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// Copyright 2022 The OpenZipkin 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://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 grpc_test
import (
"context"
"errors"
"net"
"testing"
"github.com/onsi/ginkgo/v2"
"github.com/onsi/gomega"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"github.com/openzipkin/zipkin-go"
zipkingrpc "github.com/openzipkin/zipkin-go/middleware/grpc"
"github.com/openzipkin/zipkin-go/model"
"github.com/openzipkin/zipkin-go/propagation/b3"
service "github.com/openzipkin/zipkin-go/proto/testing"
"github.com/openzipkin/zipkin-go/reporter/recorder"
)
var (
serverIDGenerator *sequentialIDGenerator
serverReporter *recorder.ReporterRecorder
server *grpc.Server
serverAddr string
customServer *grpc.Server
customServerAddr string
)
func TestGrpc(t *testing.T) {
gomega.RegisterFailHandler(ginkgo.Fail)
ginkgo.RunSpecs(t, "Grpc Suite")
}
var _ = ginkgo.BeforeSuite(func() {
var (
err error
tracer *zipkin.Tracer
lis net.Listener
customLis net.Listener
)
serverReporter = recorder.NewReporter()
ep, _ := zipkin.NewEndpoint("grpcServer", "")
serverIDGenerator = newSequentialIDGenerator(0x1000000)
tracer, err = zipkin.NewTracer(
serverReporter, zipkin.WithLocalEndpoint(ep),
zipkin.WithIDGenerator(serverIDGenerator),
zipkin.WithSharedSpans(false),
)
gomega.Expect(tracer, err).ToNot(gomega.BeNil(), "failed to create Zipkin tracer")
lis, err = net.Listen("tcp", ":0")
gomega.Expect(lis, err).ToNot(gomega.BeNil(), "failed to listen to tcp port")
server = grpc.NewServer(grpc.StatsHandler(zipkingrpc.NewServerHandler(tracer)))
service.RegisterHelloServiceServer(server, &TestHelloService{})
go func() {
_ = server.Serve(lis)
}()
serverAddr = lis.Addr().String()
customLis, err = net.Listen("tcp", ":0")
gomega.Expect(customLis, err).ToNot(gomega.BeNil(), "failed to listen to tcp port")
tracer, err = zipkin.NewTracer(
serverReporter,
zipkin.WithLocalEndpoint(ep),
zipkin.WithIDGenerator(serverIDGenerator),
zipkin.WithSharedSpans(true),
)
gomega.Expect(tracer, err).ToNot(gomega.BeNil(), "failed to create Zipkin tracer")
customServer = grpc.NewServer(
grpc.StatsHandler(
zipkingrpc.NewServerHandler(
tracer, zipkingrpc.ServerTags(map[string]string{"default": "tag"}),
),
),
)
service.RegisterHelloServiceServer(customServer, &TestHelloService{})
go func() {
_ = customServer.Serve(customLis)
}()
customServerAddr = customLis.Addr().String()
})
var _ = ginkgo.AfterSuite(func() {
server.Stop()
customServer.Stop()
_ = serverReporter.Close()
})
type sequentialIDGenerator struct {
nextTraceID uint64
nextSpanID uint64
start uint64
}
func newSequentialIDGenerator(start uint64) *sequentialIDGenerator {
return &sequentialIDGenerator{start, start, start}
}
func (g *sequentialIDGenerator) SpanID(_ model.TraceID) model.ID {
id := model.ID(g.nextSpanID)
g.nextSpanID++
return id
}
func (g *sequentialIDGenerator) TraceID() model.TraceID {
id := model.TraceID{
High: 0,
Low: g.nextTraceID,
}
g.nextTraceID++
return id
}
func (g *sequentialIDGenerator) reset() {
g.nextTraceID = g.start
g.nextSpanID = g.start
}
type TestHelloService struct {
service.UnimplementedHelloServiceServer
}
func (s *TestHelloService) Hello(ctx context.Context, req *service.HelloRequest) (*service.HelloResponse, error) {
if req.Payload == "fail" {
return nil, status.Error(codes.Aborted, "fail")
}
resp := &service.HelloResponse{
Payload: "World",
Metadata: map[string]string{},
SpanContext: map[string]string{},
}
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, errors.New("could not parse incoming metadata")
}
for k := range md {
// Just append the first value for a key for simplicity since we don't use multi-value headers.
resp.GetMetadata()[k] = md[k][0]
}
span := zipkin.SpanFromContext(ctx)
if span != nil {
spanCtx := span.Context()
resp.GetSpanContext()[b3.SpanID] = spanCtx.ID.String()
resp.GetSpanContext()[b3.TraceID] = spanCtx.TraceID.String()
if spanCtx.ParentID != nil {
resp.GetSpanContext()[b3.ParentSpanID] = spanCtx.ParentID.String()
}
}
return resp, nil
}
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