49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
'use strict'
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const EventEmitter = require('node:events')
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const WrapHandler = require('../handler/wrap-handler')
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const wrapInterceptor = (dispatch) => (opts, handler) => dispatch(opts, WrapHandler.wrap(handler))
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class Dispatcher extends EventEmitter {
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dispatch () {
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throw new Error('not implemented')
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}
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close () {
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throw new Error('not implemented')
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}
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destroy () {
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throw new Error('not implemented')
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}
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compose (...args) {
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// So we handle [interceptor1, interceptor2] or interceptor1, interceptor2, ...
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const interceptors = Array.isArray(args[0]) ? args[0] : args
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let dispatch = this.dispatch.bind(this)
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for (const interceptor of interceptors) {
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if (interceptor == null) {
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continue
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}
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if (typeof interceptor !== 'function') {
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throw new TypeError(`invalid interceptor, expected function received ${typeof interceptor}`)
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}
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dispatch = interceptor(dispatch)
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dispatch = wrapInterceptor(dispatch)
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if (dispatch == null || typeof dispatch !== 'function' || dispatch.length !== 2) {
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throw new TypeError('invalid interceptor')
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}
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}
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return new Proxy(this, {
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get: (target, key) => key === 'dispatch' ? dispatch : target[key]
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})
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}
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}
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module.exports = Dispatcher
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