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|
package app
import (
"context"
"fmt"
"log/slog"
"net"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/ChausseBenjamin/rafta/internal/db"
"github.com/ChausseBenjamin/rafta/internal/logging"
"github.com/ChausseBenjamin/rafta/internal/pb"
"github.com/urfave/cli/v3"
"google.golang.org/grpc"
)
func action(ctx context.Context, cmd *cli.Command) error {
err := logging.Setup(
cmd.String(FlagLogLevel),
cmd.String(FlagLogFormat),
cmd.String(FlagLogOutput),
)
if err != nil {
slog.WarnContext(ctx, "Error(s) occurred during logger initialization", logging.ErrKey, err)
}
slog.InfoContext(ctx, "Starting rafta server")
errAppChan := make(chan error)
readyChan := make(chan bool)
shutdownDone := make(chan struct{}) // Signals when graceful shutdown is complete
var once sync.Once
gracefulShutdown := func() {}
brutalShutdown := func() {}
application := func() {
server, store, err := initApp(ctx, cmd)
if err != nil {
errAppChan <- err
return
}
gracefulShutdown = func() {
once.Do(func() { // Ensure brutal shutdown isn't triggered later
server.GracefulStop()
store.Close()
slog.InfoContext(ctx, "Application shutdown")
close(shutdownDone) // Signal that graceful shutdown is complete
})
}
brutalShutdown = func() {
once.Do(func() { // Ensure graceful shutdown isn't re-executed
slog.WarnContext(ctx, "Graceful shutdown delay exceeded, shutting down NOW!")
server.Stop()
store.Close()
})
}
port := fmt.Sprintf(":%d", cmd.Int(FlagListenPort))
listener, err := net.Listen("tcp", port)
if err != nil {
errAppChan <- err
return
}
slog.InfoContext(ctx, "Server listening", "port", cmd.Int(FlagListenPort))
readyChan <- true
if err := server.Serve(listener); err != nil {
errAppChan <- err
}
}
go application()
stopChan := waitForTermChan()
running := true
for running {
select {
case errApp := <-errAppChan:
if errApp != nil {
slog.ErrorContext(ctx, "Application error", logging.ErrKey, errApp)
}
return errApp
case <-stopChan:
slog.InfoContext(ctx, "Shutdown requested")
go gracefulShutdown()
select {
case <-shutdownDone: // If graceful shutdown completes in time, exit normally
case <-time.After(cmd.Duration(FlagGraceTimeout)): // Timeout exceeded
brutalShutdown()
}
running = false
}
}
return nil
}
func waitForTermChan() chan os.Signal {
stopChan := make(chan os.Signal, 1)
signal.Notify(stopChan, syscall.SIGINT, syscall.SIGTERM)
return stopChan
}
func initApp(ctx context.Context, cmd *cli.Command) (*grpc.Server, *db.Store, error) {
store, err := db.Setup(ctx, cmd.String(FlagDBPath))
if err != nil {
slog.ErrorContext(ctx, "Unable to setup database", logging.ErrKey, err)
return nil, nil, err
}
server, err := pb.Setup(ctx, store)
if err != nil {
slog.ErrorContext(ctx, "Unable to setup gRPC server", logging.ErrKey, err)
return nil, nil, err
}
return server, store, nil
}
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