136 lines
3.0 KiB
Go
136 lines
3.0 KiB
Go
package zipkin
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import (
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"compress/gzip"
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"io/ioutil"
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"net/http"
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"strings"
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"sync"
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"github.com/apache/thrift/lib/go/thrift"
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"github.com/gorilla/mux"
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"github.com/openzipkin/zipkin-go-opentracing/_thrift/gen-go/zipkincore"
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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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waitGroup *sync.WaitGroup
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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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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 := unmarshalThrift(octets)
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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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trace := NewTrace(spans)
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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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func unmarshalThrift(body []byte) ([]*zipkincore.Span, error) {
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buffer := thrift.NewTMemoryBuffer()
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if _, err := buffer.Write(body); err != nil {
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return nil, err
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}
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transport := thrift.NewTBinaryProtocolTransport(buffer)
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_, size, err := transport.ReadListBegin()
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if err != nil {
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return nil, err
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}
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spans := make([]*zipkincore.Span, size)
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for i := 0; i < size; i++ {
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zs := &zipkincore.Span{}
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if err = zs.Read(transport); err != nil {
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return nil, err
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}
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spans[i] = zs
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}
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if err = transport.ReadListEnd(); err != nil {
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return nil, err
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}
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return spans, nil
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}
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