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package grpc_test
import (
"context"
"errors"
"net"
"testing"
"github.com/onsi/ginkgo"
"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
serverReporter = recorder.NewReporter()
ep, _ := zipkin.NewEndpoint("grpcServer", "")
serverIdGenerator = newSequentialIdGenerator(0x1000000)
tracer, err := zipkin.NewTracer(
serverReporter, zipkin.WithLocalEndpoint(ep), zipkin.WithIDGenerator(serverIdGenerator), zipkin.WithSharedSpans(false))
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))
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(traceID 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{}
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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