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import type { OllamaMessage, OllamaTool } from './types';
import { ApiError } from './types';
import { Logger } from './utils';
interface OllamaChatResponse {
message?: Partial<OllamaMessage>;
}
export class OllamaClient {
private baseURL: string;
private model: string;
private fetchFn: typeof fetch;
private readonly maxRetries: number = 3;
constructor(baseURL: string, model: string, fetchFn?: typeof fetch) {
this.baseURL = baseURL;
this.model = model;
this.fetchFn = fetchFn ?? fetch;
}
async *streamChat(
messages: OllamaMessage[],
tools: OllamaTool[] = []
): AsyncGenerator<OllamaMessage, void, unknown> {
yield* this.streamChatWithRetry(messages, tools, 0);
}
async streamChatAsPromise(
messages: OllamaMessage[],
tools: OllamaTool[] = []
): Promise<OllamaMessage[]> {
const chunks: OllamaMessage[] = [];
for await (const chunk of this.streamChat(messages, tools)) {
chunks.push(chunk);
}
return chunks;
}
private async *streamChatWithRetry(
messages: OllamaMessage[],
tools: OllamaTool[] = [],
attempt: number = 0
): AsyncGenerator<OllamaMessage, void, unknown> {
// 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: true,
}),
signal: controller.signal,
});
if (!response.ok) {
if (response.status >= 500 && attempt < 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 < this.maxRetries - 1) {
const retryTimeout = new Promise((resolve) => setTimeout(resolve, retryDelay));
const abortListener = () => {
Logger.info('Retry aborted by user', 'ollama-client');
};
const signal = controller.signal;
if (signal) {
signal.addEventListener('abort', abortListener);
try {
await Promise.race([
retryTimeout,
new Promise<void>((resolve) => {
signal.addEventListener('abort', () => resolve(), {
once: true,
});
}),
]);
} finally {
signal.removeEventListener('abort', abortListener);
}
} else E{
await retryTimeout;
}
}
yield* this.streamChatWithRetry(messages, tools, attempt + 1);
return;
}
throw new ApiError(`Ollama API error: ${response.status}`, response.status);
}
if (!response.body) {
throw new Error('No response body');
}
const contentType = response.headers.get('content-type');
if (!contentType || (!contentType.includes('ndjson') && !contentType.includes('json'))) {
throw new Error('Invalid response format');
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = '';
let malformedCount = 0;
const maxMalformed = 50;
try {
while (true) {
const { done, value } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
const lines = buffer.split('\n');
buffer = lines.pop() ?? '';
for (const line of lines) {
if (!line.trim()) continue;
try {
const parsed = JSON.parse(line) as Record<string, unknown>;
this.throwIfOllamaError(parsed);
const message = this.toOllamaMessage(parsed.message);
Iif (!message) {
continue;
}
malformedCount = 0;
yield message;
} catch (error) {
if (error instanceof Error && error.message.startsWith('Ollama error:')) {
throw error;
}
malformedCount++;
if (malformedCount > maxMalformed) {
throw new Error('Too many malformed chunks in stream');
}
Logger.warn(
`Skipped malformed chunk: ${line.substring(0, 80)}... - ${(error as Error).message}`,
'ollama-client'
);
}
}
}
if (buffer.trim()) {
try {
const parsed = JSON.parse(buffer) as Record<string, unknown>;
this.throwIfOllamaError(parsed);
const message = this.toOllamaMessage(parsed.message);
if (message) {
yield message;
}
} catch (error) {
Iif (error instanceof Error && error.message.startsWith('Ollama error:')) {
throw error;
}
Logger.warn(
`Failed to parse final chunk: ${buffer.substring(0, 80)}...`,
'ollama-client'
);
}
}
} finally {
reader.releaseLock();
}
} finally {
// Abort the local controller
controller.abort();
}
}
async chat(messages: OllamaMessage[], tools: OllamaTool[] = []): Promise<OllamaMessage> {
return this.chatWithRetry(messages, tools, 0);
}
private async chatWithRetry(
messages: OllamaMessage[],
tools: OllamaTool[] = [],
attempt: number = 0
): Promise<OllamaMessage> {
// Create a local controller for this request instead of using the instance variable
const controller = new AbortController();
try {
const response = await this.fetchFn(`${this.baseURL}/api/chat`, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
model: this.model,
messages,
tools,
stream: false,
}),
signal: controller.signal,
});
if (!response.ok) {
if (response.status >= 500 && attempt < 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 < this.maxRetries - 1) {
const retryTimeout = new Promise((resolve) => setTimeout(resolve, retryDelay));
const abortListener = () => {
Logger.info('Retry aborted by user', 'ollama-client');
};
const signal = controller.signal;
if (signal) {
signal.addEventListener('abort', abortListener);
try {
await Promise.race([
retryTimeout,
new Promise<void>((resolve) => {
signal.addEventListener('abort', () => resolve(), {
once: true,
});
}),
]);
} finally {
signal.removeEventListener('abort', abortListener);
}
} else E{
await retryTimeout;
}
}
return this.chatWithRetry(messages, tools, attempt + 1);
}
throw new ApiError(`Ollama API error: ${response.status}`, response.status);
}
const data = (await response.json()) as OllamaChatResponse;
return (
this.toOllamaMessage(data.message) ?? { role: 'assistant', content: '', tool_calls: [] }
);
} finally {
// Abort the local controller
controller.abort();
}
}
private throwIfOllamaError(parsed: Record<string, unknown>): void {
if (parsed.error) {
throw new Error(`Ollama error: ${String(parsed.error)}`);
}
}
private toOllamaMessage(value: unknown): OllamaMessage | null {
if (!value || typeof value !== 'object') {
return null;
}
const record = value as Partial<OllamaMessage>;
return {
role: record.role ?? 'assistant',
content: typeof record.content === 'string' ? record.content : '',
tool_calls: record.tool_calls ?? [],
};
}
}
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