dev: better log support for extensions

src/backend/src/Extension.js

@@ -40,7 +40,20 @@ class Extension extends AdvancedBase {
     constructor (...a) {
         super(...a);
         this.service = null;
+        this.log = null;
         this.ensure_service_();
+        
+        this.log = (...a) => {
+            this.log_context.info(a.join(' '));
+        };
+        this.LOG = (...a) => {
+            this.log_context.noticeme(a.join(' '));
+        };
+        ['info','warn','debug','error','tick','noticeme','system'].forEach(lvl => {
+            this.log[lvl] = (...a) => {
+                this.log_context[lvl](...a);
+            }
+        });
     }
 
     example () {
@@ -72,6 +85,17 @@ class Extension extends AdvancedBase {
         return services;
     }
 
+    get log_context () {
+        const log_context = this.service.values.get('log_context');
+        if ( ! log_context ) {
+            throw new Error(
+                'extension tried to access "log_context" before it was ' +
+                'initialized'
+            );
+        }
+        return log_context;
+    }
+
     /**
      * This will create a GET endpoint on the default service.
      * @param {*} path - route for the endpoint

src/backend/src/ExtensionModule.js

@@ -25,6 +25,7 @@ class ExtensionModule extends AdvancedBase {
     async install (context) {
         const services = context.get('services');
         
+        this.extension.name = context.name;
         this.extension.emit('install', { context, services })
 
         if ( this.extension.service ) {

src/backend/src/ExtensionService.js

@@ -82,6 +82,8 @@ class ExtensionService extends BaseService {
         this.state = args.state;
         
         this.state.values.set('services', this.services);
+        this.state.values.set('log_context', this.services.get('log-service').create(
+            this.state.extension.name));
 
         // Create database access object for extension
         const db = this.services.get('database').get(DB_WRITE, 'extension');