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node-red/red/storage/localfilesystem.js

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/**
* Copyright 2013, 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 fs = require('fs');
var when = require('when');
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var nodeFn = require('when/node/function');
var keys = require('when/keys');
var fspath = require("path");
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var mkdirp = require("mkdirp");
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var log = require("../log");
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var promiseDir = nodeFn.lift(mkdirp);
var settings;
var flowsFile;
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var flowsFullPath;
var flowsFileBackup;
var credentialsFile;
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var credentialsFileBackup;
var oldCredentialsFile;
var userDir;
var libDir;
var libFlowsDir;
var globalSettingsFile;
function listFiles(dir) {
var dirs = {};
var files = [];
var dirCount = 0;
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return nodeFn.call(fs.readdir, dir).then(function (contents) {
contents.sort().forEach(function(fn) {
var stats = fs.lstatSync(dir+"/"+fn);
if (stats.isDirectory()) {
dirCount += 1;
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dirs[fn] = listFiles(dir+"/"+fn)
} else {
files.push(fn.split(".")[0]);
}
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})
var result = {};
if (dirCount > 0) { result.d = keys.all(dirs); }
if (files.length > 0) { result.f = when.resolve(files); }
return keys.all(result);
})
}
function getFileMeta(root,path) {
var fn = fspath.join(root,path);
var fd = fs.openSync(fn,"r");
var size = fs.fstatSync(fd).size;
var meta = {};
var read = 0;
var length = 10;
var remaining = "";
var buffer = Buffer(length);
while(read < size) {
read+=fs.readSync(fd,buffer,0,length);
var data = remaining+buffer.toString();
var parts = data.split("\n");
remaining = parts.splice(-1);
for (var i=0;i<parts.length;i+=1) {
var match = /^\/\/ (\w+): (.*)/.exec(parts[i]);
if (match) {
meta[match[1]] = match[2];
} else {
read = size;
break;
}
}
}
fs.closeSync(fd);
return meta;
}
function getFileBody(root,path) {
var body = "";
var fn = fspath.join(root,path);
var fd = fs.openSync(fn,"r");
var size = fs.fstatSync(fd).size;
var scanning = true;
var read = 0;
var length = 50;
var remaining = "";
var buffer = Buffer(length);
while(read < size) {
var thisRead = fs.readSync(fd,buffer,0,length);
read += thisRead;
if (scanning) {
var data = remaining+buffer.slice(0,thisRead).toString();
var parts = data.split("\n");
remaining = parts.splice(-1)[0];
for (var i=0;i<parts.length;i+=1) {
if (! /^\/\/ \w+: /.test(parts[i])) {
scanning = false;
body += parts[i]+"\n";
}
}
if (! /^\/\/ \w+: /.test(remaining)) {
scanning = false;
}
if (!scanning) {
body += remaining;
}
} else {
body += buffer.slice(0,thisRead).toString();
}
}
fs.closeSync(fd);
return body;
}
/**
* Write content to a file using UTF8 encoding.
* This forces a fsync before completing to ensure
* the write hits disk.
*/
function writeFile(path,content) {
return when.promise(function(resolve,reject) {
var stream = fs.createWriteStream(path);
stream.on('open',function(fd) {
stream.end(content,'utf8',function() {
fs.fsync(fd,resolve);
});
});
stream.on('error',function(err) {
reject(err);
});
});
}
var localfilesystem = {
init: function(_settings) {
settings = _settings;
userDir = settings.userDir || process.env.NODE_RED_HOME;
if (settings.flowFile) {
flowsFile = settings.flowFile;
flowsFullPath = flowsFile;
} else {
flowsFile = 'flows_'+require('os').hostname()+'.json';
flowsFullPath = fspath.join(userDir,flowsFile);
}
var ffExt = fspath.extname(flowsFullPath);
var ffName = fspath.basename(flowsFullPath);
var ffBase = fspath.basename(flowsFullPath,ffExt);
var ffDir = fspath.dirname(flowsFullPath);
credentialsFile = fspath.join(userDir,ffBase+"_cred"+ffExt);
credentialsFileBackup = fspath.join(userDir,"."+ffBase+"_cred"+ffExt+".backup");
oldCredentialsFile = fspath.join(userDir,"credentials.json");
flowsFileBackup = fspath.join(ffDir,"."+ffName+".backup");
libDir = fspath.join(userDir,"lib");
libFlowsDir = fspath.join(libDir,"flows");
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globalSettingsFile = fspath.join(userDir,".config.json");
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return promiseDir(libFlowsDir);
},
getFlows: function() {
var defer = when.defer();
fs.exists(flowsFullPath, function(exists) {
if (exists) {
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log.info("Loading flows : "+flowsFile);
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defer.resolve(nodeFn.call(fs.readFile,flowsFullPath,'utf8').then(function(data) {
return JSON.parse(data);
}));
} else {
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log.info("Flows file not found : "+flowsFile );
defer.resolve([]);
}
});
return defer.promise;
},
saveFlows: function(flows) {
if (fs.existsSync(flowsFullPath)) {
fs.renameSync(flowsFullPath,flowsFileBackup);
}
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var flowData;
if (settings.flowFilePretty) {
flowData = JSON.stringify(flows,null,4);
} else {
flowData = JSON.stringify(flows);
}
return writeFile(flowsFullPath, flowData);
},
getCredentials: function() {
var defer = when.defer();
fs.exists(credentialsFile, function(exists) {
if (exists) {
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defer.resolve(nodeFn.call(fs.readFile, credentialsFile, 'utf8').then(function(data) {
return JSON.parse(data)
}));
} else {
fs.exists(oldCredentialsFile, function(exists) {
if (exists) {
defer.resolve(nodeFn.call(fs.readFile, oldCredentialsFile, 'utf8').then(function(data) {
return JSON.parse(data)
}));
} else {
defer.resolve({});
}
});
}
});
return defer.promise;
},
saveCredentials: function(credentials) {
if (fs.existsSync(credentialsFile)) {
fs.renameSync(credentialsFile,credentialsFileBackup);
}
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var credentialData;
if (settings.flowFilePretty) {
credentialData = JSON.stringify(credentials,null,4);
} else {
credentialData = JSON.stringify(credentials);
}
return writeFile(credentialsFile, credentialData);
},
getSettings: function() {
if (fs.existsSync(globalSettingsFile)) {
return nodeFn.call(fs.readFile,globalSettingsFile,'utf8').then(function(data) {
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if (data) {
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try {
return JSON.parse(data);
} catch(err) {
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log.info("Corrupted config detected - resetting");
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return {};
}
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} else {
return {};
}
});
}
return when.resolve({});
},
saveSettings: function(settings) {
return writeFile(globalSettingsFile,JSON.stringify(settings,null,1));
},
getAllFlows: function() {
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return listFiles(libFlowsDir);
},
getFlow: function(fn) {
var defer = when.defer();
var file = fspath.join(libFlowsDir,fn+".json");
fs.exists(file, function(exists) {
if (exists) {
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defer.resolve(nodeFn.call(fs.readFile,file,'utf8'));
} else {
defer.reject();
}
});
return defer.promise;
},
saveFlow: function(fn,data) {
var file = fspath.join(libFlowsDir,fn+".json");
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return promiseDir(fspath.dirname(file)).then(function () {
return writeFile(file,data);
});
},
getLibraryEntry: function(type,path) {
var root = fspath.join(libDir,type);
var rootPath = fspath.join(libDir,type,path);
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return promiseDir(root).then(function () {
return nodeFn.call(fs.lstat, rootPath).then(function(stats) {
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if (stats.isFile()) {
return getFileBody(root,path);
}
if (path.substr(-1) == '/') {
path = path.substr(0,path.length-1);
}
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return nodeFn.call(fs.readdir, rootPath).then(function(fns) {
var dirs = [];
var files = [];
fns.sort().filter(function(fn) {
var fullPath = fspath.join(path,fn);
var absoluteFullPath = fspath.join(root,fullPath);
if (fn[0] != ".") {
var stats = fs.lstatSync(absoluteFullPath);
if (stats.isDirectory()) {
dirs.push(fn);
} else {
var meta = getFileMeta(root,fullPath);
meta.fn = fn;
files.push(meta);
}
}
});
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return dirs.concat(files);
});
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});
});
},
saveLibraryEntry: function(type,path,meta,body) {
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var fn = fspath.join(libDir, type, path);
var headers = "";
for (var i in meta) {
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if (meta.hasOwnProperty(i)) {
headers += "// "+i+": "+meta[i]+"\n";
}
}
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return promiseDir(fspath.dirname(fn)).then(function () {
writeFile(fn,headers+body);
});
}
};
module.exports = localfilesystem;