m._msgid) {
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ev.m._msgid = sentMessageId;
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}
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ev.n.receive(ev.m);
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}
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};
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Node.prototype.receive = function(msg) {
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if (!msg) {
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msg = {};
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}
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if (!msg._msgid) {
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msg._msgid = redUtil.generateId();
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}
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this.metric("receive",msg);
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try {
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this.emit("input", msg);
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} catch(err) {
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this.error(err,msg);
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}
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};
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function log_helper(self, level, msg) {
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var o = {
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level: level,
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id: self.id,
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type: self.type,
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msg: msg
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};
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if (self._alias) {
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o._alias = self._alias;
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}
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if (self.z) {
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o.z = self.z;
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}
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if (self.name) {
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o.name = self.name;
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}
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Log.log(o);
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}
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Node.prototype.log = function(msg) {
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log_helper(this, Log.INFO, msg);
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};
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Node.prototype.warn = function(msg) {
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log_helper(this, Log.WARN, msg);
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};
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Node.prototype.error = function(logMessage,msg) {
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if (typeof logMessage != 'boolean') {
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logMessage = logMessage || "";
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}
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var handled = false;
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if (msg) {
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handled = this._flow.handleError(this,logMessage,msg);
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}
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if (!handled) {
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log_helper(this, Log.ERROR, logMessage);
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}
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};
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Node.prototype.debug = function(msg) {
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log_helper(this, Log.DEBUG, msg);
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}
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Node.prototype.trace = function(msg) {
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log_helper(this, Log.TRACE, msg);
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}
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/**
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* If called with no args, returns whether metric collection is enabled
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*/
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Node.prototype.metric = function(eventname, msg, metricValue) {
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if (typeof eventname === "undefined") {
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return Log.metric();
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}
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var metrics = {};
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metrics.level = Log.METRIC;
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metrics.nodeid = this.id;
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metrics.event = "node."+this.type+"."+eventname;
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metrics.msgid = msg._msgid;
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metrics.value = metricValue;
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Log.log(metrics);
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}
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/**
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* status: { fill:"red|green", shape:"dot|ring", text:"blah" }
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*/
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Node.prototype.status = function(status) {
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this._flow.handleStatus(this,status);
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};
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module.exports = Node;
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