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gatawey.go
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gatawey.go
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package server
import (
"context"
"errors"
"fmt"
"github.com/arslanovdi/logistic-package-api/internal/config"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"log/slog"
"net/http"
"os"
pb "github.com/arslanovdi/logistic-package-api/pkg/logistic-package-api"
)
var (
httpTotalRequests = promauto.NewCounter(prometheus.CounterOpts{
Name: "http_microservice_requests_total",
Help: "The total number of incoming HTTP requests",
})
)
type gatewayServer struct {
server *http.Server
}
// NewGatewayServer returns HTTP gRPC-gateway server
func NewGatewayServer() *gatewayServer {
cfg := config.GetConfigInstance()
grpcAddr := fmt.Sprintf("%s:%v", cfg.Grpc.Host, cfg.Grpc.Port)
gatewayAddr := fmt.Sprintf("%s:%v", cfg.Rest.Host, cfg.Rest.Port)
log := slog.With("func", "server.NewGatewayServer")
conn, err := grpc.DialContext(
context.Background(),
grpcAddr,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithStatsHandler(otelgrpc.NewClientHandler()), // openTelemtry трассировка grpc клиента
)
if err != nil {
log.Warn("Failed to dial gRPC server",
slog.String("error", err.Error()))
}
rmux := runtime.NewServeMux()
if err := pb.RegisterLogisticPackageApiServiceHandler(context.Background(), rmux, conn); err != nil {
log.Warn("Failed registration handler",
slog.String("error", err.Error()))
os.Exit(1)
}
mux := http.NewServeMux()
mux.Handle("/",
httpMetricWrapper( // оборачиваем HTTP методы, подсчитываем метрики
otelhttp.NewHandler(rmux, "grpc-gateway"), // Оборачиваем HTTP методы gRPC в openTelemtry трейсы
),
)
mux.HandleFunc("/swagger-ui/swagger.json", func(w http.ResponseWriter, r *http.Request) { // Подменяем swagger.json, указанный в файле swagger-initializer.js сгенерированным logistic_package_api.swagger.json
http.ServeFile(w, r, "./swagger/logistic_package_api.swagger.json")
})
mux.Handle("/swagger-ui/", http.StripPrefix("/swagger-ui/", http.FileServer(http.Dir("./swagger-ui/"))))
server := &http.Server{
Addr: gatewayAddr,
Handler: mux,
}
return &gatewayServer{
server: server,
}
}
// Start
// starts the gateway server and Swagger server
// cancelFunc - функция отмены контекста, вызывается в случае ошибки запуска
func (s *gatewayServer) Start(cancelFunc context.CancelFunc) {
log := slog.With("func", "GatewayServer.Start")
cfg := config.GetConfigInstance()
gatewayAddr := fmt.Sprintf("%s:%v", cfg.Rest.Host, cfg.Rest.Port)
go func() {
log.Info("Gateway server is running", slog.String("address", gatewayAddr))
log.Info("Swagger server is running", slog.String("address", gatewayAddr+"/swagger-ui/"))
if err := s.server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
log.Error("Failed running gateway server", slog.String("error", err.Error()))
cancelFunc()
}
}()
}
// Stop
// stops the gateway server correctly
func (s *gatewayServer) Stop(ctx context.Context) {
log := slog.With("func", "GatewayServer.Stop")
if err := s.server.Shutdown(ctx); err != nil {
log.Error("gatewayServer.Shutdown", slog.String("error", err.Error()))
} else {
log.Info("gatewayServer shut down correctly")
}
}
// httpMetricWrapper
// обертка для http запросов
// подсчет метрик
func httpMetricWrapper(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
httpTotalRequests.Inc() // метрика
h.ServeHTTP(w, r)
})
}