591 lines
25 KiB
TypeScript
591 lines
25 KiB
TypeScript
/**
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* Host-side ApiProxy implementation. Signature discipline: unary takes the
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* narrow RpcRequest<P> and echoes request.rpcId on the RpcResponse<T>.
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*/
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import { randomUUID } from 'node:crypto'
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import { stat } from 'node:fs/promises'
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import type { Context } from 'cordis'
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import type { Agent, AgentStatus } from '@deepseek-ai/dsh-agent'
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import type { ContentBlock, MessageSource } from '@deepseek-ai/dsh-llm'
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import type { JsonValue, Session, SessionEvent, SessionHeader, SessionId } from '@deepseek-ai/dsh-session'
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import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
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import { foldSessionTitle } from '@deepseek-ai/dsh-session-title'
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import type {
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ApiProxy, HistoryEntry, HostFrame, MuxFrame, QuestionResponsePayload, SessionSummary, ToolEventView,
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} from '@deepseek-ai/dsh-host-apiproxy/api'
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import { questionResponsePayloadSchema } from '@deepseek-ai/dsh-host-apiproxy/api/questions.schema'
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import type { ClientResponse, RpcError, RpcReceipt, RpcRequest, RpcResponse } from '@deepseek-ai/dsh-host-apiproxy/api/rpc'
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import { RpcId } from '@deepseek-ai/dsh-host-apiproxy/api/rpc'
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import type {
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AskUserQuestionAnswer, AskUserQuestionItem, AskUserQuestionRequest,
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} from '@deepseek-ai/dsh-user-interaction'
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import { UserInteractionError } from '@deepseek-ai/dsh-user-interaction'
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/** Page size when history is called without maxMessages. */
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const DEFAULT_MAX_MESSAGES = 50
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/** Surface message event types (the pagination counting unit). */
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const MESSAGE_TYPES = new Set(['user/message', 'assistant/message', 'steering/message'])
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/**
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* Message-boundary pagination: count maxMessages surface messages backwards from
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* the window tail; the cut is the starting seq of the oldest message group
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* (chunks group via sourceEventSeqs — never cut mid-message). The tail page
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* naturally includes the in-progress partial.
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*/
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function paginate(
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events: readonly SessionEvent[],
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beforeSeq: number | undefined,
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maxMessages: number,
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): { events: SessionEvent[]; hasMore: boolean } {
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const window = beforeSeq === undefined ? [...events] : events.filter(event => event.seq < beforeSeq)
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let count = 0
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let cut = 0
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for (let i = window.length - 1; i >= 0; i--) {
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const event = window[i] as SessionEvent
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if (!MESSAGE_TYPES.has(event.type)) continue
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count++
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const sources = (event as { sourceEventSeqs?: number[] }).sourceEventSeqs
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const groupStart = sources !== undefined && sources.length > 0 ? Math.min(event.seq, ...sources) : event.seq
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if (count >= maxMessages) {
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cut = groupStart
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break
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}
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}
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const page = window.filter(event => event.seq >= cut)
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return { events: page, hasMore: cut > 0 }
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}
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/** Wrap an ok result echoing the request's rpcId. */
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function ok<T>(request: RpcRequest<unknown>, value: T): RpcResponse<T> {
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return { rpcId: request.rpcId, result: { ok: true, value } }
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}
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/** Wrap an error result echoing the request's rpcId. */
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function err<T>(request: RpcRequest<unknown>, error: RpcError): RpcResponse<T> {
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return { rpcId: request.rpcId, result: { ok: false, error } }
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}
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/** Simple async queue: core callbacks push, the AsyncIterable pulls; abort/return cleans up. */
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class FrameQueue<F> {
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private buffer: F[] = []
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private waiter: (() => void) | undefined
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private done = false
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push(item: F): void {
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if (this.done) return
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this.buffer.push(item)
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this.waiter?.()
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}
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end(): void {
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this.done = true
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this.waiter?.()
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}
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async *iterate(signal: AbortSignal, cleanup: () => void): AsyncGenerator<F> {
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const onAbort = (): void => { this.end() }
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signal.addEventListener('abort', onAbort, { once: true })
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try {
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while (true) {
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while (this.buffer.length > 0) yield this.buffer.shift() as F
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if (this.done || signal.aborted) return
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await new Promise<void>((resolve) => { this.waiter = resolve })
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this.waiter = undefined
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}
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} finally {
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signal.removeEventListener('abort', onAbort)
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cleanup()
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}
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}
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}
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/**
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* Server-side frame mint: pure pushes get a fresh rpcId per frame (stable ids
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* for answerable frames belong to the approval/question registry, absent in
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* this minimal version).
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*/
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function frame<F>(payload: F): RpcRequest<F> {
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return { rpcId: RpcId(randomUUID()), payload }
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}
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type SessionTitleFrame = Extract<MuxFrame, { type: 'session/title' }>
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/** Project the latest durable title without exposing title-generation policy. */
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function titleFrame(session: Session): SessionTitleFrame | undefined {
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const title = foldSessionTitle(session.events)
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if (title === undefined) return undefined
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return {
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type: 'session/title',
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sessionId: session.id,
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title: title.title,
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eventSeq: title.eventSeq,
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updatedAt: title.updatedAt,
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}
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}
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/** Queue the subscription baseline followed by its optional title snapshot. */
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function subscribeSession(queue: FrameQueue<RpcRequest<MuxFrame>>, session: Session): void {
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queue.push(frame({ type: 'session/subscribed', sessionId: session.id, lastSeq: session.seq - 1 }))
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const title = titleFrame(session)
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if (title !== undefined) queue.push(frame(title))
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}
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/** SessionSummary projection for attached (in-memory) sessions. */
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function summarize(session: Session, running: boolean): SessionSummary {
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return {
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sessionId: session.id,
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updatedAt: session.events.at(-1)?.time ?? session.header.createdAt,
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running,
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...session.header.parentSession === undefined ? {} : { parentSessionId: session.header.parentSession },
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...session.header.cwd === undefined ? {} : { cwd: session.header.cwd },
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}
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}
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/**
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* SessionSummary projection for cold (persisted, unattached) sessions.
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* updatedAt is the log file's mtime; backends without a per-session file
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* (locate() undefined) fall back to the header's createdAt.
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*/
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async function summarizeCold(persistence: SessionPersistence, meta: SessionHeader): Promise<SessionSummary> {
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let updatedAt = meta.createdAt
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const location = persistence.locate(meta)
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if (location !== undefined) {
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try {
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updatedAt = (await stat(location.path)).mtimeMs
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} catch {
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// The log vanished between list() and stat() (concurrent cleanup); createdAt stands in.
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}
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}
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return {
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sessionId: meta.id,
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updatedAt,
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running: false,
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...meta.parentSession === undefined ? {} : { parentSessionId: meta.parentSession },
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/* v8 ignore next -- the empty arm needs a cwd-less meta, but list()
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filters those out (legacy logs are not served); the conditional mirrors
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summarize() shape. */
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...meta.cwd === undefined ? {} : { cwd: meta.cwd },
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}
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}
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/** Host-level default agent routing (same shape as bootHost's HostDefaults; avoids an impl→index reverse import). */
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export interface ApiProxyDefaults {
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provider: string
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model: string
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/** Default project directory for new sessions whose create request carries no cwd. */
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cwd: string
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}
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/** The tool/call payload fields the presenter path reads. */
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interface ToolCallData { callId: string; name: string; arguments: string }
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/** The tool/result payload fields the presenter path reads. */
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interface ToolResultData { callId: string; content: ContentBlock[]; isError: boolean; meta?: JsonValue }
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/** One host-owned question wait, addressed by the stable server-request id. */
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interface PendingQuestion {
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rpcId: RpcId
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sessionId: SessionId
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questions: AskUserQuestionItem[]
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resolve: (answer: AskUserQuestionAnswer) => void
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reject: (error: UserInteractionError) => void
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signal?: AbortSignal
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onAbort?: () => void
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}
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/** Validate one answer batch against the exact question request it resolves. */
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function matchesQuestions(payload: QuestionResponsePayload, pending: PendingQuestion): boolean {
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if (payload.sessionId !== pending.sessionId) return false
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const answers = payload.answer.answers
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if (answers.length !== pending.questions.length) return false
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return answers.every((answer, index) => {
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const question = pending.questions[index] as AskUserQuestionItem
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if (answer.id !== question.id) return false
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if (new Set(answer.selected).size !== answer.selected.length) return false
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const custom = answer.custom?.trim()
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if (custom !== undefined && custom === '') return false
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if (custom !== undefined && answer.selected.length > 0) return false
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if (question.multiSelect !== true && answer.selected.length > 1) return false
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const labels = new Set(question.options?.map(option => option.label) ?? [])
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return answer.selected.every(label => labels.has(label))
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})
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}
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/**
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* Compute the render intent for a tool/call or tool/result event through the
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* presenters registered at this moment; every other event type gets none. A
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* result's presenter needs its call's parsed args — `argsFor` supplies them
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* (live: the per-session call table; history: an in-page backscan), returning
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* undefined when the pairing is unavailable (e.g. the call fell off the page),
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* which soft-falls to no view. Presenter or JSON.parse throws also soft-fall:
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* the client's documented default (generic JSON card) covers every miss.
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*/
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function viewFor(ctx: Context, event: SessionEvent, argsFor: (callId: string) => unknown): ToolEventView | undefined {
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try {
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if (event.type === 'tool/call') {
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const { name, arguments: raw } = event.data as ToolCallData
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const view = ctx.tools.get(name)?.presentCall?.(JSON.parse(raw))
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return view === undefined ? undefined : { for: 'call', view }
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}
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if (event.type === 'tool/result') {
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const { callId, content, isError, meta } = event.data as ToolResultData
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const call = argsFor(callId) as { name: string; args: unknown } | undefined
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if (call === undefined) return undefined
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const view = ctx.tools.get(call.name)?.presentResult?.(call.args, { content, isError, ...meta === undefined ? {} : { meta } })
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return view === undefined ? undefined : { for: 'result', view }
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}
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} catch (error: unknown) {
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// A throwing presenter (or unparseable arguments) must not break delivery;
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// the event still ships, just without a view.
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console.error(`api-proxy: presenter failed for ${event.type}, falling back to generic: ${String(error)}`)
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}
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return undefined
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}
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/**
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* Resolve a tool/result's call pairing by scanning a window of events backwards
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* for the matching tool/call. Used by the history path (the page is the
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* window — a cross-page pairing soft-falls to no view) and by live-path table
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* misses after a reconnect-eviction.
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*/
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function backscanArgs(events: readonly SessionEvent[], callId: string): { name: string; args: unknown } | undefined {
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for (let i = events.length - 1; i >= 0; i--) {
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const event = events[i] as SessionEvent
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if (event.type !== 'tool/call') continue
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const data = event.data as ToolCallData
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if (data.callId !== callId) continue
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try {
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return { name: data.name, args: JSON.parse(data.arguments) }
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} catch {
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// Unparseable stored arguments: same soft-fall as a live parse failure.
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return undefined
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}
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}
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return undefined
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}
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/**
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* Thrown by the cold-resume path when the id names no servable session
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* (absent from the store, or a pre-project legacy log without a cwd).
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*/
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class SessionNotFound extends Error {}
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/**
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* Implement ApiProxy over the ctx composed by bootHost.
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* @param ctx - the root context returned by bootHost (sessions/agents services mounted).
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* @param defaults - host-level default provider/model: injected as
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* agentOptions on create/resume, reported by describe from the same source.
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* @returns the ApiProxy implementation.
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*/
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export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiProxy {
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const agentOptions = { provider: defaults.provider, model: defaults.model }
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/** Implicit resume of cold sessions, deduplicating concurrent calls (follows the jsonrpc sessionCreations precedent). */
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const resumes = new Map<SessionId, Promise<Agent>>()
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const pendingQuestions = new Map<RpcId, PendingQuestion>()
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const muxQueues = new Set<FrameQueue<RpcRequest<MuxFrame>>>()
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/** Send one transient frame to every connected mux consumer. */
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function broadcast(payload: MuxFrame): void {
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const envelope = frame(payload)
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for (const queue of muxQueues) queue.push(envelope)
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}
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/** Remove a wait before settling it: synchronous deletion makes the first claimant win. */
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function claimQuestion(pending: PendingQuestion, outcome: 'answered' | 'cancelled'): void {
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pendingQuestions.delete(pending.rpcId)
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if (pending.signal !== undefined && pending.onAbort !== undefined) {
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pending.signal.removeEventListener('abort', pending.onAbort)
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}
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broadcast({
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type: 'question/resolved', sessionId: pending.sessionId,
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questionRpcId: pending.rpcId, outcome,
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})
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}
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const disposeProvider = ctx.userInteraction.registerProvider({
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ask(request: AskUserQuestionRequest): Promise<AskUserQuestionAnswer> {
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const sessionId = request.agent?.id
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if (sessionId === undefined) {
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return Promise.reject(new UserInteractionError(
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'web user interaction requires an agent-owned session', 'ASK_MISSING_AGENT'))
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}
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return new Promise<AskUserQuestionAnswer>((resolve, reject) => {
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const rpcId = RpcId(randomUUID())
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const pending: PendingQuestion = {
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rpcId, sessionId, questions: request.questions, resolve, reject,
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...(request.signal === undefined ? {} : { signal: request.signal }),
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}
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const onAbort = (): void => {
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claimQuestion(pending, 'cancelled')
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reject(new UserInteractionError(
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'ask_user_question was aborted before the user answered', 'ASK_ABORTED'))
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}
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pending.onAbort = onAbort
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pendingQuestions.set(rpcId, pending)
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request.signal?.addEventListener('abort', onAbort, { once: true })
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const envelope: RpcRequest<MuxFrame> = {
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rpcId,
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payload: { type: 'question/requested', sessionId, questions: request.questions },
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}
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for (const queue of muxQueues) queue.push(envelope)
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})
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},
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})
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ctx.effect(() => () => {
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disposeProvider()
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for (const pending of [...pendingQuestions.values()]) {
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claimQuestion(pending, 'cancelled')
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pending.reject(new UserInteractionError(
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'web user-interaction provider was disposed', 'ASK_ABORTED'))
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}
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}, 'api-proxy: user-interaction provider')
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/**
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* Gate the cold path on the store: an id absent from it, or naming a legacy
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* log without a cwd (pre-release stance: not served, no compatibility), is
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* not-found before any resume is attempted. With the gate passed, a later
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* resume failure is genuinely internal. No persistence configured skips the
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* gate — resume itself then fails loud with its own diagnostic.
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*/
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async function assertServable(sessionId: SessionId): Promise<void> {
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const persistence = ctx.get('sessionPersistence')
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if (persistence === undefined) return
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const meta = (await persistence.list()).find(m => m.id === sessionId)
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if (meta === undefined || meta.cwd === undefined) throw new SessionNotFound(`session "${sessionId}" not found`)
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}
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async function agentFor(sessionId: SessionId): Promise<{ agent: Agent } | { error: RpcError }> {
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const live = ctx.agents.get(sessionId)
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if (live !== undefined) return { agent: live }
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let resume = resumes.get(sessionId)
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if (resume === undefined) {
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resume = (async () => {
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try {
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await assertServable(sessionId)
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const handle = await ctx.agents.resume({ resumeSessionId: sessionId, agentOptions })
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return handle.agent
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} finally {
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resumes.delete(sessionId)
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}
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})()
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resumes.set(sessionId, resume)
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}
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try {
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return { agent: await resume }
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} catch (error: unknown) {
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if (error instanceof SessionNotFound) {
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return { error: { code: 'session-not-found', message: error.message, details: { sessionId } } }
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}
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// The internal details slot is contractually {}; the reason rides the message.
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return { error: { code: 'internal', message: `resume failed for session "${sessionId}": ${String(error)}`, details: {} } }
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}
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}
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return {
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sessions: {
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// Attached sessions summarize from memory; persisted-but-unattached (cold)
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// sessions merge in from the persistence store so history survives restarts.
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// Legacy logs without a cwd (pre-project stance) are not served — every
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// session now records its project at create time.
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async list(request) {
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const items = ctx.sessions.list().map((session) => {
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const agent = ctx.agents.get(session.id)
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return summarize(session, agent?.status === 'running')
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})
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const attached = new Set(items.map(item => item.sessionId))
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const persistence = ctx.get('sessionPersistence')
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if (persistence !== undefined) {
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const cold = (await persistence.list()).filter(meta => !attached.has(meta.id) && meta.cwd !== undefined)
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items.push(...await Promise.all(cold.map(meta => summarizeCold(persistence, meta))))
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}
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items.sort((a, b) => b.updatedAt - a.updatedAt)
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return ok(request, { items })
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},
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async create(request) {
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const sessionId = `session-${randomUUID()}` as SessionId
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// A session's cwd is its project path. When the creator does not choose
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// one, the default project is the host-level default (the host process
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// working directory unless boot overrides it).
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const cwd = request.payload.cwd ?? defaults.cwd
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const handle = await ctx.agents.create({ sessionId, agentOptions, meta: { cwd } })
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return ok(request, { sessionId: handle.agent.id })
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},
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async history(request) {
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const { sessionId, beforeSeq, maxMessages } = request.payload
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const found = await agentFor(sessionId)
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if ('error' in found) return err(request, found.error)
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const page = paginate(found.agent.session.events, beforeSeq, maxMessages ?? DEFAULT_MAX_MESSAGES)
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// Views are computed against the registry at pagination time; result
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// pairing scans within the page only (message-boundary pagination keeps
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// a call and its result on one page — a cross-page miss soft-falls).
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const entries: HistoryEntry[] = page.events.map((event) => {
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const view = viewFor(ctx, event, callId => backscanArgs(page.events, callId))
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return { event, ...view === undefined ? {} : { view } }
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})
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return ok(request, { events: entries, hasMore: page.hasMore })
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},
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async prompt(request) {
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const { sessionId, mode, content } = request.payload
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const found = await agentFor(sessionId)
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if ('error' in found) return err(request, found.error)
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const agent = found.agent
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// The rpcId rides MessageSource into user/message (merge declaration in api/sessions.ts; provisional correlation).
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const source: MessageSource = { kind: 'user', rpcId: request.rpcId }
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try {
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if (mode === 'steer') agent.steer(content, { source })
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else agent.followup(content, { source })
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} catch (error: unknown) {
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// A synchronous throw from send/steer means disposed or invalid input; surface as agent-busy with the reason attached.
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return err(request, { code: 'agent-busy', message: 'prompt rejected', details: { reason: String(error) } })
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}
|
|
return ok(request, { accepted: true as const })
|
|
},
|
|
|
|
cancel(request) {
|
|
const { sessionId } = request.payload
|
|
const agent = ctx.agents.get(sessionId)
|
|
if (agent === undefined) {
|
|
return Promise.resolve(err(request, {
|
|
code: 'session-not-found',
|
|
message: `session "${sessionId}" not found (not attached)`,
|
|
details: { sessionId },
|
|
}))
|
|
}
|
|
agent.cancel()
|
|
return Promise.resolve(ok(request, { accepted: true as const }))
|
|
},
|
|
},
|
|
|
|
host: {
|
|
describe(request) {
|
|
// TODO(step2): version should read apps/cli's package.json; placeholder for now.
|
|
return Promise.resolve(ok(request, {
|
|
version: '0.0.1',
|
|
cwd: process.cwd(),
|
|
provider: defaults.provider,
|
|
model: defaults.model,
|
|
attachedSessions: ctx.agents.list().length,
|
|
}))
|
|
},
|
|
},
|
|
|
|
events: {
|
|
mux(_request, signal) {
|
|
const queue = new FrameQueue<RpcRequest<MuxFrame>>()
|
|
muxQueues.add(queue)
|
|
for (const session of ctx.sessions.list()) {
|
|
subscribeSession(queue, session)
|
|
}
|
|
for (const pending of pendingQuestions.values()) {
|
|
queue.push({
|
|
rpcId: pending.rpcId,
|
|
payload: {
|
|
type: 'question/requested', sessionId: pending.sessionId,
|
|
questions: pending.questions,
|
|
},
|
|
})
|
|
}
|
|
// Per-session open-call table for result-view pairing. Bounded by the
|
|
// per-turn call count: entries clear on turn/end; a table miss (stream
|
|
// opened mid-turn) backscans the session's in-memory events instead.
|
|
const openCalls = new Map<SessionId, Map<string, { name: string; args: unknown }>>()
|
|
const disposers = [
|
|
ctx.on('session/event', (session: Session, event: SessionEvent) => {
|
|
if (event.type === 'tool/call') {
|
|
const data = event.data as ToolCallData
|
|
try {
|
|
let table = openCalls.get(session.id)
|
|
if (table === undefined) openCalls.set(session.id, table = new Map<string, { name: string; args: unknown }>())
|
|
table.set(data.callId, { name: data.name, args: JSON.parse(data.arguments) })
|
|
} catch {
|
|
// Unparseable model arguments: leave the table unset; the result view soft-falls.
|
|
}
|
|
} else if (event.type === 'turn/end') {
|
|
openCalls.delete(session.id)
|
|
}
|
|
const view = viewFor(ctx, event, callId =>
|
|
openCalls.get(session.id)?.get(callId) ?? backscanArgs(session.events, callId))
|
|
queue.push(frame({ type: 'session/event', sessionId: session.id, event, ...view === undefined ? {} : { view } }))
|
|
if (event.type === 'session/title') {
|
|
// The accepted raw event is already in session.events, so the fold must find it.
|
|
queue.push(frame(titleFrame(session) as SessionTitleFrame))
|
|
}
|
|
}),
|
|
ctx.on('session/created', (session: Session) => {
|
|
subscribeSession(queue, session)
|
|
}),
|
|
ctx.on('session/disposed', (session: Session) => {
|
|
openCalls.delete(session.id)
|
|
}),
|
|
]
|
|
return queue.iterate(signal, () => {
|
|
muxQueues.delete(queue)
|
|
for (const dispose of disposers) dispose()
|
|
})
|
|
},
|
|
|
|
host(_request, signal) {
|
|
const queue = new FrameQueue<RpcRequest<HostFrame>>()
|
|
const disposers = [
|
|
ctx.on('session/created', (session: Session) => {
|
|
queue.push(frame({
|
|
type: 'host/session-added',
|
|
sessionId: session.id,
|
|
...session.header.parentSession === undefined ? {} : { parentSessionId: session.header.parentSession },
|
|
}))
|
|
}),
|
|
ctx.on('session/disposed', (session: Session) => {
|
|
queue.push(frame({ type: 'host/session-removed', sessionId: session.id }))
|
|
}),
|
|
ctx.on('agent/status', (agent: Agent, status: AgentStatus) => {
|
|
if (status === 'disposed') return
|
|
queue.push(frame({ type: 'host/session-status', sessionId: agent.id, running: status === 'running' }))
|
|
}),
|
|
ctx.on('agent/error', (agent: Agent, _turn: number, _step: number, error: Error) => {
|
|
queue.push(frame({ type: 'host/agent-error', sessionId: agent.id, message: String(error) }))
|
|
}),
|
|
]
|
|
return queue.iterate(signal, () => { for (const dispose of disposers) dispose() })
|
|
},
|
|
},
|
|
|
|
respond(message: ClientResponse): Promise<RpcReceipt> {
|
|
const pending = pendingQuestions.get(message.rpcId)
|
|
if (pending === undefined) return Promise.resolve({ accepted: false, reason: 'not-pending' })
|
|
if (!message.result.ok) {
|
|
if (message.result.error.code !== 'cancelled') {
|
|
return Promise.resolve({ accepted: false, reason: 'bad-response' })
|
|
}
|
|
claimQuestion(pending, 'cancelled')
|
|
pending.reject(new UserInteractionError(
|
|
'the user cancelled ask_user_question', 'ASK_CANCELLED'))
|
|
return Promise.resolve({ accepted: true })
|
|
}
|
|
const parsed = questionResponsePayloadSchema.safeParse(message.result.value)
|
|
if (!parsed.success) {
|
|
return Promise.resolve({ accepted: false, reason: 'bad-response' })
|
|
}
|
|
const payload: QuestionResponsePayload = {
|
|
sessionId: parsed.data.sessionId,
|
|
answer: {
|
|
answers: parsed.data.answer.answers.map(answer => ({
|
|
id: answer.id,
|
|
selected: answer.selected,
|
|
...(answer.custom === undefined ? {} : { custom: answer.custom }),
|
|
})),
|
|
},
|
|
}
|
|
if (!matchesQuestions(payload, pending)) {
|
|
return Promise.resolve({ accepted: false, reason: 'bad-response' })
|
|
}
|
|
claimQuestion(pending, 'answered')
|
|
pending.resolve(payload.answer)
|
|
return Promise.resolve({ accepted: true })
|
|
},
|
|
}
|
|
}
|