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wrapper.go
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/
wrapper.go
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package wrapper
import (
"context"
"io"
"strings"
"time"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
jaeger "github.com/uber/jaeger-client-go"
jaegercfg "github.com/uber/jaeger-client-go/config"
"google.golang.org/grpc"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/metadata"
)
//MDReaderWriter metadata Reader and Writer
type MDReaderWriter struct {
metadata.MD
}
// ForeachKey implements ForeachKey of opentracing.TextMapReader
func (c MDReaderWriter) ForeachKey(handler func(key, val string) error) error {
for k, vs := range c.MD {
for _, v := range vs {
if err := handler(k, v); err != nil {
return err
}
}
}
return nil
}
// Set implements Set() of opentracing.TextMapWriter
func (c MDReaderWriter) Set(key, val string) {
key = strings.ToLower(key)
c.MD[key] = append(c.MD[key], val)
}
// NewJaegerTracer NewJaegerTracer for current service
func NewJaegerTracer(serviceName string, jagentHost string) (tracer opentracing.Tracer, closer io.Closer, err error) {
jcfg := jaegercfg.Configuration{
Sampler: &jaegercfg.SamplerConfig{
Type: "const",
Param: 1,
},
Reporter: &jaegercfg.ReporterConfig{
LogSpans: true,
BufferFlushInterval: 1 * time.Second,
LocalAgentHostPort: jagentHost,
},
}
tracer, closer, err = jcfg.New(
serviceName,
jaegercfg.Logger(jaeger.StdLogger),
)
if err != nil {
return
}
opentracing.SetGlobalTracer(tracer)
return
}
// DialOption grpc client option
func DialOption(tracer opentracing.Tracer) grpc.DialOption {
return grpc.WithUnaryInterceptor(ClientInterceptor(tracer))
}
// ServerOption grpc server option
func ServerOption(tracer opentracing.Tracer) grpc.ServerOption {
return grpc.UnaryInterceptor(ServerInterceptor(tracer))
}
// ClientInterceptor grpc client wrapper
func ClientInterceptor(tracer opentracing.Tracer) grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string,
req, reply interface{}, cc *grpc.ClientConn,
invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
var parentCtx opentracing.SpanContext
parentSpan := opentracing.SpanFromContext(ctx)
if parentSpan != nil {
parentCtx = parentSpan.Context()
}
span := tracer.StartSpan(
method,
opentracing.ChildOf(parentCtx),
opentracing.Tag{Key: string(ext.Component), Value: "gRPC"},
ext.SpanKindRPCClient,
)
defer span.Finish()
md, ok := metadata.FromOutgoingContext(ctx)
if !ok {
md = metadata.New(nil)
} else {
md = md.Copy()
}
mdWriter := MDReaderWriter{md}
err := tracer.Inject(span.Context(), opentracing.TextMap, mdWriter)
if err != nil {
span.LogFields(log.String("inject-error", err.Error()))
}
newCtx := metadata.NewOutgoingContext(ctx, md)
err = invoker(newCtx, method, req, reply, cc, opts...)
if err != nil {
span.LogFields(log.String("call-error", err.Error()))
}
return err
}
}
// ServerInterceptor grpc server wrapper
func ServerInterceptor(tracer opentracing.Tracer) grpc.UnaryServerInterceptor {
return func(ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler) (resp interface{}, err error) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
spanContext, err := tracer.Extract(opentracing.TextMap, MDReaderWriter{md})
if err != nil && err != opentracing.ErrSpanContextNotFound {
grpclog.Errorf("extract from metadata err: %v", err)
} else {
span := tracer.StartSpan(
info.FullMethod,
ext.RPCServerOption(spanContext),
opentracing.Tag{Key: string(ext.Component), Value: "gRPC"},
ext.SpanKindRPCServer,
)
defer span.Finish()
ctx = opentracing.ContextWithSpan(ctx, span)
}
return handler(ctx, req)
}
}