mirror of https://github.com/node-red/node-red.git
327 lines
10 KiB
JavaScript
327 lines
10 KiB
JavaScript
/**
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* Copyright 2013, 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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var fs = require('fs');
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var when = require('when');
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var nodeFn = require('when/node/function');
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var keys = require('when/keys');
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var util = require('util');
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var fspath = require("path");
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var mkdirp = require("mkdirp");
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var promiseDir = nodeFn.lift(mkdirp);
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var settings;
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var flowsFile;
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var flowsFullPath;
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var flowsPrev;
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var credentialsFile;
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var oldCredentialsFile;
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var userDir;
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var libDir;
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var libFlowsDir;
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var globalSettingsFile;
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function listFiles(dir) {
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var dirs = {};
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var files = [];
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var dirCount = 0;
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return nodeFn.call(fs.readdir, dir).then(function (contents) {
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contents.sort().forEach(function(fn) {
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var stats = fs.lstatSync(dir+"/"+fn);
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if (stats.isDirectory()) {
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dirCount += 1;
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dirs[fn] = listFiles(dir+"/"+fn)
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} else {
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files.push(fn.split(".")[0]);
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}
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})
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var result = {};
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if (dirCount > 0) { result.d = keys.all(dirs); }
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if (files.length > 0) { result.f = when.resolve(files); }
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return keys.all(result);
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})
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}
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function getFileMeta(root,path) {
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var fn = fspath.join(root,path);
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var fd = fs.openSync(fn,"r");
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var size = fs.fstatSync(fd).size;
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var meta = {};
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var read = 0;
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var length = 10;
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var remaining = "";
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var buffer = Buffer(length);
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while(read < size) {
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read+=fs.readSync(fd,buffer,0,length);
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var data = remaining+buffer.toString();
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var parts = data.split("\n");
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remaining = parts.splice(-1);
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for (var i=0;i<parts.length;i+=1) {
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var match = /^\/\/ (\w+): (.*)/.exec(parts[i]);
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if (match) {
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meta[match[1]] = match[2];
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} else {
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read = size;
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break;
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}
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}
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}
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fs.closeSync(fd);
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return meta;
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}
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function getFileBody(root,path) {
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var body = "";
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var fn = fspath.join(root,path);
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var fd = fs.openSync(fn,"r");
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var size = fs.fstatSync(fd).size;
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var scanning = true;
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var read = 0;
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var length = 50;
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var remaining = "";
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var buffer = Buffer(length);
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while(read < size) {
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var thisRead = fs.readSync(fd,buffer,0,length);
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read += thisRead;
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if (scanning) {
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var data = remaining+buffer.slice(0,thisRead).toString();
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var parts = data.split("\n");
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remaining = parts.splice(-1)[0];
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for (var i=0;i<parts.length;i+=1) {
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if (! /^\/\/ \w+: /.test(parts[i])) {
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scanning = false;
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body += parts[i]+"\n";
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}
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}
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if (! /^\/\/ \w+: /.test(remaining)) {
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scanning = false;
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}
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if (!scanning) {
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body += remaining;
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}
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} else {
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body += buffer.slice(0,thisRead).toString();
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}
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}
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fs.closeSync(fd);
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return body;
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}
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/**
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* Write content to a file using UTF8 encoding.
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* This forces a fsync before completing to ensure
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* the write hits disk.
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*/
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function writeFile(path,content) {
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return when.promise(function(resolve,reject) {
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var stream = fs.createWriteStream(path);
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stream.on('open',function(fd) {
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stream.end(content,'utf8',function() {
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fs.fsync(fd,resolve);
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});
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});
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stream.on('error',function(err) {
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reject(err);
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});
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});
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}
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var localfilesystem = {
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init: function(_settings) {
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settings = _settings;
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userDir = settings.userDir || process.env.NODE_RED_HOME;
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if (settings.flowFile) {
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flowsFile = settings.flowFile;
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flowsFullPath = flowsFile;
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} else {
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flowsFile = 'flows_'+require('os').hostname()+'.json';
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flowsFullPath = fspath.join(userDir,flowsFile);
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}
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var fsext = fspath.extname(flowsFile);
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credentialsFile = fspath.join(userDir,fspath.basename(flowsFile,fsext)+"_cred"+fsext);
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oldCredentialsFile = fspath.join(userDir,"credentials.json");
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flowsPrev = fspath.join(userDir,"flows.backup");
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libDir = fspath.join(userDir,"lib");
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libFlowsDir = fspath.join(libDir,"flows");
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globalSettingsFile = fspath.join(userDir,".config.json");
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return promiseDir(libFlowsDir);
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},
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getFlows: function() {
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var defer = when.defer();
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fs.exists(flowsFullPath, function(exists) {
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if (exists) {
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util.log("[red] Loading flows : "+flowsFile);
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defer.resolve(nodeFn.call(fs.readFile,flowsFullPath,'utf8').then(function(data) {
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return JSON.parse(data);
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}));
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} else {
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util.log("[red] Flows file not found : "+flowsFile );
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defer.resolve([]);
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}
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});
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return defer.promise;
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},
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saveFlows: function(flows) {
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if (fs.existsSync(flowsFullPath)) {
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fs.renameSync(flowsFullPath,flowsPrev);
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}
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var flowData;
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if (settings.flowFilePretty) {
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flowData = JSON.stringify(flows,null,4);
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} else {
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flowData = JSON.stringify(flows);
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}
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return writeFile(flowsFullPath, flowData);
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},
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getCredentials: function() {
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var defer = when.defer();
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fs.exists(credentialsFile, function(exists) {
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if (exists) {
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defer.resolve(nodeFn.call(fs.readFile, credentialsFile, 'utf8').then(function(data) {
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return JSON.parse(data)
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}));
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} else {
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fs.exists(oldCredentialsFile, function(exists) {
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if (exists) {
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defer.resolve(nodeFn.call(fs.readFile, oldCredentialsFile, 'utf8').then(function(data) {
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return JSON.parse(data)
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}));
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} else {
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defer.resolve({});
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}
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});
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}
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});
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return defer.promise;
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},
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saveCredentials: function(credentials) {
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var credentialData;
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if (settings.flowFilePretty) {
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credentialData = JSON.stringify(credentials,null,4);
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} else {
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credentialData = JSON.stringify(credentials);
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}
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return writeFile(credentialsFile, credentialData);
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},
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getSettings: function() {
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if (fs.existsSync(globalSettingsFile)) {
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return nodeFn.call(fs.readFile,globalSettingsFile,'utf8').then(function(data) {
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if (data) {
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try {
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return JSON.parse(data);
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} catch(err) {
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util.log("[red] Corrupted config detected - resetting");
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return {};
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}
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} else {
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return {};
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}
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});
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}
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return when.resolve({});
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},
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saveSettings: function(settings) {
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return writeFile(globalSettingsFile,JSON.stringify(settings,null,1));
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},
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getAllFlows: function() {
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return listFiles(libFlowsDir);
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},
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getFlow: function(fn) {
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var defer = when.defer();
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var file = fspath.join(libFlowsDir,fn+".json");
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fs.exists(file, function(exists) {
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if (exists) {
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defer.resolve(nodeFn.call(fs.readFile,file,'utf8'));
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} else {
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defer.reject();
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}
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});
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return defer.promise;
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},
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saveFlow: function(fn,data) {
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var file = fspath.join(libFlowsDir,fn+".json");
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return promiseDir(fspath.dirname(file)).then(function () {
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return writeFile(file,data);
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});
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},
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getLibraryEntry: function(type,path) {
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var root = fspath.join(libDir,type);
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var rootPath = fspath.join(libDir,type,path);
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return promiseDir(root).then(function () {
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return nodeFn.call(fs.lstat, rootPath).then(function(stats) {
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if (stats.isFile()) {
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return getFileBody(root,path);
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}
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if (path.substr(-1) == '/') {
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path = path.substr(0,path.length-1);
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}
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return nodeFn.call(fs.readdir, rootPath).then(function(fns) {
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var dirs = [];
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var files = [];
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fns.sort().filter(function(fn) {
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var fullPath = fspath.join(path,fn);
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var absoluteFullPath = fspath.join(root,fullPath);
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if (fn[0] != ".") {
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var stats = fs.lstatSync(absoluteFullPath);
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if (stats.isDirectory()) {
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dirs.push(fn);
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} else {
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var meta = getFileMeta(root,fullPath);
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meta.fn = fn;
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files.push(meta);
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}
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}
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});
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return dirs.concat(files);
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});
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});
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});
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},
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saveLibraryEntry: function(type,path,meta,body) {
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var fn = fspath.join(libDir, type, path);
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var headers = "";
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for (var i in meta) {
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if (meta.hasOwnProperty(i)) {
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headers += "// "+i+": "+meta[i]+"\n";
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}
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}
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return promiseDir(fspath.dirname(fn)).then(function () {
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writeFile(fn,headers+body);
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});
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}
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};
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module.exports = localfilesystem;
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