forked from jaegertracing/jaeger
/
http_handler.go
120 lines (103 loc) · 3.32 KB
/
http_handler.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package zipkin
import (
"compress/gzip"
"fmt"
"io/ioutil"
"net/http"
"strings"
"time"
"github.com/apache/thrift/lib/go/thrift"
"github.com/gorilla/mux"
tchanThrift "github.com/uber/tchannel-go/thrift"
"github.com/uber/jaeger/cmd/collector/app"
"github.com/uber/jaeger/thrift-gen/zipkincore"
)
// APIHandler handles all HTTP calls to the collector
type APIHandler struct {
zipkinSpansHandler app.ZipkinSpansHandler
}
// NewAPIHandler returns a new APIHandler
func NewAPIHandler(
zipkinSpansHandler app.ZipkinSpansHandler,
) *APIHandler {
return &APIHandler{
zipkinSpansHandler: zipkinSpansHandler,
}
}
// RegisterRoutes registers Zipkin routes
func (aH *APIHandler) RegisterRoutes(router *mux.Router) {
router.HandleFunc("/api/v1/spans", aH.saveSpans).Methods(http.MethodPost)
}
func (aH *APIHandler) saveSpans(w http.ResponseWriter, r *http.Request) {
bRead := r.Body
defer r.Body.Close()
if strings.Contains(r.Header.Get("Content-Encoding"), "gzip") {
gz, err := gzip.NewReader(r.Body)
if err != nil {
http.Error(w, fmt.Sprintf(app.UnableToReadBodyErrFormat, err), http.StatusBadRequest)
return
}
defer gz.Close()
bRead = gz
}
bodyBytes, err := ioutil.ReadAll(bRead)
if err != nil {
http.Error(w, fmt.Sprintf(app.UnableToReadBodyErrFormat, err), http.StatusInternalServerError)
return
}
contentType := r.Header.Get("Content-Type")
var tSpans []*zipkincore.Span
if contentType == "application/x-thrift" {
tSpans, err = deserializeThrift(bodyBytes)
} else if contentType == "application/json" {
tSpans, err = deserializeJSON(bodyBytes)
} else {
http.Error(w, "Unsupported Content-Type", http.StatusBadRequest)
return
}
if err != nil {
http.Error(w, fmt.Sprintf(app.UnableToReadBodyErrFormat, err), http.StatusBadRequest)
return
}
if len(tSpans) > 0 {
ctx, _ := tchanThrift.NewContext(time.Minute)
if _, err = aH.zipkinSpansHandler.SubmitZipkinBatch(ctx, tSpans); err != nil {
http.Error(w, fmt.Sprintf("Cannot submit Zipkin batch: %v", err), http.StatusInternalServerError)
return
}
}
w.WriteHeader(http.StatusAccepted)
}
func deserializeThrift(b []byte) ([]*zipkincore.Span, error) {
buffer := thrift.NewTMemoryBuffer()
buffer.Write(b)
transport := thrift.NewTBinaryProtocolTransport(buffer)
_, size, err := transport.ReadListBegin() // Ignore the returned element type
if err != nil {
return nil, err
}
// We don't depend on the size returned by ReadListBegin to preallocate the array because it
// sometimes returns a nil error on bad input and provides an unreasonably large int for size
var spans []*zipkincore.Span
for i := 0; i < size; i++ {
zs := &zipkincore.Span{}
if err = zs.Read(transport); err != nil {
return nil, err
}
spans = append(spans, zs)
}
return spans, nil
}