import {  type ServerConfig,  type ServerConfigStreamEvent,  WsSubscribeServerConfigRpc,  WS_METHODS,} from "@t3tools/contracts";import * as Cause from "effect/Cause";import * as Context from "effect/Context";import * as Deferred from "effect/Deferred";import * as Effect from "effect/Effect";import * as Equal from "effect/Equal";import * as Exit from "effect/Exit";import * as Layer from "effect/Layer";import * as Option from "effect/Option";import * as PubSub from "effect/PubSub";import * as Ref from "effect/Ref";import * as Schedule from "effect/Schedule";import * as Schema from "effect/Schema";import type * as Scope from "effect/Scope";import * as Stream from "effect/Stream";import type * as Rpc from "effect/unstable/rpc/Rpc";import * as RpcClient from "effect/unstable/rpc/RpcClient";import * as RpcClientError from "effect/unstable/rpc/RpcClientError";import * as RpcSerialization from "effect/unstable/rpc/RpcSerialization";import * as Socket from "effect/unstable/socket/Socket"; import { makeWsRpcProtocolClient, type WsRpcProtocolClient } from "./protocol.ts";import { NETWORK_BLOCKING_HINT } from "../errors/network.ts";import type {  ConnectionAttemptError,  ConnectionTransientError,  PreparedConnection,} from "../connection/model.ts";import {  ConnectionBlockedError,  ConnectionTransientError as ConnectionTransientErrorClass,} from "../connection/model.ts";import {  applyServerConfigProjection,  type ServerConfigProjection,  withoutEnvironmentThemes,} from "../state/serverConfigProjection.ts"; const SOCKET_OPEN_TIMEOUT = "15 seconds"; export interface RpcSession {  readonly client: WsRpcProtocolClient;  readonly initialConfig: Effect.Effect<ServerConfig, ConnectionAttemptError>;  readonly subscribeServerConfig: (    input: ServerConfigSubscriptionInput,  ) => ServerConfigSubscription;  readonly ready: Effect.Effect<void, ConnectionAttemptError>;  readonly probe: Effect.Effect<void, ConnectionAttemptError>;  readonly closed: Effect.Effect<never, ConnectionAttemptError>;} export interface RpcSessionOptions {  readonly environmentThemes?: boolean;  readonly usageLimitSources?: boolean;  /** This client answers /usage-limits itself, so the server may advertise it. */  readonly usageLimitsCommand?: boolean;} export class RpcSessionFactory extends Context.Service<  RpcSessionFactory,  {    readonly connect: (      connection: PreparedConnection,    ) => Effect.Effect<RpcSession, ConnectionAttemptError, Scope.Scope>;  }>()("@t3tools/client-runtime/rpc/session/RpcSessionFactory") {} type InitialConfigError = Effect.Error<  ReturnType<WsRpcProtocolClient[typeof WS_METHODS.serverGetConfig]>>;type ProbeError = Effect.Error<ReturnType<WsRpcProtocolClient[typeof WS_METHODS.serverProbe]>>;type ServerConfigSubscriptionError =  | Rpc.ErrorExit<typeof WsSubscribeServerConfigRpc>  | RpcClientError.RpcClientError;type ServerConfigSubscription = Stream.Stream<  ServerConfigStreamEvent,  ServerConfigSubscriptionError>;type ServerConfigSubscriptionInput = Parameters<  WsRpcProtocolClient[typeof WS_METHODS.subscribeServerConfig]>[0];type EnvironmentThemesUpdatedEvent = Extract<  ServerConfigStreamEvent,  { readonly type: "environmentThemesUpdated" }>;type UsageLimitSourcesUpdatedEvent = Extract<  ServerConfigStreamEvent,  { readonly type: "usageLimitSourcesUpdated" }>; interface ServerConfigReplayState {  readonly projection: ServerConfigProjection;  readonly revision: number;  readonly themesEvent: EnvironmentThemesUpdatedEvent | undefined;  readonly sourcesEvent: UsageLimitSourcesUpdatedEvent | undefined;} interface BufferedServerConfigEvent {  readonly event: ServerConfigStreamEvent;  readonly replay: ServerConfigReplayState;  readonly revision: number;} function serverConfigReplayEvents(  state: ServerConfigReplayState,): ReadonlyArray<ServerConfigStreamEvent> {  const snapshot = {    version: 1 as const,    type: "snapshot" as const,    config: withoutEnvironmentThemes(state.projection.config),  };  return [    snapshot,    ...(state.themesEvent === undefined ? [] : [state.themesEvent]),    ...(state.sourcesEvent === undefined ? [] : [state.sourcesEvent]),  ];} const isSocketErrorReason = Schema.is(Socket.SocketErrorReason); function mapSessionRpcError(  error: InitialConfigError | ProbeError | ServerConfigSubscriptionError,  networkHint: string,): ConnectionAttemptError {  switch (error._tag) {    case "EnvironmentAuthorizationError":      return new ConnectionBlockedError({        reason: "permission",        detail: error.message,      });    case "KeybindingsConfigParseError":    case "ServerSettingsError":      return new ConnectionTransientErrorClass({        reason: "remote-unavailable",        detail: error.message,      });    case "RpcClientError":      return new ConnectionTransientErrorClass({        reason: "transport",        detail: `${error.message}${isSocketErrorReason(error.reason) ? networkHint : ""}`,      });  }} /** @public Service construction is part of the canonical Effect module API. */export const make = Effect.fn("RpcSessionFactory.make")(function* (  options: RpcSessionOptions = {},) {  const webSocketConstructor = yield* Socket.WebSocketConstructor;  const serverConfigInput: ServerConfigSubscriptionInput = {    ...(options.environmentThemes === true ? { environmentThemes: true } : {}),    ...(options.usageLimitSources === true ? { usageLimitSources: true } : {}),    ...(options.usageLimitsCommand === true ? { usageLimitsCommand: true } : {}),  };   const connect = Effect.fnUntraced(function* (connection: PreparedConnection) {    const networkHint =      connection.target._tag === "RelayConnectionTarget" ? ` ${NETWORK_BLOCKING_HINT}` : "";    const mapRpcError = (error: Parameters<typeof mapSessionRpcError>[0]) =>      mapSessionRpcError(error, networkHint);    yield* Effect.annotateCurrentSpan({      "connection.environment.id": connection.environmentId,    });     const connected = yield* Deferred.make<void>();    const disconnected = yield* Deferred.make<never, ConnectionTransientError>();    const hooks = RpcClient.ConnectionHooks.of({      onConnect: Deferred.succeed(connected, undefined).pipe(Effect.asVoid),      onDisconnect: Deferred.isDone(connected).pipe(        Effect.flatMap((wasConnected) =>          Deferred.fail(            disconnected,            new ConnectionTransientErrorClass({              reason: "transport",              detail: `${                wasConnected                  ? `${connection.label} disconnected.`                  : `${connection.label} could not establish a WebSocket connection.`              }${networkHint}`,            }),          ),        ),        Effect.asVoid,      ),    });    const socketLayer = Socket.layerWebSocket(connection.socketUrl, {      openTimeout: SOCKET_OPEN_TIMEOUT,    }).pipe(Layer.provide(Layer.succeed(Socket.WebSocketConstructor, webSocketConstructor)));    const protocolLayer = Layer.effect(      RpcClient.Protocol,      RpcClient.makeProtocolSocket({        retryTransientErrors: false,        retryPolicy: Schedule.recurs(0),      }),    ).pipe(      Layer.provide(        Layer.mergeAll(          socketLayer,          RpcSerialization.layerJson,          Layer.succeed(RpcClient.ConnectionHooks, hooks),        ),      ),    );    const protocolContext = yield* Layer.build(protocolLayer).pipe(      Effect.withSpan("environment.websocket.connect"),    );    const protocolClient = yield* makeWsRpcProtocolClient.pipe(Effect.provide(protocolContext));    const initialConfigDeferred = yield* Deferred.make<ServerConfig>();    const serverConfigExit = yield* Deferred.make<void, ServerConfigSubscriptionError>();    const configSubscriptionClosed = yield* Deferred.make<never, ConnectionAttemptError>();    const serverConfigState = yield* Ref.make(Option.none<ServerConfigReplayState>());    const serverConfigUpdates = yield* PubSub.sliding<BufferedServerConfigEvent>(64);    const configSubscriptionEndedError = new ConnectionTransientErrorClass({      reason: "remote-unavailable",      detail: `${connection.label} config subscription ended.`,    });    const serverConfigSource = protocolClient[WS_METHODS.subscribeServerConfig](      serverConfigInput,    ).pipe(      Stream.runForEach((event) =>        Effect.gen(function* () {          const buffered = yield* Ref.modify(serverConfigState, (current) => {            const projection = applyServerConfigProjection(              Option.map(current, (state) => state.projection),              event,            );            if (Option.isNone(projection)) {              return [Option.none<BufferedServerConfigEvent>(), current] as const;            }            const next = {              projection: projection.value,              revision: Option.match(current, {                onNone: () => 1,                onSome: (state) => state.revision + 1,              }),              themesEvent:                event.type === "environmentThemesUpdated"                  ? event                  : event.type === "snapshot" &&                      event.config.environment.capabilities.environmentThemes !== true                    ? undefined                    : Option.getOrUndefined(current)?.themesEvent,              sourcesEvent:                event.type === "usageLimitSourcesUpdated"                  ? event                  : event.type === "snapshot" &&                      event.config.environment.capabilities.usageLimitSources !== true                    ? undefined                    : Option.getOrUndefined(current)?.sourcesEvent,            } satisfies ServerConfigReplayState;            return [              Option.some({ event, replay: next, revision: next.revision }),              Option.some(next),            ] as const;          });          if (Option.isSome(buffered)) {            yield* PubSub.publish(serverConfigUpdates, buffered.value);          }          if (event.type === "snapshot") {            yield* Deferred.succeed(initialConfigDeferred, event.config);          }        }),      ),      Effect.onExit((exit) => {        if (Exit.isSuccess(exit)) {          return Effect.all([            Deferred.succeed(serverConfigExit, undefined),            Deferred.fail(configSubscriptionClosed, configSubscriptionEndedError),          ]).pipe(Effect.asVoid);        }        if (Cause.hasInterruptsOnly(exit.cause)) {          return Effect.void;        }        return Effect.all([          Deferred.failCause(serverConfigExit, exit.cause),          Deferred.failCause(configSubscriptionClosed, Cause.map(exit.cause, mapRpcError)),        ]).pipe(Effect.asVoid);      }),    );    yield* serverConfigSource.pipe(Effect.forkScoped);    const initialConfig = Effect.raceFirst(      Deferred.await(initialConfigDeferred),      Deferred.await(serverConfigExit).pipe(        Effect.mapError(mapRpcError),        Effect.flatMap(() => Effect.fail(configSubscriptionEndedError)),      ),    ).pipe(Effect.withSpan("environment.initialSync"));    const serverConfigEvents = Stream.unwrap(      Effect.gen(function* () {        const subscription = yield* PubSub.subscribe(serverConfigUpdates);        yield* Effect.raceFirst(          Deferred.await(initialConfigDeferred).pipe(Effect.asVoid),          Deferred.await(serverConfigExit),        );        const snapshot = yield* Ref.get(serverConfigState);        if (Option.isNone(snapshot)) {          return Stream.empty;        }        const updates = Stream.fromSubscription(subscription).pipe(          Stream.filter((buffered) => buffered.revision > snapshot.value.revision),          Stream.mapAccum(            () => snapshot.value.revision,            (revision, buffered) => [              buffered.revision,              buffered.revision === revision + 1                ? [buffered.event]                : serverConfigReplayEvents(buffered.replay),            ],          ),        );        const terminal = Stream.fromEffect(Deferred.await(serverConfigExit)).pipe(Stream.drain);        return Stream.concat(          Stream.fromIterable(serverConfigReplayEvents(snapshot.value)),          Stream.merge(updates, terminal, { haltStrategy: "either" }),        );      }),    ).pipe(      Stream.catchCause((cause) => {        if (Cause.hasInterruptsOnly(cause)) {          return Stream.failCause(cause);        }        // The supervisor keeps the original cause. Shared durable consumers        // need a transport-shaped failure so they wait for its replacement.        return Stream.fail(          new RpcClientError.RpcClientError({            reason: new RpcClientError.RpcClientDefect({              message: `${connection.label} config subscription failed.`,              cause,            }),          }),        );      }),    );    const subscribeServerConfig = (input: ServerConfigSubscriptionInput) =>      Equal.equals(input, serverConfigInput)        ? serverConfigEvents        : protocolClient[WS_METHODS.subscribeServerConfig](input);    const probe = initialConfig.pipe(      Effect.flatMap((config) =>        (config.environment.capabilities.connectionProbe === true          ? protocolClient[WS_METHODS.serverProbe]({})          : protocolClient[WS_METHODS.serverGetConfig]({})        ).pipe(Effect.mapError(mapRpcError)),      ),      Effect.asVoid,      Effect.withSpan("clientRuntime.connection.rpcSession.probe"),    );     return {      client: protocolClient,      initialConfig,      subscribeServerConfig,      ready: Deferred.await(connected).pipe(        Effect.andThen(initialConfig),        Effect.asVoid,        Effect.raceFirst(Deferred.await(disconnected)),      ),      probe,      closed: Effect.raceFirst(        Deferred.await(disconnected),        Deferred.await(configSubscriptionClosed),      ),    } satisfies RpcSession;  });   return RpcSessionFactory.of({ connect });}); export const layerWithOptions = (options: RpcSessionOptions) =>  Layer.effect(RpcSessionFactory, make(options));