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node-red/red/runtime/nodes/flows/Flow.js

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/**
* Copyright 2015, 2016 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.
**/
var when = require("when");
var clone = require("clone");
var typeRegistry = require("../registry");
var Log = require("../../log");
var redUtil = require("../../util");
var flowUtil = require("./util");
function Flow(global,flow) {
if (typeof flow === 'undefined') {
flow = global;
}
var activeNodes = {};
var subflowInstanceNodes = {};
var catchNodeMap = {};
var statusNodeMap = {};
this.start = function(diff) {
var node;
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var newNode;
var id;
catchNodeMap = {};
statusNodeMap = {};
var configNodes = Object.keys(flow.configs);
var configNodeAttempts = {};
while (configNodes.length > 0) {
id = configNodes.shift();
node = flow.configs[id];
if (!activeNodes[id]) {
var readyToCreate = true;
// This node doesn't exist.
// Check it doesn't reference another non-existent config node
for (var prop in node) {
if (node.hasOwnProperty(prop) && prop !== 'id' && prop !== 'wires' && prop !== '_users' && flow.configs[node[prop]]) {
if (!activeNodes[node[prop]]) {
// References a non-existent config node
// Add it to the back of the list to try again later
configNodes.push(id);
configNodeAttempts[id] = (configNodeAttempts[id]||0)+1;
if (configNodeAttempts[id] === 100) {
throw new Error("Circular config node dependency detected: "+id);
}
readyToCreate = false;
break;
}
}
}
if (readyToCreate) {
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newNode = createNode(node.type,node);
if (newNode) {
activeNodes[id] = newNode;
}
}
}
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}
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if (diff && diff.rewired) {
for (var j=0;j<diff.rewired.length;j++) {
var rewireNode = activeNodes[diff.rewired[j]];
if (rewireNode) {
rewireNode.updateWires(flow.nodes[rewireNode.id].wires);
}
}
}
for (id in flow.nodes) {
if (flow.nodes.hasOwnProperty(id)) {
node = flow.nodes[id];
if (!node.subflow) {
if (!activeNodes[id]) {
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newNode = createNode(node.type,node);
if (newNode) {
activeNodes[id] = newNode;
}
}
} else {
if (!subflowInstanceNodes[id]) {
try {
var nodes = createSubflow(flow.subflows[node.subflow]||global.subflows[node.subflow],node,flow.subflows,global.subflows,activeNodes);
subflowInstanceNodes[id] = nodes.map(function(n) { return n.id});
for (var i=0;i<nodes.length;i++) {
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if (nodes[i]) {
activeNodes[nodes[i].id] = nodes[i];
}
}
} catch(err) {
console.log(err.stack)
}
}
}
}
}
for (id in activeNodes) {
if (activeNodes.hasOwnProperty(id)) {
node = activeNodes[id];
if (node.type === "catch") {
catchNodeMap[node.z] = catchNodeMap[node.z] || [];
catchNodeMap[node.z].push(node);
} else if (node.type === "status") {
statusNodeMap[node.z] = statusNodeMap[node.z] || [];
statusNodeMap[node.z].push(node);
}
}
}
}
this.stop = function(stopList) {
return when.promise(function(resolve) {
var i;
if (stopList) {
for (i=0;i<stopList.length;i++) {
if (subflowInstanceNodes[stopList[i]]) {
// The first in the list is the instance node we already
// know about
stopList = stopList.concat(subflowInstanceNodes[stopList[i]].slice(1))
}
}
} else {
stopList = Object.keys(activeNodes);
}
var promises = [];
for (i=0;i<stopList.length;i++) {
var node = activeNodes[stopList[i]];
if (node) {
delete activeNodes[stopList[i]];
if (subflowInstanceNodes[stopList[i]]) {
delete subflowInstanceNodes[stopList[i]];
}
try {
var p = node.close();
if (p) {
promises.push(p);
}
} catch(err) {
node.error(err);
}
}
}
when.settle(promises).then(function() {
resolve();
});
});
}
this.update = function(_global,_flow) {
global = _global;
flow = _flow;
}
this.getNode = function(id) {
return activeNodes[id];
}
this.getActiveNodes = function() {
return activeNodes;
}
this.handleStatus = function(node,statusMessage) {
var targetStatusNodes = null;
var reportingNode = node;
var handled = false;
while (reportingNode && !handled) {
targetStatusNodes = statusNodeMap[reportingNode.z];
if (targetStatusNodes) {
targetStatusNodes.forEach(function(targetStatusNode) {
if (targetStatusNode.scope && targetStatusNode.scope.indexOf(node.id) === -1) {
return;
}
var message = {
status: {
text: "",
source: {
id: node.id,
type: node.type,
name: node.name
}
}
};
if (statusMessage.hasOwnProperty("text")) {
message.status.text = statusMessage.text.toString();
}
targetStatusNode.receive(message);
handled = true;
});
}
if (!handled) {
reportingNode = activeNodes[reportingNode.z];
}
}
}
this.handleError = function(node,logMessage,msg) {
var count = 1;
if (msg && msg.hasOwnProperty("error")) {
if (msg.error.hasOwnProperty("source")) {
if (msg.error.source.id === node.id) {
count = msg.error.source.count+1;
if (count === 10) {
node.warn(Log._("nodes.flow.error-loop"));
return;
}
}
}
}
var targetCatchNodes = null;
var throwingNode = node;
var handled = false;
while (throwingNode && !handled) {
targetCatchNodes = catchNodeMap[throwingNode.z];
if (targetCatchNodes) {
targetCatchNodes.forEach(function(targetCatchNode) {
if (targetCatchNode.scope && targetCatchNode.scope.indexOf(throwingNode.id) === -1) {
return;
}
var errorMessage;
if (msg) {
errorMessage = redUtil.cloneMessage(msg);
} else {
errorMessage = {};
}
if (errorMessage.hasOwnProperty("error")) {
errorMessage._error = errorMessage.error;
}
errorMessage.error = {
message: logMessage.toString(),
source: {
id: node.id,
type: node.type,
name: node.name,
count: count
}
};
if (logMessage.hasOwnProperty('stack')) {
errorMessage.error.stack = logMessage.stack;
}
targetCatchNode.receive(errorMessage);
handled = true;
});
}
if (!handled) {
throwingNode = activeNodes[throwingNode.z];
}
}
}
}
function createNode(type,config) {
var nn = null;
var nt = typeRegistry.get(type);
if (nt) {
var conf = clone(config);
delete conf.credentials;
for (var p in conf) {
if (conf.hasOwnProperty(p)) {
flowUtil.mapEnvVarProperties(conf,p);
}
}
try {
nn = new nt(conf);
}
catch (err) {
Log.log({
level: Log.ERROR,
id:conf.id,
type: type,
msg: err
});
}
} else {
Log.error(Log._("nodes.flow.unknown-type", {type:type}));
}
return nn;
}
function createSubflow(sf,sfn,subflows,globalSubflows,activeNodes) {
//console.log("CREATE SUBFLOW",sf.id,sfn.id);
var nodes = [];
var node_map = {};
var newNodes = [];
var node;
var wires;
var i,j,k;
var createNodeInSubflow = function(def) {
node = clone(def);
var nid = redUtil.generateId();
node_map[node.id] = node;
node._alias = node.id;
node.id = nid;
node.z = sfn.id;
newNodes.push(node);
}
// Clone all of the subflow node definitions and give them new IDs
for (i in sf.configs) {
if (sf.configs.hasOwnProperty(i)) {
createNodeInSubflow(sf.configs[i]);
}
}
// Clone all of the subflow node definitions and give them new IDs
for (i in sf.nodes) {
if (sf.nodes.hasOwnProperty(i)) {
createNodeInSubflow(sf.nodes[i]);
}
}
// Look for any catch/status nodes and update their scope ids
// Update all subflow interior wiring to reflect new node IDs
for (i=0;i<newNodes.length;i++) {
node = newNodes[i];
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] = node_map[outputs[j][k]].id
}
}
if ((node.type === 'catch' || node.type === 'status') && node.scope) {
node.scope = node.scope.map(function(id) {
return node_map[id]?node_map[id].id:""
})
} else {
for (var prop in node) {
if (node.hasOwnProperty(prop) && prop !== '_alias') {
if (node_map[node[prop]]) {
//console.log("Mapped",node.type,node.id,prop,node_map[node[prop]].id);
node[prop] = node_map[node[prop]].id;
}
}
}
}
}
}
// Create a subflow node to accept inbound messages and route appropriately
var Node = require("../Node");
var subflowInstance = {
id: sfn.id,
type: sfn.type,
z: sfn.z,
name: sfn.name,
wires: []
}
if (sf.in) {
subflowInstance.wires = sf.in.map(function(n) { return n.wires.map(function(w) { return node_map[w.id].id;})})
subflowInstance._originalWires = clone(subflowInstance.wires);
}
var subflowNode = new Node(subflowInstance);
subflowNode.on("input", function(msg) { this.send(msg);});
subflowNode._updateWires = subflowNode.updateWires;
subflowNode.updateWires = function(newWires) {
// Wire the subflow outputs
if (sf.out) {
var node,wires,i,j;
// Restore the original wiring to the internal nodes
subflowInstance.wires = clone(subflowInstance._originalWires);
for (i=0;i<sf.out.length;i++) {
wires = sf.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id != sf.id) {
node = node_map[wires[j].id];
if (node._originalWires) {
node.wires = clone(node._originalWires);
}
}
}
}
var modifiedNodes = {};
var subflowInstanceModified = false;
for (i=0;i<sf.out.length;i++) {
wires = sf.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id === sf.id) {
subflowInstance.wires[wires[j].port] = subflowInstance.wires[wires[j].port].concat(newWires[i]);
subflowInstanceModified = true;
} else {
node = 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];
subflowNode.instanceNodes[id].updateWires(node.wires);
});
if (subflowInstanceModified) {
subflowNode._updateWires(subflowInstance.wires);
}
}
}
nodes.push(subflowNode);
// Wire the subflow outputs
if (sf.out) {
var modifiedNodes = {};
for (i=0;i<sf.out.length;i++) {
wires = sf.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id === sf.id) {
// A subflow input wired straight to a subflow output
subflowInstance.wires[wires[j].port] = subflowInstance.wires[wires[j].port].concat(sfn.wires[i])
subflowNode._updateWires(subflowInstance.wires);
} else {
node = node_map[wires[j].id];
modifiedNodes[node.id] = node;
if (!node._originalWires) {
node._originalWires = clone(node.wires);
}
node.wires[wires[j].port] = (node.wires[wires[j].port]||[]).concat(sfn.wires[i]);
}
}
}
}
// Instantiate the nodes
for (i=0;i<newNodes.length;i++) {
node = newNodes[i];
var type = node.type;
var m = /^subflow:(.+)$/.exec(type);
if (!m) {
var newNode = createNode(type,node);
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if (newNode) {
activeNodes[node.id] = newNode;
nodes.push(newNode);
}
} else {
var subflowId = m[1];
nodes = nodes.concat(createSubflow(subflows[subflowId]||globalSubflows[subflowId],node,subflows,globalSubflows,activeNodes));
}
}
subflowNode.instanceNodes = {};
nodes.forEach(function(node) {
subflowNode.instanceNodes[node.id] = node;
});
return nodes;
}
module.exports = {
create: function(global,conf) {
return new Flow(global,conf);
}
}