faastjs
Version:
Serverless batch computing made simple.
291 lines • 32.1 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SmallestN = exports.MaxHeap = exports.defined = exports.keysOf = exports.f2 = exports.f1 = exports.KB = exports.MB = exports.GB = exports.uuidv4Pattern = exports.roundTo100ms = exports.hasExpired = exports.computeHttpResponseBytes = exports.objectSize = exports.sum = exports.chomp = exports.streamToBuffer = exports.sleep = exports.ExponentiallyDecayingAverageValue = exports.Statistics = void 0;
/**
* Incrementally updated statistics on a set of values.
* @public
*/
class Statistics {
/**
* Incrementally track mean, stdev, min, max, of a sequence of values.
* @param printFixedPrecision - The number of decimal places to print in
* {@link Statistics.toString}.
*/
constructor(
/** The number of decimal places to print in {@link Statistics.toString} */
printFixedPrecision = 1) {
this.printFixedPrecision = printFixedPrecision;
/** Number of values observed. */
this.samples = 0;
/** The maximum value observed. Initialized to `Number.NEGATIVE_INFINITY`. */
this.max = Number.NEGATIVE_INFINITY;
/** The minimum value observed. Initialized to `Number.POSITIVE_INFINITY`. */
this.min = Number.POSITIVE_INFINITY;
/** The variance of the values observed. */
this.variance = 0;
/** The standard deviation of the values observed. */
this.stdev = 0;
/** The mean (average) of the values observed. */
this.mean = NaN;
}
/** @internal */
clone() {
const rv = new Statistics(this.printFixedPrecision);
return Object.assign(rv, this);
}
/**
* Update statistics with a new value in the sequence.
*/
update(value) {
if (value === undefined) {
return;
}
let previousMean = this.mean;
// https://math.stackexchange.com/questions/374881/recursive-formula-for-variance
let previousVariance = this.variance;
if (this.samples === 0) {
previousMean = 0;
previousVariance = 0;
}
this.samples++;
this.mean = previousMean + (value - previousMean) / this.samples;
this.variance =
((previousVariance + (previousMean - value) ** 2 / this.samples) *
(this.samples - 1)) /
this.samples;
this.stdev = Math.sqrt(this.variance);
if (value > this.max) {
this.max = value;
}
if (value < this.min) {
this.min = value;
}
}
/**
* Print the mean of the observations seen, with the precision specified in
* the constructor.
*/
toString() {
return `${this.mean.toFixed(this.printFixedPrecision)}`;
}
}
exports.Statistics = Statistics;
class ExponentiallyDecayingAverageValue {
constructor(smoothingFactor) {
this.smoothingFactor = smoothingFactor;
this.samples = 0;
this.value = 0;
}
update(n) {
// tslint:disable-next-line:prefer-conditional-expression
if (this.samples++ === 0) {
this.value = n;
}
else {
this.value =
this.smoothingFactor * n + (1 - this.smoothingFactor) * this.value;
}
}
toString() {
return this.value;
}
}
exports.ExponentiallyDecayingAverageValue = ExponentiallyDecayingAverageValue;
function sleep(ms, cancel = new Promise(() => { })) {
let id;
cancel.then(_ => clearTimeout(id)).catch(_ => clearTimeout(id));
return Promise.race([new Promise(resolve => (id = setTimeout(resolve, ms))), cancel]);
}
exports.sleep = sleep;
function streamToBuffer(s) {
return new Promise((resolve, reject) => {
const buffers = [];
s.on("error", reject);
s.on("data", (data) => buffers.push(data));
s.on("end", () => resolve(Buffer.concat(buffers)));
});
}
exports.streamToBuffer = streamToBuffer;
function chomp(s) {
if (s.length > 0 && s[s.length - 1] === "\n") {
s = s.slice(0, s.length - 1);
}
return s;
}
exports.chomp = chomp;
const sum = (a) => a.reduce((total, n) => total + n, 0);
exports.sum = sum;
function objectSize(obj) {
if (!obj) {
return 0;
}
return (0, exports.sum)(Object.keys(obj).map(key => key.length + obj[key].length));
}
exports.objectSize = objectSize;
function computeHttpResponseBytes(headers, opts = { httpHeaders: true, min: 0 }) {
const headerKeys = Object.keys(headers);
let contentLength = 0;
for (const key of headerKeys) {
if (key.match(/^content-length$/i)) {
contentLength = Number(headers[key]);
break;
}
}
if (!opts.httpHeaders) {
return Math.max(contentLength, opts.min);
}
const headerLength = objectSize(headers) + headerKeys.length * ": ".length;
const otherLength = 13;
return Math.max(contentLength + headerLength + otherLength, opts.min);
}
exports.computeHttpResponseBytes = computeHttpResponseBytes;
function hasExpired(date, retentionInDays) {
if (retentionInDays <= 0) {
return true;
}
const timestamp = typeof date === "string" ? Date.parse(date) : date || 0;
return timestamp < Date.now() - retentionInDays * 24 * 60 * 60 * 1000;
}
exports.hasExpired = hasExpired;
function roundTo100ms(n) {
return Math.round(n / 100) * 100;
}
exports.roundTo100ms = roundTo100ms;
exports.uuidv4Pattern = "[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}";
exports.GB = 2 ** 30;
exports.MB = 2 ** 20;
exports.KB = 2 ** 10;
function f1(n) {
return n.toFixed(1);
}
exports.f1 = f1;
function f2(n) {
return n.toFixed(2);
}
exports.f2 = f2;
function keysOf(obj) {
return Object.keys(obj);
}
exports.keysOf = keysOf;
function defined(arg) {
return !!arg;
}
exports.defined = defined;
class MaxHeap {
constructor() {
this._heap = [];
}
get size() {
return this._heap.length;
}
clear() {
this._heap = [];
}
peekMax() {
return this._heap[0];
}
insert(value) {
const h = this._heap;
h.push(value);
let i = h.length - 1;
const parentOf = (n) => Math.floor((n - 1) / 2);
let parent = parentOf(i);
while (parent >= 0 && h[i] > h[parent]) {
const tmp = h[parent];
h[parent] = h[i];
h[i] = tmp;
i = parent;
parent = parentOf(i);
}
}
extractMax() {
const h = this._heap;
if (h.length === 0) {
throw new Error("extractMax called on empty heap");
}
let i = 0;
const rv = h[0];
h[0] = h[h.length - 1];
h.pop();
while (i < h.length) {
const [left, right] = [i * 2 + 1, i * 2 + 2];
let maybe;
if (h[i] < h[left] && !(h[right] > h[left])) {
maybe = left;
}
else if (h[i] < h[right]) {
maybe = right;
}
if (maybe === undefined) {
break;
}
const [iValue, mValue] = [h[i], h[maybe]];
h[i] = mValue;
h[maybe] = iValue;
i = maybe;
}
return rv;
}
[Symbol.iterator]() {
return this._heap[Symbol.iterator]();
}
}
exports.MaxHeap = MaxHeap;
class SmallestN {
constructor(_size) {
this._size = _size;
this._heap = new MaxHeap();
this._map = [];
}
update(key, value) {
if (this._heap.size < this._size) {
this._heap.insert(key);
this._map.push([key, value]);
return;
}
if (key >= this._heap.peekMax()) {
return;
}
this._heap.insert(key);
this._map.push([key, value]);
this.shrink();
}
shrink() {
const max = this._heap.extractMax();
let idx = this._map.length;
while (--idx >= 0) {
if (this._map[idx][0] === max) {
break;
}
}
if (idx === -1) {
throw new Error(`SmallestN: could not find entry for key ${max}`);
}
this._map.splice(idx, 1);
}
[Symbol.iterator]() {
return this._map[Symbol.iterator]();
}
entries() {
return this._map[Symbol.iterator];
}
keys() {
return [...this._heap];
}
get size() {
return this._size;
}
clear() {
this._heap.clear();
this._map = [];
}
setSize(newSize) {
while (this._size > newSize) {
this.shrink();
this._size--;
}
this._size = newSize;
}
}
exports.SmallestN = SmallestN;
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Initialized to `Number.NEGATIVE_INFINITY`. */\n    max = Number.NEGATIVE_INFINITY;\n    /** The minimum value observed. Initialized to `Number.POSITIVE_INFINITY`. */\n    min = Number.POSITIVE_INFINITY;\n    /** The variance of the values observed. */\n    variance = 0;\n    /** The standard deviation of the values observed. */\n    stdev = 0;\n    /** The mean (average) of the values observed. */\n    mean = NaN;\n\n    /**\n     * Incrementally track mean, stdev, min, max, of a sequence of values.\n     * @param printFixedPrecision - The number of decimal places to print in\n     * {@link Statistics.toString}.\n     */\n    constructor(\n        /** The number of decimal places to print in {@link Statistics.toString} */\n        protected printFixedPrecision: number = 1\n    ) {}\n\n    /** @internal */\n    clone() {\n        const rv = new Statistics(this.printFixedPrecision);\n        return Object.assign(rv, this);\n    }\n\n    /**\n     * Update statistics with a new value in the sequence.\n     */\n    update(value: number | undefined) {\n        if (value === undefined) {\n            return;\n        }\n        let previousMean = this.mean;\n        // https://math.stackexchange.com/questions/374881/recursive-formula-for-variance\n        let previousVariance = this.variance;\n        if (this.samples === 0) {\n            previousMean = 0;\n            previousVariance = 0;\n        }\n        this.samples++;\n        this.mean = previousMean + (value - previousMean) / this.samples;\n        this.variance =\n            ((previousVariance + (previousMean - value) ** 2 / this.samples) *\n                (this.samples - 1)) /\n            this.samples;\n        this.stdev = Math.sqrt(this.variance);\n        if (value > this.max) {\n            this.max = value;\n        }\n        if (value < this.min) {\n            this.min = value;\n        }\n    }\n\n    /**\n     * Print the mean of the observations seen, with the precision specified in\n     * the constructor.\n     */\n    toString() {\n        return `${this.mean.toFixed(this.printFixedPrecision)}`;\n    }\n}\n\nexport class ExponentiallyDecayingAverageValue {\n    samples = 0;\n    value = 0;\n    constructor(public smoothingFactor: number) {}\n    update(n: number) {\n        // tslint:disable-next-line:prefer-conditional-expression\n        if (this.samples++ === 0) {\n            this.value = n;\n        } else {\n            this.value =\n                this.smoothingFactor * n + (1 - this.smoothingFactor) * this.value;\n        }\n    }\n    toString() {\n        return this.value;\n    }\n}\n\nexport function sleep(ms: number, cancel = new Promise<void>(() => {})) {\n    let id: NodeJS.Timer;\n    cancel.then(_ => clearTimeout(id)).catch(_ => clearTimeout(id));\n    return Promise.race([new Promise(resolve => (id = setTimeout(resolve, ms))), cancel]);\n}\n\nexport function streamToBuffer(s: NodeJS.ReadableStream) {\n    return new Promise<Buffer>((resolve, reject) => {\n        const buffers: Buffer[] = [];\n        s.on(\"error\", reject);\n        s.on(\"data\", (data: Buffer) => buffers.push(data));\n        s.on(\"end\", () => resolve(Buffer.concat(buffers)));\n    });\n}\n\nexport function chomp(s: string) {\n    if (s.length > 0 && s[s.length - 1] === \"\\n\") {\n        s = s.slice(0, s.length - 1);\n    }\n    return s;\n}\n\nexport const sum = (a: number[]) => a.reduce((total, n) => total + n, 0);\n\nexport function objectSize(obj?: { [key: string]: string }) {\n    if (!obj) {\n        return 0;\n    }\n    return sum(Object.keys(obj).map(key => key.length + obj[key].length));\n}\n\nexport function computeHttpResponseBytes(\n    headers: { [key: string]: string },\n    opts = { httpHeaders: true, min: 0 }\n) {\n    const headerKeys = Object.keys(headers);\n    let contentLength = 0;\n    for (const key of headerKeys) {\n        if (key.match(/^content-length$/i)) {\n            contentLength = Number(headers[key]);\n            break;\n        }\n    }\n    if (!opts.httpHeaders) {\n        return Math.max(contentLength, opts.min);\n    }\n    const headerLength = objectSize(headers) + headerKeys.length * \": \".length;\n    const otherLength = 13;\n    return Math.max(contentLength + headerLength + otherLength, opts.min);\n}\n\nexport function hasExpired(\n    date: string | number | undefined | null,\n    retentionInDays: number\n) {\n    if (retentionInDays <= 0) {\n        return true;\n    }\n    const timestamp = typeof date === \"string\" ? Date.parse(date) : date || 0;\n    return timestamp < Date.now() - retentionInDays * 24 * 60 * 60 * 1000;\n}\n\nexport function roundTo100ms(n: number) {\n    return Math.round(n / 100) * 100;\n}\n\nexport const uuidv4Pattern =\n    \"[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}\";\n\nexport const GB = 2 ** 30;\nexport const MB = 2 ** 20;\nexport const KB = 2 ** 10;\n\nexport function f1(n: number) {\n    return n.toFixed(1);\n}\n\nexport function f2(n: number) {\n    return n.toFixed(2);\n}\n\nexport function keysOf<K extends string, O extends { [key in K]: any }>(\n    obj: O\n): Array<keyof O>;\nexport function keysOf<O extends object>(obj: O): Array<keyof O> {\n    return Object.keys(obj) as Array<keyof O>;\n}\n\nexport function defined<T>(arg: T | undefined | null | void): arg is T {\n    return !!arg;\n}\n\nexport class MaxHeap {\n    protected _heap: number[] = [];\n\n    get size() {\n        return this._heap.length;\n    }\n\n    clear() {\n        this._heap = [];\n    }\n\n    peekMax() {\n        return this._heap[0];\n    }\n\n    insert(value: number) {\n        const h = this._heap;\n        h.push(value);\n        let i = h.length - 1;\n        const parentOf = (n: number) => Math.floor((n - 1) / 2);\n        let parent = parentOf(i);\n        while (parent >= 0 && h[i] > h[parent]) {\n            const tmp = h[parent];\n            h[parent] = h[i];\n            h[i] = tmp;\n            i = parent;\n            parent = parentOf(i);\n        }\n    }\n\n    extractMax() {\n        const h = this._heap;\n        if (h.length === 0) {\n            throw new Error(\"extractMax called on empty heap\");\n        }\n        let i = 0;\n        const rv = h[0];\n        h[0] = h[h.length - 1];\n        h.pop();\n\n        while (i < h.length) {\n            const [left, right] = [i * 2 + 1, i * 2 + 2];\n            let maybe: number | undefined;\n            if (h[i] < h[left] && !(h[right] > h[left])) {\n                maybe = left;\n            } else if (h[i] < h[right]) {\n                maybe = right;\n            }\n            if (maybe === undefined) {\n                break;\n            }\n            const [iValue, mValue] = [h[i], h[maybe]];\n            h[i] = mValue;\n            h[maybe] = iValue;\n            i = maybe;\n        }\n\n        return rv;\n    }\n\n    [Symbol.iterator]() {\n        return this._heap[Symbol.iterator]();\n    }\n}\n\nexport class SmallestN<T = void> {\n    protected _heap = new MaxHeap();\n    protected _map: [number, T][] = [];\n\n    constructor(protected _size: number) {}\n\n    update(key: number, value: T) {\n        if (this._heap.size < this._size) {\n            this._heap.insert(key);\n            this._map.push([key, value]);\n            return;\n        }\n        if (key >= this._heap.peekMax()) {\n            return;\n        }\n        this._heap.insert(key);\n        this._map.push([key, value]);\n        this.shrink();\n    }\n\n    protected shrink() {\n        const max = this._heap.extractMax();\n        let idx = this._map.length;\n        while (--idx >= 0) {\n            if (this._map[idx][0] === max) {\n                break;\n            }\n        }\n        if (idx === -1) {\n            throw new Error(`SmallestN: could not find entry for key ${max}`);\n        }\n        this._map.splice(idx, 1);\n    }\n\n    [Symbol.iterator]() {\n        return this._map[Symbol.iterator]();\n    }\n\n    entries() {\n        return this._map[Symbol.iterator];\n    }\n\n    keys() {\n        return [...this._heap];\n    }\n\n    get size() {\n        return this._size;\n    }\n\n    clear() {\n        this._heap.clear();\n        this._map = [];\n    }\n\n    setSize(newSize: number) {\n        while (this._size > newSize) {\n            this.shrink();\n            this._size--;\n        }\n        this._size = newSize;\n    }\n}\n"]}