Add config debugging helper

src/service/Config.ts

@@ -1,17 +1,41 @@
-import {Singleton} from "@extollo/di";
+import {Singleton, Inject} from "@extollo/di";
 import {CanonicalRecursive} from "./CanonicalRecursive";
+import {Logging} from "./Logging";
 
 @Singleton()
 export class Config extends CanonicalRecursive {
+    @Inject()
+    protected readonly logging!: Logging
+
     protected appPath: string[] = ['configs']
     protected suffix: string = '.config.js'
     protected canonicalItem: string = 'config'
+    protected recordConfigAccesses: boolean = false
+    protected accessedKeys: string[] = []
 
     public async up() {
         await super.up()
 
         if ( this.get('server.debug', false) ) {
             Error.stackTraceLimit = Infinity
+            this.recordConfigAccesses = true
         }
     }
+
+    public async down() {
+        await super.down()
+
+        if ( this.recordConfigAccesses && this.accessedKeys.length ) {
+            this.logging.debug(`The following configuration keys were accessed while this application was online:`)
+            this.accessedKeys.forEach(key => this.logging.debug(`    - ${key}`))
+        }
+    }
+
+    public get(key: string, fallback?: any): any {
+        if ( this.recordConfigAccesses && !this.accessedKeys.includes(key) ) {
+            this.accessedKeys.push(key)
+        }
+
+        return super.get(key, fallback);
+    }
 }