105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package senddata
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import (
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"net/http"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/headers"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/helper"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/senddata/contentprocessor"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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var (
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sendDataResponses = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "gitlab_workhorse_senddata_responses",
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Help: "How many HTTP responses have been hijacked by a workhorse senddata injecter",
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},
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[]string{"injecter"},
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)
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sendDataResponseBytes = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "gitlab_workhorse_senddata_response_bytes",
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Help: "How many bytes have been written by workhorse senddata response injecters",
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},
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[]string{"injecter"},
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)
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)
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type sendDataResponseWriter struct {
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rw http.ResponseWriter
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status int
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hijacked bool
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req *http.Request
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injecters []Injecter
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}
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func SendData(h http.Handler, injecters ...Injecter) http.Handler {
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return contentprocessor.SetContentHeaders(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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s := sendDataResponseWriter{
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rw: w,
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req: r,
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injecters: injecters,
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}
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defer s.flush()
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h.ServeHTTP(&s, r)
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}))
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}
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func (s *sendDataResponseWriter) Header() http.Header {
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return s.rw.Header()
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}
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func (s *sendDataResponseWriter) Write(data []byte) (int, error) {
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if s.status == 0 {
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s.WriteHeader(http.StatusOK)
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}
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if s.hijacked {
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return len(data), nil
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}
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return s.rw.Write(data)
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}
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func (s *sendDataResponseWriter) WriteHeader(status int) {
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if s.status != 0 {
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return
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}
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s.status = status
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if s.status == http.StatusOK && s.tryInject() {
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return
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}
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s.rw.WriteHeader(s.status)
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}
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func (s *sendDataResponseWriter) tryInject() bool {
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if s.hijacked {
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return false
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}
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header := s.Header().Get(headers.GitlabWorkhorseSendDataHeader)
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if header == "" {
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return false
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}
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for _, injecter := range s.injecters {
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if injecter.Match(header) {
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s.hijacked = true
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helper.DisableResponseBuffering(s.rw)
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crw := helper.NewCountingResponseWriter(s.rw)
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injecter.Inject(crw, s.req, header)
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sendDataResponses.WithLabelValues(injecter.Name()).Inc()
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sendDataResponseBytes.WithLabelValues(injecter.Name()).Add(float64(crw.Count()))
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return true
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}
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}
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return false
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}
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func (s *sendDataResponseWriter) flush() {
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s.WriteHeader(http.StatusOK)
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}
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