fix: machine logs timestamp parsing and streaming for systemd <v255

internal/journal/logs.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"fmt"
 	"slices"
+	"strconv"
 	"time"
 
 	"github.com/psviderski/uncloud/pkg/api"
@@ -33,17 +34,12 @@ func Logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (<-chan
 }
 
 func entry(data []byte) api.LogEntry {
-	// 2025-10-12T11:03:27+02:00 systemd[1]:
+	// 1758193407.686964 systemd[1]: ...
 	timestamp := time.Time{}
 	message := data
-	if len(data) > 30 && data[4] == '-' && data[7] == '-' && data[10] == 'T' {
-		timestampPart, messagePart, found := bytes.Cut(data, []byte(" "))
-		var err error
-		if found {
-			timestamp, err = time.Parse(time.RFC3339Nano, string(timestampPart))
-			if err != nil {
-				timestamp = time.Time{}
-			}
+	if timestampPart, messagePart, found := bytes.Cut(data, []byte(" ")); found {
+		if t, ok := parseUnixTimestamp(timestampPart); ok {
+			timestamp = t
 			message = messagePart
 		}
 	}
@@ -54,3 +50,20 @@ func entry(data []byte) api.LogEntry {
 		Stream:    api.LogStreamStdout,
 	}
 }
+
+// parseUnixTimestamp parses a journalctl short-unix timestamp "SSSSSSSSSS.UUUUUU" with microsecond precision.
+func parseUnixTimestamp(b []byte) (time.Time, bool) {
+	secPart, usecPart, found := bytes.Cut(b, []byte("."))
+	if !found {
+		return time.Time{}, false
+	}
+	sec, err := strconv.ParseInt(string(secPart), 10, 64)
+	if err != nil {
+		return time.Time{}, false
+	}
+	usec, err := strconv.ParseInt(string(usecPart), 10, 64)
+	if err != nil {
+		return time.Time{}, false
+	}
+	return time.Unix(sec, usec*1000), true
+}