Fix race condition on saving config

red/nodes/index.js

@@ -118,6 +118,7 @@ module.exports = {
     getNodeConfigs: registry.getNodeConfigs,
     getNodeConfig: registry.getNodeConfig,
     clearRegistry: registry.clear,
+    cleanNodeList: registry.cleanNodeList,
     
     // Flow handling
     loadFlows: flows.load,

red/nodes/registry.js

@@ -69,7 +69,11 @@ var registry = (function() {
                 nodeList[i] = n;
             }
         }
-        settings.set("nodes",nodeList);
+        if (settings.available()) {
+            return settings.set("nodes",nodeList);
+        } else {
+            return when.reject("Settings unavailable");
+        }
     }
     
     return {
@@ -271,7 +275,22 @@ var registry = (function() {
             return filterNodeInfo(config);
         },
         
-        saveNodeList: saveNodeList
+        saveNodeList: saveNodeList,
+        
+        cleanNodeList: function() {
+            var removed = false;
+            for (var id in nodeConfigs) {
+                if (nodeConfigs.hasOwnProperty(id)) {
+                    if (nodeConfigs[id].module && !nodeModules[nodeConfigs[id].module]) {
+                        registry.removeNode(id);
+                        removed = true;
+                    }
+                }
+            }
+            if (removed) {
+                saveNodeList();
+            }
+        }
     }
 })();
 
@@ -547,10 +566,12 @@ function load(defaultNodesDir,disableNodePathScan) {
         when.settle(promises).then(function(results) {
             // Trigger a load of the configs to get it precached
             registry.getAllNodeConfigs();
+            
             if (settings.available()) {
-                registry.saveNodeList();
+                resolve(registry.saveNodeList());
-            }
+            } else {
                 resolve();
+            }
         }); 
     });
 }
@@ -608,12 +629,13 @@ function loadNodeList(nodes) {
     });
     
     return when.settle(promises).then(function(results) {
-        registry.saveNodeList();
+        return registry.saveNodeList().then(function() {
             var list = results.map(function(r) {
                 return filterNodeInfo(r.value);
             });
             return list;
         });
+    });
 }
 
 function addNode(file) {
@@ -666,5 +688,6 @@ module.exports = {
     disableNode: registry.disableNodeSet,
     
     addModule: addModule,
-    removeModule: registry.removeModule
+    removeModule: registry.removeModule,
+    cleanNodeList: registry.cleanNodeList
 }

red/server.js

@@ -330,7 +330,8 @@ function start() {
                     var promises = [];
                     for (i in missingModules) {
                         if (missingModules.hasOwnProperty(i)) {
-                            util.log(" - "+i+": "+missingModules[i].join(", "));
+                            util.log("[red] - "+i+": "+missingModules[i].join(", "));
+                            if (settings.autoInstallModules) {
                                 installModule(i).otherwise(function(err) {
                                     // Error already reported. Need the otherwise handler
                                     // to stop the error propagating any further
@@ -338,6 +339,11 @@ function start() {
                             }
                         }
                     }
+                    if (!settings.autoInstallModules) {
+                        util.log("[red] Removing modules from config");
+                        redNodes.cleanNodeList();
+                    }
+                }
                 defer.resolve();
                 
                 redNodes.loadFlows();

red/storage/localfilesystem.js

@@ -216,7 +216,12 @@ var localfilesystem = {
         if (fs.existsSync(globalSettingsFile)) {
             return nodeFn.call(fs.readFile,globalSettingsFile,'utf8').then(function(data) {
                 if (data) {
+                    try {
                         return JSON.parse(data);
+                    } catch(err) {
+                        util.log("[red] Corrupted config detected - resetting");
+                        return {};
+                    }
                 } else {
                     return {};
                 }

test/red/nodes/registry_spec.js

@@ -17,6 +17,7 @@
 var should = require("should");
 var sinon = require("sinon");
 var path = require("path");
+var when = require("when");
 
 var RedNodes = require("../../../red/nodes");
 var RedNode = require("../../../red/nodes/Node");
@@ -33,7 +34,7 @@ describe('NodeRegistry', function() {
     
     function stubSettings(s,available) {
         s.available =  function() {return available;}
-        s.set = function(s,v) {},
+        s.set = function(s,v) { return when.resolve()},
         s.get = function(s) { return null;}
         return s
     }
@@ -294,7 +295,7 @@ describe('NodeRegistry', function() {
         var settings = {
             nodesDir:[resourcesDir + "TestNode1",resourcesDir + "TestNode2",resourcesDir + "TestNode3"],
             available: function() { return true; },
-            set: function(s,v) {},
+            set: function(s,v) {return when.resolve();},
             get: function(s) { return null;}
         }
         var settingsSave = sinon.spy(settings,"set");
@@ -327,7 +328,7 @@ describe('NodeRegistry', function() {
     it('allows nodes to be added by filename', function(done) {
         var settings = {
             available: function() { return true; },
-            set: function(s,v) {},
+            set: function(s,v) {return when.resolve();},
             get: function(s) { return null;}
         }            
         typeRegistry.init(settings);