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<h1><a href="../../../index.html">All files</a> / <a href="index.html">ui/chat/services</a> MessageAlternativeService.ts</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">87.17% </span>
<span class="quiet">Statements</span>
<span class='fraction'>68/78</span>
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<div class='fl pad1y space-right2'>
<span class="strong">75.86% </span>
<span class="quiet">Branches</span>
<span class='fraction'>22/29</span>
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<div class='fl pad1y space-right2'>
<span class="strong">83.33% </span>
<span class="quiet">Functions</span>
<span class='fraction'>5/6</span>
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<div class='fl pad1y space-right2'>
<span class="strong">88.88% </span>
<span class="quiet">Lines</span>
<span class='fraction'>64/72</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Location: /src/ui/chat/services/MessageAlternativeService.ts
*
* Purpose: Handles creation of alternative AI responses for message branching
* Extracted from MessageManager.ts to follow Single Responsibility Principle
*
* Flow:
* 1. Save the original content as a branch (preserving old response)
* 2. Clear the current message content and set loading state
* 3. Fire UI update so the user sees a cleared message with loading indicator
* 4. Stream the new response directly into the live conversation message
* 5. On complete: update message, fire final events
* 6. On abort: keep partial content (original is safe in the branch)
* 7. Branch arrows allow navigation between original (branch) and new (current)
*
* Used by: MessageManager for retry and alternative response generation
* Dependencies: ChatService, BranchManager, MessageStreamHandler
*/
import { ChatService } from '../../../services/chat/ChatService';
import { ConversationData, ConversationMessage } from '../../../types/chat/ChatTypes';
import { BranchManager } from './BranchManager';
import { MessageStreamHandler } from './MessageStreamHandler';
import { AbortHandler } from '../utils/AbortHandler';
import { filterCompletedToolCalls } from '../utils/toolCallUtils';
export interface MessageAlternativeServiceEvents {
onStreamingUpdate: (messageId: string, content: string, isComplete: boolean, isIncremental?: boolean) => void;
onConversationUpdated: (conversation: ConversationData) => void;
onToolCallsDetected: (messageId: string, toolCalls: any[]) => void;
onLoadingStateChanged: (isLoading: boolean) => void;
onError: (message: string) => void;
}
/**
* Service for creating alternative AI responses when retrying messages.
*
* Clear-and-restream flow:
* 1. Save original content into a branch (preserves old response)
* 2. Clear message content and stream new response fresh
* 3. On success: message has new content, branch has old content
* 4. On abort: keep partial new content (original safe in branch)
* 5. Branch arrows navigate between new (current) and old (branch)
*/
export class MessageAlternativeService {
private currentAbortController: AbortController | null = null;
private currentStreamingMessageId: string | null = null;
/** Guard against concurrent retries on the same message */
private retryInProgress: Set<string> = new Set();
constructor(
private chatService: ChatService,
private branchManager: BranchManager,
private streamHandler: MessageStreamHandler,
private abortHandler: AbortHandler,
private events: MessageAlternativeServiceEvents
) {}
/**
* Create an alternative response for an AI message.
*
* Saves the original content as a branch, clears the message,
* and streams a fresh response directly into the conversation.
*/
async createAlternativeResponse(
conversation: ConversationData,
aiMessageId: string,
options?: {
provider?: string;
model?: string;
systemPrompt?: string;
workspaceId?: string;
sessionId?: string;
}
): Promise<void> {
// Concurrent retry guard: if a retry is already in progress for this message, bail
if (this.retryInProgress.has(aiMessageId)) {
return;
}
const aiMessageIndex = conversation.messages.findIndex(msg => msg.id === aiMessageId);
if (aiMessageIndex === -1) return;
const aiMessage = conversation.messages[aiMessageIndex];
if (!aiMessage || aiMessage.role !== 'assistant') return;
// Must have a preceding user message to retry against
if (aiMessageIndex === 0) return;
const userMessage = conversation.messages[aiMessageIndex - 1];
<span class="missing-if-branch" title="if path not taken" >I</span>if (!userMessage || userMessage.role !== 'user') <span class="cstat-no" title="statement not covered" >return;</span>
// Mark retry as in progress
this.retryInProgress.add(aiMessageId);
try {
this.events.onLoadingStateChanged(true);
// 1. Save original content as a branch FIRST (preserves old response)
const originalContent = aiMessage.content;
const originalToolCalls = aiMessage.toolCalls ? [...aiMessage.toolCalls] : undefined;
const originalReasoning = aiMessage.reasoning;
const branchMessage: ConversationMessage = {
id: `alt_${Date.now()}_${Math.random().toString(36).substring(2, 10)}`,
role: 'assistant',
content: originalContent,
timestamp: aiMessage.timestamp,
conversationId: conversation.id,
state: aiMessage.state || <span class="branch-1 cbranch-no" title="branch not covered" >'complete',</span>
toolCalls: originalToolCalls,
reasoning: originalReasoning
};
const branchId = await this.branchManager.createHumanBranch(
conversation,
aiMessageId,
branchMessage
);
// 1b. Collect and move continuation messages (e.g. tool-call follow-ups)
// that follow the retried AI message into the branch so they don't
// linger as stale content after the new response streams in.
const continuationMessages = conversation.messages.splice(aiMessageIndex + 1);
<span class="missing-if-branch" title="if path not taken" >I</span>if (continuationMessages.length > 0 && <span class="branch-1 cbranch-no" title="branch not covered" >branchId)</span> {
const targetBranch = <span class="cstat-no" title="statement not covered" >aiMessage.branches?.find(<span class="fstat-no" title="function not covered" >b </span>=> <span class="cstat-no" title="statement not covered" >b.id === branchId)</span>;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (targetBranch) {</span>
<span class="cstat-no" title="statement not covered" > targetBranch.messages.push(...continuationMessages);</span>
<span class="cstat-no" title="statement not covered" > targetBranch.updated = Date.now();</span>
// Persist the branch with its continuation messages
<span class="cstat-no" title="statement not covered" > await this.chatService.updateConversation(conversation);</span>
}
}
// 2. Clear the current message for fresh streaming
aiMessage.content = '';
aiMessage.toolCalls = undefined;
aiMessage.reasoning = undefined;
aiMessage.isLoading = true;
aiMessage.state = 'draft';
// Set activeAlternativeIndex to 0 so the UI shows the current message
// (the original content is now in the branch, navigable via branch arrows)
aiMessage.activeAlternativeIndex = 0;
// 3. Fire UI update so the user sees the cleared message with loading state
this.events.onConversationUpdated(conversation);
// 4. Create abort controller for this retry
this.currentAbortController = new AbortController();
this.currentStreamingMessageId = aiMessageId;
// 5. Get user message content for the LLM request
const userMessageContent = userMessage.content;
// 6. Stream new response directly into the live conversation
// The stream handler mutates conversation.messages[aiMessageIndex] in-place,
// fires onStreamingUpdate events for live UI updates, and handles tool calls.
await this.streamHandler.streamResponse(
conversation,
userMessageContent,
aiMessageId,
{
...options,
excludeFromMessageId: aiMessageId,
abortSignal: this.currentAbortController.signal
}
);
// 7. After streaming completes, save the updated conversation
await this.chatService.updateConversation(conversation);
// 8. Fire final UI update
this.events.onConversationUpdated(conversation);
} catch (error) {
if (error instanceof Error && error.name === 'AbortError') {
// On abort: keep whatever partial content was streamed.
// The original response is safe in the branch.
const abortedMessage = conversation.messages[aiMessageIndex];
if (abortedMessage) {
const hasContent = abortedMessage.content && abortedMessage.content.trim();
if (hasContent) {
// Keep partial content, clean up incomplete tool calls
abortedMessage.toolCalls = filterCompletedToolCalls(abortedMessage.toolCalls);
abortedMessage.isLoading = false;
abortedMessage.state = 'aborted';
await this.chatService.updateConversation(conversation);
this.events.onStreamingUpdate(aiMessageId, abortedMessage.content, true, false);
} else {
// No content streamed yet - mark as aborted with empty content
abortedMessage.isLoading = false;
abortedMessage.state = 'aborted';
abortedMessage.content = '';
await this.chatService.updateConversation(conversation);
}
}
this.events.onConversationUpdated(conversation);
} else {
this.events.onError('Failed to generate alternative response');
}
} finally {
this.retryInProgress.delete(aiMessageId);
this.currentAbortController = null;
this.currentStreamingMessageId = null;
this.events.onLoadingStateChanged(false);
}
}
/**
* Cancel current alternative generation
*/
cancel(): void {
<span class="missing-if-branch" title="if path not taken" >I</span>if (this.currentAbortController && <span class="branch-1 cbranch-no" title="branch not covered" >this.currentStreamingMessageId)</span> {
<span class="cstat-no" title="statement not covered" > this.currentAbortController.abort();</span>
<span class="cstat-no" title="statement not covered" > this.currentAbortController = null;</span>
<span class="cstat-no" title="statement not covered" > this.currentStreamingMessageId = null;</span>
}
}
/**
* Check if currently generating an alternative
*/
isGenerating(): boolean {
return this.currentAbortController !== null;
}
}
</pre></td></tr></table></pre>
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