feat: add force kill signal handler that dumps stacks

backrest.go

@@ -9,8 +9,10 @@ import (
 	"os"
 	"os/signal"
 	"path"
+	"runtime"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"syscall"
 
 	"github.com/garethgeorge/backrest/gen/go/v1/v1connect"
@@ -46,7 +48,8 @@ func main() {
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
-	go onterm(cancel)
+	go onterm(os.Interrupt, cancel)
+	go onterm(os.Interrupt, newForceKillHandler())
 
 	// Load the configuration
 	configStore := createConfigProvider()
@@ -146,11 +149,13 @@ func createConfigProvider() config.ConfigStore {
 	}
 }
 
-func onterm(callback func()) {
+func onterm(s os.Signal, callback func()) {
 	sigchan := make(chan os.Signal, 1)
-	signal.Notify(sigchan, os.Interrupt, syscall.SIGTERM)
+	signal.Notify(sigchan, s, syscall.SIGTERM)
+	for {
 		<-sigchan
 		callback()
+	}
 }
 
 func getSecret() []byte {
@@ -174,3 +179,17 @@ func getSecret() []byte {
 	}
 	return secret
 }
+
+func newForceKillHandler() func() {
+	var times atomic.Int32
+	return func() {
+		if times.Load() > 0 {
+			buf := make([]byte, 1<<16)
+			runtime.Stack(buf, true)
+			os.Stderr.Write(buf)
+			zap.S().Fatal("dumped all running coroutine stack traces, forcing termination")
+		}
+		times.Add(1)
+		zap.S().Warn("attempting graceful shutdown, to force termination press Ctrl+C again")
+	}
+}

internal/orchestrator/repo/repo.go

@@ -37,7 +37,7 @@ func NewRepoOrchestrator(config *v1.Config, repoConfig *v1.Repo, resticPath stri
 
 	var opts []restic.GenericOption
 	opts = append(opts, restic.WithEnviron())
-	opts = append(opts, restic.WithEnv("RESTIC_PROGRESS_FPS=0.5"))
+	opts = append(opts, restic.WithEnv("RESTIC_PROGRESS_FPS=2"))
 
 	if env := repoConfig.GetEnv(); len(env) != 0 {
 		for _, e := range env {

internal/orchestrator/tasks/taskbackup.go

@@ -146,7 +146,7 @@ func (t *BackupTask) Run(ctx context.Context, st ScheduledTask, runner TaskRunne
 			zap.S().Warnf("unexpected message type %q in backup progress entry", entry.MessageType)
 		}
 
-		if time.Since(lastSent) < 1*time.Second {
+		if time.Since(lastSent) <= 1000*time.Millisecond {
 			return
 		}
 		lastSent = time.Now()

internal/orchestrator/tasks/taskindexsnapshots.go

@@ -50,8 +50,6 @@ func indexSnapshotsHelper(ctx context.Context, st ScheduledTask, taskRunner Task
 	t := st.Task
 	oplog := taskRunner.OpLog()
 
-	config := taskRunner.Config()
-
 	repo, err := taskRunner.GetRepoOrchestrator(t.RepoID())
 	if err != nil {
 		return fmt.Errorf("couldn't get repo %q: %w", t.RepoID(), err)