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T
fegger 9823761e03 Implement stream cancellation in OllamaClient 
Add `cancelStream` method to allow aborting active requests. Store the current `AbortController` on the client instance
and reset it when the stream completes or is cancelled. Update `ChatView` to call `cancelStream` on close.

Add comprehensive tests for stream cancellation scenarios, including aborting active requests, handling cancellation
when no stream is active, clearing the controller after normal completion, and allowing new streams after cancellation.
2026-05-07 12:11:01 +02:00

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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">// src/ollama-client.ts
&nbsp;
import type { OllamaMessage, OllamaTool } from './types';
import { ApiError } from './types';
import { Logger } from './utils';
&nbsp;
interface OllamaChatResponse {
message?: Partial&lt;OllamaMessage&gt;;
}
&nbsp;
export class OllamaClient {
private baseURL: string;
private model: string;
private fetchFn: typeof fetch;
private readonly maxRetries: number = 3;
private currentStreamController: AbortController | null = null;
&nbsp;
constructor(baseURL: string, model: string, fetchFn?: typeof fetch) {
this.baseURL = baseURL;
this.model = model;
this.fetchFn = fetchFn ?? fetch;
}
&nbsp;
cancelStream(): void {
if (this.currentStreamController) {
this.currentStreamController.abort();
this.currentStreamController = null;
}
}
&nbsp;
async *streamChat(
messages: OllamaMessage[],
tools: OllamaTool[] = <span class="branch-0 cbranch-no" title="branch not covered" >[]</span>
): AsyncGenerator&lt;OllamaMessage, void, unknown&gt; {
yield* this.streamChatWithRetry(messages, tools, 0);
}
&nbsp;
async streamChatAsPromise(
messages: OllamaMessage[],
tools: OllamaTool[] = <span class="branch-0 cbranch-no" title="branch not covered" >[]</span>
): Promise&lt;OllamaMessage[]&gt; {
const chunks: OllamaMessage[] = [];
for await (const chunk of this.streamChat(messages, tools)) {
<span class="cstat-no" title="statement not covered" > chunks.push(chunk);</span>
}
<span class="cstat-no" title="statement not covered" > return chunks;</span>
}
&nbsp;
private async *streamChatWithRetry(
messages: OllamaMessage[],
tools: OllamaTool[] = <span class="branch-0 cbranch-no" title="branch not covered" >[],</span>
attempt: number = <span class="branch-0 cbranch-no" title="branch not covered" >0</span>
): AsyncGenerator&lt;OllamaMessage, void, unknown&gt; {
// Create a local controller for this request instead of using the instance variable
const controller = new AbortController();
this.currentStreamController = controller;
&nbsp;
try {
const response = await this.fetchFn(`${this.baseURL}/api/chat`, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
model: this.model,
messages,
tools,
stream: true,
}),
signal: controller.signal,
});
&nbsp;
if (!response.ok) {
if (response.status &gt;= 500 &amp;&amp; attempt &lt; this.maxRetries) {
const retryDelay = Math.pow(2, attempt) * 100;
Logger.warn(
`Network error (status ${response.status}), retrying in ${retryDelay}ms (attempt ${attempt + 1}/${this.maxRetries})`,
'ollama-client'
);
if (attempt &lt; this.maxRetries - 1) {
const retryTimeout = new Promise((resolve) =&gt; setTimeout(resolve, retryDelay));
const abortListener = <span class="fstat-no" title="function not covered" >() =</span>&gt; {
<span class="cstat-no" title="statement not covered" > Logger.info('Retry aborted by user', 'ollama-client');</span>
};
const signal = controller.signal;
if (signal) {
signal.addEventListener('abort', abortListener);
try {
await Promise.race([
retryTimeout,
new Promise&lt;void&gt;((resolve) =&gt; {
signal.addEventListener('abort', () =&gt; resolve(), {
once: true,
});
}),
]);
} finally {
signal.removeEventListener('abort', abortListener);
}
} else <span class="missing-if-branch" title="else path not taken" >E</span>{
<span class="cstat-no" title="statement not covered" > await retryTimeout;</span>
}
}
yield* this.streamChatWithRetry(messages, tools, attempt + 1);
return;
}
throw new ApiError(`Ollama API error: ${response.status}`, response.status);
}
&nbsp;
if (!response.body) {
throw new Error('No response body');
}
&nbsp;
const contentType = response.headers.get('content-type');
if (!contentType || (!contentType.includes('ndjson') &amp;&amp; !contentType.includes('json'))) {
throw new Error('Invalid response format');
}
&nbsp;
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = '';
let malformedCount = 0;
const maxMalformed = 50;
&nbsp;
try {
while (true) {
const { done, value } = await reader.read();
if (done) break;
&nbsp;
buffer += decoder.decode(value, { stream: true });
&nbsp;
const lines = buffer.split('\n');
buffer = lines.pop() ?? <span class="branch-1 cbranch-no" title="branch not covered" >'';</span>
&nbsp;
for (const line of lines) {
if (!line.trim()) continue;
&nbsp;
try {
const parsed = JSON.parse(line) as Record&lt;string, unknown&gt;;
this.throwIfOllamaError(parsed);
&nbsp;
const message = this.toOllamaMessage(parsed.message);
<span class="missing-if-branch" title="if path not taken" >I</span>if (!message) {
<span class="cstat-no" title="statement not covered" > continue;</span>
}
&nbsp;
malformedCount = 0;
yield message;
} catch (error) {
if (error instanceof Error &amp;&amp; error.message.startsWith('Ollama error:')) {
throw error;
}
&nbsp;
malformedCount++;
if (malformedCount &gt; maxMalformed) {
throw new Error('Too many malformed chunks in stream');
}
&nbsp;
Logger.warn(
`Skipped malformed chunk: ${line.substring(0, 80)}... - ${(error as Error).message}`,
'ollama-client'
);
}
}
}
&nbsp;
if (buffer.trim()) {
try {
const parsed = JSON.parse(buffer) as Record&lt;string, unknown&gt;;
this.throwIfOllamaError(parsed);
&nbsp;
const message = this.toOllamaMessage(parsed.message);
if (message) {
yield message;
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (error instanceof Error &amp;&amp; error.message.startsWith('Ollama error:')) {</span>
<span class="cstat-no" title="statement not covered" > throw error;</span>
}
<span class="cstat-no" title="statement not covered" > Logger.warn(</span>
`Failed to parse final chunk: ${buffer.substring(0, 80)}...`,
'ollama-client'
);
}
}
} finally {
reader.releaseLock();
}
} finally {
// Abort the local controller
controller.abort();
}
// Clean up the reference
this.currentStreamController = null;
}
&nbsp;
async chat(messages: OllamaMessage[], tools: OllamaTool[] = <span class="branch-0 cbranch-no" title="branch not covered" >[])</span>: Promise&lt;OllamaMessage&gt; {
return this.chatWithRetry(messages, tools, 0);
}
&nbsp;
private async chatWithRetry(
messages: OllamaMessage[],
tools: OllamaTool[] = <span class="branch-0 cbranch-no" title="branch not covered" >[],</span>
attempt: number = <span class="branch-0 cbranch-no" title="branch not covered" >0</span>
): Promise&lt;OllamaMessage&gt; {
// Create a local controller for this request instead of using the instance variable
const controller = new AbortController();
try {
const response = await this.fetchFn(`${this.baseURL}/api/chat`, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
model: this.model,
messages,
tools,
stream: false,
}),
signal: controller.signal,
});
&nbsp;
if (!response.ok) {
if (response.status &gt;= 500 &amp;&amp; attempt &lt; this.maxRetries) {
const retryDelay = Math.pow(2, attempt) * 100;
Logger.warn(
`Network error (status ${response.status}), retrying in ${retryDelay}ms (attempt ${attempt + 1}/${this.maxRetries})`,
'ollama-client'
);
if (attempt &lt; this.maxRetries - 1) {
const retryTimeout = new Promise((resolve) =&gt; setTimeout(resolve, retryDelay));
const abortListener = <span class="fstat-no" title="function not covered" >() =</span>&gt; {
<span class="cstat-no" title="statement not covered" > Logger.info('Retry aborted by user', 'ollama-client');</span>
};
const signal = controller.signal;
if (signal) {
signal.addEventListener('abort', abortListener);
try {
await Promise.race([
retryTimeout,
new Promise&lt;void&gt;((resolve) =&gt; {
signal.addEventListener('abort', () =&gt; resolve(), {
once: true,
});
}),
]);
} finally {
signal.removeEventListener('abort', abortListener);
}
} else <span class="missing-if-branch" title="else path not taken" >E</span>{
<span class="cstat-no" title="statement not covered" > await retryTimeout;</span>
}
}
return this.chatWithRetry(messages, tools, attempt + 1);
}
throw new ApiError(`Ollama API error: ${response.status}`, response.status);
}
&nbsp;
const data = (await response.json()) as OllamaChatResponse;
return (
this.toOllamaMessage(data.message) ?? { role: 'assistant', content: '', tool_calls: [] }
);
} finally {
// Abort the local controller
controller.abort();
}
}
&nbsp;
private throwIfOllamaError(parsed: Record&lt;string, unknown&gt;): void {
if (parsed.error) {
throw new Error(`Ollama error: ${String(parsed.error)}`);
}
}
&nbsp;
private toOllamaMessage(value: unknown): OllamaMessage | null {
if (!value || typeof value !== 'object') {
return null;
}
&nbsp;
const record = value as Partial&lt;OllamaMessage&gt;;
return {
role: record.role ?? 'assistant',
content: typeof record.content === 'string' ? record.content : <span class="branch-1 cbranch-no" title="branch not covered" >'',</span>
tool_calls: record.tool_calls ?? [],
};
}
}
&nbsp;</pre></td></tr></table></pre>
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