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Copy pathhandler.ts
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417 lines (382 loc) · 11.7 KB
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// LSP compatibility handler backed by the shared app-server protocol client.
import { fileURLToPath } from 'node:url';
import { SpawnedAppServerConnection } from '@deepcode/app-server/client';
import {
ProtocolClient,
type ConfigDiagnosticsResult,
type InitializeResult,
type ProtocolEvent,
type ProtocolMethod,
type ThreadSnapshot,
type TurnSnapshot,
} from '@deepcode/protocol';
export interface LspMessage {
jsonrpc: '2.0';
id?: number | string | null;
method?: string;
params?: unknown;
result?: unknown;
error?: { code: number; message: string; data?: unknown };
}
export type SendFn = (msg: LspMessage) => void;
interface AppServerClient {
connect(): Promise<InitializeResult>;
request<T>(method: ProtocolMethod, params?: Record<string, unknown>): Promise<T>;
subscribe(handler: (event: ProtocolEvent) => void): () => void;
close(): Promise<void>;
}
interface ServerState {
initialized: boolean;
rootUri?: string;
threadId?: string;
client?: AppServerClient;
unsubscribe?: () => void;
clientFactory: () => AppServerClient;
activeTurns: Map<string, string>;
turnSinks: Map<string, SendFn>;
queuedEvents: Map<string, ProtocolEvent[]>;
latestSend?: SendFn;
}
const state: ServerState = {
initialized: false,
clientFactory: () => new ProtocolClient(new SpawnedAppServerConnection()),
activeTurns: new Map(),
turnSinks: new Map(),
queuedEvents: new Map(),
};
const SERVER_INFO = {
name: 'deepcode-lsp',
version: '0.0.0',
};
const COMMANDS = [
'deepcode.runAgent',
'deepcode.abort',
'deepcode.readThread',
'deepcode.resumeThread',
'deepcode.respondApproval',
'deepcode.respondUserInput',
'deepcode.listSkills',
'deepcode.configDiagnostics',
];
export async function handleMessage(msg: LspMessage, send: SendFn): Promise<void> {
if (msg.id === undefined || msg.id === null) {
await handleNotification(msg);
return;
}
try {
const result = await dispatch(msg, send);
send({ jsonrpc: '2.0', id: msg.id, result });
} catch (error) {
send({
jsonrpc: '2.0',
id: msg.id,
error: { code: -32603, message: (error as Error).message },
});
}
}
async function handleNotification(msg: LspMessage): Promise<void> {
switch (msg.method) {
case 'initialized':
state.initialized = true;
return;
case 'exit':
await closeClient();
process.exit(state.initialized ? 0 : 1);
return;
default:
return;
}
}
async function dispatch(msg: LspMessage, send: SendFn): Promise<unknown> {
switch (msg.method) {
case 'initialize':
return handleInitialize(msg.params as { rootUri?: string });
case 'shutdown':
await closeClient();
return null;
case 'workspace/executeCommand':
return handleExecuteCommand(msg.params as ExecuteCommandParams, send);
default:
throw new Error(`Method not supported: ${msg.method ?? '<missing>'}`);
}
}
function handleInitialize(params: { rootUri?: string }): unknown {
state.rootUri = params?.rootUri;
return {
capabilities: {
executeCommandProvider: { commands: COMMANDS },
textDocumentSync: 0,
},
serverInfo: SERVER_INFO,
};
}
interface ExecuteCommandParams {
command: string;
arguments?: unknown[];
}
async function handleExecuteCommand(params: ExecuteCommandParams, send: SendFn): Promise<unknown> {
state.latestSend = send;
switch (params.command) {
case 'deepcode.runAgent':
return handleRunAgent(
(params.arguments?.[0] ?? {}) as {
prompt?: string;
model?: string;
effort?: string;
mode?: string;
threadId?: string;
},
send,
);
case 'deepcode.abort':
return handleAbort((params.arguments?.[0] ?? {}) as { turnId?: string });
case 'deepcode.readThread':
return handleReadThread((params.arguments?.[0] ?? {}) as { threadId?: string });
case 'deepcode.resumeThread':
return handleResumeThread((params.arguments?.[0] ?? {}) as { threadId?: string });
case 'deepcode.respondApproval':
return handleApproval(
(params.arguments?.[0] ?? {}) as {
turnId?: string;
requestId?: string;
decision?: 'allow' | 'deny' | 'always';
},
);
case 'deepcode.respondUserInput':
return handleUserInput(
(params.arguments?.[0] ?? {}) as {
turnId?: string;
requestId?: string;
answer?: string;
},
);
case 'deepcode.listSkills':
return handleListSkills();
case 'deepcode.configDiagnostics':
return handleConfigDiagnostics();
default:
throw new Error(`Unknown command: ${params.command}`);
}
}
async function handleRunAgent(
args: {
prompt?: string;
model?: string;
effort?: string;
mode?: string;
threadId?: string;
},
send: SendFn,
): Promise<{ threadId: string; turnId: string }> {
if (!args.prompt) throw new Error('prompt is required');
const client = await getClient();
const thread = await ensureThread(client, args.threadId);
const turn = await client.request<TurnSnapshot>('turn/start', {
threadId: thread.id,
input: {
text: args.prompt,
...(args.model ? { model: args.model } : {}),
...(args.effort ? { effort: args.effort } : {}),
...(args.mode ? { mode: args.mode } : {}),
},
});
state.activeTurns.set(turn.id, thread.id);
state.turnSinks.set(turn.id, send);
flushEvents(turn.id);
return { threadId: thread.id, turnId: turn.id };
}
async function handleAbort(args: { turnId?: string }): Promise<{ aborted: boolean }> {
if (!args.turnId) throw new Error('turnId is required');
const threadId = state.activeTurns.get(args.turnId);
if (!threadId) return { aborted: false };
const client = await getClient();
const result = await client.request<{ interrupted: boolean }>('turn/interrupt', {
threadId,
turnId: args.turnId,
});
return { aborted: result.interrupted };
}
async function handleReadThread(args: { threadId?: string }): Promise<ThreadSnapshot> {
if (!args.threadId) throw new Error('threadId is required');
return (await getClient()).request<ThreadSnapshot>('thread/read', { threadId: args.threadId });
}
async function handleResumeThread(args: { threadId?: string }): Promise<ThreadSnapshot> {
if (!args.threadId) throw new Error('threadId is required');
const thread = await (
await getClient()
).request<ThreadSnapshot>('thread/resume', {
threadId: args.threadId,
});
state.threadId = thread.id;
return thread;
}
async function handleApproval(args: {
turnId?: string;
requestId?: string;
decision?: 'allow' | 'deny' | 'always';
}): Promise<{ accepted: boolean }> {
const { threadId, turnId, requestId } = interactionContext(args);
if (!args.decision) throw new Error('decision is required');
return (await getClient()).request('approval/respond', {
threadId,
turnId,
requestId,
decision: args.decision,
});
}
async function handleUserInput(args: {
turnId?: string;
requestId?: string;
answer?: string;
}): Promise<{ accepted: boolean }> {
const { threadId, turnId, requestId } = interactionContext(args);
if (args.answer === undefined) throw new Error('answer is required');
return (await getClient()).request('user-input/respond', {
threadId,
turnId,
requestId,
answer: args.answer,
});
}
function interactionContext(args: { turnId?: string; requestId?: string }) {
if (!args.turnId) throw new Error('turnId is required');
if (!args.requestId) throw new Error('requestId is required');
const threadId = state.activeTurns.get(args.turnId);
if (!threadId) throw new Error(`Active turn not found: ${args.turnId}`);
return { threadId, turnId: args.turnId, requestId: args.requestId };
}
async function getClient(): Promise<AppServerClient> {
if (!state.client) {
const client = state.clientFactory();
state.client = client;
state.unsubscribe = client.subscribe(routeEvent);
}
await state.client.connect();
return state.client;
}
async function ensureThread(
client: AppServerClient,
requestedThreadId?: string,
): Promise<ThreadSnapshot> {
if (requestedThreadId && requestedThreadId !== state.threadId) {
const thread = await client.request<ThreadSnapshot>('thread/resume', {
threadId: requestedThreadId,
});
state.threadId = thread.id;
return thread;
}
if (state.threadId) {
return client.request<ThreadSnapshot>('thread/read', { threadId: state.threadId });
}
const thread = await client.request<ThreadSnapshot>('thread/start', { cwd: workspacePath() });
state.threadId = thread.id;
return thread;
}
function routeEvent(event: ProtocolEvent): void {
const turnId = turnIdFrom(event);
if (!turnId) {
state.latestSend?.({ jsonrpc: '2.0', method: 'deepcode/protocolEvent', params: event });
return;
}
const send = state.turnSinks.get(turnId);
if (!send) {
const queued = state.queuedEvents.get(turnId) ?? [];
queued.push(event);
state.queuedEvents.set(turnId, queued);
return;
}
sendProtocolEvent(send, event);
}
function flushEvents(turnId: string): void {
const send = state.turnSinks.get(turnId);
if (!send) return;
const events = state.queuedEvents.get(turnId) ?? [];
state.queuedEvents.delete(turnId);
for (const event of events) sendProtocolEvent(send, event);
}
function sendProtocolEvent(send: SendFn, event: ProtocolEvent): void {
send({ jsonrpc: '2.0', method: 'deepcode/protocolEvent', params: event });
if (isTerminal(event)) {
const turnId = event.turn.id;
state.activeTurns.delete(turnId);
state.turnSinks.delete(turnId);
state.queuedEvents.delete(turnId);
}
}
function turnIdFrom(event: ProtocolEvent): string | undefined {
if (event.type === 'thread.started') return undefined;
if (
event.type === 'turn.started' ||
event.type === 'turn.completed' ||
event.type === 'turn.interrupted' ||
event.type === 'turn.failed'
) {
return event.turn.id;
}
return event.turnId;
}
function isTerminal(
event: ProtocolEvent,
): event is Extract<
ProtocolEvent,
{ type: 'turn.completed' | 'turn.interrupted' | 'turn.failed' }
> {
return (
event.type === 'turn.completed' ||
event.type === 'turn.interrupted' ||
event.type === 'turn.failed'
);
}
function workspacePath(): string {
if (!state.rootUri) return process.cwd();
try {
return fileURLToPath(state.rootUri);
} catch {
return process.cwd();
}
}
async function closeClient(): Promise<void> {
state.unsubscribe?.();
state.unsubscribe = undefined;
const client = state.client;
state.client = undefined;
state.threadId = undefined;
state.activeTurns.clear();
state.turnSinks.clear();
state.queuedEvents.clear();
if (client) await client.close();
}
async function handleListSkills(): Promise<{ skills: unknown[] }> {
const { loadSkills } = await import('@deepcode/core');
const skills = await loadSkills({ cwd: workspacePath() });
return {
skills: skills.map((skill) => ({
name: skill.qualifiedName,
description: skill.frontmatter.description,
source: skill.source,
path: skill.path,
})),
};
}
async function handleConfigDiagnostics(): Promise<ConfigDiagnosticsResult> {
const client = await getClient();
const initialized = await client.connect();
if (!initialized.capabilities.configDiagnostics) {
throw new Error('The app-server does not support configuration diagnostics');
}
return client.request('config/diagnostics', { cwd: workspacePath() });
}
export const __test = {
state,
dispatch,
setClientFactory(factory: () => AppServerClient) {
state.clientFactory = factory;
},
async reset() {
await closeClient();
state.initialized = false;
state.rootUri = undefined;
state.latestSend = undefined;
state.clientFactory = () => new ProtocolClient(new SpawnedAppServerConnection());
},
};