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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");
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);
if (missingTypes.length === 0) {
parseConfig();
}
}
}
});
/**
* Parses the current activeConfig and creates the required node instances
*/
function parseConfig() {
var i;
var nt;
missingTypes = [];
// Scan the configuration for any unknown node types
for (i=0;i<activeConfig.length;i++) {
var type = activeConfig[i].type;
// TODO: remove workspace in next release+1
if (type != "workspace" && type != "tab") {
nt = typeRegistry.get(type);
if (!nt && missingTypes.indexOf(type) == -1) {
missingTypes.push(type);
}
}
}
// Abort if there are any missing types
if (missingTypes.length > 0) {
util.log("[red] Waiting for missing types to be registered:");
for (i=0;i<missingTypes.length;i++) {
util.log("[red] - "+missingTypes[i]);
}
return;
}
util.log("[red] Starting flows");
events.emit("nodes-starting");
// Instantiate each node in the flow
for (i=0;i<activeConfig.length;i++) {
var nn = null;
// TODO: remove workspace in next release+1
if (activeConfig[i].type != "workspace" && activeConfig[i].type != "tab") {
nt = typeRegistry.get(activeConfig[i].type);
if (nt) {
try {
nn = new nt(activeConfig[i]);
}
catch (err) {
util.log("[red] "+activeConfig[i].type+" : "+err);
}
}
// console.log(nn);
if (nn === null) {
util.log("[red] unknown type: "+activeConfig[i].type);
}
}
}
// Clean up any orphaned credentials
credentials.clean(flowNodes.get);
events.emit("nodes-started");
}
/**
* Stops the current activeConfig
*/
function stopFlows() {
if (activeConfig&&activeConfig.length > 0) {
util.log("[red] Stopping flows");
}
return flowNodes.clear();
}
var flowNodes = module.exports = {
init: function(_storage) {
storage = _storage;
},
/**
* Load the current activeConfig from storage and start it running
* @return a promise for the loading of the config
*/
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 a node to the current active set
* @param n the node to add
*/
add: function(n) {
nodes[n.id] = n;
n.on("log",log.log);
},
/**
* Get a node
* @param i the node id
* @return the node
*/
get: function(i) {
return nodes[i];
},
/**
* Stops all active nodes and clears the active set
* @return a promise for the stopping of all active nodes
*/
clear: function() {
return when.promise(function(resolve) {
events.emit("nodes-stopping");
var promises = [];
for (var n in nodes) {
if (nodes.hasOwnProperty(n)) {
try {
var p = nodes[n].close();
if (p) {
promises.push(p);
}
} catch(err) {
nodes[n].error(err);
}
}
}
when.settle(promises).then(function() {
events.emit("nodes-stopped");
nodes = {};
resolve();
});
});
},
/**
* Provides an iterator over the active set of nodes
* @param cb a function to be called for each node in the active set
*/
each: function(cb) {
for (var n in nodes) {
if (nodes.hasOwnProperty(n)) {
cb(nodes[n]);
}
}
},
/**
* @return the active configuration
*/
getFlows: function() {
return activeConfig;
},
/**
* Sets the current active config.
* @param config the configuration to enable
* @return a promise for the starting of the new flow
*/
setFlows: function (config) {
// Extract any credential updates
for (var i=0; i<config.length; i++) {
var node = config[i];
if (node.credentials) {
credentials.extract(node);
delete node.credentials;
}
}
return credentials.save()
.then(function() { return storage.saveFlows(config);})
.then(function() { return stopFlows();})
.then(function () {
activeConfig = config;
parseConfig();
});
},
stopFlows: stopFlows
};
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