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Licensed under the Apache License, Version 2.0.
// Streaming evaluation session over WebSocket (DESIGN 2.5): state machine, reconnect with
// REPLAY, DROP or FAIL buffering, application heartbeat, result timeout and listener guarantees.
import { applyPrecheck, AudioPrecheck, PcmStats, precheckPcmStats } from './audio.js';
import { describeError, InvalidParameterException, isRetryable, localError, YuguError, YuguErrors } from './errors.js';
import { callHook, redactUrl } from './logger.js';
import { computeBackoffDelay } from './retry.js';
import { normalizeEvalResult, normalizePartial } from './result.js';
import { bytesToBase64, randomBytes, toBytes, toHex, truncate, utf8Decode } from './util.js';
/** Session states. */
export const SessionState = Object.freeze({
IDLE: 'IDLE',
CONNECTING: 'CONNECTING',
CONNECTED: 'CONNECTED',
STARTED: 'STARTED',
ENDING: 'ENDING',
RECONNECTING: 'RECONNECTING',
COMPLETED: 'COMPLETED',
FAILED: 'FAILED',
CANCELLED: 'CANCELLED',
CLOSED: 'CLOSED',
});
/** What happens to audio across a reconnect. */
export const AudioBufferPolicy = Object.freeze({ REPLAY: 'REPLAY', DROP: 'DROP', FAIL: 'FAIL' });
/** Heartbeat modes: "auto" pings only once the server is known to answer pong. */
export const HeartbeatMode = Object.freeze({ AUTO: 'auto', ON: true, OFF: false });
/** Replay buffer limit, same as the server per-session audio limit. */
export const DEFAULT_MAX_REPLAY_BYTES = 10 * 1024 * 1024;
/** Largest audio payload per WebSocket frame: 1 s of 16 kHz PCM16, under the 128 KB frame limit. */
const MAX_AUDIO_FRAME_BYTES = 32000;
/**
* maxAttempts counts consecutive failures and resets after a successful reconnect. A server that
* accepts and then always drops the session would loop forever, so a session makes at most
* TOTAL_RECONNECT_FACTOR times maxAttempts reconnect attempts in total.
*/
const TOTAL_RECONNECT_FACTOR = 3;
/** Close codes that a reconnect cannot fix: protocol error, bad data, policy, message too big. */
const TERMINAL_CLOSE_CODES = new Set([1002, 1003, 1007, 1008, 1009, 1010]);
const S = SessionState;
const TERMINAL = new Set([S.COMPLETED, S.FAILED, S.CANCELLED, S.CLOSED]);
const CLOSE_GRACE_MS = 1000;
const WS_CLOSED = 3;
const NOOP = () => {};
const HANDLER = {
connected: 'onConnected',
started: 'onStarted',
partial: 'onPartial',
reconnecting: 'onReconnecting',
reconnected: 'onReconnected',
warning: 'onWarning',
result: 'onResult',
error: 'onError',
closed: 'onClosed',
};
/** Marker that lets only YuguClient construct sessions. */
export const SESSION_CONTEXT = Symbol('yugu.sessionContext');
let sessionSeq = 0;
function neutralize(ws) {
try {
ws.onopen = NOOP;
ws.onmessage = NOOP;
ws.onclose = NOOP;
ws.onerror = NOOP; // never null: the ws package throws on an unhandled error event
} catch (_) {
/* ignore */
}
}
function safeClose(ws, code, reason) {
try {
if (ws.readyState !== WS_CLOSED) ws.close(code, reason);
} catch (_) {
/* already closed or closing */
}
}
/**
* One streaming evaluation. Created by YuguClient.streamEvaluate or streamEvaluateCompat.
*/
export class YuguStreamSession {
constructor(ctx, spec) {
if (!ctx || ctx[SESSION_CONTEXT] !== true) {
throw new TypeError('YuguStreamSession 只能由 YuguClient.streamEvaluate 或 streamEvaluateCompat 创建');
}
sessionSeq += 1;
this._ctx = ctx;
this._id = `ws-${sessionSeq.toString(36)}-${toHex(randomBytes(3))}`;
this._mode = spec.mode;
this._coreType = spec.coreType;
this._path = spec.path;
this._params = spec.params;
this._listener = spec.listener;
this._opt = spec.options;
this._key = spec.options.idempotencyKey;
this._state = S.IDLE;
this._announced = S.IDLE;
this._queue = [];
this._draining = false;
this._ws = null;
this._gen = 0;
this._finalGen = -1;
this._attempt = 0;
this._totalReconnects = 0;
this._connections = 0;
this._reconnectPhase = false;
this._everConnected = false;
this._everStarted = false;
this._endRequested = false;
this._sentOnConn = 0;
this._pingsSent = 0;
this._pingSentAt = null;
this._hbDisabled = false;
this._replay = [];
this._replayBytes = 0;
this._overflow = false;
this._pending = [];
this._acceptedBytes = 0;
this._droppedBytes = 0;
this._droppedSinceLast = 0;
this._stats = new PcmStats();
this._localWarnings = [];
this._warnedLate = false;
// Reading progress last delivered to onPartial, {readUnits, matchedUnits}. Kept across REPLAY
// reconnects; DROP clears it at every successful reconnect (the new server session hears only
// the audio after the reconnect, so its progress starts from zero and need not catch up).
this._lastProgress = null;
this._timers = { connect: null, heartbeat: null, result: null, reconnect: null, close: null };
this._result = null;
this._error = null;
this._closeCode = null;
this._closeReason = '';
this._closedDone = false;
this._waiters = [];
this._closedWaiters = [];
this._abortHandler = null;
}
/** Session id used in logs and EventListener callbacks. */
get id() {
return this._id;
}
/** Idempotency key sent on the handshake and in the start or parameter frame. */
get idempotencyKey() {
return this._key;
}
/** "native" or "compat". */
get mode() {
return this._mode;
}
/** coreType of the session. */
get coreType() {
return this._coreType;
}
/** Current state: always the state announced by the last onStateChanged. */
getState() {
return this._announced;
}
/** True until the session reached COMPLETED, FAILED, CANCELLED or CLOSED. */
isActive() {
return !TERMINAL.has(this._announced);
}
/** Replace or remove (null) the listener. */
setListener(listener) {
if (listener !== null && (typeof listener !== 'object' || listener === undefined)) {
throw localError(90010, 'listener 必须是对象或 null');
}
this._listener = listener;
}
/** Counters for diagnostics. */
getStats() {
return {
state: this._announced,
reconnectAttempts: this._totalReconnects,
acceptedBytes: this._acceptedBytes,
replayBufferBytes: this._replayBytes,
droppedBytes: this._droppedBytes,
replayOverflow: this._overflow,
heartbeat: this._heartbeatWanted(),
};
}
/**
* Queue or send PCM16 mono audio (640 bytes per 20 ms frame recommended).
* Returns true when the bytes are part of the evaluation, false when they were discarded
* (after end, after the session ended, or while reconnecting with DROP).
*/
sendAudio(chunk, options) {
const input = toBytes(chunk);
if (!input) throw localError(90010, 'sendAudio 需要 ArrayBuffer 或 Uint8Array');
if (TERMINAL.has(this._state) || this._state === S.ENDING || this._endRequested) {
if (!this._warnedLate) {
this._warnedLate = true;
this._ctx.logger.warn('ws', `${this._id} end 或结束之后的音频已丢弃`);
}
return false;
}
if (input.length === 0) return true;
const item = { bytes: input.slice(), base64: !!(options && options.base64) };
const len = item.bytes.length;
this._stats.add(item.bytes);
this._acceptedBytes += len;
const policy = this._opt.audioBufferPolicy;
if (this._state === S.STARTED) {
if (policy === AudioBufferPolicy.REPLAY) this._pushReplay(item);
this._sendAudioFrame(item);
return true;
}
if (this._reconnectPhase) {
if (policy === AudioBufferPolicy.REPLAY) {
this._pushReplay(item);
return true;
}
this._droppedBytes += len;
this._droppedSinceLast += len;
return false;
}
if (policy === AudioBufferPolicy.REPLAY) this._pushReplay(item);
else this._pending.push(item);
return true;
}
/**
* Finish the audio. Runs the precheck on the accumulated audio, then sends {"cmd":"end"} as soon
* as the session is STARTED. Idempotent.
*/
end() {
if (TERMINAL.has(this._state) || this._endRequested) return;
this._endRequested = true;
const mode = this._opt.audioPrecheck;
if (mode !== AudioPrecheck.OFF) {
const pc = precheckPcmStats(this._stats, this._opt.sampleRate);
let warnings;
try {
warnings = applyPrecheck(pc.warnings, mode);
} catch (e) {
this._fail(e);
return;
}
this._localWarnings = warnings;
for (const w of warnings) {
this._ctx.logger.warn('precheck', `${this._id} ${w.code} ${w.message}`);
this._emit('warning', w);
}
}
if (this._state === S.STARTED) this._sendEnd();
}
/** Cancel: no onResult or onError follows, onClosed comes last. Idempotent. */
cancel() {
if (TERMINAL.has(this._state)) return;
this._clearTimers();
this._setState(S.CANCELLED);
this._rejectWaiters(localError(90003, '实时评测会话已取消', { idempotencyKey: this._key }));
this._beginClose(1000, 'cancelled');
}
/** Close: cancels an active session, finishes a terminal one at once. Idempotent. */
close() {
if (!TERMINAL.has(this._state)) {
this.cancel();
return;
}
if (!this._closedDone) this._finalize(this._closeCode != null ? this._closeCode : 1000, this._closeReason || 'closed');
}
/** Promise of the final result; rejects with the session error or RequestCancelledException. */
waitForResult() {
if (this._result) return Promise.resolve(this._result);
if (this._error) return Promise.reject(this._error);
if (this._state === S.CANCELLED || (this._state === S.CLOSED && !this._result)) {
return Promise.reject(localError(90003, '实时评测会话已取消', { idempotencyKey: this._key }));
}
return new Promise((resolve, reject) => this._waiters.push({ resolve, reject }));
}
// ------------------------------------------------------------------ internal: lifecycle
_start() {
const sig = this._opt.signal;
if (sig) {
if (sig.aborted) {
Promise.resolve().then(() => this.cancel());
return;
}
this._abortHandler = () => this.cancel();
sig.addEventListener('abort', this._abortHandler, { once: true });
}
Promise.resolve()
.then(() => {
if (this._state === S.IDLE) return this._connect();
return undefined;
})
.catch((e) => this._internalError(e));
}
_whenClosed() {
if (this._closedDone) return Promise.resolve();
return new Promise((resolve) => this._closedWaiters.push(resolve));
}
async _connect() {
if (TERMINAL.has(this._state)) return;
this._timers.reconnect = null;
this._setState(S.CONNECTING);
const gen = ++this._gen;
this._connections += 1;
this._pingsSent = 0;
this._pingSentAt = null;
this._sentOnConn = 0;
this._timers.connect = setTimeout(() => {
this._timers.connect = null;
this._onTransportFailure(gen, localError(90002, `${this._opt.connectTimeoutMs} ms 内未完成连接与会话开始`));
}, this._opt.connectTimeoutMs);
let url;
try {
url = await this._ctx.buildUrl(this._path, this._key, this._opt.query);
} catch (e) {
if (gen === this._gen && !TERMINAL.has(this._state)) this._fail(e instanceof YuguError ? e : localError(90010, String(e && e.message), { cause: e }));
return;
}
if (gen !== this._gen || TERMINAL.has(this._state)) return;
this._ctx.logger.info('ws', `${this._id} connect ${redactUrl(url)}${this._attempt ? ` reconnect ${this._attempt}` : ''}`);
let ws;
try {
ws = new this._ctx.WebSocket(url);
} catch (e) {
this._onTransportFailure(gen, localError(90001, `WebSocket 创建失败：${redactUrl(e && e.message)}`, { cause: e }));
return;
}
this._ws = ws;
try {
ws.binaryType = 'arraybuffer';
} catch (_) {
/* some implementations make it read-only */
}
ws.onopen = () => this._guard(() => {
if (gen === this._gen) this._ctx.logger.debug('ws', `${this._id} socket open`);
});
ws.onmessage = (ev) => this._guard(() => this._onMessage(gen, ev));
ws.onerror = (ev) => this._guard(() => this._onSocketError(gen, ev));
ws.onclose = (ev) => this._guard(() => this._onSocketClose(gen, ev));
}
_guard(fn) {
try {
fn();
} catch (e) {
this._internalError(e);
}
}
_internalError(e) {
this._ctx.logger.error('ws', `${this._id} internal error`, e);
if (!TERMINAL.has(this._state)) this._fail(localError(90005, `SDK 内部错误：${e && e.message}`, { cause: e }));
}
// ------------------------------------------------------------------ internal: frames
_onMessage(gen, ev) {
if (gen !== this._gen || TERMINAL.has(this._state)) return;
this._pingSentAt = null; // any inbound frame proves the connection is alive
const data = ev ? ev.data : undefined;
let text = null;
if (typeof data === 'string') text = data;
else {
const b = toBytes(data);
if (b) {
try {
text = utf8Decode(b);
} catch (_) {
text = null;
}
}
}
if (text == null) {
this._ctx.logger.debug('ws', `${this._id} binary frame ignored`);
return;
}
let f;
try {
f = JSON.parse(text);
} catch (_) {
this._ctx.logger.warn('ws', `${this._id} non JSON frame ignored: ${truncate(text, 120)}`);
return;
}
if (!f || typeof f !== 'object' || Array.isArray(f)) return;
this._handleFrame(gen, f, text);
}
_handleFrame(gen, f, text) {
const ev = typeof f.event === 'string' ? f.event : null;
if (ev === 'pong') {
this._ctx.setPingSupport('supported');
this._updateHeartbeat();
return;
}
if (ev === 'connected') {
this._onConnectedFrame();
return;
}
if (ev === 'started') {
this._onStartedFrame();
return;
}
if (ev === 'error') {
this._onErrorFrame(f);
return;
}
if (ev === 'blocked' || f.blocked === true) {
this._fail(
new InvalidParameterException(typeof f.message === 'string' && f.message ? f.message : '参考文本未通过内容安全审查', {
rawBody: text,
}),
);
return;
}
if (ev === 'result' || Number(f.eof) === 1) {
this._onResultFrame(f);
return;
}
if (f.eof != null && Number(f.eof) === 0) {
this._onPartialFrame(f);
return;
}
this._ctx.logger.debug('ws', `${this._id} frame ignored: ${truncate(text, 120)}`);
}
/**
* Progress frame of either channel, also while ENDING (CONTRACT 5.5). A new server session after
* a reconnect computes the progress again from zero while the audio is replayed, so a partial with
* progress is delivered only when readUnits and matchedUnits are both at least the last delivered
* ones (with DROP the memory starts again at every successful reconnect, see _onStartedFrame).
* Partials without progress are delivered as in 2.0.0.
*/
_onPartialFrame(f) {
const partial = normalizePartial(f);
if (partial.hasProgress) {
const last = this._lastProgress;
if (last && (partial.readUnits < last.readUnits || partial.matchedUnits < last.matchedUnits)) {
this._ctx.logger.debug(
'ws',
`${this._id} progress partial dropped: read ${partial.readUnits} matched ${partial.matchedUnits}` +
` behind delivered read ${last.readUnits} matched ${last.matchedUnits}`,
);
return;
}
this._lastProgress = { readUnits: partial.readUnits, matchedUnits: partial.matchedUnits };
}
this._emit('partial', partial);
}
_onConnectedFrame() {
if (this._state !== S.CONNECTING) return;
this._setState(S.CONNECTED);
if (!this._everConnected) {
this._everConnected = true;
this._emit('connected');
}
const frame = Object.assign({}, this._params);
if (this._mode === 'native') frame.cmd = 'start';
if (this._key) frame.idempotencyKey = this._key;
this._sendJson(frame);
this._updateHeartbeat();
}
_onStartedFrame() {
if (this._state !== S.CONNECTED) return; // duplicate started frames are ignored
this._clearTimer('connect');
this._setState(S.STARTED);
const wasReconnect = this._reconnectPhase;
this._reconnectPhase = false;
if (!this._everStarted) {
this._everStarted = true;
this._emit('started');
}
let replayed = 0;
if (this._opt.audioBufferPolicy === AudioBufferPolicy.REPLAY) {
for (const item of this._replay) {
this._sendAudioFrame(item);
replayed += item.bytes.length;
}
} else {
const pend = this._pending;
this._pending = [];
for (const item of pend) this._sendAudioFrame(item);
}
if (wasReconnect) {
if (this._opt.audioBufferPolicy === AudioBufferPolicy.DROP) this._lastProgress = null;
const info = { droppedBytes: this._droppedSinceLast, replayedBytes: replayed };
this._droppedSinceLast = 0;
this._ctx.logger.info('ws', `${this._id} reconnected after attempt ${this._attempt}, replayed ${replayed} bytes`);
const attempt = this._attempt;
this._attempt = 0; // consecutive failures start again after a successful reconnect
this._emit('reconnected', attempt, info);
callHook(this._ctx.events, 'onReconnect', [this._id, attempt, true], this._ctx.logger);
}
if (this._endRequested && this._state === S.STARTED) this._sendEnd();
else this._updateHeartbeat();
}
_onErrorFrame(f) {
const code = Number(f.code) || 0;
if (code === 0 && f.message === 'unknown cmd') {
// A server without heartbeat support answers {"cmd":"ping"} like this. Never terminal.
if (this._pingsSent > 0) {
this._hbDisabled = true;
this._pingSentAt = null;
this._ctx.setPingSupport('unsupported');
this._ctx.logger.info('ws', `${this._id} server does not support {"cmd":"ping"}; heartbeat off`);
this._updateHeartbeat();
} else {
this._ctx.logger.warn('ws', `${this._id} unexpected "unknown cmd" frame ignored`);
}
return;
}
const err = YuguErrors.fromWsFrame(f, { idempotencyKey: this._key });
if (isRetryable(err)) {
this._ctx.logger.warn('ws', `${this._id} retryable server error: ${describeError(err)} ${err.message}`);
this._retireSocket(1000, 'retryable server error');
this._handleFailure(err);
return;
}
this._fail(err);
}
_onResultFrame(f) {
if (!(this._state === S.CONNECTED || this._state === S.STARTED || this._state === S.ENDING)) return;
this._clearTimers();
const result = normalizeEvalResult(f, {
mode: this._mode,
coreType: this._coreType,
idempotencyKey: this._key,
replayed: f.replayed === true,
localWarnings: this._localWarnings,
});
this._result = result;
this._setState(S.COMPLETED);
this._emit('result', result);
for (const w of this._waiters.splice(0)) w.resolve(result);
this._beginClose(1000, 'completed');
}
_onSocketError(gen, ev) {
if (gen !== this._gen || TERMINAL.has(this._state)) return;
const detail = redactUrl((ev && (ev.message || (ev.error && ev.error.message))) || '');
const m = /Unexpected server response: (\d{3})/.exec(detail);
let err;
if (m) {
const status = Number(m[1]);
err = YuguErrors.fromHttp(status, '', { message: `WebSocket 握手被拒绝，HTTP ${status}`, idempotencyKey: this._key });
} else {
const code = ev && ev.error && (ev.error.code || (ev.error.cause && ev.error.cause.code));
if (code && /CERT|SSL|TLS|SELF_SIGNED/i.test(String(code))) {
err = localError(90011, String(code), { cause: ev.error });
} else {
err = localError(90001, `WebSocket 连接错误${detail ? `：${detail}` : ''}`, { cause: ev && ev.error ? ev.error : undefined });
}
}
this._closeCode = 1006;
this._closeReason = detail;
this._onTransportFailure(gen, err);
}
_onSocketClose(gen, ev) {
const code = ev && typeof ev.code === 'number' ? ev.code : 1006;
let reason = ev && ev.reason != null ? ev.reason : '';
if (typeof reason !== 'string') reason = String(reason);
if (gen === this._finalGen) {
this._finalize(code, reason);
return;
}
if (gen !== this._gen || TERMINAL.has(this._state)) return;
this._closeCode = code;
this._closeReason = reason;
let err;
if (code === 1000) {
err = localError(90005, '服务端正常关闭了连接，但没有返回终评结果');
} else if (TERMINAL_CLOSE_CODES.has(code) || (code >= 4000 && code <= 4999)) {
const why = code === 1009 ? '，单帧超过服务端上限 128 KB' : '';
err = localError(90005, `服务端以 ${code} 关闭连接${why}${reason ? `：${reason}` : ''}`);
} else {
err = localError(90001, `连接异常关闭，code ${code}${reason ? ` ${reason}` : ''}`);
}
err.idempotencyKey = this._key;
this._ws = null;
this._onTransportFailure(gen, err);
}
// ------------------------------------------------------------------ internal: failure and reconnect
_onTransportFailure(gen, err) {
if (gen !== this._gen || TERMINAL.has(this._state)) return;
this._ctx.logger.warn('ws', `${this._id} ${this._state}: ${describeError(err)} ${err.message}`);
this._retireSocket(1000, 'transport failure');
this._handleFailure(err);
}
_retireSocket(code, reason) {
const ws = this._ws;
this._ws = null;
this._gen += 1;
this._clearTimer('connect');
this._clearTimer('result');
this._stopHeartbeat();
if (ws) {
neutralize(ws);
safeClose(ws, code, reason);
}
}
_handleFailure(err) {
if (TERMINAL.has(this._state)) return;
if (!err.idempotencyKey && this._key) err.idempotencyKey = this._key;
const policy = this._opt.reconnect;
const buffer = this._opt.audioBufferPolicy;
if (buffer === AudioBufferPolicy.DROP) {
// DROP keeps nothing: audio the failed connection received and audio still queued is lost.
let lost = this._sentOnConn;
for (const item of this._pending) lost += item.bytes.length;
this._pending = [];
this._droppedSinceLast += lost;
this._droppedBytes += lost;
}
this._sentOnConn = 0;
if (this._reconnectPhase && this._attempt > 0) {
callHook(this._ctx.events, 'onReconnect', [this._id, this._attempt, false], this._ctx.logger);
}
const allowed = policy.enabled && policy.maxAttempts > 0 && buffer !== AudioBufferPolicy.FAIL && this._key != null;
if (!allowed || !isRetryable(err)) {
if (allowed === false && this._key == null && policy.enabled) {
this._ctx.logger.debug('ws', `${this._id} 未带幂等键，不重连`);
}
this._fail(err);
return;
}
if (this._attempt >= policy.maxAttempts || this._totalReconnects >= policy.maxAttempts * TOTAL_RECONNECT_FACTOR) {
this._fail(localError(90006, `连续重连 ${this._attempt} 次，累计重连 ${this._totalReconnects} 次，最后一次原因：${err.message}`, {
cause: err,
attempts: this._connections,
idempotencyKey: this._key,
}));
return;
}
if (buffer === AudioBufferPolicy.REPLAY && this._overflow) {
this._fail(localError(90008, `重放缓冲超过 ${this._opt.maxReplayBytes} 字节`, { cause: err, idempotencyKey: this._key }));
return;
}
this._attempt += 1;
this._totalReconnects += 1;
this._reconnectPhase = true;
const delay = computeBackoffDelay(policy, this._attempt, this._ctx.random);
this._setState(S.RECONNECTING);
this._emit('reconnecting', this._attempt, delay, err);
this._timers.reconnect = setTimeout(() => {
this._timers.reconnect = null;
this._connect().catch((e) => this._internalError(e));
}, delay);
}
_fail(err) {
if (TERMINAL.has(this._state)) return;
this._clearTimers();
if (err instanceof YuguError) {
if (!err.idempotencyKey && this._key) err.idempotencyKey = this._key;
if (!err.attempts) err.attempts = Math.max(1, this._connections);
}
this._error = err;
this._setState(S.FAILED);
this._emit('error', err);
this._rejectWaiters(err);
this._beginClose(1000, 'failed');
}
_rejectWaiters(err) {
for (const w of this._waiters.splice(0)) w.reject(err);
}
_beginClose(code, reason) {
const ws = this._ws;
if (!ws || ws.readyState === WS_CLOSED) {
this._ws = null;
this._finalize(this._closeCode != null ? this._closeCode : code, this._closeReason || reason);
return;
}
this._finalGen = this._gen;
const gen = this._gen;
try {
ws.onmessage = NOOP;
ws.onerror = NOOP;
ws.onclose = (ev) => this._guard(() => this._onSocketClose(gen, ev));
} catch (_) {
/* ignore */
}
safeClose(ws, code, reason);
this._timers.close = setTimeout(() => {
this._timers.close = null;
this._finalize(code, reason);
}, CLOSE_GRACE_MS);
}
_finalize(code, reason) {
if (this._closedDone) return;
this._closedDone = true;
this._clearTimers();
this._clearTimer('close');
if (this._ws) {
neutralize(this._ws);
safeClose(this._ws, 1000, 'closed');
this._ws = null;
}
this._finalGen = -1;
if (this._opt.signal && this._abortHandler) {
try {
this._opt.signal.removeEventListener('abort', this._abortHandler);
} catch (_) {
/* ignore */
}
}
this._replay = [];
this._pending = [];
this._setState(S.CLOSED);
this._emit('closed', code, reason || '');
this._ctx.unregister(this);
for (const w of this._closedWaiters.splice(0)) w();
}
// ------------------------------------------------------------------ internal: sending
_pushReplay(item) {
if (this._overflow) return;
if (this._replayBytes + item.bytes.length > this._opt.maxReplayBytes) {
this._overflow = true;
this._ctx.logger.warn('ws', `${this._id} replay buffer exceeds ${this._opt.maxReplayBytes} bytes; the next reconnect fails with 90008`);
return;
}
this._replay.push(item);
this._replayBytes += item.bytes.length;
}
_sendAudioFrame(item) {
if (!this._ws) return;
const gen = this._gen;
try {
const b = item.bytes;
for (let off = 0; off < b.length; off += MAX_AUDIO_FRAME_BYTES) {
const part = b.length <= MAX_AUDIO_FRAME_BYTES ? b : b.subarray(off, off + MAX_AUDIO_FRAME_BYTES);
if (item.base64) this._ws.send(JSON.stringify({ cmd: 'audio', data: bytesToBase64(part) }));
else this._ws.send(part);
this._sentOnConn += part.length;
}
} catch (e) {
this._onTransportFailure(gen, localError(90001, `发送音频失败：${e && e.message}`, { cause: e }));
}
}
_sendJson(obj) {
if (!this._ws) return;
try {
this._ws.send(JSON.stringify(obj));
} catch (e) {
this._onTransportFailure(this._gen, localError(90001, `发送帧失败：${e && e.message}`, { cause: e }));
}
}
_sendEnd() {
const gen = this._gen;
this._sendJson({ cmd: 'end' });
if (gen !== this._gen || this._state !== S.STARTED) return;
this._setState(S.ENDING);
this._stopHeartbeat();
this._timers.result = setTimeout(() => {
this._timers.result = null;
this._onTransportFailure(gen, localError(90007, `end 之后 ${this._opt.resultTimeoutMs} ms 未收到终评结果`));
}, this._opt.resultTimeoutMs);
}
// ------------------------------------------------------------------ internal: heartbeat
_heartbeatWanted() {
if (!(this._state === S.CONNECTED || this._state === S.STARTED)) return false;
if (this._hbDisabled) return false;
const mode = this._opt.heartbeat;
if (mode === false) return false;
if (mode === true) return true;
const support = this._ctx.getPingSupport();
if (support === 'supported') return true;
if (support === 'unsupported') return false;
// Unknown: probe only on native sessions in STARTED. A native server without ping support
// answers "unknown cmd" and goes on; a compat server would take the ping as a parameter frame.
return this._mode === 'native' && this._state === S.STARTED;
}
_updateHeartbeat() {
const want = this._heartbeatWanted();
if (want && !this._timers.heartbeat) {
const gen = this._gen;
this._pingSentAt = null;
this._timers.heartbeat = setInterval(() => this._guard(() => this._heartbeatTick(gen)), this._opt.heartbeatIntervalMs);
} else if (!want) {
this._stopHeartbeat();
}
}
_stopHeartbeat() {
if (this._timers.heartbeat) {
clearInterval(this._timers.heartbeat);
this._timers.heartbeat = null;
}
this._pingSentAt = null;
}
_heartbeatTick(gen) {
if (gen !== this._gen || !this._heartbeatWanted()) {
this._stopHeartbeat();
return;
}
const now = Date.now();
if (this._pingSentAt != null && now - this._pingSentAt >= this._opt.heartbeatTimeoutMs) {
this._onTransportFailure(gen, localError(90002, `心跳 ${this._opt.heartbeatTimeoutMs} ms 内没有应答`));
return;
}
this._sendJson({ cmd: 'ping' });
this._pingsSent += 1;
if (this._pingSentAt == null) this._pingSentAt = now;
}
// ------------------------------------------------------------------ internal: state and events
_setState(next) {
const prev = this._state;
if (prev === next) return;
this._state = next;
this._ctx.logger.debug('ws', `${this._id} ${prev} -> ${next}`);
this._emit('stateChanged', prev, next);
}
_emit(kind, ...args) {
this._queue.push([kind, args]);
if (this._draining) return;
this._draining = true;
try {
while (this._queue.length) {
const [k, a] = this._queue.shift();
this._deliver(k, a);
}
} finally {
this._draining = false;
}
}
_deliver(kind, args) {
if (kind === 'stateChanged') {
this._announced = args[1];
this._call('onStateChanged', args);
callHook(this._ctx.events, 'onSessionStateChanged', [this._id, args[0], args[1]], this._ctx.logger);
return;
}
this._call(HANDLER[kind], args);
}
_call(name, args) {
const l = this._listener;
if (!l) return;
const fn = l[name];
if (typeof fn !== 'function') return;
try {
fn.apply(l, args);
} catch (e) {
this._ctx.logger.error('ws', `${this._id} listener.${name} threw`, e);
}
}
_clearTimer(name) {
const t = this._timers[name];
if (t) {
if (name === 'heartbeat') clearInterval(t);
else clearTimeout(t);
this._timers[name] = null;
}
}
_clearTimers() {
this._clearTimer('connect');
this._clearTimer('result');
this._clearTimer('reconnect');
this._stopHeartbeat();
}
}
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