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137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
package main
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import (
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"context"
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"errors"
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// "flag"
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"fmt"
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"io"
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"log/slog"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"git.runcible.io/learning/pulley/internal/config"
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"git.runcible.io/learning/pulley/internal/logging"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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const Version = "1.0.0"
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//type config struct {
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// port int
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// env string
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// logLevel string
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//}
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type application struct {
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config config.ServiceConfig
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logger *slog.Logger
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}
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func run(ctx context.Context, w io.Writer, args []string) error {
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// var cfg config
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// flagSet := flag.NewFlagSet(args[0], flag.ExitOnError)
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// flagSet.IntVar(&cfg.port, "port", 5002, "API server port")
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// flagSet.StringVar(&cfg.env, "env", "development", "Environment (development|staging|production)")
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// flagSet.StringVar(&cfg.logLevel, "log-level", "INFO", "Logging Level (INFO|DEBUG|WARN|ERROR)")
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// if err := flagSet.Parse(args[1:]); err != nil {
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// return err
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// }
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cfg := config.GetServiceConfig()
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logger := logging.InitLogging(cfg.LogLevel, w, true)
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signalCtx, stop := signal.NotifyContext(ctx, syscall.SIGTERM, syscall.SIGINT)
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defer func() {
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slog.Info("Calling signal watcher stop.")
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stop()
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}()
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// appCtx is a context that can be programatically called to initiate the shutdown process
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// it inherits from signalCtx which will stop on receipt of an OS signal. You can think of
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// appCtx as responding to internal signals in the app, and signalCtx as responding to
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// external signals sent to the app.
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appCtx, cancel := context.WithCancel(signalCtx)
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defer cancel()
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pool, err := pgxpool.New(appCtx, cfg.DatabaseUri)
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if err != nil {
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slog.Error("Error encountered in creating pgx postgres connection pool", "error", err.Error())
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return err
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}
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defer func() {
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slog.Info("Closing database connection pool")
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pool.Close()
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}()
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if err := pool.Ping(appCtx); err != nil {
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slog.Error("Error in attempting first postgres database connection")
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return err
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}
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app := application{config: cfg, logger: logger}
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srv := &http.Server{
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Addr: fmt.Sprintf("%s:%d", "0.0.0.0", app.config.Port),
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ErrorLog: slog.NewLogLogger(app.logger.Handler(), slog.LevelError),
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IdleTimeout: time.Minute,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 10 * time.Second,
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MaxHeaderBytes: 524288, // 0.5 mb
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Handler: app.routes(),
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}
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slog.Info(fmt.Sprintf("Listening on http://%s", srv.Addr))
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defer func() {
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slog.Debug("Must have hit a graceful shutdown")
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}()
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go func() {
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if err := srv.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
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slog.Error(err.Error())
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os.Exit(1)
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slog.Info("Stopped serving connections")
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}
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}()
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// Handle graceful shutdown
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// This was an older way to do it before 1.16. Now we can use signal.NotifyContext
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// sigChan := make(chan os.Signal, 1)
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// signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
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// Block until signal is received
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//<-sigChan
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<-appCtx.Done()
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// We don't want to inherit from appCtx because it has already been canceled at this point
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shutdownCtx, shutdownRelease := context.WithTimeout(context.Background(), 10*time.Second)
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defer shutdownRelease()
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if err := srv.Shutdown(shutdownCtx); err != nil {
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slog.Error("Failed to close within context timeout. Forcing server close.")
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srv.Close()
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return err
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}
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return nil
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}
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func main() {
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ctx := context.Background()
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if err := run(ctx, os.Stdout, os.Args); err != nil {
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slog.Error(err.Error())
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os.Exit(1)
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}
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}
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