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node-red/red/nodes/flows.js

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/**
* Copyright 2014 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 util = require("util");
var when = require("when");
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var typeRegistry = require("./registry");
var credentials = require("./credentials");
var log = require("../log");
var events = require("../events");
var storage = null;
var nodes = {};
var activeConfig = [];
var missingTypes = [];
events.on('type-registered',function(type) {
if (missingTypes.length > 0) {
var i = missingTypes.indexOf(type);
if (i != -1) {
missingTypes.splice(i,1);
util.log("[red] Missing type registered: "+type);
}
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if (missingTypes.length === 0) {
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parseConfig();
}
}
});
var parseCredentials = function (config) {
return when.promise(function (resolve, defect) {
for (var i in config) {
if (config.hasOwnProperty(i)) {
var node = config[i];
if (!node._creds) {
continue;
}
var type = node.type;
credentials.merge(node.id, type, node._creds);
delete node._creds;
}
}
credentials.save().then(function () {
resolve(config);
}).otherwise(function (err) {
defect(err);
});
});
}
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var parseConfig = function() {
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var i;
var nt;
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missingTypes = [];
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for (i=0;i<activeConfig.length;i++) {
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var type = activeConfig[i].type;
// TODO: remove workspace in next release+1
if (type != "workspace" && type != "tab") {
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nt = typeRegistry.get(type);
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if (!nt && missingTypes.indexOf(type) == -1) {
missingTypes.push(type);
}
}
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}
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if (missingTypes.length > 0) {
util.log("[red] Waiting for missing types to be registered:");
for (i=0;i<missingTypes.length;i++) {
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util.log("[red] - "+missingTypes[i]);
}
return;
}
util.log("[red] Starting flows");
events.emit("nodes-starting");
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for (i=0;i<activeConfig.length;i++) {
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var nn = null;
// TODO: remove workspace in next release+1
if (activeConfig[i].type != "workspace" && activeConfig[i].type != "tab") {
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nt = typeRegistry.get(activeConfig[i].type);
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if (nt) {
try {
nn = new nt(activeConfig[i]);
}
catch (err) {
util.log("[red] "+activeConfig[i].type+" : "+err);
}
}
// console.log(nn);
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if (nn === null) {
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util.log("[red] unknown type: "+activeConfig[i].type);
}
}
}
// Clean up any orphaned credentials
credentials.clean(flowNodes.get);
events.emit("nodes-started");
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};
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function stopFlows() {
if (activeConfig&&activeConfig.length > 0) {
util.log("[red] Stopping flows");
}
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return flowNodes.clear();
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}
var flowNodes = module.exports = {
init: function(_storage) {
storage = _storage;
},
load: function() {
return storage.getFlows().then(function(flows) {
return credentials.load().then(function() {
activeConfig = flows;
if (activeConfig && activeConfig.length > 0) {
parseConfig();
}
});
}).otherwise(function(err) {
util.log("[red] Error loading flows : "+err);
});
},
add: function(n) {
nodes[n.id] = n;
n.on("log",log.log);
},
get: function(i) {
return nodes[i];
},
clear: function() {
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return when.promise(function(resolve) {
events.emit("nodes-stopping");
var promises = [];
for (var n in nodes) {
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if (nodes.hasOwnProperty(n)) {
try {
var p = nodes[n].close();
if (p) {
promises.push(p);
}
} catch(err) {
nodes[n].error(err);
}
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}
}
when.settle(promises).then(function() {
events.emit("nodes-stopped");
nodes = {};
resolve();
});
});
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},
each: function(cb) {
for (var n in nodes) {
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if (nodes.hasOwnProperty(n)) {
cb(nodes[n]);
}
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}
},
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getFlows: function() {
return activeConfig;
},
setFlows: function (conf) {
return parseCredentials(conf).then(function (confCredsRemoved) {
return storage.saveFlows(confCredsRemoved).then(function () {
return stopFlows().then(function () {
activeConfig = confCredsRemoved;
parseConfig();
});
})
})
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},
stopFlows: stopFlows
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};