/
createSetupServer.ts
182 lines (157 loc) · 5.45 KB
/
createSetupServer.ts
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import chalk from 'chalk'
const { bold } = chalk
import { isNodeProcess } from 'is-node-process'
import { StrictEventEmitter } from 'strict-event-emitter'
import {
BatchInterceptor,
MockedResponse as MockedInterceptedResponse,
Interceptor,
HttpRequestEventMap,
} from '@mswjs/interceptors'
import * as requestHandlerUtils from '../utils/internal/requestHandlerUtils'
import { ServerLifecycleEventsMap, SetupServerApi } from './glossary'
import { SharedOptions } from '../sharedOptions'
import { RequestHandler } from '../handlers/RequestHandler'
import { handleRequest } from '../utils/handleRequest'
import { mergeRight } from '../utils/internal/mergeRight'
import { devUtils } from '../utils/internal/devUtils'
import { pipeEvents } from '../utils/internal/pipeEvents'
import { RequiredDeep } from '../typeUtils'
import { MockedRequest } from '../utils/request/MockedRequest'
import { toReadonlyArray } from '../utils/internal/toReadonlyArray'
const DEFAULT_LISTEN_OPTIONS: RequiredDeep<SharedOptions> = {
onUnhandledRequest: 'warn',
}
/**
* Creates a `setupServer` API using given request interceptors.
* Useful to generate identical API using different patches to request issuing modules.
*/
export function createSetupServer(
...interceptors: { new (): Interceptor<HttpRequestEventMap> }[]
) {
const emitter = new StrictEventEmitter<ServerLifecycleEventsMap>()
const publicEmitter = new StrictEventEmitter<ServerLifecycleEventsMap>()
pipeEvents(emitter, publicEmitter)
return function setupServer(
...requestHandlers: RequestHandler[]
): SetupServerApi {
requestHandlers.forEach((handler) => {
if (Array.isArray(handler))
throw new Error(
devUtils.formatMessage(
'Failed to call "setupServer" given an Array of request handlers (setupServer([a, b])), expected to receive each handler individually: setupServer(a, b).',
),
)
})
// Store the list of request handlers for the current server instance,
// so it could be modified at a runtime.
let currentHandlers: RequestHandler[] = [...requestHandlers]
// Error when attempting to run this function in a browser environment.
if (!isNodeProcess()) {
throw new Error(
devUtils.formatMessage(
'Failed to execute `setupServer` in the environment that is not Node.js (i.e. a browser). Consider using `setupWorker` instead.',
),
)
}
let resolvedOptions = {} as RequiredDeep<SharedOptions>
const interceptor = new BatchInterceptor({
name: 'setup-server',
interceptors: interceptors.map((Interceptor) => new Interceptor()),
})
interceptor.on('request', async function setupServerListener(request) {
const mockedRequest = new MockedRequest(request.url, {
...request,
body: await request.arrayBuffer(),
})
const response = await handleRequest<
MockedInterceptedResponse & { delay?: number }
>(mockedRequest, currentHandlers, resolvedOptions, emitter, {
transformResponse(response) {
return {
status: response.status,
statusText: response.statusText,
headers: response.headers.all(),
body: response.body,
delay: response.delay,
}
},
})
if (response) {
// Delay Node.js responses in the listener so that
// the response lookup logic is not concerned with responding
// in any way. The same delay is implemented in the worker.
if (response.delay) {
await new Promise((resolve) => {
setTimeout(resolve, response.delay)
})
}
request.respondWith(response)
}
return
})
interceptor.on('response', (request, response) => {
if (!request.id) {
return
}
if (response.headers.get('x-powered-by') === 'msw') {
emitter.emit('response:mocked', response, request.id)
} else {
emitter.emit('response:bypass', response, request.id)
}
})
return {
listen(options) {
resolvedOptions = mergeRight(
DEFAULT_LISTEN_OPTIONS,
options || {},
) as RequiredDeep<SharedOptions>
interceptor.apply()
},
use(...handlers) {
requestHandlerUtils.use(currentHandlers, ...handlers)
},
restoreHandlers() {
requestHandlerUtils.restoreHandlers(currentHandlers)
},
resetHandlers(...nextHandlers) {
currentHandlers = requestHandlerUtils.resetHandlers(
requestHandlers,
...nextHandlers,
)
},
listHandlers() {
return toReadonlyArray(currentHandlers)
},
printHandlers() {
const handlers = this.listHandlers()
handlers.forEach((handler) => {
const { header, callFrame } = handler.info
const pragma = handler.info.hasOwnProperty('operationType')
? '[graphql]'
: '[rest]'
console.log(`\
${bold(`${pragma} ${header}`)}
Declaration: ${callFrame}
`)
})
},
events: {
on(...args) {
return publicEmitter.on(...args)
},
removeListener(...args) {
return publicEmitter.removeListener(...args)
},
removeAllListeners(...args) {
return publicEmitter.removeAllListeners(...args)
},
},
close() {
emitter.removeAllListeners()
publicEmitter.removeAllListeners()
interceptor.dispose()
},
}
}
}