2021-02-22 17:27:13 +05:30
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package badgateway
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import (
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"bytes"
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"fmt"
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"html/template"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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2021-10-27 15:23:28 +05:30
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"gitlab.com/gitlab-org/gitlab/workhorse/internal/log"
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2021-02-22 17:27:13 +05:30
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)
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// Error is a custom error for pretty Sentry 'issues'
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type sentryError struct{ error }
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type roundTripper struct {
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next http.RoundTripper
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developmentMode bool
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}
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// NewRoundTripper creates a RoundTripper with a provided underlying next transport
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func NewRoundTripper(developmentMode bool, next http.RoundTripper) http.RoundTripper {
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return &roundTripper{next: next, developmentMode: developmentMode}
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}
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func (t *roundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
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start := time.Now()
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res, err := t.next.RoundTrip(r)
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if err == nil {
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return res, err
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}
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// httputil.ReverseProxy translates all errors from this
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// RoundTrip function into 500 errors. But the most likely error
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// is that the Rails app is not responding, in which case users
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// and administrators expect to see a 502 error. To show 502s
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// instead of 500s we catch the RoundTrip error here and inject a
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// 502 response.
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fields := log.Fields{"duration_ms": int64(time.Since(start).Seconds() * 1000)}
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2021-03-08 18:12:59 +05:30
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log.WithRequest(r).WithFields(fields).WithError(&sentryError{fmt.Errorf("badgateway: failed to receive response: %v", err)}).Error()
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2021-02-22 17:27:13 +05:30
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injectedResponse := &http.Response{
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StatusCode: http.StatusBadGateway,
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Status: http.StatusText(http.StatusBadGateway),
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Request: r,
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ProtoMajor: r.ProtoMajor,
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ProtoMinor: r.ProtoMinor,
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Proto: r.Proto,
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Header: make(http.Header),
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Trailer: make(http.Header),
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}
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message := "GitLab is not responding"
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contentType := "text/plain"
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if t.developmentMode {
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message, contentType = developmentModeResponse(err)
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}
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injectedResponse.Body = ioutil.NopCloser(strings.NewReader(message))
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injectedResponse.Header.Set("Content-Type", contentType)
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return injectedResponse, nil
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}
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func developmentModeResponse(err error) (body string, contentType string) {
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data := TemplateData{
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Time: time.Now().Format("15:04:05"),
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Error: err.Error(),
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ReloadSeconds: 5,
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}
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buf := &bytes.Buffer{}
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if err := developmentErrorTemplate.Execute(buf, data); err != nil {
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return data.Error, "text/plain"
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}
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return buf.String(), "text/html"
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}
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type TemplateData struct {
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Time string
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Error string
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ReloadSeconds int
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}
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var developmentErrorTemplate = template.Must(template.New("error502").Parse(`
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<html>
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<head>
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<title>502: GitLab is not responding</title>
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<script>
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window.setTimeout(function() { location.reload() }, {{.ReloadSeconds}} * 1000)
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</script>
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</head>
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<body>
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<h1>502</h1>
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<p>GitLab is not responding. The error was:</p>
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<pre>{{.Error}}</pre>
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<p>If you just started GDK it can take 60-300 seconds before GitLab has finished booting. This page will automatically reload every {{.ReloadSeconds}} seconds.</p>
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<footer>Generated by gitlab-workhorse running in development mode at {{.Time}}.</footer>
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</body>
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</html>
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`))
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