| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import { randomUUID } from 'node:crypto'; |
| import { ToolOutcomeUnknownError } from '@maka/core/events'; |
| import type { InteractionFormInput, InteractionFormResult } from '@maka/core/interaction'; |
| import { |
| CLIENT_CAPABILITY_MAX_RESULT_BYTES, |
| CLIENT_CAPABILITY_RESULT_CHUNK_MAX_BYTES, |
| decodeClientCapabilityResult, |
| type ClientCapabilityCallResult, |
| type ClientCapabilityAdmissionEvidence, |
| type ClientCapabilityClientFrame, |
| type ClientCapabilityHostFrame, |
| type ClientCapabilityHostPathAccess, |
| type ClientCapabilityToolDescriptor, |
| } from '../protocol/index.js'; |
| import type { ClientCapabilityConnectionSender } from './client-capability-service.js'; |
| |
| const MAX_CONCURRENT_INVOCATIONS_PER_CONNECTION = 8; |
| const MAX_RETIRED_INVOCATIONS = 1_024; |
| |
| export type ClientCapabilityInvocationFailure = |
| | 'capability_ambiguous' |
| | 'capability_lost' |
| | 'provider_overloaded' |
| | 'provider_rejected' |
| | 'provider_failed' |
| | 'timed_out'; |
| |
| export class ClientCapabilityInvocationError extends Error { |
| constructor( |
| readonly code: ClientCapabilityInvocationFailure, |
| message: string, |
| ) { |
| super(message); |
| this.name = 'ClientCapabilityInvocationError'; |
| } |
| } |
| |
| export interface ClientCapabilityInvocationRegistration { |
| readonly connectionId: string; |
| readonly registrationId: string; |
| } |
| |
| export interface ClientCapabilityInvocationBinding { |
| readonly offerId: string; |
| readonly hostPathAccess: ClientCapabilityHostPathAccess; |
| readonly descriptor: ClientCapabilityToolDescriptor; |
| } |
| |
| interface ClientCapabilityInvocationContext { |
| readonly sessionId: string; |
| readonly turnId: string; |
| readonly toolCallId: string; |
| readonly cwd: string; |
| } |
| |
| interface InvocationState<Registration extends ClientCapabilityInvocationRegistration> { |
| readonly invocationId: string; |
| readonly registration: Registration; |
| readonly resolve: (result: ClientCapabilityCallResult) => void; |
| readonly reject: (error: Error) => void; |
| readonly resolveAccepted: (evidence: ClientCapabilityAdmissionEvidence) => void; |
| readonly rejectAccepted: (error: Error) => void; |
| readonly signal?: AbortSignal; |
| readonly onAbort?: () => void; |
| onProgress?: (current: number, total: number) => void; |
| requestInteraction?: ClientCapabilityInteractionHandler; |
| readonly timeoutMs: number; |
| readonly providerAvailability: AbortController; |
| cancelTimer?: () => void; |
| interaction?: InvocationInteraction; |
| acceptedSettled: boolean; |
| phase: |
| | 'dispatched' |
| | 'accepted' |
| | 'admitted' |
| | 'awaiting_interaction' |
| | 'delivering_interaction_result' |
| | 'chunks'; |
| progress?: { current: number; total: number }; |
| chunks?: { |
| readonly byteLength: number; |
| readonly chunkCount: number; |
| readonly values: Buffer[]; |
| receivedBytes: number; |
| }; |
| } |
| |
| interface InvocationInteraction { |
| readonly interactionId: string; |
| readonly controller: AbortController; |
| readonly done: Promise<void>; |
| readonly resolveDone: () => void; |
| terminal?: { readonly error: Error; readonly releaseRemote: boolean }; |
| } |
| |
| type ClientCapabilityInteractionHandler = ( |
| form: InteractionFormInput, |
| options?: { readonly cancellationSignal?: AbortSignal }, |
| ) => Promise<InteractionFormResult>; |
| |
| export interface PreparedClientCapabilityInvocation { |
| readonly invocationId: string; |
| /** Resolves once the provider has parsed the call and is waiting at its admission cut. */ |
| waitUntilAccepted(): Promise<ClientCapabilityAdmissionEvidence>; |
| /** Crosses the admission cut and returns the provider result. */ |
| admit( |
| onProgress?: (current: number, total: number) => void, |
| requestInteraction?: ClientCapabilityInteractionHandler, |
| ): Promise<ClientCapabilityCallResult>; |
| /** Cancels an accepted call that will not cross the admission cut. */ |
| cancel(): void; |
| /** Aborts when the provider connection disappears before this call is admitted. */ |
| readonly providerSignal: AbortSignal; |
| } |
| |
| export interface ClientCapabilityInvocationBrokerOptions< |
| Registration extends ClientCapabilityInvocationRegistration, |
| > { |
| readonly senderFor: (connectionId: string) => ClientCapabilityConnectionSender | undefined; |
| readonly onRegistrationIdle: (registration: Registration) => void; |
| readonly scheduleTimeout?: (callback: () => void, timeoutMs: number) => () => void; |
| } |
| |
| export class ClientCapabilityInvocationBroker< |
| Registration extends ClientCapabilityInvocationRegistration, |
| > { |
| readonly #senderFor: ClientCapabilityInvocationBrokerOptions<Registration>['senderFor']; |
| readonly #onRegistrationIdle: ClientCapabilityInvocationBrokerOptions<Registration>['onRegistrationIdle']; |
| readonly #scheduleTimeout: NonNullable< |
| ClientCapabilityInvocationBrokerOptions<Registration>['scheduleTimeout'] |
| >; |
| readonly #invocations = new Map<string, InvocationState<Registration>>(); |
| readonly #retiredInvocationIds = new Set<string>(); |
| |
| constructor(options: ClientCapabilityInvocationBrokerOptions<Registration>) { |
| this.#senderFor = options.senderFor; |
| this.#onRegistrationIdle = options.onRegistrationIdle; |
| this.#scheduleTimeout = |
| options.scheduleTimeout ?? |
| ((callback, timeoutMs) => { |
| const timer = setTimeout(callback, timeoutMs); |
| return () => clearTimeout(timer); |
| }); |
| } |
| |
| async invoke( |
| registration: Registration, |
| binding: ClientCapabilityInvocationBinding, |
| args: Record<string, unknown>, |
| context: ClientCapabilityInvocationContext, |
| signal: AbortSignal | undefined, |
| timeoutMs: number, |
| onProgress?: (current: number, total: number) => void, |
| requestInteraction?: ClientCapabilityInteractionHandler, |
| ): Promise<ClientCapabilityCallResult> { |
| const prepared = this.prepare( |
| registration, |
| binding, |
| args, |
| context, |
| signal, |
| timeoutMs, |
| onProgress, |
| requestInteraction, |
| ); |
| await prepared.waitUntilAccepted(); |
| return prepared.admit(); |
| } |
| |
| prepare( |
| registration: Registration, |
| binding: ClientCapabilityInvocationBinding, |
| args: Record<string, unknown>, |
| context: ClientCapabilityInvocationContext, |
| signal: AbortSignal | undefined, |
| timeoutMs: number, |
| onProgress?: (current: number, total: number) => void, |
| requestInteraction?: ClientCapabilityInteractionHandler, |
| ): PreparedClientCapabilityInvocation { |
| return this.#prepare( |
| registration, |
| signal, |
| timeoutMs, |
| onProgress, |
| requestInteraction, |
| (invocationId) => ({ |
| kind: 'client.capability.call', |
| invocationId, |
| registrationId: registration.registrationId, |
| offerId: binding.offerId, |
| serverId: binding.descriptor.serverId, |
| toolName: binding.descriptor.name, |
| arguments: args, |
| sessionId: context.sessionId, |
| turnId: context.turnId, |
| toolCallId: context.toolCallId, |
| ...(binding.hostPathAccess === 'cwd' ? { cwd: context.cwd } : {}), |
| }), |
| ); |
| } |
| |
| async invokeService( |
| registration: Registration, |
| serviceId: string, |
| version: string, |
| method: string, |
| input: Record<string, unknown>, |
| signal: AbortSignal | undefined, |
| timeoutMs: number, |
| ): Promise<ClientCapabilityCallResult> { |
| const prepared = this.prepareService( |
| registration, |
| serviceId, |
| version, |
| method, |
| input, |
| signal, |
| timeoutMs, |
| ); |
| await prepared.waitUntilAccepted(); |
| return prepared.admit(); |
| } |
| |
| prepareService( |
| registration: Registration, |
| serviceId: string, |
| version: string, |
| method: string, |
| input: Record<string, unknown>, |
| signal: AbortSignal | undefined, |
| timeoutMs: number, |
| ): PreparedClientCapabilityInvocation { |
| return this.#prepare(registration, signal, timeoutMs, undefined, undefined, (invocationId) => ({ |
| kind: 'client.capability.service_call', |
| invocationId, |
| registrationId: registration.registrationId, |
| serviceId, |
| version, |
| method, |
| input, |
| })); |
| } |
| |
| #prepare( |
| registration: Registration, |
| signal: AbortSignal | undefined, |
| timeoutMs: number, |
| onProgress: ((current: number, total: number) => void) | undefined, |
| requestInteraction: ClientCapabilityInteractionHandler | undefined, |
| frameFor: (invocationId: string) => ClientCapabilityHostFrame, |
| ): PreparedClientCapabilityInvocation { |
| const sender = this.#senderFor(registration.connectionId); |
| if (!sender) { |
| throw new ClientCapabilityInvocationError( |
| 'capability_lost', |
| 'Client Capability provider is unavailable', |
| ); |
| } |
| if (signal?.aborted) throw abortReason(signal); |
| const activeForConnection = [...this.#invocations.values()].filter( |
| (invocation) => invocation.registration.connectionId === registration.connectionId, |
| ).length; |
| if (activeForConnection >= MAX_CONCURRENT_INVOCATIONS_PER_CONNECTION) { |
| throw new ClientCapabilityInvocationError( |
| 'provider_overloaded', |
| 'Client Capability provider has too many active invocations', |
| ); |
| } |
| |
| const invocationId = randomUUID(); |
| let resolveAccepted!: (evidence: ClientCapabilityAdmissionEvidence) => void; |
| let rejectAccepted!: (error: Error) => void; |
| const accepted = new Promise<ClientCapabilityAdmissionEvidence>((resolve, reject) => { |
| resolveAccepted = resolve; |
| rejectAccepted = reject; |
| }); |
| const result = new Promise<ClientCapabilityCallResult>((resolve, reject) => { |
| const onAbort = signal |
| ? () => { |
| const invocation = this.#invocations.get(invocationId); |
| if (!invocation) return; |
| void sender.send({ kind: 'client.capability.cancel', invocationId }).catch(() => {}); |
| const error = |
| invocation.phase === 'dispatched' || invocation.phase === 'accepted' |
| ? asError(abortReason(signal)) |
| : new ToolOutcomeUnknownError( |
| 'Client Capability invocation was cancelled after admission', |
| ); |
| if (invocation.interaction) { |
| this.#terminateInteraction(invocation, error, true, true); |
| } else { |
| this.#settle(invocation, undefined, error, true); |
| } |
| } |
| : undefined; |
| const invocation: InvocationState<Registration> = { |
| invocationId, |
| registration, |
| resolve, |
| reject, |
| resolveAccepted, |
| rejectAccepted, |
| signal, |
| onAbort, |
| onProgress, |
| requestInteraction, |
| timeoutMs, |
| providerAvailability: new AbortController(), |
| acceptedSettled: false, |
| phase: 'dispatched', |
| }; |
| this.#invocations.set(invocationId, invocation); |
| this.#armTimer(invocation); |
| if (onAbort) signal?.addEventListener('abort', onAbort, { once: true }); |
| void sender.send(frameFor(invocationId)).catch(() => { |
| const current = this.#invocations.get(invocationId); |
| if (!current) return; |
| this.#settle( |
| current, |
| undefined, |
| new ClientCapabilityInvocationError( |
| 'capability_lost', |
| 'Client Capability call could not be delivered', |
| ), |
| false, |
| ); |
| }); |
| }); |
| // A caller waiting only for provider acceptance still receives the same |
| // failure through `accepted`; keep the result rejection from becoming |
| // an unrelated unhandled rejection. |
| void result.catch(() => {}); |
| return { |
| invocationId, |
| providerSignal: |
| this.#invocations.get(invocationId)?.providerAvailability.signal ?? AbortSignal.abort(), |
| waitUntilAccepted: () => accepted, |
| admit: async (onProgress, requestInteraction) => { |
| await accepted; |
| const invocation = this.#invocations.get(invocationId); |
| if (!invocation) return result; |
| if (invocation.phase === 'accepted') { |
| invocation.onProgress = onProgress ?? invocation.onProgress; |
| invocation.requestInteraction = requestInteraction ?? invocation.requestInteraction; |
| invocation.phase = 'admitted'; |
| this.#armTimer(invocation); |
| const currentSender = this.#senderFor(invocation.registration.connectionId); |
| if (!currentSender) { |
| this.#settle( |
| invocation, |
| undefined, |
| new ClientCapabilityInvocationError( |
| 'capability_lost', |
| 'Client Capability provider disappeared before admission', |
| ), |
| false, |
| ); |
| } else { |
| void currentSender |
| .send({ kind: 'client.capability.admitted', invocationId }) |
| .catch(() => { |
| const current = this.#invocations.get(invocationId); |
| if (!current) return; |
| this.#settle( |
| current, |
| undefined, |
| new ToolOutcomeUnknownError( |
| 'Client Capability admission acknowledgement could not be delivered', |
| ), |
| false, |
| ); |
| }); |
| } |
| } |
| return result; |
| }, |
| cancel: () => { |
| const invocation = this.#invocations.get(invocationId); |
| if (!invocation) return; |
| const currentSender = this.#senderFor(invocation.registration.connectionId); |
| void currentSender |
| ?.send({ kind: 'client.capability.cancel', invocationId }) |
| .catch(() => {}); |
| this.#settle( |
| invocation, |
| undefined, |
| new ClientCapabilityInvocationError( |
| 'provider_rejected', |
| 'Client Capability invocation was cancelled before admission', |
| ), |
| true, |
| ); |
| }, |
| }; |
| } |
| |
| accept(connectionId: string, frame: ClientCapabilityClientFrame): void { |
| const invocation = this.#invocations.get(frame.invocationId); |
| if (!invocation) { |
| if (this.#retiredInvocationIds.has(frame.invocationId)) return; |
| throw new Error('Client Capability provider returned an unmatched invocation frame'); |
| } |
| if (invocation.registration.connectionId !== connectionId) { |
| throw new Error('Client Capability provider returned another connection invocation'); |
| } |
| switch (frame.kind) { |
| case 'client.capability.accepted': { |
| if (invocation.phase !== 'dispatched') { |
| throw new Error('Client Capability invocation was accepted more than once'); |
| } |
| invocation.phase = 'accepted'; |
| this.#clearTimer(invocation); |
| invocation.acceptedSettled = true; |
| invocation.resolveAccepted(frame.admissionEvidence); |
| return; |
| } |
| case 'client.capability.rejected': |
| if (invocation.phase !== 'dispatched') { |
| throw new Error('Accepted Client Capability invocation cannot be rejected'); |
| } |
| this.#settle( |
| invocation, |
| undefined, |
| new ClientCapabilityInvocationError('provider_rejected', frame.message), |
| true, |
| ); |
| return; |
| case 'client.capability.failed': |
| if (invocation.phase === 'dispatched' || invocation.phase === 'accepted') { |
| throw new Error('Client Capability failure arrived before admission'); |
| } |
| if (invocation.interaction) { |
| this.#terminateInteraction( |
| invocation, |
| new ClientCapabilityInvocationError('provider_failed', frame.message), |
| true, |
| true, |
| ); |
| } else { |
| this.#settle( |
| invocation, |
| undefined, |
| new ClientCapabilityInvocationError('provider_failed', frame.message), |
| true, |
| ); |
| } |
| return; |
| case 'client.capability.progress': |
| if ( |
| invocation.phase !== 'admitted' && |
| invocation.phase !== 'delivering_interaction_result' && |
| invocation.phase !== 'chunks' |
| ) { |
| throw new Error('Client Capability progress arrived before admission'); |
| } |
| if ( |
| invocation.progress && |
| (frame.total !== invocation.progress.total || frame.current < invocation.progress.current) |
| ) { |
| throw new Error('Client Capability progress moved backwards or changed total'); |
| } |
| if (frame.current === invocation.progress?.current) return; |
| invocation.progress = { current: frame.current, total: frame.total }; |
| invocation.onProgress?.(frame.current, frame.total); |
| return; |
| case 'client.capability.interaction_request': |
| this.#acceptInteraction(invocation, frame.interactionId, frame.request); |
| return; |
| case 'client.capability.result': |
| if (invocation.phase === 'awaiting_interaction') { |
| this.#terminateInteraction( |
| invocation, |
| new ClientCapabilityInvocationError( |
| 'provider_failed', |
| 'Client Capability provider returned before its interaction completed', |
| ), |
| true, |
| true, |
| ); |
| return; |
| } |
| if ( |
| invocation.phase !== 'admitted' && |
| invocation.phase !== 'delivering_interaction_result' |
| ) { |
| throw new Error('Client Capability result arrived outside the admitted phase'); |
| } |
| this.#settle(invocation, frame.result, undefined, true); |
| return; |
| case 'client.capability.result_start': |
| if (invocation.phase === 'awaiting_interaction') { |
| this.#terminateInteraction( |
| invocation, |
| new ClientCapabilityInvocationError( |
| 'provider_failed', |
| 'Client Capability provider returned before its interaction completed', |
| ), |
| true, |
| true, |
| ); |
| return; |
| } |
| if ( |
| invocation.phase !== 'admitted' && |
| invocation.phase !== 'delivering_interaction_result' |
| ) { |
| throw new Error('Client Capability result chunks started outside the admitted phase'); |
| } |
| invocation.phase = 'chunks'; |
| invocation.chunks = { |
| byteLength: frame.byteLength, |
| chunkCount: frame.chunkCount, |
| values: [], |
| receivedBytes: 0, |
| }; |
| return; |
| case 'client.capability.result_chunk': |
| this.#acceptChunk(invocation, frame.index, frame.data); |
| } |
| } |
| |
| async releaseConnection(connectionId: string): Promise<void> { |
| const interactions: Promise<void>[] = []; |
| for (const invocation of [...this.#invocations.values()]) { |
| if (invocation.registration.connectionId !== connectionId) continue; |
| if (invocation.phase === 'dispatched' || invocation.phase === 'accepted') { |
| invocation.providerAvailability.abort( |
| new ClientCapabilityInvocationError( |
| 'capability_lost', |
| 'Client Capability provider disconnected before admission', |
| ), |
| ); |
| } |
| const error = |
| invocation.phase === 'dispatched' || invocation.phase === 'accepted' |
| ? new ClientCapabilityInvocationError( |
| 'capability_lost', |
| 'Client Capability provider disconnected before admission', |
| ) |
| : new ToolOutcomeUnknownError( |
| 'Client Capability provider disconnected after accepting the call', |
| ); |
| if (invocation.interaction) { |
| interactions.push(invocation.interaction.done); |
| this.#terminateInteraction(invocation, error, false, true); |
| } else { |
| this.#settle(invocation, undefined, error, false); |
| } |
| } |
| await Promise.all(interactions); |
| } |
| |
| holdsRegistration(registration: Registration): boolean { |
| return [...this.#invocations.values()].some( |
| (invocation) => invocation.registration === registration, |
| ); |
| } |
| |
| close(): void { |
| if (this.#invocations.size !== 0) { |
| throw new Error('Client Capability invocation broker closed with active invocations'); |
| } |
| this.#retiredInvocationIds.clear(); |
| } |
| |
| #acceptChunk(invocation: InvocationState<Registration>, index: number, data: string): void { |
| const chunks = invocation.chunks; |
| if (invocation.phase !== 'chunks' || !chunks || index !== chunks.values.length) { |
| throw new Error('Client Capability result chunk is out of sequence'); |
| } |
| const value = Buffer.from(data, 'base64'); |
| const remaining = chunks.byteLength - chunks.receivedBytes; |
| const expectedLength = Math.min(CLIENT_CAPABILITY_RESULT_CHUNK_MAX_BYTES, remaining); |
| if (value.byteLength !== expectedLength || index >= chunks.chunkCount) { |
| throw new Error('Client Capability result chunk has invalid bounds'); |
| } |
| chunks.values.push(value); |
| chunks.receivedBytes += value.byteLength; |
| if (chunks.values.length !== chunks.chunkCount) return; |
| if ( |
| chunks.receivedBytes !== chunks.byteLength || |
| chunks.receivedBytes > CLIENT_CAPABILITY_MAX_RESULT_BYTES |
| ) { |
| throw new Error('Client Capability chunked result length changed'); |
| } |
| let decoded: unknown; |
| try { |
| decoded = JSON.parse(Buffer.concat(chunks.values).toString('utf8')); |
| } catch { |
| throw new Error('Client Capability chunked result is not valid JSON'); |
| } |
| this.#settle(invocation, decodeClientCapabilityResult(decoded), undefined, true); |
| } |
| |
| #acceptInteraction( |
| invocation: InvocationState<Registration>, |
| interactionId: string, |
| request: InteractionFormInput, |
| ): void { |
| if ( |
| (invocation.phase !== 'admitted' && invocation.phase !== 'delivering_interaction_result') || |
| invocation.interaction |
| ) { |
| if (invocation.interaction) { |
| this.#terminateInteraction( |
| invocation, |
| new ClientCapabilityInvocationError( |
| 'provider_failed', |
| 'Client Capability provider requested overlapping interactions', |
| ), |
| true, |
| true, |
| ); |
| return; |
| } |
| throw new Error('Client Capability interaction arrived outside the admitted phase'); |
| } |
| if (!invocation.requestInteraction) { |
| this.#settle( |
| invocation, |
| undefined, |
| new ClientCapabilityInvocationError( |
| 'provider_failed', |
| 'Client Capability interaction is unavailable for this invocation', |
| ), |
| true, |
| ); |
| return; |
| } |
| this.#clearTimer(invocation); |
| invocation.phase = 'awaiting_interaction'; |
| let resolveDone!: () => void; |
| const interaction: InvocationInteraction = { |
| interactionId, |
| controller: new AbortController(), |
| done: new Promise<void>((resolve) => { |
| resolveDone = resolve; |
| }), |
| resolveDone: () => resolveDone(), |
| }; |
| invocation.interaction = interaction; |
| void this.#runInteraction(invocation, interaction, request); |
| } |
| |
| async #runInteraction( |
| invocation: InvocationState<Registration>, |
| interaction: InvocationInteraction, |
| request: InteractionFormInput, |
| ): Promise<void> { |
| try { |
| const signal = invocation.signal |
| ? AbortSignal.any([invocation.signal, interaction.controller.signal]) |
| : interaction.controller.signal; |
| const result = await invocation.requestInteraction!(request, { |
| cancellationSignal: signal, |
| }); |
| if (!this.#isCurrentInteraction(invocation, interaction)) return; |
| const terminalBeforeSend = interaction.terminal; |
| if (terminalBeforeSend) { |
| this.#settle( |
| invocation, |
| undefined, |
| terminalBeforeSend.error, |
| terminalBeforeSend.releaseRemote, |
| ); |
| return; |
| } |
| const sender = this.#senderFor(invocation.registration.connectionId); |
| if (!sender) { |
| this.#settle( |
| invocation, |
| undefined, |
| new ToolOutcomeUnknownError( |
| 'Client Capability provider disappeared before receiving an interaction result', |
| ), |
| false, |
| ); |
| return; |
| } |
| invocation.interaction = undefined; |
| invocation.phase = 'delivering_interaction_result'; |
| this.#armTimer(invocation); |
| await sender.send({ |
| kind: 'client.capability.interaction_result', |
| invocationId: invocation.invocationId, |
| interactionId: interaction.interactionId, |
| result, |
| }); |
| if (this.#invocations.get(invocation.invocationId) !== invocation) return; |
| if (invocation.phase !== 'delivering_interaction_result') return; |
| invocation.phase = 'admitted'; |
| this.#armTimer(invocation); |
| } catch (error) { |
| if (this.#invocations.get(invocation.invocationId) !== invocation) return; |
| if (invocation.interaction !== interaction) { |
| if (invocation.phase !== 'delivering_interaction_result') return; |
| this.#settle( |
| invocation, |
| undefined, |
| new ToolOutcomeUnknownError( |
| `Client Capability interaction result could not be delivered: ${asError(error).message}`, |
| ), |
| false, |
| ); |
| return; |
| } |
| this.#settle( |
| invocation, |
| undefined, |
| interaction.terminal?.error ?? asError(error), |
| interaction.terminal?.releaseRemote ?? true, |
| ); |
| } finally { |
| interaction.resolveDone(); |
| } |
| } |
| |
| #terminateInteraction( |
| invocation: InvocationState<Registration>, |
| error: Error, |
| releaseRemote: boolean, |
| cancelProducer: boolean, |
| ): void { |
| const interaction = invocation.interaction; |
| if (!interaction || interaction.terminal) return; |
| interaction.terminal = { error, releaseRemote }; |
| if (cancelProducer) interaction.controller.abort(error); |
| } |
| |
| #isCurrentInteraction( |
| invocation: InvocationState<Registration>, |
| interaction: InvocationInteraction, |
| ): boolean { |
| return ( |
| this.#invocations.get(invocation.invocationId) === invocation && |
| invocation.interaction === interaction |
| ); |
| } |
| |
| #armTimer(invocation: InvocationState<Registration>): void { |
| this.#clearTimer(invocation); |
| invocation.cancelTimer = this.#scheduleTimeout(() => { |
| const current = this.#invocations.get(invocation.invocationId); |
| if (current !== invocation) return; |
| const sender = this.#senderFor(current.registration.connectionId); |
| void sender |
| ?.send({ kind: 'client.capability.cancel', invocationId: current.invocationId }) |
| .catch(() => {}); |
| this.#settle( |
| current, |
| undefined, |
| current.phase === 'dispatched' || current.phase === 'accepted' |
| ? new ClientCapabilityInvocationError( |
| 'timed_out', |
| 'Client Capability invocation timed out before admission', |
| ) |
| : new ToolOutcomeUnknownError('Client Capability invocation timed out after admission'), |
| true, |
| ); |
| }, invocation.timeoutMs); |
| } |
| |
| #clearTimer(invocation: InvocationState<Registration>): void { |
| invocation.cancelTimer?.(); |
| invocation.cancelTimer = undefined; |
| } |
| |
| #settle( |
| invocation: InvocationState<Registration>, |
| result: ClientCapabilityCallResult | undefined, |
| error: Error | undefined, |
| releaseRemote: boolean, |
| ): void { |
| if (this.#invocations.get(invocation.invocationId) !== invocation) return; |
| this.#invocations.delete(invocation.invocationId); |
| this.#clearTimer(invocation); |
| if (invocation.onAbort && invocation.signal) { |
| invocation.signal.removeEventListener('abort', invocation.onAbort); |
| } |
| this.#rememberRetired(invocation.invocationId); |
| if (releaseRemote) { |
| const sender = this.#senderFor(invocation.registration.connectionId); |
| void sender |
| ?.send({ |
| kind: 'client.capability.release', |
| invocationId: invocation.invocationId, |
| }) |
| .catch(() => {}); |
| } |
| if (!invocation.acceptedSettled) { |
| invocation.acceptedSettled = true; |
| if (error) invocation.rejectAccepted(error); |
| else |
| invocation.rejectAccepted( |
| new Error('Client Capability invocation settled before provider acceptance'), |
| ); |
| } |
| if (error) invocation.reject(error); |
| else if (result) invocation.resolve(result); |
| else invocation.reject(new Error('Client Capability invocation settled without an outcome')); |
| this.#onRegistrationIdle(invocation.registration); |
| } |
| |
| #rememberRetired(invocationId: string): void { |
| this.#retiredInvocationIds.add(invocationId); |
| if (this.#retiredInvocationIds.size <= MAX_RETIRED_INVOCATIONS) return; |
| const oldest = this.#retiredInvocationIds.values().next().value; |
| if (typeof oldest === 'string') this.#retiredInvocationIds.delete(oldest); |
| } |
| } |
| |
| function abortReason(signal: AbortSignal): unknown { |
| return signal.reason ?? new Error('Client Capability invocation cancelled'); |
| } |
| |
| function asError(error: unknown): Error { |
| return error instanceof Error ? error : new Error(String(error)); |
| } |
