chore(modernize): Admin MetricsController

lib/routes/admin-api/index.js

@@ -5,7 +5,7 @@ const FeatureController = require('./feature.js');
 const ArchiveController = require('./archive.js');
 const EventController = require('./event.js');
 const strategies = require('./strategy');
-const metrics = require('./metrics');
+const MetricsController = require('./metrics');
 const UserController = require('./user');
 const apiDef = require('./api-def.json');
 
@@ -20,7 +20,7 @@ class AdminApi extends Controller {
         this.app.use('/archive', new ArchiveController(stores).router);
         this.app.use('/strategies', strategies.router(config));
         this.app.use('/events', new EventController(stores).router);
-        this.app.use('/metrics', metrics.router(config));
+        this.app.use('/metrics', new MetricsController(stores).router);
         this.app.use('/user', new UserController().router);
     }
 

lib/routes/admin-api/metrics.js

@@ -1,138 +1,142 @@
 'use strict';
 
-const { Router } = require('express');
-
+const Controller = require('../controller');
 const logger = require('../../logger')('/admin-api/metrics.js');
 const ClientMetrics = require('../../client-metrics');
 
-const catchLogAndSendErrorResponse = (err, res) => {
-    logger.error(err);
-    res.status(500).end();
-};
-
-exports.router = function(config) {
-    const {
+class MetricsController extends Controller {
+    constructor({
         clientMetricsStore,
         clientInstanceStore,
         clientApplicationsStore,
         strategyStore,
         featureToggleStore,
-    } = config.stores;
+    }) {
+        super();
+        this.metrics = new ClientMetrics(clientMetricsStore);
+        this.clientInstanceStore = clientInstanceStore;
+        this.clientApplicationsStore = clientApplicationsStore;
+        this.strategyStore = strategyStore;
+        this.featureToggleStore = featureToggleStore;
 
-    const metrics = new ClientMetrics(clientMetricsStore);
-    const router = Router();
+        this.get('/seen-toggles', this.getSeenToggles);
+        this.get('/seen-apps', this.getSeenApps);
+        this.get('/feature-toggles', this.getFeatureToggles);
+        this.get('/feature-toggles/:name', this.getFeatureToggle);
+        this.post('/applications/:appName', this.createApplication);
+        this.get('/applications/', this.getApplications);
+        this.get('/applications/:appName', this.getApplication);
+    }
 
-    router.get('/seen-toggles', (req, res) => {
-        const seenAppToggles = metrics.getAppsWithToggles();
+    getSeenToggles(req, res) {
+        const seenAppToggles = this.metrics.getAppsWithToggles();
         res.json(seenAppToggles);
-    });
+    }
 
-    router.get('/seen-apps', (req, res) => {
-        const seenApps = metrics.getSeenAppsPerToggle();
-        clientApplicationsStore
-            .getApplications()
-            .then(toLookup)
-            .then(metaData => {
-                Object.keys(seenApps).forEach(key => {
-                    seenApps[key] = seenApps[key].map(entry => {
-                        if (metaData[entry.appName]) {
-                            return Object.assign(
-                                {},
-                                entry,
-                                metaData[entry.appName]
-                            );
-                        }
-                        return entry;
-                    });
-                });
-                res.json(seenApps);
+    async getSeenApps(req, res) {
+        const seenApps = this.metrics.getSeenAppsPerToggle();
+        const applications = await this.clientApplicationsStore.getApplications();
+        const metaData = applications.reduce((result, entry) => {
+            result[entry.appName] = entry;
+            return result;
+        }, {});
+
+        Object.keys(seenApps).forEach(key => {
+            seenApps[key] = seenApps[key].map(entry => {
+                if (metaData[entry.appName]) {
+                    return Object.assign({}, entry, metaData[entry.appName]);
+                }
+                return entry;
             });
-    });
+        });
+        res.json(seenApps);
+    }
 
-    router.get('/feature-toggles', (req, res) => {
-        res.json(metrics.getTogglesMetrics());
-    });
+    getFeatureToggles(req, res) {
+        res.json(this.metrics.getTogglesMetrics());
+    }
 
-    router.get('/feature-toggles/:name', (req, res) => {
+    getFeatureToggle(req, res) {
         const name = req.params.name;
-        const data = metrics.getTogglesMetrics();
+        const data = this.metrics.getTogglesMetrics();
         const lastHour = data.lastHour[name] || {};
         const lastMinute = data.lastMinute[name] || {};
         res.json({
             lastHour,
             lastMinute,
         });
-    });
+    }
 
-    router.post('/applications/:appName', (req, res) => {
+    // Todo: add joi-schema validation
+    async createApplication(req, res) {
         const input = Object.assign({}, req.body, {
             appName: req.params.appName,
         });
-        clientApplicationsStore
-            .upsert(input)
-            .then(() => res.status(202).end())
-            .catch(err => catchLogAndSendErrorResponse(err, res));
-    });
 
-    function toLookup(metaData) {
-        return metaData.reduce((result, entry) => {
-            result[entry.appName] = entry;
-            return result;
-        }, {});
+        try {
+            await this.clientApplicationsStore.upsert(input);
+            res.status(202).end();
+        } catch (err) {
+            logger.error(err);
+            res.status(500).end();
+        }
     }
 
-    router.get('/applications/', (req, res) => {
-        clientApplicationsStore
-            .getApplications(req.query)
-            .then(applications => res.json({ applications }))
-            .catch(err => catchLogAndSendErrorResponse(err, res));
-    });
+    async getApplications(req, res) {
+        try {
+            const applications = await this.clientApplicationsStore.getApplications(
+                req.query
+            );
+            res.json({ applications });
+        } catch (err) {
+            logger.error(err);
+            res.status(500).end();
+        }
+    }
 
-    router.get('/applications/:appName', (req, res) => {
+    async getApplication(req, res) {
         const appName = req.params.appName;
-        const seenToggles = metrics.getSeenTogglesByAppName(appName);
+        const seenToggles = this.metrics.getSeenTogglesByAppName(appName);
 
-        Promise.all([
-            clientApplicationsStore.getApplication(appName),
-            clientInstanceStore.getByAppName(appName),
-            strategyStore.getStrategies(),
-            featureToggleStore.getFeatures(),
-        ])
-            .then(([application, instances, strategies, features]) => {
-                const appDetails = {
-                    appName: application.appName,
-                    createdAt: application.createdAt,
-                    description: application.description,
-                    url: application.url,
-                    color: application.color,
-                    icon: application.icon,
-                    strategies: application.strategies.map(name => {
-                        const found = strategies.find(
-                            feature => feature.name === name
-                        );
-                        if (found) {
-                            return found;
-                        }
-                        return { name, notFound: true };
-                    }),
-                    instances,
-                    seenToggles: seenToggles.map(name => {
-                        const found = features.find(
-                            feature => feature.name === name
-                        );
-                        if (found) {
-                            return found;
-                        }
-                        return { name, notFound: true };
-                    }),
-                    links: {
-                        self: `/api/applications/${application.appName}`,
-                    },
-                };
-                res.json(appDetails);
-            })
-            .catch(err => catchLogAndSendErrorResponse(err, res));
-    });
+        try {
+            const [
+                application,
+                instances,
+                strategies,
+                features,
+            ] = await Promise.all([
+                this.clientApplicationsStore.getApplication(appName),
+                this.clientInstanceStore.getByAppName(appName),
+                this.strategyStore.getStrategies(),
+                this.featureToggleStore.getFeatures(),
+            ]);
 
-    return router;
-};
+            const appDetails = {
+                appName: application.appName,
+                createdAt: application.createdAt,
+                description: application.description,
+                url: application.url,
+                color: application.color,
+                icon: application.icon,
+                strategies: application.strategies.map(name => {
+                    const found = strategies.find(f => f.name === name);
+                    return found ? found : { name, notFound: true };
+                }),
+                instances,
+                seenToggles: seenToggles.map(name => {
+                    const found = features.find(f => f.name === name);
+                    return found ? found : { name, notFound: true };
+                }),
+                links: {
+                    self: `/api/applications/${application.appName}`,
+                },
+            };
+            res.json(appDetails);
+        } catch (err) {
+            logger.error(err);
+            res.status(500).end();
+        }
+    }
+}
+
+module.exports = MetricsController;