🧹fix: Handle Abort Message Edge Cases (#1462)

* chore: bump langchain to v0.0.213 from v0.0.186

* fix: handle abort edge cases:
- abort message server-side if response experienced error mid-generation
- attempt to recover message if aborting resulted in error
- if abortKey is not provided, use conversationId if it exists
- if headers were already sent, send an Event stream message
- issue warning for possible Google censor/filter

refactor(streamResponse): for `sendError`, allow passing overrides so that error can include partial generation, improve typing for `sendMessage`

* chore(MessageContent): remove eslint warning for unused `i`, rephrase unfinished message text

* fix(useSSE): avoid invoking cancelHandler if the abort response was 404

* chore(TMessage): remove unnecessary, unused legacy message property `submitting`

* chore(TMessage): remove unnecessary legacy message property `cancelled`

* chore(abortMiddleware): remove unused `errorText` property to avoid confusion

client/src/hooks/useSSE.ts

@@ -64,7 +64,6 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
           messageId: message?.overrideParentMessageId + '_',
           plugin: plugin ?? null,
           plugins: plugins ?? [],
-          submitting: true,
           // unfinished: true
         },
       ]);
@@ -79,7 +78,6 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
           messageId: message?.messageId + '_',
           plugin: plugin ?? null,
           plugins: plugins ?? [],
-          submitting: true,
           // unfinished: true
         },
       ]);
@@ -136,7 +134,6 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
           ...initialResponse,
           parentMessageId: message?.overrideParentMessageId ?? null,
           messageId: message?.overrideParentMessageId + '_',
-          submitting: true,
         },
       ]);
     } else {
@@ -147,7 +144,6 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
           ...initialResponse,
           parentMessageId: message?.messageId,
           messageId: message?.messageId + '_',
-          submitting: true,
         },
       ]);
     }
@@ -238,6 +234,7 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
   const abortConversation = (conversationId = '', submission: TSubmission) => {
     console.log(submission);
     const { endpoint } = submission?.conversation || {};
+    let res: Response;
 
     fetch(`/api/ask/${endpoint}/abort`, {
       method: 'POST',
@@ -249,9 +246,15 @@ export default function useSSE(submission: TSubmission | null, index = 0) {
         abortKey: conversationId,
       }),
     })
-      .then((response) => response.json())
+      .then((response) => {
+        res = response;
+        return response.json();
+      })
       .then((data) => {
         console.log('aborted', data);
+        if (res.status === 404) {
+          return setIsSubmitting(false);
+        }
         cancelHandler(data, submission);
       })
       .catch((error) => {