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'use strict'
const { parseHeaders } = require('../core/util')
const DecoratorHandler = require('../handler/decorator-handler')
const { ResponseError } = require('../core/errors')
class Handler extends DecoratorHandler {
#handler
#statusCode
#contentType
#decoder
#headers
#body
constructor (opts, { handler }) {
super(handler)
this.#handler = handler
}
onConnect (abort) {
this.#statusCode = 0
this.#contentType = null
this.#decoder = null
this.#headers = null
this.#body = ''
return this.#handler.onConnect(abort)
}
onHeaders (statusCode, rawHeaders, resume, statusMessage, headers = parseHeaders(rawHeaders)) {
this.#statusCode = statusCode
this.#headers = headers
this.#contentType = headers['content-type']
if (this.#statusCode < 400) {
return this.#handler.onHeaders(statusCode, rawHeaders, resume, statusMessage, headers)
}
if (this.#contentType === 'application/json' || this.#contentType === 'text/plain') {
this.#decoder = new TextDecoder('utf-8')
}
}
onData (chunk) {
if (this.#statusCode < 400) {
return this.#handler.onData(chunk)
}
this.#body += this.#decoder?.decode(chunk, { stream: true }) ?? ''
}
onComplete (rawTrailers) {
if (this.#statusCode >= 400) {
this.#body += this.#decoder?.decode(undefined, { stream: false }) ?? ''
if (this.#contentType === '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, this.#headers, this.#body)
} finally {
Error.stackTraceLimit = stackTraceLimit
}
this.#handler.onError(err)
} else {
this.#handler.onComplete(rawTrailers)
}
}
onError (err) {
this.#handler.onError(err)
}
}
module.exports = (dispatch) => (opts, handler) => opts.throwOnError
? dispatch(opts, new Handler(opts, { handler }))
: dispatch(opts, handler)
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