Merge branch 'master' into fix/server-sent-event-close-notify

otel/README.md

@@ -0,0 +1,28 @@
+# Use OTEL in Gin
+
+Currently set `ContextWithFallback = true` to use otel in Gin, but this doesn't seem like a good solution.
+
+This example shows a minimum case to use otel in Gin.
+
+To run the example:
+
+```bash
+go run main.go
+```
+
+In stander output like this:
+
+```bash
+[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.
+
+[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
+ - using env:   export GIN_MODE=release
+ - using code:  gin.SetMode(gin.ReleaseMode)
+
+[GIN-debug] GET    /                         --> main.main.func1 (4 handlers)
+[GIN-debug] [WARNING] You trusted all proxies, this is NOT safe. We recommend you to set a value.
+Please check https://pkg.go.dev/github.com/gin-gonic/gin#readme-don-t-trust-all-proxies for details.
+[GIN-debug] Listening and serving HTTP on :8080
+traceID: 00477d7b56b757d0581328ef21d17271; spanID: 9d05e83c0c188a16; isSampled: true
+[GIN] 2024/10/15 - 11:44:32 | 200 |      31.209µs |             ::1 | GET      "/"
+```

otel/go.mod

@@ -0,0 +1,44 @@
+module example
+
+go 1.22.5
+
+require (
+	github.com/gin-gonic/gin v1.10.0
+	go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.56.0
+	go.opentelemetry.io/otel v1.31.0
+	go.opentelemetry.io/otel/sdk v1.31.0
+	go.opentelemetry.io/otel/trace v1.31.0
+)
+
+require (
+	github.com/bytedance/sonic v1.12.3 // indirect
+	github.com/bytedance/sonic/loader v0.2.0 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.5 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	go.opentelemetry.io/otel/metric v1.31.0 // indirect
+	golang.org/x/arch v0.11.0 // indirect
+	golang.org/x/crypto v0.28.0 // indirect
+	golang.org/x/net v0.30.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/text v0.19.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

otel/go.sum

@@ -0,0 +1,103 @@
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+github.com/bytedance/sonic v1.12.3/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
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+github.com/bytedance/sonic/loader v0.2.0 h1:zNprn+lsIP06C/IqCHs3gPQIvnvpKbbxyXQP1iU4kWM=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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otel/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
+	"go.opentelemetry.io/otel"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var applicationName string = "demo"
+
+func main() {
+	otel.SetTracerProvider(sdktrace.NewTracerProvider(sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.AlwaysSample()))))
+	app := gin.Default()
+	app.ContextWithFallback = true
+	app.Use(otelgin.Middleware(applicationName))
+
+	app.GET("/", func(ctx *gin.Context) {
+		traceID, spanID, isSampled := GetTraceInfo(ctx)
+		fmt.Printf("traceID: %v; spanID: %v; isSampled: %v\n", traceID, spanID, isSampled)
+	})
+
+	go func() {
+		if err := app.Run(":8080"); err != nil {
+			log.Fatalln(err)
+		}
+	}()
+
+	http.Get("http://localhost:8080/")
+}
+
+func GetTraceInfo(ctx context.Context) (traceID string, spanID string, isSampled bool) {
+	spanCtx := trace.SpanContextFromContext(ctx)
+
+	if spanCtx.HasTraceID() {
+		traceID = spanCtx.TraceID().String()
+	}
+	if spanCtx.HasSpanID() {
+		spanID = spanCtx.SpanID().String()
+	}
+
+	isSampled = spanCtx.IsSampled()
+
+	return traceID, spanID, isSampled
+}

realtime-advanced/routes.go

@@ -21,8 +21,9 @@ func rateLimit(c *gin.Context) {
 		if value%200 == 0 {
 			fmt.Println("ip blocked")
 		}
-		c.Abort()
 		c.String(http.StatusServiceUnavailable, "you were automatically banned :)")
+		c.Abort()
+		return
 	}
 }
 

realtime-chat/template.go

@@ -8,7 +8,7 @@ var html = template.Must(template.New("chat_room").Parse(`
     <title>{{.roomid}}</title>
     <link rel="stylesheet" type="text/css" href="http://meyerweb.com/eric/tools/css/reset/reset.css">
     <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.js"></script> 
-    <script src="http://malsup.github.com/jquery.form.js"></script> 
+    <script src="http://malsup.github.io/jquery.form.js"></script> 
     <script> 
         $('#message_form').focus();
         $(document).ready(function() { 

server-sent-event/main.go

@@ -127,6 +127,10 @@ func (stream *Event) serveHTTP() gin.HandlerFunc {
 
 		go func() {
 			<-c.Writer.CloseNotify()
+
+			// Drain client channel so that it does not block. Server may keep sending messages to this channel
+			for range clientChan {
+			}
 			// Send closed connection to event server
 			stream.ClosedClients <- clientChan
 		}()