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trace_receiver.go
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/
trace_receiver.go
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// Copyright The OpenTelemetry Authors
//
// 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:https://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 mockawsxrayreceiver
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"sync"
"github.com/gorilla/mux"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/component/componenterror"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/pdata"
"go.opentelemetry.io/collector/obsreport"
"go.uber.org/zap"
)
// MockAwsXrayReceiver type is used to handle spans received in the AWS data format.
type MockAwsXrayReceiver struct {
mu sync.Mutex
startOnce sync.Once
stopOnce sync.Once
logger *zap.Logger
config *Config
server *http.Server
nextConsumer consumer.TracesConsumer
}
// New creates a new awsxrayreceiver.MockAwsXrayReceiver reference.
func New(
nextConsumer consumer.TracesConsumer,
params component.ReceiverCreateParams,
config *Config) (*MockAwsXrayReceiver, error) {
if nextConsumer == nil {
return nil, componenterror.ErrNilNextConsumer
}
ar := &MockAwsXrayReceiver{
logger: params.Logger,
config: config,
nextConsumer: nextConsumer,
}
return ar, nil
}
// Start spins up the receiver's HTTP server and makes the receiver start its processing.
func (ar *MockAwsXrayReceiver) Start(_ context.Context, host component.Host) error {
ar.mu.Lock()
defer ar.mu.Unlock()
var err = componenterror.ErrAlreadyStarted
ar.startOnce.Do(func() {
var ln net.Listener
// set up the listener
ln, err = net.Listen("tcp", ar.config.Endpoint)
if err != nil {
err = fmt.Errorf("failed to bind to address %s: %v", ar.config.Endpoint, err)
return
}
ar.logger.Info(fmt.Sprintf("listen to address %s", ar.config.Endpoint))
// use gorilla mux to create a router/handler
nr := mux.NewRouter()
nr.HandleFunc("/TraceSegments", ar.HTTPHandlerFunc)
// create a server with the handler
ar.server = &http.Server{Handler: nr}
// run the server on a routine
go func() {
if ar.config.TLSCredentials != nil {
host.ReportFatalError(ar.server.ServeTLS(ln, ar.config.TLSCredentials.CertFile, ar.config.TLSCredentials.KeyFile))
} else {
host.ReportFatalError(ar.server.Serve(ln))
}
}()
})
return err
}
// handleRequest parses an http request containing aws json request and passes the count of the traces to next consumer
func (ar *MockAwsXrayReceiver) handleRequest(ctx context.Context, req *http.Request) error {
transport := "http"
if ar.config.TLSCredentials != nil {
transport = "https"
}
ctx = obsreport.ReceiverContext(ctx, ar.config.Name(), transport, "")
ctx = obsreport.StartTraceDataReceiveOp(ctx, ar.config.Name(), transport)
body, err := ioutil.ReadAll(req.Body)
if err != nil {
log.Fatalln(err)
}
var result map[string]interface{}
json.Unmarshal(body, &result)
traces, _ := ToTraces(body)
ar.nextConsumer.ConsumeTraces(ctx, *traces)
return nil
}
// HTTPHandlerFunction returns an http.HandlerFunc that handles awsXray requests
func (ar *MockAwsXrayReceiver) HTTPHandlerFunc(rw http.ResponseWriter, req *http.Request) {
// create context with the receiver name from the request context
ctx := obsreport.ReceiverContext(req.Context(), ar.config.Name(), "http", "")
// handle the request payload
err := ar.handleRequest(ctx, req)
if err != nil {
rw.WriteHeader(http.StatusBadRequest)
return
}
}
// Shutdown tells the receiver that should stop reception,
// giving it a chance to perform any necessary clean-up and shutting down
// its HTTP server.
func (ar *MockAwsXrayReceiver) Shutdown(context.Context) error {
var err = componenterror.ErrAlreadyStopped
ar.stopOnce.Do(func() {
err = ar.server.Close()
})
return err
}
func ToTraces(rawSeg []byte) (*pdata.Traces, error) {
var result map[string]interface{}
err := json.Unmarshal(rawSeg, &result)
if err != nil {
return nil, err
}
records, ok := result["TraceSegmentDocuments"].([]interface{})
if !ok {
panic("Not a slice")
}
traceData := pdata.NewTraces()
rspanSlice := traceData.ResourceSpans()
rspanSlice.Resize(1) // initialize a new empty pdata.ResourceSpans
rspan := rspanSlice.At(0) // retrieve the empty pdata.ResourceSpans we just created
rspan.InstrumentationLibrarySpans().Resize(1)
ils := rspan.InstrumentationLibrarySpans().At(0)
ils.Spans().Resize(len(records))
return &traceData, nil
}