chore: add logparser logic for agent and add parsed log to clickhouse

agent/internal/logsource/journald/impl.go

@@ -0,0 +1,55 @@
+package journald
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os/exec"
+	"syscall"
+
+	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/agent/internal/config"
+	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/agent/internal/logsource"
+)
+
+var _ logsource.LogSource = new(JournaldLogSource)
+
+type JournaldLogSource struct {
+	cmd           *exec.Cmd
+	stdout        io.ReadCloser
+	stdoutscanner *bufio.Scanner
+}
+
+// ReadLine implements logsource.LogSource.
+func (j *JournaldLogSource) ReadLine() (string, error) {
+	if j.stdoutscanner.Scan() {
+		return j.stdoutscanner.Text(), nil
+	} else {
+		if j.stdoutscanner.Err() == nil {
+			return "", fmt.Errorf("%w: %s", logsource.ErrDead, io.EOF)
+		}
+		return "", j.stdoutscanner.Err()
+	}
+}
+func (j *JournaldLogSource) Close() error {
+	_ = j.cmd.Process.Signal(syscall.SIGTERM)
+	return j.cmd.Wait()
+}
+
+func New(cfg config.ServiceConfig, logdir string) (*JournaldLogSource, error) {
+	args := make([]string, 0)
+	if cfg.Path != nil {
+		args = append(args, "-u", *cfg.Path)
+	}
+	args = append(args, "-f", "-n", "0", "-o", "short", "--no-pager", "--directory", logdir)
+	cmd := exec.Command("journalctl", args...) //nolint:gosec
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+	err = cmd.Start()
+	if err != nil {
+		return nil, err
+	}
+	stdoutscanner := bufio.NewScanner(stdout)
+	return &JournaldLogSource{cmd, stdout, stdoutscanner}, nil
+}