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import { ok, err, Result } from "neverthrow";
import type {
AskResponse,
Capability,
CatalogResponse,
ConfigResponse,
ConfigUpdateResponse,
DocumentResult,
DocumentsResponse,
GenerationOptions,
InstalledResponse,
Message,
ModelShowResponse,
ModelsResponse,
ModelTask,
SearchChunkType,
SourceContent,
SSEEvent,
StatusResponse,
SyncOptions,
LintResult,
DraftAcceptResponse,
DraftInfoResponse,
DraftRejectResponse,
WikiBuildResult,
WikiCitationChain,
WikiPage,
WikiPageDetail,
WikiStatusResult,
WikiSynthesizeResult,
} from "./types";
const DEFAULT_TIMEOUT_MS = 15_000;
const RETRY_COUNT = 2;
const RETRY_BACKOFF_MS = 500;
/**
* Thrown when the server rejects a request with 401 / 403 after the plugin's
* auto-retry + token-refresh has failed. Signals that the stored session token
* (manualToken or auto-discovered) is stale and the user needs to paste a new
* one in Settings → Session token. Catchers should surface a targeted notice.
*/
export class SessionTokenError extends Error {
readonly status: number;
constructor(status: number, body: string) {
super(`Session token invalid (HTTP ${status}): ${body}`);
this.name = ERROR_NAME.SESSION_TOKEN;
this.status = status;
}
}
/**
* Thrown when a request is attempted before the managed server has reported
* its random listen port. Lets callers (settings UI, status bar) render a
* "starting…" state instead of firing requests at the default port.
*/
export class ServerStartingError extends Error {
constructor() {
super("Server is still starting up");
this.name = ERROR_NAME.SERVER_STARTING;
}
}
/**
* Thrown when the server returns HTTP 429 (e.g. a streaming endpoint already
* has a stream in flight from another client). Carries the optional Retry-After
* value in seconds so callers can include it in user copy. Never auto-retried —
* the bead contract is "surface gracefully, do not silently retry-loop".
*/
export class RateLimitedError extends Error {
readonly retryAfterSeconds: number | null;
constructor(retryAfterSeconds: number | null = null) {
super("lilbee is busy with another request");
this.name = ERROR_NAME.RATE_LIMITED;
this.retryAfterSeconds = retryAfterSeconds;
}
}
export type RequestOutcome = "ok" | "auth_error" | "server_error" | "unreachable" | "starting";
export class LilbeeClient {
private token: string | null = null;
private tokenProvider: (() => string | null) | null = null;
private outcomeCb: ((o: RequestOutcome) => void) | null = null;
private capabilityCache: Map<Capability, boolean> = new Map();
constructor(
private baseUrl: string,
token?: string,
) {
if (token) this.token = token;
}
setToken(token: string | null): void {
this.token = token;
}
setTokenProvider(provider: (() => string | null) | null): void {
this.tokenProvider = provider;
}
/** Subscribe to the outcome of every ``fetchWithRetry`` call. */
setOutcomeCallback(cb: ((o: RequestOutcome) => void) | null): void {
this.outcomeCb = cb;
}
private recordOutcome(outcome: RequestOutcome): void {
this.outcomeCb?.(outcome);
}
/** Repoint the client at a new base URL in place — lets the wizard update
* the target server without tearing down the existing client instance. */
setBaseUrl(url: string): void {
this.baseUrl = url;
}
private authHeaders(): Record<string, string> {
if (!this.token) return {};
return { Authorization: `Bearer ${this.token}` };
}
private refreshTokenFromProvider(): boolean {
if (!this.tokenProvider) return false;
const next = this.tokenProvider();
if (next === null || next === this.token) return false;
this.token = next;
return true;
}
private applyRefreshedToken(init: RequestInit | undefined): RequestInit {
const base = { ...init };
const existing = (base.headers ?? {}) as Record<string, string>;
if (existing.Authorization) {
base.headers = { ...existing, Authorization: `Bearer ${this.token}` };
}
return base;
}
private async assertOk(res: Response): Promise<Response> {
if (res.status === 429) {
const header = res.headers.get("Retry-After");
const seconds = header ? parseInt(header, 10) : NaN;
throw new RateLimitedError(Number.isFinite(seconds) ? seconds : null);
}
if (!res.ok) {
const text = await res.text().catch(() => "");
throw new Error(`Server responded ${res.status}: ${text}`);
}
return res;
}
private async fetchResult<T>(
url: string,
init?: RequestInit,
opts?: { stream?: boolean; signal?: AbortSignal },
): Promise<Result<T, Error>> {
try {
const res = await this.fetchWithRetry(url, init, opts);
const value = (await res.json()) as T;
return ok(value);
} catch (e) {
return err(e instanceof Error ? e : new Error(String(e)));
}
}
/**
* Fetch with automatic retry on network errors and a default timeout.
* Does NOT retry on HTTP error responses (4xx/5xx) — only on fetch failures
* (e.g. connection refused, DNS failure, timeout).
* SSE streams should pass `stream: true` to skip the timeout.
*/
async fetchWithRetry(
url: string,
init?: RequestInit,
opts?: { stream?: boolean; signal?: AbortSignal },
): Promise<Response> {
if (!this.baseUrl) {
this.recordOutcome("starting");
throw new ServerStartingError();
}
const maxAttempts = RETRY_COUNT + 1;
let lastError: unknown;
let authRetried = false;
for (let attempt = 0; attempt < maxAttempts; attempt++) {
if (attempt > 0) {
await new Promise((r) => setTimeout(r, RETRY_BACKOFF_MS * attempt));
}
try {
const fetchInit = { ...init };
let timer: ReturnType<typeof setTimeout> | undefined;
if (opts?.signal) {
fetchInit.signal = opts.signal;
} else if (!opts?.stream) {
const controller = new AbortController();
fetchInit.signal = controller.signal;
timer = setTimeout(() => controller.abort(), DEFAULT_TIMEOUT_MS);
}
try {
const res = await globalThis.fetch(url, fetchInit);
if ((res.status === 401 || res.status === 403) && !authRetried && this.refreshTokenFromProvider()) {
authRetried = true;
init = this.applyRefreshedToken(init);
continue;
}
if (res.status === 401 || res.status === 403) {
// Either no provider, provider returned the same token, or refreshed
// token still failed. The stored session token is stale — surface a
// typed error so the UI can tell the user what to do.
const text = await res.text().catch(() => "");
this.recordOutcome("auth_error");
throw new SessionTokenError(res.status, text);
}
const okRes = await this.assertOk(res);
this.recordOutcome("ok");
return okRes;
} finally {
if (timer !== undefined) clearTimeout(timer);
}
} catch (err) {
lastError = err;
if (err instanceof SessionTokenError) {
throw err;
}
if (err instanceof RateLimitedError) {
this.recordOutcome("server_error");
throw err;
}
if (err instanceof Error && err.message.startsWith("Server responded")) {
this.recordOutcome("server_error");
throw err;
}
if (err instanceof Error && err.name === ERROR_NAME.ABORT_ERROR) {
throw err;
}
}
}
this.recordOutcome("unreachable");
throw lastError;
}
async health(): Promise<Result<{ status: string; version: string }, Error>> {
return this.fetchResult(`${this.baseUrl}/api/health`);
}
async status(): Promise<Result<StatusResponse, Error>> {
return this.fetchResult(`${this.baseUrl}/api/status`);
}
/** Cached per session; fail-open on probe error (showing a section that won't work degrades better than hiding one the user needs). */
async getCapability(cap: Capability): Promise<boolean> {
const cached = this.capabilityCache.get(cap);
if (cached !== undefined) return cached;
let value: boolean;
try {
value = await this.probeCapability(cap);
} catch {
value = true;
}
this.capabilityCache.set(cap, value);
return value;
}
invalidateCapability(cap?: Capability): void {
if (cap === undefined) {
this.capabilityCache.clear();
return;
}
this.capabilityCache.delete(cap);
}
private async probeCapability(cap: Capability): Promise<boolean> {
switch (cap) {
case CAPABILITY.API_KEYS:
return this.probeLitellmInstalled();
case CAPABILITY.CRAWLING:
return this.probeCrawlerInstalled();
case CAPABILITY.WIKI:
return this.probeWikiEnabled();
}
}
private async probeLitellmInstalled(): Promise<boolean> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/models/external`);
const body = (await res.json()) as { models?: unknown; error?: unknown };
return body.error === null || body.error === undefined;
}
private async probeCrawlerInstalled(): Promise<boolean> {
const res = await this.fetchWithRetry(`${this.baseUrl}/setup/crawler/status`);
const body = (await res.json()) as { package_installed?: boolean };
return body.package_installed === true;
}
private async probeWikiEnabled(): Promise<boolean> {
const cfg = await this.config();
return cfg.wiki === true;
}
async search(query: string, topK?: number, chunkType?: SearchChunkType): Promise<DocumentResult[]> {
const params = new URLSearchParams({ q: query });
if (topK !== undefined) params.set("top_k", String(topK));
if (chunkType && chunkType !== SEARCH_CHUNK_TYPE.ALL) params.set("chunk_type", chunkType);
const res = await this.fetchWithRetry(`${this.baseUrl}/api/search?${params}`);
return res.json();
}
async chat(question: string, history: Message[], topK?: number): Promise<AskResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/chat`, {
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ question, history, top_k: topK ?? 0 }),
});
return res.json();
}
async *chatStream(
question: string,
history: Message[],
topK?: number,
signal?: AbortSignal,
options?: GenerationOptions,
chunkType?: SearchChunkType,
): AsyncGenerator<SSEEvent> {
const body: Record<string, unknown> = { question, history, top_k: topK ?? 0 };
if (options && Object.keys(options).length > 0) body.options = options;
// "all" is the UI-side label for no filter; the field is omitted on the wire.
if (chunkType && chunkType !== SEARCH_CHUNK_TYPE.ALL) body.chunk_type = chunkType;
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/chat/stream`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify(body),
},
{ stream: true, signal },
);
yield* this.parseSSE(res);
}
async *addFiles(
paths: string[],
force = false,
enableOcr?: boolean | null,
signal?: AbortSignal,
ocrTimeout?: number | null,
): AsyncGenerator<SSEEvent> {
const body: Record<string, unknown> = { paths, force };
if (enableOcr !== undefined && enableOcr !== null) body.enable_ocr = enableOcr;
if (ocrTimeout !== undefined && ocrTimeout !== null) body.ocr_timeout = ocrTimeout;
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/add`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify(body),
},
{ stream: true, signal },
);
yield* this.parseSSE(res);
}
async *syncStream(
enableOcr?: boolean | null,
signal?: AbortSignal,
options?: SyncOptions,
): AsyncGenerator<SSEEvent> {
const body: Record<string, unknown> = {};
if (enableOcr !== undefined && enableOcr !== null) body.enable_ocr = enableOcr;
if (options?.forceRebuild) body.force_rebuild = true;
if (options?.retrySkipped) body.retry_skipped = true;
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/sync`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify(body),
},
{ stream: true, signal },
);
yield* this.parseSSE(res);
}
async listModels(): Promise<ModelsResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/models`);
return res.json();
}
async *pullModel(model: string, source = "native", signal?: AbortSignal): AsyncGenerator<SSEEvent> {
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/models/pull`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model, source }),
signal,
},
{ stream: true },
);
yield* this.parseSSE(res);
}
async setChatModel(model: string): Promise<Result<void, Error>> {
return this.fetchResult<void>(`${this.baseUrl}/api/models/chat`, {
method: "PUT",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model }),
});
}
async catalog(params?: {
task?: ModelTask;
search?: string;
size?: "small" | "medium" | "large";
sort?: "featured" | "downloads" | "name" | "size_asc" | "size_desc";
featured?: boolean;
limit?: number;
offset?: number;
}): Promise<Result<CatalogResponse, Error>> {
const qs = new URLSearchParams();
if (params?.task) qs.set("task", params.task);
if (params?.search) qs.set("search", params.search);
if (params?.size) qs.set("size", params.size);
if (params?.sort) qs.set("sort", params.sort);
if (params?.featured !== undefined) qs.set("featured", String(params.featured));
if (params?.limit !== undefined) qs.set("limit", String(params.limit));
if (params?.offset !== undefined) qs.set("offset", String(params.offset));
const suffix = qs.toString() ? `?${qs}` : "";
return this.fetchResult<CatalogResponse>(`${this.baseUrl}/api/models/catalog${suffix}`);
}
async installedModels(params?: { task?: ModelTask }): Promise<InstalledResponse> {
const qs = new URLSearchParams();
if (params?.task) qs.set("task", params.task);
const suffix = qs.toString() ? `?${qs}` : "";
const res = await this.fetchWithRetry(`${this.baseUrl}/api/models/installed${suffix}`);
return res.json();
}
async showModel(model: string): Promise<ModelShowResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/models/show`, {
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model }),
});
return res.json();
}
async deleteModel(
model: string,
source = "native",
): Promise<Result<{ deleted: boolean; model: string; freed_gb: number }, Error>> {
return this.fetchResult(`${this.baseUrl}/api/models/${encodeURIComponent(model)}?source=${source}`, {
method: "DELETE",
headers: this.authHeaders(),
});
}
async listDocuments(search?: string, limit?: number, offset?: number): Promise<DocumentsResponse> {
const qs = new URLSearchParams();
if (search) qs.set("search", search);
if (limit !== undefined) qs.set("limit", String(limit));
if (offset !== undefined) qs.set("offset", String(offset));
const suffix = qs.toString() ? `?${qs}` : "";
const res = await this.fetchWithRetry(`${this.baseUrl}/api/documents${suffix}`, {
headers: this.authHeaders(),
});
return res.json();
}
async removeDocuments(names: string[], deleteFiles = false): Promise<{ removed: number; not_found: string[] }> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/documents/remove`, {
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ names, delete_files: deleteFiles }),
});
return res.json();
}
async *crawl(
url: string,
depth?: number | null,
maxPages?: number | null,
signal?: AbortSignal,
): AsyncGenerator<SSEEvent> {
const body: Record<string, unknown> = { url };
if (depth !== undefined) body.depth = depth;
if (maxPages !== undefined) body.max_pages = maxPages;
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/crawl`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify(body),
signal,
},
{ stream: true },
);
yield* this.parseSSE(res);
}
async config(): Promise<ConfigResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/config`);
return res.json();
}
async configDefaults(): Promise<Record<string, unknown>> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/config/defaults`);
return res.json();
}
async updateConfig(updates: Record<string, unknown>): Promise<ConfigUpdateResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/config`, {
method: "PATCH",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify(updates),
});
return res.json();
}
async setEmbeddingModel(model: string): Promise<Result<void, Error>> {
return this.fetchResult<void>(`${this.baseUrl}/api/models/embedding`, {
method: "PUT",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model }),
});
}
async setRerankerModel(model: string): Promise<Result<void, Error>> {
return this.fetchResult<void>(`${this.baseUrl}/api/models/reranker`, {
method: "PUT",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model }),
});
}
async setVisionModel(model: string): Promise<Result<void, Error>> {
return this.fetchResult<void>(`${this.baseUrl}/api/models/vision`, {
method: "PUT",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ model }),
});
}
async wikiList(): Promise<WikiPage[]> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki`, { headers: this.authHeaders() });
return res.json();
}
async wikiPage(slug: string): Promise<WikiPageDetail> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/${encodeURIComponent(slug)}`, {
headers: this.authHeaders(),
});
return res.json();
}
async wikiCitations(slug: string): Promise<WikiCitationChain> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/${encodeURIComponent(slug)}/citations`, {
headers: this.authHeaders(),
});
return res.json();
}
async wikiCitationsForSource(filename: string): Promise<WikiCitationChain[]> {
const params = new URLSearchParams({ source: filename });
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/citations?${params}`, {
headers: this.authHeaders(),
});
return res.json();
}
async wikiLint(): Promise<LintResult> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/lint`, {
method: "POST",
headers: this.authHeaders(),
});
return res.json();
}
async wikiBuild(): Promise<WikiBuildResult> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/build`, {
method: "POST",
headers: this.authHeaders(),
});
return res.json();
}
async wikiUpdate(): Promise<WikiBuildResult> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/update`, {
method: "PATCH",
headers: this.authHeaders(),
});
return res.json();
}
async wikiStatus(): Promise<WikiStatusResult> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/status`, {
headers: this.authHeaders(),
});
return res.json();
}
async wikiSynthesize(): Promise<WikiSynthesizeResult> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/synthesize`, {
method: "POST",
headers: this.authHeaders(),
});
return res.json();
}
/**
* Fetch the rendered text of a source file (markdown / html / plaintext)
* as JSON. Used by the preview modal when the file is not in the vault.
*/
async getSource(source: string): Promise<SourceContent> {
const params = new URLSearchParams({ source });
const res = await this.fetchWithRetry(`${this.baseUrl}/api/source?${params}`, {
headers: this.authHeaders(),
});
return res.json();
}
/**
* Fetch the raw bytes of a source file with its original Content-Type.
* Returns the raw Response so callers can read `arrayBuffer()` or stream
* it into an `<object>` tag (e.g. PDFs in the preview modal).
*/
async getSourceRaw(source: string): Promise<Response> {
const params = new URLSearchParams({ source, raw: "1" });
return this.fetchWithRetry(`${this.baseUrl}/api/source?${params}`, {
headers: this.authHeaders(),
});
}
async *wikiGenerate(source: string, signal?: AbortSignal): AsyncGenerator<SSEEvent> {
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/wiki/generate`,
{
method: "POST",
headers: { ...JSON_HEADERS, ...this.authHeaders() },
body: JSON.stringify({ source }),
},
{ stream: true, signal },
);
yield* this.parseSSE(res);
}
async wikiDrafts(): Promise<DraftInfoResponse[]> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/drafts`, { headers: this.authHeaders() });
return res.json();
}
async wikiDraftDiff(slug: string): Promise<string> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/drafts/${encodeURIComponent(slug)}/diff`, {
headers: this.authHeaders(),
});
return res.text();
}
async wikiDraftAccept(slug: string): Promise<DraftAcceptResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/drafts/${encodeURIComponent(slug)}/accept`, {
method: "POST",
headers: this.authHeaders(),
});
return res.json();
}
async wikiDraftReject(slug: string): Promise<DraftRejectResponse> {
const res = await this.fetchWithRetry(`${this.baseUrl}/api/wiki/drafts/${encodeURIComponent(slug)}`, {
method: "DELETE",
headers: this.authHeaders(),
});
return res.json();
}
async *wikiPrune(signal?: AbortSignal): AsyncGenerator<SSEEvent> {
const res = await this.fetchWithRetry(
`${this.baseUrl}/api/wiki/prune`,
{
method: "POST",
headers: this.authHeaders(),
},
{ stream: true, signal },
);
yield* this.parseSSE(res);
}
private async *parseSSE(response: Response): AsyncGenerator<SSEEvent> {
if (!response.body) {
throw new Error("Response body is null");
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = "";
let currentEvent: string = SSE_EVENT.MESSAGE;
while (true) {
const { done, value } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
const lines = buffer.split("\n");
// split() always returns at least one element, so pop() is never undefined
buffer = lines.pop()!;
for (const line of lines) {
if (line.startsWith("event:")) {
currentEvent = (line.startsWith("event: ") ? line.slice(7) : line.slice(6)).trim();
} else if (line.startsWith("data:")) {
const raw = line.startsWith("data: ") ? line.slice(6) : line.slice(5);
try {
yield { event: currentEvent, data: JSON.parse(raw) };
} catch {
yield { event: currentEvent, data: raw };
}
currentEvent = SSE_EVENT.MESSAGE;
}
}
}
}
}
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