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node-red/red/nodes/flows/index.js

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/**
* Copyright 2014, 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 clone = require("clone");
var when = require("when");
var Flow = require('./Flow');
var typeRegistry = require("../registry");
var credentials = require("../credentials");
var flowUtil = require("./util");
var log = require("../../log");
var events = require("../../events");
var redUtil = require("../../util");
var deprecated = require("../registry/deprecated");
var storage = null;
var settings = null;
var activeConfig = null;
var activeFlowConfig = null;
var activeFlows = {};
var started = false;
var activeNodesToFlow = {};
var subflowInstanceNodeMap = {};
var typeEventRegistered = false;
function init(_settings, _storage) {
if (started) {
throw new Error("Cannot init without a stop");
}
settings = _settings;
storage = _storage;
started = false;
if (!typeEventRegistered) {
events.on('type-registered',function(type) {
if (activeFlowConfig && activeFlowConfig.missingTypes.length > 0) {
var i = activeFlowConfig.missingTypes.indexOf(type);
if (i != -1) {
log.info(log._("nodes.flows.registered-missing", {type:type}));
activeFlowConfig.missingTypes.splice(i,1);
if (activeFlowConfig.missingTypes.length === 0 && started) {
start();
}
}
}
});
typeEventRegistered = true;
}
}
function load() {
return storage.getFlows().then(function(flows) {
return credentials.load().then(function() {
return setConfig(flows,"load");
});
}).otherwise(function(err) {
log.warn(log._("nodes.flows.error",{message:err.toString()}));
console.log(err.stack);
});
}
function setConfig(_config,type) {
var config = clone(_config);
type = type||"full";
var credentialsChanged = false;
var credentialSavePromise = null;
var configSavePromise = null;
var diff;
var newFlowConfig = flowUtil.parseConfig(clone(config));
if (type !== 'full' && type !== 'load') {
diff = flowUtil.diffConfigs(activeFlowConfig,newFlowConfig);
}
config.forEach(function(node) {
if (node.credentials) {
credentials.extract(node);
credentialsChanged = true;
}
});
if (credentialsChanged) {
credentialSavePromise = credentials.save();
} else {
credentialSavePromise = when.resolve();
}
if (type === 'load') {
configSavePromise = credentialSavePromise;
type = 'full';
} else {
configSavePromise = credentialSavePromise.then(function() {
return storage.saveFlows(config);
});
}
return configSavePromise
.then(function() {
activeConfig = config;
activeFlowConfig = newFlowConfig;
return credentials.clean(activeConfig).then(function() {
if (started) {
return stop(type,diff).then(function() {
start(type,diff);
}).otherwise(function(err) {
})
}
});
});
}
function getNode(id) {
var node;
if (activeNodesToFlow[id]) {
return activeFlows[activeNodesToFlow[id]].getNode(id);
}
for (var flowId in activeFlows) {
if (activeFlows.hasOwnProperty(flowId)) {
node = activeFlows[flowId].getNode(id);
if (node) {
return node;
}
}
}
return null;
}
function eachNode(cb) {
for (var id in activeFlowConfig.allNodes) {
if (activeFlowConfig.allNodes.hasOwnProperty(id)) {
cb(activeFlowConfig.allNodes[id]);
}
}
}
function getConfig() {
return activeConfig;
}
function delegateError(node,logMessage,msg) {
if (activeFlows[node.z]) {
activeFlows[node.z].handleError(node,logMessage,msg);
} else if (activeNodesToFlow[node.z]) {
activeFlows[activeNodesToFlow[node.z]].handleError(node,logMessage,msg);
} else if (activeFlowConfig.subflows[node.z]) {
subflowInstanceNodeMap[node.id].forEach(function(n) {
delegateError(getNode(n),logMessage,msg);
});
}
}
function handleError(node,logMessage,msg) {
if (node.z) {
delegateError(node,logMessage,msg);
} else {
if (activeFlowConfig.configs[node.id]) {
activeFlowConfig.configs[node.id]._users.forEach(function(id) {
var userNode = activeFlowConfig.allNodes[id];
delegateError(userNode,logMessage,msg);
})
}
}
}
function delegateStatus(node,statusMessage) {
if (activeFlows[node.z]) {
activeFlows[node.z].handleStatus(node,statusMessage);
}
}
function handleStatus(node,statusMessage) {
if (node.z) {
delegateStatus(node,statusMessage);
} else {
if (activeFlowConfig.configs[node.id]) {
activeFlowConfig.configs[node.id]._users.forEach(function(id) {
var userNode = activeFlowConfig.allNodes[id];
delegateStatus(userNode,statusMessage);
})
}
}
}
function start(type,diff) {
type = type||"full";
started = true;
var i;
if (activeFlowConfig.missingTypes.length > 0) {
log.info(log._("nodes.flows.missing-types"));
var knownUnknowns = 0;
for (i=0;i<activeFlowConfig.missingTypes.length;i++) {
var nodeType = activeFlowConfig.missingTypes[i];
var info = deprecated.get(nodeType);
if (info) {
log.info(log._("nodes.flows.missing-type-provided",{type:activeFlowConfig.missingTypes[i],module:info.module}));
knownUnknowns += 1;
} else {
log.info(" - "+activeFlowConfig.missingTypes[i]);
}
}
if (knownUnknowns > 0) {
log.info(log._("nodes.flows.missing-type-install-1"));
log.info(" npm install <module name>");
log.info(log._("nodes.flows.missing-type-install-2"));
log.info(" "+settings.userDir);
}
return;
}
if (diff) {
log.info(log._("nodes.flows.starting-modified-"+type));
} else {
log.info(log._("nodes.flows.starting-flows"));
}
var id;
if (!diff) {
activeFlows['_GLOBAL_'] = Flow.create(activeFlowConfig);
for (id in activeFlowConfig.flows) {
if (activeFlowConfig.flows.hasOwnProperty(id)) {
activeFlows[id] = Flow.create(activeFlowConfig,activeFlowConfig.flows[id]);
}
}
} else {
activeFlows['_GLOBAL_'].update(activeFlowConfig,activeFlowConfig);
for (id in activeFlowConfig.flows) {
if (activeFlowConfig.flows.hasOwnProperty(id)) {
if (activeFlows[id]) {
activeFlows[id].update(activeFlowConfig,activeFlowConfig.flows[id]);
} else {
activeFlows[id] = Flow.create(activeFlowConfig,activeFlowConfig.flows[id]);
}
}
}
}
for (id in activeFlows) {
if (activeFlows.hasOwnProperty(id)) {
activeFlows[id].start(diff);
var activeNodes = activeFlows[id].getActiveNodes();
Object.keys(activeNodes).forEach(function(nid) {
activeNodesToFlow[nid] = id;
if (activeNodes[nid]._alias) {
subflowInstanceNodeMap[activeNodes[nid]._alias] = subflowInstanceNodeMap[activeNodes[nid]._alias] || [];
subflowInstanceNodeMap[activeNodes[nid]._alias].push(nid);
}
});
}
}
events.emit("nodes-started");
if (diff) {
log.info(log._("nodes.flows.started-modified-"+type));
} else {
log.info(log._("nodes.flows.started-flows"));
}
}
function stop(type,diff) {
type = type||"full";
if (diff) {
log.info(log._("nodes.flows.stopping-modified-"+type));
} else {
log.info(log._("nodes.flows.stopping-flows"));
}
started = false;
var promises = [];
var stopList;
if (type === 'nodes') {
stopList = diff.changed.concat(diff.removed);
} else if (type === 'flows') {
stopList = diff.changed.concat(diff.removed).concat(diff.linked);
}
for (var id in activeFlows) {
if (activeFlows.hasOwnProperty(id)) {
promises = promises.concat(activeFlows[id].stop(stopList));
if (!diff || diff.removed[id]) {
delete activeFlows[id];
}
}
}
return when.promise(function(resolve,reject) {
when.settle(promises).then(function() {
for (id in activeNodesToFlow) {
if (activeNodesToFlow.hasOwnProperty(id)) {
if (!activeFlows[activeNodesToFlow[id]]) {
delete activeNodesToFlow[id];
}
}
}
if (stopList) {
stopList.forEach(function(id) {
delete activeNodesToFlow[id];
});
}
// Ideally we'd prune just what got stopped - but mapping stopList
// id to the list of subflow instance nodes is something only Flow
// can do... so cheat by wiping the map knowing it'll be rebuilt
// in start()
subflowInstanceNodeMap = {};
if (diff) {
log.info(log._("nodes.flows.stopped-modified-"+type));
} else {
log.info(log._("nodes.flows.stopped-flows"));
}
resolve();
});
});
}
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function checkTypeInUse(id) {
var nodeInfo = typeRegistry.getNodeInfo(id);
if (!nodeInfo) {
throw new Error(log._("nodes.index.unrecognised-id", {id:id}));
} else {
var inUse = {};
var config = getConfig();
config.forEach(function(n) {
inUse[n.type] = (inUse[n.type]||0)+1;
});
var nodesInUse = [];
nodeInfo.types.forEach(function(t) {
if (inUse[t]) {
nodesInUse.push(t);
}
});
if (nodesInUse.length > 0) {
var msg = nodesInUse.join(", ");
var err = new Error(log._("nodes.index.type-in-use", {msg:msg}));
err.code = "type_in_use";
throw err;
}
}
}
module.exports = {
init: init,
/**
* Load the current flow configuration from storage
* @return a promise for the loading of the config
*/
load: load,
get:getNode,
eachNode: eachNode,
/**
* Gets the current flow configuration
*/
getFlows: getConfig,
/**
* Sets the current active config.
* @param config the configuration to enable
* @param type the type of deployment to do: full (default), nodes, flows, load
* @return a promise for the saving/starting of the new flow
*/
setFlows: setConfig,
/**
* Starts the current flow configuration
*/
startFlows: start,
/**
* Stops the current flow configuration
* @return a promise for the stopping of the flow
*/
stopFlows: stop,
handleError: handleError,
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handleStatus: handleStatus,
checkTypeInUse: checkTypeInUse
};