import type { TerminalAttachStreamEvent, TerminalMetadataStreamEvent, TerminalSessionSnapshot, TerminalSummary, EnvironmentId,} from "@t3tools/contracts";import { ThreadId, type TerminalAttachInput } from "@t3tools/contracts";import * as Arr from "effect/Array";import { pipe } from "effect/Function";import * as Order from "effect/Order";import * as Result from "effect/Result";import { Atom, type AtomRegistry } from "effect/unstable/reactivity"; export interface TerminalSessionState { readonly summary: TerminalSummary | null; readonly buffer: string; readonly status: TerminalSessionSnapshot["status"] | "closed"; readonly error: string | null; readonly hasRunningSubprocess: boolean; readonly updatedAt: string | null; readonly version: number;} export interface TerminalBufferState { readonly buffer: string; readonly status: TerminalSessionSnapshot["status"] | "closed"; readonly error: string | null; readonly updatedAt: string | null; readonly version: number;} export interface TerminalSessionTarget { readonly environmentId: EnvironmentId | null; readonly threadId: ThreadId | null; readonly terminalId: string | null;} export interface KnownTerminalSessionTarget { readonly environmentId: EnvironmentId; readonly threadId: ThreadId; readonly terminalId: string;} export interface KnownTerminalSession { readonly target: KnownTerminalSessionTarget; readonly state: TerminalSessionState;} export interface KnownTerminalMetadata { readonly target: KnownTerminalSessionTarget; readonly summary: TerminalSummary;} export interface TerminalSessionListFilter { readonly environmentId: EnvironmentId | null; readonly threadId?: ThreadId | null; readonly terminalId?: string | null;} export interface KnownTerminalSessionListFilter { readonly environmentId: EnvironmentId; readonly threadId: ThreadId | null; readonly terminalId: string | null;} export interface TerminalSessionManagerConfig { readonly getRegistry: () => AtomRegistry.AtomRegistry; readonly maxBufferBytes?: number;} export interface TerminalMetadataClient { readonly terminal: { readonly onMetadata: ( listener: (event: TerminalMetadataStreamEvent) => void, options?: { readonly onResubscribe?: () => void }, ) => () => void; };} export interface TerminalAttachClient { readonly terminal: { readonly attach: ( input: TerminalAttachInput, listener: (event: TerminalAttachStreamEvent) => void, options?: { readonly onResubscribe?: () => void }, ) => () => void; };} export const EMPTY_TERMINAL_BUFFER_STATE = Object.freeze<TerminalBufferState>({ buffer: "", status: "closed", error: null, updatedAt: null, version: 0,}); export const EMPTY_TERMINAL_SESSION_STATE = Object.freeze<TerminalSessionState>({ summary: null, buffer: "", status: "closed", error: null, hasRunningSubprocess: false, updatedAt: null, version: 0,}); const EMPTY_KNOWN_TERMINAL_SESSIONS = Object.freeze<Array<KnownTerminalSession>>([]);const EMPTY_TERMINAL_ID_LIST = Object.freeze<Array<string>>([]);const DEFAULT_MAX_BUFFER_BYTES = 512 * 1024;const knownTerminalMetadataEnvironmentIds = new Set<EnvironmentId>();const knownTerminalBufferTargets = new Map<string, KnownTerminalSessionTarget>();const textEncoder = new TextEncoder();const textDecoder = new TextDecoder();const terminalIdOrder = Order.make<string>( (left, right) => left.localeCompare(right, undefined, { numeric: true }) as -1 | 0 | 1,);const knownTerminalSessionOrder = Order.mapInput( terminalIdOrder, (session: KnownTerminalSession) => session.target.terminalId,); export const terminalSessionMetadataAtom = Atom.family((environmentId: EnvironmentId) => { knownTerminalMetadataEnvironmentIds.add(environmentId); return Atom.make<Record<string, KnownTerminalMetadata>>({}).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:metadata:${environmentId}`), );}); export const terminalSessionBufferAtom = Atom.family((target: KnownTerminalSessionTarget) => { const key = keyFromKnownTarget(target); knownTerminalBufferTargets.set(key, target); return Atom.make(EMPTY_TERMINAL_BUFFER_STATE).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:buffer:${key}`), );}); export const EMPTY_TERMINAL_BUFFER_ATOM = Atom.make(EMPTY_TERMINAL_BUFFER_STATE).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:buffer:null"),); export const EMPTY_TERMINAL_SESSION_ATOM = Atom.make(EMPTY_TERMINAL_SESSION_STATE).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:state:null"),); export const EMPTY_KNOWN_TERMINAL_SESSIONS_ATOM = Atom.make(EMPTY_KNOWN_TERMINAL_SESSIONS).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:known:null"),); export const EMPTY_TERMINAL_ID_LIST_ATOM = Atom.make(EMPTY_TERMINAL_ID_LIST).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:running-terminal-ids:null"),); export function getKnownTerminalSessionTarget( target: TerminalSessionTarget,): KnownTerminalSessionTarget | null { if (target.environmentId === null || target.threadId === null || target.terminalId === null) { return null; } return { environmentId: target.environmentId, threadId: target.threadId, terminalId: target.terminalId, };} export function getKnownTerminalSessionListFilter( filter: TerminalSessionListFilter,): KnownTerminalSessionListFilter | null { if (filter.environmentId === null) { return null; } return { environmentId: filter.environmentId, threadId: filter.threadId ?? null, terminalId: filter.terminalId ?? null, };} function knownTargetFromSummary( environmentId: EnvironmentId, summary: TerminalSummary,): KnownTerminalSessionTarget { return { environmentId, threadId: ThreadId.make(summary.threadId), terminalId: summary.terminalId, };} function keyFromKnownTarget(target: KnownTerminalSessionTarget): string { return `${target.environmentId}:${target.threadId}:${target.terminalId}`;} function trimBufferToBytes(buffer: string, maxBufferBytes: number): string { if (maxBufferBytes <= 0) { return ""; } const encoded = textEncoder.encode(buffer); if (encoded.byteLength <= maxBufferBytes) { return buffer; } let start = encoded.byteLength - maxBufferBytes; while (start < encoded.length) { const byte = encoded[start]; if (byte === undefined || (byte & 0b1100_0000) !== 0b1000_0000) { break; } start += 1; } return textDecoder.decode(encoded.subarray(start));} function bufferFromSnapshot( snapshot: TerminalSessionSnapshot, maxBufferBytes: number,): TerminalBufferState { return { buffer: trimBufferToBytes(snapshot.history, maxBufferBytes), status: snapshot.status, error: null, updatedAt: snapshot.updatedAt, version: 1, };} function latestTimestamp(left: string | null, right: string | null): string | null { if (left === null) return right; if (right === null) return left; return Date.parse(left) >= Date.parse(right) ? left : right;} function combineSessionState( summary: TerminalSummary | null, buffer: TerminalBufferState,): TerminalSessionState { return { summary, buffer: buffer.buffer, status: summary?.status ?? buffer.status, error: buffer.error, hasRunningSubprocess: summary?.hasRunningSubprocess ?? false, updatedAt: latestTimestamp(summary?.updatedAt ?? null, buffer.updatedAt), version: buffer.version, };} function listKnownSessionsFromMetadata( metadata: Record<string, KnownTerminalMetadata>, getBuffer: (target: KnownTerminalSessionTarget) => TerminalBufferState, filter?: Partial<KnownTerminalSessionTarget>,): ReadonlyArray<KnownTerminalSession> { return pipe( Object.values(metadata), Arr.filterMap(({ target, summary }) => { if (filter?.environmentId && target.environmentId !== filter.environmentId) { return Result.failVoid; } if (filter?.threadId && target.threadId !== filter.threadId) { return Result.failVoid; } if (filter?.terminalId && target.terminalId !== filter.terminalId) { return Result.failVoid; } return Result.succeed({ target, state: combineSessionState(summary, getBuffer(target)), }); }), Arr.sort(knownTerminalSessionOrder), );} export const terminalSessionStateAtom = Atom.family((target: KnownTerminalSessionTarget) => Atom.make((get) => { const targetKey = keyFromKnownTarget(target); return combineSessionState( get(terminalSessionMetadataAtom(target.environmentId))[targetKey]?.summary ?? null, get(terminalSessionBufferAtom(target)), ); }).pipe(Atom.keepAlive, Atom.withLabel(`terminal-session:state:${keyFromKnownTarget(target)}`)),); export const knownTerminalSessionsAtom = Atom.family((filter: KnownTerminalSessionListFilter) => Atom.make((get) => listKnownSessionsFromMetadata( get(terminalSessionMetadataAtom(filter.environmentId)), (target) => get(terminalSessionBufferAtom(target)), { environmentId: filter.environmentId, ...(filter.threadId !== null ? { threadId: filter.threadId } : {}), ...(filter.terminalId !== null ? { terminalId: filter.terminalId } : {}), }, ), ).pipe(Atom.keepAlive, Atom.withLabel(`terminal-session:known:${JSON.stringify(filter)}`)),); export const runningTerminalIdsAtom = Atom.family((filter: KnownTerminalSessionListFilter) => Atom.make((get) => { return pipe( Object.values(get(terminalSessionMetadataAtom(filter.environmentId))), Arr.filterMap((entry) => entry.target.environmentId === filter.environmentId && (filter.threadId === null || entry.target.threadId === filter.threadId) && (filter.terminalId === null || entry.target.terminalId === filter.terminalId) && entry.summary.hasRunningSubprocess ? Result.succeed(entry.target.terminalId) : Result.failVoid, ), Arr.sort(Order.String), ); }).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:running-terminal-ids:${JSON.stringify(filter)}`), ),); export function createTerminalSessionManager(config: TerminalSessionManagerConfig) { const maxBufferBytes = config.maxBufferBytes ?? DEFAULT_MAX_BUFFER_BYTES; function getMetadata(environmentId: EnvironmentId): Record<string, KnownTerminalMetadata> { return config.getRegistry().get(terminalSessionMetadataAtom(environmentId)); } function setMetadata( environmentId: EnvironmentId, next: Record<string, KnownTerminalMetadata>, ): void { config.getRegistry().set(terminalSessionMetadataAtom(environmentId), next); } function getBuffer(target: KnownTerminalSessionTarget): TerminalBufferState { return config.getRegistry().get(terminalSessionBufferAtom(target)); } function setBuffer(target: KnownTerminalSessionTarget, next: TerminalBufferState): void { config.getRegistry().set(terminalSessionBufferAtom(target), next); } function getSnapshot(target: TerminalSessionTarget): TerminalSessionState { const knownTarget = getKnownTerminalSessionTarget(target); if (knownTarget === null) { return EMPTY_TERMINAL_SESSION_STATE; } return combineSessionState( getMetadata(knownTarget.environmentId)[keyFromKnownTarget(knownTarget)]?.summary ?? null, getBuffer(knownTarget), ); } function syncSnapshot( target: Pick<TerminalSessionTarget, "environmentId">, snapshot: TerminalSessionSnapshot, ): void { const knownTarget = getKnownTerminalSessionTarget({ environmentId: target.environmentId, threadId: ThreadId.make(snapshot.threadId), terminalId: snapshot.terminalId, }); if (knownTarget === null) { return; } setBuffer(knownTarget, bufferFromSnapshot(snapshot, maxBufferBytes)); } function applyMetadataEvent( target: Pick<TerminalSessionTarget, "environmentId">, event: TerminalMetadataStreamEvent, ): void { const environmentId = target.environmentId; if (environmentId === null) { return; } if (event.type === "snapshot") { const retainedKeys = new Set<string>(); const next = { ...getMetadata(environmentId) }; for (const terminal of event.terminals) { const knownTarget = knownTargetFromSummary(environmentId, terminal); const targetKey = keyFromKnownTarget(knownTarget); retainedKeys.add(targetKey); next[targetKey] = { target: knownTarget, summary: terminal, }; } for (const key of Object.keys(next)) { if (!retainedKeys.has(key)) { delete next[key]; } } setMetadata(environmentId, next); return; } if (event.type === "upsert") { const knownTarget = knownTargetFromSummary(environmentId, event.terminal); const targetKey = keyFromKnownTarget(knownTarget); setMetadata(environmentId, { ...getMetadata(environmentId), [targetKey]: { target: knownTarget, summary: event.terminal, }, }); return; } const knownTarget = getKnownTerminalSessionTarget({ environmentId, threadId: ThreadId.make(event.threadId), terminalId: event.terminalId, }); if (knownTarget === null) { return; } const next = { ...getMetadata(environmentId) }; delete next[keyFromKnownTarget(knownTarget)]; setMetadata(environmentId, next); } function applyAttachEvent( target: Pick<TerminalSessionTarget, "environmentId">, event: TerminalAttachStreamEvent, ): void { if (event.type === "snapshot") { syncSnapshot(target, event.snapshot); return; } const knownTarget = getKnownTerminalSessionTarget({ environmentId: target.environmentId, threadId: ThreadId.make(event.threadId), terminalId: event.terminalId, }); if (knownTarget === null) { return; } const current = getBuffer(knownTarget); switch (event.type) { case "restarted": setBuffer(knownTarget, bufferFromSnapshot(event.snapshot, maxBufferBytes)); return; case "output": setBuffer(knownTarget, { ...current, buffer: trimBufferToBytes(`${current.buffer}${event.data}`, maxBufferBytes), status: current.status === "closed" ? "running" : current.status, error: null, version: current.version + 1, }); return; case "cleared": setBuffer(knownTarget, { ...current, buffer: "", error: null, version: current.version + 1, }); return; case "exited": setBuffer(knownTarget, { ...current, status: "exited", error: null, version: current.version + 1, }); return; case "closed": setBuffer(knownTarget, { ...current, status: "closed", error: null, version: current.version + 1, }); return; case "error": setBuffer(knownTarget, { ...current, status: "error", error: event.message,Lines 1–500 of 605. Load more
import type { TerminalAttachStreamEvent, TerminalMetadataStreamEvent, TerminalSessionSnapshot, TerminalSummary, EnvironmentId, } from "@t3tools/contracts"; import { ThreadId, type TerminalAttachInput } from "@t3tools/contracts"; import * as Arr from "effect/Array"; import { pipe } from "effect/Function"; import * as Order from "effect/Order"; import * as Result from "effect/Result"; import { Atom, type AtomRegistry } from "effect/unstable/reactivity"; export interface TerminalSessionState { readonly summary: TerminalSummary | null; readonly buffer: string; readonly status: TerminalSessionSnapshot["status"] | "closed"; readonly error: string | null; readonly hasRunningSubprocess: boolean; readonly updatedAt: string | null; readonly version: number; } export interface TerminalBufferState { readonly buffer: string; readonly status: TerminalSessionSnapshot["status"] | "closed"; readonly error: string | null; readonly updatedAt: string | null; readonly version: number; } export interface TerminalSessionTarget { readonly environmentId: EnvironmentId | null; readonly threadId: ThreadId | null; readonly terminalId: string | null; } export interface KnownTerminalSessionTarget { readonly environmentId: EnvironmentId; readonly threadId: ThreadId; readonly terminalId: string; } export interface KnownTerminalSession { readonly target: KnownTerminalSessionTarget; readonly state: TerminalSessionState; } export interface KnownTerminalMetadata { readonly target: KnownTerminalSessionTarget; readonly summary: TerminalSummary; } export interface TerminalSessionListFilter { readonly environmentId: EnvironmentId | null; readonly threadId?: ThreadId | null; readonly terminalId?: string | null; } export interface KnownTerminalSessionListFilter { readonly environmentId: EnvironmentId; readonly threadId: ThreadId | null; readonly terminalId: string | null; } export interface TerminalSessionManagerConfig { readonly getRegistry: () => AtomRegistry.AtomRegistry; readonly maxBufferBytes?: number; } export interface TerminalMetadataClient { readonly terminal: { readonly onMetadata: ( listener: (event: TerminalMetadataStreamEvent) => void, options?: { readonly onResubscribe?: () => void }, ) => () => void; }; } export interface TerminalAttachClient { readonly terminal: { readonly attach: ( input: TerminalAttachInput, listener: (event: TerminalAttachStreamEvent) => void, options?: { readonly onResubscribe?: () => void }, ) => () => void; }; } export const EMPTY_TERMINAL_BUFFER_STATE = Object.freeze<TerminalBufferState>({ buffer: "", status: "closed", error: null, updatedAt: null, version: 0, }); export const EMPTY_TERMINAL_SESSION_STATE = Object.freeze<TerminalSessionState>({ summary: null, buffer: "", status: "closed", error: null, hasRunningSubprocess: false, updatedAt: null, version: 0, }); const EMPTY_KNOWN_TERMINAL_SESSIONS = Object.freeze<Array<KnownTerminalSession>>([]); const EMPTY_TERMINAL_ID_LIST = Object.freeze<Array<string>>([]); const DEFAULT_MAX_BUFFER_BYTES = 512 * 1024; const knownTerminalMetadataEnvironmentIds = new Set<EnvironmentId>(); const knownTerminalBufferTargets = new Map<string, KnownTerminalSessionTarget>(); const textEncoder = new TextEncoder(); const textDecoder = new TextDecoder(); const terminalIdOrder = Order.make<string>( (left, right) => left.localeCompare(right, undefined, { numeric: true }) as -1 | 0 | 1, ); const knownTerminalSessionOrder = Order.mapInput( terminalIdOrder, (session: KnownTerminalSession) => session.target.terminalId, ); export const terminalSessionMetadataAtom = Atom.family((environmentId: EnvironmentId) => { knownTerminalMetadataEnvironmentIds.add(environmentId); return Atom.make<Record<string, KnownTerminalMetadata>>({}).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:metadata:${environmentId}`), ); }); export const terminalSessionBufferAtom = Atom.family((target: KnownTerminalSessionTarget) => { const key = keyFromKnownTarget(target); knownTerminalBufferTargets.set(key, target); return Atom.make(EMPTY_TERMINAL_BUFFER_STATE).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:buffer:${key}`), ); }); export const EMPTY_TERMINAL_BUFFER_ATOM = Atom.make(EMPTY_TERMINAL_BUFFER_STATE).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:buffer:null"), ); export const EMPTY_TERMINAL_SESSION_ATOM = Atom.make(EMPTY_TERMINAL_SESSION_STATE).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:state:null"), ); export const EMPTY_KNOWN_TERMINAL_SESSIONS_ATOM = Atom.make(EMPTY_KNOWN_TERMINAL_SESSIONS).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:known:null"), ); export const EMPTY_TERMINAL_ID_LIST_ATOM = Atom.make(EMPTY_TERMINAL_ID_LIST).pipe( Atom.keepAlive, Atom.withLabel("terminal-session:running-terminal-ids:null"), ); export function getKnownTerminalSessionTarget( target: TerminalSessionTarget, ): KnownTerminalSessionTarget | null { if (target.environmentId === null || target.threadId === null || target.terminalId === null) { return null; } return { environmentId: target.environmentId, threadId: target.threadId, terminalId: target.terminalId, }; } export function getKnownTerminalSessionListFilter( filter: TerminalSessionListFilter, ): KnownTerminalSessionListFilter | null { if (filter.environmentId === null) { return null; } return { environmentId: filter.environmentId, threadId: filter.threadId ?? null, terminalId: filter.terminalId ?? null, }; } function knownTargetFromSummary( environmentId: EnvironmentId, summary: TerminalSummary, ): KnownTerminalSessionTarget { return { environmentId, threadId: ThreadId.make(summary.threadId), terminalId: summary.terminalId, }; } function keyFromKnownTarget(target: KnownTerminalSessionTarget): string { return `${target.environmentId}:${target.threadId}:${target.terminalId}`; } function trimBufferToBytes(buffer: string, maxBufferBytes: number): string { if (maxBufferBytes <= 0) { return ""; } const encoded = textEncoder.encode(buffer); if (encoded.byteLength <= maxBufferBytes) { return buffer; } let start = encoded.byteLength - maxBufferBytes; while (start < encoded.length) { const byte = encoded[start]; if (byte === undefined || (byte & 0b1100_0000) !== 0b1000_0000) { break; } start += 1; } return textDecoder.decode(encoded.subarray(start)); } function bufferFromSnapshot( snapshot: TerminalSessionSnapshot, maxBufferBytes: number, ): TerminalBufferState { return { buffer: trimBufferToBytes(snapshot.history, maxBufferBytes), status: snapshot.status, error: null, updatedAt: snapshot.updatedAt, version: 1, }; } function latestTimestamp(left: string | null, right: string | null): string | null { if (left === null) return right; if (right === null) return left; return Date.parse(left) >= Date.parse(right) ? left : right; } function combineSessionState( summary: TerminalSummary | null, buffer: TerminalBufferState, ): TerminalSessionState { return { summary, buffer: buffer.buffer, status: summary?.status ?? buffer.status, error: buffer.error, hasRunningSubprocess: summary?.hasRunningSubprocess ?? false, updatedAt: latestTimestamp(summary?.updatedAt ?? null, buffer.updatedAt), version: buffer.version, }; } function listKnownSessionsFromMetadata( metadata: Record<string, KnownTerminalMetadata>, getBuffer: (target: KnownTerminalSessionTarget) => TerminalBufferState, filter?: Partial<KnownTerminalSessionTarget>, ): ReadonlyArray<KnownTerminalSession> { return pipe( Object.values(metadata), Arr.filterMap(({ target, summary }) => { if (filter?.environmentId && target.environmentId !== filter.environmentId) { return Result.failVoid; } if (filter?.threadId && target.threadId !== filter.threadId) { return Result.failVoid; } if (filter?.terminalId && target.terminalId !== filter.terminalId) { return Result.failVoid; } return Result.succeed({ target, state: combineSessionState(summary, getBuffer(target)), }); }), Arr.sort(knownTerminalSessionOrder), ); } export const terminalSessionStateAtom = Atom.family((target: KnownTerminalSessionTarget) => Atom.make((get) => { const targetKey = keyFromKnownTarget(target); return combineSessionState( get(terminalSessionMetadataAtom(target.environmentId))[targetKey]?.summary ?? null, get(terminalSessionBufferAtom(target)), ); }).pipe(Atom.keepAlive, Atom.withLabel(`terminal-session:state:${keyFromKnownTarget(target)}`)), ); export const knownTerminalSessionsAtom = Atom.family((filter: KnownTerminalSessionListFilter) => Atom.make((get) => listKnownSessionsFromMetadata( get(terminalSessionMetadataAtom(filter.environmentId)), (target) => get(terminalSessionBufferAtom(target)), { environmentId: filter.environmentId, ...(filter.threadId !== null ? { threadId: filter.threadId } : {}), ...(filter.terminalId !== null ? { terminalId: filter.terminalId } : {}), }, ), ).pipe(Atom.keepAlive, Atom.withLabel(`terminal-session:known:${JSON.stringify(filter)}`)), ); export const runningTerminalIdsAtom = Atom.family((filter: KnownTerminalSessionListFilter) => Atom.make((get) => { return pipe( Object.values(get(terminalSessionMetadataAtom(filter.environmentId))), Arr.filterMap((entry) => entry.target.environmentId === filter.environmentId && (filter.threadId === null || entry.target.threadId === filter.threadId) && (filter.terminalId === null || entry.target.terminalId === filter.terminalId) && entry.summary.hasRunningSubprocess ? Result.succeed(entry.target.terminalId) : Result.failVoid, ), Arr.sort(Order.String), ); }).pipe( Atom.keepAlive, Atom.withLabel(`terminal-session:running-terminal-ids:${JSON.stringify(filter)}`), ), ); export function createTerminalSessionManager(config: TerminalSessionManagerConfig) { const maxBufferBytes = config.maxBufferBytes ?? DEFAULT_MAX_BUFFER_BYTES; function getMetadata(environmentId: EnvironmentId): Record<string, KnownTerminalMetadata> { return config.getRegistry().get(terminalSessionMetadataAtom(environmentId)); } function setMetadata( environmentId: EnvironmentId, next: Record<string, KnownTerminalMetadata>, ): void { config.getRegistry().set(terminalSessionMetadataAtom(environmentId), next); } function getBuffer(target: KnownTerminalSessionTarget): TerminalBufferState { return config.getRegistry().get(terminalSessionBufferAtom(target)); } function setBuffer(target: KnownTerminalSessionTarget, next: TerminalBufferState): void { config.getRegistry().set(terminalSessionBufferAtom(target), next); } function getSnapshot(target: TerminalSessionTarget): TerminalSessionState { const knownTarget = getKnownTerminalSessionTarget(target); if (knownTarget === null) { return EMPTY_TERMINAL_SESSION_STATE; } return combineSessionState( getMetadata(knownTarget.environmentId)[keyFromKnownTarget(knownTarget)]?.summary ?? null, getBuffer(knownTarget), ); } function syncSnapshot( target: Pick<TerminalSessionTarget, "environmentId">, snapshot: TerminalSessionSnapshot, ): void { const knownTarget = getKnownTerminalSessionTarget({ environmentId: target.environmentId, threadId: ThreadId.make(snapshot.threadId), terminalId: snapshot.terminalId, }); if (knownTarget === null) { return; } setBuffer(knownTarget, bufferFromSnapshot(snapshot, maxBufferBytes)); } function applyMetadataEvent( target: Pick<TerminalSessionTarget, "environmentId">, event: TerminalMetadataStreamEvent, ): void { const environmentId = target.environmentId; if (environmentId === null) { return; } if (event.type === "snapshot") { const retainedKeys = new Set<string>(); const next = { ...getMetadata(environmentId) }; for (const terminal of event.terminals) { const knownTarget = knownTargetFromSummary(environmentId, terminal); const targetKey = keyFromKnownTarget(knownTarget); retainedKeys.add(targetKey); next[targetKey] = { target: knownTarget, summary: terminal, }; } for (const key of Object.keys(next)) { if (!retainedKeys.has(key)) { delete next[key]; } } setMetadata(environmentId, next); return; } if (event.type === "upsert") { const knownTarget = knownTargetFromSummary(environmentId, event.terminal); const targetKey = keyFromKnownTarget(knownTarget); setMetadata(environmentId, { ...getMetadata(environmentId), [targetKey]: { target: knownTarget, summary: event.terminal, }, }); return; } const knownTarget = getKnownTerminalSessionTarget({ environmentId, threadId: ThreadId.make(event.threadId), terminalId: event.terminalId, }); if (knownTarget === null) { return; } const next = { ...getMetadata(environmentId) }; delete next[keyFromKnownTarget(knownTarget)]; setMetadata(environmentId, next); } function applyAttachEvent( target: Pick<TerminalSessionTarget, "environmentId">, event: TerminalAttachStreamEvent, ): void { if (event.type === "snapshot") { syncSnapshot(target, event.snapshot); return; } const knownTarget = getKnownTerminalSessionTarget({ environmentId: target.environmentId, threadId: ThreadId.make(event.threadId), terminalId: event.terminalId, }); if (knownTarget === null) { return; } const current = getBuffer(knownTarget); switch (event.type) { case "restarted": setBuffer(knownTarget, bufferFromSnapshot(event.snapshot, maxBufferBytes)); return; case "output": setBuffer(knownTarget, { ...current, buffer: trimBufferToBytes(`${current.buffer}${event.data}`, maxBufferBytes), status: current.status === "closed" ? "running" : current.status, error: null, version: current.version + 1, }); return; case "cleared": setBuffer(knownTarget, { ...current, buffer: "", error: null, version: current.version + 1, }); return; case "exited": setBuffer(knownTarget, { ...current, status: "exited", error: null, version: current.version + 1, }); return; case "closed": setBuffer(knownTarget, { ...current, status: "closed", error: null, version: current.version + 1, }); return; case "error": setBuffer(knownTarget, { ...current, status: "error", error: event.message,