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main.go
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package main
import (
"context"
"fmt"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"github.com/cloudhut/kminion/v2/e2e"
"github.com/cloudhut/kminion/v2/kafka"
"github.com/cloudhut/kminion/v2/logging"
"github.com/cloudhut/kminion/v2/minion"
"github.com/cloudhut/kminion/v2/prometheus"
promclient "github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/zap"
)
func main() {
startupLogger, err := zap.NewProduction()
if err != nil {
panic(fmt.Errorf("failed to create startup logger: %w", err))
}
cfg, err := newConfig(startupLogger)
if err != nil {
startupLogger.Fatal("failed to parse config", zap.Error(err))
}
logger := logging.NewLogger(cfg.Logger, cfg.Exporter.Namespace).Named("main")
if err != nil {
startupLogger.Fatal("failed to create new logger", zap.Error(err))
}
logger.Info("started kminion", zap.String("version", cfg.Version))
// Setup context that cancels when the application receives an interrupt signal
ctx, cancel := context.WithCancel(context.Background())
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
defer func() {
signal.Stop(c)
cancel()
}()
go func() {
select {
case <-c:
logger.Info("received a signal, going to shut down KMinion")
cancel()
case <-ctx.Done():
}
}()
wrappedRegisterer := promclient.WrapRegistererWithPrefix(cfg.Exporter.Namespace+"_", promclient.DefaultRegisterer)
// Create kafka service
kafkaSvc := kafka.NewService(cfg.Kafka, logger)
// Create minion service
// Prometheus exporter only talks to the minion service which
// issues all the requests to Kafka and wraps the interface accordingly.
minionSvc, err := minion.NewService(cfg.Minion, logger, kafkaSvc, cfg.Exporter.Namespace, ctx)
if err != nil {
logger.Fatal("failed to setup minion service", zap.Error(err))
}
err = minionSvc.Start(ctx)
if err != nil {
logger.Fatal("failed to start minion service", zap.Error(err))
}
// Create end to end testing service
if cfg.Minion.EndToEnd.Enabled {
e2eService, err := e2e.NewService(
ctx,
cfg.Minion.EndToEnd,
logger,
kafkaSvc,
wrappedRegisterer,
)
if err != nil {
logger.Fatal("failed to create end-to-end monitoring service: %w", zap.Error(err))
}
if err = e2eService.Start(ctx); err != nil {
logger.Fatal("failed to start end-to-end monitoring service", zap.Error(err))
}
}
// The Prometheus exporter that implements the Prometheus collector interface
exporter, err := prometheus.NewExporter(cfg.Exporter, logger, minionSvc)
if err != nil {
logger.Fatal("failed to setup prometheus exporter", zap.Error(err))
}
exporter.InitializeMetrics()
promclient.MustRegister(exporter)
http.Handle("/metrics",
promhttp.InstrumentMetricHandler(
promclient.DefaultRegisterer,
promhttp.HandlerFor(
promclient.DefaultGatherer,
promhttp.HandlerOpts{},
),
),
)
http.Handle("/ready", minionSvc.HandleIsReady())
// Start HTTP server
address := net.JoinHostPort(cfg.Exporter.Host, strconv.Itoa(cfg.Exporter.Port))
logger.Info("listening on address", zap.String("listen_address", address))
if err := http.ListenAndServe(address, nil); err != nil {
logger.Error("error starting HTTP server", zap.Error(err))
os.Exit(1)
}
}