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package testutil
import (
"bytes"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"time"
)
type HTTPServer struct {
URL string
Timeout time.Duration
started bool
request chan *http.Request
response chan ResponseFunc
}
type Response struct {
Status int
Headers map[string]string
Body string
}
var DefaultClient = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
},
}
func NewHTTPServer() *HTTPServer {
return &HTTPServer{URL: "http://localhost:4444", Timeout: 5 * time.Second}
}
type ResponseFunc func(path string) Response
func (s *HTTPServer) Start() {
if s.started {
return
}
s.started = true
s.request = make(chan *http.Request, 1024)
s.response = make(chan ResponseFunc, 1024)
u, err := url.Parse(s.URL)
if err != nil {
panic(err)
}
l, err := net.Listen("tcp", u.Host)
if err != nil {
panic(err)
}
go http.Serve(l, s)
s.Response(203, nil, "")
for {
// Wait for it to be up.
resp, err := http.Get(s.URL)
if err == nil && resp.StatusCode == 203 {
break
}
time.Sleep(1e8)
}
s.WaitRequest() // Consume dummy request.
}
// Flush discards all pending requests and responses.
func (s *HTTPServer) Flush() {
for {
select {
case <-s.request:
case <-s.response:
default:
return
}
}
}
func body(req *http.Request) string {
data, err := ioutil.ReadAll(req.Body)
if err != nil {
panic(err)
}
return string(data)
}
func (s *HTTPServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
req.ParseMultipartForm(1e6)
data, err := ioutil.ReadAll(req.Body)
if err != nil {
panic(err)
}
req.Body = ioutil.NopCloser(bytes.NewBuffer(data))
s.request <- req
var resp Response
select {
case respFunc := <-s.response:
resp = respFunc(req.URL.Path)
case <-time.After(s.Timeout):
const msg = "ERROR: Timeout waiting for test to prepare a response\n"
fmt.Fprintf(os.Stderr, msg)
resp = Response{500, nil, msg}
}
if resp.Headers != nil {
h := w.Header()
for k, v := range resp.Headers {
h.Set(k, v)
}
}
if resp.Status != 0 {
w.WriteHeader(resp.Status)
}
w.Write([]byte(resp.Body))
}
// WaitRequests returns the next n requests made to the http server from
// the queue. If not enough requests were previously made, it waits until
// the timeout value for them to be made.
func (s *HTTPServer) WaitRequests(n int) []*http.Request {
reqs := make([]*http.Request, 0, n)
for i := 0; i < n; i++ {
select {
case req := <-s.request:
reqs = append(reqs, req)
case <-time.After(s.Timeout):
panic("Timeout waiting for request")
}
}
return reqs
}
// WaitRequest returns the next request made to the http server from
// the queue. If no requests were previously made, it waits until the
// timeout value for one to be made.
func (s *HTTPServer) WaitRequest() *http.Request {
return s.WaitRequests(1)[0]
}
// ResponseFunc prepares the test server to respond the following n
// requests using f to build each response.
func (s *HTTPServer) ResponseFunc(n int, f ResponseFunc) {
for i := 0; i < n; i++ {
s.response <- f
}
}
// ResponseMap maps request paths to responses.
type ResponseMap map[string]Response
// ResponseMap prepares the test server to respond the following n
// requests using the m to obtain the responses.
func (s *HTTPServer) ResponseMap(n int, m ResponseMap) {
f := func(path string) Response {
for rpath, resp := range m {
if rpath == path {
return resp
}
}
body := "Path not found in response map: " + path
return Response{Status: 500, Body: body}
}
s.ResponseFunc(n, f)
}
// Responses prepares the test server to respond the following n requests
// using the provided response parameters.
func (s *HTTPServer) Responses(n int, status int, headers map[string]string, body string) {
f := func(path string) Response {
return Response{status, headers, body}
}
s.ResponseFunc(n, f)
}
// Response prepares the test server to respond the following request
// using the provided response parameters.
func (s *HTTPServer) Response(status int, headers map[string]string, body string) {
s.Responses(1, status, headers, body)
}
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