Update runtime apis to support multiple libraries

packages/node_modules/@node-red/runtime/lib/library/examples.js

@@ -0,0 +1,101 @@
+/**
+ * Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * 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 runtime;
+
+function init(_runtime) {
+    runtime = _runtime;
+}
+
+function getEntry(type,path) {
+    var examples = runtime.nodes.getNodeExampleFlows();
+    var result = [];
+    if (path === "") {
+        return Promise.resolve(Object.keys(examples));
+    } else {
+        path = path.replace(/\/$/,"");
+        var parts = path.split("/");
+        var module = parts.shift();
+        if (module[0] === "@") {
+            module = module+"/"+parts.shift();
+        }
+        if (examples.hasOwnProperty(module)) {
+            examples = examples[module];
+            examples = parts.reduce(function(ex,k) {
+                if (ex) {
+                    if (ex.d && ex.d[k]) {
+                        return ex.d[k]
+                    }
+                    if (ex.f && ex.f.indexOf(k) > -1) {
+                        return runtime.nodes.getNodeExampleFlowPath(module,parts.join("/"));
+                    }
+                } else {
+                    return null;
+                }
+            },examples);
+
+            if (!examples) {
+                return new Promise(function (resolve,reject) {
+                    var error = new Error("not_found");
+                    error.code = "not_found";
+                    return reject(error);
+                });
+            } else if (typeof examples === 'string') {
+                return new Promise(function(resolve,reject) {
+                    try {
+                        fs.readFile(examples,'utf8',function(err, data) {
+                            runtime.log.audit({event: "library.get",library:"_examples",type:"flow",path:path});
+                            if (err) {
+                                return reject(err);
+                            }
+                            return resolve(data);
+                        })
+                    } catch(err) {
+                        return reject(err);
+                    }
+                });
+            } else {
+                if (examples.d) {
+                    for (var d in examples.d) {
+                        if (examples.d.hasOwnProperty(d)) {
+                            result.push(d);
+                        }
+                    }
+                }
+                if (examples.f) {
+                    examples.f.forEach(function(f) {
+                        result.push({fn:f})
+                    })
+                }
+                return Promise.resolve(result);
+            }
+        } else {
+            return new Promise(function (resolve,reject) {
+                var error = new Error("not_found");
+                error.code = "not_found";
+                return reject(error);
+            });
+        }
+    }
+}
+
+module.exports = {
+    name: '_examples_',
+    init: init,
+    getEntry: getEntry
+}