Abstract all file-system operations

Stage 1 of  #62

package.json

@@ -21,6 +21,7 @@
     ],
     "dependencies": {
         "express": "3.x",
+        "when": "~2.6.0",
         "mqtt": "~0.3.3",
         "ws": "~0.4.31",
         "mustache": "~0.7.2",

red/library.js

@@ -14,78 +14,49 @@
  * limitations under the License.
  **/
 
-var fs = require("fs");
-var fspath = require("path");
 var redApp = null;
+var storage = null;
 
 function init() {
     redApp = require("./server").app;
+    storage = require("./storage").storage;
+    
     // -------- Flow Library --------
     redApp.post(new RegExp("/library/flows\/(.*)"), function(req,res) {
             var fullBody = '';
             req.on('data', function(chunk) {
-                    fullBody += chunk.toString();
+                fullBody += chunk.toString();
             });
             req.on('end', function() {
-                    var fn = "lib/flows/"+req.params[0]+".json";
+                storage.saveFlow(req.params[0],fullBody).then(function() {
-                    var parts = fn.split("/");
+                    res.writeHead(204, {'Content-Type': 'text/plain'});
-                    for (var i = 3;i<parts.length;i+=1) {
+                    res.end();
-                        var dirname = parts.slice(0,i).join("/");
+                }).otherwise(function(err) {
-                        if (!fs.existsSync(dirname)) {
+                    util.log("[red] Error loading flow '"+req.params[0]+"' : "+err);
-                            fs.mkdirSync(dirname);
+                    res.send(500);
-                        }
+                });
-                    }
-                    fs.writeFile(fn,fullBody,function(err) {
-                            res.writeHead(204, {'Content-Type': 'text/plain'});
-                            res.end();
-                    });
-                    
             });
     });
     
-    function listFiles(dir) {
-        var dirs = {};
-        var files = [];
-        var dirCount = 0;
-        fs.readdirSync(dir).sort().filter(function(fn) {
-                var stats = fs.lstatSync(dir+"/"+fn);
-                if (stats.isDirectory()) {
-                    dirCount += 1;
-                    dirs[fn] = listFiles(dir+"/"+fn);
-                } else {
-                    files.push(fn.split(".")[0]);
-                }
-        });
-        var result = {};
-        if (dirCount > 0) { result.d = dirs; }
-        if (files.length > 0) { result.f = files; }
-        return result;
-    }
-    
     redApp.get("/library/flows",function(req,res) {
-            var flows = {};
+            storage.getAllFlows().then(function(flows) {
-            if (fs.existsSync("lib/flows")) {
+                res.writeHead(200, {'Content-Type': 'text/plain'});
-                flows = listFiles("lib/flows");
+                res.write(JSON.stringify(flows));
-            } else {
+                res.end();
-                fs.mkdirSync("lib/flows");
+            });
-            }
-            res.writeHead(200, {'Content-Type': 'text/plain'});
-            res.write(JSON.stringify(flows));
-            res.end();
-            
     });
     
     redApp.get(new RegExp("/library/flows\/(.*)"), function(req,res) {
-            var fn = "lib/flows/"+req.params[0]+".json";
+            storage.getFlow(req.params[0]).then(function(data) {
-            if (fs.existsSync(fn)) {
+                res.writeHead(200, {'Content-Type': 'text/plain'});
-                fs.readFile(fn,function(err,data) {
+                res.write(data);
-                        res.writeHead(200, {'Content-Type': 'text/plain'});
+                res.end();
-                        res.write(data);
+            }).otherwise(function(err) {
-                        res.end();
+                if (err) {
-                });
+                    util.log("[red] Error loading flow '"+req.params[0]+"' : "+err);
-            } else {
+                }
                 res.send(404);
-            }
+            });
     });
     
     // ------------------------------
@@ -93,53 +64,21 @@ function init() {
 
 function createLibrary(type) {
     
-    //TODO: use settings.library as the base root
-    
-    var root = fspath.join("lib",type)+"/";
-    
-    fs.exists(root,function(exists) {
-            if (!exists) {
-                fs.mkdir(root);
-            }
-    });
     redApp.get(new RegExp("/library/"+type+"($|\/(.*))"),function(req,res) {
             var path = req.params[1]||"";
-            var rootPath = fspath.join(root,path);
+            storage.getLibraryEntry(type,path).then(function(result) {
-            
+                res.writeHead(200, {'Content-Type': 'text/plain'});
-            fs.exists(rootPath,function(exists) {
+                if (typeof result === "string") {
-                    fs.lstat(rootPath,function(err,stats) {
+                    res.write(result);
-                            if (stats.isFile()) {
+                } else {
-                                getFileBody(root,path,res);
+                    res.write(JSON.stringify(result));
-                            } else {
+                }
-                                if (path.substr(-1) == '/') {
+                res.end(); 
-                                    path = path.substr(0,path.length-1);
+            }).otherwise(function(err) {
-                                }
+                if (err) {
-                                fs.readdir(rootPath,function(err,fns) {
+                    util.log("[red] Error loading library entry '"+path+"' : "+err);
-                                        var dirs = [];
+                }
-                                        var files = [];
+                res.send(404);
-                                        
-                                        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);
-                                                    }
-                                                }
-                                                
-                                        });
-                                        res.writeHead(200, {'Content-Type': 'text/plain'});
-                                        res.write(JSON.stringify(dirs.concat(files)));
-                                        res.end();
-                                });
-                            }
-                            
-                    });
             });
     });
     
@@ -150,103 +89,15 @@ function createLibrary(type) {
                     fullBody += chunk.toString();
             });
             req.on('end', function() {
-                    writeFile(root,path,req.query,fullBody,res);
+                    storage.saveLibraryEntry(type,path,req.query,fullBody).then(function() {
+                        res.send(204);
+                    }).otherwise(function(err) {
+                        util.log("[red] Error saving library entry '"+path+"' : "+err);
+                        res.send(500);
+                    });;
             });
     });
 }
 
-
-function writeFile(root,path,meta,body,res) {
-    var fn = fspath.join(root,path);
-    
-    var parts = path.split("/");
-    var dirname = root;
-    for (var i = 0;i<parts.length-1;i+=1) {
-        dirname = fspath.join(dirname,parts[i]);
-        if (!fs.existsSync(dirname)) {
-            fs.mkdirSync(dirname);
-        }
-    }
-    
-    var headers = "";
-    for (var i in meta) {
-        headers += "// "+i+": "+meta[i]+"\n";
-    }
-    fs.writeFile(fn,headers+body,function(err) {
-            //TODO: handle error
-            res.writeHead(204, {'Content-Type': 'text/plain'});
-            res.end();
-    });
-}
-
-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 scanning = true;
-    var read = 0;
-    var length = 10;
-    var offset = 0;
-    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,res) {
-    var fn = fspath.join(root,path);
-    res.writeHead(200, {'Content-Type': 'text/plain'});
-    var fd = fs.openSync(fn,"r");
-    var size = fs.fstatSync(fd).size;
-    var scanning = true;
-    var read = 0;
-    var length = 10;
-    var offset = 0;
-    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.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;
-                    res.write(parts[i]+"\n");
-                }
-            }
-            if (! /^\/\/ \w+: /.test(remaining)) {
-                scanning = false;
-            }
-            
-            if (!scanning) {
-                res.write(remaining);
-            }
-        } else {
-            res.write(buffer.slice(0,thisRead));
-        }
-    }
-    fs.closeSync(fd);
-    res.end();
-}
-
 module.exports.init = init;
 module.exports.register = createLibrary;

red/nodes.js

@@ -17,6 +17,7 @@ var util = require("util");
 var EventEmitter = require("events").EventEmitter;
 var fs = require("fs");
 var events = require("./events");
+var storage = null;
 
 function getCallerFilename(type) {
     //if (type == "summary") {
@@ -194,29 +195,17 @@ Node.prototype.error = function(msg) {
 }
 
 var credentials = {};
-var credentialsFile = "credentials.json";
-if (fs.existsSync(credentialsFile)) {
-    credentials = JSON.parse(fs.readFileSync(credentialsFile,'utf8'));
-}
-
-function saveCredentialsFile() {
-    fs.writeFile(credentialsFile, JSON.stringify(credentials), function(err) {
-            if(err) {
-                util.log(err);
-            }
-    });
-}
 
 module.exports.addCredentials = function(id,creds) {
     credentials[id] = creds;
-    saveCredentialsFile();
+    storage.saveCredentials(credentials);
 }
 module.exports.getCredentials = function(id) {
     return credentials[id];
 }
 module.exports.deleteCredentials = function(id) {
     delete credentials[id];
-    saveCredentialsFile();
+    storage.saveCredentials(credentials);
 }
 module.exports.createNode = function(node,def) {
     Node.call(node,def);
@@ -253,7 +242,7 @@ module.exports.load = function() {
     //events.emit("nodes-loaded");
 }
 
-var activeConfig = null;
+var activeConfig = [];
 var missingTypes = [];
 
 events.on('type-registered',function(type) {
@@ -285,7 +274,21 @@ module.exports.stopFlows = stopFlows;
 module.exports.setConfig = function(conf) {
     stopFlows();
     activeConfig = conf;
-    parseConfig();
+    
+    if (!storage) {
+        // Do this lazily to ensure the storage provider as been initialised
+        storage = require("./storage").storage;
+    }
+    storage.getCredentials().then(function(creds) {
+        credentials = creds;
+        parseConfig();
+    }).otherwise(function(err) {
+        util.log("[red] Error loading credentials : "+err);
+    });
+}
+
+module.exports.getConfig = function() {
+    return activeConfig;
 }
 
 var parseConfig = function() {
@@ -339,7 +342,7 @@ var parseConfig = function() {
         }
     }
     if (deletedCredentials) {
-        saveCredentialsFile();
+        storage.saveCredentials(credentials);
     }
     events.emit("nodes-started");
 }

red/server.js

@@ -14,31 +14,22 @@
  * limitations under the License.
  **/
 
-var fs = require('fs');
 var util = require('util');
 var createUI = require("./ui");
 var redNodes = require("./nodes");
 
-//TODO: relocated user dir
-
-var flowfile = '';
-
 var app = null;
 var server = null;
 
 function createServer(_server,settings) {
     server = _server;
+    
+    storage = require("./storage").init(settings);
+    
     app = createUI(settings);
     
     flowfile = settings.flowFile || 'flows_'+require('os').hostname()+'.json';
     
-    //TODO: relocated user dir
-    fs.exists("lib/",function(exists) {
-            if (!exists) {
-                fs.mkdir("lib");
-            }
-    });
-    
     app.get("/nodes",function(req,res) {
             res.writeHead(200, {'Content-Type': 'text/plain'});
             res.write(redNodes.getNodeConfigs());
@@ -46,15 +37,9 @@ function createServer(_server,settings) {
     });
     
     app.get("/flows",function(req,res) {
-            fs.exists(flowfile, function (exists) {
+            res.writeHead(200, {'Content-Type': 'text/plain'});
-                    if (exists) {
+            res.write(JSON.stringify(redNodes.getConfig()));
-                        res.sendfile(flowfile);
+            res.end();
-                    } else {
-                        res.writeHead(200, {'Content-Type': 'text/plain'});
-                        res.write("[]");
-                        res.end();
-                    }
-            });
     });
     
     app.post("/flows",function(req,res) {
@@ -65,12 +50,11 @@ function createServer(_server,settings) {
             req.on('end', function() {
                     res.writeHead(204, {'Content-Type': 'text/plain'});
                     res.end();
-                    fs.writeFile(flowfile, fullBody, function(err) {
+                    var flows = JSON.parse(fullBody);
-                            if(err) {
+                    storage.saveFlows(flows).then(function() {
-                                util.log(err);
+                        redNodes.setConfig(flows);
-                            } else {
+                    }).otherwise(function(err) {
-                                redNodes.setConfig(JSON.parse(fullBody));
+                        util.log("[red] Error saving flows : "+err);
-                            }
                     });
             });
     });
@@ -90,16 +74,12 @@ function start() {
     util.log('or any other errors are resolved');
     util.log("------------------------------------------");
     
-    
+    storage.getFlows().then(function(flows) {
-    fs.exists(flowfile, function (exists) {
+            if (flows.length > 0) {
-            if (exists) {
+                redNodes.setConfig(flows);
-                util.log("[red] Loading flows : "+flowfile);
-                fs.readFile(flowfile,'utf8',function(err,data) {
-                        redNodes.setConfig(JSON.parse(data));
-                });
-            } else {
-                util.log("[red] Flows file not found : "+flowfile);
             }
+    }).otherwise(function(err) {
+            util.log("[red] Error loading flows : "+err);
     });
 }
 

red/storage/index.js

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2013 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 settings;
+var storage;
+
+module.exports = {
+    init: function(_settings) {
+        settings = _settings;
+        
+        var storageType = settings.storageModule || "localfilesystem";
+        
+        storage = require("./"+storageType).init(settings);
+        return storage;
+    },
+};
+
+module.exports.__defineGetter__("storage", function() { return storage; });
+

red/storage/localfilesystem.js

@@ -0,0 +1,360 @@
+/**
+ * Copyright 2013 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');
+var util = require('util');
+var fspath = require("path");
+
+var settings;
+var flowsFile;
+var credentialsFile;
+
+var userDir;
+var libDir;
+var libFlowsDir;
+
+// TODO: Make user data directory relocatable
+
+function listFiles(dir) {
+    var dirs = {};
+    var files = [];
+    var dirCount = 0;
+    fs.readdirSync(dir).sort().filter(function(fn) {
+            var stats = fs.lstatSync(dir+"/"+fn);
+            if (stats.isDirectory()) {
+                dirCount += 1;
+                dirs[fn] = listFiles(dir+"/"+fn);
+            } else {
+                files.push(fn.split(".")[0]);
+            }
+    });
+    var result = {};
+    if (dirCount > 0) { result.d = dirs; }
+    if (files.length > 0) { result.f = files; }
+    return 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 scanning = true;
+    var read = 0;
+    var length = 10;
+    var offset = 0;
+    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 offset = 0;
+    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.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;
+}
+
+function writeFile(root,path,meta,body,res) {
+    var fn = fspath.join(root,path);
+    
+    var parts = path.split("/");
+    var dirname = root;
+    for (var i = 0;i<parts.length-1;i+=1) {
+        dirname = fspath.join(dirname,parts[i]);
+        if (!fs.existsSync(dirname)) {
+            fs.mkdirSync(dirname);
+        }
+    }
+    
+    var headers = "";
+    for (var i in meta) {
+        headers += "// "+i+": "+meta[i]+"\n";
+    }
+    fs.writeFile(fn,headers+body,function(err) {
+            //TODO: handle error
+            res.writeHead(204, {'Content-Type': 'text/plain'});
+            res.end();
+    });
+}
+
+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);
+        }
+
+        credentialsFile = fspath.join(userDir,"credentials.json");
+        
+        libDir = fspath.join(userDir,"lib");
+        libFlowsDir = fspath.join(libDir,"flows");
+        
+        if (!fs.existsSync(libDir)) {
+            fs.mkdirSync(libDir);
+        }
+        if (!fs.existsSync(libFlowsDir)) {
+            fs.mkdirSync(libFlowsDir);
+        }
+        return this;
+    },
+    getFlows: function() {
+        var defer = when.defer();
+        fs.exists(flowsFullPath, function(exists) {
+            if (exists) {
+                util.log("[red] Loading flows : "+flowsFile);
+                fs.readFile(flowsFullPath,'utf8',function(err,data) {
+                    if (err) {
+                        defer.reject(err);
+                    } else {
+                        try {
+                            defer.resolve(JSON.parse(data));
+                        } catch(err) {
+                            defer.reject(err);
+                        }
+                    }
+                });
+            } else {
+                util.log("[red] Flows file not found : "+flowsFile   );
+                defer.resolve([]);
+            }
+        });
+        return defer.promise;
+    },
+    saveFlows: function(flows) {
+        var defer = when.defer();
+        fs.writeFile(flowsFullPath, JSON.stringify(flows), function(err) {
+                if(err) {
+                    defer.reject(err);
+                } else {
+                    defer.resolve();
+                }
+        });
+        return defer.promise;
+    },
+    
+    getCredentials: function() {
+        var defer = when.defer();
+        fs.exists(credentialsFile, function(exists) {
+            if (exists) {
+                fs.readFile(credentialsFile,'utf8',function(err,data) {
+                    if (err) {
+                        defer.reject(err);
+                    } else {
+                        try {
+                            defer.resolve(JSON.parse(data));
+                        } catch(err) {
+                            defer.reject(err);
+                        }
+                    }
+                });
+            } else {
+                defer.resolve({});
+            }
+        });
+        return defer.promise;
+    },
+    
+    saveCredentials: function(credentials) {
+        var defer = when.defer();
+        fs.writeFile(credentialsFile, JSON.stringify(credentials), function(err) {
+                if(err) {
+                    defer.reject(err);
+                } else {
+                    defer.resolve();
+                }
+        });
+        return defer.promise;
+    },
+    
+    getAllFlows: function() {
+        var defer = when.defer();
+        defer.resolve(listFiles(libFlowsDir));
+        return defer.promise;
+    },
+    
+    getFlow: function(fn) {
+        var defer = when.defer();
+        
+        var file = fspath.join(libFlowsDir,fn+".json");
+        fs.exists(file, function(exists) {
+            if (exists) {
+                fs.readFile(file,'utf8',function(err,data) {
+                    if (err) {
+                        defer.reject(err);
+                    } else {
+                        defer.resolve(data);
+                    }
+                });
+            } else {
+                defer.reject();
+            }
+        });
+        
+        return defer.promise;
+    },
+    
+    saveFlow: function(fn,data) {
+        var defer = when.defer();
+        var file = fspath.join(libFlowsDir,fn+".json");
+        var parts = file.split("/");
+        for (var i = 0;i<parts.length;i+=1) {
+            var dirname = parts.slice(0,i).join("/");
+            if (dirname != "" ){
+                if (!fs.existsSync(dirname)) {
+                    fs.mkdirSync(dirname);
+                }
+            }
+        }
+        fs.writeFile(file,data,function(err) {
+            if (err) {
+                defer.reject(err);
+            } else {
+                defer.resolve();
+            }
+        });
+        return defer.promise;
+    },
+    
+    getLibraryEntry: function(type,path) {
+        var defer = when.defer();
+        var root = fspath.join(libDir,type);
+        if (!fs.existsSync(root)) {
+            fs.mkdirSync(root);
+        }
+        var rootPath = fspath.join(libDir,type,path);
+        
+        fs.lstat(rootPath,function(err,stats) {
+            if (err) {
+                console.log(err);
+                defer.reject(err);
+            } else if (stats.isFile()) {
+                defer.resolve(getFileBody(root,path));
+            } else {
+                if (path.substr(-1) == '/') {
+                    path = path.substr(0,path.length-1);
+                }
+                fs.readdir(rootPath,function(err,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);
+                            }
+                        }
+                            
+                    });
+                    defer.resolve(dirs.concat(files));
+                });
+            }
+        });
+        return defer.promise;
+    },
+    saveLibraryEntry: function(type,path,meta,body) {
+        var defer = when.defer();
+        
+        var root = fspath.join(libDir,type);
+        if (!fs.existsSync(root)) {
+            fs.mkdirSync(root);
+        }
+        var fn = fspath.join(root,path);
+        var parts = path.split("/");
+        var dirname = root;
+        for (var i=0;i<parts.length-1;i+=1) {
+            dirname = fspath.join(dirname,parts[i]);
+            if (!fs.existsSync(dirname)) {
+                fs.mkdirSync(dirname);
+            }
+        }
+        
+        var headers = "";
+        for (var i in meta) {
+            headers += "// "+i+": "+meta[i]+"\n";
+        }
+        fs.writeFile(fn,headers+body,function(err) {
+            if (err) {
+                defer.reject(err);
+            } else {
+                defer.resolve();
+            }
+        });
+        return defer.promise;
+    }
+};
+
+module.exports = localfilesystem;

settings.js

@@ -16,6 +16,8 @@
 module.exports = {
     uiPort: 1880,
     
+    userDir: "/tmp/a",
+    
     // By default, the Node-RED UI accepts connections on all IPv4 interfaces.
     // The following property can be used to listen on a specific interface. For
     // example, the following would only allow connections from the local machine. 
@@ -28,6 +30,10 @@ module.exports = {
     // The file containing the flows. If not set, it defaults to flows_<hostname>.json
     //flowFile: 'flows.json',
     
+    // By default, all user data is stored in the Node-RED install directory. To
+    // use a different location, the following property can be used
+    //userDir: '/home/nol/.node-red/',
+    
     // You can protect the user interface with a userid and password by using the following property
     // the password must be an md5 hash  eg.. 5f4dcc3b5aa765d61d8327deb882cf99 ('password')
     //httpAuth: {user:"user",pass:"5f4dcc3b5aa765d61d8327deb882cf99"},