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couchstorage.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 nano = require('nano');
var when = require('when');
var util = require('util');
var settings;
var appname;
var flowDb = null;
var currentFlowRev = null;
var currentSettingsRev = null;
var currentCredRev = null;
var libraryCache = {};
var couchstorage = {
init: function(_settings) {
settings = _settings;
var couchDb = nano(settings.couchUrl);
appname = settings.couchAppname || require('os').hostname();
var dbname = settings.couchDb||"nodered";
return when.promise(function(resolve,reject) {
couchDb.db.get(dbname,function(err,body) {
if (err) {
couchDb.db.create(dbname,function(err,body) {
if (err) {
reject("Failed to create database: "+err);
} else {
flowDb = couchDb.use(dbname);
flowDb.insert({
views:{
flow_entries_by_app_and_type:{
map:function(doc) {
var p = doc._id.split("/");
if (p.length > 2 && p[2] == "flow") {
var meta = {path:p.slice(3).join("/")};
emit([p[0],p[2]],meta);
}
}
},
lib_entries_by_app_and_type:{
map:function(doc) {
var p = doc._id.split("/");
if (p.length > 2) {
if (p[2] != "flow") {
var pathParts = p.slice(3,-1);
for (var i=0;i<pathParts.length;i++) {
emit([p[0],p[2],pathParts.slice(0,i).join("/")],{dir:pathParts.slice(i,i+1)[0]});
}
var meta = {};
for (var key in doc.meta) {
meta[key] = doc.meta[key];
}
meta.fn = p.slice(-1)[0];
emit([p[0],p[2],pathParts.join("/")],meta);
}
}
}
}
}
},"_design/library",function(err,b) {
if (err) {
reject("Failed to create view: "+err);
} else {
resolve();
}
});
}
});
} else {
flowDb = couchDb.use(dbname);
resolve();
}
});
});
},
getFlows: function() {
var key = appname+"/"+"flow";
return when.promise(function(resolve,reject) {
flowDb.get(key,function(err,doc) {
if (err) {
if (err.status_code != 404) {
reject(err.toString());
} else {
resolve([]);
}
} else {
currentFlowRev = doc._rev;
resolve(doc.flow);
}
});
});
},
saveFlows: function(flows) {
var key = appname+"/"+"flow";
return when.promise(function(resolve,reject) {
var doc = {_id:key,flow:flows};
if (currentFlowRev) {
doc._rev = currentFlowRev;
}
flowDb.insert(doc,function(err,db) {
if (err) {
reject(err.toString());
} else {
currentFlowRev = db.rev;
resolve();
}
});
});
},
getCredentials: function() {
var key = appname+"/"+"credential";
return when.promise(function(resolve,reject) {
flowDb.get(key,function(err,doc) {
if (err) {
if (err.status_code != 404) {
reject(err.toString());
} else {
resolve({});
}
} else {
currentCredRev = doc._rev;
resolve(doc.credentials);
}
});
});
},
saveCredentials: function(credentials) {
var key = appname+"/"+"credential";
return when.promise(function(resolve,reject) {
var doc = {_id:key,credentials:credentials};
if (currentCredRev) {
doc._rev = currentCredRev;
}
flowDb.insert(doc,function(err,db) {
if (err) {
reject(err.toString());
} else {
currentCredRev = db.rev;
resolve();
}
});
});
},
getSettings: function() {
var key = appname+"/"+"settings";
return when.promise(function(resolve,reject) {
flowDb.get(key,function(err,doc) {
if (err) {
if (err.status_code != 404) {
reject(err.toString());
} else {
resolve({});
}
} else {
currentSettingsRev = doc._rev;
resolve(doc.settings);
}
});
});
},
saveSettings: function(settings) {
var key = appname+"/"+"settings";
return when.promise(function(resolve,reject) {
var doc = {_id:key,settings:settings};
if (currentSettingsRev) {
doc._rev = currentSettingsRev;
}
flowDb.insert(doc,function(err,db) {
if (err) {
reject(err.toString());
} else {
currentSettingsRev = db.rev;
resolve();
}
});
});
},
getAllFlows: function() {
var key = [appname,"flow"];
return when.promise(function(resolve,reject) {
flowDb.view('library','flow_entries_by_app_and_type',{key:key}, function(e,data) {
if (e) {
reject(e.toString());
} else {
var result = {};
for (var i=0;i<data.rows.length;i++) {
var doc = data.rows[i];
var path = doc.value.path;
var parts = path.split("/");
var ref = result;
for (var j=0;j<parts.length-1;j++) {
ref['d'] = ref['d']||{};
ref['d'][parts[j]] = ref['d'][parts[j]]||{};
ref = ref['d'][parts[j]];
}
ref['f'] = ref['f']||[];
ref['f'].push(parts.slice(-1)[0]);
}
resolve(result);
}
});
});
},
getFlow: function(fn) {
if (fn.substr(0) != "/") {
fn = "/"+fn;
}
var key = appname+"/lib/flow"+fn;
return when.promise(function(resolve,reject) {
flowDb.get(key,function(err,data) {
if (err) {
reject(err);
} else {
resolve(data.data);
}
});
});
},
saveFlow: function(fn,data) {
if (fn.substr(0) != "/") {
fn = "/"+fn;
}
var key = appname+"/lib/flow"+fn;
return when.promise(function(resolve,reject) {
var doc = {_id:key,data:data};
flowDb.get(key,function(err,d) {
if (d) {
doc._rev = d._rev;
}
flowDb.insert(doc,function(err,d) {
if (err) {
reject(err);
} else {
resolve();
}
});
});
});
},
getLibraryEntry: function(type,path) {
var key = appname+"/lib/"+type+(path.substr(0)!="/"?"/":"")+path;
if (libraryCache[key]) {
return when.resolve(libraryCache[key]);
}
return when.promise(function(resolve,reject) {
flowDb.get(key,function(err,doc) {
if (err) {
if (path.substr(-1) == "/") {
path = path.substr(0,path.length-1);
}
var qkey = [appname,type,path];
flowDb.view('library','lib_entries_by_app_and_type',{key:qkey}, function(e,data) {
if (e) {
reject(e);
} else {
var dirs = [];
var files = [];
for (var i=0;i<data.rows.length;i++) {
var row = data.rows[i];
var value = row.value;
if (value.dir) {
if (dirs.indexOf(value.dir) == -1) {
dirs.push(value.dir);
}
} else {
files.push(value);
}
}
libraryCache[key] = dirs.concat(files);
resolve(libraryCache[key]);
}
});
} else {
libraryCache[key] = doc.body;
resolve(doc.body);
}
});
});
},
saveLibraryEntry: function(type,path,meta,body) {
if (path.substr(0) != "/") {
path = "/"+path;
}
var key = appname+"/lib/"+type+path;
return when.promise(function(resolve,reject) {
var doc = {_id:key,meta:meta,body:body};
flowDb.get(key,function(err,d) {
if (d) {
doc._rev = d._rev;
}
flowDb.insert(doc,function(err,d) {
if (err) {
reject(err);
} else {
var p = path.split("/");
for (var i=0;i<p.length;i++) {
delete libraryCache[appname+"/lib/"+type+(p.slice(0,i).join("/"))]
}
libraryCache[key] = body;
resolve();
}
});
});
});
}
};
module.exports = couchstorage;