2163 error spans on 0 routes in the last 7 days.
import type { CaptureMode, TimelineEntry } from './types';
// The buffer always captures everything; `mode` is a view-time filter only
// (applied in TimelineDebuggerTab). The ring keeps just the last 100 events so the
// timeline stays small and focused on the most recent flow.
const DEFAULT_CAPACITY = 100;
const MAIL_PATH_PREFIXES = [
'mail.',
'inbox.',
'threads.',
'thread.',
'labels.',
'label.',
'drafts.',
'draft.',
'messages.',
];
const MAIL_KEYS = new Set([
'threadData',
'threadIds',
'selectedThreadId',
'focusedIndex',
'newEmail',
'showImages',
'bulkSelected',
'selected',
'currentConversationList',
'value',
'highlight',
'folder',
'category',
]);
interface BufferState {
entries: TimelineEntry[];
writeIndex: number;
count: number;
capacity: number;
enabled: boolean;
paused: boolean;
mode: CaptureMode;
captureBodies: boolean;
version: number; // bumps on every push so subscribers can re-render
}
const STORAGE_KEY=[redacted];
const BODIES_STORAGE_KEY=[redacted];
function readPersistedFlag(key=[redacted], fallback: boolean): boolean {
if (typeof localStorage === 'undefined') return fallback;
try {
const v = localStorage.getItem(key);
if (v === null) return fallback;
return v === '1' || v === 'true';
} catch {
return fallback;
}
}
function writePersistedFlag(key=[redacted], value: boolean): void {
if (typeof localStorage === 'undefined') return;
try {
localStorage.setItem(key, value ? '1' : '0');
} catch {
// ignore
}
}
const isDev = typeof process !== 'undefined' && process.env.NODE_ENV === 'development';
const persistedEnabled = readPersistedFlag(STORAGE_KEY, false);
const state: BufferState = {
entries: Array.from({ length: DEFAULT_CAPACITY }),
writeIndex: 0,
count: 0,
capacity: DEFAULT_CAPACITY,
enabled: isDev || persistedEnabled,
paused: false,
// Default to 'all' — capture is unconditional anyway; this just makes the
// panel show everything by default rather than only mail-tagged rows.
mode: 'all',
captureBodies: readPersistedFlag(BODIES_STORAGE_KEY, false),
version: 0,
};
const listeners = new Set<() => void>();
export function subscribe(fn: () => void): () => void {
listeners.add(fn);
return () => listeners.delete(fn);
}
function notify() {
state.version++;
for (const fn of listeners) fn();
}
export function getVersion(): number {
return state.version;
}
export function getMode(): CaptureMode {
return state.mode;
}
/**
* `mode` is a view-time filter only — it controls what `TimelineDebuggerTab` renders
* and copies, NOT what the buffer captures. Capture is always unconditional,
* so switching to `all` never has a blind spot for past events.
*/
export function setMode(mode: CaptureMode): void {
if (state.mode === mode) return;
state.mode = mode;
notify();
}
export function isPaused(): boolean {
return state.paused;
}
export function setPaused(p: boolean): void {
state.paused = p;
notify();
}
export function isEnabled(): boolean {
return state.enabled;
}
export function setEnabled(v: boolean): void {
state.enabled = v;
writePersistedFlag(STORAGE_KEY, v);
notify();
}
export function isCaptureBodies(): boolean {
return state.captureBodies;
}
export function setCaptureBodies(v: boolean): void {
state.captureBodies = v;
writePersistedFlag(BODIES_STORAGE_KEY, v);
notify();
}
export function clear(): void {
state.entries = Array.from({ length: state.capacity });
state.writeIndex = 0;
state.count = 0;
notify();
}
export function replaceAll(newEntries: TimelineEntry[]): void {
state.entries = Array.from({ length: state.capacity });
state.writeIndex = 0;
state.count = 0;
for (const e of newEntries.slice(-state.capacity)) {
state.entries[state.writeIndex] = e;
state.writeIndex = (state.writeIndex + 1) % state.capacity;
state.count = Math.min(state.count + 1, state.capacity);
}
notify();
}
let idCounter = 0;
function nextId(): string {
idCounter++;
return `${Date.now().toString(36)}-${idCounter.toString(36)}`;
}
export function isMailTagged(entry: TimelineEntry): boolean {
if (entry.tags?.includes('mail')) return true;
if (entry.source === 'trpc.request' || entry.source === 'trpc.response' || entry.source === 'trpc.error') {
return MAIL_PATH_PREFIXES.some((p) => entry.path.startsWith(p));
}
if (entry.source === 'zustand') {
return entry.changedKeys.some((k) => MAIL_KEYS.has(k));
}
// Errors, freezes, and notes are always interesting in mail mode
if (entry.source === 'error' || entry.source === 'freeze' || entry.source === 'note') return true;
return false;
}
/**
* Patch the most recent tRPC entries (request/response/error) with the server's
* X-Trace-ID and X-Request-ID headers. These are per HTTP batch, not per tRPC op,
* so all entries from a given batch within `withinMs` get the same correlation IDs.
*/
export function attachTraceIdToRecent(
ids: { traceId?: string; serverRequestId?: string },
withinMs = 1500,
): void {
if (!state.enabled) return;
if (!ids.traceId && !ids.serverRequestId) return;
const now = Date.now();
let patched = 0;
for (let i = 0; i < state.capacity && patched < 30; i++) {
const idx = (state.writeIndex - 1 - i + state.capacity * 2) % state.capacity;
const e = state.entries[idx];
if (!e) continue;
if (now - e.ts > withinMs) break;
if (
e.source !== 'trpc.request' &&
e.source !== 'trpc.response' &&
e.source !== 'trpc.error'
) {
continue;
}
let touched = false;
if (ids.traceId && !e.traceId) {
e.traceId = ids.traceId;
touched = true;
}
if (ids.serverRequestId && !e.serverRequestId) {
e.serverRequestId = ids.serverRequestId;
touched = true;
}
if (touched) patched++;
}
if (patched > 0) notify();
}
type PushInput = TimelineEntry extends infer E
? E extends TimelineEntry
? Omit<E, 'id' | 'ts'> & Partial<Pick<E, 'id' | 'ts'>>
: never
: never;
export function push(entryInput: PushInput): string | undefined {
if (!state.enabled || state.paused) return undefined;
// Capture is unconditional — every tRPC op, zustand change, SSE event, etc.
// is stored regardless of `mode`. `mode` filtering happens at render time in
// TimelineDebuggerTab (`isMailTagged`), so it never loses data.
const entry = {
...entryInput,
id: (entryInput as { id?: string }).id ?? nextId(),
ts: (entryInput as { ts?: number }).ts ?? Date.now(),
} as TimelineEntry;
state.entries[state.writeIndex] = entry;
state.writeIndex = (state.writeIndex + 1) % state.capacity;
state.count = Math.min(state.count + 1, state.capacity);
notify();
return entry.id;
}
export function readAll(): TimelineEntry[] {
const out: TimelineEntry[] = [];
if (state.count < state.capacity) {
for (let i = 0; i < state.count; i++) out.push(state.entries[i]!);
} else {
for (let i = 0; i < state.capacity; i++) {
const idx = (state.writeIndex + i) % state.capacity;
const e = state.entries[idx];
if (e) out.push(e);
}
}
return out;
}
export function getCount(): number {
return state.count;
}