@abecodes/promise-helper 中文文档教程

发布于 5年前 浏览 27 项目主页 更新于 3年前

promise-helper

promise-helper 是一个简单的工具带,旨在帮助完成使用 promises 的更复杂的任务。 它支持诸如按顺序处理承诺、睡眠序列、 并行执行或有限并行执行,超时承诺和可取消承诺。

它是根据 UNLICENSE & 发布的。 支持现代环境。

Installation

使用 npm:

# global
$ npm i -g @abecodes/promise-helper

# dependency
$ npm i -S @abecodes/promise-helper

# dev dependecy
$ npm i -D @abecodes/promise-helper

在 Node.js 中:

// Require the package.
const ph = require("@abecodes/promise-helper");

API

sequence

// Default
ph.sequence(taskArray: [() => Promise<any>], cb?: (err, result) => any) => Promise<any>

// Adding timeout between each task
ph.sequence.withSleep(taskArray: [() => Promise<any>], timeout: number,cb?: (err, result) => any) => Promise<any>

// Adding a random timeout inbetween a given range between each task
ph.sequence.withSleepRange(taskArray: [() => Promise<any>], minTime: number, maxTime: number, cb?: (err, result) => any) => Promise<any>

sequence 方法接受一个 HOF 数组,这些 HOF 返回一个承诺并按顺序运行它们。 如果 sequence.withSleepsequence.withSleepRange 被调用,序列将在每个任务后休眠。

Sequence 可以用作 Promise 或与回调一起使用。 如果一项任务失败,则整个序列将失败。 如果出现错误,所有以前的结果都将是可访问的(如果不是假的)。

如果用作承诺,它们将作为结果属性传递到错误对象中。

如果与回调一起使用,它们将作为结果参数传递。

// Example
const p = ph.sequence.withSleep(
    [
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("Hello");
                }, 200);
            }),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("World");
                }, 200);
            }),
    ],
    2000
);
p.then(res => console.log(res)).catch(err => console.log(err, err.result));

parallel

// Default
ph.parallel(taskArray: [() => Promise<any>], cb?: (err, result) => any) => Promise<any>

// Triggering limited execution
ph.parallel.limited(taskArray: [() => Promise<any>], limit: number) => void

parallel 方法接受一个 HOF 数组,这些 HOF 返回一个 promise 并并行运行它们。

如果 parallel.limited 被调用, 只有给定数量的任务会并行运行。

Parallel 可以用作 Promise 或与回调一起使用。 如果一项任务失败,则整个序列将失败。

Parallel.limited 返回 void,因此每个任务都必须在初始化期间自行处理。

// Example
ph.parallel.limited(
    [
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("Hello");
                }, 200);
            }).then(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("World");
                }, 200);
            }).then(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    reject(new Error("oO"));
                }, 200);
            }).catch(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("working limited");
                }, 200);
            }).then(res => console.log(res)),
    ],
    2
);

timeout

// Default (throws timeout)
ph.timeout((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void, timeout: number, onTimeout?: () => any) => Promise<any>

// Instead of throwing an error, withNull will resolve with null on timeout
ph.timeout.withNull((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void, timeout: number, onTimeout?: () => any) => Promise<any>

timeout 方法创建一个绑定到超时的承诺。

如果 promise 未能及时响应,则会抛出错误。 如果使用了 timeout.withNull,它将解析为 null 而不是抛出。

由于 promise 的工作方式,原始 promise 仍将执行,但如果操作提供中止函数,则可以使用 onTimeout 回调触发。

// Example
const p = ph.timeout(
    (resolve, reject) => {
        req = https.get("https://www.google.de", res => resolve(res));
        req.on("error", err => reject(err));
        req.on("abort", () => reject());
    },
    20,
    () => req.abort()
);
p.then(res => console.log(res)).catch(err => console.log(err));

cancelable

// Invocation
const p = ph.cancelable((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void) => Promise<any>

// cancel (throws canceled)
p.cancel(onCancel?: () => void)

// cancelWithNull resolves with null
p.cancelWithNull(onCancel?: () => void)

cancelable 方法创建一个可以随意取消的承诺。

如果取消,它将引发错误。 如果使用了 cancelable.cancelWithNull,它将解析为 null 而不是抛出。

由于 promise 的工作方式,原始 promise 仍将执行,但如果操作提供中止函数,则可以使用 onCancel 回调触发。

// Example
let req;

const p = ph.cancelable((resolve, reject) => {
    req = https.get("https://www.google.de", res => resolve(res));
    req.on("error", err => reject(err));
    req.on("abort", () => reject());
});
p.then(res => console.log(res)).catch(err => console.log(err));

setTimeout(() => p.cancel(() => req.abort()), 20);

Greetings

愿您喜欢使用这款软件,就像我喜欢编写它一样。 保持无错误,度过美好的一天 <3

promise-helper

promise-helper is a simple toolbelt that aims to help with the more complex tasks of using promises. It supports operations like handling promises in sequence, sequences with sleeps, parallel execution or limited parallel execution, promises with timeout and cancelable promises.

It is released under the UNLICENSE & supports modern environments.

Installation

Using npm:

# global
$ npm i -g @abecodes/promise-helper

# dependency
$ npm i -S @abecodes/promise-helper

# dev dependecy
$ npm i -D @abecodes/promise-helper

In Node.js:

// Require the package.
const ph = require("@abecodes/promise-helper");

API

sequence

// Default
ph.sequence(taskArray: [() => Promise<any>], cb?: (err, result) => any) => Promise<any>

// Adding timeout between each task
ph.sequence.withSleep(taskArray: [() => Promise<any>], timeout: number,cb?: (err, result) => any) => Promise<any>

// Adding a random timeout inbetween a given range between each task
ph.sequence.withSleepRange(taskArray: [() => Promise<any>], minTime: number, maxTime: number, cb?: (err, result) => any) => Promise<any>

The sequence method takes an array of HOFs that return a promise an runs them in sequence. If sequence.withSleep or sequence.withSleepRange is called, the sequence will sleep after each task.

Sequence can be used as Promise or with a callback. If one task fails, the whole sequence will fail. In case of an error, all previous results will be accessable (if not falsy).

If used as promise, they will be passed in the error object as result property.

If used with a callback, they are passed as the result parameter.

// Example
const p = ph.sequence.withSleep(
    [
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("Hello");
                }, 200);
            }),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("World");
                }, 200);
            }),
    ],
    2000
);
p.then(res => console.log(res)).catch(err => console.log(err, err.result));

parallel

// Default
ph.parallel(taskArray: [() => Promise<any>], cb?: (err, result) => any) => Promise<any>

// Triggering limited execution
ph.parallel.limited(taskArray: [() => Promise<any>], limit: number) => void

The parallel method takes an array of HOFs that return a promise an runs them in parallel.

If parallel.limited is called, only the given number of tasks will run in parallel.

Parallel can be used as Promise or with a callback. If one task fails, the whole sequence will fail.

Parallel.limited returns void, so each task must be handled by itself during initialization.

// Example
ph.parallel.limited(
    [
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("Hello");
                }, 200);
            }).then(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("World");
                }, 200);
            }).then(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    reject(new Error("oO"));
                }, 200);
            }).catch(res => console.log(res)),
        () =>
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve("working limited");
                }, 200);
            }).then(res => console.log(res)),
    ],
    2
);

timeout

// Default (throws timeout)
ph.timeout((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void, timeout: number, onTimeout?: () => any) => Promise<any>

// Instead of throwing an error, withNull will resolve with null on timeout
ph.timeout.withNull((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void, timeout: number, onTimeout?: () => any) => Promise<any>

The timeout method creates a promise that is bound to a timeout.

If the promise fails to respond in time, it will throw an error. If timeout.withNull is used, it will resolve with null instead of throwing.

Due to how promises work, the original promise will still execute, but if the operation offers a abort function, it can be triggered with the onTimeout callback.

// Example
const p = ph.timeout(
    (resolve, reject) => {
        req = https.get("https://www.google.de", res => resolve(res));
        req.on("error", err => reject(err));
        req.on("abort", () => reject());
    },
    20,
    () => req.abort()
);
p.then(res => console.log(res)).catch(err => console.log(err));

cancelable

// Invocation
const p = ph.cancelable((executor: (resolve: (value?: any) => void, reject: (reason?: any)) => void) => void) => Promise<any>

// cancel (throws canceled)
p.cancel(onCancel?: () => void)

// cancelWithNull resolves with null
p.cancelWithNull(onCancel?: () => void)

The cancelable method creates a promise that could be canceled at will.

If canceled, it will throw an error. If cancelable.cancelWithNull is used, it will resolve with null instead of throwing.

Due to how promises work, the original promise will still execute, but if the operation offers a abort function, it can be triggered with the onCancel callback.

// Example
let req;

const p = ph.cancelable((resolve, reject) => {
    req = https.get("https://www.google.de", res => resolve(res));
    req.on("error", err => reject(err));
    req.on("abort", () => reject());
});
p.then(res => console.log(res)).catch(err => console.log(err));

setTimeout(() => p.cancel(() => req.abort()), 20);

Greetings

May you enjoy using this piece of software as much as I enjoyed writing it. Stay bug free and have an awesome day <3

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