143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
package zipkin
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import (
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"compress/gzip"
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"fmt"
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"io/ioutil"
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"mime"
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"net/http"
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"strings"
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"github.com/gorilla/mux"
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"github.com/influxdata/telegraf/plugins/inputs/zipkin/codec"
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"github.com/influxdata/telegraf/plugins/inputs/zipkin/codec/jsonV1"
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"github.com/influxdata/telegraf/plugins/inputs/zipkin/codec/thrift"
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)
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// SpanHandler is an implementation of a Handler which accepts zipkin thrift
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// span data and sends it to the recorder
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type SpanHandler struct {
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Path string
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recorder Recorder
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}
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// NewSpanHandler returns a new server instance given path to handle
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func NewSpanHandler(path string) *SpanHandler {
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return &SpanHandler{
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Path: path,
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}
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}
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func cors(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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if origin := r.Header.Get("Origin"); origin != "" {
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w.Header().Set(`Access-Control-Allow-Origin`, origin)
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w.Header().Set(`Access-Control-Allow-Methods`, strings.Join([]string{
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`OPTIONS`,
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`POST`,
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}, ", "))
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w.Header().Set(`Access-Control-Allow-Headers`, strings.Join([]string{
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`Accept`,
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`Accept-Encoding`,
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`Content-Length`,
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`Content-Type`,
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}, ", "))
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w.Header().Set(`Access-Control-Expose-Headers`, strings.Join([]string{
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`Date`,
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}, ", "))
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}
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if r.Method == "OPTIONS" {
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return
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}
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next.ServeHTTP(w, r)
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}
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}
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// Register implements the Service interface. Register accepts zipkin thrift data
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// POSTed to the path of the mux router
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func (s *SpanHandler) Register(router *mux.Router, recorder Recorder) error {
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handler := cors(http.HandlerFunc(s.Spans))
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router.Handle(s.Path, handler).Methods("POST", "OPTIONS")
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s.recorder = recorder
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return nil
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}
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// Spans handles zipkin thrift spans
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func (s *SpanHandler) Spans(w http.ResponseWriter, r *http.Request) {
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defer r.Body.Close()
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body := r.Body
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var err error
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// Handle gzip decoding of the body
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if r.Header.Get("Content-Encoding") == "gzip" {
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body, err = gzip.NewReader(r.Body)
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if err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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defer body.Close()
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}
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decoder, err := ContentDecoder(r)
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if err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusUnsupportedMediaType)
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}
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octets, err := ioutil.ReadAll(body)
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if err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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spans, err := decoder.Decode(octets)
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if err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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trace, err := codec.NewTrace(spans)
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if err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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if err = s.recorder.Record(trace); err != nil {
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s.recorder.Error(err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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// ContentDecoer returns a Decoder that is able to produce Traces from bytes.
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// Failure should yield an HTTP 415 (`http.StatusUnsupportedMediaType`)
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// If a Content-Type is not set, zipkin assumes application/json
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func ContentDecoder(r *http.Request) (codec.Decoder, error) {
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contentType := r.Header.Get("Content-Type")
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if contentType == "" {
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return &jsonV1.JSON{}, nil
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}
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for _, v := range strings.Split(contentType, ",") {
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t, _, err := mime.ParseMediaType(v)
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if err != nil {
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break
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}
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if t == "application/json" {
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return &jsonV1.JSON{}, nil
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} else if t == "application/x-thrift" {
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return &thrift.Thrift{}, nil
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}
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}
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return nil, fmt.Errorf("Unknown Content-Type: %s", contentType)
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}
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