logmower-shipper/pkg/mongo_struct/populate.go

package mongo_struct

// TODO: this is misc collection of stuff not really fitting in here

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"strings"
)

func ParseLogName(name string) (m KubeInfo, ok bool) {
	name = filepath.Base(name)

	// https://github.com/kubernetes/design-proposals-archive/blob/8da1442ea29adccea40693357d04727127e045ed/node/kubelet-cri-logging.md
	// <pod_name>_<pod_namespace>_<container_name>-<container_id>.log`

	m.Pod, name, ok = strings.Cut(name, "_")
	if !ok {
		return
	}

	m.Namespace, name, ok = strings.Cut(name, "_")
	if !ok {
		return
	}

	m.ContainerName, name, ok = strings.Cut(name, "-")
	if !ok {
		return
	}

	m.ContainerId = strings.TrimSuffix(name, ".log")
	if !strings.HasSuffix(name, ".log") {
		return
	}

	return m, true
}

func (h *HostInfo) Populate(nodeName string) (err error) {
	if nodeName == "" {
		nodeName, err = os.Hostname()
		if err != nil {
			return fmt.Errorf("getting hostname: %w", err)
		}
	}

	h.Name = strings.TrimSpace(nodeName)

	id, err := os.ReadFile("/etc/machine-id")
	if err != nil {
		return fmt.Errorf("getting machineId: %w", err)
	}

	h.Id = strings.TrimSpace(string(id))

	h.Arch = runtime.GOARCH

	return nil
}