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hello_server.go
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hello_server.go
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package main
import (
"context"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"math/rand"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
)
var tracer = otel.Tracer("github.com/mailaenderli/goHelloWorldServer")
func httpHandler(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
span := trace.SpanFromContext(ctx)
query := r.URL.Query()
name := query.Get("name")
log.Printf("Received request for %s\n", name)
greeting := CreateGreeting(name)
span.SetAttributes(attribute.String("httpHandler.greeting", string(greeting)))
RndDelay(ctx)
w.Write([]byte(greeting))
}
func RndDelay(ctx context.Context) {
_, span := tracer.Start(ctx, "RndDelay")
defer span.End()
rand.Seed(time.Now().UnixNano())
sleepTime := rand.Intn(2000) // n will be between 0 and 2000
time.Sleep(time.Duration(sleepTime)*time.Millisecond)
span.SetAttributes(attribute.Int("httpHandler.rndDelay", int(sleepTime)))
}
func CreateGreeting(name string) string {
if name == "" {
name = "Guest"
}
return "Hello, " + name + "\n"
}
func newResource() *resource.Resource {
return resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(os.Getenv("SIGNALFX_SERVICE_NAME")),
semconv.ServiceVersionKey.String(os.Getenv("SERVICE_VERSION")),
semconv.DeploymentEnvironmentKey.String(os.Getenv("SIGNALFX_SPAN_TAGS")),
)
}
func installExportPipeline(ctx context.Context) func() {
client := otlptracehttp.NewClient()
exporter, err := otlptrace.New(ctx, client)
if err != nil {
log.Fatalf("creating OTLP trace exporter: %v", err)
}
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(newResource()),
)
otel.SetTracerProvider(tracerProvider)
return func() {
if err := tracerProvider.Shutdown(ctx); err != nil {
log.Fatalf("stopping tracer provider: %v", err)
}
}
}
func main() {
ctx := context.Background()
// Registers a tracer Provider globally.
cleanup := installExportPipeline(ctx)
defer cleanup()
// Create Server and Route Handlers
handler := http.HandlerFunc(httpHandler)
wrappedHandler := otelhttp.NewHandler(handler, "httpHandler-instrumented")
mux := http.NewServeMux()
mux.Handle("/", wrappedHandler)
srv := &http.Server{
Handler: mux,
Addr: ":8080",
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
}
// Start Server
go func() {
log.Println("Starting Server")
if err := srv.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
// Graceful Shutdown
waitForShutdown(srv)
}
func waitForShutdown(srv *http.Server) {
interruptChan := make(chan os.Signal, 1)
signal.Notify(interruptChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
// Block until we receive our signal.
<-interruptChan
// Create a deadline to wait for.
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
srv.Shutdown(ctx)
log.Println("Shutting down")
os.Exit(0)
}