forked from fastify/fastify
/
error-handler.js
159 lines (138 loc) · 4.25 KB
/
error-handler.js
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'use strict'
const FJS = require('fast-json-stringify')
const statusCodes = require('http').STATUS_CODES
const wrapThenable = require('./wrapThenable')
const {
kReplyHeaders, kReplyNextErrorHandler, kReplyIsRunningOnErrorHook, kReplyHasStatusCode
} = require('./symbols.js')
const {
FST_ERR_REP_INVALID_PAYLOAD_TYPE
} = require('./errors')
const { getSchemaSerializer } = require('./schemas')
const serializeError = FJS({
type: 'object',
properties: {
statusCode: { type: 'number' },
code: { type: 'string' },
error: { type: 'string' },
message: { type: 'string' }
}
})
const rootErrorHandler = {
func: defaultErrorHandler,
toJSON () {
return this.func.name.toString() + '()'
}
}
function handleError (reply, error, cb) {
reply[kReplyIsRunningOnErrorHook] = false
const context = reply.context
if (reply[kReplyNextErrorHandler] === false) {
fallbackErrorHandler(error, reply, function (reply, payload) {
reply.raw.writeHead(reply.raw.statusCode, reply[kReplyHeaders])
reply.raw.end(payload)
})
return
}
const errorHandler = reply[kReplyNextErrorHandler] || context.errorHandler
// In case the error handler throws, we set the next errorHandler so we can error again
reply[kReplyNextErrorHandler] = Object.getPrototypeOf(errorHandler)
reply[kReplyHeaders]['content-length'] = undefined
const func = errorHandler.func
if (!func) {
reply[kReplyNextErrorHandler] = false
fallbackErrorHandler(error, reply, cb)
return
}
const result = func(error, reply.request, reply)
if (result !== undefined) {
if (result !== null && typeof result.then === 'function') {
wrapThenable(result, reply)
} else {
reply.send(result)
}
}
}
function defaultErrorHandler (error, request, reply) {
setErrorHeaders(error, reply)
if (!reply[kReplyHasStatusCode] || reply.statusCode === 200) {
const statusCode = error.statusCode || error.status
reply.code(statusCode >= 400 ? statusCode : 500)
}
if (reply.statusCode < 500) {
reply.log.info(
{ res: reply, err: error },
error && error.message
)
} else {
reply.log.error(
{ req: request, res: reply, err: error },
error && error.message
)
}
reply.send(error)
}
function fallbackErrorHandler (error, reply, cb) {
const res = reply.raw
const statusCode = reply.statusCode
let payload
try {
const serializerFn = getSchemaSerializer(reply.context, statusCode)
payload = (serializerFn === false)
? serializeError({
error: statusCodes[statusCode + ''],
code: error.code,
message: error.message,
statusCode: statusCode
})
: serializerFn(Object.create(error, {
error: { value: statusCodes[statusCode + ''] },
message: { value: error.message },
statusCode: { value: statusCode }
}))
} catch (err) {
// error is always FST_ERR_SCH_SERIALIZATION_BUILD because this is called from route/compileSchemasForSerialization
reply.log.error({ err, statusCode: res.statusCode }, 'The serializer for the given status code failed')
reply.code(500)
payload = serializeError({
error: statusCodes['500'],
message: err.message,
statusCode: 500
})
}
if (typeof payload !== 'string' && !Buffer.isBuffer(payload)) {
payload = serializeError(new FST_ERR_REP_INVALID_PAYLOAD_TYPE(typeof payload))
}
reply[kReplyHeaders]['content-type'] = 'application/json; charset=utf-8'
reply[kReplyHeaders]['content-length'] = '' + Buffer.byteLength(payload)
cb(reply, payload)
}
function buildErrorHandler (parent = rootErrorHandler, func) {
if (!func) {
return parent
}
const errorHandler = Object.create(parent)
errorHandler.func = func
return errorHandler
}
function setErrorHeaders (error, reply) {
const res = reply.raw
let statusCode = res.statusCode
statusCode = (statusCode >= 400) ? statusCode : 500
// treat undefined and null as same
if (error != null) {
if (error.headers !== undefined) {
reply.headers(error.headers)
}
if (error.status >= 400) {
statusCode = error.status
} else if (error.statusCode >= 400) {
statusCode = error.statusCode
}
}
res.statusCode = statusCode
}
module.exports = {
buildErrorHandler,
handleError
}