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feat: graceful shutdown #19

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Merged
kv1sidisi merged 1 commit into from
Jul 16, 2025
Merged

feat: graceful shutdown #19

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51 changes: 38 additions & 13 deletions cmd/exporter/main.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package main

import (
"context"
"flag"
"fmt"
"github.com/prometheus/client_golang/prometheus"
Expand All @@ -10,10 +11,13 @@ import (
"log/slog"
"net/http"
"os"
"os/signal"
"pg-bash-exporter/internal/cache"
"pg-bash-exporter/internal/collector"
"pg-bash-exporter/internal/config"
"pg-bash-exporter/internal/executor"
"syscall"
"time"
)

var ValidationFlag bool
Expand Down Expand Up @@ -59,21 +63,42 @@ func main() {

registry := prometheus.NewRegistry()
registry.MustRegister(collector)
metricsHandler := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})

http.Handle("/metrics", metricsHandler)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html><head><title>PG Bash Exporter</title></head><body>PG Bash Exporter<p><a href="/metrics">Metrics</a></p></body></html>`))
})

slog.Info("Starting pg-bash-exporter server",
"listen_address", cfg.Server.ListenAddress,
"metrics_path", cfg.Server.MetricsPath,
)
if err := http.ListenAndServe(cfg.Server.ListenAddress, nil); err != nil {
slog.Error("Failed to start server", "error", err)

mux := http.NewServeMux()
mux.Handle(cfg.Server.MetricsPath, promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))

server := &http.Server{
Addr: cfg.Server.ListenAddress,
Handler: mux,
}

go func() {
slog.Info("Starting pg-bash-exporter server",
"listen_address", cfg.Server.ListenAddress,
"metrics_path", cfg.Server.MetricsPath,
)

if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
slog.Error("failed to start server", "error", err)
os.Exit(1)
}
}()

quit := make(chan os.Signal, 1)
signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)

<-quit
slog.Info("shutting down server")

ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()

if err := server.Shutdown(ctx); err != nil {
slog.Error("server forced to shutdown:", "error", err)
os.Exit(1)
}

slog.Info("server exiting")
}

func setupLogger(cfg config.Logging) {
Expand Down