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'use strict'
// const { parseHeaders } = require('../core/util')
const DecoratorHandler = require('../handler/decorator-handler')
const { ResponseError } = require('../core/errors')
class ResponseErrorHandler extends DecoratorHandler {
#statusCode
#contentType
#decoder
#headers
#body
constructor (_opts, { handler }) {
super(handler)
}
#checkContentType (contentType) {
return (this.#contentType ?? '').indexOf(contentType) === 0
}
onRequestStart (controller, context) {
this.#statusCode = 0
this.#contentType = null
this.#decoder = null
this.#headers = null
this.#body = ''
return super.onRequestStart(controller, context)
}
onResponseStart (controller, statusCode, headers, statusMessage) {
this.#statusCode = statusCode
this.#headers = headers
this.#contentType = headers['content-type']
if (this.#statusCode < 400) {
return super.onResponseStart(controller, statusCode, headers, statusMessage)
}
if (this.#checkContentType('application/json') || this.#checkContentType('text/plain')) {
this.#decoder = new TextDecoder('utf-8')
}
}
onResponseData (controller, chunk) {
if (this.#statusCode < 400) {
return super.onResponseData(controller, chunk)
}
this.#body += this.#decoder?.decode(chunk, { stream: true }) ?? ''
}
onResponseEnd (controller, trailers) {
if (this.#statusCode >= 400) {
this.#body += this.#decoder?.decode(undefined, { stream: false }) ?? ''
if (this.#checkContentType('application/json')) {
try {
this.#body = JSON.parse(this.#body)
} catch {
// Do nothing...
}
}
let err
const stackTraceLimit = Error.stackTraceLimit
Error.stackTraceLimit = 0
try {
err = new ResponseError('Response Error', this.#statusCode, {
body: this.#body,
headers: this.#headers
})
} finally {
Error.stackTraceLimit = stackTraceLimit
}
super.onResponseError(controller, err)
} else {
super.onResponseEnd(controller, trailers)
}
}
onResponseError (controller, err) {
super.onResponseError(controller, err)
}
}
module.exports = () => {
return (dispatch) => {
return function Intercept (opts, handler) {
return dispatch(opts, new ResponseErrorHandler(opts, { handler }))
}
}
}
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