Start basic CLI framework

lib/src/lifecycle/Application.ts

@@ -68,7 +68,16 @@ export default class Application {
      * @return Promise<void>
      */
     async down() {
+        this.logger.info('Stopping Daton...', true)
+        for ( const unit of this.instantiated_units ) {
+            if ( !unit ) continue
+            await this.stop_unit(unit)
+        }
 
+        setTimeout(() => {
+            this.logger.warn(`Force exiting...`)
+            Deno.exit()
+        }, 2000)
     }
 
     /**
@@ -106,8 +115,25 @@ export default class Application {
         } catch (e) {
             unit.status = Status.Error
             this.logger.error(`Error encountered while starting ${unit.constructor.name}. Will attempt to proceed.`)
-            this.logger.debug(e.message)
-            this.logger.verbose(e)
+            this.logger.debug(e)
+        }
+    }
+
+    /**
+     * Shut down the given lifecycle unit.
+     * @param {LifecycleUnit} unit
+     */
+    protected async stop_unit(unit: LifecycleUnit) {
+        try {
+            unit.status = Status.Stopping
+            this.logger.info(`Stopping ${unit.constructor.name}...`)
+            await unit.down()
+            this.logger.verbose(`Successfully stopped ${unit.constructor.name}`)
+            unit.status = Status.Stopped
+        } catch (e) {
+            unit.status = Status.Error
+            this.logger.error(`Error encountered while stopping ${unit.constructor.name}. Will attempt to proceed.`)
+            this.logger.debug(e)
         }
     }