func()

in exporter/collector/metrics.go [281:317]

• 29 lines of code
• 7 McCabe index (conditional complexity)

func (me *MetricsExporter) setupWAL() (uint64, uint64, error) {
	err := me.closeWAL()
	if err != nil {
		return 0, 0, err
	}

	if me.wal == nil {
		me.wal = &exporterWAL{}
	}

	walPath := filepath.Join(me.cfg.MetricConfig.WALConfig.Directory, "gcp_metrics_wal")
	me.wal.path = walPath
	metricWal, err := wal.Open(walPath, &wal.Options{LogFormat: 1})
	if err != nil {
		return 0, 0, err
	}
	me.wal.Log = metricWal

	// default to 1 hour exponential backoff
	me.wal.maxBackoff = defaultWalMaxBackoff
	if me.cfg.MetricConfig.WALConfig.MaxBackoff != 0 {
		me.wal.maxBackoff = me.cfg.MetricConfig.WALConfig.MaxBackoff
	}

	// sync existing WAL indices
	rIndex, err := me.wal.FirstIndex()
	if err != nil {
		return 0, 0, err
	}

	wIndex, err := me.wal.LastIndex()
	if err != nil {
		return 0, 0, err
	}

	return rIndex, wIndex, nil
}