async-ware
v3.1.1
Published
A class for easily writing js middlewares
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async-ware
The programming idea(🧅 onion model) of koa middleware is great, it can be applied to more situations.
We need one class to include that all, so here comes this lib
- ✅ use it in one class(no need to include koa), see code example below
- ✅ variadic arguments for the whole running
- ✅ catch the error by
ware.run()
's promise
How to use
Install
npm i async-ware -S
Example
const Middleware = require('async-ware')
const ware = new Middleware()
ware.use(async (a, b, next) => {
console.log('middleware 1a ***', ++a.a, a)
await next()
console.log('middleware 1b ***', ++b.b, b)
})
ware.use(async (a, b, next) => {
console.log('middleware 2a ***', ++a.a, a)
await sleep(200)
await next()
await sleep(300)
console.log('middleware 2b ***', ++b.b, b)
})
ware.use(async (a, b, next) => {
console.log('middleware 3a ***', ++a.a, a)
await sleep(400)
await next()
await sleep(500)
console.log('middleware 3b ***', ++b.b, b)
})
// The middlewares above, function's arguments a and b is the `run` function's arguments
// You can use variadic arguments here
ware.run({ a: 10 }, { b: 20 })
.then(console.log)
.catch(console.error)
License
MIT