1 | ;
|
2 | Object.defineProperty(exports, "__esModule", { value: true });
|
3 | exports.faastLocal = exports.faastGoogle = exports.faastAws = exports.faast = exports.FaastModuleProxy = exports.FunctionStatsEvent = exports.providers = void 0;
|
4 | const events_1 = require("events");
|
5 | const util_1 = require("util");
|
6 | const uuid_1 = require("uuid");
|
7 | const aws_faast_1 = require("./aws/aws-faast");
|
8 | const cost_1 = require("./cost");
|
9 | const error_1 = require("./error");
|
10 | const google_faast_1 = require("./google/google-faast");
|
11 | const local_faast_1 = require("./local/local-faast");
|
12 | const log_1 = require("./log");
|
13 | const metrics_1 = require("./metrics");
|
14 | const provider_1 = require("./provider");
|
15 | const serialize_1 = require("./serialize");
|
16 | const shared_1 = require("./shared");
|
17 | const throttle_1 = require("./throttle");
|
18 | const wrapper_1 = require("./wrapper");
|
19 | const Module = require("module");
|
20 | /**
|
21 | * An array of all available provider.
|
22 | * @public
|
23 | */
|
24 | exports.providers = ["aws", "google", "local"];
|
25 | async function createFaastModuleProxy(impl, fmodule, userOptions) {
|
26 | try {
|
27 | const resolvedModule = resolve(fmodule);
|
28 | const functionId = (0, uuid_1.v4)();
|
29 | const options = { ...impl.defaults, ...userOptions };
|
30 | log_1.log.provider(`options ${(0, log_1.inspectProvider)(options)}`);
|
31 | return new FaastModuleProxy(impl, await impl.initialize(resolvedModule, functionId, options), fmodule, resolvedModule, options);
|
32 | }
|
33 | catch (err) {
|
34 | throw new error_1.FaastError(err, "could not initialize cloud function");
|
35 | }
|
36 | }
|
37 | /**
|
38 | * Summarize statistics about cloud function invocations.
|
39 | * @public
|
40 | */
|
41 | class FunctionStatsEvent {
|
42 | /**
|
43 | * @internal
|
44 | */
|
45 | constructor(
|
46 | /** The name of the cloud function the statistics are about. */
|
47 | fn,
|
48 | /** See {@link FunctionStats}. */
|
49 | stats) {
|
50 | this.fn = fn;
|
51 | this.stats = stats;
|
52 | this.stats = stats.clone();
|
53 | }
|
54 | /**
|
55 | * Returns a string summarizing the statistics event.
|
56 | * @remarks
|
57 | * The string includes number of completed calls, errors, and retries, and
|
58 | * the mean execution time for the calls that completed within the last time
|
59 | * interval (1s).
|
60 | */
|
61 | toString() {
|
62 | const executionTime = this.stats ? this.stats.executionTime.mean : 0;
|
63 | return `[${this.fn}] ${this.stats}, executionTime: ${(executionTime / 1000).toFixed(2)}s`;
|
64 | }
|
65 | }
|
66 | exports.FunctionStatsEvent = FunctionStatsEvent;
|
67 | class PendingRequest {
|
68 | constructor(call) {
|
69 | this.call = call;
|
70 | this.queue = new throttle_1.AsyncOrderedQueue();
|
71 | this.created = Date.now();
|
72 | }
|
73 | }
|
74 | /**
|
75 | * Implementation of {@link FaastModule}.
|
76 | * @remarks
|
77 | * `FaastModuleProxy` provides a unified developer experience for faast.js
|
78 | * modules on top of provider-specific runtime APIs. Most users will not create
|
79 | * `FaastModuleProxy` instances themselves; instead use {@link faast}, or
|
80 | * {@link faastAws}, {@link faastGoogle}, or {@link faastLocal}.
|
81 | * `FaastModuleProxy` implements the {@link FaastModule} interface, which is the
|
82 | * preferred public interface for faast modules. `FaastModuleProxy` can be used
|
83 | * to access provider-specific details and state, and is useful for deeper
|
84 | * testing.
|
85 | * @public
|
86 | */
|
87 | class FaastModuleProxy {
|
88 | /**
|
89 | * Constructor
|
90 | * @internal
|
91 | */
|
92 | constructor(impl,
|
93 | /** @internal */
|
94 | state, fmodule, modulePath,
|
95 | /** The options set for this instance, which includes default values. */
|
96 | options) {
|
97 | this.impl = impl;
|
98 | this.state = state;
|
99 | this.fmodule = fmodule;
|
100 | this.modulePath = modulePath;
|
101 | this.options = options;
|
102 | /** The {@link Provider}, e.g. "aws" or "google". */
|
103 | this.provider = this.impl.name;
|
104 | /** @internal */
|
105 | this._stats = new metrics_1.FunctionStatsMap();
|
106 | this._cpuUsage = new metrics_1.FactoryMap(() => new metrics_1.FactoryMap((_) => new metrics_1.FunctionCpuUsage()));
|
107 | this._skew = new shared_1.ExponentiallyDecayingAverageValue(0.3);
|
108 | this._cleanupHooks = new Set();
|
109 | this._initialInvocationTime = new metrics_1.FactoryMap(() => Date.now());
|
110 | this._callResultsPending = new Map();
|
111 | this._emitter = new events_1.EventEmitter();
|
112 | log_1.log.info(`Node version: ${process.version}`);
|
113 | log_1.log.provider(`name: ${this.impl.name}`);
|
114 | log_1.log.provider(`responseQueueId: ${this.impl.responseQueueId(state)}`);
|
115 | log_1.log.provider(`logUrl: ${this.impl.logUrl(state)}`);
|
116 | log_1.log.info(`Log url: ${impl.logUrl(state)}`);
|
117 | this._funnel = new throttle_1.Funnel(options.concurrency);
|
118 | if (options.rate) {
|
119 | this._rateLimiter = new throttle_1.RateLimiter(options.rate, 1);
|
120 | }
|
121 | this._memoryLeakDetector = new metrics_1.MemoryLeakDetector(options.memorySize);
|
122 | const functionsDetail = {};
|
123 | const functions = {};
|
124 | for (const name of Object.keys(fmodule)) {
|
125 | const origFunction = fmodule[name];
|
126 | if (typeof origFunction === "function") {
|
127 | if ((0, wrapper_1.isGenerator)(origFunction)) {
|
128 | const func = this.wrapGenerator(origFunction);
|
129 | functionsDetail[name] = func;
|
130 | functions[name] = async function* (...args) {
|
131 | const generator = func(...args);
|
132 | for await (const iter of generator) {
|
133 | yield iter.value;
|
134 | }
|
135 | };
|
136 | }
|
137 | else {
|
138 | const func = this.wrapFunction(origFunction);
|
139 | functionsDetail[name] = func;
|
140 | functions[name] = (...args) => func(...args).then(p => p.value);
|
141 | }
|
142 | }
|
143 | }
|
144 | this.functions = functions;
|
145 | this.functionsDetail = functionsDetail;
|
146 | this._collectorPump = new throttle_1.Pump({ concurrency: 2 }, () => this.resultCollector());
|
147 | this._collectorPump.start();
|
148 | }
|
149 | /** {@inheritdoc FaastModule.cleanup} */
|
150 | async cleanup(userCleanupOptions = {}) {
|
151 | try {
|
152 | this._stats.clear();
|
153 | this._memoryLeakDetector.clear();
|
154 | this._funnel.clear();
|
155 | this._rateLimiter?.clear();
|
156 | this._cleanupHooks.forEach(hook => hook.resolve());
|
157 | this._cleanupHooks.clear();
|
158 | this._emitter.removeAllListeners();
|
159 | this.stopStats();
|
160 | this._initialInvocationTime.clear();
|
161 | this._callResultsPending.clear();
|
162 | this._collectorPump.stop();
|
163 | log_1.log.provider(`cleanup`);
|
164 | const options = { ...provider_1.CleanupOptionDefaults, ...userCleanupOptions };
|
165 | const { gcTimeout } = options;
|
166 | let timedout = false;
|
167 | if (gcTimeout > 0) {
|
168 | const timeout = (0, shared_1.sleep)(gcTimeout * 1000).then(() => (timedout = true));
|
169 | await Promise.race([this.impl.cleanup(this.state, options), timeout]);
|
170 | }
|
171 | else {
|
172 | await this.impl.cleanup(this.state, options);
|
173 | }
|
174 | if (timedout) {
|
175 | log_1.log.provider(`cleanup timed out after ${gcTimeout}s`);
|
176 | }
|
177 | else {
|
178 | log_1.log.provider(`cleanup done`);
|
179 | }
|
180 | }
|
181 | catch (err) {
|
182 | throw new error_1.FaastError(err, "failed in cleanup");
|
183 | }
|
184 | }
|
185 | /** {@inheritdoc FaastModule.logUrl} */
|
186 | logUrl() {
|
187 | const rv = this.impl.logUrl(this.state);
|
188 | log_1.log.provider(`logUrl ${rv}`);
|
189 | return rv;
|
190 | }
|
191 | startStats(interval = 1000) {
|
192 | this._statsTimer = setInterval(() => {
|
193 | this._stats.fIncremental.forEach((stats, fn) => {
|
194 | this._emitter.emit("stats", new FunctionStatsEvent(fn, stats));
|
195 | });
|
196 | this._stats.resetIncremental();
|
197 | }, interval);
|
198 | }
|
199 | stopStats() {
|
200 | this._statsTimer && clearInterval(this._statsTimer);
|
201 | this._statsTimer = undefined;
|
202 | }
|
203 | /** {@inheritdoc FaastModule.on} */
|
204 | on(name, listener) {
|
205 | if (!this._statsTimer) {
|
206 | this.startStats();
|
207 | }
|
208 | this._emitter.on(name, listener);
|
209 | }
|
210 | /** {@inheritdoc FaastModule.off} */
|
211 | off(name, listener) {
|
212 | this._emitter.off(name, listener);
|
213 | if (this._emitter.listenerCount(name) === 0) {
|
214 | this.stopStats();
|
215 | }
|
216 | }
|
217 | async withCancellation(fn) {
|
218 | const deferred = new throttle_1.Deferred();
|
219 | this._cleanupHooks.add(deferred);
|
220 | const promise = fn(deferred.promise);
|
221 | try {
|
222 | return await promise;
|
223 | }
|
224 | finally {
|
225 | this._cleanupHooks.delete(deferred);
|
226 | }
|
227 | }
|
228 | processResponse(returned, functionName, localStartTime) {
|
229 | const { response } = returned;
|
230 | const { logUrl, instanceId, memoryUsage } = response;
|
231 | let value;
|
232 | if (response.type === "reject") {
|
233 | const error = response.isErrorObject
|
234 | ? (0, error_1.synthesizeFaastError)({
|
235 | errObj: returned.value,
|
236 | logUrl: ` ${logUrl} `,
|
237 | functionName
|
238 | })
|
239 | : returned.value;
|
240 | value = Promise.reject(error);
|
241 | value.catch((_silenceWarningLackOfSynchronousCatch) => { });
|
242 | }
|
243 | else {
|
244 | const { executionId } = returned.response;
|
245 | const detail = {
|
246 | value: returned.value[0],
|
247 | logUrl,
|
248 | executionId,
|
249 | instanceId,
|
250 | memoryUsage
|
251 | };
|
252 | value = Promise.resolve(detail);
|
253 | }
|
254 | const { localRequestSentTime, remoteResponseSentTime, localEndTime } = returned;
|
255 | const { remoteExecutionStartTime, remoteExecutionEndTime } = response;
|
256 | const fstats = this._stats;
|
257 | if (remoteExecutionStartTime && remoteExecutionEndTime) {
|
258 | const localStartLatency = localRequestSentTime - localStartTime;
|
259 | const roundTripLatency = localEndTime - localRequestSentTime;
|
260 | const executionTime = remoteExecutionEndTime - remoteExecutionStartTime;
|
261 | const sendResponseLatency = Math.max(0, (remoteResponseSentTime || remoteExecutionEndTime) -
|
262 | remoteExecutionEndTime);
|
263 | const networkLatency = roundTripLatency - executionTime - sendResponseLatency;
|
264 | const estimatedRemoteStartTime = localRequestSentTime + networkLatency / 2;
|
265 | const estimatedSkew = estimatedRemoteStartTime - remoteExecutionStartTime;
|
266 | let skew = estimatedSkew;
|
267 | if (fstats.aggregate.completed > 1) {
|
268 | this._skew.update(skew);
|
269 | skew = this._skew.value;
|
270 | }
|
271 | const remoteStartLatency = Math.max(1, remoteExecutionStartTime + skew - localRequestSentTime);
|
272 | const returnLatency = Math.max(1, localEndTime - (remoteExecutionEndTime + skew));
|
273 | fstats.update(functionName, "localStartLatency", localStartLatency);
|
274 | fstats.update(functionName, "remoteStartLatency", remoteStartLatency);
|
275 | fstats.update(functionName, "executionTime", executionTime);
|
276 | fstats.update(functionName, "sendResponseLatency", sendResponseLatency);
|
277 | fstats.update(functionName, "returnLatency", returnLatency);
|
278 | const billed = (executionTime || 0) + (sendResponseLatency || 0);
|
279 | const estimatedBilledTime = Math.max(100, Math.ceil(billed / 100) * 100);
|
280 | fstats.update(functionName, "estimatedBilledTime", estimatedBilledTime);
|
281 | }
|
282 | if (response.type === "reject") {
|
283 | fstats.incr(functionName, "errors");
|
284 | }
|
285 | else {
|
286 | fstats.incr(functionName, "completed");
|
287 | }
|
288 | if (instanceId && memoryUsage) {
|
289 | if (this._memoryLeakDetector.detectedNewLeak(functionName, instanceId, memoryUsage)) {
|
290 | log_1.log.leaks(`Possible memory leak detected in function '${functionName}'.`);
|
291 | log_1.log.leaks(`Memory use before execution leaked from prior calls: %O`, memoryUsage);
|
292 | log_1.log.leaks(`Logs: ${logUrl} `);
|
293 | log_1.log.leaks(`These logs show only one example faast cloud function invocation that may have a leak.`);
|
294 | }
|
295 | }
|
296 | return value;
|
297 | }
|
298 | invoke(fname, args, callId) {
|
299 | const ResponseQueueId = this.impl.responseQueueId(this.state);
|
300 | const callObject = {
|
301 | name: fname,
|
302 | args: (0, serialize_1.serializeFunctionArgs)(fname, args, this.options.validateSerialization),
|
303 | callId,
|
304 | modulePath: this.modulePath,
|
305 | ResponseQueueId
|
306 | };
|
307 | log_1.log.calls(`Calling '${fname}' (${callId})`);
|
308 | const pending = new PendingRequest(callObject);
|
309 | this._callResultsPending.set(callId, pending);
|
310 | if (this._collectorPump.stopped) {
|
311 | this._collectorPump.start();
|
312 | }
|
313 | this.withCancellation(async (cancel) => {
|
314 | await this.impl.invoke(this.state, pending.call, cancel).catch(err => pending.queue.pushImmediate({
|
315 | response: {
|
316 | kind: "promise",
|
317 | type: "reject",
|
318 | callId,
|
319 | isErrorObject: typeof err === "object" && err instanceof Error,
|
320 | value: (0, serialize_1.serialize)(err)
|
321 | },
|
322 | value: err,
|
323 | localEndTime: Date.now(),
|
324 | localRequestSentTime: pending.created
|
325 | }));
|
326 | });
|
327 | return pending;
|
328 | }
|
329 | lookupFname(fn) {
|
330 | let fname = fn.name;
|
331 | if (!fname) {
|
332 | for (const key of Object.keys(this.fmodule)) {
|
333 | if (this.fmodule[key] === fn) {
|
334 | fname = key;
|
335 | log_1.log.info(`Found arrow function name: ${key}`);
|
336 | break;
|
337 | }
|
338 | }
|
339 | }
|
340 | if (!fname) {
|
341 | throw new error_1.FaastError(`Could not find function name`);
|
342 | }
|
343 | return fname;
|
344 | }
|
345 | createCallId() {
|
346 | return (0, uuid_1.v4)();
|
347 | }
|
348 | wrapGenerator(fn) {
|
349 | return (...args) => {
|
350 | const startTime = Date.now();
|
351 | let fname = this.lookupFname(fn);
|
352 | const callId = this.createCallId();
|
353 | const pending = this.invoke(fname, args, callId);
|
354 | log_1.log.provider(`invoke ${(0, log_1.inspectProvider)(pending.call)}`);
|
355 | this._stats.incr(fname, "invocations");
|
356 | return {
|
357 | [Symbol.asyncIterator]() {
|
358 | return this;
|
359 | },
|
360 | next: () => pending.queue.next().then(async (next) => {
|
361 | const promise = this.processResponse(next, fname, startTime);
|
362 | const result = await promise;
|
363 | log_1.log.calls(`yielded ${(0, util_1.inspect)(result)}`);
|
364 | const { value, ...rest } = result;
|
365 | if (result.value.done) {
|
366 | this.clearPending(callId);
|
367 | return { done: true, value: rest };
|
368 | }
|
369 | else {
|
370 | return {
|
371 | done: false,
|
372 | value: { ...rest, value: value.value }
|
373 | };
|
374 | }
|
375 | })
|
376 | };
|
377 | };
|
378 | }
|
379 | clearPending(callId) {
|
380 | this._callResultsPending.delete(callId);
|
381 | if (this._callResultsPending.size === 0) {
|
382 | this._collectorPump.stop();
|
383 | }
|
384 | }
|
385 | wrapFunction(fn) {
|
386 | return (...args) => {
|
387 | const startTime = Date.now();
|
388 | let fname = this.lookupFname(fn);
|
389 | const callId = this.createCallId();
|
390 | const tryInvoke = async () => {
|
391 | const pending = this.invoke(fname, args, callId);
|
392 | log_1.log.provider(`invoke ${(0, log_1.inspectProvider)(pending.call)}`);
|
393 | this._stats.incr(fname, "invocations");
|
394 | const responsePromise = pending.queue.next();
|
395 | const rv = await responsePromise;
|
396 | this.clearPending(callId);
|
397 | log_1.log.calls(`Returning '${fname}' (${callId}): ${(0, util_1.inspect)(rv)}`);
|
398 | return this.processResponse(rv, fname, startTime);
|
399 | };
|
400 | const funnel = this._funnel;
|
401 | let retries = 0;
|
402 | const shouldRetry = (err) => {
|
403 | if (err instanceof error_1.FaastError) {
|
404 | if (error_1.FaastError.hasCauseWithName(err, error_1.FaastErrorNames.ESERIALIZE)) {
|
405 | return false;
|
406 | }
|
407 | // Don't retry user-generated errors. Only errors caused by
|
408 | // failures of operations faast itself initiated (e.g. cloud
|
409 | // service APIs) are retried.
|
410 | if (error_1.FaastError.hasCauseWithName(err, error_1.FaastErrorNames.EEXCEPTION)) {
|
411 | return false;
|
412 | }
|
413 | }
|
414 | if (retries < this.options.maxRetries) {
|
415 | retries++;
|
416 | this._stats.incr(fname, "retries");
|
417 | log_1.log.info(`faast: func: ${fname} attempts: ${retries}, err: ${(0, log_1.inspectProvider)(err)}`);
|
418 | return true;
|
419 | }
|
420 | return false;
|
421 | };
|
422 | if (this._rateLimiter) {
|
423 | return funnel.push(() => this._rateLimiter.push(tryInvoke), shouldRetry);
|
424 | }
|
425 | else {
|
426 | return funnel.push(tryInvoke, shouldRetry);
|
427 | }
|
428 | };
|
429 | }
|
430 | /** {@inheritdoc FaastModule.costSnapshot} */
|
431 | async costSnapshot() {
|
432 | const estimate = await this.impl.costSnapshot(this.state, this._stats.aggregate);
|
433 | log_1.log.provider(`costSnapshot returned ${(0, log_1.inspectProvider)(estimate)}`);
|
434 | if (this._stats.aggregate.retries > 0) {
|
435 | const { retries, invocations } = this._stats.aggregate;
|
436 | const retryPct = ((retries / invocations) * 100).toFixed(1);
|
437 | estimate.push(new cost_1.CostMetric({
|
438 | name: "retries",
|
439 | pricing: 0,
|
440 | measured: retries,
|
441 | unit: "retry",
|
442 | unitPlural: "retries",
|
443 | comment: `Retries were ${retryPct}% of requests and may have incurred charges not accounted for by faast.`,
|
444 | informationalOnly: true
|
445 | }));
|
446 | }
|
447 | return estimate;
|
448 | }
|
449 | /** {@inheritdoc FaastModule.stats} */
|
450 | stats(functionName) {
|
451 | if (functionName) {
|
452 | return this._stats.fAggregate.getOrCreate(functionName).clone();
|
453 | }
|
454 | return this._stats.aggregate.clone();
|
455 | }
|
456 | async resultCollector() {
|
457 | const { _callResultsPending: callResultsPending } = this;
|
458 | if (!callResultsPending.size) {
|
459 | return;
|
460 | }
|
461 | log_1.log.provider(`polling ${this.impl.responseQueueId(this.state)}`);
|
462 | const pollResult = await this.withCancellation(cancel => this.impl.poll(this.state, cancel));
|
463 | log_1.log.provider(`poll returned ${(0, log_1.inspectProvider)(pollResult)}`);
|
464 | const { Messages, isFullMessageBatch } = pollResult;
|
465 | const localEndTime = Date.now();
|
466 | this.adjustCollectorConcurrencyLevel(isFullMessageBatch);
|
467 | for (const m of Messages) {
|
468 | switch (m.kind) {
|
469 | case "functionstarted": {
|
470 | const pending = callResultsPending.get(m.callId);
|
471 | if (pending) {
|
472 | pending.executing = true;
|
473 | }
|
474 | break;
|
475 | }
|
476 | case "promise":
|
477 | case "iterator":
|
478 | try {
|
479 | const { timestamp } = m;
|
480 | const value = (0, serialize_1.deserialize)(m.value);
|
481 | const pending = callResultsPending.get(m.callId);
|
482 | if (pending) {
|
483 | const rv = {
|
484 | response: m,
|
485 | value,
|
486 | remoteResponseSentTime: timestamp,
|
487 | localRequestSentTime: pending.created,
|
488 | localEndTime
|
489 | };
|
490 | log_1.log.provider(`returned ${(0, log_1.inspectProvider)(value)}`);
|
491 | if (m.kind === "iterator") {
|
492 | pending.queue.push(rv, m.sequence);
|
493 | }
|
494 | else {
|
495 | pending.queue.pushImmediate(rv);
|
496 | }
|
497 | }
|
498 | else {
|
499 | log_1.log.info(`Pending promise not found for CallId: ${m.callId}`);
|
500 | }
|
501 | }
|
502 | catch (err) {
|
503 | log_1.log.warn(err);
|
504 | }
|
505 | break;
|
506 | case "cpumetrics":
|
507 | const { metrics } = m;
|
508 | const pending = callResultsPending.get(m.callId);
|
509 | if (!pending) {
|
510 | return;
|
511 | }
|
512 | const stats = this._cpuUsage.getOrCreate(pending.call.name);
|
513 | const secondMetrics = stats.getOrCreate(Math.round(metrics.elapsed / 1000));
|
514 | secondMetrics.stime.update(metrics.stime);
|
515 | secondMetrics.utime.update(metrics.utime);
|
516 | secondMetrics.cpuTime.update(metrics.stime + metrics.utime);
|
517 | break;
|
518 | }
|
519 | }
|
520 | }
|
521 | adjustCollectorConcurrencyLevel(full) {
|
522 | const nPending = this._callResultsPending.size;
|
523 | if (nPending > 0) {
|
524 | let nCollectors = full ? Math.floor(nPending / 20) + 2 : 2;
|
525 | nCollectors = Math.min(nCollectors, 10);
|
526 | const pump = this._collectorPump;
|
527 | const previous = pump.concurrency;
|
528 | pump.setMaxConcurrency(nCollectors);
|
529 | if (previous !== pump.concurrency) {
|
530 | log_1.log.info(`Result collectors running: ${pump.getConcurrency()}, new max: ${pump.concurrency}`);
|
531 | }
|
532 | }
|
533 | }
|
534 | }
|
535 | exports.FaastModuleProxy = FaastModuleProxy;
|
536 | function resolve(fmodule) {
|
537 | const cache = Module._cache;
|
538 | let modulePath;
|
539 | for (const key of Object.keys(cache).reverse()) {
|
540 | if (cache[key].exports === fmodule) {
|
541 | modulePath = key;
|
542 | break;
|
543 | }
|
544 | }
|
545 | if (!modulePath) {
|
546 | throw new error_1.FaastError({ info: { module: fmodule } }, `Could not find file for module, must use "import * as X from Y" or "X = require(Y)" to load a module for faast.`);
|
547 | }
|
548 | log_1.log.info(`Found file: ${modulePath}`);
|
549 | return modulePath;
|
550 | }
|
551 | /**
|
552 | * The main entry point for faast with any provider and only common options.
|
553 | * @param provider - One of `"aws"`, `"google"`, or `"local"`. See
|
554 | * {@link Provider}.
|
555 | * @param fmodule - A module imported with `import * as X from "Y";`. Using
|
556 | * `require` also works but loses type information.
|
557 | * @param options - See {@link CommonOptions}.
|
558 | * @returns See {@link FaastModule}.
|
559 | * @remarks
|
560 | * Example of usage:
|
561 | * ```typescript
|
562 | * import { faast } from "faastjs";
|
563 | * import * as mod from "./path/to/module";
|
564 | * (async () => {
|
565 | * const faastModule = await faast("aws", mod);
|
566 | * try {
|
567 | * const result = await faastModule.functions.func("arg");
|
568 | * } finally {
|
569 | * await faastModule.cleanup();
|
570 | * }
|
571 | * })();
|
572 | * ```
|
573 | * @public
|
574 | */
|
575 | async function faast(provider, fmodule, options) {
|
576 | switch (provider) {
|
577 | case "aws":
|
578 | return faastAws(fmodule, options);
|
579 | case "google":
|
580 | return faastGoogle(fmodule, options);
|
581 | case "local":
|
582 | return faastLocal(fmodule, options);
|
583 | default:
|
584 | throw new error_1.FaastError(`Unknown cloud provider option '${provider}'`);
|
585 | }
|
586 | }
|
587 | exports.faast = faast;
|
588 | /**
|
589 | * The main entry point for faast with AWS provider.
|
590 | * @param fmodule - A module imported with `import * as X from "Y";`. Using
|
591 | * `require` also works but loses type information.
|
592 | * @param options - Most common options are in {@link CommonOptions}.
|
593 | * Additional AWS-specific options are in {@link AwsOptions}.
|
594 | * @public
|
595 | */
|
596 | function faastAws(fmodule, options) {
|
597 | return createFaastModuleProxy(aws_faast_1.AwsImpl, fmodule, options);
|
598 | }
|
599 | exports.faastAws = faastAws;
|
600 | /**
|
601 | * The main entry point for faast with Google provider.
|
602 | * @param fmodule - A module imported with `import * as X from "Y";`. Using
|
603 | * `require` also works but loses type information.
|
604 | * @param options - Most common options are in {@link CommonOptions}.
|
605 | * Additional Google-specific options are in {@link GoogleOptions}.
|
606 | * @public
|
607 | */
|
608 | function faastGoogle(fmodule, options) {
|
609 | return createFaastModuleProxy(google_faast_1.GoogleImpl, fmodule, options);
|
610 | }
|
611 | exports.faastGoogle = faastGoogle;
|
612 | /**
|
613 | * The main entry point for faast with Local provider.
|
614 | * @param fmodule - A module imported with `import * as X from "Y";`. Using
|
615 | * `require` also works but loses type information.
|
616 | * @param options - Most common options are in {@link CommonOptions}.
|
617 | * Additional Local-specific options are in {@link LocalOptions}.
|
618 | * @returns a Promise for {@link LocalFaastModule}.
|
619 | * @public
|
620 | */
|
621 | function faastLocal(fmodule, options) {
|
622 | return createFaastModuleProxy(local_faast_1.LocalImpl, fmodule, options);
|
623 | }
|
624 | exports.faastLocal = faastLocal;
|
625 | function estimateFunctionLatency(fnStats) {
|
626 | const { executionTime, localStartLatency, remoteStartLatency, returnLatency } = fnStats;
|
627 | return (localStartLatency.mean +
|
628 | remoteStartLatency.mean +
|
629 | executionTime.mean +
|
630 | returnLatency.mean || 0);
|
631 | }
|
632 | function estimateTailLatency(fnStats, nStdDev) {
|
633 | return estimateFunctionLatency(fnStats) + nStdDev * fnStats.executionTime.stdev;
|
634 | }
|
635 | async function retryFunctionIfNeededToReduceTailLatency(timeSinceInitialInvocation, getTimeout, worker, shouldRetry, cancel) {
|
636 | let pending = true;
|
637 | let lastInvocationTime = Date.now();
|
638 | cancel.then(() => (pending = false));
|
639 | const doWork = async () => {
|
640 | lastInvocationTime = Date.now();
|
641 | await worker().catch(_ => { });
|
642 | pending = false;
|
643 | };
|
644 | const latency = () => Date.now() - lastInvocationTime;
|
645 | doWork();
|
646 | while (pending) {
|
647 | const timeout = getTimeout();
|
648 | if (latency() >= timeout && timeSinceInitialInvocation() > timeout + 1000) {
|
649 | if (shouldRetry()) {
|
650 | doWork();
|
651 | }
|
652 | else {
|
653 | return;
|
654 | }
|
655 | }
|
656 | const waitTime = (0, shared_1.roundTo100ms)(Math.max(timeout - latency(), 5000));
|
657 | await (0, shared_1.sleep)(waitTime, cancel);
|
658 | }
|
659 | }
|
660 | //# 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{ EventEmitter } from \"events\";\nimport { inspect } from \"util\";\nimport { v4 as uuidv4 } from \"uuid\";\nimport { AwsImpl, AwsOptions, AwsState } from \"./aws/aws-faast\";\nimport { CostMetric, CostSnapshot } from \"./cost\";\nimport { FaastError, FaastErrorNames, synthesizeFaastError } from \"./error\";\nimport { GoogleImpl, GoogleOptions, GoogleState } from \"./google/google-faast\";\nimport { LocalImpl, LocalOptions, LocalState } from \"./local/local-faast\";\nimport { inspectProvider, log } from \"./log\";\nimport {\n    FactoryMap,\n    FunctionCpuUsage,\n    FunctionStatsMap,\n    MemoryLeakDetector\n} from \"./metrics\";\nimport {\n    CallId,\n    CleanupOptionDefaults,\n    CleanupOptions,\n    CommonOptions,\n    FunctionStats,\n    IteratorResponseMessage,\n    PromiseResponseMessage,\n    Provider,\n    ProviderImpl,\n    UUID\n} from \"./provider\";\nimport { deserialize, serialize, serializeFunctionArgs } from \"./serialize\";\nimport { ExponentiallyDecayingAverageValue, roundTo100ms, sleep } from \"./shared\";\nimport { AsyncOrderedQueue, Deferred, Funnel, Pump, RateLimiter } from \"./throttle\";\nimport { FunctionCall, isGenerator } from \"./wrapper\";\nimport Module = require(\"module\");\n\n/**\n * An array of all available provider.\n * @public\n */\nexport const providers: Provider[] = [\"aws\", \"google\", \"local\"];\n\n/**\n * `Async<T>` maps regular values to Promises and Iterators to AsyncIterators,\n * If `T` is already a Promise or an AsyncIterator, it remains the same. This\n * type is used to infer the return value of cloud functions from the types of\n * the functions in the user's input module.\n * @public\n */\nexport type Async<T> = T extends AsyncGenerator<infer R>\n    ? AsyncGenerator<R>\n    : T extends Generator<infer R>\n    ? AsyncGenerator<R>\n    : T extends Promise<infer R>\n    ? Promise<R>\n    : Promise<T>;\n\n/**\n * `AsyncDetail<T>` is similar to {@link Async} except it maps retun values R to\n * `Detail<R>`, which is the return value with additional information about each\n * cloud function invocation.\n * @public\n */\nexport type AsyncDetail<T> = T extends AsyncGenerator<infer R>\n    ? AsyncGenerator<Detail<R>>\n    : T extends Generator<infer R>\n    ? AsyncGenerator<Detail<R>>\n    : T extends Promise<infer R>\n    ? Promise<Detail<R>>\n    : Promise<Detail<T>>;\n\n/**\n * `ProxyModule<M>` is the type of {@link FaastModule.functions}.\n * @remarks\n * `ProxyModule<M>` maps an imported module's functions to promise-returning or\n * async-iteratable versions of those functions. Non-function exports of the\n * module are omitted. When invoked, the functions in a `ProxyModule` invoke a\n * remote cloud function.\n * @public\n */\nexport type ProxyModule<M> = {\n    [K in keyof M]: M[K] extends (...args: infer A) => infer R\n        ? (...args: A) => Async<R>\n        : never;\n};\n\n/**\n * Similar to {@link ProxyModule} except each function returns a {@link Detail}\n * object.\n * @remarks\n * See {@link FaastModule.functionsDetail}.\n * @public\n */\nexport type ProxyModuleDetail<M> = {\n    [K in keyof M]: M[K] extends (...args: infer A) => infer R\n        ? (...args: A) => AsyncDetail<R>\n        : never;\n};\n\n/**\n * A function return value with additional detailed information.\n * @public\n */\nexport interface Detail<R> {\n    /**\n     * A Promise for the function's return value.\n     */\n    value: R;\n    /**\n     * The URL of the logs for the specific execution of this function call.\n     * @remarks\n     * This is different from the general logUrl from\n     * {@link FaastModule.logUrl}, which provides a link to the logs for all\n     * invocations of all functions within that module. Whereas this logUrl is\n     * only for this specific invocation.\n     */\n    logUrl?: string;\n    /**\n     * If available, the provider-specific execution identifier for this\n     * invocation.\n     * @remarks\n     * This ID may be added to the log entries for this invocation by the cloud\n     * provider.\n     */\n    executionId?: string;\n    /**\n     * If available, the provider-specific instance identifier for this\n     * invocation.\n     * @remarks\n     * This ID refers to the specific container or VM used to execute this\n     * function invocation. The instance may be reused across multiple\n     * invocations.\n     */\n    instanceId?: string;\n}\n\ninterface FunctionReturnWithMetrics {\n    response: PromiseResponseMessage | IteratorResponseMessage;\n    value: any;\n    localRequestSentTime: number;\n    localEndTime: number;\n    remoteResponseSentTime?: number;\n}\n\nasync function createFaastModuleProxy<M extends object, O extends CommonOptions, S>(\n    impl: ProviderImpl<O, S>,\n    fmodule: M,\n    userOptions?: O\n): Promise<FaastModuleProxy<M, O, S>> {\n    try {\n        const resolvedModule = resolve(fmodule);\n        const functionId = uuidv4() as UUID;\n        const options: Required<O> = { ...impl.defaults, ...userOptions };\n        log.provider(`options ${inspectProvider(options)}`);\n        return new FaastModuleProxy(\n            impl,\n            await impl.initialize(resolvedModule, functionId, options),\n            fmodule,\n            resolvedModule,\n            options as Required<CommonOptions>\n        );\n    } catch (err: any) {\n        throw new FaastError(err, \"could not initialize cloud function\");\n    }\n}\n\n/**\n * Summarize statistics about cloud function invocations.\n * @public\n */\nexport class FunctionStatsEvent {\n    /**\n     * @internal\n     */\n    constructor(\n        /** The name of the cloud function the statistics are about. */\n        readonly fn: string,\n        /** See {@link FunctionStats}. */\n        readonly stats: FunctionStats\n    ) {\n        this.stats = stats.clone();\n    }\n\n    /**\n     * Returns a string summarizing the statistics event.\n     * @remarks\n     * The string includes number of completed calls, errors, and retries, and\n     * the mean execution time for the calls that completed within the last time\n     * interval (1s).\n     */\n    toString() {\n        const executionTime = this.stats ? this.stats.executionTime.mean : 0;\n        return `[${this.fn}] ${this.stats}, executionTime: ${(\n            executionTime / 1000\n        ).toFixed(2)}s`;\n    }\n}\n\nclass PendingRequest {\n    queue: AsyncOrderedQueue<FunctionReturnWithMetrics> = new AsyncOrderedQueue();\n    created: number = Date.now();\n    executing?: boolean;\n\n    constructor(readonly call: FunctionCall) {}\n}\n\n/**\n * The main interface for invoking, cleaning up, and managing faast.js cloud\n * functions. Returned by {@link faast}.\n * @public\n */\nexport interface FaastModule<M extends object> {\n    /** See {@link Provider}.  */\n    provider: Provider;\n    /**\n     * Each call of a cloud function creates a separate remote invocation.\n     * @remarks\n     * The module passed into {@link faast} or its provider-specific variants\n     * ({@link faastAws}, {@link faastGoogle}, and {@link faastLocal}) is mapped\n     * to a {@link ProxyModule} version of the module, which performs the\n     * following mapping:\n     *\n     * - All function exports that are generators are mapped to async\n     *   generators.\n     *\n     * - All function exports that return async generators are preserved as-is.\n     *\n     * - All function exports that return promises have their type signatures\n     *   preserved as-is.\n     *\n     * - All function exports that return type T, where T is not a Promise,\n     *   Generator, or AsyncGenerator, are mapped to functions that return\n     *   Promise<T>. Argument types are preserved as-is.\n     *\n     * - All non-function exports are omitted in the remote module.\n     *\n     * Arguments and return values are serialized with `JSON.stringify` when\n     * cloud functions are called, therefore what is received on the remote side\n     * might not match what was sent. Faast.js attempts to detect nonsupported\n     * arguments on a best effort basis.\n     *\n     * If the cloud function throws an exception or rejects its promise with an\n     * instance of `Error`, then the function will reject with\n     * {@link FaastError} on the local side. If the exception or rejection\n     * resolves to any value that is not an instance of `Error`, the remote\n     * function proxy will reject with the value of\n     * `JSON.parse(JSON.stringify(err))`.\n     *\n     * Arguments and return values have size limitations that vary by provider\n     * and mode:\n     *\n     * - AWS: 256KB in queue mode, 6MB arguments and 256KB return values in https mode. See\n     *   {@link https://docs.aws.amazon.com/lambda/latest/dg/limits.html | AWS Lambda Limits}.\n     *\n     * - Google: 10MB in https and queue modes. See\n     *   {@link https://cloud.google.com/functions/quotas | Google Cloud Function Quotas}.\n     *\n     * - Local: limited only by available memory and the limits of\n     *   {@link https://nodejs.org/api/child_process.html#child_process_subprocess_send_message_sendhandle_options_callback | childprocess.send}.\n     *\n     * Note that payloads may be base64 encoded for some providers and therefore\n     * different in size than the original payload. Also, some bookkeeping data\n     * are passed along with arguments and contribute to the size limit.\n     */\n    functions: ProxyModule<M>;\n    /**\n     * Similar to {@link FaastModule.functions} except each function returns a\n     * {@link Detail} object\n     * @remarks\n     * Advanced users of faast.js may want more information about each function\n     * invocation than simply the result of the function call. For example, the\n     * specific logUrl for each invocation, to help with detailed debugging.\n     * This interface provides a way to get this detailed information.\n     */\n    functionsDetail: ProxyModuleDetail<M>;\n    /**\n     * Stop the faast.js runtime for this cloud function and clean up ephemeral\n     * cloud resources.\n     * @returns a Promise that resolves when the `FaastModule` runtime stops and\n     * ephemeral resources have been deleted.\n     * @remarks\n     * It is best practice to always call `cleanup` when done with a cloud\n     * function. A typical way to ensure this in normal execution is to use the\n     * `finally` construct:\n     *\n     * ```typescript\n     * const faastModule = await faast(\"aws\", m);\n     * try {\n     *     // Call faastModule.functions.*\n     * } finally {\n     *     // Note the `await`\n     *     await faastModule.cleanup();\n     * }\n     * ```\n     *\n     * After the cleanup promise resolves, the cloud function instance can no\n     * longer invoke new calls on {@link FaastModule.functions}. However, other\n     * methods on {@link FaastModule} are safe to call, such as\n     * {@link FaastModule.costSnapshot}.\n     *\n     * Cleanup also stops statistics events (See {@link FaastModule.off}).\n     *\n     * By default, cleanup will delete all ephemeral cloud resources but leave\n     * behind cached resources for use by future cloud functions. Deleted\n     * resources typically include cloud functions, queues, and queue\n     * subscriptions. Logs are not deleted by cleanup.\n     *\n     * Note that `cleanup` leaves behind some provider-specific resources:\n     *\n     * - AWS: Cloudwatch logs are preserved until the garbage collector in a\n     *   future cloud function instance deletes them. The default log expiration\n     *   time is 24h (or the value of {@link CommonOptions.retentionInDays}). In\n     *   addition, the AWS Lambda IAM role is not deleted by cleanup. This role\n     *   is shared across cloud function instances. Lambda layers are also not\n     *   cleaned up immediately on AWS when {@link CommonOptions.packageJson} is\n     *   used and {@link CommonOptions.useDependencyCaching} is true. Cached\n     *   layers are cleaned up by garbage collection. Also see\n     *   {@link CleanupOptions.deleteCaches}.\n     *\n     * - Google: Google Stackdriver automatically deletes log entries after 30\n     *   days.\n     *\n     * - Local: Logs are preserved in a temporary directory on local disk.\n     *   Garbage collection in a future cloud function instance will delete logs\n     *   older than 24h.\n     */\n    cleanup(options?: CleanupOptions): Promise<void>;\n    /**\n     * The URL of logs generated by this cloud function.\n     * @remarks\n     * Logs are not automatically downloaded because they cause outbound data\n     * transfer, which can be expensive. Also, logs may arrive at the logging\n     * service well after the cloud functions have completed. This log URL\n     * specifically filters the logs for this cloud function instance.\n     * Authentication is required to view cloud provider logs.\n     *\n     * The local provider returns a `file://` url pointing to a file for logs.\n     */\n    logUrl(): string;\n    /**\n     * Register a callback for statistics events.\n     * @remarks\n     * The callback is invoked once for each cloud function that was invoked\n     * within the last 1s interval, with a {@link FunctionStatsEvent}\n     * summarizing the statistics for each function. Typical usage:\n     *\n     * ```typescript\n     * faastModule.on(\"stats\", console.log);\n     * ```\n     */\n    on(name: \"stats\", listener: (statsEvent: FunctionStatsEvent) => void): void;\n    /**\n     * Deregister a callback for statistics events.\n     * @remarks\n     * Stops the callback listener from receiving future function statistics\n     * events. Calling {@link FaastModule.cleanup} also turns off statistics\n     * events.\n     */\n    off(name: \"stats\", listener: (statsEvent: FunctionStatsEvent) => void): void;\n    /**\n     * Get a near real-time cost estimate of cloud function invocations.\n     * @returns a Promise for a {@link CostSnapshot}.\n     * @remarks\n     * A cost snapshot provides a near real-time estimate of the costs of the\n     * cloud functions invoked. The cost estimate only includes the cost of\n     * successfully completed calls. Unsuccessful calls may lack the data\n     * required to provide cost information. Calls that are still in flight are\n     * not included in the cost snapshot. For this reason, it is typically a\n     * good idea to get a cost snapshot after awaiting the result of\n     * {@link FaastModule.cleanup}.\n     *\n     * Code example:\n     *\n     * ```typescript\n     * const faastModule = await faast(\"aws\", m);\n     * try {\n     *     // invoke cloud functions on faastModule.functions.*\n     * } finally {\n     *      await faastModule.cleanup();\n     *      const costSnapshot = await faastModule.costSnapshot();\n     *      console.log(costSnapshot);\n     * }\n     * ```\n     */\n    costSnapshot(): Promise<CostSnapshot>;\n\n    /**\n     * Statistics for a specific function or the entire faast.js module.\n     *\n     * @param functionName - The name of the function to retrieve statistics\n     * for. If the function does not exist or has not been invoked, a new\n     * instance of {@link FunctionStats} is returned with zero values. If\n     * `functionName` omitted (undefined), then aggregate statistics are\n     * returned that summarize all cloud functions within this faast.js module.\n     * @returns an snapshot of {@link FunctionStats} at a point in time.\n     */\n    stats(functionName?: string): FunctionStats;\n}\n\n/**\n * Implementation of {@link FaastModule}.\n * @remarks\n * `FaastModuleProxy` provides a unified developer experience for faast.js\n * modules on top of provider-specific runtime APIs. Most users will not create\n * `FaastModuleProxy` instances themselves; instead use {@link faast}, or\n * {@link faastAws}, {@link faastGoogle}, or {@link faastLocal}.\n * `FaastModuleProxy` implements the {@link FaastModule} interface, which is the\n * preferred public interface for faast modules. `FaastModuleProxy` can be used\n * to access provider-specific details and state, and is useful for deeper\n * testing.\n * @public\n */\nexport class FaastModuleProxy<M extends object, O, S> implements FaastModule<M> {\n    /** The {@link Provider}, e.g. \"aws\" or \"google\". */\n    provider = this.impl.name;\n    /** {@inheritdoc FaastModule.functions} */\n    functions: ProxyModule<M>;\n    /** {@inheritdoc FaastModule.functionsDetail} */\n    functionsDetail: ProxyModuleDetail<M>;\n    /** @internal */\n    private _stats = new FunctionStatsMap();\n    private _cpuUsage = new FactoryMap(\n        () => new FactoryMap((_: number) => new FunctionCpuUsage())\n    );\n    private _memoryLeakDetector: MemoryLeakDetector;\n    private _funnel: Funnel<any>;\n    private _rateLimiter?: RateLimiter<any>;\n    private _skew = new ExponentiallyDecayingAverageValue(0.3);\n    private _statsTimer?: NodeJS.Timer;\n    private _cleanupHooks: Set<Deferred> = new Set();\n    private _initialInvocationTime = new FactoryMap(() => Date.now());\n    private _callResultsPending: Map<CallId, PendingRequest> = new Map();\n    private _collectorPump: Pump<void>;\n    private _emitter = new EventEmitter();\n\n    /**\n     * Constructor\n     * @internal\n     */\n    constructor(\n        private impl: ProviderImpl<O, S>,\n        /** @internal */\n        readonly state: S,\n        private fmodule: M,\n        private modulePath: string,\n        /** The options set for this instance, which includes default values. */\n        readonly options: Required<CommonOptions>\n    ) {\n        log.info(`Node version: ${process.version}`);\n        log.provider(`name: ${this.impl.name}`);\n        log.provider(`responseQueueId: ${this.impl.responseQueueId(state)}`);\n        log.provider(`logUrl: ${this.impl.logUrl(state)}`);\n        log.info(`Log url: ${impl.logUrl(state)}`);\n\n        this._funnel = new Funnel<any>(options.concurrency);\n        if (options.rate) {\n            this._rateLimiter = new RateLimiter(options.rate, 1);\n        }\n        this._memoryLeakDetector = new MemoryLeakDetector(options.memorySize);\n        const functionsDetail: any = {};\n        const functions: any = {};\n        for (const name of Object.keys(fmodule)) {\n            const origFunction = (fmodule as any)[name];\n            if (typeof origFunction === \"function\") {\n                if (isGenerator(origFunction)) {\n                    const func = this.wrapGenerator(origFunction);\n                    functionsDetail[name] = func;\n                    functions[name] = async function* (...args: any[]) {\n                        const generator = func(...args);\n                        for await (const iter of generator) {\n                            yield iter.value;\n                        }\n                    };\n                } else {\n                    const func = this.wrapFunction(origFunction);\n                    functionsDetail[name] = func;\n                    functions[name] = (...args: any[]) =>\n                        func(...args).then(p => p.value);\n                }\n            }\n        }\n        this.functions = functions;\n        this.functionsDetail = functionsDetail;\n        this._collectorPump = new Pump({ concurrency: 2 }, () => this.resultCollector());\n        this._collectorPump.start();\n    }\n\n    /** {@inheritdoc FaastModule.cleanup} */\n    async cleanup(userCleanupOptions: CleanupOptions = {}) {\n        try {\n            this._stats.clear();\n            this._memoryLeakDetector.clear();\n            this._funnel.clear();\n            this._rateLimiter?.clear();\n            this._cleanupHooks.forEach(hook => hook.resolve());\n            this._cleanupHooks.clear();\n            this._emitter.removeAllListeners();\n            this.stopStats();\n            this._initialInvocationTime.clear();\n            this._callResultsPending.clear();\n            this._collectorPump.stop();\n            log.provider(`cleanup`);\n            const options = { ...CleanupOptionDefaults, ...userCleanupOptions };\n            const { gcTimeout } = options;\n            let timedout = false;\n            if (gcTimeout > 0) {\n                const timeout = sleep(gcTimeout * 1000).then(() => (timedout = true));\n                await Promise.race([this.impl.cleanup(this.state, options), timeout]);\n            } else {\n                await this.impl.cleanup(this.state, options);\n            }\n            if (timedout) {\n                log.provider(`cleanup timed out after ${gcTimeout}s`);\n            } else {\n                log.provider(`cleanup done`);\n            }\n        } catch (err: any) {\n            throw new FaastError(err, \"failed in cleanup\");\n        }\n    }\n\n    /** {@inheritdoc FaastModule.logUrl} */\n    logUrl() {\n        const rv = this.impl.logUrl(this.state);\n        log.provider(`logUrl ${rv}`);\n        return rv;\n    }\n\n    private startStats(interval: number = 1000) {\n        this._statsTimer = setInterval(() => {\n            this._stats.fIncremental.forEach((stats, fn) => {\n                this._emitter.emit(\"stats\", new FunctionStatsEvent(fn, stats));\n            });\n\n            this._stats.resetIncremental();\n        }, interval);\n    }\n\n    private stopStats() {\n        this._statsTimer && clearInterval(this._statsTimer);\n        this._statsTimer = undefined;\n    }\n\n    /** {@inheritdoc FaastModule.on} */\n    on(name: \"stats\", listener: (statsEvent: FunctionStatsEvent) => void) {\n        if (!this._statsTimer) {\n            this.startStats();\n        }\n        this._emitter.on(name, listener);\n    }\n\n    /** {@inheritdoc FaastModule.off} */\n    off(name: \"stats\", listener: (statsEvent: FunctionStatsEvent) => void) {\n        this._emitter.off(name, listener);\n        if (this._emitter.listenerCount(name) === 0) {\n            this.stopStats();\n        }\n    }\n\n    private async withCancellation<T>(\n        fn: (cancel: Promise<void>) => Promise<T>\n    ): Promise<T> {\n        const deferred = new Deferred();\n        this._cleanupHooks.add(deferred);\n        const promise = fn(deferred.promise);\n        try {\n            return await promise;\n        } finally {\n            this._cleanupHooks.delete(deferred);\n        }\n    }\n\n    private processResponse<R>(\n        returned: FunctionReturnWithMetrics,\n        functionName: string,\n        localStartTime: number\n    ): Promise<Detail<R>> {\n        const { response } = returned;\n        const { logUrl, instanceId, memoryUsage } = response;\n        let value: Promise<Detail<R>>;\n\n        if (response.type === \"reject\") {\n            const error = response.isErrorObject\n                ? synthesizeFaastError({\n                      errObj: returned.value,\n                      logUrl: ` ${logUrl} `,\n                      functionName\n                  })\n                : returned.value;\n            value = Promise.reject(error);\n            value.catch((_silenceWarningLackOfSynchronousCatch: any) => {});\n        } else {\n            const { executionId } = returned.response;\n            const detail = {\n                value: returned.value[0],\n                logUrl,\n                executionId,\n                instanceId,\n                memoryUsage\n            };\n            value = Promise.resolve(detail);\n        }\n        const { localRequestSentTime, remoteResponseSentTime, localEndTime } = returned;\n        const { remoteExecutionStartTime, remoteExecutionEndTime } = response;\n        const fstats = this._stats;\n        if (remoteExecutionStartTime && remoteExecutionEndTime) {\n            const localStartLatency = localRequestSentTime - localStartTime;\n            const roundTripLatency = localEndTime - localRequestSentTime;\n            const executionTime = remoteExecutionEndTime - remoteExecutionStartTime;\n            const sendResponseLatency = Math.max(\n                0,\n                (remoteResponseSentTime || remoteExecutionEndTime) -\n                    remoteExecutionEndTime\n            );\n            const networkLatency = roundTripLatency - executionTime - sendResponseLatency;\n            const estimatedRemoteStartTime = localRequestSentTime + networkLatency / 2;\n            const estimatedSkew = estimatedRemoteStartTime - remoteExecutionStartTime;\n            let skew = estimatedSkew;\n            if (fstats.aggregate.completed > 1) {\n                this._skew.update(skew);\n                skew = this._skew.value;\n            }\n\n            const remoteStartLatency = Math.max(\n                1,\n                remoteExecutionStartTime + skew - localRequestSentTime\n            );\n            const returnLatency = Math.max(\n                1,\n                localEndTime - (remoteExecutionEndTime + skew)\n            );\n            fstats.update(functionName, \"localStartLatency\", localStartLatency);\n            fstats.update(functionName, \"remoteStartLatency\", remoteStartLatency);\n            fstats.update(functionName, \"executionTime\", executionTime);\n            fstats.update(functionName, \"sendResponseLatency\", sendResponseLatency);\n            fstats.update(functionName, \"returnLatency\", returnLatency);\n\n            const billed = (executionTime || 0) + (sendResponseLatency || 0);\n            const estimatedBilledTime = Math.max(100, Math.ceil(billed / 100) * 100);\n            fstats.update(functionName, \"estimatedBilledTime\", estimatedBilledTime);\n        }\n\n        if (response.type === \"reject\") {\n            fstats.incr(functionName, \"errors\");\n        } else {\n            fstats.incr(functionName, \"completed\");\n        }\n\n        if (instanceId && memoryUsage) {\n            if (\n                this._memoryLeakDetector.detectedNewLeak(\n                    functionName,\n                    instanceId,\n                    memoryUsage\n                )\n            ) {\n                log.leaks(`Possible memory leak detected in function '${functionName}'.`);\n                log.leaks(\n                    `Memory use before execution leaked from prior calls: %O`,\n                    memoryUsage\n                );\n                log.leaks(`Logs: ${logUrl} `);\n                log.leaks(\n                    `These logs show only one example faast cloud function invocation that may have a leak.`\n                );\n            }\n        }\n        return value;\n    }\n\n    private invoke(fname: string, args: any[], callId: string) {\n        const ResponseQueueId = this.impl.responseQueueId(this.state);\n        const callObject: FunctionCall = {\n            name: fname,\n            args: serializeFunctionArgs(fname, args, this.options.validateSerialization),\n            callId,\n            modulePath: this.modulePath,\n            ResponseQueueId\n        };\n\n        log.calls(`Calling '${fname}' (${callId})`);\n        const pending = new PendingRequest(callObject);\n        this._callResultsPending.set(callId, pending);\n        if (this._collectorPump.stopped) {\n            this._collectorPump.start();\n        }\n\n        this.withCancellation(async cancel => {\n            await this.impl.invoke(this.state, pending.call, cancel).catch(err =>\n                pending.queue.pushImmediate({\n                    response: {\n                        kind: \"promise\",\n                        type: \"reject\",\n                        callId,\n                        isErrorObject: typeof err === \"object\" && err instanceof Error,\n                        value: serialize(err)\n                    },\n                    value: err,\n                    localEndTime: Date.now(),\n                    localRequestSentTime: pending.created\n                })\n            );\n        });\n        return pending;\n    }\n\n    private lookupFname(fn: Function) {\n        let fname = fn.name;\n        if (!fname) {\n            for (const key of Object.keys(this.fmodule)) {\n                if ((this.fmodule as any)[key] === fn) {\n                    fname = key;\n                    log.info(`Found arrow function name: ${key}`);\n                    break;\n                }\n            }\n        }\n        if (!fname) {\n            throw new FaastError(`Could not find function name`);\n        }\n        return fname;\n    }\n\n    private createCallId() {\n        return uuidv4();\n    }\n\n    private wrapGenerator<A extends any[], R>(\n        fn: ((...args: A) => AsyncGenerator<R>) | ((...args: A) => Generator<R>)\n    ): (...args: A) => AsyncIterableIterator<Detail<R>> {\n        return (...args: A) => {\n            const startTime = Date.now();\n            let fname = this.lookupFname(fn);\n            const callId = this.createCallId();\n            const pending = this.invoke(fname, args, callId);\n            log.provider(`invoke ${inspectProvider(pending.call)}`);\n            this._stats.incr(fname, \"invocations\");\n            return {\n                [Symbol.asyncIterator]() {\n                    return this;\n                },\n                next: () =>\n                    pending.queue.next().then(async next => {\n                        const promise = this.processResponse<IteratorYieldResult<R>>(\n                            next,\n                            fname,\n                            startTime\n                        );\n                        const result = await promise;\n                        log.calls(`yielded ${inspect(result)}`);\n                        const { value, ...rest } = result;\n                        if (result.value.done) {\n                            this.clearPending(callId);\n                            return { done: true, value: rest };\n                        } else {\n                            return {\n                                done: false,\n                                value: { ...rest, value: value.value }\n                            };\n                        }\n                    })\n            };\n        };\n    }\n\n    private clearPending(callId: string) {\n        this._callResultsPending.delete(callId);\n        if (this._callResultsPending.size === 0) {\n            this._collectorPump.stop();\n        }\n    }\n\n    private wrapFunction<A extends any[], R>(\n        fn: (...args: A) => R\n    ): (...args: A) => Async<Detail<R>> {\n        return (...args: A) => {\n            const startTime = Date.now();\n            let fname = this.lookupFname(fn);\n            const callId = this.createCallId();\n            const tryInvoke = async () => {\n                const pending = this.invoke(fname, args, callId);\n                log.provider(`invoke ${inspectProvider(pending.call)}`);\n                this._stats.incr(fname, \"invocations\");\n                const responsePromise = pending.queue.next();\n                const rv = await responsePromise;\n                this.clearPending(callId);\n                log.calls(`Returning '${fname}' (${callId}): ${inspect(rv)}`);\n                return this.processResponse<R>(rv, fname, startTime);\n            };\n\n            const funnel = this._funnel;\n\n            let retries = 0;\n            const shouldRetry = (err: any) => {\n                if (err instanceof FaastError) {\n                    if (FaastError.hasCauseWithName(err, FaastErrorNames.ESERIALIZE)) {\n                        return false;\n                    }\n                    // Don't retry user-generated errors. Only errors caused by\n                    // failures of operations faast itself initiated (e.g. cloud\n                    // service APIs) are retried.\n                    if (FaastError.hasCauseWithName(err, FaastErrorNames.EEXCEPTION)) {\n                        return false;\n                    }\n                }\n                if (retries < this.options.maxRetries) {\n                    retries++;\n                    this._stats.incr(fname, \"retries\");\n                    log.info(\n                        `faast: func: ${fname} attempts: ${retries}, err: ${inspectProvider(\n                            err\n                        )}`\n                    );\n                    return true;\n                }\n                return false;\n            };\n\n            if (this._rateLimiter) {\n                return funnel.push(\n                    () => this._rateLimiter!.push(tryInvoke),\n                    shouldRetry\n                ) as Async<Detail<R>>;\n            } else {\n                return funnel.push(tryInvoke, shouldRetry) as Async<Detail<R>>;\n            }\n        };\n    }\n\n    /** {@inheritdoc FaastModule.costSnapshot} */\n    async costSnapshot() {\n        const estimate = await this.impl.costSnapshot(this.state, this._stats.aggregate);\n        log.provider(`costSnapshot returned ${inspectProvider(estimate)}`);\n        if (this._stats.aggregate.retries > 0) {\n            const { retries, invocations } = this._stats.aggregate;\n            const retryPct = ((retries / invocations) * 100).toFixed(1);\n            estimate.push(\n                new CostMetric({\n                    name: \"retries\",\n                    pricing: 0,\n                    measured: retries,\n                    unit: \"retry\",\n                    unitPlural: \"retries\",\n                    comment: `Retries were ${retryPct}% of requests and may have incurred charges not accounted for by faast.`,\n                    informationalOnly: true\n                })\n            );\n        }\n        return estimate;\n    }\n\n    /** {@inheritdoc FaastModule.stats} */\n    stats(functionName?: string) {\n        if (functionName) {\n            return this._stats.fAggregate.getOrCreate(functionName).clone();\n        }\n        return this._stats.aggregate.clone();\n    }\n\n    private async resultCollector() {\n        const { _callResultsPending: callResultsPending } = this;\n        if (!callResultsPending.size) {\n            return;\n        }\n\n        log.provider(`polling ${this.impl.responseQueueId(this.state)}`);\n        const pollResult = await this.withCancellation(cancel =>\n            this.impl.poll(this.state, cancel)\n        );\n        log.provider(`poll returned ${inspectProvider(pollResult)}`);\n        const { Messages, isFullMessageBatch } = pollResult;\n        const localEndTime = Date.now();\n        this.adjustCollectorConcurrencyLevel(isFullMessageBatch);\n\n        for (const m of Messages) {\n            switch (m.kind) {\n                case \"functionstarted\": {\n                    const pending = callResultsPending.get(m.callId);\n                    if (pending) {\n                        pending!.executing = true;\n                    }\n                    break;\n                }\n                case \"promise\":\n                case \"iterator\":\n                    try {\n                        const { timestamp } = m;\n                        const value = deserialize(m.value);\n                        const pending = callResultsPending.get(m.callId);\n                        if (pending) {\n                            const rv: FunctionReturnWithMetrics = {\n                                response: m,\n                                value,\n                                remoteResponseSentTime: timestamp,\n                                localRequestSentTime: pending.created,\n                                localEndTime\n                            };\n                            log.provider(`returned ${inspectProvider(value)}`);\n                            if (m.kind === \"iterator\") {\n                                pending.queue.push(rv, m.sequence);\n                            } else {\n                                pending.queue.pushImmediate(rv);\n                            }\n                        } else {\n                            log.info(`Pending promise not found for CallId: ${m.callId}`);\n                        }\n                    } catch (err: any) {\n                        log.warn(err);\n                    }\n                    break;\n                case \"cpumetrics\":\n                    const { metrics } = m;\n                    const pending = callResultsPending.get(m.callId);\n                    if (!pending) {\n                        return;\n                    }\n                    const stats = this._cpuUsage.getOrCreate(pending.call.name);\n                    const secondMetrics = stats.getOrCreate(\n                        Math.round(metrics.elapsed / 1000)\n                    );\n                    secondMetrics.stime.update(metrics.stime);\n                    secondMetrics.utime.update(metrics.utime);\n                    secondMetrics.cpuTime.update(metrics.stime + metrics.utime);\n                    break;\n            }\n        }\n    }\n\n    private adjustCollectorConcurrencyLevel(full?: boolean) {\n        const nPending = this._callResultsPending.size;\n        if (nPending > 0) {\n            let nCollectors = full ? Math.floor(nPending / 20) + 2 : 2;\n            nCollectors = Math.min(nCollectors, 10);\n            const pump = this._collectorPump;\n            const previous = pump.concurrency;\n            pump.setMaxConcurrency(nCollectors);\n            if (previous !== pump.concurrency) {\n                log.info(\n                    `Result collectors running: ${pump.getConcurrency()}, new max: ${\n                        pump.concurrency\n                    }`\n                );\n            }\n        }\n    }\n}\n\n/**\n * The return type of {@link faastAws}. See {@link FaastModuleProxy}.\n * @public\n */\nexport type AwsFaastModule<M extends object = object> = FaastModuleProxy<\n    M,\n    AwsOptions,\n    AwsState\n>;\n\n/**\n * The return type of {@link faastGoogle}. See {@link FaastModuleProxy}.\n * @public\n */\nexport type GoogleFaastModule<M extends object = object> = FaastModuleProxy<\n    M,\n    GoogleOptions,\n    GoogleState\n>;\n\n/**\n * The return type of {@link faastLocal}. See {@link FaastModuleProxy}.\n * @public\n */\nexport type LocalFaastModule<M extends object = object> = FaastModuleProxy<\n    M,\n    LocalOptions,\n    LocalState\n>;\n\nfunction resolve(fmodule: object) {\n    const cache = (Module as any)._cache;\n    let modulePath: string | undefined;\n    for (const key of Object.keys(cache).reverse()) {\n        if (cache[key].exports === fmodule) {\n            modulePath = key;\n            break;\n        }\n    }\n    if (!modulePath) {\n        throw new FaastError(\n            { info: { module: fmodule } },\n            `Could not find file for module, must use \"import * as X from Y\" or \"X = require(Y)\" to load a module for faast.`\n        );\n    }\n    log.info(`Found file: ${modulePath}`);\n    return modulePath;\n}\n\n/**\n * The main entry point for faast with any provider and only common options.\n * @param provider - One of `\"aws\"`, `\"google\"`, or `\"local\"`. See\n * {@link Provider}.\n * @param fmodule - A module imported with `import * as X from \"Y\";`. Using\n * `require` also works but loses type information.\n * @param options - See {@link CommonOptions}.\n * @returns See {@link FaastModule}.\n * @remarks\n * Example of usage:\n * ```typescript\n * import { faast } from \"faastjs\";\n * import * as mod from \"./path/to/module\";\n * (async () => {\n *     const faastModule = await faast(\"aws\", mod);\n *     try {\n *         const result = await faastModule.functions.func(\"arg\");\n *     } finally {\n *         await faastModule.cleanup();\n *     }\n * })();\n * ```\n * @public\n */\nexport async function faast<M extends object>(\n    provider: Provider,\n    fmodule: M,\n    options?: CommonOptions\n): Promise<FaastModule<M>> {\n    switch (provider) {\n        case \"aws\":\n            return faastAws(fmodule, options);\n        case \"google\":\n            return faastGoogle(fmodule, options);\n        case \"local\":\n            return faastLocal(fmodule, options);\n        default:\n            throw new FaastError(`Unknown cloud provider option '${provider}'`);\n    }\n}\n\n/**\n * The main entry point for faast with AWS provider.\n * @param fmodule - A module imported with `import * as X from \"Y\";`. Using\n * `require` also works but loses type information.\n * @param options - Most common options are in {@link CommonOptions}.\n * Additional AWS-specific options are in {@link AwsOptions}.\n * @public\n */\nexport function faastAws<M extends object>(\n    fmodule: M,\n    options?: AwsOptions\n): Promise<AwsFaastModule<M>> {\n    return createFaastModuleProxy<M, AwsOptions, AwsState>(AwsImpl, fmodule, options);\n}\n\n/**\n * The main entry point for faast with Google provider.\n * @param fmodule - A module imported with `import * as X from \"Y\";`. Using\n * `require` also works but loses type information.\n * @param options - Most common options are in {@link CommonOptions}.\n * Additional Google-specific options are in {@link GoogleOptions}.\n * @public\n */\nexport function faastGoogle<M extends object>(\n    fmodule: M,\n    options?: GoogleOptions\n): Promise<GoogleFaastModule<M>> {\n    return createFaastModuleProxy<M, GoogleOptions, GoogleState>(\n        GoogleImpl,\n        fmodule,\n        options\n    );\n}\n\n/**\n * The main entry point for faast with Local provider.\n * @param fmodule - A module imported with `import * as X from \"Y\";`. Using\n * `require` also works but loses type information.\n * @param options - Most common options are in {@link CommonOptions}.\n * Additional Local-specific options are in {@link LocalOptions}.\n * @returns a Promise for {@link LocalFaastModule}.\n * @public\n */\nexport function faastLocal<M extends object>(\n    fmodule: M,\n    options?: LocalOptions\n): Promise<LocalFaastModule<M>> {\n    return createFaastModuleProxy<M, LocalOptions, LocalState>(\n        LocalImpl,\n        fmodule,\n        options\n    );\n}\n\nfunction estimateFunctionLatency(fnStats: FunctionStats) {\n    const { executionTime, localStartLatency, remoteStartLatency, returnLatency } =\n        fnStats;\n\n    return (\n        localStartLatency.mean +\n            remoteStartLatency.mean +\n            executionTime.mean +\n            returnLatency.mean || 0\n    );\n}\n\nfunction estimateTailLatency(fnStats: FunctionStats, nStdDev: number) {\n    return estimateFunctionLatency(fnStats) + nStdDev * fnStats.executionTime.stdev;\n}\n\nasync function retryFunctionIfNeededToReduceTailLatency(\n    timeSinceInitialInvocation: () => number,\n    getTimeout: () => number,\n    worker: () => Promise<void>,\n    shouldRetry: () => boolean,\n    cancel: Promise<void>\n) {\n    let pending = true;\n    let lastInvocationTime: number = Date.now();\n\n    cancel.then(() => (pending = false));\n\n    const doWork = async () => {\n        lastInvocationTime = Date.now();\n        await worker().catch(_ => {});\n        pending = false;\n    };\n\n    const latency = () => Date.now() - lastInvocationTime;\n\n    doWork();\n\n    while (pending) {\n        const timeout = getTimeout();\n        if (latency() >= timeout && timeSinceInitialInvocation() > timeout + 1000) {\n            if (shouldRetry()) {\n                doWork();\n            } else {\n                return;\n            }\n        }\n        const waitTime = roundTo100ms(Math.max(timeout - latency(), 5000));\n        await sleep(waitTime, cancel);\n    }\n}\n"]} |
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