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1"use strict";
2Object.defineProperty(exports, "__esModule", { value: true });
3exports.CostAnalyzer = exports.CostSnapshot = exports.CostMetric = void 0;
4const Listr = require("listr");
5const util_1 = require("util");
6const index_1 = require("../index");
7const shared_1 = require("./shared");
8const throttle_1 = require("./throttle");
9/**
10 * A line item in the cost estimate, including the resource usage metric
11 * measured and its pricing.
12 * @public
13 */
14class CostMetric {
15 /** @internal */
16 constructor(arg) {
17 this.name = arg.name;
18 this.pricing = arg.pricing;
19 this.unit = arg.unit;
20 this.measured = arg.measured;
21 this.unitPlural = arg.unitPlural;
22 this.comment = arg.comment;
23 this.informationalOnly = arg.informationalOnly;
24 }
25 /**
26 * The cost contribution of this cost metric. Equal to
27 * {@link CostMetric.pricing} * {@link CostMetric.measured}.
28 */
29 cost() {
30 return this.pricing * this.measured;
31 }
32 /**
33 * Return a string with the cost estimate for this metric, omitting
34 * comments.
35 */
36 describeCostOnly() {
37 const p = (n, precision = 8) => Number.isInteger(n) ? String(n) : n.toFixed(precision);
38 const getUnit = (n) => {
39 if (n > 1) {
40 return (this.unitPlural ||
41 (!this.unit.match(/[A-Z]$/) ? this.unit + "s" : this.unit));
42 }
43 else {
44 return this.unit;
45 }
46 };
47 const cost = `$${p(this.cost())}`;
48 const pricing = `$${p(this.pricing)}/${this.unit}`;
49 const metric = p(this.measured, this.unit === "second" ? 1 : 8);
50 const unit = getUnit(this.measured);
51 return `${this.name.padEnd(21)} ${pricing.padEnd(20)} ${metric.padStart(12)} ${unit.padEnd(10)} ${cost.padEnd(14)}`;
52 }
53 /** Describe this cost metric, including comments. */
54 toString() {
55 return `${this.describeCostOnly()}${(this.comment && `// ${this.comment}`) || ""}`;
56 }
57}
58exports.CostMetric = CostMetric;
59/**
60 * A summary of the costs incurred by a faast.js module at a point in time.
61 * Output of {@link FaastModule.costSnapshot}.
62 * @remarks
63 * Cost information provided by faast.js is an estimate. It is derived from
64 * internal faast.js measurements and not by consulting data provided by your
65 * cloud provider.
66 *
67 * **Faast.js does not guarantee the accuracy of cost estimates.**
68 *
69 * **Use at your own risk.**
70 *
71 * Example using AWS:
72 * ```typescript
73 * const faastModule = await faast("aws", m);
74 * try {
75 * // Invoke faastModule.functions.*
76 * } finally {
77 * await faastModule.cleanup();
78 * console.log(`Cost estimate:`);
79 * console.log(`${await faastModule.costSnapshot()}`);
80 * }
81 * ```
82 *
83 * AWS example output:
84 * ```text
85 * Cost estimate:
86 * functionCallDuration $0.00002813/second 0.6 second $0.00001688 68.4% [1]
87 * sqs $0.00000040/request 9 requests $0.00000360 14.6% [2]
88 * sns $0.00000050/request 5 requests $0.00000250 10.1% [3]
89 * functionCallRequests $0.00000020/request 5 requests $0.00000100 4.1% [4]
90 * outboundDataTransfer $0.09000000/GB 0.00000769 GB $0.00000069 2.8% [5]
91 * logIngestion $0.50000000/GB 0 GB $0 0.0% [6]
92 * ---------------------------------------------------------------------------------------
93 * $0.00002467 (USD)
94 *
95 * * Estimated using highest pricing tier for each service. Limitations apply.
96 * ** Does not account for free tier.
97 * [1]: https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)
98 * [2]: https://aws.amazon.com/sqs/pricing
99 * [3]: https://aws.amazon.com/sns/pricing
100 * [4]: https://aws.amazon.com/lambda/pricing
101 * [5]: https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer
102 * [6]: https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included.
103 * ```
104 *
105 * A cost snapshot contains several {@link CostMetric} values. Each `CostMetric`
106 * summarizes one component of the overall cost of executing the functions so
107 * far. Some cost metrics are common to all faast providers, and other metrics
108 * are provider-specific. The common metrics are:
109 *
110 * - `functionCallDuration`: the estimated billed CPU time (rounded to the next
111 * 100ms) consumed by completed cloud function calls. This is the metric that
112 * usually dominates cost.
113 *
114 * - `functionCallRequests`: the number of invocation requests made. Most
115 * providers charge for each invocation.
116 *
117 * Provider-specific metrics vary. For example, AWS has the following additional
118 * metrics:
119 *
120 * - `sqs`: AWS Simple Queueing Service. This metric captures the number of
121 * queue requests made to insert and retrieve queued results (each 64kb chunk
122 * is counted as an additional request). SQS is used even if
123 * {@link CommonOptions.mode} is not set to `"queue"`, because it is necessary
124 * for monitoring cloud function invocations.
125 *
126 * - `sns`: AWS Simple Notification Service. SNS is used to invoke Lambda
127 * functions when {@link CommonOptions.mode} is `"queue"`.
128 *
129 * - `outboundDataTransfer`: an estimate of the network data transferred out
130 * from the cloud provider for this faast.js module. This estimate only counts
131 * data returned from cloud function invocations and infrastructure that
132 * faast.js sets up. It does not count any outbound data sent by your cloud
133 * functions that are not known to faast.js. Note that if you run faast.js on
134 * EC2 in the same region (see {@link AwsOptions.region}), then the data
135 * transfer costs will be zero (however, the cost snapshot will not include
136 * EC2 costs). Also note that if your cloud function transfers data from/to S3
137 * buckets in the same region, there is no cost as long as that data is not
138 * returned from the function.
139 *
140 * - `logIngestion`: this cost metric is always zero for AWS. It is present to
141 * remind the user that AWS charges for log data ingested by CloudWatch Logs
142 * that are not measured by faast.js. Log entries may arrive significantly
143 * after function execution completes, and there is no way for faast.js to
144 * know exactly how long to wait, therefore it does not attempt to measure
145 * this cost. In practice, if your cloud functions do not perform extensive
146 * logging on all invocations, log ingestion costs from faast.js are likely to
147 * be low or fall within the free tier.
148 *
149 * For Google, extra metrics include `outboundDataTransfer` similar to AWS, and
150 * `pubsub`, which combines costs that are split into `sns` and `sqs` on AWS.
151 *
152 * The Local provider has no extra metrics.
153 *
154 * Prices are retrieved dynamically from AWS and Google and cached locally.
155 * Cached prices expire after 24h. For each cost metric, faast.js uses the
156 * highest price tier to compute estimated pricing.
157 *
158 * Cost estimates do not take free tiers into account.
159 * @public
160 */
161class CostSnapshot {
162 /** @internal */
163 constructor(
164 /** The {@link Provider}, e.g. "aws" or "google" */
165 provider,
166 /**
167 * The options used to initialize the faast.js module where this cost
168 * snapshot was generated.
169 */
170 options, stats, costMetrics = []) {
171 this.provider = provider;
172 this.options = options;
173 /**
174 * The cost metric components for this cost snapshot. See
175 * {@link CostMetric}.
176 */
177 this.costMetrics = [];
178 this.stats = stats.clone();
179 this.costMetrics = [...costMetrics];
180 }
181 /** Sum of cost metrics. */
182 total() {
183 return (0, shared_1.sum)(this.costMetrics.map(metric => metric.cost()));
184 }
185 /** A summary of all cost metrics and prices in this cost snapshot. */
186 toString() {
187 let rv = "";
188 this.costMetrics.sort((a, b) => b.cost() - a.cost());
189 const total = this.total();
190 const comments = [];
191 const percent = (entry) => ((entry.cost() / total) * 100).toFixed(1).padStart(5) + "% ";
192 for (const entry of this.costMetrics) {
193 let commentIndex = "";
194 if (entry.comment) {
195 comments.push(entry.comment);
196 commentIndex = ` [${comments.length}]`;
197 }
198 rv += `${entry.describeCostOnly()}${percent(entry)}${commentIndex}\n`;
199 }
200 rv +=
201 "---------------------------------------------------------------------------------------\n";
202 rv += `$${this.total().toFixed(8)}`.padStart(78) + " (USD)\n\n";
203 rv += ` * Estimated using highest pricing tier for each service. Limitations apply.\n`;
204 rv += ` ** Does not account for free tier.\n`;
205 rv += comments.map((c, i) => `[${i + 1}]: ${c}`).join("\n");
206 return rv;
207 }
208 /**
209 * Comma separated value output for a cost snapshot.
210 * @remarks
211 * The format is "metric,unit,pricing,measured,cost,percentage,comment".
212 *
213 * Example output:
214 * ```text
215 * metric,unit,pricing,measured,cost,percentage,comment
216 * functionCallDuration,second,0.00002813,0.60000000,0.00001688,64.1% ,"https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)"
217 * functionCallRequests,request,0.00000020,5,0.00000100,3.8% ,"https://aws.amazon.com/lambda/pricing"
218 * outboundDataTransfer,GB,0.09000000,0.00000844,0.00000076,2.9% ,"https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer"
219 * sqs,request,0.00000040,13,0.00000520,19.7% ,"https://aws.amazon.com/sqs/pricing"
220 * sns,request,0.00000050,5,0.00000250,9.5% ,"https://aws.amazon.com/sns/pricing"
221 * logIngestion,GB,0.50000000,0,0,0.0% ,"https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included."
222 * ```
223 */
224 csv() {
225 let rv = "";
226 rv += "metric,unit,pricing,measured,cost,percentage,comment\n";
227 const total = this.total();
228 const p = (n) => (Number.isInteger(n) ? n : n.toFixed(8));
229 const percent = (entry) => ((entry.cost() / total) * 100).toFixed(1) + "% ";
230 for (const entry of this.costMetrics) {
231 rv += `${entry.name},${entry.unit},${p(entry.pricing)},${p(entry.measured)},${p(entry.cost())},${percent(entry)},"${(entry.comment || "").replace('"', '""')}"\n`;
232 }
233 return rv;
234 }
235 /** @internal */
236 push(metric) {
237 this.costMetrics.push(metric);
238 }
239 /**
240 * Find a specific cost metric by name.
241 * @returns a {@link CostMetric} if found, otherwise `undefined`.
242 */
243 find(name) {
244 return this.costMetrics.find(m => m.name === name);
245 }
246}
247exports.CostSnapshot = CostSnapshot;
248/**
249 * Analyze the cost of a workload across many provider configurations.
250 * @public
251 */
252var CostAnalyzer;
253(function (CostAnalyzer) {
254 /**
255 * Default AWS cost analyzer configurations include all memory sizes for AWS
256 * Lambda.
257 * @remarks
258 * The default AWS cost analyzer configurations include every memory size
259 * from 128MB to 3008MB in 64MB increments. Each configuration has the
260 * following settings:
261 *
262 * ```typescript
263 * {
264 * provider: "aws",
265 * options: {
266 * mode: "https",
267 * memorySize,
268 * timeout: 300,
269 * gc: "off",
270 * childProcess: true
271 * }
272 * }
273 * ```
274 *
275 * Use `Array.map` to change or `Array.filter` to remove some of these
276 * configurations. For example:
277 *
278 * ```typescript
279 * const configsWithAtLeast1GB = awsConfigurations.filter(c => c.memorySize > 1024)
280 * const shorterTimeout = awsConfigurations.map(c => ({...c, timeout: 60 }));
281 * ```
282 * @public
283 */
284 CostAnalyzer.awsConfigurations = (() => {
285 const rv = [];
286 for (let memorySize = 128; memorySize <= 3008; memorySize += 64) {
287 rv.push({
288 provider: "aws",
289 options: {
290 mode: "https",
291 memorySize,
292 timeout: 300,
293 gc: "off",
294 childProcess: true
295 }
296 });
297 }
298 return rv;
299 })();
300 /**
301 * Default Google Cloud Functions cost analyzer configurations include all
302 * available memory sizes.
303 * @remarks
304 * Each google cost analyzer configuration follows this template:
305 *
306 * ```typescript
307 * {
308 * provider: "google",
309 * options: {
310 * mode: "https",
311 * memorySize,
312 * timeout: 300,
313 * gc: "off",
314 * childProcess: true
315 * }
316 * }
317 * ```
318 *
319 * where `memorySize` is in `[128, 256, 512, 1024, 2048]`.
320 * @public
321 */
322 CostAnalyzer.googleConfigurations = (() => {
323 const rv = [];
324 for (const memorySize of [128, 256, 512, 1024, 2048]) {
325 rv.push({
326 provider: "google",
327 options: {
328 mode: "https",
329 memorySize,
330 timeout: 300,
331 gc: "off",
332 childProcess: true
333 }
334 });
335 }
336 return rv;
337 })();
338 const workloadDefaults = {
339 configurations: CostAnalyzer.awsConfigurations,
340 summarize: summarizeMean,
341 format: defaultFormat,
342 formatCSV: defaultFormatCSV,
343 silent: false,
344 repetitions: 10,
345 concurrency: 64
346 };
347 function defaultFormat(attr, value) {
348 return `${attr}:${(0, shared_1.f1)(value)}`;
349 }
350 function defaultFormatCSV(_, value) {
351 return (0, shared_1.f1)(value);
352 }
353 const ps = (n) => (n / 1000).toFixed(3);
354 function summarizeMean(attributes) {
355 const stats = {};
356 attributes.forEach(a => (0, shared_1.keysOf)(a).forEach(attr => {
357 if (!(attr in stats)) {
358 stats[attr] = new shared_1.Statistics();
359 }
360 stats[attr].update(a[attr]);
361 }));
362 const result = {};
363 (0, shared_1.keysOf)(stats).forEach(attr => {
364 result[attr] = stats[attr].mean;
365 });
366 return result;
367 }
368 async function estimate(workload, config) {
369 const { provider, options } = config;
370 const faastModule = await (0, index_1.faast)(provider, workload.funcs, options);
371 const { repetitions, concurrency: repetitionConcurrency } = workload;
372 const doWork = (0, throttle_1.throttle)({ concurrency: repetitionConcurrency }, workload.work);
373 const results = [];
374 for (let i = 0; i < repetitions; i++) {
375 results.push(doWork(faastModule).catch(_ => { }));
376 }
377 const rv = (await Promise.all(results)).filter(r => r);
378 await faastModule.cleanup();
379 const costSnapshot = await faastModule.costSnapshot();
380 const extraMetrics = workload.summarize(rv);
381 return { costSnapshot, config, extraMetrics };
382 }
383 /**
384 * Estimate the cost of a workload using multiple configurations and
385 * providers.
386 * @param userWorkload - a {@link CostAnalyzer.Workload} object specifying
387 * the workload to run and additional parameters.
388 * @returns A promise for a {@link CostAnalyzer.Result}
389 * @public
390 * @remarks
391 * It can be deceptively difficult to set optimal parameters for AWS Lambda
392 * and similar services. On the surface there appears to be only one
393 * parameter: memory size. Choosing more memory also gives more CPU
394 * performance, but it's unclear how much. It's also unclear where single
395 * core performance stops getting better. The workload cost analyzer solves
396 * these problems by making it easy to run cost experiments.
397 * ```text
398 * (AWS)
399 * ┌───────┐
400 * ┌────▶│ 128MB │
401 * │ └───────┘
402 * │ ┌───────┐
403 * ┌─────────────────┐ ├────▶│ 256MB │
404 * ┌──────────────┐ │ │ │ └───────┘
405 * │ workload │───▶│ │ │ ...
406 * └──────────────┘ │ │ │ ┌───────┐
407 * │ cost analyzer │─────┼────▶│3008MB │
408 * ┌──────────────┐ │ │ │ └───────┘
409 * │configurations│───▶│ │ │
410 * └──────────────┘ │ │ │ (Google)
411 * └─────────────────┘ │ ┌───────┐
412 * ├────▶│ 128MB │
413 * │ └───────┘
414 * │ ┌───────┐
415 * └────▶│ 256MB │
416 * └───────┘
417 * ```
418 * `costAnalyzer` is the entry point. It automatically runs this workload
419 * against multiple configurations in parallel. Then it uses faast.js' cost
420 * snapshot mechanism to automatically determine the price of running the
421 * workload with each configuration.
422 *
423 * Example:
424 *
425 * ```typescript
426 * // functions.ts
427 * export function randomNumbers(n: number) {
428 * let sum = 0;
429 * for (let i = 0; i < n; i++) {
430 * sum += Math.random();
431 * }
432 * return sum;
433 * }
434 *
435 * // cost-analyzer-example.ts
436 * import { writeFileSync } from "fs";
437 * import { CostAnalyzer, FaastModule } from "faastjs";
438 * import * as funcs from "./functions";
439 *
440 * async function work(faastModule: FaastModule<typeof funcs>) {
441 * await faastModule.functions.randomNumbers(100000000);
442 * }
443 *
444 * async function main() {
445 * const results = await CostAnalyzer.analyze({ funcs, work });
446 * writeFileSync("cost.csv", results.csv());
447 * }
448 *
449 * main();
450 * ```
451 *
452 * Example output (this is printed to `console.log` unless the
453 * {@link CostAnalyzer.Workload.silent} is `true`):
454 * ```text
455 * ✔ aws 128MB queue 15.385s 0.274σ $0.00003921
456 * ✔ aws 192MB queue 10.024s 0.230σ $0.00003576
457 * ✔ aws 256MB queue 8.077s 0.204σ $0.00003779
458 * ▲ ▲ ▲ ▲ ▲ ▲
459 * │ │ │ │ │ │
460 * provider │ mode │ stdev average
461 * │ │ execution estimated
462 * memory │ time cost
463 * size │
464 * average cloud
465 * execution time
466 * ```
467 *
468 * The output lists the provider, memory size, ({@link CommonOptions.mode}),
469 * average time of a single execution of the workload, the standard
470 * deviation (in seconds) of the execution time, and average estimated cost
471 * for a single run of the workload.
472 *
473 * The "execution time" referenced here is not wall clock time, but rather
474 * execution time in the cloud function. The execution time does not include
475 * any time the workload spends waiting locally. If the workload invokes
476 * multiple cloud functions, their execution times will be summed even if
477 * they happen concurrently. This ensures the execution time and cost are
478 * aligned.
479 */
480 async function analyze(userWorkload) {
481 const scheduleEstimate = (0, throttle_1.throttle)({
482 concurrency: 8,
483 rate: 4,
484 burst: 1,
485 retry: 3
486 }, estimate);
487 const { concurrency = workloadDefaults.concurrency } = userWorkload;
488 const workload = {
489 ...workloadDefaults,
490 ...userWorkload,
491 work: (0, throttle_1.throttle)({ concurrency }, userWorkload.work)
492 };
493 const { configurations } = workload;
494 const promises = configurations.map(config => scheduleEstimate(workload, config));
495 const format = workload.format || defaultFormat;
496 const renderer = workload.silent ? "silent" : "default";
497 const list = new Listr(promises.map((promise, i) => {
498 const { provider, options } = configurations[i];
499 const { memorySize, mode } = options;
500 return {
501 title: `${provider} ${memorySize}MB ${mode}`,
502 task: async (_, task) => {
503 const { costSnapshot, extraMetrics } = await promise;
504 const total = (costSnapshot.total() / workload.repetitions).toFixed(8);
505 const { errors } = costSnapshot.stats;
506 const { executionTime } = costSnapshot.stats;
507 const message = `${ps(executionTime.mean)}s ${ps(executionTime.stdev)}σ $${total}`;
508 const errMessage = errors > 0 ? ` (${errors} errors)` : "";
509 const extra = (0, shared_1.keysOf)(extraMetrics)
510 .map(k => format(k, extraMetrics[k]))
511 .join(" ");
512 task.title = `${task.title} ${message}${errMessage} ${extra}`;
513 }
514 };
515 }), { concurrent: 8, nonTTYRenderer: renderer, renderer });
516 await list.run();
517 const results = await Promise.all(promises);
518 results.sort((a, b) => a.costSnapshot.options.memorySize - b.costSnapshot.options.memorySize);
519 return new Result(workload, results);
520 }
521 CostAnalyzer.analyze = analyze;
522 /**
523 * Cost analyzer results for each workload and configuration.
524 * @remarks
525 * The `estimates` property has the cost estimates for each configuration.
526 * See {@link CostAnalyzer.Estimate}.
527 * @public
528 */
529 class Result {
530 /** @internal */
531 constructor(
532 /** The workload analyzed. */
533 workload,
534 /**
535 * Cost estimates for each configuration of the workload. See
536 * {@link CostAnalyzer.Estimate}.
537 */
538 estimates) {
539 this.workload = workload;
540 this.estimates = estimates;
541 }
542 /**
543 * Comma-separated output of cost analyzer. One line per cost analyzer
544 * configuration.
545 * @remarks
546 * The columns are:
547 *
548 * - `memory`: The memory size allocated.
549 *
550 * - `cloud`: The cloud provider.
551 *
552 * - `mode`: See {@link CommonOptions.mode}.
553 *
554 * - `options`: A string summarizing other faast.js options applied to the
555 * `workload`. See {@link CommonOptions}.
556 *
557 * - `completed`: Number of repetitions that successfully completed.
558 *
559 * - `errors`: Number of invocations that failed.
560 *
561 * - `retries`: Number of retries that were attempted.
562 *
563 * - `cost`: The average cost of executing the workload once.
564 *
565 * - `executionTime`: the aggregate time spent executing on the provider for
566 * all cloud function invocations in the workload. This is averaged across
567 * repetitions.
568 *
569 * - `executionTimeStdev`: The standard deviation of `executionTime`.
570 *
571 * - `billedTime`: the same as `exectionTime`, except rounded up to the next
572 * 100ms for each invocation. Usually very close to `executionTime`.
573 */
574 csv() {
575 const attributes = new Set();
576 this.estimates.forEach(est => (0, shared_1.keysOf)(est.extraMetrics).forEach(key => attributes.add(key)));
577 const columns = [
578 "memory",
579 "cloud",
580 "mode",
581 "options",
582 "completed",
583 "errors",
584 "retries",
585 "cost",
586 "executionTime",
587 "executionTimeStdev",
588 "billedTime",
589 ...attributes
590 ];
591 let rv = columns.join(",") + "\n";
592 this.estimates.forEach(({ costSnapshot, extraMetrics }) => {
593 const { memorySize, mode, ...rest } = costSnapshot.options;
594 const options = `"${(0, util_1.inspect)(rest).replace('"', '""')}"`;
595 const { completed, errors, retries, executionTime, estimatedBilledTime } = costSnapshot.stats;
596 const cost = (costSnapshot.total() / this.workload.repetitions).toFixed(8);
597 const formatter = this.workload.formatCSV || defaultFormatCSV;
598 const metrics = {};
599 for (const attr of attributes) {
600 metrics[attr] = formatter(attr, extraMetrics[attr]);
601 }
602 const row = {
603 memory: memorySize,
604 cloud: costSnapshot.provider,
605 mode,
606 options,
607 completed,
608 errors,
609 retries,
610 cost: `$${cost}`,
611 executionTime: ps(executionTime.mean),
612 executionTimeStdev: ps(executionTime.stdev),
613 billedTime: ps(estimatedBilledTime.mean),
614 ...metrics
615 };
616 rv += (0, shared_1.keysOf)(row)
617 .map(k => String(row[k]))
618 .join(",");
619 rv += "\n";
620 });
621 return rv;
622 }
623 }
624 CostAnalyzer.Result = Result;
625})(CostAnalyzer = exports.CostAnalyzer || (exports.CostAnalyzer = {}));
626//# 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* as Listr from \"listr\";\nimport { inspect } from \"util\";\nimport { faast, FaastModule } from \"../index\";\nimport { AwsOptions } from \"./aws/aws-faast\";\nimport { GoogleOptions } from \"./google/google-faast\";\nimport { FunctionStats, CommonOptions } from \"./provider\";\nimport { f1, keysOf, Statistics, sum } from \"./shared\";\nimport { throttle } from \"./throttle\";\nimport { PropertiesExcept, AnyFunction } from \"./types\";\n\n/**\n * A line item in the cost estimate, including the resource usage metric\n * measured and its pricing.\n * @public\n */\nexport class CostMetric {\n    /** The name of the cost metric, e.g. `functionCallDuration` */\n    readonly name: string;\n    /** The price in USD per unit measured. */\n    readonly pricing: number;\n    /** The name of the units that pricing is measured in for this metric. */\n    readonly unit: string;\n    /** The measured value of the cost metric, in units. */\n    readonly measured: number;\n    /**\n     * The plural form of the unit name. By default the plural form will be the\n     * name of the unit with \"s\" appended at the end, unless the last letter is\n     * capitalized, in which case there is no plural form (e.g. \"GB\").\n     */\n    readonly unitPlural?: string;\n    /**\n     * An optional comment, usually providing a link to the provider's pricing\n     * page and other data.\n     */\n    readonly comment?: string;\n    /**\n     * True if this cost metric is only for informational purposes (e.g. AWS's\n     * `logIngestion`) and does not contribute cost.\n     */\n    readonly informationalOnly?: boolean;\n\n    /** @internal */\n    constructor(arg: PropertiesExcept<CostMetric, AnyFunction>) {\n        this.name = arg.name;\n        this.pricing = arg.pricing;\n        this.unit = arg.unit;\n        this.measured = arg.measured;\n        this.unitPlural = arg.unitPlural;\n        this.comment = arg.comment;\n        this.informationalOnly = arg.informationalOnly;\n    }\n\n    /**\n     * The cost contribution of this cost metric. Equal to\n     * {@link CostMetric.pricing} * {@link CostMetric.measured}.\n     */\n    cost() {\n        return this.pricing * this.measured;\n    }\n\n    /**\n     * Return a string with the cost estimate for this metric, omitting\n     * comments.\n     */\n    describeCostOnly() {\n        const p = (n: number, precision = 8) =>\n            Number.isInteger(n) ? String(n) : n.toFixed(precision);\n        const getUnit = (n: number) => {\n            if (n > 1) {\n                return (\n                    this.unitPlural ||\n                    (!this.unit.match(/[A-Z]$/) ? this.unit + \"s\" : this.unit)\n                );\n            } else {\n                return this.unit;\n            }\n        };\n\n        const cost = `$${p(this.cost())}`;\n        const pricing = `$${p(this.pricing)}/${this.unit}`;\n        const metric = p(this.measured, this.unit === \"second\" ? 1 : 8);\n        const unit = getUnit(this.measured);\n\n        return `${this.name.padEnd(21)} ${pricing.padEnd(20)} ${metric.padStart(\n            12\n        )} ${unit.padEnd(10)} ${cost.padEnd(14)}`;\n    }\n\n    /** Describe this cost metric, including comments. */\n    toString() {\n        return `${this.describeCostOnly()}${\n            (this.comment && `// ${this.comment}`) || \"\"\n        }`;\n    }\n}\n\n/**\n * A summary of the costs incurred by a faast.js module at a point in time.\n * Output of {@link FaastModule.costSnapshot}.\n * @remarks\n * Cost information provided by faast.js is an estimate. It is derived from\n * internal faast.js measurements and not by consulting data provided by your\n * cloud provider.\n *\n * **Faast.js does not guarantee the accuracy of cost estimates.**\n *\n * **Use at your own risk.**\n *\n * Example using AWS:\n * ```typescript\n * const faastModule = await faast(\"aws\", m);\n * try {\n *     // Invoke faastModule.functions.*\n * } finally {\n *     await faastModule.cleanup();\n *     console.log(`Cost estimate:`);\n *     console.log(`${await faastModule.costSnapshot()}`);\n * }\n * ```\n *\n * AWS example output:\n * ```text\n * Cost estimate:\n * functionCallDuration  $0.00002813/second            0.6 second     $0.00001688    68.4%  [1]\n * sqs                   $0.00000040/request             9 requests   $0.00000360    14.6%  [2]\n * sns                   $0.00000050/request             5 requests   $0.00000250    10.1%  [3]\n * functionCallRequests  $0.00000020/request             5 requests   $0.00000100     4.1%  [4]\n * outboundDataTransfer  $0.09000000/GB         0.00000769 GB         $0.00000069     2.8%  [5]\n * logIngestion          $0.50000000/GB                  0 GB         $0              0.0%  [6]\n * ---------------------------------------------------------------------------------------\n *                                                                    $0.00002467 (USD)\n *\n *   * Estimated using highest pricing tier for each service. Limitations apply.\n *  ** Does not account for free tier.\n * [1]: https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)\n * [2]: https://aws.amazon.com/sqs/pricing\n * [3]: https://aws.amazon.com/sns/pricing\n * [4]: https://aws.amazon.com/lambda/pricing\n * [5]: https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer\n * [6]: https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included.\n * ```\n *\n * A cost snapshot contains several {@link CostMetric} values. Each `CostMetric`\n * summarizes one component of the overall cost of executing the functions so\n * far. Some cost metrics are common to all faast providers, and other metrics\n * are provider-specific. The common metrics are:\n *\n * - `functionCallDuration`: the estimated billed CPU time (rounded to the next\n *   100ms) consumed by completed cloud function calls. This is the metric that\n *   usually dominates cost.\n *\n * - `functionCallRequests`: the number of invocation requests made. Most\n *   providers charge for each invocation.\n *\n * Provider-specific metrics vary. For example, AWS has the following additional\n * metrics:\n *\n * - `sqs`: AWS Simple Queueing Service. This metric captures the number of\n *   queue requests made to insert and retrieve queued results (each 64kb chunk\n *   is counted as an additional request). SQS is used even if\n *   {@link CommonOptions.mode} is not set to `\"queue\"`, because it is necessary\n *   for monitoring cloud function invocations.\n *\n * - `sns`: AWS Simple Notification Service. SNS is used to invoke Lambda\n *   functions when {@link CommonOptions.mode} is `\"queue\"`.\n *\n * - `outboundDataTransfer`: an estimate of the network data transferred out\n *   from the cloud provider for this faast.js module. This estimate only counts\n *   data returned from cloud function invocations and infrastructure that\n *   faast.js sets up. It does not count any outbound data sent by your cloud\n *   functions that are not known to faast.js. Note that if you run faast.js on\n *   EC2 in the same region (see {@link AwsOptions.region}), then the data\n *   transfer costs will be zero (however, the cost snapshot will not include\n *   EC2 costs). Also note that if your cloud function transfers data from/to S3\n *   buckets in the same region, there is no cost as long as that data is not\n *   returned from the function.\n *\n * - `logIngestion`: this cost metric is always zero for AWS. It is present to\n *   remind the user that AWS charges for log data ingested by CloudWatch Logs\n *   that are not measured by faast.js. Log entries may arrive significantly\n *   after function execution completes, and there is no way for faast.js to\n *   know exactly how long to wait, therefore it does not attempt to measure\n *   this cost. In practice, if your cloud functions do not perform extensive\n *   logging on all invocations, log ingestion costs from faast.js are likely to\n *   be low or fall within the free tier.\n *\n * For Google, extra metrics include `outboundDataTransfer` similar to AWS, and\n * `pubsub`, which combines costs that are split into `sns` and `sqs` on AWS.\n *\n * The Local provider has no extra metrics.\n *\n * Prices are retrieved dynamically from AWS and Google and cached locally.\n * Cached prices expire after 24h. For each cost metric, faast.js uses the\n * highest price tier to compute estimated pricing.\n *\n * Cost estimates do not take free tiers into account.\n * @public\n */\nexport class CostSnapshot {\n    /** The function statistics that were used to compute prices. */\n    readonly stats: FunctionStats;\n    /**\n     * The cost metric components for this cost snapshot. See\n     * {@link CostMetric}.\n     */\n    readonly costMetrics: CostMetric[] = [];\n    /** @internal */\n    constructor(\n        /** The {@link Provider}, e.g. \"aws\" or \"google\" */\n        readonly provider: string,\n        /**\n         * The options used to initialize the faast.js module where this cost\n         * snapshot was generated.\n         */\n        readonly options: CommonOptions | AwsOptions | GoogleOptions,\n        stats: FunctionStats,\n        costMetrics: CostMetric[] = []\n    ) {\n        this.stats = stats.clone();\n        this.costMetrics = [...costMetrics];\n    }\n\n    /** Sum of cost metrics. */\n    total() {\n        return sum(this.costMetrics.map(metric => metric.cost()));\n    }\n\n    /** A summary of all cost metrics and prices in this cost snapshot. */\n    toString() {\n        let rv = \"\";\n        this.costMetrics.sort((a, b) => b.cost() - a.cost());\n        const total = this.total();\n        const comments = [];\n        const percent = (entry: CostMetric) =>\n            ((entry.cost() / total) * 100).toFixed(1).padStart(5) + \"% \";\n        for (const entry of this.costMetrics) {\n            let commentIndex = \"\";\n            if (entry.comment) {\n                comments.push(entry.comment);\n                commentIndex = ` [${comments.length}]`;\n            }\n            rv += `${entry.describeCostOnly()}${percent(entry)}${commentIndex}\\n`;\n        }\n        rv +=\n            \"---------------------------------------------------------------------------------------\\n\";\n        rv += `$${this.total().toFixed(8)}`.padStart(78) + \" (USD)\\n\\n\";\n        rv += `  * Estimated using highest pricing tier for each service. Limitations apply.\\n`;\n        rv += ` ** Does not account for free tier.\\n`;\n        rv += comments.map((c, i) => `[${i + 1}]: ${c}`).join(\"\\n\");\n        return rv;\n    }\n\n    /**\n     * Comma separated value output for a cost snapshot.\n     * @remarks\n     * The format is \"metric,unit,pricing,measured,cost,percentage,comment\".\n     *\n     * Example output:\n     * ```text\n     * metric,unit,pricing,measured,cost,percentage,comment\n     * functionCallDuration,second,0.00002813,0.60000000,0.00001688,64.1% ,\"https://aws.amazon.com/lambda/pricing (rate = 0.00001667/(GB*second) * 1.6875 GB = 0.00002813/second)\"\n     * functionCallRequests,request,0.00000020,5,0.00000100,3.8% ,\"https://aws.amazon.com/lambda/pricing\"\n     * outboundDataTransfer,GB,0.09000000,0.00000844,0.00000076,2.9% ,\"https://aws.amazon.com/ec2/pricing/on-demand/#Data_Transfer\"\n     * sqs,request,0.00000040,13,0.00000520,19.7% ,\"https://aws.amazon.com/sqs/pricing\"\n     * sns,request,0.00000050,5,0.00000250,9.5% ,\"https://aws.amazon.com/sns/pricing\"\n     * logIngestion,GB,0.50000000,0,0,0.0% ,\"https://aws.amazon.com/cloudwatch/pricing/ - Log ingestion costs not currently included.\"\n     * ```\n     */\n    csv() {\n        let rv = \"\";\n        rv += \"metric,unit,pricing,measured,cost,percentage,comment\\n\";\n        const total = this.total();\n        const p = (n: number) => (Number.isInteger(n) ? n : n.toFixed(8));\n        const percent = (entry: CostMetric) =>\n            ((entry.cost() / total) * 100).toFixed(1) + \"% \";\n        for (const entry of this.costMetrics) {\n            rv += `${entry.name},${entry.unit},${p(entry.pricing)},${p(\n                entry.measured\n            )},${p(entry.cost())},${percent(entry)},\"${(entry.comment || \"\").replace(\n                '\"',\n                '\"\"'\n            )}\"\\n`;\n        }\n        return rv;\n    }\n\n    /** @internal */\n    push(metric: CostMetric) {\n        this.costMetrics.push(metric);\n    }\n\n    /**\n     * Find a specific cost metric by name.\n     * @returns a {@link CostMetric} if found, otherwise `undefined`.\n     */\n    find(name: string) {\n        return this.costMetrics.find(m => m.name === name);\n    }\n}\n\n/**\n * Analyze the cost of a workload across many provider configurations.\n * @public\n */\nexport namespace CostAnalyzer {\n    /**\n     * An input to {@link CostAnalyzer.analyze}, specifying one\n     * configuration of faast.js to run against a workload. See\n     * {@link AwsOptions} and {@link GoogleOptions}.\n     * @public\n     */\n    export type Configuration =\n        | {\n              provider: \"aws\";\n              options: AwsOptions;\n          }\n        | {\n              provider: \"google\";\n              options: GoogleOptions;\n          };\n\n    /**\n     * Default AWS cost analyzer configurations include all memory sizes for AWS\n     * Lambda.\n     * @remarks\n     * The default AWS cost analyzer configurations include every memory size\n     * from 128MB to 3008MB in 64MB increments. Each configuration has the\n     * following settings:\n     *\n     * ```typescript\n     * {\n     *     provider: \"aws\",\n     *     options: {\n     *         mode: \"https\",\n     *         memorySize,\n     *         timeout: 300,\n     *         gc: \"off\",\n     *         childProcess: true\n     *     }\n     * }\n     * ```\n     *\n     * Use `Array.map` to change or `Array.filter` to remove some of these\n     * configurations. For example:\n     *\n     * ```typescript\n     * const configsWithAtLeast1GB = awsConfigurations.filter(c => c.memorySize > 1024)\n     * const shorterTimeout = awsConfigurations.map(c => ({...c, timeout: 60 }));\n     * ```\n     * @public\n     */\n    export const awsConfigurations: Configuration[] = (() => {\n        const rv: Configuration[] = [];\n        for (let memorySize = 128; memorySize <= 3008; memorySize += 64) {\n            rv.push({\n                provider: \"aws\",\n                options: {\n                    mode: \"https\",\n                    memorySize,\n                    timeout: 300,\n                    gc: \"off\",\n                    childProcess: true\n                }\n            });\n        }\n        return rv;\n    })();\n\n    /**\n     * Default Google Cloud Functions cost analyzer configurations include all\n     * available memory sizes.\n     * @remarks\n     * Each google cost analyzer configuration follows this template:\n     *\n     * ```typescript\n     * {\n     *     provider: \"google\",\n     *     options: {\n     *         mode: \"https\",\n     *         memorySize,\n     *         timeout: 300,\n     *         gc: \"off\",\n     *         childProcess: true\n     *     }\n     * }\n     * ```\n     *\n     * where `memorySize` is in `[128, 256, 512, 1024, 2048]`.\n     * @public\n     */\n    export const googleConfigurations: Configuration[] = (() => {\n        const rv: Configuration[] = [];\n        for (const memorySize of [128, 256, 512, 1024, 2048]) {\n            rv.push({\n                provider: \"google\",\n                options: {\n                    mode: \"https\",\n                    memorySize,\n                    timeout: 300,\n                    gc: \"off\",\n                    childProcess: true\n                }\n            });\n        }\n        return rv;\n    })();\n\n    /**\n     * User-defined custom metrics for a workload. These are automatically\n     * summarized in the output; see {@link CostAnalyzer.Workload}.\n     * @public\n     */\n    export type WorkloadAttribute<A extends string> = { [attr in A]: number };\n\n    /**\n     * A user-defined cost analyzer workload for {@link CostAnalyzer.analyze}.\n     * @public\n     * Example:\n     */\n    export interface Workload<T extends object, A extends string> {\n        /**\n         * The imported module that contains the cloud functions to test.\n         */\n        funcs: T;\n        /**\n         * A function that executes cloud functions on\n         * `faastModule.functions.*`. The work function should return `void` if\n         * there are no custom workload attributes. Otherwise, it should return\n         * a {@link CostAnalyzer.WorkloadAttribute} object which maps\n         * user-defined attribute names to numerical values for the workload.\n         * For example, this might measure bandwidth or some other metric not\n         * tracked by faast.js, but are relevant for evaluating the\n         * cost-performance tradeoff of the configurations analyzed by the cost\n         * analyzer.\n         */\n        work: (faastModule: FaastModule<T>) => Promise<WorkloadAttribute<A> | void>;\n        /**\n         * An array of configurations to run the work function against (see\n         * {@link CostAnalyzer.Configuration}). For example, each entry in the\n         * array may specify a provider, memory size, and other options.\n         * Default: {@link CostAnalyzer.awsConfigurations}.\n         */\n        configurations?: Configuration[];\n        /**\n         * Combine {@link CostAnalyzer.WorkloadAttribute} instances returned\n         * from multiple workload executions (caused by value of\n         * {@link CostAnalyzer.Workload.repetitions}). The default is a function\n         * that takes the average of each attribute.\n         */\n        summarize?: (summaries: WorkloadAttribute<A>[]) => WorkloadAttribute<A>;\n        /**\n         * Format an attribute value for console output. This is displayed by\n         * the cost analyzer when all of the repetitions for a configuration\n         * have completed. The default returns\n         * `${attribute}:${value.toFixed(1)}`.\n         */\n        format?: (attr: A, value: number) => string;\n        /**\n         * Format an attribute value for CSV. The default returns\n         * `value.toFixed(1)`.\n         */\n        formatCSV?: (attr: A, value: number) => string;\n        /**\n         * If true, do not output live results to the console. Can be useful for\n         * running the cost analyzer as part of automated tests. Default: false.\n         */\n        silent?: boolean;\n        /**\n         * The number of repetitions to run the workload for each cost analyzer\n         * configuration. Higher repetitions help reduce the jitter in the\n         * results. Repetitions execute in the same FaastModule instance.\n         * Default: 10.\n         */\n        repetitions?: number;\n        /**\n         * The amount of concurrency to allow. Concurrency can arise from\n         * multiple repetitions of the same configuration, or concurrenct\n         * executions of different configurations. This concurrency limit\n         * throttles the total number of concurrent workload executions across\n         * both of these sources of concurrency. Default: 64.\n         */\n        concurrency?: number;\n    }\n\n    const workloadDefaults = {\n        configurations: awsConfigurations,\n        summarize: summarizeMean,\n        format: defaultFormat,\n        formatCSV: defaultFormatCSV,\n        silent: false,\n        repetitions: 10,\n        concurrency: 64\n    };\n\n    function defaultFormat(attr: string, value: number) {\n        return `${attr}:${f1(value)}`;\n    }\n\n    function defaultFormatCSV(_: string, value: number) {\n        return f1(value);\n    }\n\n    const ps = (n: number) => (n / 1000).toFixed(3);\n\n    function summarizeMean<A extends string>(attributes: WorkloadAttribute<A>[]) {\n        const stats: { [attr: string]: Statistics } = {};\n        attributes.forEach(a =>\n            keysOf(a).forEach(attr => {\n                if (!(attr in stats)) {\n                    stats[attr] = new Statistics();\n                }\n                stats[attr].update(a[attr]);\n            })\n        );\n        const result = {} as any;\n        keysOf(stats).forEach(attr => {\n            result[attr] = stats[attr].mean;\n        });\n        return result;\n    }\n\n    /**\n     * A cost estimate result for a specific cost analyzer configuration.\n     * @public\n     */\n    export interface Estimate<A extends string> {\n        /**\n         * The cost snapshot for the cost analysis of the specific (workload,\n         * configuration) combination. See {@link CostSnapshot}.\n         */\n        costSnapshot: CostSnapshot;\n        /**\n         * The worload configuration that was analyzed. See\n         * {@link CostAnalyzer.Configuration}.\n         */\n        config: Configuration;\n        /**\n         * Additional workload metrics returned from the work function. See\n         * {@link CostAnalyzer.WorkloadAttribute}.\n         */\n        extraMetrics: WorkloadAttribute<A>;\n    }\n\n    async function estimate<T extends object, K extends string>(\n        workload: Required<Workload<T, K>>,\n        config: Configuration\n    ): Promise<Estimate<K>> {\n        const { provider, options } = config;\n        const faastModule = await faast(provider, workload.funcs, options);\n        const { repetitions, concurrency: repetitionConcurrency } = workload;\n        const doWork = throttle({ concurrency: repetitionConcurrency }, workload.work);\n        const results: Promise<WorkloadAttribute<K> | void>[] = [];\n        for (let i = 0; i < repetitions; i++) {\n            results.push(doWork(faastModule).catch(_ => {}));\n        }\n        const rv = (await Promise.all(results)).filter(r => r) as WorkloadAttribute<K>[];\n        await faastModule.cleanup();\n        const costSnapshot = await faastModule.costSnapshot();\n        const extraMetrics = workload.summarize(rv);\n        return { costSnapshot, config, extraMetrics };\n    }\n\n    /**\n     * Estimate the cost of a workload using multiple configurations and\n     * providers.\n     * @param userWorkload - a {@link CostAnalyzer.Workload} object specifying\n     * the workload to run and additional parameters.\n     * @returns A promise for a {@link CostAnalyzer.Result}\n     * @public\n     * @remarks\n     * It can be deceptively difficult to set optimal parameters for AWS Lambda\n     * and similar services. On the surface there appears to be only one\n     * parameter: memory size. Choosing more memory also gives more CPU\n     * performance, but it's unclear how much. It's also unclear where single\n     * core performance stops getting better. The workload cost analyzer solves\n     * these problems by making it easy to run cost experiments.\n     * ```text\n     *                                                      (AWS)\n     *                                                    ┌───────┐\n     *                                              ┌────▶│ 128MB │\n     *                                              │     └───────┘\n     *                                              │     ┌───────┐\n     *                      ┌─────────────────┐     ├────▶│ 256MB │\n     *  ┌──────────────┐    │                 │     │     └───────┘\n     *  │   workload   │───▶│                 │     │        ...\n     *  └──────────────┘    │                 │     │     ┌───────┐\n     *                      │  cost analyzer  │─────┼────▶│3008MB │\n     *  ┌──────────────┐    │                 │     │     └───────┘\n     *  │configurations│───▶│                 │     │\n     *  └──────────────┘    │                 │     │     (Google)\n     *                      └─────────────────┘     │     ┌───────┐\n     *                                              ├────▶│ 128MB │\n     *                                              │     └───────┘\n     *                                              │     ┌───────┐\n     *                                              └────▶│ 256MB │\n     *                                                    └───────┘\n     * ```\n     * `costAnalyzer` is the entry point. It automatically runs this workload\n     * against multiple configurations in parallel. Then it uses faast.js' cost\n     * snapshot mechanism to automatically determine the price of running the\n     * workload with each configuration.\n     *\n     * Example:\n     *\n     * ```typescript\n     * // functions.ts\n     * export function randomNumbers(n: number) {\n     *     let sum = 0;\n     *     for (let i = 0; i < n; i++) {\n     *         sum += Math.random();\n     *     }\n     *     return sum;\n     * }\n     *\n     * // cost-analyzer-example.ts\n     * import { writeFileSync } from \"fs\";\n     * import { CostAnalyzer, FaastModule } from \"faastjs\";\n     * import * as funcs from \"./functions\";\n     *\n     * async function work(faastModule: FaastModule<typeof funcs>) {\n     *     await faastModule.functions.randomNumbers(100000000);\n     * }\n     *\n     * async function main() {\n     *     const results = await CostAnalyzer.analyze({ funcs, work });\n     *     writeFileSync(\"cost.csv\", results.csv());\n     * }\n     *\n     * main();\n     * ```\n     *\n     * Example output (this is printed to `console.log` unless the\n     * {@link CostAnalyzer.Workload.silent} is `true`):\n     * ```text\n     *   ✔ aws 128MB queue 15.385s 0.274σ $0.00003921\n     *   ✔ aws 192MB queue 10.024s 0.230σ $0.00003576\n     *   ✔ aws 256MB queue 8.077s 0.204σ $0.00003779\n     *      ▲    ▲     ▲     ▲       ▲        ▲\n     *      │    │     │     │       │        │\n     *  provider │    mode   │     stdev     average\n     *           │           │   execution  estimated\n     *         memory        │     time       cost\n     *          size         │\n     *                 average cloud\n     *                 execution time\n     * ```\n     *\n     * The output lists the provider, memory size, ({@link CommonOptions.mode}),\n     * average time of a single execution of the workload, the standard\n     * deviation (in seconds) of the execution time, and average estimated cost\n     * for a single run of the workload.\n     *\n     * The \"execution time\" referenced here is not wall clock time, but rather\n     * execution time in the cloud function. The execution time does not include\n     * any time the workload spends waiting locally. If the workload invokes\n     * multiple cloud functions, their execution times will be summed even if\n     * they happen concurrently. This ensures the execution time and cost are\n     * aligned.\n     */\n    export async function analyze<T extends object, A extends string>(\n        userWorkload: Workload<T, A>\n    ) {\n        const scheduleEstimate = throttle<\n            [Required<Workload<T, A>>, Configuration],\n            Estimate<A>\n        >(\n            {\n                concurrency: 8,\n                rate: 4,\n                burst: 1,\n                retry: 3\n            },\n            estimate\n        );\n\n        const { concurrency = workloadDefaults.concurrency } = userWorkload;\n        const workload: Required<Workload<T, A>> = {\n            ...workloadDefaults,\n            ...userWorkload,\n            work: throttle({ concurrency }, userWorkload.work)\n        };\n\n        const { configurations } = workload;\n        const promises = configurations.map(config => scheduleEstimate(workload, config));\n\n        const format = workload.format || defaultFormat;\n\n        const renderer = workload.silent ? \"silent\" : \"default\";\n\n        const list = new Listr(\n            promises.map((promise, i) => {\n                const { provider, options } = configurations[i];\n                const { memorySize, mode } = options;\n\n                return {\n                    title: `${provider} ${memorySize}MB ${mode}`,\n                    task: async (_: any, task: Listr.ListrTaskWrapper) => {\n                        const { costSnapshot, extraMetrics } = await promise;\n                        const total = (\n                            costSnapshot.total() / workload.repetitions\n                        ).toFixed(8);\n                        const { errors } = costSnapshot.stats;\n                        const { executionTime } = costSnapshot.stats;\n                        const message = `${ps(executionTime.mean)}s ${ps(\n                            executionTime.stdev\n                        )}σ $${total}`;\n                        const errMessage = errors > 0 ? ` (${errors} errors)` : \"\";\n                        const extra = keysOf(extraMetrics)\n                            .map(k => format(k, extraMetrics[k]))\n                            .join(\" \");\n                        task.title = `${task.title} ${message}${errMessage} ${extra}`;\n                    }\n                };\n            }),\n            { concurrent: 8, nonTTYRenderer: renderer, renderer }\n        );\n\n        await list.run();\n        const results = await Promise.all(promises);\n        results.sort(\n            (a, b) =>\n                a.costSnapshot.options.memorySize! - b.costSnapshot.options.memorySize!\n        );\n        return new Result(workload, results);\n    }\n\n    /**\n     * Cost analyzer results for each workload and configuration.\n     * @remarks\n     * The `estimates` property has the cost estimates for each configuration.\n     * See {@link CostAnalyzer.Estimate}.\n     * @public\n     */\n    export class Result<T extends object, A extends string> {\n        /** @internal */\n        constructor(\n            /** The workload analyzed. */\n            readonly workload: Required<Workload<T, A>>,\n            /**\n             * Cost estimates for each configuration of the workload. See\n             * {@link CostAnalyzer.Estimate}.\n             */\n            readonly estimates: Estimate<A>[]\n        ) {}\n\n        /**\n         * Comma-separated output of cost analyzer. One line per cost analyzer\n         * configuration.\n         * @remarks\n         * The columns are:\n         *\n         * - `memory`: The memory size allocated.\n         *\n         * - `cloud`: The cloud provider.\n         *\n         * - `mode`: See {@link CommonOptions.mode}.\n         *\n         * - `options`: A string summarizing other faast.js options applied to the\n         *   `workload`. See {@link CommonOptions}.\n         *\n         * - `completed`: Number of repetitions that successfully completed.\n         *\n         * - `errors`: Number of invocations that failed.\n         *\n         * - `retries`: Number of retries that were attempted.\n         *\n         * - `cost`: The average cost of executing the workload once.\n         *\n         * - `executionTime`: the aggregate time spent executing on the provider for\n         *   all cloud function invocations in the workload. This is averaged across\n         *   repetitions.\n         *\n         * - `executionTimeStdev`: The standard deviation of `executionTime`.\n         *\n         * - `billedTime`: the same as `exectionTime`, except rounded up to the next\n         *   100ms for each invocation. Usually very close to `executionTime`.\n         */\n        csv() {\n            const attributes = new Set<A>();\n            this.estimates.forEach(est =>\n                keysOf(est.extraMetrics).forEach(key => attributes.add(key))\n            );\n            const columns = [\n                \"memory\",\n                \"cloud\",\n                \"mode\",\n                \"options\",\n                \"completed\",\n                \"errors\",\n                \"retries\",\n                \"cost\",\n                \"executionTime\",\n                \"executionTimeStdev\",\n                \"billedTime\",\n                ...attributes\n            ];\n            let rv = columns.join(\",\") + \"\\n\";\n\n            this.estimates.forEach(({ costSnapshot, extraMetrics }) => {\n                const { memorySize, mode, ...rest } = costSnapshot.options;\n                const options = `\"${inspect(rest).replace('\"', '\"\"')}\"`;\n                const { completed, errors, retries, executionTime, estimatedBilledTime } =\n                    costSnapshot.stats;\n                const cost = (costSnapshot.total() / this.workload.repetitions).toFixed(\n                    8\n                );\n                const formatter = this.workload.formatCSV || defaultFormatCSV;\n\n                const metrics: { [attr in string]: string } = {};\n                for (const attr of attributes) {\n                    metrics[attr] = formatter(attr, extraMetrics[attr]);\n                }\n                const row = {\n                    memory: memorySize,\n                    cloud: costSnapshot.provider,\n                    mode,\n                    options,\n                    completed,\n                    errors,\n                    retries,\n                    cost: `$${cost}`,\n                    executionTime: ps(executionTime.mean),\n                    executionTimeStdev: ps(executionTime.stdev),\n                    billedTime: ps(estimatedBilledTime.mean),\n                    ...metrics\n                };\n\n                rv += keysOf(row)\n                    .map(k => String(row[k]))\n                    .join(\",\");\n                rv += \"\\n\";\n            });\n            return rv;\n        }\n    }\n}\n"]}
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