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import type {
TextFileContextResponse,
TextFileQuery,
TextFileResponse,
} from "@dispatch/transport-contract";
import type { TextFileClient, TextFileState } from "../types";
const MAX_BYTES = 262144;
const MAX_ENTRIES = 32;
const MAX_PARALLEL = 4;
interface Entry {
readonly listeners: Set<(state: TextFileState) => void>;
state: TextFileState;
controller: AbortController;
}
/** Per-mounted-chat, bounded cache: shared only by live references, never persisted. */
export function createTextFileClient(
apiBase: string,
conversationId: string,
fetchImpl: typeof fetch,
): TextFileClient {
const entries = new Map<string, Entry>();
let disposed = false;
let contextController = new AbortController();
let context: Promise<TextFileContextResponse> | null = null;
let active = 0;
const queue = new Map<string, () => void>();
const endpoint = `${apiBase.replace(/\/$/, "")}/conversations/${encodeURIComponent(conversationId)}`;
async function json(url: string, signal: AbortSignal): Promise<unknown> {
const response = await fetchImpl(url, { signal, cache: "no-store" });
const data: unknown = await response.json();
if (!response.ok) {
const error = data as { error?: string };
throw new Error(error.error ?? `Text file request failed (HTTP ${response.status})`);
}
return data;
}
function getContext(): Promise<TextFileContextResponse> {
context ??= json(`${endpoint}/text-file-context`, contextController.signal).then((data) => {
const c = data as TextFileContextResponse;
if (
c.conversationId !== conversationId ||
!(c.cwd === null || typeof c.cwd === "string") ||
!(c.computerId === null || typeof c.computerId === "string")
) {
throw new Error("Invalid text file context response");
}
return c;
});
return context;
}
function publish(entry: Entry, state: TextFileState): void {
entry.state = state;
for (const listener of entry.listeners) listener(state);
}
async function load(path: string, entry: Entry, controller: AbortController): Promise<void> {
try {
if (controller.signal.aborted || disposed) return;
const c = await getContext();
if (controller.signal.aborted || disposed) return;
if (c.computerId !== null)
throw new Error(
"Text-file embeds are not available for remote computers. No local file was read.",
);
const query: TextFileQuery = {
path,
expectedCwd: c.cwd ?? "",
expectedComputerId: c.computerId ?? "",
};
const params = new URLSearchParams(query as unknown as Record<string, string>);
const data = (await json(
`${endpoint}/text-file?${params}`,
controller.signal,
)) as TextFileResponse;
if (
typeof data.text !== "string" ||
typeof data.path !== "string" ||
!data.path.startsWith("/") ||
!["markdown", "text"].includes(data.format) ||
data.maxBytes !== MAX_BYTES ||
!Number.isInteger(data.bytes) ||
data.bytes < 0 ||
data.bytes > MAX_BYTES ||
new TextEncoder().encode(data.text).length !== data.bytes
) {
throw new Error("Invalid or oversized text file response (maximum 256 KiB)");
}
if (!controller.signal.aborted && !disposed) publish(entry, { kind: "ready", file: data });
} catch (error) {
if (!controller.signal.aborted && !disposed)
publish(entry, {
kind: "error",
message: error instanceof Error ? error.message : "Unable to read text file",
});
}
}
function drain(): void {
while (active < MAX_PARALLEL && queue.size) {
const next = queue.entries().next().value;
if (!next) return;
queue.delete(next[0]);
next[1]();
}
}
function start(path: string, entry: Entry): void {
entry.controller.abort();
const controller = new AbortController();
entry.controller = controller;
publish(entry, { kind: "loading" });
queue.set(path, () => {
if (controller.signal.aborted || disposed) return;
active++;
void load(path, entry, controller).finally(() => {
active--;
drain();
});
});
drain();
}
return {
subscribe(path, listener) {
if (disposed || (!entries.has(path) && entries.size >= MAX_ENTRIES)) {
listener({
kind: "error",
message: "Too many text-file embeds (maximum 32 active files).",
});
return () => {};
}
let entry = entries.get(path);
if (!entry) {
entry = {
listeners: new Set(),
state: { kind: "loading" },
controller: new AbortController(),
};
entries.set(path, entry);
start(path, entry);
}
entry.listeners.add(listener);
listener(entry.state);
const current = entry;
return () => {
current.listeners.delete(listener);
if (!current.listeners.size) {
current.controller.abort();
entries.delete(path);
queue.delete(path);
}
if (!entries.size) {
contextController.abort();
contextController = new AbortController();
context = null;
}
};
},
refresh(_path) {
// Refresh can reveal a context change: invalidate ALL live content before rereading.
contextController.abort();
contextController = new AbortController();
context = null;
for (const [path, entry] of entries) start(path, entry);
},
dispose() {
disposed = true;
contextController.abort();
for (const entry of entries.values()) entry.controller.abort();
entries.clear();
queue.clear();
},
};
}
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