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node-red/red/nodes/Flow.js

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/**
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* Copyright 2015 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 credentials = require("./credentials");
var redUtil = require("../util");
var events = require("../events");
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var log = require("../log");
function getID() {
return (1+Math.random()*4294967295).toString(16);
}
function createNode(type,config) {
var nn = null;
var nt = typeRegistry.get(type);
if (nt) {
try {
nn = new nt(clone(config));
}
catch (err) {
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log.warn(type+" : "+err);
}
} else {
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log.warn("unknown type: "+type);
}
return nn;
}
function createSubflow(sf,sfn,subflows) {
//console.log("CREATE SUBFLOW",sf.config.id,sfn.id);
var nodes = [];
var node_map = {};
var newNodes = [];
var node;
var wires;
var i,j,k;
// Clone all of the subflow node definitions and give them new IDs
for (i=0;i<sf.nodes.length;i++) {
node = clone(sf.nodes[i].config);
var nid = getID();
node_map[node.id] = node;
node._alias = node.id;
node.id = nid;
newNodes.push(node);
}
// Update all subflow interior wiring to reflect new node IDs
for (i=0;i<newNodes.length;i++) {
node = newNodes[i];
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
}
}
}
// Create a subflow node to accept inbound messages and route appropriately
var Node = require("./Node");
var subflowInstance = {
id: sfn.id,
type: sfn.type,
name: sfn.name,
wires: []
}
if (sf.config.in) {
subflowInstance.wires = sf.config.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.config.out) {
var node,wires,i,j;
// Restore the original wiring to the internal nodes
subflowInstance.wires = clone(subflowInstance._originalWires);
for (i=0;i<sf.config.out.length;i++) {
wires = sf.config.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id != sf.config.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.config.out.length;i++) {
wires = sf.config.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id === sf.config.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;
}
}
}
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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.config.out) {
var modifiedNodes = {};
for (i=0;i<sf.config.out.length;i++) {
wires = sf.config.out[i].wires;
for (j=0;j<wires.length;j++) {
if (wires[j].id === sf.config.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:(.+)$/.exec(type);
if (!m) {
nodes.push(createNode(type,node));
} else {
var subflowId = m[1];
nodes = nodes.concat(createSubflow(subflows[subflowId],node,subflows));
}
}
subflowNode.instanceNodes = {};
nodes.forEach(function(node) {
subflowNode.instanceNodes[node.id] = node;
});
return nodes;
}
function diffNodeConfigs(oldNode,newNode) {
if (oldNode == null) {
return true;
} else {
for (var p in newNode) {
if (newNode.hasOwnProperty(p) && p != "x" && p != "y" && p != "wires") {
if (!redUtil.compareObjects(oldNode[p],newNode[p])) {
return true;
}
}
}
}
return false;
}
var subflowInstanceRE = /^subflow:(.+)$/;
function Flow(config) {
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this.activeNodes = {};
this.subflowInstanceNodes = {};
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this.started = false;
this.parseConfig(config);
}
Flow.prototype.parseConfig = function(config) {
var i;
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var nodeConfig;
var nodeType;
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this.config = config;
this.allNodes = {};
this.nodes = {};
this.subflows = {};
var unknownTypes = {};
for (i=0;i<this.config.length;i++) {
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nodeConfig = this.config[i];
nodeType = nodeConfig.type;
if (nodeType == "subflow") {
this.subflows[nodeConfig.id] = {
type: "subflow",
config: nodeConfig,
nodes: []
}
}
}
//console.log("Known subflows:",Object.keys(this.subflows));
for (i=0;i<this.config.length;i++) {
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nodeConfig = this.config[i];
this.allNodes[nodeConfig.id] = nodeConfig;
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nodeType = nodeConfig.type;
if (nodeConfig.credentials) {
delete nodeConfig.credentials;
}
if (nodeType != "tab" && nodeType != "subflow") {
var m = subflowInstanceRE.exec(nodeType);
if ((m && !this.subflows[m[1]]) || (!m && !typeRegistry.get(nodeType))) {
// This is an unknown subflow or an unknown type
unknownTypes[nodeType] = true;
} else {
var nodeInfo = {
type: nodeType,
config:nodeConfig
}
if (m) {
nodeInfo.subflow = m[1];
}
if (this.subflows[nodeConfig.z]) {
this.subflows[nodeConfig.z].nodes.push(nodeInfo);
} else {
this.nodes[nodeConfig.id] = nodeInfo;
}
}
}
}
//console.log("NODES");
//for (i in this.nodes) {
// if (this.nodes.hasOwnProperty(i)) {
// console.log(" ",i,this.nodes[i].type,this.nodes[i].config.name||"");
// }
//}
//console.log("SUBFLOWS");
//for (i in this.subflows) {
// if (this.subflows.hasOwnProperty(i)) {
// console.log(" ",i,this.subflows[i].type,this.subflows[i].config.name||"");
// for (var j=0;j<this.subflows[i].nodes.length;j++) {
// console.log(" ",this.subflows[i].nodes[j].config.id,this.subflows[i].nodes[j].type,this.subflows[i].nodes[j].config.name||"");
// }
// }
//}
this.missingTypes = Object.keys(unknownTypes);
}
Flow.prototype.start = function() {
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this.started = true;
if (this.missingTypes.length > 0) {
throw new Error("missing types");
}
events.emit("nodes-starting");
for (var id in this.nodes) {
if (this.nodes.hasOwnProperty(id)) {
var node = this.nodes[id];
if (!node.subflow) {
if (!this.activeNodes[id]) {
this.activeNodes[id] = createNode(node.type,node.config);
//console.log(id,"created");
} else {
//console.log(id,"already running");
}
} else {
if (!this.subflowInstanceNodes[id]) {
var nodes = createSubflow(this.subflows[node.subflow],node.config,this.subflows);
this.subflowInstanceNodes[id] = nodes.map(function(n) { return n.id});
for (var i=0;i<nodes.length;i++) {
this.activeNodes[nodes[i].id] = nodes[i];
}
//console.log(id,"(sf) created");
} else {
//console.log(id,"(sf) already running");
}
}
}
}
credentials.clean(this.config);
events.emit("nodes-started");
}
Flow.prototype.stop = function(nodeList) {
nodeList = nodeList || Object.keys(this.activeNodes);
var flow = this;
return when.promise(function(resolve) {
events.emit("nodes-stopping");
var promises = [];
for (var i=0;i<nodeList.length;i++) {
var node = flow.activeNodes[nodeList[i]];
if (node) {
try {
var p = node.close();
if (p) {
promises.push(p);
}
} catch(err) {
node.error(err);
}
delete flow.subflowInstanceNodes[nodeList[i]];
delete flow.activeNodes[nodeList[i]];
}
}
when.settle(promises).then(function() {
events.emit("nodes-stopped");
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flow.started = false;
resolve();
});
});
}
Flow.prototype.getMissingTypes = function() {
return this.missingTypes;
}
Flow.prototype.typeRegistered = function(type) {
if (this.missingTypes.length > 0) {
var i = this.missingTypes.indexOf(type);
if (i != -1) {
this.missingTypes.splice(i,1);
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if (this.missingTypes.length === 0 && this.started) {
this.start();
}
}
}
}
Flow.prototype.getNode = function(id) {
return this.activeNodes[id];
}
Flow.prototype.getFlow = function() {
//console.log(this.config);
return this.config;
}
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Flow.prototype.eachNode = function(callback) {
for (var id in this.activeNodes) {
if (this.activeNodes.hasOwnProperty(id)) {
callback(this.activeNodes[id]);
}
}
}
Flow.prototype.applyConfig = function(config,type) {
var activeNodesToStop = [];
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var nodesToRewire = [];
if (type && type!="full") {
var diff = this.diffFlow(config);
//console.log(diff);
//var diff = {
// deleted:[]
// changed:[]
// linked:[]
// wiringChanged: []
//}
var nodesToStop = [];
var nodesToCreate = [];
nodesToRewire = diff.wiringChanged;
if (type == "nodes") {
nodesToStop = diff.deleted.concat(diff.changed);
nodesToCreate = diff.changed;
} else if (type == "flows") {
nodesToStop = diff.deleted.concat(diff.changed).concat(diff.linked);
nodesToCreate = diff.changed.concat(diff.linked);
}
for (var i=0;i<nodesToStop.length;i++) {
var id = nodesToStop[i];
if (this.subflowInstanceNodes[id]) {
activeNodesToStop = activeNodesToStop.concat(this.subflowInstanceNodes[id]);
} else if (this.activeNodes[id]) {
activeNodesToStop.push(id);
}
}
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} else {
activeNodesToStop = Object.keys(this.activeNodes);
}
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var flow = this;
return this.stop(activeNodesToStop).then(function() {
flow.parseConfig(config);
for (var i=0;i<nodesToRewire.length;i++) {
var node = flow.activeNodes[nodesToRewire[i]];
if (node) {
node.updateWires(flow.allNodes[node.id].wires);
}
}
flow.start();
})
}
Flow.prototype.diffFlow = function(config) {
var flow = this;
var configNodes = {};
var changedNodes = {};
var deletedNodes = {};
var linkChangedNodes = {};
var activeLinks = {};
var newLinks = {};
var changedSubflowStack = [];
var changedSubflows = {};
var buildNodeLinks = function(nodeLinks,n,nodes) {
nodeLinks[n.id] = nodeLinks[n.id] || [];
if (n.wires) {
for (var j=0;j<n.wires.length;j++) {
var wires = n.wires[j];
for (var k=0;k<wires.length;k++) {
nodeLinks[n.id].push(wires[k]);
var nn = nodes[wires[k]];
if (nn) {
nodeLinks[nn.id] = nodeLinks[nn.id] || [];
nodeLinks[nn.id].push(n.id);
}
}
}
}
}
config.forEach(function(node) {
configNodes[node.id] = node;
});
config.forEach(function(node) {
var changed = false;
if (node.credentials) {
changed = true;
delete node.credentials;
} else {
changed = diffNodeConfigs(flow.allNodes[node.id],node);
if (!changed) {
if (configNodes[node.z] && configNodes[node.z].type == "subflow") {
var originalNode = flow.allNodes[node.id];
if (originalNode && !redUtil.compareObjects(originalNode.wires,node.wires)) {
// This is a node in a subflow whose wiring has changed. Mark subflow as changed
changed = true;
}
}
}
}
if (changed) {
changedNodes[node.id] = node;
}
});
this.config.forEach(function(node) {
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if (!configNodes[node.id] && node.type != "tab") {
deletedNodes[node.id] = node;
}
buildNodeLinks(activeLinks,node,flow.allNodes);
});
this.config.forEach(function(node) {
for (var prop in node) {
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if (node.hasOwnProperty(prop) && prop != "z" && prop != "id" && prop != "wires") {
// This node has a property that references a changed node
// Assume it is a config node change and mark this node as
// changed.
if (changedNodes[node[prop]]) {
changedNodes[node.id] = node;
}
}
}
});
var checkSubflowMembership = function(nodes,id) {
var node = nodes[id];
if (node) {
if (node.type == "subflow") {
changedSubflows[id] = node;
changedSubflowStack.push(id);
} else if (nodes[node.z] && nodes[node.z].type == "subflow") {
if (!changedSubflows[node.z]) {
changedSubflows[node.z] = nodes[node.z];
changedSubflowStack.push(node.z);
}
}
}
};
Object.keys(changedNodes).forEach(function(n) { checkSubflowMembership(configNodes,n)});
Object.keys(deletedNodes).forEach(function(n) { checkSubflowMembership(flow.allNodes,n)});
while (changedSubflowStack.length > 0) {
var subflowId = changedSubflowStack.pop();
config.forEach(function(node) {
if (node.type == "subflow:"+subflowId) {
if (!changedNodes[node.id]) {
changedNodes[node.id] = node;
checkSubflowMembership(configNodes,node.id);
}
}
});
}
config.forEach(function(node) {
buildNodeLinks(newLinks,node,configNodes);
});
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var markLinkedNodes = function(linkChanged,otherChangedNodes,linkMap,allNodes) {
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var stack = Object.keys(changedNodes).concat(Object.keys(otherChangedNodes));
var visited = {};
while(stack.length > 0) {
var id = stack.pop();
var linkedNodes = linkMap[id];
if (linkedNodes) {
for (var i=0;i<linkedNodes.length;i++) {
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var linkedNodeId = linkedNodes[i];
if (changedNodes[linkedNodeId] || deletedNodes[linkedNodeId] || otherChangedNodes[linkedNodeId] || linkChanged[linkedNodeId]) {
// Do nothing - this linked node is already marked as changed, so will get done
} else {
linkChanged[linkedNodeId] = true;
stack.push(linkedNodeId);
}
}
}
}
}
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markLinkedNodes(linkChangedNodes,{},newLinks,configNodes);
markLinkedNodes(linkChangedNodes,{},activeLinks,flow.allNodes);
var modifiedLinkNodes = {};
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config.forEach(function(node) {
if (!changedNodes[node.id]) {
// only concerned about unchanged nodes whose wiring may have changed
var newNodeLinks = newLinks[node.id];
var oldNodeLinks = activeLinks[node.id];
var newLinkMap = {};
newNodeLinks.forEach(function(l) { newLinkMap[l] = (newLinkMap[l]||0)+1;});
var oldLinkMap = {};
oldNodeLinks.forEach(function(l) { oldLinkMap[l] = (oldLinkMap[l]||0)+1;});
newNodeLinks.forEach(function(link) {
if (newLinkMap[link] != oldLinkMap[link]) {
modifiedLinkNodes[node.id] = node;
linkChangedNodes[node.id] = node;
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if (!changedNodes[link] && !deletedNodes[link]) {
modifiedLinkNodes[link] = configNodes[link];
linkChangedNodes[link] = configNodes[link];
}
}
});
oldNodeLinks.forEach(function(link) {
if (newLinkMap[link] != oldLinkMap[link]) {
modifiedLinkNodes[node.id] = node;
linkChangedNodes[node.id] = node;
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if (!changedNodes[link] && !deletedNodes[link]) {
modifiedLinkNodes[link] = configNodes[link];
linkChangedNodes[link] = configNodes[link];
}
}
});
}
});
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markLinkedNodes(linkChangedNodes,modifiedLinkNodes,newLinks,configNodes);
//config.forEach(function(n) {
// console.log((changedNodes[n.id]!=null)?"[C]":"[ ]",(linkChangedNodes[n.id]!=null)?"[L]":"[ ]","[ ]",n.id,n.type,n.name);
//});
//Object.keys(deletedNodes).forEach(function(id) {
// var n = flow.allNodes[id];
// console.log("[ ] [ ] [D]",n.id,n.type);
//});
var diff = {
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deleted: Object.keys(deletedNodes).filter(function(id) { return deletedNodes[id].type != "subflow" && (!deletedNodes[id].z || configNodes[deletedNodes[id].z].type != "subflow")}),
changed: Object.keys(changedNodes).filter(function(id) { return changedNodes[id].type != "subflow" && (!changedNodes[id].z || configNodes[changedNodes[id].z].type != "subflow")}),
linked: Object.keys(linkChangedNodes).filter(function(id) { return linkChangedNodes[id].type != "subflow" && (!linkChangedNodes[id].z || configNodes[linkChangedNodes[id].z].type != "subflow")}),
wiringChanged: []
}
config.forEach(function(n) {
if (!configNodes[n.z] || configNodes[n.z].type != "subflow") {
var originalNode = flow.allNodes[n.id];
if (originalNode && !redUtil.compareObjects(originalNode.wires,n.wires)) {
diff.wiringChanged.push(n.id);
}
}
});
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return diff;
}
module.exports = Flow;