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Go
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import ( "encoding/json" "fmt" "io" "os" "path/filepath" "strings")
type WorkflowLogger struct { file *os.File encoder *json.Encoder}
func NewWorkflowLogger(baseDir string, wid WorkflowId) (*WorkflowLogger, error) { path := LogFilePath(baseDir, wid)
file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644) if err != nil { return nil, fmt.Errorf("creating log file: %w", err) }
return &WorkflowLogger{ file: file, encoder: json.NewEncoder(file), }, nil}
func LogFilePath(baseDir string, workflowID WorkflowId) string { logFilePath := filepath.Join(baseDir, fmt.Sprintf("%s.log", workflowID.String())) return logFilePath}
func (l *WorkflowLogger) Close() error { return l.file.Close()}
func (l *WorkflowLogger) DataWriter(stream string) io.Writer { // TODO: emit stream return &dataWriter{ logger: l, stream: stream, }}
func (l *WorkflowLogger) ControlWriter(idx int, step Step) io.Writer { return &controlWriter{ logger: l, idx: idx, step: step, }}
type dataWriter struct { logger *WorkflowLogger stream string}
func (w *dataWriter) Write(p []byte) (int, error) { line := strings.TrimRight(string(p), "\r\n") entry := NewDataLogLine(line, w.stream) if err := w.logger.encoder.Encode(entry); err != nil { return 0, err } return len(p), nil}
type controlWriter struct { logger *WorkflowLogger idx int step Step}
func (w *controlWriter) Write(_ []byte) (int, error) { entry := NewControlLogLine(w.idx, w.step) if err := w.logger.encoder.Encode(entry); err != nil { return 0, err } return len(w.step.Name()), nil}