f-29: watchdog: add checkvms #29
Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>
This commit is contained in:
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0fa84b8320
commit
cb812c97ab
GPG key ID:
4406BBBF8845D632
3 changed files with 355 additions and 6 deletions
99
internal/watchdog/check_vm.go
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99
internal/watchdog/check_vm.go
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package watchdog
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import (
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"errors"
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"fmt"
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"path/filepath"
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"strconv"
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configuration "git.g3e.fr/syonad/two/internal/config/agent"
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"git.g3e.fr/syonad/two/internal/netns"
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"git.g3e.fr/syonad/two/internal/qemu"
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"git.g3e.fr/syonad/two/internal/qmp"
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"git.g3e.fr/syonad/two/internal/state"
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"git.g3e.fr/syonad/two/internal/watchdog/notify"
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"git.g3e.fr/syonad/two/pkg/db/kv"
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"github.com/dgraph-io/badger/v4"
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)
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func tapName(tapID int) string {
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return fmt.Sprintf("tap%d", tapID)
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}
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func CheckVMs(db *badger.DB, cfg *configuration.Config, u unitChecker, n notify.Notifier) error {
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if cfg == nil {
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return errors.New("watchdog: configuration requise pour vérifier les VMs")
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}
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pairs, err := kv.ListByPrefix(db, prefixVM)
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if err != nil {
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return fmt.Errorf("watchdog: lecture des vm: %w", err)
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}
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for _, name := range resourceNames(pairs, prefixVM) {
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st, err := state.Get(db, prefixVM+name)
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if err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("état illisible en base: %v", err))
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continue
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}
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if st != state.Running {
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continue
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}
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checkVM(db, cfg, name, u, n)
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}
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return nil
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}
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func checkVM(db *badger.DB, cfg *configuration.Config, name string, u unitChecker, n notify.Notifier) {
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subnetName, err := kv.GetFromDB(db, prefixVM+name+"/subnet")
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if err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("subnet illisible en base: %v", err))
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return
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}
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vpc, err := kv.GetFromDB(db, prefixSubnet+subnetName+"/vpc")
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if err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("vpc du subnet %s illisible en base: %v", subnetName, err))
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return
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}
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checkVMTap(db, name, vpc, n)
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checkVMQemu(cfg, name, n)
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checkUnit(kindVM, name, "metadata@"+name+".service", u, n)
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checkUnit(kindVM, name, qemu.ScopeName(name), u, n)
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}
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func checkVMTap(db *badger.DB, name, vpc string, n notify.Notifier) {
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raw, err := kv.GetFromDB(db, prefixVM+name+"/tap_id")
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if err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("tap_id illisible en base: %v", err))
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return
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}
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tapID, err := strconv.Atoi(raw)
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if err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("tap_id invalide %q: %v", raw, err))
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return
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}
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if !netns.Exist(vpc) {
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n.Notify(kindVM, name, "netns "+vpc+" absent (/var/run/netns/"+vpc+")")
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return
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}
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if err := netns.Call(vpc, func() error {
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if p := linkProblem(tapName(tapID)); p != "" {
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n.Notify(kindVM, name, p+" (dans le netns "+vpc+")")
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}
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return nil
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}); err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("entrée dans le netns %s impossible: %v", vpc, err))
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}
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}
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func checkVMQemu(cfg *configuration.Config, name string, n notify.Notifier) {
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sock := filepath.Join(cfg.QEMU.QMPDir, name+".sock")
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if _, err := qmp.Send(sock, nil); err != nil {
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n.Notify(kindVM, name, fmt.Sprintf("qemu ne répond pas sur %s: %v", sock, err))
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}
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}
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246
internal/watchdog/check_vm_test.go
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246
internal/watchdog/check_vm_test.go
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package watchdog
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import (
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"strings"
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"testing"
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configuration "git.g3e.fr/syonad/two/internal/config/agent"
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"git.g3e.fr/syonad/two/internal/state"
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"github.com/dgraph-io/badger/v4"
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)
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func testCfg(t *testing.T) *configuration.Config {
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t.Helper()
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cfg := &configuration.Config{}
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cfg.QEMU.QMPDir = t.TempDir()
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return cfg
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}
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func seedVM(t *testing.T, db *badger.DB, name, subnetName, vpc, tapID string) {
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t.Helper()
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seedResource(t, db, prefixVM, name, state.Running)
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seedKV(t, db, prefixVM+name+"/subnet", subnetName)
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seedKV(t, db, prefixSubnet+subnetName+"/vpc", vpc)
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if tapID != "" {
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seedKV(t, db, prefixVM+name+"/tap_id", tapID)
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}
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}
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func TestTapName(t *testing.T) {
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if got := tapName(12345678); got != "tap12345678" {
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t.Errorf("tapName = %q, attendu tap12345678", got)
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}
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}
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func TestCheckVMs_ConfigNil(t *testing.T) {
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db := newTestDB(t)
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r := &recorder{}
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err := CheckVMs(db, nil, newFakeUnits(), r)
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if err == nil {
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t.Fatal("une config nil doit produire une erreur, pas une panique")
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}
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if len(r.calls) != 0 {
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t.Errorf("aucune notification attendue, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_BaseVide(t *testing.T) {
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db := newTestDB(t)
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if len(r.calls) != 0 {
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t.Errorf("aucune notification attendue, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_IgnoreLesEtatsNonRunning(t *testing.T) {
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db := newTestDB(t)
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for _, s := range []state.State{state.Creating, state.Deleting, state.Error, state.Deleted} {
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seedResource(t, db, prefixVM, "i-"+string(s), s)
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}
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if len(r.calls) != 0 {
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t.Errorf("aucune notification attendue, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_SubnetManquantEnBase(t *testing.T) {
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db := newTestDB(t)
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seedResource(t, db, prefixVM, "i-test1", state.Running)
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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got := r.forName("i-test1")
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if len(got) != 1 {
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t.Fatalf("attendu 1 notification, obtenu %d : %v", len(got), got)
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}
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if !strings.Contains(got[0].problem, "subnet illisible") {
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t.Errorf("problem = %q, devrait porter sur le subnet", got[0].problem)
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}
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}
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func TestCheckVMs_VPCDuSubnetManquant(t *testing.T) {
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db := newTestDB(t)
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seedResource(t, db, prefixVM, "i-test1", state.Running)
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seedKV(t, db, prefixVM+"i-test1/subnet", "br-000042")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("vpc du subnet br-000042 illisible") {
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t.Errorf("devrait signaler le vpc introuvable, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_TapIDManquant(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("tap_id illisible") {
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t.Errorf("devrait signaler un tap_id illisible, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_TapIDInvalide(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "pas-un-nombre")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("tap_id invalide") {
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t.Errorf("devrait signaler un tap_id invalide, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_QemuNeRepondPas(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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cfg := testCfg(t)
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r := &recorder{}
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if err := CheckVMs(db, cfg, newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("qemu ne répond pas") {
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t.Errorf("devrait signaler que qemu ne répond pas, obtenu %v", r.calls)
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}
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if !r.hasProblemContaining("i-test1.sock") {
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t.Errorf("devrait nommer la socket attendue, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_UnitsInterrogees(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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u := newFakeUnits().active("metadata@i-test1.service").active("two-vm-i-test1.scope")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), u, r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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want := map[string]bool{"metadata@i-test1.service": false, "two-vm-i-test1.scope": false}
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for _, asked := range u.asked {
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if _, ok := want[asked]; !ok {
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t.Errorf("unit inattendue interrogée: %q", asked)
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continue
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}
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want[asked] = true
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}
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for unit, seen := range want {
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if !seen {
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t.Errorf("unit %q non interrogée (interrogées: %v)", unit, u.asked)
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}
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}
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if r.hasProblemContaining("unit ") {
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t.Errorf("des units actives ne doivent rien signaler, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_MetadataInactive(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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u := newFakeUnits().inactive("metadata@i-test1.service", "dead").active("two-vm-i-test1.scope")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), u, r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("unit metadata@i-test1.service inactive (dead)") {
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t.Errorf("devrait signaler metadata inactive, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_ScopeAbsent(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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u := newFakeUnits().active("metadata@i-test1.service")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), u, r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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if !r.hasProblemContaining("unit two-vm-i-test1.scope inactive") {
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t.Errorf("devrait signaler le scope absent, obtenu %v", r.calls)
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}
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}
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func TestCheckVMs_EtatCorrompuNInterrompPasLaBoucle(t *testing.T) {
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db := newTestDB(t)
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seedKV(t, db, prefixVM+"i-corrompu"+stateSuffix, "n_importe_quoi")
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("un état corrompu ne doit pas faire échouer CheckVMs: %v", err)
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}
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if !strings.Contains(strings.Join(problems(r.forName("i-corrompu")), " "), "état illisible") {
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t.Errorf("devrait signaler l'état corrompu, obtenu %v", r.calls)
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}
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if len(r.forName("i-test1")) == 0 {
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t.Error("une clé corrompue ne doit pas empêcher l'examen des VMs suivantes")
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}
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}
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func TestCheckVMs_ClesDeDisqueNeCreentPasDeFausseVM(t *testing.T) {
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db := newTestDB(t)
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seedVM(t, db, "i-test1", "br-000042", "vp-admin", "12345678")
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seedKV(t, db, prefixVM+"i-test1/disk/vda/state", "attached")
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r := &recorder{}
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if err := CheckVMs(db, testCfg(t), newFakeUnits(), r); err != nil {
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t.Fatalf("erreur inattendue: %v", err)
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}
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for _, c := range r.calls {
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if c.name != "i-test1" {
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t.Errorf("ressource inattendue signalée: %q", c.name)
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}
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}
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}
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