// ---------------------------------------------------------------------------// Cloud MCP Session Durable Object — the cloud binding of the shared// `McpAgentSessionDOBase` (@executor-js/cloudflare). Hibernatable transport// serving, cold restore, the inactivity alarm, owner validation, browser// approval storage, and the per-request span bridge live in the base. Cloud// supplies ONLY its injected dependencies://   - openSessionDb     → a long-lived postgres.js handle//   - resolveSessionMeta → WorkOS/UserStore organization resolution//   - buildMcpServer    → the cloud execution stack + MCP tool server//   - withTelemetry     → the WebSdk tracer + W3C parent-span stitching//   - captureCause      → Sentry error capture// host-cloudflare binds the same base to D1 instead; the two stay byte-identical// except for these seams.// --------------------------------------------------------------------------- import { env } from "cloudflare:workers";import { Data, Effect, Layer } from "effect";import type { Cause } from "effect";import * as OtelTracer from "@effect/opentelemetry/Tracer";import { drizzle } from "drizzle-orm/postgres-js";import postgres, { type Sql } from "postgres"; import {  PAUSED_APPROVAL_TIMEOUT_MS,  createExecutorMcpServer,} from "@executor-js/host-mcp/tool-server";import { buildResumeApprovalUrl } from "@executor-js/host-mcp/browser-approval";import { artifactUrlFor } from "@executor-js/host-mcp/create-artifact";import { makeAssetsShellHtmlLoader } from "@executor-js/mcp-apps-shell/worker";import { smokeRenderArtifact } from "@executor-js/mcp-apps-shell/smoke-render";import {  McpAgentSessionDOBase,  type BuiltMcpServer,  type IncomingTraceHeaders,  type McpApprovalOwner,  type McpSessionModelResumeResult,  type McpSessionInit,  type SessionMeta,} from "@executor-js/cloudflare/mcp/agent-durable-object";import {  mcpExecutionOwnerDirectoryFromNamespace,  type McpExecutionOwnerDirectory,  type McpExecutionOwnerRoute,} from "@executor-js/cloudflare/mcp/execution-owner-directory";import { mcpSessionStub } from "@executor-js/cloudflare/mcp/session-stub";import { buildExecuteDescription, type ResumeResponse } from "@executor-js/execution"; // The DO meters executions just like the HTTP `/api/*` plane: it builds its// engine with `CloudMeteredExecutionStackLayer`, so every MCP execution is// tracked to Autumn (the MCP server is the primary execution surface, so leaving// it unmetered silently dropped the bulk of real usage). The billing service// (`AutumnService.Default`) is provided LOCALLY to the metered stack below, so// the DO still imports the focused `CoreSharedServices` root (beside// `WorkOSClient`), NOT `../api/layers`, and its bundle stays free of the whole// HTTP API assembly. (This used to require a dedicated `core-shared-services.ts`// leaf to keep `auth/handlers.ts` -> `@tanstack/react-start` out of the DO// bundle; that coupling is gone now that `handlers.ts` queues cookies through// `SessionAuthLive` instead.)import { CoreSharedServices } from "../auth/workos";import { UserStoreService } from "../auth/context";import { resolveOrganization } from "../auth/organization";import {  DbService,  combinedSchema,  resolveConnectionString,  type DrizzleDb,  type DbServiceShape,} from "../db/db";import { AutumnService } from "../extensions/billing/service";import { DoTelemetryLive, flushTracerProvider } from "../observability/telemetry";import {  captureCause as reportCause,  captureCauseEffect as reportCauseEffect,  tagCurrentSentryScopeWithCurrentOtelSpan,} from "../observability";import { parseTraceparent } from "./traceparent"; // Re-export the shared types so existing cloud importers// (`auth/handlers.ts`, etc.) keep their `../mcp/session-durable-object` path.export type {  McpApprovalOwner,  McpSessionApprovalResult,  McpSessionModelResumeResult,  McpSessionResumeApprovalResult,  McpSessionInit,  IncomingTraceHeaders,} from "@executor-js/cloudflare/mcp/agent-durable-object"; // ---------------------------------------------------------------------------// Cloud DB handle — one postgres.js client per session runtime// --------------------------------------------------------------------------- const LONG_LIVED_DB_IDLE_TIMEOUT_SECONDS = 5;const LONG_LIVED_DB_MAX_LIFETIME_SECONDS = 120;const TELEMETRY_FLUSH_TIMEOUT_MS = 1_000; const positiveMilliseconds = (raw: string | undefined): number | undefined => {  if (!raw) return undefined;  const parsed = Number(raw);  if (!Number.isFinite(parsed) || parsed <= 0) return undefined;  return Math.floor(parsed);}; type CloudSessionDbHandle = DbServiceShape & {  readonly sql: Sql;  readonly end: () => Promise<void>;}; class OrganizationNotFoundError extends Data.TaggedError("OrganizationNotFoundError")<{  readonly organizationId: string;}> {} class McpModelResumeForwardError extends Data.TaggedError("McpModelResumeForwardError")<{  readonly cause: unknown;}> {} /** * The DO keeps one postgres.js client for the MCP session runtime. postgres.js * closes idle sockets quickly, while the runtime object stays alive so the MCP * server can preserve session-local protocol state across requests. */const makeDbHandle = (options: {  readonly idleTimeout: number;  readonly maxLifetime: number;}): CloudSessionDbHandle => {  const sql = postgres(resolveConnectionString(), {    max: 1,    idle_timeout: options.idleTimeout,    max_lifetime: options.maxLifetime,    connect_timeout: 10,    fetch_types: false,    prepare: true,    onnotice: () => undefined,  });  return {    sql,    db: drizzle(sql, { schema: combinedSchema }) as DrizzleDb,    // oxlint-disable-next-line executor/no-promise-catch -- boundary: postgres.js close is best-effort during DO/runtime cleanup    end: () => sql.end({ timeout: 0 }).catch(() => undefined),  };}; const makeEphemeralDb = (): CloudSessionDbHandle =>  makeDbHandle({ idleTimeout: 0, maxLifetime: 60 }); // The org-resolution + session-runtime services. They DON'T re-provide// `DoTelemetryLive` — that would install a second WebSdk tracer in the nested// Effect scope, disconnecting every child span from the outer DO-method trace.// Tracer comes from the outermost `withTelemetry` at the DO method boundary.const makeSessionServices = (dbHandle: CloudSessionDbHandle) => {  const DbLive = Layer.succeed(DbService)({ sql: dbHandle.sql, db: dbHandle.db });  const UserStoreLive = UserStoreService.Live.pipe(Layer.provide(DbLive));  return Layer.mergeAll(DbLive, UserStoreLive, CoreSharedServices);}; // The `ui://executor/shell.html` resource, over the ASSETS binding: the// deployed Worker has no filesystem, so the document is the stable-named// asset the client build emitted (`mcpAppsShellAsset`), fetched at first// artifact resource read. Module scope so the fetch-and-verify happens once// per isolate, not once per session. The dev thunk carries the built shell// inline under `vite dev`, where no assets exist yet for the binding to find.const loadAppShellHtml = makeAssetsShellHtmlLoader({  assets: env.ASSETS,  devShellHtml: () =>    import("virtual:executor-mcp-apps-shell-dev-html").then((mod) => mod.devShellHtml),}); // ---------------------------------------------------------------------------// Durable Object// --------------------------------------------------------------------------- export class McpSessionDOSqlite extends McpAgentSessionDOBase<Env, CloudSessionDbHandle> {  protected override sessionTimeoutMs(): number {    return positiveMilliseconds(env.MCP_SESSION_TIMEOUT_MS) ?? super.sessionTimeoutMs();  }   protected override maxPausedSessionIdleMs(): number {    return (      positiveMilliseconds(env.MCP_PAUSED_SESSION_IDLE_TIMEOUT_MS) ?? super.maxPausedSessionIdleMs()    );  }   protected override executionOwnerDirectory(): McpExecutionOwnerDirectory | null {    return mcpExecutionOwnerDirectoryFromNamespace(env.MCP_EXECUTION_OWNER);  }   protected override forwardModelResumeToOwner(    owner: McpExecutionOwnerRoute,    identity: McpApprovalOwner,    executionId: string,    response: ResumeResponse,  ): Effect.Effect<McpSessionModelResumeResult, unknown> {    return Effect.tryPromise({      try: () =>        mcpSessionStub(env.MCP_SESSION, owner.sessionId).resumeExecutionForModel(          executionId,          identity,          response,        ),      catch: (cause) => new McpModelResumeForwardError({ cause }),    });  }   protected override openSessionDb(): CloudSessionDbHandle {    return makeDbHandle({      idleTimeout: LONG_LIVED_DB_IDLE_TIMEOUT_SECONDS,      maxLifetime: LONG_LIVED_DB_MAX_LIFETIME_SECONDS,    });  }   protected override resolveSessionMeta(token: McpSessionInit): Effect.Effect<SessionMeta> {    const dbHandle = makeEphemeralDb();    return Effect.gen(function* () {      const org = yield* resolveOrganization(token.organizationId);      if (!org) {        return yield* new OrganizationNotFoundError({ organizationId: token.organizationId });      }      return {        organizationId: org.id,        organizationName: org.name,        organizationSlug: org.slug,        userId: token.userId,        resource: token.resource,        elicitationMode: token.elicitationMode,        artifactsEnabled: token.artifactsEnabled,      } satisfies SessionMeta;    }).pipe(      Effect.withSpan("McpSessionDOSqlite.resolveSessionMeta"),      Effect.provide(makeSessionServices(dbHandle)),      Effect.ensuring(Effect.promise(() => dbHandle.end())),      // oxlint-disable-next-line executor/no-effect-escape-hatch -- boundary: a vanished org is a defect; the worker already verified the bearer      Effect.orDie,    );  }   protected override buildMcpServer(    sessionMeta: SessionMeta,    dbHandle: CloudSessionDbHandle,  ): Effect.Effect<BuiltMcpServer> {    const self = this;    return Effect.gen(function* () {      // Imported here rather than at module scope. Cloudflare requires a      // Durable Object class to be exported from the Worker entry, so every      // static import this module makes is evaluated by *every* cold isolate —      // including the ones that only render a page or forward a passthrough      // proxy and never open an MCP session. These three roots pull the whole      // code-execution stack (sucrase, ajv, QuickJS-WASM): measured at 1.9 MB      // of the Worker's startup closure, for code only a real session runs.      // `apps/cloud/scripts/start-closure.mjs` reports that number and will      // show it moving back if these become static again.      const [{ preloadQuickJs }, { makeExecutionStack }, { CloudMeteredExecutionStackLayer }] =        yield* Effect.promise(          () =>            Promise.all([              import("../quickjs"),              import("../engine/execution-stack"),              import("../engine/execution-stack-metered"),            ]) as Promise<              [                typeof import("../quickjs"),                typeof import("../engine/execution-stack"),                typeof import("../engine/execution-stack-metered"),              ]            >,        );       // QuickJS-WASM must be loaded before anything asks for a sandbox: the      // default variant cannot fetch its own `.wasm` on Workers. Cloud runs      // user `execute` code on the dynamic-worker runtime, but the artifact      // smoke render is a QuickJS sandbox on every host — without this it fails      // open on each create and the check silently does nothing.      // Idempotent per isolate.      yield* Effect.promise(() => preloadQuickJs());      const { executor, engine } = yield* makeExecutionStack(        sessionMeta.userId,        sessionMeta.organizationId,        sessionMeta.organizationName,        { mcpResource: sessionMeta.resource },      ).pipe(        // The metered stack tracks each execution to Autumn. It requires        // `AutumnService | DbService`; `AutumnService.Default` is provided here        // (it only reads `env`, no further deps), and `DbService` flows from the        // outer `makeSessionServices`. When `AUTUMN_SECRET_KEY` is unset the        // billing service degrades to a no-op tracker, so this stays inert in        // cloud dev/preview environments that run without a billing backend.        Effect.provide(CloudMeteredExecutionStackLayer.pipe(Layer.provide(AutumnService.Default))),        Effect.withSpan("McpSessionDOSqlite.makeExecutionStack"),      );      // Build the description here so `executor.connections.list()` stays under      // the DO startup span and the MCP SDK receives a concrete string instead      // of invoking `engine.getDescription` across its async boundary.      const description = yield* buildExecuteDescription(executor).pipe(        Effect.withSpan("mcp.execute.description.build"),      );      const sessionElicitationMode = sessionMeta.elicitationMode ?? "model";      const mcpServer = yield* createExecutorMcpServer({        engine,        description,        artifacts: executor.artifacts,        connections: executor.connections,        // Artifacts are on by default, opt-out per connection. A session        // persisted without a value restores to the default, same as a fresh        // connection whose URL says nothing about `?artifacts=`.        artifactsEnabled: sessionMeta.artifactsEnabled ?? true,        // Cold restores rebuild this server with no `initialize` to replay, so        // the negotiated apps support comes back from storage instead.        restoredAppsEnabled: sessionMeta.appsEnabled ?? false,        onAppsEnabledChange: (appsEnabled) => self.persistAppsEnabled(appsEnabled),        loadAppShellHtml,        smokeRenderArtifact,        artifactUrl: artifactUrlFor(          env.VITE_PUBLIC_SITE_URL ?? "https://executor.sh",          sessionMeta.organizationSlug,        ),        parentSpan: () => self.currentParentSpan(),        debug: env.EXECUTOR_MCP_DEBUG === "true",        browserApprovalStore: self.browserApprovalStore,        pausedExecutionHooks: self.pausedExecutionHooks,        pausedExecutionLeaseMs: PAUSED_APPROVAL_TIMEOUT_MS,        resumeFallback: self.modelResumeFallback,        elicitationMode:          sessionElicitationMode === "browser"            ? {                mode: "browser" as const,                approvalUrl: (executionId) =>                  buildResumeApprovalUrl({                    origin: env.VITE_PUBLIC_SITE_URL ?? "https://executor.sh",                    executionId,                    sessionId: self.sessionId,                    organizationSlug: sessionMeta.organizationSlug,                  }),              }            : { mode: sessionElicitationMode },      }).pipe(Effect.withSpan("McpSessionDOSqlite.createExecutorMcpServer"));      return { mcpServer, engine } satisfies BuiltMcpServer;    }).pipe(      Effect.withSpan("McpSessionDOSqlite.buildMcpServer"),      Effect.provide(makeSessionServices(dbHandle)),      // oxlint-disable-next-line executor/no-effect-escape-hatch -- boundary: runtime-build failures surface as the base's tapCause/cleanup defect      Effect.orDie,    );  }   protected override withTelemetry<A, E>(    effect: Effect.Effect<A, E>,    incoming?: IncomingTraceHeaders,  ): Effect.Effect<A, E> {    const parsed = parseTraceparent(incoming?.traceparent, incoming?.tracestate);    const traced = parsed ? OtelTracer.withSpanContext(effect, parsed) : effect;    return traced.pipe(Effect.provide(DoTelemetryLive));  }   protected override captureCause(cause: Cause.Cause<unknown>): void {    reportCause(cause);  }   protected override captureCauseEffect(    cause: Cause.Cause<unknown>,  ): Effect.Effect<string | undefined> {    return reportCauseEffect(cause);  }   protected override prepareErrorCaptureScope(): Effect.Effect<void> {    return Effect.asVoid(tagCurrentSentryScopeWithCurrentOtelSpan);  }   // Best-effort export the DO isolate's buffered spans after the RPC settles,  // so a dying init/handleRequest can ship its own spans (and the exception +  // stack recorded on them) — not just the worker-side `mcp.do.*` span. Keep it  // off the response path and bounded: telemetry export must not hold a  // successful MCP response open.  protected override flushTelemetry(): Promise<void> {    this.ctx.waitUntil(      Effect.runPromise(        Effect.tryPromise({          try: () => flushTracerProvider(),          catch: () => undefined,        }).pipe(          Effect.ignore,          Effect.timeoutOrElse({            duration: `${TELEMETRY_FLUSH_TIMEOUT_MS} millis`,            orElse: () => Effect.void,          }),        ),      ),    );    return Promise.resolve();  }}