OpenTelemetry-2.Go接入Jaeger（grpc，gin-http）

目录

1.什么是OpenTelemetry

2.搭建jaeger

3.链路追踪

本地调用

远程调用

GRPC

proto

server端

client端

Gin-HTTP

调用流程

api1

api2

grpc

4.完整代码

1.什么是OpenTelemetry

参考：OpenTelemetry-1.介绍-CSDN博客

2.搭建jaeger

参考：Jaeger分布式链路追踪工具-CSDN博客

3.链路追踪

本地调用

package main

import (
	"context"
	"log"
	"time"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
)

const (
	service     = "local"
	environment = "dev"
	id          = 1
)

// tracerProvider returns an OpenTelemetry TracerProvider configured to use
// the Jaeger exporter that will send spans to the provided url. The returned
// TracerProvider will also use a Resource configured with all the information
// about the application.
func tracerProvider(url string) (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithBatcher(exp),
		// Record information about this application in a Resource.
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		)),
	)
	return tp, nil
}

func main() {
	tp, err := tracerProvider("http://10.128.175.196:14268/api/traces")
	if err != nil {
		log.Fatal(err)
	}

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Cleanly shutdown and flush telemetry when the application exits.
	defer func(ctx context.Context) {
		// Do not make the application hang when it is shutdown.
		ctx, cancel = context.WithTimeout(ctx, time.Second*5)
		defer cancel()
		if err := tp.Shutdown(ctx); err != nil {
			log.Fatal(err)
		}
	}(ctx)

	tr := tp.Tracer("component-main")

	ctx, span := tr.Start(ctx, "foo")
	defer span.End()

	bar(ctx)
}

func bar(ctx context.Context) {
	// Use the global TracerProvider.
	tr := otel.Tracer("component-bar")
	_, span := tr.Start(ctx, "bar")
	span.SetAttributes(attribute.Key("testset").String("value"))
	defer span.End()

	// Do bar...
}

 参考：opentelemetry-go/example/jaeger/main.go at v1.16.0 · open-telemetry/opentelemetry-go · GitHub

远程调用

grpc

proto
syntax = "proto3"; // 指定proto版本
package hello_grpc;     // 指定默认包名

// 指定golang包名
option go_package = "/hello_grpc";

//定义rpc服务
service HelloService {
  // 定义函数
  rpc SayHello (HelloRequest) returns (HelloResponse) {}
}

// HelloRequest 请求内容
message HelloRequest {
  string name = 1;
  string message = 2;
}

// HelloResponse 响应内容
message HelloResponse{
  string name = 1;
  string message = 2;
}
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// 	protoc-gen-go v1.33.0
// 	protoc        v3.9.0
// source: grpc_proto/hello.proto

package hello_grpc

import (
	context "context"
	grpc "google.golang.org/grpc"
	codes "google.golang.org/grpc/codes"
	status "google.golang.org/grpc/status"
	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
	reflect "reflect"
	sync "sync"
)

const (
	// Verify that this generated code is sufficiently up-to-date.
	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
	// Verify that runtime/protoimpl is sufficiently up-to-date.
	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)

// HelloRequest 请求内容
type HelloRequest struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
}

func (x *HelloRequest) Reset() {
	*x = HelloRequest{}
	if protoimpl.UnsafeEnabled {
		mi := &file_grpc_proto_hello_proto_msgTypes[0]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *HelloRequest) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*HelloRequest) ProtoMessage() {}

func (x *HelloRequest) ProtoReflect() protoreflect.Message {
	mi := &file_grpc_proto_hello_proto_msgTypes[0]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use HelloRequest.ProtoReflect.Descriptor instead.
func (*HelloRequest) Descriptor() ([]byte, []int) {
	return file_grpc_proto_hello_proto_rawDescGZIP(), []int{0}
}

func (x *HelloRequest) GetName() string {
	if x != nil {
		return x.Name
	}
	return ""
}

func (x *HelloRequest) GetMessage() string {
	if x != nil {
		return x.Message
	}
	return ""
}

// HelloResponse 响应内容
type HelloResponse struct {
	state         protoimpl.MessageState
	sizeCache     protoimpl.SizeCache
	unknownFields protoimpl.UnknownFields

	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
}

func (x *HelloResponse) Reset() {
	*x = HelloResponse{}
	if protoimpl.UnsafeEnabled {
		mi := &file_grpc_proto_hello_proto_msgTypes[1]
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		ms.StoreMessageInfo(mi)
	}
}

func (x *HelloResponse) String() string {
	return protoimpl.X.MessageStringOf(x)
}

func (*HelloResponse) ProtoMessage() {}

func (x *HelloResponse) ProtoReflect() protoreflect.Message {
	mi := &file_grpc_proto_hello_proto_msgTypes[1]
	if protoimpl.UnsafeEnabled && x != nil {
		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
		if ms.LoadMessageInfo() == nil {
			ms.StoreMessageInfo(mi)
		}
		return ms
	}
	return mi.MessageOf(x)
}

// Deprecated: Use HelloResponse.ProtoReflect.Descriptor instead.
func (*HelloResponse) Descriptor() ([]byte, []int) {
	return file_grpc_proto_hello_proto_rawDescGZIP(), []int{1}
}

func (x *HelloResponse) GetName() string {
	if x != nil {
		return x.Name
	}
	return ""
}

func (x *HelloResponse) GetMessage() string {
	if x != nil {
		return x.Message
	}
	return ""
}

var File_grpc_proto_hello_proto protoreflect.FileDescriptor

var file_grpc_proto_hello_proto_rawDesc = []byte{
	0x0a, 0x16, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x68, 0x65, 0x6c,
	0x6c, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0a, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x5f,
	0x67, 0x72, 0x70, 0x63, 0x22, 0x3c, 0x0a, 0x0c, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x71,
	0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01,
	0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x18, 0x0a, 0x07, 0x6d, 0x65, 0x73, 0x73,
	0x61, 0x67, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x6d, 0x65, 0x73, 0x73, 0x61,
	0x67, 0x65, 0x22, 0x3d, 0x0a, 0x0d, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x73, 0x70, 0x6f,
	0x6e, 0x73, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28,
	0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x18, 0x0a, 0x07, 0x6d, 0x65, 0x73, 0x73, 0x61,
	0x67, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67,
	0x65, 0x32, 0x51, 0x0a, 0x0c, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63,
	0x65, 0x12, 0x41, 0x0a, 0x08, 0x53, 0x61, 0x79, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x12, 0x18, 0x2e,
	0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x5f, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x48, 0x65, 0x6c, 0x6c, 0x6f,
	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x19, 0x2e, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x5f,
	0x67, 0x72, 0x70, 0x63, 0x2e, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e,
	0x73, 0x65, 0x22, 0x00, 0x42, 0x0d, 0x5a, 0x0b, 0x2f, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x5f, 0x67,
	0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}

var (
	file_grpc_proto_hello_proto_rawDescOnce sync.Once
	file_grpc_proto_hello_proto_rawDescData = file_grpc_proto_hello_proto_rawDesc
)

func file_grpc_proto_hello_proto_rawDescGZIP() []byte {
	file_grpc_proto_hello_proto_rawDescOnce.Do(func() {
		file_grpc_proto_hello_proto_rawDescData = protoimpl.X.CompressGZIP(file_grpc_proto_hello_proto_rawDescData)
	})
	return file_grpc_proto_hello_proto_rawDescData
}

var file_grpc_proto_hello_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_grpc_proto_hello_proto_goTypes = []interface{}{
	(*HelloRequest)(nil),  // 0: hello_grpc.HelloRequest
	(*HelloResponse)(nil), // 1: hello_grpc.HelloResponse
}
var file_grpc_proto_hello_proto_depIdxs = []int32{
	0, // 0: hello_grpc.HelloService.SayHello:input_type -> hello_grpc.HelloRequest
	1, // 1: hello_grpc.HelloService.SayHello:output_type -> hello_grpc.HelloResponse
	1, // [1:2] is the sub-list for method output_type
	0, // [0:1] is the sub-list for method input_type
	0, // [0:0] is the sub-list for extension type_name
	0, // [0:0] is the sub-list for extension extendee
	0, // [0:0] is the sub-list for field type_name
}

func init() { file_grpc_proto_hello_proto_init() }
func file_grpc_proto_hello_proto_init() {
	if File_grpc_proto_hello_proto != nil {
		return
	}
	if !protoimpl.UnsafeEnabled {
		file_grpc_proto_hello_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*HelloRequest); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
		file_grpc_proto_hello_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
			switch v := v.(*HelloResponse); i {
			case 0:
				return &v.state
			case 1:
				return &v.sizeCache
			case 2:
				return &v.unknownFields
			default:
				return nil
			}
		}
	}
	type x struct{}
	out := protoimpl.TypeBuilder{
		File: protoimpl.DescBuilder{
			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
			RawDescriptor: file_grpc_proto_hello_proto_rawDesc,
			NumEnums:      0,
			NumMessages:   2,
			NumExtensions: 0,
			NumServices:   1,
		},
		GoTypes:           file_grpc_proto_hello_proto_goTypes,
		DependencyIndexes: file_grpc_proto_hello_proto_depIdxs,
		MessageInfos:      file_grpc_proto_hello_proto_msgTypes,
	}.Build()
	File_grpc_proto_hello_proto = out.File
	file_grpc_proto_hello_proto_rawDesc = nil
	file_grpc_proto_hello_proto_goTypes = nil
	file_grpc_proto_hello_proto_depIdxs = nil
}

// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ grpc.ClientConnInterface

// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
const _ = grpc.SupportPackageIsVersion6

// HelloServiceClient is the client API for HelloService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type HelloServiceClient interface {
	// 定义函数
	SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloResponse, error)
}

type helloServiceClient struct {
	cc grpc.ClientConnInterface
}

func NewHelloServiceClient(cc grpc.ClientConnInterface) HelloServiceClient {
	return &helloServiceClient{cc}
}

func (c *helloServiceClient) SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloResponse, error) {
	out := new(HelloResponse)
	err := c.cc.Invoke(ctx, "/hello_grpc.HelloService/SayHello", in, out, opts...)
	if err != nil {
		return nil, err
	}
	return out, nil
}

// HelloServiceServer is the server API for HelloService service.
type HelloServiceServer interface {
	// 定义函数
	SayHello(context.Context, *HelloRequest) (*HelloResponse, error)
}

// UnimplementedHelloServiceServer can be embedded to have forward compatible implementations.
type UnimplementedHelloServiceServer struct {
}

func (*UnimplementedHelloServiceServer) SayHello(context.Context, *HelloRequest) (*HelloResponse, error) {
	return nil, status.Errorf(codes.Unimplemented, "method SayHello not implemented")
}

func RegisterHelloServiceServer(s *grpc.Server, srv HelloServiceServer) {
	s.RegisterService(&_HelloService_serviceDesc, srv)
}

func _HelloService_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
	in := new(HelloRequest)
	if err := dec(in); err != nil {
		return nil, err
	}
	if interceptor == nil {
		return srv.(HelloServiceServer).SayHello(ctx, in)
	}
	info := &grpc.UnaryServerInfo{
		Server:     srv,
		FullMethod: "/hello_grpc.HelloService/SayHello",
	}
	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
		return srv.(HelloServiceServer).SayHello(ctx, req.(*HelloRequest))
	}
	return interceptor(ctx, in, info, handler)
}

var _HelloService_serviceDesc = grpc.ServiceDesc{
	ServiceName: "hello_grpc.HelloService",
	HandlerType: (*HelloServiceServer)(nil),
	Methods: []grpc.MethodDesc{
		{
			MethodName: "SayHello",
			Handler:    _HelloService_SayHello_Handler,
		},
	},
	Streams:  []grpc.StreamDesc{},
	Metadata: "grpc_proto/hello.proto",
}
server端
package main

import (
	"context"
	"fmt"
	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
	"go_otel/2go_grpc/grpc_proto/hello_grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/grpclog"
	"log"
	"net"
)

const (
	service     = "grpc_server"
	environment = "dev"
	id          = 2
)

var tracer = otel.Tracer(service)

// HelloServer 得有一个结构体，需要实现这个服务的全部方法,叫什么名字不重要
type HelloServer struct {
}

func (HelloServer) SayHello(ctx context.Context, request *hello_grpc.HelloRequest) (*hello_grpc.HelloResponse, error) {
	fmt.Println("入参：", request.Name, request.Message)

	_, span := tracer.Start(ctx, "grpc")
	span.SetAttributes(attribute.Key("request.Name").String(request.Name))
	span.SetAttributes(attribute.Key("request.Message").String(request.Message))
	defer span.End()

	return &hello_grpc.HelloResponse{
		Name:    "server",
		Message: "hello " + request.Name,
	}, nil
}

func tracerProvider() (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint("http://10.128.175.196:14268/api/traces")))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithSampler(tracesdk.AlwaysSample()),
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		),
		),
	)

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

	return tp, nil
}

func main() {
	tp, err := tracerProvider()
	if err != nil {
		log.Fatal(err)
	}

	// Cleanly shutdown and flush telemetry when the application exits.
	defer func() {
		if err := tp.Shutdown(context.Background()); err != nil {
			log.Fatal(err)
		}
	}()

	// grpc
	listen, err := net.Listen("tcp", ":8080")
	if err != nil {
		grpclog.Fatalf("Failed to listen: %v", err)
	}

	// 创建一个gRPC服务器实例。
	s := grpc.NewServer(
		//引入grpc-middleware定义的拦截器
		grpc.ChainUnaryInterceptor(
			//openTelemetry 链路追踪
			otelgrpc.UnaryServerInterceptor(otelgrpc.WithTracerProvider(tp)),
		),
	)
	server := HelloServer{}
	// 将server结构体注册为gRPC服务。
	hello_grpc.RegisterHelloServiceServer(s, &server)
	fmt.Println("grpc server running :8080")
	// 开始处理客户端请求。
	err = s.Serve(listen)
}
client端
package main

import (
	"context"
	"fmt"
	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	"go.opentelemetry.io/otel/semconv/v1.17.0"
	"go_otel/2go_grpc/grpc_proto/hello_grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"log"
	"os"
	"time"
)

const (
	service     = "grpc_client"
	environment = "dev"
	id          = 2
)

func tracerProvider() (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint("http://10.128.175.196:14268/api/traces")))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithSampler(tracesdk.AlwaysSample()),
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		),
		),
	)

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

	return tp, nil
}

func main() {
	//创建traceProvider
	tp, err := tracerProvider()
	if err != nil {
		fmt.Println("NewTracerProvider err:", err)
		os.Exit(1)
	}
	conn, err := grpc.Dial("localhost:8080", grpc.WithTransportCredentials(insecure.NewCredentials()),
		//Unary拦截器
		grpc.WithChainUnaryInterceptor(
			//openTelemetry 链路追踪
			otelgrpc.UnaryClientInterceptor(otelgrpc.WithTracerProvider(tp)),
		),
		//Stream拦截器
		grpc.WithChainStreamInterceptor(func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
			// Pre-processing logic
			s := time.Now()
			cs, err := streamer(ctx, desc, cc, method, opts...)
			// Post-processing logic
			log.Printf("method: %s, latency: %s\n", method, time.Now().Sub(s))
			return cs, err
		}),
	)

	defer func() {
		println("关闭TracerProvider。所有注册的跨度处理器都会按照它们注册的顺序关闭，并释放所有持有的计算资源。")
		if err := tp.Shutdown(context.Background()); err != nil {
			panic(err)
		}
	}()
	if err != nil {
		log.Fatalf("connection failed,err:%s", err)
	}

	// 初始化客户端
	client := hello_grpc.NewHelloServiceClient(conn)
	result, err := client.SayHello(context.Background(), &hello_grpc.HelloRequest{
		Name:    "client",
		Message: "hello",
	})
	fmt.Println(result, err)

}

gin-http

调用流程

api1 ----> api2 ----> grpc

api1
package main

import (
	"context"
	"fmt"
	"github.com/gin-gonic/gin"
	"go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/codes"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
	oteltrace "go.opentelemetry.io/otel/trace"
	"log"
	"net/http"

	modahttp "github.com/webws/go-moda/transport/http"
)

const (
	service     = "api1"
	environment = "dev"
	id          = 3
)

var tracer = otel.Tracer(service)

func tracerProvider() (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint("http://10.128.175.196:14268/api/traces")))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithSampler(tracesdk.AlwaysSample()),
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		),
		),
	)

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

	return tp, nil
}

func main() {
	tp, err := tracerProvider()
	if err != nil {
		log.Fatal(err)
	}

	// Cleanly shutdown and flush telemetry when the application exits.
	defer func() {
		if err := tp.Shutdown(context.Background()); err != nil {
			log.Fatal(err)
		}
	}()

	r := gin.New()
	r.Use(otelgin.Middleware("gin-api1"))
	loadRoutes(r)

	fmt.Println("api1 start 8081")
	r.Run(":8081")
}

func loadRoutes(r *gin.Engine) {
	r.GET("/ping", pingFunc)
}

func pingFunc(c *gin.Context) {

	tracerCtx, span := tracer.Start(c.Request.Context(), "pingFunc",
		oteltrace.WithAttributes(attribute.String("key-pingFunc", "val-pingFunc")))
	defer span.End()

	callApi2(tracerCtx)

	c.JSON(http.StatusOK, gin.H{
		"message": "pong",
	})
}

func callApi2(ctx context.Context) {
	// tracer
	fmt.Println("on callApi2")
	tracerCtx, span := tracer.Start(ctx, "callApi2")
	span.AddEvent("starting callApi2")
	span.SetAttributes(attribute.Key("key_callApi2").String("value_callApi2"))
	defer span.End()
	// 打印TraceID SpanID
	spanCtx := oteltrace.SpanContextFromContext(ctx)
	fmt.Println(spanCtx.TraceID())
	fmt.Println(spanCtx.SpanID())

	// 调用api2
	url := fmt.Sprintf("http://localhost:8082/ping")
	defer span.End()

	_, err := modahttp.CallAPI(tracerCtx, url, "GET", nil)
	if err != nil {
		fmt.Printf("call api2 error: %v", err)
		span.SetStatus(codes.Error, err.Error())
	}
}
api2
package main

import (
	"context"
	"fmt"
	"github.com/gin-gonic/gin"
	"go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
	oteltrace "go.opentelemetry.io/otel/trace"
	"go_otel/3Gin-HTTP/grpc/grpc_proto/hello_grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"log"
	"net/http"
)

const (
	service     = "api2"
	environment = "dev"
	id          = 2
)

var tracer = otel.Tracer(service)

func tracerProvider() (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint("http://10.128.175.196:14268/api/traces")))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithSampler(tracesdk.AlwaysSample()),
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		),
		),
	)

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

	return tp, nil
}

func main() {
	tp, err := tracerProvider()
	if err != nil {
		log.Fatal(err)
	}

	// Cleanly shutdown and flush telemetry when the application exits.
	defer func() {
		if err := tp.Shutdown(context.Background()); err != nil {
			log.Fatal(err)
		}
	}()

	r := gin.New()
	r.Use(otelgin.Middleware("gin-api2"))
	loadRoutes(r)

	fmt.Println("api2 start 8082")
	r.Run(":8082")
}

func loadRoutes(r *gin.Engine) {
	r.GET("/ping", pingFunc)
}

func pingFunc(c *gin.Context) {
	fmt.Println("on pingFunc")
	ctx, span := tracer.Start(c.Request.Context(), "pingFunc")
	defer span.End()

	callGrpc(ctx)

	c.JSON(http.StatusOK, gin.H{
		"message": "pong",
	})
}

func callGrpc(ctx context.Context) {
	fmt.Println("on callGrpc")
	ctx, span := tracer.Start(ctx, "callGrpc")
	defer span.End()
	// 打印TraceID SpanID
	spanCtx := oteltrace.SpanContextFromContext(ctx)
	fmt.Println(spanCtx.TraceID())
	fmt.Println(spanCtx.SpanID())

	// 连接服务器
	options := make([]grpc.DialOption, 0)
	options = append(options, grpc.WithTransportCredentials(insecure.NewCredentials()),
		grpc.WithUnaryInterceptor(otelgrpc.UnaryClientInterceptor()),
		grpc.WithStreamInterceptor(otelgrpc.StreamClientInterceptor()))
	conn, err := grpc.DialContext(ctx, "localhost:8083", options...)
	if err != nil {
		panic(err)
	}
	defer conn.Close()
	// 初始化客户端
	client := hello_grpc.NewHelloServiceClient(conn)
	result, err := client.SayHello(ctx, &hello_grpc.HelloRequest{
		Name:    "client",
		Message: "hello",
	})
	fmt.Println(result, err)
}
grpc
package main

import (
	"context"
	"fmt"
	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	tracesdk "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
	oteltrace "go.opentelemetry.io/otel/trace"
	"go_otel/3Gin-HTTP/grpc/grpc_proto/hello_grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/grpclog"
	"log"
	"net"
)

const (
	service     = "remote-grpc"
	environment = "dev"
	id          = 3
)

var tracer = otel.Tracer(service)

// HelloServer 得有一个结构体，需要实现这个服务的全部方法,叫什么名字不重要
type HelloServer struct {
}

func (HelloServer) SayHello(ctx context.Context, request *hello_grpc.HelloRequest) (*hello_grpc.HelloResponse, error) {

	fmt.Println("on grpc SayHello")
	_, span := tracer.Start(ctx, "SayHello",
		oteltrace.WithAttributes(attribute.String("key-pingFunc", "val-pingFunc")))
	defer span.End()
	spanCtx := oteltrace.SpanContextFromContext(ctx)
	fmt.Println(spanCtx.SpanID())
	fmt.Println(spanCtx.TraceID())

	fmt.Println("入参：", request.Name, request.Message)
	return &hello_grpc.HelloResponse{
		Name:    "server",
		Message: "hello " + request.Name,
	}, nil
}

func tracerProvider() (*tracesdk.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint("http://10.128.175.196:14268/api/traces")))
	if err != nil {
		return nil, err
	}
	tp := tracesdk.NewTracerProvider(
		// Always be sure to batch in production.
		tracesdk.WithSampler(tracesdk.AlwaysSample()),
		tracesdk.WithBatcher(exp),
		tracesdk.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceName(service),
			attribute.String("environment", environment),
			attribute.Int64("ID", id),
		),
		),
	)

	// Register our TracerProvider as the global so any imported
	// instrumentation in the future will default to using it.
	otel.SetTracerProvider(tp)
	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

	return tp, nil
}

func main() {

	tp, err := tracerProvider()
	if err != nil {
		log.Fatal(err)
	}

	// Cleanly shutdown and flush telemetry when the application exits.
	defer func() {
		if err := tp.Shutdown(context.Background()); err != nil {
			log.Fatal(err)
		}
	}()

	// grpc
	fmt.Println("grpc start 8083")
	listen, err := net.Listen("tcp", ":8083")
	if err != nil {
		grpclog.Fatalf("Failed to listen: %v", err)
	}

	// 创建一个gRPC服务器实例。
	// 添加拦截器(grpc集成OpenTelemetry主要是调用(otelgrpc.UnaryServerInterceptor())
	s := grpc.NewServer(grpc.UnaryInterceptor(otelgrpc.UnaryServerInterceptor()))
	server := HelloServer{}
	// 将server结构体注册为gRPC服务。
	hello_grpc.RegisterHelloServiceServer(s, &server)
	// 开始处理客户端请求。
	err = s.Serve(listen)
}

4.完整代码

go_opentelemetry_study: Golang使用OpenTelemetry

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