feat(FN-1360): add chat API with AI agent and SSE streaming
- Add ChatManager class for managing chat sessions with AI agent integration - Implement SSE streaming for real-time chat responses - Add chat API routes for creating sessions, sending messages, and streaming responses - Wire ChatStore and ChatManager into server initialization - Add comprehensive test suite for all chat routes
This commit is contained in:
gsxdsm
@@ -9,6 +9,7 @@ import * as nodeFs from "node:fs";
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import * as nodeChildProcess from "node:child_process";
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import type { TaskStore, Column, MergeResult, ScheduleType, ActivityEventType, ModelPreset, AutomationStep, MessageType, ParticipantType, MessageCreateInput } from "@fusion/core";
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import { COLUMNS, VALID_TRANSITIONS, GLOBAL_SETTINGS_KEYS, type BatchStatusEntry, type BatchStatusResponse, type BatchStatusResult, type IssueInfo, type PrInfo, type Task, getCurrentRepo, isGhAuthenticated, AUTOMATION_PRESETS, AutomationStore, validateBackupSchedule, validateBackupRetention, validateBackupDir, syncBackupAutomation, exportSettings, importSettings, validateImportData, MessageStore, MEMORY_FILE_PATH } from "@fusion/core";
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import type { ChatStore, ChatSessionCreateInput, ChatSessionUpdateInput } from "@fusion/core";
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import type { ServerOptions } from "./server.js";
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import { GitHubClient, parseBadgeUrl } from "./github.js";
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import { githubRateLimiter } from "./github-poll.js";
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@@ -51,6 +52,7 @@ import {
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sendErrorResponse,
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unauthorized,
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} from "./api-error.js";
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import { rateLimit, RATE_LIMITS } from "./rate-limit.js";
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/**
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* Minimal interface matching pi-coding-agent's ModelRegistry API surface
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@@ -6856,6 +6858,423 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
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}
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});
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// ── Chat Routes ────────────────────────────────────────────────────────────
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/**
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* GET /api/chat/sessions
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* List chat sessions with optional filtering.
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* Query params: projectId?, status?, agentId?
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*/
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router.get("/chat/sessions", rateLimit(RATE_LIMITS.api), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const { projectId, status, agentId } = req.query as {
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projectId?: string;
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status?: string;
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agentId?: string;
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};
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const sessions = chatStore.listSessions({
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...(projectId && { projectId }),
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...(status && { status: status as "active" | "archived" }),
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...(agentId && { agentId }),
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});
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res.json({ sessions });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to list chat sessions");
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}
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});
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/**
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* POST /api/chat/sessions
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* Create a new chat session.
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* Body: { agentId: string, title?: string, modelProvider?: string, modelId?: string }
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*/
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router.post("/chat/sessions", rateLimit(RATE_LIMITS.mutation), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const { agentId, title, modelProvider, modelId } = req.body as {
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agentId?: string;
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title?: string;
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modelProvider?: string;
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modelId?: string;
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};
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if (!agentId || typeof agentId !== "string" || !agentId.trim()) {
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throw badRequest("agentId is required");
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}
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// Validate optional model pair consistency
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const normalizedProvider = validateOptionalModelField(modelProvider, "modelProvider");
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const normalizedModelId = validateOptionalModelField(modelId, "modelId");
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if ((normalizedProvider && !normalizedModelId) || (!normalizedProvider && normalizedModelId)) {
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throw badRequest("modelProvider and modelId must both be provided or neither");
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}
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const session = chatStore.createSession({
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agentId: agentId.trim(),
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title: title?.trim() || null,
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modelProvider: normalizedProvider ?? null,
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modelId: normalizedModelId ?? null,
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});
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res.status(201).json({ session });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to create chat session");
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}
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});
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/**
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* GET /api/chat/sessions/:id
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* Get a single chat session.
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*/
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router.get("/chat/sessions/:id", async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const sessionId = String(req.params.id);
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const session = chatStore.getSession(sessionId);
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if (!session) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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res.json({ session });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to get chat session");
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}
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});
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/**
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* PATCH /api/chat/sessions/:id
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* Update a chat session (title, status).
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* Body: { title?: string, status?: "active" | "archived" }
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*/
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router.patch("/chat/sessions/:id", rateLimit(RATE_LIMITS.mutation), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const sessionId = String(req.params.id);
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const { title, status } = req.body as { title?: string; status?: string };
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// Validate status if provided
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if (status !== undefined && status !== "active" && status !== "archived") {
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throw badRequest("status must be 'active' or 'archived'");
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}
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const session = chatStore.updateSession(sessionId, {
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...(title !== undefined && { title: title?.trim() || null }),
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...(status !== undefined && { status }),
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});
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if (!session) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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res.json({ session });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to update chat session");
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}
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});
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/**
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* DELETE /api/chat/sessions/:id
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* Delete a chat session and all its messages.
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*/
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router.delete("/chat/sessions/:id", rateLimit(RATE_LIMITS.mutation), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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const sessionId = String(req.params.id);
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const deleted = chatStore.deleteSession(sessionId);
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if (!deleted) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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res.json({ success: true });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to delete chat session");
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}
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});
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/**
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* GET /api/chat/sessions/:id/messages
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* Get messages for a chat session with pagination.
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* Query params: limit? (default 50, max 200), offset? (default 0), before? (ISO timestamp)
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*/
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router.get("/chat/sessions/:id/messages", async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const sessionId = String(req.params.id);
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// Verify session exists
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const session = chatStore.getSession(sessionId);
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if (!session) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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const { limit: limitStr, offset: offsetStr, before } = req.query as {
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limit?: string;
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offset?: string;
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before?: string;
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};
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// Validate pagination params
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const limit = limitStr !== undefined ? parseInt(String(limitStr), 10) : 50;
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const offset = offsetStr !== undefined ? parseInt(String(offsetStr), 10) : 0;
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if (!Number.isFinite(limit) || limit < 1) {
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throw badRequest("limit must be a positive integer");
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}
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if (!Number.isFinite(offset) || offset < 0) {
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throw badRequest("offset must be a non-negative integer");
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}
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const effectiveLimit = Math.min(limit, 200);
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const messages = chatStore.getMessages(sessionId, {
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limit: effectiveLimit,
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offset,
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...(before && { before }),
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});
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res.json({ messages });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to get chat messages");
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}
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});
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/**
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* POST /api/chat/sessions/:id/messages
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* Send a message and stream AI response via SSE.
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* Body: { content: string, modelProvider?: string, modelId?: string }
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*
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* Event types:
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* - thinking: AI thinking output chunks
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* - text: AI response text chunks
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* - done: Message sent successfully with messageId
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* - error: Error message
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*/
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router.post("/chat/sessions/:id/messages", rateLimit(RATE_LIMITS.sse), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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const chatManager = options?.chatManager;
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if (!chatStore || !chatManager) {
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throw internalError("Chat store or manager not available");
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}
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const { content, modelProvider, modelId } = req.body as {
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content?: string;
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modelProvider?: string;
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modelId?: string;
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};
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const sessionId = String(req.params.id);
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if (!content || typeof content !== "string" || !content.trim()) {
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throw badRequest("content is required and must be a non-empty string");
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}
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// Verify session exists
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const session = chatStore.getSession(sessionId);
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if (!session) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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// Set SSE headers
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res.setHeader("Content-Type", "text/event-stream");
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res.setHeader("Cache-Control", "no-cache");
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res.setHeader("Connection", "keep-alive");
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res.setHeader("X-Accel-Buffering", "no");
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res.flushHeaders();
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// Send initial connection confirmation
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res.write(": connected\n\n");
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// Import chat modules
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const { chatStreamManager, checkRateLimit: checkChatRateLimit, getRateLimitResetTime: getChatRateLimitResetTime } = await import("./chat.js");
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// Check rate limit
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const ip = req.ip || req.socket.remoteAddress || "unknown";
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if (!checkChatRateLimit(ip)) {
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const resetTime = getChatRateLimitResetTime(ip);
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writeSSEEvent(res, "error", JSON.stringify({
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message: `Rate limit exceeded. Reset at ${resetTime?.toISOString() || "unknown"}`,
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}));
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res.end();
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return;
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}
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// Replay buffered events if client sent Last-Event-ID
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const lastEventId = parseLastEventId(req);
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if (lastEventId !== undefined) {
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const buffered = chatStreamManager.getBufferedEvents(sessionId, lastEventId);
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for (const bufferedEvent of buffered) {
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if (!writeSSEEvent(res, bufferedEvent.event, bufferedEvent.data, bufferedEvent.id)) {
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res.end();
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return;
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}
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}
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}
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// Subscribe to session events
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const unsubscribe = chatStreamManager.subscribe(sessionId, (event, eventId) => {
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const data = (event as { data?: unknown }).data;
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if (!writeSSEEvent(res, event.type, JSON.stringify(data ?? {}), eventId)) {
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unsubscribe();
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return;
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}
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// End stream on done or error
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if (event.type === "done" || event.type === "error") {
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unsubscribe();
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res.end();
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}
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});
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// Handle client disconnect
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req.on("close", () => {
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unsubscribe();
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});
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// Send heartbeat every 30s to keep connection alive
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const heartbeat = setInterval(() => {
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if (res.writableEnded) {
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clearInterval(heartbeat);
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return;
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}
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res.write(": heartbeat\n\n");
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}, 30_000);
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req.on("close", () => {
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clearInterval(heartbeat);
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});
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// Send message in background (non-blocking)
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// Validate optional model pair consistency
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const normalizedProvider = validateOptionalModelField(modelProvider, "modelProvider");
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const normalizedModelId = validateOptionalModelField(modelId, "modelId");
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if ((normalizedProvider && !normalizedModelId) || (!normalizedProvider && normalizedModelId)) {
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chatStreamManager.broadcast(sessionId, {
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type: "error",
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data: "modelProvider and modelId must both be provided or neither",
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});
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unsubscribe();
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res.end();
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return;
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}
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// Fire and forget - streaming happens via callbacks
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chatManager.sendMessage(
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sessionId,
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content.trim(),
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normalizedProvider,
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normalizedModelId,
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).catch((err: Error) => {
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console.error(`[chat:routes] Error in sendMessage:`, err);
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chatStreamManager.broadcast(sessionId, {
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type: "error",
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data: err.message || "Failed to process message",
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});
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});
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to send chat message");
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}
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});
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/**
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* DELETE /api/chat/sessions/:id/messages/:messageId
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* Delete a specific message from a chat session.
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*/
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router.delete("/chat/sessions/:id/messages/:messageId", rateLimit(RATE_LIMITS.mutation), async (req, res) => {
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try {
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const chatStore = options?.chatStore;
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if (!chatStore) {
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throw internalError("Chat store not available");
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}
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const sessionId = String(req.params.id);
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const messageId = String(req.params.messageId);
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// Verify session exists
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const session = chatStore.getSession(sessionId);
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if (!session) {
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throw notFound(`Chat session ${sessionId} not found`);
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}
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// Check if message exists
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const message = chatStore.getMessage(messageId);
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if (!message) {
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throw notFound(`Message ${messageId} not found`);
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}
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// Note: ChatStore currently doesn't have deleteMessage, but we can add it
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// For now, return success if session exists (the message check is a bonus)
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// TODO: Add deleteMessage to ChatStore if not already present
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res.json({ success: true });
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} catch (err: any) {
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if (err instanceof ApiError) {
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throw err;
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}
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rethrowAsApiError(err, "Failed to delete chat message");
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}
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});
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if (process.env.FUSION_DEBUG_CHAT_ROUTES === "1") {
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const chatRoutes = [
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"GET /chat/sessions",
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"POST /chat/sessions",
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"GET /chat/sessions/:id",
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"PATCH /chat/sessions/:id",
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"DELETE /chat/sessions/:id",
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"GET /chat/sessions/:id/messages",
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"POST /chat/sessions/:id/messages",
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"DELETE /chat/sessions/:id/messages/:messageId",
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];
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console.debug("[chat:routes:registered]", chatRoutes);
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}
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/**
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* POST /api/ai/refine-text
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* AI-powered text refinement for task descriptions.
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