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appolo-context

v6.0.9

Published

async hooks context storage

Downloads

239

Readme

Appolo Context

Build Status Dependencies status NPM version npm Downloads Known Vulnerabilities

nodejs async hooks context storage can be used to create context per request

Attention! This package is using the new experimental async hooks API.

Installation:

npm install appolo-context --save

Usage

import {namespace} from "appolo-context";

let context = namespace.create("someName");
context.initialize();

class A {
 run(){
    let context = namespace.get("someName")

    context.set("id","someId")

    return Promise.resolve();
 }
}

class B {
 run(){
    let context = namespace.get("someName")

    let id = context.get("id");

    return Promise.resolve(id);
 }
}

context.scope(async()=>{
    await new A().run();
    let id  = await new B().run();

    console.log(id) // someId
})

Express Usage

import {context} from "appolo-context";
import * as express from "express";

context.initialize();

let app = express();
app.use((req,res,next)=>{
    context.scope(()=>{
        context.set("id",uuid.v1());
        next();
    })
})

app.use(async (req,res,next())=>{
    let reuslt  = await doSomethingAsync();
    res.send(reuslt)
})

Now you can retrieve the context in any file or function.

import {context} from "appolo-context";

async function doSomethingAsync(){

    return context.get("id");
}

Namespace

create(name:string|Symbol):Context

Create new context by given name

import {namespace} from "appolo-context";

let context = namespace.create("someName");
context.initialize();

get(name:string|Symbol):Context

get context by given name

import {namespace} from "appolo-context";

let context = namespace.get("someName");
context.get("someValue")

delete(name:string|Symbol)

delete context by given name and destroy it

import {namespace} from "appolo-context";

let context = namespace.delete("someName");

get context():Context

get the default context

import {namespace} from "appolo-context";

let context = namespace.context;

context.initialize()

Context

initialize()

initialize the async hooks must be called before any get or set methods this will create the async hooks and enable them.

Context

scope(fn:Function)

create new context scope and triggers the given function

import {context} from "appolo-context";
import * as express from "express";

context.initialize();

let app = express();
app.use((req,res,next)=>{
    context.scope(()=>{
        context.set("id",uuid.v1());
        next();
    })
})

get(key:any):any

get context value by key

set(key:any,value:any)

set context value by key

enable()

enable the async hooks

destroy()

destroy the context and clean all resources.

License

MIT