Allow node modules to include example flows

editor/js/main.js

@@ -142,6 +142,8 @@ var RED = (function() {
                             RED.notify(RED._("palette.event.nodeDisabled", {count:msg.types.length})+typeList,"success");
                         }
                     }
+                    // Refresh flow library to ensure any examples are updated
+                    RED.library.loadFlowLibrary();
                 });
             }
         });

editor/js/ui/library.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2013, 2015 IBM Corp.
+ * Copyright 2013, 2016 IBM Corp.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,7 +27,9 @@ RED.library = (function() {
                 var li;
                 var a;
                 var ul = document.createElement("ul");
+                if (root === "") {
                     ul.id = "menu-item-import-library-submenu";
+                }
                 ul.className = "dropdown-menu";
                 if (data.d) {
                     for (i in data.d) {
@@ -63,7 +65,17 @@ RED.library = (function() {
                 }
                 return ul;
             };
+            var examples;
+            if (data.d && data.d._examples_) {
+                examples = data.d._examples_;
+                delete data.d._examples_;
+            }
             var menu = buildMenu(data,"");
+            $("#menu-item-import-examples").remove();
+            if (examples) {
+                RED.menu.addItem("menu-item-import",{id:"menu-item-import-examples",label:RED._("menu.label.examples"),options:[]})
+                $("#menu-item-import-examples-submenu").replaceWith(buildMenu(examples,"_examples_"));
+            }
             //TODO: need an api in RED.menu for this
             $("#menu-item-import-library-submenu").replaceWith(menu);
         });

red/api/library.js

@@ -13,6 +13,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  **/
+var fs = require('fs');
+var fspath = require('path');
+var when = require('when');
 
 var redApp = null;
 var storage;
@@ -68,21 +71,110 @@ function createLibrary(type) {
         });
     }
 }
+
+var exampleRoots = {};
+var exampleFlows = {d:{}};
+var exampleCount = 0;
+
+function getFlowsFromPath(path) {
+    return when.promise(function(resolve,reject) {
+        var result = {};
+        fs.readdir(path,function(err,files) {
+            var promises = [];
+            var validFiles = [];
+            files.forEach(function(file) {
+                var fullPath = fspath.join(path,file);
+                var stats = fs.lstatSync(fullPath);
+                if (stats.isDirectory()) {
+                    validFiles.push(file);
+                    promises.push(getFlowsFromPath(fullPath));
+                } else if (/\.json$/.test(file)){
+                    validFiles.push(file);
+                    exampleCount++;
+                    promises.push(when.resolve(file.split(".")[0]))
+                }
+            })
+            var i=0;
+            when.all(promises).then(function(results) {
+                results.forEach(function(r) {
+                    if (typeof r === 'string') {
+                        result.f = result.f||[];
+                        result.f.push(r);
+                    } else {
+                        result.d = result.d||{};
+                        result.d[validFiles[i]] = r;
+                    }
+                    i++;
+                })
+
+                resolve(result);
+            })
+        });
+    })
+}
+
+function addNodeExamplesDir(module) {
+    exampleRoots[module.name] = module.path;
+    getFlowsFromPath(module.path).then(function(result) {
+        exampleFlows.d[module.name] = result;
+    });
+}
+function removeNodeExamplesDir(module) {
+    delete exampleRoots[module];
+    delete exampleFlows.d[module];
+}
+
 module.exports = {
     init: function(app,runtime) {
         redApp = app;
         log = runtime.log;
         storage = runtime.storage;
+        // TODO: this allows init to be called multiple times without
+        //       registering multiple instances of the listener.
+        //       It isn't.... ideal.
+        runtime.events.removeListener("node-examples-dir",addNodeExamplesDir);
+        runtime.events.on("node-examples-dir",addNodeExamplesDir);
+        runtime.events.removeListener("node-module-uninstalled",removeNodeExamplesDir);
+        runtime.events.on("node-module-uninstalled",removeNodeExamplesDir);
+
     },
     register: createLibrary,
 
     getAll: function(req,res) {
         storage.getAllFlows().then(function(flows) {
             log.audit({event: "library.get.all",type:"flow"},req);
+            if (exampleCount > 0) {
+                flows.d = flows.d||{};
+                flows.d._examples_ = exampleFlows;
+            }
             res.json(flows);
         });
     },
     get: function(req,res) {
+        if (req.params[0].indexOf("_examples_/") === 0) {
+            var m = /^_examples_\/([^\/]+)\/(.*)$/.exec(req.params[0]);
+            if (m) {
+                var module = m[1];
+                var path = m[2]+".json";
+                if (exampleRoots[module]) {
+                    var fullPath = fspath.join(exampleRoots[module],path);
+                    try {
+                        fs.statSync(fullPath);
+                        log.audit({event: "library.get",type:"flow",path:req.params[0]},req);
+                        return res.sendFile(fullPath,{
+                            headers:{
+                                'Content-Type': 'application/json'
+                            }
+                        })
+                    } catch(err) {
+                        console.log(err);
+                    }
+                }
+            }
+            // IF we get here, we didn't find the file
+            log.audit({event: "library.get",type:"flow",path:req.params[0],error:"not_found"},req);
+            return res.status(404).end();
+        } else {
             storage.getFlow(req.params[0]).then(function(data) {
                 // data is already a JSON string
                 log.audit({event: "library.get",type:"flow",path:req.params[0]},req);
@@ -100,8 +192,14 @@ module.exports = {
                 log.audit({event: "library.get",type:"flow",path:req.params[0],error:"not_found"},req);
                 res.status(404).end();
             });
+        }
     },
     post: function(req,res) {
+        // if (req.params[0].indexOf("_examples_/") === 0) {
+        //     log.warn(log._("api.library.error-save-flow",{path:req.params[0],message:"forbidden"}));
+        //     log.audit({event: "library.set",type:"flow",path:req.params[0],error:"forbidden"},req);
+        //     return res.status(403).send({error:"unexpected_error", message:"forbidden"});
+        // }
         var flow = JSON.stringify(req.body);
         storage.saveFlow(req.params[0],flow).then(function() {
             log.audit({event: "library.set",type:"flow",path:req.params[0]},req);

red/api/locales/en-US/editor.json

@@ -31,6 +31,7 @@
             "export": "Export",
             "clipboard": "Clipboard",
             "library": "Library",
+            "examples": "Examples",
             "subflows": "Subflows",
             "createSubflow": "Create Subflow",
             "selectionToSubflow": "Selection to Subflow",

red/runtime/nodes/registry/installer.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2015 IBM Corp.
+ * Copyright 2015, 2016 IBM Corp.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -174,6 +174,8 @@ function uninstallModule(module) {
                 } else {
                     log.info(log._("server.install.uninstalled",{name:module}));
                     reportRemovedModules(list);
+                    // TODO: tidy up internal event names
+                    events.emit("node-module-uninstalled",module)
                     resolve(list);
                 }
             }

red/runtime/nodes/registry/localfilesystem.js

@@ -184,6 +184,12 @@ function getModuleNodeFiles(module) {
             }
         }
     }
+    var examplesDir = path.join(moduleDir,"examples");
+    try {
+        fs.statSync(examplesDir)
+        events.emit("node-examples-dir",{name:pkg.name,path:examplesDir});
+    } catch(err) {
+    }
     return results;
 }
 

test/red/api/library_spec.js

@@ -80,6 +80,10 @@ describe("library api", function() {
                     libraryEntries[type][path] = body;
                     return when.resolve();
                 }
+            },
+            events: {
+                on: function(){},
+                removeListener: function(){}
             }
         });
     }