mirror of
https://github.com/psviderski/uncloud.git
synced 2026-10-07 13:49:02 +00:00
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package journal
|
|
|
|
import (
|
|
"bufio"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"os/exec"
|
|
"time"
|
|
|
|
"github.com/psviderski/uncloud/pkg/api"
|
|
)
|
|
|
|
const journalctl = "journalctl"
|
|
|
|
var commandContext = exec.CommandContext // allow override for test
|
|
|
|
func logs(ctx context.Context, unit string, opts api.ServiceLogsOptions) (io.ReadCloser, func() error, error) {
|
|
args := []string{"-u", unit, "--no-hostname"}
|
|
args = append(args, "-n")
|
|
if opts.Tail > -1 {
|
|
args = append(args, fmt.Sprintf("%d", opts.Tail))
|
|
} else {
|
|
args = append(args, "all")
|
|
}
|
|
if opts.Follow {
|
|
args = append(args, "-f")
|
|
}
|
|
|
|
args = append(args, "-o")
|
|
args = append(args, "short-unix")
|
|
|
|
if opts.Since != "" {
|
|
args = append(args, "-S")
|
|
args = append(args, journalTimestamp(opts.Since))
|
|
}
|
|
if opts.Until != "" {
|
|
args = append(args, "-U")
|
|
args = append(args, journalTimestamp(opts.Until))
|
|
}
|
|
|
|
cmd := commandContext(ctx, journalctl, args...)
|
|
p, err := cmd.StdoutPipe()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if err := cmd.Start(); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
return p, cmd.Wait, nil
|
|
}
|
|
|
|
// journalTimestamp formats normalised client timestamps for journalctl versions that do not
|
|
// accept RFC 3339 timezone suffixes. Support for timestamps containing T and Z was added in
|
|
// systemd 255 (6 December 2023). Debian 12 ships systemd 252, so it still needs this conversion.
|
|
// Journald timestamps have microsecond precision.
|
|
func journalTimestamp(value string) string {
|
|
if t, err := time.Parse(time.RFC3339Nano, value); err == nil {
|
|
return t.UTC().Format("2006-01-02 15:04:05.999999") + " UTC"
|
|
}
|
|
// Preserve raw filters from older clients and SDK callers.
|
|
return value
|
|
}
|
|
|
|
// follow synchronously follows the io.Reader, writing each new journal entry to channel.
|
|
// It stops when the reader is exhausted or the context is cancelled.
|
|
func follow(ctx context.Context, reader io.Reader, outCh chan api.LogEntry) {
|
|
scanner := bufio.NewScanner(reader)
|
|
|
|
for scanner.Scan() {
|
|
select {
|
|
case outCh <- entry(scanner.Bytes()):
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
if err := scanner.Err(); err != nil {
|
|
outCh <- api.LogEntry{Err: fmt.Errorf("journal logs: %w", err)}
|
|
}
|
|
}
|