// ---------------------------------------------------------------------------// Cloud MCP Session Durable Object — the cloud binding of the shared// `McpAgentSessionDOBase` (@executor-js/cloudflare). Direct HTTP 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 type * as Tracer from "effect/Tracer";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,  buildMcpServer,  mcpRequestStatePrincipal,  type PausedExecutionHooks,  type ResumeFallbackOutcome,} from "@executor-js/host-mcp/tool-server";import type { McpModernServerBuilder, Principal } from "@executor-js/host-mcp";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 BuiltModernMcpRuntime,  type IncomingTraceHeaders,  type McpApprovalOwner,  type McpSessionModelResumeResult,  type McpSessionInit,  type SessionMeta,} from "@executor-js/cloudflare/mcp/agent-durable-object";import { requireMcpRequestStateKey } from "@executor-js/cloudflare/mcp/modern-request-router";import {  mcpExecutionOwnerDirectoryFromNamespace,  type McpExecutionOwnerDirectory,  type McpExecutionOwnerRoute,} from "@executor-js/cloudflare/mcp/execution-owner-directory";import { mcpSessionStubForOwner } 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 { makeExecutionStack } from "../engine/execution-stack";import { preloadQuickJs } from "../quickjs";import { CloudMeteredExecutionStackLayer } from "../engine/execution-stack-metered";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;}> {} class CloudModernMcpBuildError extends Data.TaggedError("CloudModernMcpBuildError")<{  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),}); const resolveCloudSessionMeta = (token: McpSessionInit, dbHandle: CloudSessionDbHandle) =>  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,      webOrigin: token.webOrigin,    } satisfies SessionMeta;  }).pipe(Effect.provide(makeSessionServices(dbHandle))); const makeCloudExecutionRuntime = (sessionMeta: SessionMeta, dbHandle: CloudSessionDbHandle) =>  Effect.gen(function* () {    yield* Effect.promise(() => preloadQuickJs());    const { executor, engine } = yield* makeExecutionStack(      sessionMeta.userId,      sessionMeta.organizationId,      sessionMeta.organizationName,      { mcpResource: sessionMeta.resource },    ).pipe(      Effect.provide(CloudMeteredExecutionStackLayer.pipe(Layer.provide(AutumnService.Default))),      Effect.withSpan("McpSessionDOSqlite.makeExecutionStack"),    );    const description = yield* buildExecuteDescription(executor).pipe(      Effect.withSpan("mcp.execute.description.build"),    );    return { executor, engine, description };  }).pipe(Effect.provide(makeSessionServices(dbHandle))); type CloudExecutionRuntime = Effect.Success<ReturnType<typeof makeCloudExecutionRuntime>>; type CloudModernLifecycle = {  readonly pausedExecutionHooks?: PausedExecutionHooks;  readonly resumeFallback?: (    executionId: string,    response: ResumeResponse,  ) => Effect.Effect<ResumeFallbackOutcome | null, unknown>;  readonly parentSpan?: () => Tracer.AnySpan | undefined;}; const makeCloudModernRuntime = (  sessionMeta: SessionMeta,  runtime: CloudExecutionRuntime,  lifecycle: CloudModernLifecycle = {},): BuiltModernMcpRuntime => ({  engine: runtime.engine,  buildServer: (options) =>    buildMcpServer({      engine: runtime.engine,      description: runtime.description,      artifacts: runtime.executor.artifacts,      connections: runtime.executor.connections,      artifactsEnabled: sessionMeta.artifactsEnabled ?? true,      loadAppShellHtml,      smokeRenderArtifact,      artifactUrl: artifactUrlFor(        env.VITE_PUBLIC_SITE_URL ?? "https://executor.sh",        sessionMeta.organizationSlug,      ),      debug: env.EXECUTOR_MCP_DEBUG === "true",      elicitationMode: { mode: "native" },      ...(lifecycle.parentSpan ? { parentSpan: lifecycle.parentSpan } : {}),      ...(lifecycle.pausedExecutionHooks        ? {            pausedExecutionHooks: lifecycle.pausedExecutionHooks,            pausedExecutionLeaseMs: PAUSED_APPROVAL_TIMEOUT_MS,          }        : {}),      ...(lifecycle.resumeFallback ? { resumeFallback: lifecycle.resumeFallback } : {}),      ...options,    }),}); const closeModernServerWithDb = <Server extends { close: () => Promise<void> }>(  server: Server,  dbHandle: CloudSessionDbHandle,): Server => {  const closeServer = server.close.bind(server);  server.close = () =>    Effect.runPromise(      Effect.promise(closeServer).pipe(Effect.ensuring(Effect.promise(() => dbHandle.end()))),    );  return server;}; /** Build one worker-side stateless MCP server over a fresh cloud runtime. */export const makeCloudModernMcpServerBuilder = (  session: McpSessionInit,): McpModernServerBuilder["Service"] => ({  build: (principal: Principal, options) => {    const dbHandle = makeEphemeralDb();    const { resource, ...requestOptions } = options;    const token: McpSessionInit = {      ...session,      userId: principal.accountId,      organizationId: principal.organizationId,      resource,    };    return resolveCloudSessionMeta(token, dbHandle).pipe(      Effect.flatMap((sessionMeta) =>        makeCloudExecutionRuntime(sessionMeta, dbHandle).pipe(          Effect.map((runtime) => ({ runtime, sessionMeta })),        ),      ),      Effect.flatMap(({ runtime, sessionMeta }) =>        makeCloudModernRuntime(sessionMeta, runtime).buildServer(requestOptions),      ),      Effect.map((server) => closeModernServerWithDb(server, dbHandle)),      Effect.tapCause(() => Effect.promise(() => dbHandle.end())),      Effect.mapError((cause) => new CloudModernMcpBuildError({ cause })),    );  },}); // ---------------------------------------------------------------------------// 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> {    const ownerSession = mcpSessionStubForOwner(env.MCP_SESSION, owner);    if (!ownerSession) {      return Effect.succeed({ status: "execution_expired", ttlMs: PAUSED_APPROVAL_TIMEOUT_MS });    }    return Effect.tryPromise({      try: () => ownerSession.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 resolveCloudSessionMeta(token, dbHandle).pipe(      Effect.withSpan("McpSessionDOSqlite.resolveSessionMeta"),      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* () {      const runtime = yield* makeCloudExecutionRuntime(sessionMeta, dbHandle);      const { executor, engine, description } = runtime;      const modernRuntime = makeCloudModernRuntime(sessionMeta, runtime, {        pausedExecutionHooks: self.modernPausedExecutionHooks,        resumeFallback: self.modernModelResumeFallback,        parentSpan: () => self.currentParentSpan(),      });      const sessionElicitationMode = sessionMeta.elicitationMode ?? "model";      const mcpServer = yield* buildMcpServer({        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),        // Same restore contract for the client identity that keys the        // `mcp.client.*` span attribution on execution spans.        ...(sessionMeta.clientInfo ? { restoredClientInfo: sessionMeta.clientInfo } : {}),        onClientInfoChange: (clientInfo) => self.persistClientInfo(clientInfo),        appsEnabled: false,        sessionful: true,        requestStateSigningKey: self.modernRequestStateSigningKey(),        requestStatePrincipal: mcpRequestStatePrincipal({          accountId: sessionMeta.userId,          organizationId: sessionMeta.organizationId,        }),        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.buildMcpServer"));      return { mcpServer, engine, modernRuntime } satisfies BuiltMcpServer;    }).pipe(      Effect.withSpan("McpSessionDOSqlite.buildMcpServer"),      // 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 buildModernMcpRuntime(    sessionMeta: SessionMeta,    dbHandle: CloudSessionDbHandle,  ): Effect.Effect<BuiltModernMcpRuntime> {    const self = this;    return makeCloudExecutionRuntime(sessionMeta, dbHandle).pipe(      Effect.map((runtime) =>        makeCloudModernRuntime(sessionMeta, runtime, {          pausedExecutionHooks: self.modernPausedExecutionHooks,          resumeFallback: self.modernModelResumeFallback,          parentSpan: () => self.currentParentSpan(),        }),      ),      Effect.withSpan("McpSessionDOSqlite.buildModernMcpRuntime"),      // oxlint-disable-next-line executor/no-effect-escape-hatch -- boundary: runtime-build failures surface through the base RPC cleanup path      Effect.orDie,    );  }   protected override modernRequestStateSigningKey(): string {    return requireMcpRequestStateKey(env.MCP_REQUEST_STATE_KEY);  }   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();  }}