FEATURE: Add streaming to composer helper

app/controllers/discourse_ai/ai_helper/assistant_controller.rb

@@ -43,7 +43,7 @@ def suggest
                      prompt,
                      input,
                      current_user,
-                     force_default_locale,
+                     force_default_locale: force_default_locale,
                    ),
                  status: 200
         end
@@ -110,26 +110,44 @@ def suggest_thumbnails(input)
       end
 
       def stream_suggestion
-        post_id = get_post_param!
         text = get_text_param!
-        post = Post.includes(:topic).find_by(id: post_id)
+
+        location = params[:location]
+        raise Discourse::InvalidParameters.new(:location) if !location
+
         prompt = CompletionPrompt.find_by(id: params[:mode])
 
         raise Discourse::InvalidParameters.new(:mode) if !prompt || !prompt.enabled?
-        raise Discourse::InvalidParameters.new(:post_id) unless post
+        return suggest_thumbnails(input) if prompt.id == CompletionPrompt::ILLUSTRATE_POST
 
         if prompt.id == CompletionPrompt::CUSTOM_PROMPT
           raise Discourse::InvalidParameters.new(:custom_prompt) if params[:custom_prompt].blank?
         end
 
-        Jobs.enqueue(
-          :stream_post_helper,
-          post_id: post.id,
-          user_id: current_user.id,
-          text: text,
-          prompt: prompt.name,
-          custom_prompt: params[:custom_prompt],
-        )
+        if location == "composer"
+          Jobs.enqueue(
+            :stream_composer_helper,
+            user_id: current_user.id,
+            text: text,
+            prompt: prompt.name,
+            custom_prompt: params[:custom_prompt],
+            force_default_locale: params[:force_default_locale] || false,
+          )
+        else
+          post_id = get_post_param!
+          post = Post.includes(:topic).find_by(id: post_id)
+
+          raise Discourse::InvalidParameters.new(:post_id) unless post
+
+          Jobs.enqueue(
+            :stream_post_helper,
+            post_id: post.id,
+            user_id: current_user.id,
+            text: text,
+            prompt: prompt.name,
+            custom_prompt: params[:custom_prompt],
+          )
+        end
 
         render json: { success: true }, status: 200
       rescue DiscourseAi::Completions::Endpoints::Base::CompletionFailed

app/jobs/regular/stream_composer_helper.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module Jobs
+  class StreamComposerHelper < ::Jobs::Base
+    sidekiq_options retry: false
+
+    def execute(args)
+      return unless args[:prompt]
+      return unless user = User.find_by(id: args[:user_id])
+      return unless args[:text]
+
+      prompt = CompletionPrompt.enabled_by_name(args[:prompt])
+
+      if prompt.id == CompletionPrompt::CUSTOM_PROMPT
+        prompt.custom_instruction = args[:custom_prompt]
+      end
+
+      DiscourseAi::AiHelper::Assistant.new.stream_prompt(
+        prompt,
+        args[:text],
+        user,
+        "/discourse-ai/ai-helper/stream_composer_suggestion",
+        force_default_locale: args[:force_default_locale],
+      )
+    end
+  end
+end

assets/javascripts/discourse/components/ai-post-helper-menu.gjs

@@ -237,6 +237,7 @@ export default class AiPostHelperMenu extends Component {
     this._activeAiRequest = ajax(fetchUrl, {
       method: "POST",
       data: {
+        location: "post",
         mode: option.id,
         text: this.args.data.selectedText,
         post_id: this.args.data.quoteState.postId,

assets/javascripts/discourse/components/modal/diff-modal.gjs

@@ -1,45 +1,92 @@
 import Component from "@glimmer/component";
 import { tracked } from "@glimmer/tracking";
 import { action } from "@ember/object";
+import didInsert from "@ember/render-modifiers/modifiers/did-insert";
+import willDestroy from "@ember/render-modifiers/modifiers/will-destroy";
 import { service } from "@ember/service";
 import { htmlSafe } from "@ember/template";
 import CookText from "discourse/components/cook-text";
 import DButton from "discourse/components/d-button";
 import DModal from "discourse/components/d-modal";
+import concatClass from "discourse/helpers/concat-class";
 import { ajax } from "discourse/lib/ajax";
 import { popupAjaxError } from "discourse/lib/ajax-error";
+import { bind } from "discourse/lib/decorators";
 import { i18n } from "discourse-i18n";
+import SmoothStreamer from "../../lib/smooth-streamer";
 import AiIndicatorWave from "../ai-indicator-wave";
 
 export default class ModalDiffModal extends Component {
   @service currentUser;
+  @service messageBus;
 
   @tracked loading = false;
   @tracked diff;
   @tracked suggestion = "";
+  @tracked
+  smoothStreamer = new SmoothStreamer(
+    () => this.suggestion,
+    (newValue) => (this.suggestion = newValue)
+  );
 
   constructor() {
     super(...arguments);
     this.suggestChanges();
   }
 
+  @bind
+  subscribe() {
+    const channel = "/discourse-ai/ai-helper/stream_composer_suggestion";
+    this.messageBus.subscribe(channel, this.updateResult);
+  }
+
+  @bind
+  unsubscribe() {
+    const channel = "/discourse-ai/ai-helper/stream_composer_suggestion";
+    this.messageBus.subscribe(channel, this.updateResult);
+  }
+
+  @action
+  async updateResult(result) {
+    if (result) {
+      this.loading = false;
+    }
+    await this.smoothStreamer.updateResult(result, "result");
+
+    if (result.done) {
+      this.diff = result.diff;
+    }
+
+    const mdTablePromptId = this.currentUser?.ai_helper_prompts.find(
+      (prompt) => prompt.name === "markdown_table"
+    ).id;
+
+    // Markdown table prompt looks better with
+    // before/after results than diff
+    // despite having `type: diff`
+    if (this.args.model.mode === mdTablePromptId) {
+      this.diff = null;
+    }
+  }
+
   @action
   async suggestChanges() {
+    this.smoothStreamer.resetStreaming();
+    this.diff = null;
+    this.suggestion = "";
     this.loading = true;
 
     try {
-      const suggestion = await ajax("/discourse-ai/ai-helper/suggest", {
+      return await ajax("/discourse-ai/ai-helper/stream_suggestion", {
         method: "POST",
         data: {
+          location: "composer",
           mode: this.args.model.mode,
           text: this.args.model.selectedText,
           custom_prompt: this.args.model.customPromptValue,
           force_default_locale: true,
         },
       });
-
-      this.diff = suggestion.diff;
-      this.suggestion = suggestion.suggestions[0];
     } catch (e) {
       popupAjaxError(e);
     } finally {
@@ -66,24 +113,42 @@ export default class ModalDiffModal extends Component {
       @closeModal={{@closeModal}}
     >
       <:body>
-        {{#if this.loading}}
-          <div class="composer-ai-helper-modal__loading">
-            <CookText @rawText={{@model.selectedText}} />
-          </div>
-        {{else}}
-          {{#if this.diff}}
-            {{htmlSafe this.diff}}
-          {{else}}
-            <div class="composer-ai-helper-modal__old-value">
-              {{@model.selectedText}}
+        <div {{didInsert this.subscribe}} {{willDestroy this.unsubscribe}}>
+          {{#if this.loading}}
+            <div class="composer-ai-helper-modal__loading">
+              <CookText @rawText={{@model.selectedText}} />
             </div>
-
-            <div class="composer-ai-helper-modal__new-value">
-              {{this.suggestion}}
+          {{else}}
+            <div
+              class={{concatClass
+                "composer-ai-helper-modal__suggestion"
+                "streamable-content"
+                (if this.smoothStreamer.isStreaming "streaming" "")
+              }}
+            >
+              {{#if this.smoothStreamer.isStreaming}}
+                <CookText
+                  @rawText={{this.smoothStreamer.renderedText}}
+                  class="cooked"
+                />
+              {{else}}
+                {{#if this.diff}}
+                  {{htmlSafe this.diff}}
+                {{else}}
+                  <div class="composer-ai-helper-modal__old-value">
+                    {{@model.selectedText}}
+                  </div>
+                  <div class="composer-ai-helper-modal__new-value">
+                    <CookText
+                      @rawText={{this.smoothStreamer.renderedText}}
+                      class="cooked"
+                    />
+                  </div>
+                {{/if}}
+              {{/if}}
             </div>
           {{/if}}
-        {{/if}}
-
+        </div>
       </:body>
 
       <:footer>

assets/javascripts/discourse/components/thumbnail-suggestion-item.gjs

@@ -18,7 +18,7 @@ export default class ThumbnailSuggestionItem extends Component {
       return this.args.removeSelection(thumbnail);
     }
 
-    this.selectIcon = "check-circle";
+    this.selectIcon = "circle-check";
     this.selectLabel = "discourse_ai.ai_helper.thumbnail_suggestions.selected";
     this.selected = true;
     return this.args.addSelection(thumbnail);

lib/ai_helper/assistant.rb

@@ -85,7 +85,7 @@ def custom_locale_instructions(user = nil, force_default_locale)
         end
       end
 
-      def localize_prompt!(prompt, user = nil, force_default_locale = false)
+      def localize_prompt!(prompt, user = nil, force_default_locale: false)
         locale_instructions = custom_locale_instructions(user, force_default_locale)
         if locale_instructions
           prompt.messages[0][:content] = prompt.messages[0][:content] + locale_instructions
@@ -128,10 +128,10 @@ def localize_prompt!(prompt, user = nil, force_default_locale = false)
         end
       end
 
-      def generate_prompt(completion_prompt, input, user, force_default_locale = false, &block)
+      def generate_prompt(completion_prompt, input, user, force_default_locale: false, &block)
         llm = helper_llm
         prompt = completion_prompt.messages_with_input(input)
-        localize_prompt!(prompt, user, force_default_locale)
+        localize_prompt!(prompt, user, force_default_locale: force_default_locale)
 
         llm.generate(
           prompt,
@@ -143,8 +143,14 @@ def generate_prompt(completion_prompt, input, user, force_default_locale = false
         )
       end
 
-      def generate_and_send_prompt(completion_prompt, input, user, force_default_locale = false)
-        completion_result = generate_prompt(completion_prompt, input, user, force_default_locale)
+      def generate_and_send_prompt(completion_prompt, input, user, force_default_locale: false)
+        completion_result =
+          generate_prompt(
+            completion_prompt,
+            input,
+            user,
+            force_default_locale: force_default_locale,
+          )
         result = { type: completion_prompt.prompt_type }
 
         result[:suggestions] = (
@@ -160,24 +166,37 @@ def generate_and_send_prompt(completion_prompt, input, user, force_default_local
         result
       end
 
-      def stream_prompt(completion_prompt, input, user, channel)
+      def stream_prompt(completion_prompt, input, user, channel, force_default_locale: false)
+        streamed_diff = +""
         streamed_result = +""
         start = Time.now
 
-        generate_prompt(completion_prompt, input, user) do |partial_response, cancel_function|
+        generate_prompt(
+          completion_prompt,
+          input,
+          user,
+          force_default_locale: force_default_locale,
+        ) do |partial_response, cancel_function|
           streamed_result << partial_response
 
-          # Throttle the updates
-          if (Time.now - start > 0.5) || Rails.env.test?
-            payload = { result: sanitize_result(streamed_result), done: false }
+          streamed_diff = parse_diff(input, partial_response) if completion_prompt.diff?
+
+          # Throttle the updates and
+          # checking length prevents partial tags
+          # that aren't sanitized correctly yet (i.e. '<output')
+          #  from being sent in the stream
+          if (streamed_result.length > 10 && (Time.now - start > 0.3)) || Rails.env.test?
+            payload = { result: sanitize_result(streamed_result), diff: streamed_diff, done: false }
             publish_update(channel, payload, user)
             start = Time.now
           end
         end
 
+        final_diff = parse_diff(input, streamed_result) if completion_prompt.diff?
+
         sanitized_result = sanitize_result(streamed_result)
         if sanitized_result.present?
-          publish_update(channel, { result: sanitized_result, done: true }, user)
+          publish_update(channel, { result: sanitized_result, diff: final_diff, done: true }, user)
         end
       end