/
main.go
111 lines (91 loc) · 2.79 KB
/
main.go
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package main
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"os/signal"
"time"
handle "github.com/danielzinhors/go_telemetry/service_cep/internal/handlers"
"github.com/danielzinhors/go_telemetry/service_cep/internal/services"
usecase "github.com/danielzinhors/go_telemetry/service_cep/internal/usecases"
"github.com/go-chi/chi/middleware"
"github.com/go-chi/chi/v5"
"github.com/joho/godotenv"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
func main() {
godotenv.Load(".env")
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
defer stop()
otelShutdown, err := getOTelShutdown(ctx)
if err != nil {
panic(err)
}
defer func() {
err = errors.Join(err, otelShutdown(context.Background()))
}()
r := chi.NewRouter()
r.Use(middleware.Recoverer)
getTempHandler := handle.NewGetTempHandler(
usecase.NewGetTempUseCase(
services.NewServiceWeatherService(),
),
)
r.Get("/ensolarado", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("Sem chances de chuva"))
})
r.Post("/", getTempHandler.Handle)
portServer := ":" + os.Getenv("PORT_API")
server := &http.Server{Addr: portServer, Handler: r}
srvErr := make(chan error, 1)
go func() {
srvErr <- server.ListenAndServe()
}()
select {
case err = <-srvErr:
panic(err)
case <-ctx.Done():
stop()
}
err = server.Shutdown(context.Background())
}
func getOTelShutdown(ctx context.Context) (shutdown func(context.Context) error, err error) {
res, err := resource.New(ctx, resource.WithAttributes(semconv.ServiceName(os.Getenv("OTEL_SERVICE_NAME"))))
if err != nil {
return nil, fmt.Errorf("failed to create resource: %w", err)
}
ctx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
conn, err := grpc.DialContext(
ctx,
os.Getenv("OTEL_COLLECTOR_URL"),
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithBlock(),
)
if err != nil {
return nil, fmt.Errorf("failed to create gRPC connection to collector: %w", err)
}
tracerExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn))
if err != nil {
return nil, fmt.Errorf("failed to create trace exporter: %w", err)
}
bsp := sdktrace.NewBatchSpanProcessor(tracerExporter)
traceProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
otel.SetTracerProvider(traceProvider)
otel.SetTextMapPropagator(propagation.TraceContext{})
return traceProvider.Shutdown, nil
}