576 lines
22 KiB
TypeScript
576 lines
22 KiB
TypeScript
import type {
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CodingConversationRuntime,
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CodingRuntimeCommand,
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CodingRuntimeDiagnostics,
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ConversationInteraction,
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ConversationInteractionResponse,
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ConversationModelState,
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ConversationPatchEnvelope,
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ConversationSnapshot,
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PrepareConversationInput,
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ProductModelRef,
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PromptAcceptance,
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PromptMode,
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} from './contracts';
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import type { CodingConversationV2 } from '../coding-projects/conversation-store';
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import {
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CodingProjectService,
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CodingProjectServiceError,
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} from '../coding-projects/project-service';
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const MAX_TITLE_LENGTH = 200;
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const MAX_PROMPT_LENGTH = 100_000;
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const MAX_ATTACHMENTS = 16;
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const MAX_ACCEPTANCES = 512;
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const REQUEST_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$/;
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const ATTACHMENT_ID_PATTERN = /^[A-Za-z0-9-]{1,64}$/;
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export class CodingConversationServiceError extends Error {
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constructor(
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readonly status: 400 | 404 | 409 | 500 | 503,
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readonly code: string,
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message: string,
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) {
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super(message);
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this.name = 'CodingConversationServiceError';
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}
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}
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export type CodingPromptAcceptance = PromptAcceptance;
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interface AcceptanceRecord {
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fingerprint: string;
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flight: Promise<CodingPromptAcceptance>;
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state: { value: 'protected' | 'settled' };
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}
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export interface CodingConversationServiceOptions {
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archiveSession?(input: {
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projectId: string;
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sessionKey: string;
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}): Promise<void>;
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}
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export type CodingConversationStreamEvent =
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| {
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type: 'snapshot';
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conversationId: string;
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workerGeneration: number;
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seq: number;
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snapshot: ConversationSnapshot;
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}
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| ({ type: 'patch' } & ConversationPatchEnvelope);
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export interface CodingConversationEventStream {
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snapshots: ConversationSnapshot[];
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events: AsyncIterable<CodingConversationStreamEvent>;
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close(): void;
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}
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function requiredString(value: unknown, label: string, maximum: number): string {
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const normalized = typeof value === 'string' ? value.trim() : '';
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if (!normalized || normalized.length > maximum) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', `${label} is invalid`);
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}
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return normalized;
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}
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function runtimeError(error: unknown): never {
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if (error instanceof CodingConversationServiceError || error instanceof CodingProjectServiceError) {
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throw error;
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}
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const publicError = error && typeof error === 'object'
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&& 'publicError' in error
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&& error.publicError
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&& typeof error.publicError === 'object'
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? error.publicError as { code?: unknown; message?: unknown }
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: null;
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if (publicError && typeof publicError.code === 'string') {
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const status = publicError.code === 'CODING_CONVERSATION_NOT_FOUND'
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? 404
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: publicError.code === 'CODING_STORAGE_WRITE_FAILED'
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? 500
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: publicError.code === 'CODING_RUNTIME_START_FAILED'
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|| publicError.code === 'CODING_RUNTIME_READY_TIMEOUT'
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|| publicError.code === 'CODING_RUNTIME_PROTOCOL_ERROR'
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? 503
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: 409;
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throw new CodingConversationServiceError(
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status,
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publicError.code,
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typeof publicError.message === 'string' ? publicError.message : 'Coding runtime request failed',
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);
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}
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throw new CodingConversationServiceError(503, 'CODING_RUNTIME_UNAVAILABLE', 'The local coding runtime is unavailable');
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}
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async function persist<T>(operation: () => Promise<T>): Promise<T> {
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try {
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return await operation();
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} catch (error) {
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if (error instanceof CodingConversationServiceError || error instanceof CodingProjectServiceError) {
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throw error;
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}
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throw new CodingConversationServiceError(
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500,
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'CODING_STORAGE_WRITE_FAILED',
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'Coding data could not be persisted',
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);
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}
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}
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function publicConversation(conversation: CodingConversationV2): CodingConversationV2 {
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const { piSessionId: _piSessionId, sessionKey: _sessionKey, ...safe } = conversation;
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return safe;
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}
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class PatchQueue implements AsyncIterable<CodingConversationStreamEvent> {
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private readonly values: CodingConversationStreamEvent[] = [];
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private readonly waiters: Array<(result: IteratorResult<CodingConversationStreamEvent>) => void> = [];
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private closed = false;
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push(value: CodingConversationStreamEvent): void {
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if (this.closed) return;
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const waiter = this.waiters.shift();
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if (waiter) waiter({ value: structuredClone(value), done: false });
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else this.values.push(structuredClone(value));
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}
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close(): void {
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if (this.closed) return;
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this.closed = true;
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for (const waiter of this.waiters.splice(0)) waiter({ value: undefined, done: true });
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}
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[Symbol.asyncIterator](): AsyncIterator<CodingConversationStreamEvent> {
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return {
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next: async () => {
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const value = this.values.shift();
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if (value) return { value, done: false };
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if (this.closed) return { value: undefined, done: true };
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return await new Promise<IteratorResult<CodingConversationStreamEvent>>((resolve) => {
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this.waiters.push(resolve);
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});
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},
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return: async () => {
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this.close();
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return { value: undefined, done: true };
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},
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};
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}
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}
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export class CodingConversationService {
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private readonly prepareFlights = new Map<string, Promise<PrepareConversationInput>>();
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private readonly acceptances = new Map<string, AcceptanceRecord>();
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constructor(
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readonly projects: CodingProjectService,
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readonly runtime: CodingConversationRuntime,
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private readonly options: CodingConversationServiceOptions = {},
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) {}
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async listConversations(projectId?: string): Promise<CodingConversationV2[]> {
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const project = projectId
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? await this.projects.getProject(projectId)
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: await this.projects.requireActiveProject();
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return (await this.projects.conversationStore(project.path).read()).conversations.map(publicConversation);
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}
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async createConversation(input: {
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projectId?: string;
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agentId: unknown;
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title: unknown;
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}): Promise<CodingConversationV2> {
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const project = input.projectId
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? await this.projects.getProject(input.projectId)
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: await this.projects.requireActiveProject();
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const config = await this.projects.getConfig(project.id);
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const agentId = requiredString(input.agentId, 'Agent id', 64);
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const agent = config.config.agents.find((candidate) => (
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candidate.id === agentId && candidate.enabled && !candidate.archivedAt
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));
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if (!agent) {
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throw new CodingConversationServiceError(404, 'CODING_AGENT_NOT_FOUND', 'Coding project Agent does not exist');
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}
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const created = await persist(() => this.projects.conversationStore(project.path).create({
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agentId,
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title: requiredString(input.title, 'Conversation title', MAX_TITLE_LENGTH),
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model: agent.model,
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modelResolution: agent.modelResolution,
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}));
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return publicConversation(created);
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}
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async getConversation(conversationId: string): Promise<CodingConversationV2> {
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const { conversation } = await this.projects.findActiveConversation(conversationId);
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return publicConversation(conversation);
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}
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async patchConversation(conversationId: string, patch: {
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title?: unknown;
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archived?: unknown;
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unread?: unknown;
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}): Promise<CodingConversationV2> {
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const { project } = await this.projects.findActiveConversation(conversationId);
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if (patch.title === undefined && patch.archived === undefined && patch.unread === undefined) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Conversation patch is empty');
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}
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if (patch.archived !== undefined && typeof patch.archived !== 'boolean') {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Conversation archive state is invalid');
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}
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if (patch.unread !== undefined && typeof patch.unread !== 'boolean') {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Conversation unread state is invalid');
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}
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const updated = await persist(() => this.projects.conversationStore(project.path).patchMetadata(conversationId, {
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...(patch.title !== undefined
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? { title: requiredString(patch.title, 'Conversation title', MAX_TITLE_LENGTH) }
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: {}),
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...(typeof patch.archived === 'boolean'
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? { archivedAt: patch.archived ? new Date().toISOString() : null }
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: {}),
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...(typeof patch.unread === 'boolean' ? { unread: patch.unread } : {}),
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}));
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return publicConversation(updated);
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}
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async deleteConversation(conversationId: string): Promise<void> {
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const { project, conversation } = await this.projects.findActiveConversation(conversationId);
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try {
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await this.runtime.dispose(conversationId);
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} catch (error) {
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runtimeError(error);
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}
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await this.archiveSession(project.id, conversation.sessionKey);
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await persist(() => this.projects.conversationStore(project.path).delete(conversationId));
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this.prepareFlights.delete(conversationId);
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for (const key of [...this.acceptances.keys()]) {
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if (key.startsWith(`${conversationId}\u0000`)) this.acceptances.delete(key);
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}
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}
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async getSnapshot(conversationId: string): Promise<ConversationSnapshot> {
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await this.ensurePrepared(conversationId);
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try {
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return await this.runtime.getSnapshot(conversationId);
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} catch (error) {
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runtimeError(error);
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}
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}
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async acceptPrompt(input: {
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conversationId: string;
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clientRequestId: unknown;
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mode: unknown;
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text: unknown;
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attachments?: unknown;
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}): Promise<CodingPromptAcceptance> {
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const conversationId = requiredString(input.conversationId, 'Conversation id', 128);
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const clientRequestId = typeof input.clientRequestId === 'string' ? input.clientRequestId : '';
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if (!REQUEST_ID_PATTERN.test(clientRequestId)) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Client request id is invalid');
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}
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if (!['prompt', 'steer', 'follow-up'].includes(String(input.mode))) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Prompt mode is invalid');
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}
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if (typeof input.text !== 'string' || input.text.length > MAX_PROMPT_LENGTH) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Prompt text is invalid');
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}
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const attachments = Array.isArray(input.attachments) ? input.attachments : [];
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if (attachments.length > MAX_ATTACHMENTS || attachments.some((item) => (
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!item || typeof item !== 'object' || Array.isArray(item)
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|| !ATTACHMENT_ID_PATTERN.test(String((item as { attachmentId?: unknown }).attachmentId ?? ''))
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))) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Prompt attachments are invalid');
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}
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if (!input.text.trim() && attachments.length === 0) {
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throw new CodingConversationServiceError(400, 'CODING_CONVERSATION_REQUEST_INVALID', 'Prompt content is empty');
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}
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const mode = input.mode as PromptMode;
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const normalizedAttachments = attachments.map((item) => ({
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attachmentId: String((item as { attachmentId: unknown }).attachmentId),
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}));
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const fingerprint = JSON.stringify({ mode, text: input.text, attachments: normalizedAttachments });
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const key = `${conversationId}\u0000${clientRequestId}`;
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const prior = this.acceptances.get(key);
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if (prior) {
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if (prior.fingerprint !== fingerprint) {
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throw new CodingConversationServiceError(409, 'CODING_REQUEST_ID_CONFLICT', 'Client request id was already used');
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}
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if (prior.state.value === 'settled') {
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this.acceptances.delete(key);
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this.acceptances.set(key, prior);
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}
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return await prior.flight;
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}
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this.reserveAcceptanceSlot();
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const acceptanceState: AcceptanceRecord['state'] = { value: 'protected' };
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const flight = (async (): Promise<CodingPromptAcceptance> => {
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try {
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await this.ensurePrepared(conversationId);
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const acceptance = await this.runtime.prompt({
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conversationId,
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clientRequestId,
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mode,
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text: input.text as string,
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attachments: normalizedAttachments,
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});
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acceptanceState.value = 'settled';
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return acceptance;
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} catch (error) {
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const publicCode = error && typeof error === 'object'
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&& 'publicError' in error
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&& error.publicError
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&& typeof error.publicError === 'object'
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&& 'code' in error.publicError
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? String(error.publicError.code)
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: '';
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if (publicCode !== 'CODING_REQUEST_UNCERTAIN') this.acceptances.delete(key);
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runtimeError(error);
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}
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})();
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this.acceptances.set(key, { fingerprint, flight, state: acceptanceState });
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return await flight;
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}
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async abort(conversationId: string): Promise<void> {
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await this.ensurePrepared(conversationId);
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try { await this.runtime.abort(conversationId); } catch (error) { runtimeError(error); }
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}
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async setModel(conversationId: string, model: ProductModelRef): Promise<ConversationModelState> {
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const { project } = await this.projects.findActiveConversation(conversationId);
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let selected: ProductModelRef;
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try {
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selected = await this.runtime.validateModel(model);
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} catch (error) { runtimeError(error); }
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const state: ConversationModelState = {
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model: selected,
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modelResolution: 'resolved',
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};
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await persist(() => this.projects.conversationStore(project.path).setModelState(conversationId, state));
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const preparing = this.prepareFlights.get(conversationId);
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if (preparing) await preparing.catch(() => undefined);
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try {
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await this.runtime.dispose(conversationId);
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this.prepareFlights.delete(conversationId);
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await this.ensurePrepared(conversationId);
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return state;
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} catch (error) { runtimeError(error); }
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}
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async setThinking(conversationId: string, thinkingLevel: ProductModelRef['thinkingLevel']): Promise<ConversationModelState> {
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await this.ensurePrepared(conversationId);
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const { project } = await this.projects.findActiveConversation(conversationId);
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try {
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const state = await this.runtime.setThinking({ conversationId, thinkingLevel });
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await this.projects.conversationStore(project.path).setModelState(conversationId, state);
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return state;
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} catch (error) { runtimeError(error); }
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}
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async compact(conversationId: string): Promise<void> {
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await this.ensurePrepared(conversationId);
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try { await this.runtime.compact(conversationId); } catch (error) { runtimeError(error); }
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}
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async recover(conversationId: string): Promise<void> {
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await this.ensurePrepared(conversationId);
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try { await this.runtime.recover(conversationId); } catch (error) { runtimeError(error); }
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}
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async fork(sourceConversationId: string, sourceEntryId?: string): Promise<CodingConversationV2> {
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const prepared = await this.ensurePrepared(sourceConversationId);
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const source = await this.projects.findActiveConversation(sourceConversationId);
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const store = this.projects.conversationStore(source.project.path);
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const created = await persist(() => store.create({
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agentId: source.conversation.agentId,
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title: `${source.conversation.title} (fork)`,
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model: source.conversation.model,
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modelResolution: source.conversation.modelResolution,
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}));
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try {
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await this.runtime.fork({
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sourceConversationId,
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...(sourceEntryId ? { sourceEntryId } : {}),
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conversation: {
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...prepared,
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conversationId: created.id,
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title: created.title,
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model: {
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model: created.model,
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modelResolution: created.modelResolution,
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},
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},
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});
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return publicConversation(created);
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} catch (error) {
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try {
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await this.runtime.dispose(created.id);
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const latest = await store.get(created.id);
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await this.archiveSession(source.project.id, latest?.sessionKey);
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await persist(() => store.delete(created.id));
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} catch {
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// Keep product metadata when cleanup cannot complete so the partial
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// runtime/session remains owned and can be diagnosed or deleted later.
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}
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runtimeError(error);
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}
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}
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async listInteractions(conversationId?: string): Promise<ConversationInteraction[]> {
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if (conversationId) await this.projects.findActiveConversation(conversationId);
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try { return await this.runtime.listInteractions(conversationId); } catch (error) { runtimeError(error); }
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}
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async respondInteraction(conversationId: string, response: ConversationInteractionResponse): Promise<void> {
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const id = requiredString(conversationId, 'Conversation id', 128);
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if ('optionId' in response && (response.optionId.length === 0 || response.optionId.length > 256)) {
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throw new CodingConversationServiceError(400, 'CODING_INTERACTION_REQUEST_INVALID', 'Interaction option is invalid');
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}
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if ('value' in response && response.value.length > MAX_PROMPT_LENGTH) {
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throw new CodingConversationServiceError(400, 'CODING_INTERACTION_REQUEST_INVALID', 'Interaction value is invalid');
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}
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await this.projects.findActiveConversation(id);
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try { await this.runtime.respondInteraction(id, response); } catch (error) { runtimeError(error); }
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}
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async listLiveCommands(conversationId: string): Promise<CodingRuntimeCommand[]> {
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await this.projects.findActiveConversation(conversationId);
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try { return await this.runtime.listCommands(conversationId); } catch { return []; }
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}
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getDiagnostics(): CodingRuntimeDiagnostics {
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return this.runtime.getDiagnostics();
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}
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markProviderStale(): void { this.runtime.markProviderStale(); }
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markResourcesStale(): void { this.runtime.markResourcesStale(); }
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async openEventStream(conversationId?: string): Promise<CodingConversationEventStream> {
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const id = conversationId === undefined
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? undefined
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: requiredString(conversationId, 'Conversation id', 128);
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if (id) await this.projects.findActiveConversation(id);
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const queue = new PatchQueue();
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const cursors = new Map<string, ConversationSnapshot['cursor']>();
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let initialize!: () => void;
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const initialized = new Promise<void>((resolve) => { initialize = resolve; });
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let eventTail = Promise.resolve();
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const unsubscribe = this.runtime.subscribe((event) => {
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if (id && event.conversationId !== id) return;
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eventTail = eventTail.then(async () => {
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await initialized;
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const cursor = cursors.get(event.conversationId);
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if (cursor && event.workerGeneration === cursor.workerGeneration && event.seq <= cursor.seq) return;
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if (!cursor
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|| event.workerGeneration !== cursor.workerGeneration
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|| event.seq !== cursor.seq + 1) {
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try {
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|
const snapshot = await this.runtime.getSnapshot(event.conversationId);
|
|
cursors.set(event.conversationId, snapshot.cursor);
|
|
queue.push({
|
|
type: 'snapshot',
|
|
conversationId: event.conversationId,
|
|
workerGeneration: snapshot.cursor.workerGeneration,
|
|
seq: snapshot.cursor.seq,
|
|
snapshot,
|
|
});
|
|
} catch {
|
|
// A disposed Conversation has no reconnect state to publish.
|
|
}
|
|
return;
|
|
}
|
|
cursors.set(event.conversationId, {
|
|
workerGeneration: event.workerGeneration,
|
|
seq: event.seq,
|
|
});
|
|
queue.push({ type: 'patch', ...event });
|
|
}).catch(() => undefined);
|
|
});
|
|
try {
|
|
const snapshots = id
|
|
? [await this.getSnapshot(id)]
|
|
: (await Promise.all(this.runtime.getDiagnostics().workers.map(async ({ conversationId: target }) => {
|
|
try { return await this.runtime.getSnapshot(target); } catch { return null; }
|
|
}))).filter((snapshot): snapshot is ConversationSnapshot => snapshot !== null);
|
|
for (const snapshot of snapshots) {
|
|
cursors.set(snapshot.conversation.id, snapshot.cursor);
|
|
}
|
|
initialize();
|
|
return {
|
|
snapshots,
|
|
events: queue,
|
|
close: () => {
|
|
unsubscribe();
|
|
queue.close();
|
|
},
|
|
};
|
|
} catch (error) {
|
|
initialize();
|
|
unsubscribe();
|
|
queue.close();
|
|
throw error;
|
|
}
|
|
}
|
|
|
|
private ensurePrepared(conversationId: string): Promise<PrepareConversationInput> {
|
|
const id = conversationId.trim();
|
|
const prior = this.prepareFlights.get(id);
|
|
if (prior) return prior;
|
|
const flight = (async () => {
|
|
const { project, conversation } = await this.projects.findActiveConversation(id);
|
|
const config = await this.projects.getConfig(project.id);
|
|
const agent = config.config.agents.find((candidate) => (
|
|
candidate.id === conversation.agentId && candidate.enabled && !candidate.archivedAt
|
|
));
|
|
if (!agent) {
|
|
throw new CodingConversationServiceError(409, 'CODING_AGENT_NOT_FOUND', 'Conversation Agent is unavailable');
|
|
}
|
|
const prepared: PrepareConversationInput = {
|
|
conversationId: conversation.id,
|
|
projectId: project.id,
|
|
agentId: conversation.agentId,
|
|
title: conversation.title,
|
|
model: {
|
|
model: conversation.model,
|
|
modelResolution: conversation.modelResolution,
|
|
},
|
|
};
|
|
try { await this.runtime.prepare(prepared); } catch (error) { runtimeError(error); }
|
|
return prepared;
|
|
})().finally(() => {
|
|
if (this.prepareFlights.get(id) === flight) this.prepareFlights.delete(id);
|
|
});
|
|
this.prepareFlights.set(id, flight);
|
|
return flight;
|
|
}
|
|
|
|
private reserveAcceptanceSlot(): void {
|
|
while (this.acceptances.size >= MAX_ACCEPTANCES) {
|
|
const settled = [...this.acceptances.entries()]
|
|
.find(([, record]) => record.state.value === 'settled');
|
|
if (!settled) {
|
|
throw new CodingConversationServiceError(
|
|
503,
|
|
'CODING_REQUEST_CAPACITY_EXCEEDED',
|
|
'The local request registry is full',
|
|
);
|
|
}
|
|
this.acceptances.delete(settled[0]);
|
|
}
|
|
}
|
|
|
|
private async archiveSession(projectId: string, sessionKey: string | undefined): Promise<void> {
|
|
if (!sessionKey) return;
|
|
if (!this.options.archiveSession) {
|
|
throw new CodingConversationServiceError(
|
|
500,
|
|
'CODING_STORAGE_WRITE_FAILED',
|
|
'Coding session archival is unavailable',
|
|
);
|
|
}
|
|
await persist(() => this.options.archiveSession!({ projectId, sessionKey }));
|
|
}
|
|
}
|