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main.go
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package main
import (
"context"
"errors"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/ONSdigital/dp-download-service/config"
"github.com/ONSdigital/dp-download-service/service"
"github.com/ONSdigital/dp-download-service/service/external"
dpotelgo "github.com/ONSdigital/dp-otel-go"
"github.com/ONSdigital/log.go/v2/log"
)
var (
// BuildTime represents the time in which the service was built
BuildTime string
// GitCommit represents the commit (SHA-1) hash of the service that is running
GitCommit string
// Version represents the version of the service that is running
Version string
)
const serviceName = "dp-download-service"
func main() {
log.Namespace = serviceName
ctx := context.Background()
if err := run(ctx); err != nil {
log.Fatal(ctx, "fatal runtime error", err)
os.Exit(1)
}
}
func run(ctx context.Context) error {
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
cfg, err := config.Get()
if err != nil {
log.Fatal(ctx, "error getting config", err)
os.Exit(1)
}
log.Info(ctx, "config on startup", log.Data{"config": cfg})
if cfg.OtelEnabled {
// Set up Open Telemetry
otelConfig := dpotelgo.Config{
OtelServiceName: cfg.OTServiceName,
OtelExporterOtlpEndpoint: cfg.OTExporterOTLPEndpoint,
OtelBatchTimeout: cfg.OTBatchTimeout,
}
otelShutdown, oErr := dpotelgo.SetupOTelSDK(ctx, otelConfig)
if oErr != nil {
return fmt.Errorf("error setting up OpenTelemetry - hint: ensure OTEL_EXPORTER_OTLP_ENDPOINT is set. %w", oErr)
}
// Handle shutdown properly so nothing leaks.
defer func() {
err = errors.Join(err, otelShutdown(context.Background()))
}()
}
svc, err := service.New(ctx, BuildTime, GitCommit, Version, cfg, &external.External{})
if err != nil {
log.Fatal(ctx, "could not set up Download service", err)
os.Exit(1)
}
svc.Run(ctx)
sig := <-signals // blocks until an os interrupt or a fatal error occurs
log.Info(ctx, "os signal received", log.Data{"signal": sig})
return svc.Close(ctx)
}