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handler.go
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handler.go
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package metric
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"github.com/gorilla/mux"
"github.com/prometheus/client_golang/prometheus/promhttp"
"golang.org/x/exp/slog"
)
func ExtendRouter(router *mux.Router, config *MetricConfig) error {
if config.Prometheus.Enable {
endpoint := config.Prometheus.Endpoint
httpMetric, err := NewHttpMetric()
if err != nil {
return fmt.Errorf("creating http metric setup: %w", err)
}
router.Use(GetPrometheusMiddleware(httpMetric))
if _, err = NewLobbyMetrics(); err != nil {
return fmt.Errorf("creating lobby metric setup: %w", err)
}
if _, err = NewLobbySessionMetrics(); err != nil {
return fmt.Errorf("creating session metric setup: %w", err)
}
if _, err = NewLobbySessionTrackMetrics(); err != nil {
return fmt.Errorf("creating track metric setup: %w", err)
}
if _, err = NewServiceGraphMetrics(); err != nil {
return fmt.Errorf("creating service graph metric setup: %w", err)
}
router.Path(endpoint).Handler(promhttp.Handler())
}
return nil
}
func ServeMetrics(ctx context.Context, config *MetricConfig) error {
router := mux.NewRouter()
addr := fmt.Sprintf(":%d", config.Prometheus.Port)
server := &http.Server{Addr: addr, Handler: router}
if err := ExtendRouter(router, config); err != nil {
slog.Error("creating metrics", "err", err)
}
stopped := make(chan struct{})
go func() {
defer close(stopped)
if err := server.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
slog.Error("metric server error", "err", err)
}
}()
go func() {
select {
case <-ctx.Done():
slog.Info("shutdown metric server")
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
if err := server.Shutdown(ctx); err != nil {
slog.Error("shutting down metric server error", "err", err)
}
cancel()
case <-stopped:
slog.Info("metric server was stopped")
}
}()
return nil
}