refactor: Add Debugging for Failed Notifications

Added debugging statements for failed notifications. Also clarified that notification errors should not be passed on to Express for error handling, since the mutation that triggered the notification was already successful.

lib/debug.js

@@ -15,3 +15,4 @@ exports.accounts = debug('solid:accounts')
 exports.email = debug('solid:email')
 exports.ldp = debug('solid:ldp')
 exports.fs = debug('solid:fs')
+exports.prep = debug('solid:prep')

lib/handlers/notify.js

@@ -4,6 +4,7 @@ const libPath = require('path/posix')
 
 const headerTemplate = require('express-prep/templates').header
 const solidRDFTemplate = require('../rdf-notification-template')
+const debug = require('../debug').prep
 
 const ALLOWED_RDF_MIME_TYPES = [
   'application/ld+json',
@@ -82,17 +83,21 @@ function handler (req, res, next) {
         }
       })
     } catch (error) {
-      // Failed notification message
+      debug(`Failed to trigger notification on route ${fullUrl}`)
+      // No special handling is necessary since the resource mutation was
+      // already successful. The purpose of this block is to prevent Express
+      // from triggering error handling middleware when notifications fail.
+      // An error notification might be sent in the future.
     }
   }
 
   // Write a notification to parent container
   // POST in Solid creates a child resource
   const parent = getParent(path)
   if (parent && method !== 'POST') {
+    const parentID = res.setEventID(parent)
+    const parentUrl = new URL(parent, fullUrl)
     try {
-      const parentID = res.setEventID(parent)
-      const parentUrl = new URL(parent, fullUrl)
       trigger({
         path: parent,
         generateNotification (
@@ -115,7 +120,11 @@ function handler (req, res, next) {
         }
       })
     } catch (error) {
-      // Failed notification message
+      debug(`Failed to trigger notification on parent route ${parentUrl}`)
+      // No special handling is necessary since the resource mutation was
+      // already successful. The purpose of this block is to prevent Express
+      // from triggering error handling middleware when notifications fail.
+      // An error notification might be sent in the future.
     }
   }