f-29: watchdog: add checkvms #29

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/watchdog/check_vm.go

@@ -0,0 +1,99 @@
+package watchdog
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strconv"
+
+	configuration "git.g3e.fr/syonad/two/internal/config/agent"
+	"git.g3e.fr/syonad/two/internal/netns"
+	"git.g3e.fr/syonad/two/internal/qemu"
+	"git.g3e.fr/syonad/two/internal/qmp"
+	"git.g3e.fr/syonad/two/internal/state"
+	"git.g3e.fr/syonad/two/internal/watchdog/notify"
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+
+	"github.com/dgraph-io/badger/v4"
+)
+
+func tapName(tapID int) string {
+	return fmt.Sprintf("tap%d", tapID)
+}
+
+func CheckVMs(db *badger.DB, cfg *configuration.Config, u unitChecker, n notify.Notifier) error {
+	if cfg == nil {
+		return errors.New("watchdog: configuration requise pour vérifier les VMs")
+	}
+
+	pairs, err := kv.ListByPrefix(db, prefixVM)
+	if err != nil {
+		return fmt.Errorf("watchdog: lecture des vm: %w", err)
+	}
+
+	for _, name := range resourceNames(pairs, prefixVM) {
+		st, err := state.Get(db, prefixVM+name)
+		if err != nil {
+			n.Notify(kindVM, name, fmt.Sprintf("état illisible en base: %v", err))
+			continue
+		}
+		if st != state.Running {
+			continue
+		}
+		checkVM(db, cfg, name, u, n)
+	}
+	return nil
+}
+
+func checkVM(db *badger.DB, cfg *configuration.Config, name string, u unitChecker, n notify.Notifier) {
+	subnetName, err := kv.GetFromDB(db, prefixVM+name+"/subnet")
+	if err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("subnet illisible en base: %v", err))
+		return
+	}
+
+	vpc, err := kv.GetFromDB(db, prefixSubnet+subnetName+"/vpc")
+	if err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("vpc du subnet %s illisible en base: %v", subnetName, err))
+		return
+	}
+
+	checkVMTap(db, name, vpc, n)
+	checkVMQemu(cfg, name, n)
+	checkUnit(kindVM, name, "metadata@"+name+".service", u, n)
+	checkUnit(kindVM, name, qemu.ScopeName(name), u, n)
+}
+
+func checkVMTap(db *badger.DB, name, vpc string, n notify.Notifier) {
+	raw, err := kv.GetFromDB(db, prefixVM+name+"/tap_id")
+	if err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("tap_id illisible en base: %v", err))
+		return
+	}
+	tapID, err := strconv.Atoi(raw)
+	if err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("tap_id invalide %q: %v", raw, err))
+		return
+	}
+
+	if !netns.Exist(vpc) {
+		n.Notify(kindVM, name, "netns "+vpc+" absent (/var/run/netns/"+vpc+")")
+		return
+	}
+
+	if err := netns.Call(vpc, func() error {
+		if p := linkProblem(tapName(tapID)); p != "" {
+			n.Notify(kindVM, name, p+" (dans le netns "+vpc+")")
+		}
+		return nil
+	}); err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("entrée dans le netns %s impossible: %v", vpc, err))
+	}
+}
+
+func checkVMQemu(cfg *configuration.Config, name string, n notify.Notifier) {
+	sock := filepath.Join(cfg.QEMU.QMPDir, name+".sock")
+	if _, err := qmp.Send(sock, nil); err != nil {
+		n.Notify(kindVM, name, fmt.Sprintf("qemu ne répond pas sur %s: %v", sock, err))
+	}
+}