adjust trace middleware and fix blog's trace middleware use case (#791)

* middleware: adjust trace middleware

* examples: fix blog's trace middleware use case

examples/blog/cmd/blog/main.go

@@ -2,9 +2,9 @@ package main
 
 import (
 	"flag"
-	"os"
-
 	"go.opentelemetry.io/otel/exporters/trace/jaeger"
+	"go.opentelemetry.io/otel/sdk/trace"
+	"os"
 
 	"github.com/go-kratos/kratos/examples/blog/internal/conf"
 	"github.com/go-kratos/kratos/v2"
@@ -13,8 +13,6 @@ import (
 	"github.com/go-kratos/kratos/v2/log"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
-	"go.opentelemetry.io/otel/label"
-	"go.opentelemetry.io/otel/sdk/trace"
 	"gopkg.in/yaml.v2"
 )
 
@@ -45,26 +43,6 @@ func newApp(logger log.Logger, hs *http.Server, gs *grpc.Server) *kratos.App {
 	)
 }
 
-// todo: move to wire DI
-func newTracer() func() {
-	// Create and install Jaeger export pipeline.
-	flush, err := jaeger.InstallNewPipeline(
-		jaeger.WithCollectorEndpoint("http://localhost:14268/api/traces"),
-		jaeger.WithProcess(jaeger.Process{
-			ServiceName: "trace-demo",
-			Tags: []label.KeyValue{
-				label.String("exporter", "jaeger"),
-				label.Float64("float", 312.23),
-			},
-		}),
-		jaeger.WithSDK(&trace.Config{DefaultSampler: trace.AlwaysSample()}),
-	)
-	if err != nil {
-		panic(err)
-	}
-	return flush
-}
-
 func main() {
 	flag.Parse()
 	logger := log.NewStdLogger(os.Stdout)
@@ -86,10 +64,18 @@ func main() {
 		panic(err)
 	}
 
-	flush := newTracer()
+	tp, flush, err := jaeger.NewExportPipeline(jaeger.WithCollectorEndpoint("http://localhost:14268/api/traces"),
+		jaeger.WithProcess(jaeger.Process{
+			ServiceName: "blog",
+		}),
+		jaeger.WithSDK(&trace.Config{DefaultSampler: trace.AlwaysSample()}),
+	)
+	if err != nil {
+		panic(err)
+	}
 	defer flush()
 
-	app, err := initApp(bc.Server, bc.Data, logger)
+	app, err := initApp(bc.Server, bc.Data, tp, logger)
 	if err != nil {
 		panic(err)
 	}

examples/blog/cmd/blog/wire.go

@@ -13,9 +13,10 @@ import (
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/log"
 	"github.com/google/wire"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // initApp init kratos application.
-func initApp(*conf.Server, *conf.Data, log.Logger) (*kratos.App, error) {
+func initApp(*conf.Server, *conf.Data, trace.TracerProvider, log.Logger) (*kratos.App, error) {
 	panic(wire.Build(server.ProviderSet, data.ProviderSet, biz.ProviderSet, service.ProviderSet, newApp))
 }

examples/blog/cmd/blog/wire_gen.go

@@ -13,12 +13,13 @@ import (
 	"github.com/go-kratos/kratos/examples/blog/internal/service"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/log"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // Injectors from wire.go:
 
 // initApp init kratos application.
-func initApp(confServer *conf.Server, confData *conf.Data, logger log.Logger) (*kratos.App, error) {
+func initApp(confServer *conf.Server, confData *conf.Data, tracerProvider trace.TracerProvider, logger log.Logger) (*kratos.App, error) {
 	dataData, err := data.NewData(confData, logger)
 	if err != nil {
 		return nil, err
@@ -26,8 +27,8 @@ func initApp(confServer *conf.Server, confData *conf.Data, logger log.Logger) (*
 	articleRepo := data.NewArticleRepo(dataData, logger)
 	articleUsecase := biz.NewArticleUsecase(articleRepo, logger)
 	blogService := service.NewBlogService(articleUsecase, logger)
-	httpServer := server.NewHTTPServer(confServer, blogService)
+	httpServer := server.NewHTTPServer(confServer, tracerProvider, blogService)
-	grpcServer := server.NewGRPCServer(confServer, blogService)
+	grpcServer := server.NewGRPCServer(confServer, tracerProvider, blogService)
 	app := newApp(logger, httpServer, grpcServer)
 	return app, nil
 }

examples/blog/internal/server/grpc.go

@@ -10,16 +10,17 @@ import (
 	"github.com/go-kratos/kratos/v2/middleware/status"
 	"github.com/go-kratos/kratos/v2/middleware/tracing"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // NewGRPCServer new a gRPC server.
-func NewGRPCServer(c *conf.Server, blog *service.BlogService) *grpc.Server {
+func NewGRPCServer(c *conf.Server, tracer trace.TracerProvider, blog *service.BlogService) *grpc.Server {
 	var opts = []grpc.ServerOption{
 		grpc.Middleware(
 			middleware.Chain(
 				recovery.Recovery(),
 				status.Server(),
-				tracing.Server(),
+				tracing.Server(tracing.WithTracerProvider(tracer)),
 				logging.Server(),
 			),
 		),

examples/blog/internal/server/http.go

@@ -9,11 +9,12 @@ import (
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/middleware/tracing"
 	"github.com/go-kratos/kratos/v2/transport/http"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // NewHTTPServer new a HTTP server.
-func NewHTTPServer(c *conf.Server, blog *service.BlogService) *http.Server {
+func NewHTTPServer(c *conf.Server, tracer trace.TracerProvider, blog *service.BlogService) *http.Server {
-	var opts = []http.ServerOption{}
+	var opts []http.ServerOption
 	if c.Http.Network != "" {
 		opts = append(opts, http.Network(c.Http.Network))
 	}
@@ -26,7 +27,7 @@ func NewHTTPServer(c *conf.Server, blog *service.BlogService) *http.Server {
 	m := http.Middleware(
 		middleware.Chain(
 			recovery.Recovery(),
-			tracing.Server(),
+			tracing.Server(tracing.WithTracerProvider(tracer)),
 			logging.Server(),
 		),
 	)

examples/go.mod

@@ -6,11 +6,11 @@ require (
 	entgo.io/ent v0.6.0
 	github.com/gin-gonic/gin v1.6.3
 	github.com/go-kratos/consul v0.0.0-20210311161349-cfb0345e820d
-	github.com/go-kratos/etcd v0.0.0-20210311152824-df5743ff1a11
+	github.com/go-kratos/etcd v0.0.0-20210311162832-e0fdc8177742
-	github.com/go-kratos/kratos/v2 v2.0.0-20210315090606-74272546caa6
+	github.com/go-kratos/kratos/v2 v2.0.0-20210318080319-db98d59b11bb
 	github.com/go-playground/validator/v10 v10.4.1 // indirect
-	github.com/go-redis/redis/extra/redisotel v0.2.0
+	github.com/go-redis/redis/extra/redisotel v0.3.0
-	github.com/go-redis/redis/v8 v8.6.0
+	github.com/go-redis/redis/v8 v8.7.1
 	github.com/go-sql-driver/mysql v1.5.1-0.20200311113236-681ffa848bae
 	github.com/golang/protobuf v1.4.3
 	github.com/google/wire v0.5.0
@@ -22,10 +22,10 @@ require (
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/ugorji/go v1.2.3 // indirect
 	go.etcd.io/etcd/client/v3 v3.5.0-alpha.0
-	go.opentelemetry.io/otel v0.17.0
+	go.opentelemetry.io/otel v0.18.0
-	go.opentelemetry.io/otel/exporters/trace/jaeger v0.17.0
+	go.opentelemetry.io/otel/exporters/trace/jaeger v0.18.0
-	go.opentelemetry.io/otel/sdk v0.17.0
+	go.opentelemetry.io/otel/sdk v0.18.0
-	go.opentelemetry.io/otel/trace v0.17.0
+	go.opentelemetry.io/otel/trace v0.18.0
 	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 // indirect
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect

examples/go.sum

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@@ -165,6 +210,7 @@ github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFU
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@@ -195,9 +241,12 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -207,8 +256,11 @@ github.com/google/pprof v0.0.0-20200229191704-1ebb73c60ed3/go.mod h1:ZgVRPoUq/hf
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@@ -248,6 +306,7 @@ github.com/hashicorp/go-msgpack v0.5.3/go.mod h1:ahLV/dePpqEmjfWmKiqvPkv/twdG7iP
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@@ -255,18 +314,23 @@ github.com/hashicorp/go-rootcerts v1.0.2/go.mod h1:pqUvnprVnM5bf7AOirdbb01K4ccR3
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@@ -274,32 +338,45 @@ github.com/hashicorp/memberlist v0.2.2/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOn
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@@ -436,11 +551,14 @@ github.com/ugorji/go v1.2.3/go.mod h1:5l8GZ8hZvmL4uMdy+mhCO1LjswGRYco9Q3HfuisB21
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 github.com/ugorji/go/codec v1.2.3 h1:/mVYEV+Jo3IZKeA5gBngN0AvNnQltEDkR+eQikkWQu0=
 github.com/ugorji/go/codec v1.2.3/go.mod h1:5FxzDJIgeiWJZslYHPj+LS1dq1ZBQVelZFnjsFGI/Uc=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 h1:eY9dn8+vbi4tKz5Qo6v2eYzo7kUS51QINcR5jNpbZS8=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.2.1 h1:ruQGxdhGHe7FWOJPT0mKs5+pD2Xs1Bm/kdGlHO04FmM=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+go.etcd.io/bbolt v1.3.2 h1:Z/90sZLPOeCy2PwprqkFa25PdkusRzaj9P8zm/KNyvk=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/etcd/api/v3 v3.5.0-alpha.0 h1:+e5nrluATIy3GP53znpkHMFzPTHGYyzvJGFCbuI6ZLc=
 go.etcd.io/etcd/api/v3 v3.5.0-alpha.0/go.mod h1:mPcW6aZJukV6Aa81LSKpBjQXTWlXB5r74ymPoSWa3Sw=
@@ -454,27 +572,33 @@ go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
+go.opencensus.io v0.22.6 h1:BdkrbWrzDlV9dnbzoP7sfN+dHheJ4J9JOaYxcUDL+ok=
 go.opencensus.io v0.22.6/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
 go.opentelemetry.io/otel v0.13.0/go.mod h1:dlSNewoRYikTkotEnxdmuBHgzT+k/idJSfDv/FxEnOY=
-go.opentelemetry.io/otel v0.14.0/go.mod h1:vH5xEuwy7Rts0GNtsCW3HYQoZDY+OmBJ6t1bFGGlxgw=
+go.opentelemetry.io/otel v0.16.0/go.mod h1:e4GKElweB8W2gWUqbghw0B8t5MCTccc9212eNHnOHwA=
-go.opentelemetry.io/otel v0.17.0 h1:6MKOu8WY4hmfpQ4oQn34u6rYhnf2sWf1LXYO/UFm71U=
 go.opentelemetry.io/otel v0.17.0/go.mod h1:Oqtdxmf7UtEvL037ohlgnaYa1h7GtMh0NcSd9eqkC9s=
-go.opentelemetry.io/otel/exporters/trace/jaeger v0.17.0 h1:9Nivnf6Oqkm6P8o7LGJfQNjqP45O2FgDAQgLncy1pPM=
+go.opentelemetry.io/otel v0.18.0 h1:d5Of7+Zw4ANFOJB+TIn2K3QWsgS2Ht7OU9DqZHI6qu8=
-go.opentelemetry.io/otel/exporters/trace/jaeger v0.17.0/go.mod h1:PCzsDDOeNfZNiKfWMgL8jK3qodD147xu6n/DYvFFNdw=
+go.opentelemetry.io/otel v0.18.0/go.mod h1:PT5zQj4lTsR1YeARt8YNKcFb88/c2IKoSABK9mX0r78=
-go.opentelemetry.io/otel/metric v0.17.0 h1:t+5EioN8YFXQ2EH+1j6FHCKMUj+57zIDSnSGr/mWuug=
+go.opentelemetry.io/otel/exporters/trace/jaeger v0.18.0 h1:ypDeiBo+6UnLiuERzboaBG2K+TKkocr02CZ6A+HBWdg=
+go.opentelemetry.io/otel/exporters/trace/jaeger v0.18.0/go.mod h1:4CNKanPlRgD52TO4OQ8bgSsh2ks8wLLDzykLQQNju6E=
 go.opentelemetry.io/otel/metric v0.17.0/go.mod h1:hUz9lH1rNXyEwWAhIWCMFWKhYtpASgSnObJFnU26dJ0=
-go.opentelemetry.io/otel/oteltest v0.17.0 h1:TyAihUowTDLqb4+m5ePAsR71xPJaTBJl4KDArIdi9k4=
+go.opentelemetry.io/otel/metric v0.18.0 h1:yuZCmY9e1ZTaMlZXLrrbAPmYW6tW1A5ozOZeOYGaTaY=
+go.opentelemetry.io/otel/metric v0.18.0/go.mod h1:kEH2QtzAyBy3xDVQfGZKIcok4ZZFvd5xyKPfPcuK6pE=
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-go.opentelemetry.io/otel/sdk v0.17.0 h1:eHXQwanmbtSHM/GcJYbJ8FyyH/sT9a0e+1Z9ZWkF7Ug=
+go.opentelemetry.io/otel/oteltest v0.18.0 h1:FbKDFm/LnQDOHuGjED+fy3s5YMVg0z019GJ9Er66hYo=
-go.opentelemetry.io/otel/sdk v0.17.0/go.mod h1:INs1PePjjF2hf842AXsxGTe5lH023QfLTZRFPiV/RUk=
+go.opentelemetry.io/otel/oteltest v0.18.0/go.mod h1:NyierCU3/G8DLTva7KRzGii2fdxdR89zXKH1bNWY7Bo=
-go.opentelemetry.io/otel/trace v0.17.0 h1:SBOj64/GAOyWzs5F680yW1ITIfJkm6cJWL2YAvuL9xY=
+go.opentelemetry.io/otel/sdk v0.18.0 h1:/UiFHiJxJyEoUN2tQ6l+5f0/P01V0G9YuHeVarktRDw=
+go.opentelemetry.io/otel/sdk v0.18.0/go.mod h1:nT+UdAeGQWSeTnz9vY8BBq7SEGpmWAetyo/xHUcQvxo=
 go.opentelemetry.io/otel/trace v0.17.0/go.mod h1:bIujpqg6ZL6xUTubIUgziI1jSaUPthmabA/ygf/6Cfg=
+go.opentelemetry.io/otel/trace v0.18.0 h1:ilCfc/fptVKaDMK1vWk0elxpolurJbEgey9J6g6s+wk=
+go.opentelemetry.io/otel/trace v0.18.0/go.mod h1:FzdUu3BPwZSZebfQ1vl5/tAa8LyMLXSJN57AXIt/iDk=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.6.0 h1:Ezj3JGmsOnG1MoRWQkPBsKLe9DwWD9QeXzTRzzldNVk=
 go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/multierr v1.5.0 h1:KCa4XfM8CWFCpxXRGok+Q0SS/0XBhMDbHHGABQLvD2A=
 go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKYU=
+go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee h1:0mgffUl7nfd+FpvXMVz4IDEaUSmT1ysygQC7qYo7sG4=
 go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.16.0 h1:uFRZXykJGK9lLY4HtgSw44DnIcAM+kRBP7x5m+NpAOM=
@@ -498,8 +622,10 @@ golang.org/x/exp v0.0.0-20191129062945-2f5052295587/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
+golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 h1:QE6XYQK6naiK1EPAe1g/ILLxN5RBoH5xkJk3CqlMI/Y=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/image v0.0.0-20190802002840-cff245a6509b h1:+qEpEAPhDZ1o0x3tHzZTQDArnOixOzGD9HUJfcg0mb4=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
@@ -511,8 +637,10 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
 golang.org/x/lint v0.0.0-20200130185559-910be7a94367/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
+golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 h1:2M3HP5CCK1Si9FQhwnzYhXdG6DXeebvUHFpre8QvbyI=
 golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
+golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028 h1:4+4C/Iv2U4fMZBiMCc98MG1In4gJY5YRhtpDNeDeHWs=
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
@@ -520,6 +648,7 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.4.0 h1:8pl+sMODzuvGJkmj2W4kZihvVb5mKm8pB/X44PIQHv8=
 golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -572,6 +701,7 @@ golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6/go.mod h1:gOpvHmFTYa4Iltr
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/oauth2 v0.0.0-20201109201403-9fd604954f58/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5 h1:Lm4OryKCca1vehdsWogr9N4t7NfZxLbJoc/H0w4K4S4=
 golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -639,6 +769,7 @@ golang.org/x/sys v0.0.0-20210228012217-479acdf4ea46/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210309074719-68d13333faf2 h1:46ULzRKLh1CwgRq2dC5SlBzEqqNCi8rreOZnNrbqcIY=
 golang.org/x/sys v0.0.0-20210309074719-68d13333faf2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -649,6 +780,7 @@ golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/time v0.0.0-20191024005414-555d28b269f0 h1:/5xXl8Y5W96D+TtHSlonuFqGHIWVuyCkGJLwGh9JJFs=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -704,6 +836,7 @@ golang.org/x/tools v0.0.0-20201201161351-ac6f37ff4c2a/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.0.0-20210105164027-a548c3f4af2d h1:v9TQ4+tS+0r4R+9E6svkcl6ocSxeHONeVkK2y6YhzmA=
 golang.org/x/tools v0.0.0-20210105164027-a548c3f4af2d/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -728,14 +861,15 @@ google.golang.org/api v0.29.0/go.mod h1:Lcubydp8VUV7KeIHD9z2Bys/sm/vGKnG1UHuDBSr
 google.golang.org/api v0.30.0/go.mod h1:QGmEvQ87FHZNiUVJkT14jQNYJ4ZJjdRF23ZXz5138Fc=
 google.golang.org/api v0.35.0/go.mod h1:/XrVsuzM0rZmrsbjJutiuftIzeuTQcEeaYcSk/mQ1dg=
 google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34qYtE=
-google.golang.org/api v0.39.0 h1:zHCTXf0NeDdKTgcSQpT+ZflWAqHsEp1GmdpxW09f3YM=
+google.golang.org/api v0.40.0 h1:uWrpz12dpVPn7cojP82mk02XDgTJLDPc2KbVTxrWb4A=
-google.golang.org/api v0.39.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
+google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
+google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
 google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
@@ -806,15 +940,20 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.25.1-0.20200805231151-a709e31e5d12 h1:OwhZOOMuf7leLaSCuxtQ9FW7ui2L2L6UKOtKAUqovUQ=
 google.golang.org/protobuf v1.25.1-0.20200805231151-a709e31e5d12/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/errgo.v2 v2.1.0 h1:0vLT13EuvQ0hNvakwLuFZ/jYrLp5F3kcWHXdRggjCE8=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/resty.v1 v1.12.0 h1:CuXP0Pjfw9rOuY6EP+UvtNvt5DSqHpIxILZKT/quCZI=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -837,8 +976,13 @@ honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0 h1:HfqmD5MEmC0zvwBuF187nq9mdnXjXsSivRiXN7SmRkE=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

middleware/tracing/tracing.go

@@ -9,7 +9,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/propagation"
-	oteltrace "go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace"
 	"google.golang.org/grpc/metadata"
 )
 
@@ -17,7 +17,7 @@ import (
 type Option func(*options)
 
 type options struct {
-	TracerProvider oteltrace.TracerProvider
+	TracerProvider trace.TracerProvider
 	Propagators    propagation.TextMapPropagator
 }
 
@@ -27,7 +27,7 @@ func WithPropagators(propagators propagation.TextMapPropagator) Option {
 	}
 }
 
-func WithTracerProvider(provider oteltrace.TracerProvider) Option {
+func WithTracerProvider(provider trace.TracerProvider) Option {
 	return func(opts *options) {
 		opts.TracerProvider = provider
 	}
@@ -47,12 +47,10 @@ func (mc MetadataCarrier) Get(key string) string {
 	return values[0]
 }
 
-// Set stores the key-value pair.
 func (mc MetadataCarrier) Set(key string, value string) {
 	mc.md.Set(key, value)
 }
 
-// Set stores the key-value pair.
 func (mc MetadataCarrier) Keys() []string {
 	keys := make([]string, 0, mc.md.Len())
 	for key := range *mc.md {
@@ -63,14 +61,17 @@ func (mc MetadataCarrier) Keys() []string {
 
 // Server returns a new server middleware for OpenTelemetry.
 func Server(opts ...Option) middleware.Middleware {
-	options := options{
+	options := options{}
-		TracerProvider: otel.GetTracerProvider(),
-		Propagators:    otel.GetTextMapPropagator(),
-	}
 	for _, o := range opts {
 		o(&options)
 	}
-	tracer := options.TracerProvider.Tracer("server")
+	if options.TracerProvider != nil {
+		otel.SetTracerProvider(options.TracerProvider)
+	}
+	if options.Propagators != nil {
+		otel.SetTextMapPropagator(options.Propagators)
+	}
+	tracer := otel.Tracer("server")
 	return func(handler middleware.Handler) middleware.Handler {
 		return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
 			var (
@@ -81,21 +82,19 @@ func Server(opts ...Option) middleware.Middleware {
 				// HTTP span
 				component = "HTTP"
 				operation = info.Request.RequestURI
-				ctx = propagation.NewCompositeTextMapPropagator(options.Propagators).
+				ctx = otel.GetTextMapPropagator().Extract(ctx, propagation.HeaderCarrier(info.Request.Header))
-					Extract(ctx, propagation.HeaderCarrier(info.Request.Header))
 			} else if info, ok := grpc.FromServerContext(ctx); ok {
 				// gRPC span
 				component = "gRPC"
 				operation = info.FullMethod
 				if md, ok := metadata.FromIncomingContext(ctx); ok {
-					ctx = propagation.NewCompositeTextMapPropagator(options.Propagators).
+					ctx = otel.GetTextMapPropagator().Extract(ctx, MetadataCarrier{md: &md})
-						Extract(ctx, MetadataCarrier{md: &md})
 				}
 			}
 			ctx, span := tracer.Start(ctx,
 				operation,
-				oteltrace.WithAttributes(attribute.String("component", component)),
+				trace.WithAttributes(attribute.String("component", component)),
-				oteltrace.WithSpanKind(oteltrace.SpanKindServer),
+				trace.WithSpanKind(trace.SpanKindServer),
 			)
 			defer span.End()
 			if reply, err = handler(ctx, req); err != nil {
@@ -112,14 +111,17 @@ func Server(opts ...Option) middleware.Middleware {
 
 // Client returns a new client middleware for OpenTelemetry.
 func Client(opts ...Option) middleware.Middleware {
-	options := options{
+	options := options{}
-		TracerProvider: otel.GetTracerProvider(),
-		Propagators:    otel.GetTextMapPropagator(),
-	}
 	for _, o := range opts {
 		o(&options)
 	}
-	tracer := options.TracerProvider.Tracer("client")
+	if options.TracerProvider != nil {
+		otel.SetTracerProvider(options.TracerProvider)
+	}
+	if options.Propagators != nil {
+		otel.SetTextMapPropagator(options.Propagators)
+	}
+	tracer := otel.Tracer("client")
 	return func(handler middleware.Handler) middleware.Handler {
 		return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
 			var (
@@ -145,11 +147,11 @@ func Client(opts ...Option) middleware.Middleware {
 			}
 			ctx, span := tracer.Start(ctx,
 				operation,
-				oteltrace.WithAttributes(attribute.String("component", component)),
+				trace.WithAttributes(attribute.String("component", component)),
-				oteltrace.WithSpanKind(oteltrace.SpanKindClient),
+				trace.WithSpanKind(trace.SpanKindClient),
 			)
 			defer span.End()
-			propagation.NewCompositeTextMapPropagator(options.Propagators).Inject(ctx, carrier)
+			otel.GetTextMapPropagator().Inject(ctx, carrier)
 			if reply, err = handler(ctx, req); err != nil {
 				span.RecordError(err)
 				span.SetAttributes(