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opencode v2 mirror
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TypeScript
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type SessionStore<T> = { get: (id: string) => T | undefined sync: (id: string, options?: { children?: boolean }) => Promise<unknown> message: { sync: (id: string) => Promise<unknown> } pending: { sync: (id: string) => Promise<unknown> }}
type Resolution<T> = { id: string; store: SessionStore<T> } & ( | { state: "pending" } | { state: "settled" } | { state: "failed"; failure: unknown })
// Reactive target session for the session route, read from the data store.// All session tabs on a server share one route instance, so the target session ID// changes in place; the effect is only a trigger that starts resolution for the// current target, and each run cancels the previous one through onCleanup so a// late result from an abandoned target is dropped. Resolution is imperative rather// than a resource on purpose: a resource created here would be created inside the// router's navigation transition, and suspending that transition deadlocks the URL// commit and double-mounts the session header portals from the transition's shadow// render.//// The returned accessor is a pure derivation. The sync cache is authoritative, and// status only applies while it matches the current target (store + session ID): on// navigation or store replacement the memo re-evaluates before the trigger runs,// so trusting a previous target's settlement would fabricate a not-found for a// session that simply has not resolved yet. Resolve failures rethrow on read so// the enclosing SessionRouteErrorBoundary renders the scoped session error.export function createSessionResolution<T>( sessionID: () => string | undefined, sessions: () => SessionStore<T>, options?: { children?: boolean; connected?: () => boolean },) { const cached = createMemo(() => { const id = sessionID() if (!id) return return sessions().get(id) }) const [status, setStatus] = createSignal<Resolution<T>>()
// Start independent reads before constructing the selected view, including // when its metadata is cached but its transcript has never been loaded. createRenderEffect( on([sessionID, sessions, () => options?.connected?.() ?? true] as const, ([id, store, connected]) => { if (!id || !connected) return let stale = false onCleanup(() => { stale = true }) // The timeline owns message errors; metadata resolution stays independent. Queued inputs // ride along so a reconnect refreshes them with the transcript instead of leaving the // pre-disconnect queue on screen. void store.message.sync(id).catch(() => undefined) void store.pending.sync(id).catch(() => undefined) if (cached() && !options?.children && !options?.connected) { setStatus({ id, store, state: "settled" }) return } setStatus({ id, store, state: "pending" }) store .sync(id, options) .then(() => { if (!stale) setStatus({ id, store, state: "settled" }) }) .catch((failure) => { if (!stale) setStatus({ id, store, state: "failed", failure }) }) }), )
return createMemo(() => { const id = sessionID() if (!id) return const value = cached() if (value) return value const state = status() if (!state || state.id !== id || state.store !== sessions()) return undefined if (state.state === "failed") throw state.failure // A session missing after settlement was deleted, possibly by another client. // Match the resolve error so the boundary shows the // session not found fallback. if (state.state === "settled") throw sessionNotFoundError(id) return undefined })}