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node-red/packages/node_modules/@node-red/runtime/lib/nodes/Node.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* 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 redUtil = require("@node-red/util").util;
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var Log = require("@node-red/util").log;
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var context = require("./context");
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var flows = require("./flows");
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const NOOP_SEND = function() {}
/**
* The Node object is the heart of a Node-RED flow. It is the object that all
* nodes extend.
*
* The Node object itself inherits from EventEmitter, although it provides
* custom implementations of some of the EE functions in order to handle
* `input` and `close` events properly.
*/
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function Node(n) {
this.id = n.id;
this.type = n.type;
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this.z = n.z;
this._closeCallbacks = [];
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this._inputCallback = null;
this._inputCallbacks = null;
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if (n.name) {
this.name = n.name;
}
if (n._alias) {
this._alias = n._alias;
}
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if (n._flow) {
// Make this a non-enumerable property as it may cause
// circular references. Any existing code that tries to JSON serialise
// the object (such as dashboard) will not like circular refs
// The value must still be writable in the case that a node does:
// Object.assign(this,config)
// as part of its constructor - config._flow will overwrite this._flow
// which we can tolerate as they are the same object.
Object.defineProperty(this,'_flow', {value: n._flow, enumerable: false, writable: true })
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this._asyncDelivery = n._flow.asyncMessageDelivery;
}
if (this._asyncDelivery === undefined) {
this._asyncDelivery = true;
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}
this.updateWires(n.wires);
}
util.inherits(Node, EventEmitter);
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/**
* Update the wiring configuration for this node.
*
* We try to optimise the message handling path. To do this there are three
* cases to consider:
* 1. this node is wired to nothing. In this case we replace node.send with a
* NO-OP function.
* 2. this node is wired to one other node. In this case we set `this._wire`
* as a reference to the node it is wired to. This means we avoid unnecessary
* iterations over what would otherwise be a 1-element array.
* 3. this node is wired to multiple things. The normal node.send processing of
* this.wires applies.
*
* @param {array} wires the new wiring configuration
*/
Node.prototype.updateWires = function(wires) {
//console.log("UPDATE",this.id);
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
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this.send = NOOP_SEND
} 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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/**
* Get the context object for this node.
*
* As most nodes do not use context, this is a lazy function that will only
* create a context instance for the node if it is needed.
* @return {object} the context object
*/
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Node.prototype.context = function() {
if (!this._context) {
this._context = context.get(this._alias||this.id,this.z);
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}
return this._context;
}
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/**
* Handle the complete event for a message
*
* @param {object} msg The message that has completed
* @param {error} error (optional) an error hit whilst handling the message
*/
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Node.prototype._complete = function(msg,error) {
if (error) {
// For now, delegate this to this.error
// But at some point, the timeout handling will need to know about
// this as well.
this.error(error,msg);
} else {
this._flow.handleComplete(this,msg);
}
}
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/**
* An internal reference to the original EventEmitter.on() function
*/
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Node.prototype._on = Node.prototype.on;
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/**
* Register a callback function for a named event.
* 'close' and 'input' events are handled locally, other events defer to EventEmitter.on()
*/
Node.prototype.on = function(event, callback) {
var node = this;
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if (event == "close") {
this._closeCallbacks.push(callback);
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} else if (event === "input") {
if (this._inputCallback) {
this._inputCallbacks = [this._inputCallback, callback];
this._inputCallback = null;
} else if (this._inputCallbacks) {
this._inputCallbacks.push(callback);
} else {
this._inputCallback = callback;
}
} else {
this._on(event, callback);
}
};
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/**
* An internal reference to the original EventEmitter.emit() function
*/
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Node.prototype._emit = Node.prototype.emit;
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/**
* Emit an event to all registered listeners.
*/
Node.prototype.emit = function(event, ...args) {
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var node = this;
if (event === "input") {
// When Pluggable Message Routing arrives, this will be called from
// that and will already be sync/async depending on the router.
if (this._asyncDelivery) {
setImmediate(function() {
node._emitInput.apply(node,args);
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});
} else {
this._emitInput.apply(this,args);
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}
} else {
this._emit.apply(this,arguments);
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}
}
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/**
* Handle the 'input' event.
*
* This will call all registered handlers for the 'input' event.
*/
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Node.prototype._emitInput = function(arg) {
var node = this;
this.metric("receive", arg);
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if (node._inputCallback) {
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// Just one callback registered.
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try {
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node._inputCallback(
arg,
function() { node.send.apply(node,arguments) },
function(err) { node._complete(arg,err); }
);
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} catch(err) {
node.error(err,arg);
}
} else if (node._inputCallbacks) {
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// Multiple callbacks registered. Call each one, tracking eventual completion
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var c = node._inputCallbacks.length;
for (var i=0;i<c;i++) {
var cb = node._inputCallbacks[i];
if (cb.length === 2) {
c++;
}
try {
cb.call(
node,
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arg,
function() { node.send.apply(node,arguments) },
function(err) {
c--;
if (c === 0) {
node._complete(arg,err);
}
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}
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);
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} catch(err) {
node.error(err,arg);
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}
}
}
}
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/**
* An internal reference to the original EventEmitter.removeListener() function
*/
Node.prototype._removeListener = Node.prototype.removeListener;
/**
* Remove a listener for an event
*/
Node.prototype.removeListener = function(name, listener) {
var index;
if (name === "input") {
if (this._inputCallback && this._inputCallback === listener) {
// Removing the only callback
this._inputCallback = null;
} else if (this._inputCallbacks) {
// Removing one of many callbacks
index = this._inputCallbacks.indexOf(listener);
if (index > -1) {
this._inputCallbacks.splice(index,1);
}
// Check if we can optimise back to a single callback
if (this._inputCallbacks.length === 1) {
this._inputCallback = this._inputCallbacks[0];
this._inputCallbacks = null;
}
}
} else if (name === "close") {
index = this._closeCallbacks.indexOf(listener);
if (index > -1) {
this._closeCallbacks.splice(index,1);
}
} else {
this._removeListener(name, listener);
}
}
/**
* An internal reference to the original EventEmitter.removeAllListeners() function
*/
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Node.prototype._removeAllListeners = Node.prototype.removeAllListeners;
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/**
* Remove all listeners for an event
*/
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Node.prototype.removeAllListeners = function(name) {
if (name === "input") {
this._inputCallback = null;
this._inputCallbacks = null;
} else if (name === "close") {
this._closeCallbacks = [];
} else {
this._removeAllListeners(name);
}
}
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/**
* Called when the node is being stopped
* @param {boolean} removed Whether the node has been removed, or just being stopped
* @return {Promise} resolves when the node has closed
*/
Node.prototype.close = function(removed) {
//console.log(this.type,this.id,removed);
var promises = [];
var node = this;
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// Call all registered close callbacks.
for (var i=0;i<this._closeCallbacks.length;i++) {
var callback = this._closeCallbacks[i];
if (callback.length > 0) {
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// The callback takes a 'done' callback and (maybe) the removed flag
promises.push(
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new Promise((resolve) => {
try {
var args = [];
if (callback.length === 2) {
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// The listener expects the removed flag
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args.push(!!removed);
}
args.push(() => {
resolve();
});
callback.apply(node, args);
} catch(err) {
// TODO: error thrown in node async close callback
// We've never logged this properly.
resolve();
}
})
);
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} else {
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// No done callback so handle synchronously
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try {
callback.call(node);
} catch(err) {
// TODO: error thrown in node sync close callback
// We've never logged this properly.
}
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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) {
return context.delete(this._alias||this.id,this.z);
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}
});
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} else {
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if (this._context) {
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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/**
* Send a message to the nodes wired.
*
*
* @param {object} msg A message or array of messages to send
*/
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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;
} 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
if (!msg._msgid) {
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);
/* istanbul ignore else */
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 = [];
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var sentMessageId = null;
// 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
/* istanbul ignore else */
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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++) {
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node = this._flow.getNode(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++) {
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var m = msgs[k];
if (m !== null && m !== undefined) {
/* istanbul ignore else */
if (!sentMessageId) {
sentMessageId = m._msgid;
}
if (msgSent) {
var clonedmsg = redUtil.cloneMessage(m);
sendEvents.push({n:node,m:clonedmsg});
} else {
sendEvents.push({n:node,m:m});
msgSent = true;
}
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}
}
}
}
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}
}
}
/* istanbul ignore else */
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if (!sentMessageId) {
sentMessageId = redUtil.generateId();
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}
this.metric("send",{_msgid:sentMessageId});
for (i=0;i<sendEvents.length;i++) {
var ev = sendEvents[i];
/* istanbul ignore else */
if (!ev.m._msgid) {
ev.m._msgid = sentMessageId;
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}
ev.n.receive(ev.m);
}
};
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/**
* Receive a message.
*
* This will emit the `input` event with the provided message.
* As of 1.0, this will return *before* any 'input' callback handler is invoked.
*/
Node.prototype.receive = function(msg) {
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if (!msg) {
msg = {};
}
if (!msg._msgid) {
msg._msgid = redUtil.generateId();
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}
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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
};
if (self._alias) {
o._alias = self._alias;
}
if (self._flow) {
o.path = self._flow.path;
}
if (self.z) {
o.z = self.z;
}
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if (self.name) {
o.name = self.name;
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}
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Log.log(o);
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}
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/**
* Log an INFO level message
*/
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Node.prototype.log = function(msg) {
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log_helper(this, Log.INFO, msg);
};
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/**
* Log a WARN level message
*/
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Node.prototype.warn = function(msg) {
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log_helper(this, Log.WARN, msg);
};
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/**
* Log an ERROR level message
*/
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Node.prototype.error = function(logMessage,msg) {
if (typeof logMessage != 'boolean') {
logMessage = logMessage || "";
}
var handled = false;
if (msg && typeof msg === 'object') {
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handled = this._flow.handleError(this,logMessage,msg);
}
if (!handled) {
log_helper(this, Log.ERROR, logMessage);
}
};
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/**
* Log an DEBUG level message
*/
Node.prototype.debug = function(msg) {
log_helper(this, Log.DEBUG, msg);
}
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/**
* Log an TRACE level message
*/
Node.prototype.trace = function(msg) {
log_helper(this, Log.TRACE, msg);
}
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/**
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* Log a metric event.
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* If called with no args, returns whether metric collection is enabled
*/
Node.prototype.metric = function(eventname, msg, metricValue) {
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if (typeof eventname === "undefined") {
return Log.metric();
}
var metrics = {};
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metrics.level = Log.METRIC;
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metrics.nodeid = this.id;
metrics.event = "node."+this.type+"."+eventname;
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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* Set the node's status object
*
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* status: { fill:"red|green", shape:"dot|ring", text:"blah" }
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* or
* status: "simple text status"
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*/
Node.prototype.status = function(status) {
switch (typeof status) {
case "string":
case "number":
case "boolean":
status = {text:""+status}
}
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this._flow.handleStatus(this,status);
};
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module.exports = Node;