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node-red/red/nodes/flows.js

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/**
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* Copyright 2014, 2015 IBM Corp.
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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 clone = require("clone");
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var when = require("when");
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var typeRegistry = require("./registry");
var credentials = require("./credentials");
var Flow = require("./Flow");
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var log = require("../log");
var events = require("../events");
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var redUtil = require("../util");
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var storage = null;
var activeFlow = null;
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var nodes = {};
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var subflows = {};
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var activeConfig = [];
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var activeConfigNodes = {};
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events.on('type-registered',function(type) {
if (activeFlow) {
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activeFlow.typeRegistered(type);
log.info("Missing type registered: "+type);
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}
});
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var flowNodes = module.exports = {
init: function(_storage) {
storage = _storage;
},
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/**
* Load the current activeConfig from storage and start it running
* @return a promise for the loading of the config
*/
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load: function() {
return storage.getFlows().then(function(flows) {
return credentials.load().then(function() {
activeFlow = new Flow(flows);
flowNodes.startFlows();
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});
}).otherwise(function(err) {
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log.warn("Error loading flows : "+err);
console.log(err.stack);
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});
},
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/**
* Get a node
* @param i the node id
* @return the node
*/
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get: function(i) {
return activeFlow.getNode(i);
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},
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eachNode: function(cb) {
activeFlow.eachNode(cb);
},
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/**
* @return the active configuration
*/
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getFlows: function() {
return activeFlow.getFlow();
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},
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/**
* Sets the current active config.
* @param config the configuration to enable
* @param type the type of deployment to do: full (default), nodes, flows
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* @return a promise for the starting of the new flow
*/
setFlows: function (config,type) {
type = type||"full";
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var credentialsChanged = false;
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var credentialSavePromise = null;
// Clone config and extract credentials prior to saving
// Original config needs to retain credentials so that flow.applyConfig
// knows which nodes have had changes.
var cleanConfig = clone(config);
cleanConfig.forEach(function(node) {
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if (node.credentials) {
credentials.extract(node);
credentialsChanged = true;
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}
});
if (credentialsChanged) {
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credentialSavePromise = credentials.save();
} else {
credentialSavePromise = when.resolve();
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}
if (type=="full") {
return credentialSavePromise
.then(function() { return storage.saveFlows(cleanConfig);})
.then(function() { return flowNodes.stopFlows(); })
.then(function() { activeFlow = new Flow(config); flowNodes.startFlows();});
} else {
return credentialSavePromise
.then(function() { return storage.saveFlows(cleanConfig);})
.then(function() {
var configDiff = activeFlow.diffConfig(config,type);
return flowNodes.stopFlows(configDiff).then(function() {
activeFlow.parseConfig(config);
flowNodes.startFlows(configDiff);
});
});
}
},
startFlows: function(configDiff) {
if (configDiff) {
log.info("Starting modified "+configDiff.type);
} else {
log.info("Starting flows");
}
try {
activeFlow.start(configDiff);
if (configDiff) {
log.info("Started modified "+configDiff.type);
} else {
log.info("Started flows");
}
} catch(err) {
var missingTypes = activeFlow.getMissingTypes();
if (missingTypes.length > 0) {
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log.info("Waiting for missing types to be registered:");
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for (var i=0;i<missingTypes.length;i++) {
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log.info(" - "+missingTypes[i]);
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}
}
}
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},
stopFlows: function(configDiff) {
if (configDiff) {
log.info("Stopping modified "+configDiff.type);
} else {
log.info("Stopping flows");
}
if (activeFlow) {
return activeFlow.stop(configDiff).then(function() {
if (configDiff) {
log.info("Stopped modified "+configDiff.type);
} else {
log.info("Stopped flows");
}
return;
});
} else {
log.info("Stopped");
return;
}
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},
handleError: function(node,logMessage,msg) {
activeFlow.handleError(node,logMessage,msg);
}
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};
var activeFlow = null;