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

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* 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.
**/
const clone = require("clone");
const Flow = require('./Flow').Flow;
const util = require("util");
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const redUtil = require("@node-red/util").util;
const flowUtil = require("./util");
var Log;
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/**
* This class represents a subflow - which is handled as a special type of Flow
*/
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class Subflow extends Flow {
/**
* Create a Subflow object.
* This takes a subflow definition and instance node, creates a clone of the
* definition with unique ids applied and passes to the super class.
* @param {[type]} parent [description]
* @param {[type]} globalFlow [description]
* @param {[type]} subflowDef [description]
* @param {[type]} subflowInstance [description]
*/
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constructor(parent,globalFlow,subflowDef,subflowInstance) {
// console.log("CREATE SUBFLOW",subflowDef.id,subflowInstance.id);
// console.log("SubflowInstance\n"+JSON.stringify(subflowInstance," ",2));
// console.log("SubflowDef\n"+JSON.stringify(subflowDef," ",2));
var subflows = parent.flow.subflows;
var globalSubflows = parent.global.subflows;
var node_map = {};
var node;
var wires;
var i;
var subflowInternalFlowConfig = {
id: subflowInstance.id,
configs: {},
nodes: {},
subflows: {}
}
if (subflowDef.configs) {
// Clone all of the subflow config node definitions and give them new IDs
for (i in subflowDef.configs) {
if (subflowDef.configs.hasOwnProperty(i)) {
node = createNodeInSubflow(subflowInstance.id,subflowDef.configs[i]);
node_map[node._alias] = node;
subflowInternalFlowConfig.configs[node.id] = node;
}
}
}
if (subflowDef.nodes) {
// Clone all of the subflow node definitions and give them new IDs
for (i in subflowDef.nodes) {
if (subflowDef.nodes.hasOwnProperty(i)) {
node = createNodeInSubflow(subflowInstance.id,subflowDef.nodes[i]);
node_map[node._alias] = node;
subflowInternalFlowConfig.nodes[node.id] = node;
}
}
}
subflowInternalFlowConfig.subflows = clone(subflowDef.subflows || {});
remapSubflowNodes(subflowInternalFlowConfig.configs,node_map);
remapSubflowNodes(subflowInternalFlowConfig.nodes,node_map);
// console.log("Instance config\n",JSON.stringify(subflowInternalFlowConfig,"",2));
super(parent,globalFlow,subflowInternalFlowConfig);
this.TYPE = 'subflow';
this.subflowDef = subflowDef;
this.subflowInstance = subflowInstance;
this.node_map = node_map;
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var env = [];
if (this.subflowDef.env) {
this.subflowDef.env.forEach(e => { env[e.name] = e; });
}
if (this.subflowInstance.env) {
this.subflowInstance.env.forEach(e => { env[e.name] = e; });
}
this.env = env;
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}
/**
* Start the subflow.
* This creates a subflow instance node to handle the inbound messages. It also
* rewires an subflow internal node that is connected to an output so it is connected
* to the parent flow nodes the subflow instance is wired to.
* @param {[type]} diff [description]
* @return {[type]} [description]
*/
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start(diff) {
var self = this;
// Create a subflow node to accept inbound messages and route appropriately
var Node = require("../Node");
if (this.subflowDef.status) {
var subflowStatusConfig = {
id: this.subflowInstance.id+":status",
type: "subflow-status",
z: this.subflowInstance.id,
_flow: this.parent
}
this.statusNode = new Node(subflowStatusConfig);
this.statusNode.on("input", function(msg) {
if (msg.payload !== undefined) {
if (typeof msg.payload === "string") {
// if msg.payload is a String, use it as status text
self.node.status({text:msg.payload})
return;
} else if (Object.prototype.toString.call(msg.payload) === "[object Object]") {
if (msg.payload.hasOwnProperty('text') || msg.payload.hasOwnProperty('fill') || msg.payload.hasOwnProperty('shape') || Object.keys(msg.payload).length === 0) {
// msg.payload is an object that looks like a status object
self.node.status(msg.payload);
return;
}
}
// Anything else - inspect it and use as status text
var text = util.inspect(msg.payload);
if (text.length > 32) { text = text.substr(0,32) + "..."; }
self.node.status({text:text});
} else if (msg.status !== undefined) {
// if msg.status exists
self.node.status(msg.status)
}
})
}
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var subflowInstanceConfig = {
id: this.subflowInstance.id,
type: this.subflowInstance.type,
z: this.subflowInstance.z,
name: this.subflowInstance.name,
wires: [],
_flow: this
}
if (this.subflowDef.in) {
subflowInstanceConfig.wires = this.subflowDef.in.map(function(n) { return n.wires.map(function(w) { return self.node_map[w.id].id;})})
subflowInstanceConfig._originalWires = clone(subflowInstanceConfig.wires);
}
this.node = new Node(subflowInstanceConfig);
this.node.on("input", function(msg) { this.send(msg);});
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this.node.on("close", function() { this.status({}); })
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this.node._updateWires = this.node.updateWires;
this.node.updateWires = function(newWires) {
// Wire the subflow outputs
if (self.subflowDef.out) {
var node,wires,i,j;
// Restore the original wiring to the internal nodes
subflowInstanceConfig.wires = clone(subflowInstanceConfig._originalWires);
for (i=0;i<self.subflowDef.out.length;i++) {
wires = self.subflowDef.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id != self.subflowDef.id) {
node = self.node_map[wires[j].id];
if (node._originalWires) {
node.wires = clone(node._originalWires);
}
}
}
}
var modifiedNodes = {};
var subflowInstanceModified = false;
for (i=0;i<self.subflowDef.out.length;i++) {
wires = self.subflowDef.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id === self.subflowDef.id) {
subflowInstanceConfig.wires[wires[j].port] = subflowInstanceConfig.wires[wires[j].port].concat(newWires[i]);
subflowInstanceModified = true;
} else {
node = self.node_map[wires[j].id];
node.wires[wires[j].port] = node.wires[wires[j].port].concat(newWires[i]);
modifiedNodes[node.id] = node;
}
}
}
Object.keys(modifiedNodes).forEach(function(id) {
var node = modifiedNodes[id];
self.activeNodes[id].updateWires(node.wires);
});
if (subflowInstanceModified) {
self.node._updateWires(subflowInstanceConfig.wires);
}
}
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};
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// Wire the subflow outputs
if (this.subflowDef.out) {
for (var i=0;i<this.subflowDef.out.length;i++) {
// i: the output index
// This is what this Output is wired to
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var wires = this.subflowDef.out[i].wires;
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for (var j=0;j<wires.length;j++) {
if (wires[j].id === this.subflowDef.id) {
// A subflow input wired straight to a subflow output
subflowInstanceConfig.wires[wires[j].port] = subflowInstanceConfig.wires[wires[j].port].concat(this.subflowInstance.wires[i])
this.node._updateWires(subflowInstanceConfig.wires);
} else {
var node = self.node_map[wires[j].id];
if (!node._originalWires) {
node._originalWires = clone(node.wires);
}
node.wires[wires[j].port] = (node.wires[wires[j].port]||[]).concat(this.subflowInstance.wires[i]);
}
}
}
}
if (this.subflowDef.status) {
var subflowStatusId = this.statusNode.id;
wires = this.subflowDef.status.wires;
for (var j=0;j<wires.length;j++) {
if (wires[j].id === this.subflowDef.id) {
// A subflow input wired straight to a subflow output
subflowInstanceConfig.wires[wires[j].port].push(subflowStatusId);
this.node._updateWires(subflowInstanceConfig.wires);
} else {
var node = self.node_map[wires[j].id];
if (!node._originalWires) {
node._originalWires = clone(node.wires);
}
node.wires[wires[j].port] = (node.wires[wires[j].port]||[]);
node.wires[wires[j].port].push(subflowStatusId);
}
}
}
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super.start(diff);
}
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/**
* Get environment variable of subflow
* @param {String} name name of env var
* @return {Object} val value of env var
*/
getSetting(name) {
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var env = this.env;
if (env && env.hasOwnProperty(name)) {
var val = env[name];
try {
var ret = redUtil.evaluateNodeProperty(val.value, val.type, this.node, null, null);
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return ret;
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}
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catch (e) {
this.error(e);
return undefined;
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}
}
var parent = this.parent;
if (parent) {
var val = parent.getSetting(name);
return val;
}
return undefined;
}
/**
* Get a node instance from this subflow.
* If the subflow has a status node, check for that, otherwise use
* the super-class function
* @param {String} id [description]
* @param {Boolean} cancelBubble if true, prevents the flow from passing the request to the parent
* This stops infinite loops when the parent asked this Flow for the
* node to begin with.
* @return {[type]} [description]
*/
getNode(id, cancelBubble) {
if (this.statusNode && this.statusNode.id === id) {
return this.statusNode;
}
return super.getNode(id,cancelBubble);
}
/**
* Handle a status event from a node within this flow.
* @param {Node} node The original node that triggered the event
* @param {Object} statusMessage The status object
* @param {Node} reportingNode The node emitting the status event.
* This could be a subflow instance node when the status
* is being delegated up.
* @param {boolean} muteStatus Whether to emit the status event
* @return {[type]} [description]
*/
handleStatus(node,statusMessage,reportingNode,muteStatus) {
let handled = super.handleStatus(node,statusMessage,reportingNode,muteStatus);
if (!handled) {
if (!this.statusNode || node === this.node) {
// No status node on this subflow caught the status message.
// AND there is no Subflow Status node - so the user isn't
// wanting to manage status messages themselves
// Pass up to the parent with this subflow's instance as the
// reporting node
handled = this.parent.handleStatus(node,statusMessage,this.node,true);
}
}
return handled;
}
/**
* Handle an error event from a node within this flow. If there are no Catch
* nodes within this flow, pass the event to the parent flow.
* @param {[type]} node [description]
* @param {[type]} logMessage [description]
* @param {[type]} msg [description]
* @param {[type]} reportingNode [description]
* @return {[type]} [description]
*/
handleError(node,logMessage,msg,reportingNode) {
let handled = super.handleError(node,logMessage,msg,reportingNode);
if (!handled) {
// No catch node on this subflow caught the error message.
// Pass up to the parent with the subflow's instance as the
// reporting node.
handled = this.parent.handleError(node,logMessage,msg,this.node);
}
return handled;
}
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}
/**
* Clone a node definition for use within a subflow instance.
* Give the node a new id and set its _alias property to record
* its association with the original node definition.
* @param {[type]} subflowInstanceId [description]
* @param {[type]} def [description]
* @return {[type]} [description]
*/
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function createNodeInSubflow(subflowInstanceId, def) {
let node = clone(def);
let nid = redUtil.generateId();
// console.log("Create Node In subflow",node.id, "--->",nid, "(",node.type,")")
// node_map[node.id] = node;
node._alias = node.id;
node.id = nid;
node.z = subflowInstanceId;
return node;
}
/**
* Given an object of {id:nodes} and a map of {old-id:node}, modifiy all
* properties in the nodes object to reference the new node ids.
* This handles:
* - node.wires,
* - node.scope of Catch and Status nodes,
* - node.XYZ for any property where XYZ is recognised as an old property
* @param {[type]} nodes [description]
* @param {[type]} nodeMap [description]
* @return {[type]} [description]
*/
function remapSubflowNodes(nodes,nodeMap) {
for (var id in nodes) {
if (nodes.hasOwnProperty(id)) {
var node = nodes[id];
if (node.wires) {
var outputs = node.wires;
for (j=0;j<outputs.length;j++) {
wires = outputs[j];
for (k=0;k<wires.length;k++) {
outputs[j][k] = nodeMap[outputs[j][k]].id
}
}
}
if ((node.type === 'catch' || node.type === 'status') && node.scope) {
node.scope = node.scope.map(function(id) {
return nodeMap[id]?nodeMap[id].id:""
})
} else {
for (var prop in node) {
if (node.hasOwnProperty(prop) && prop !== '_alias') {
if (nodeMap[node[prop]]) {
//console.log("Mapped",node.type,node.id,prop,nodeMap[node[prop]].id);
node[prop] = nodeMap[node[prop]].id;
}
}
}
}
}
}
}
function createSubflow(parent,globalFlow,subflowDef,subflowInstance) {
return new Subflow(parent,globalFlow,subflowDef,subflowInstance)
}
module.exports = {
init: function(runtime) {
Log = runtime.log;
},
create: createSubflow
}