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libovsdb.go
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libovsdb.go
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package libovsdb
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"log"
"os"
"path/filepath"
"reflect"
"strings"
"time"
"k8s.io/apimachinery/pkg/util/wait"
"github.com/cenkalti/backoff/v4"
"github.com/go-logr/logr"
"github.com/go-logr/stdr"
"github.com/ovn-org/libovsdb/client"
"github.com/ovn-org/libovsdb/model"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/config"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/nbdb"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/sbdb"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/types"
"github.com/prometheus/client_golang/prometheus"
"gopkg.in/fsnotify/fsnotify.v1"
"gopkg.in/natefinch/lumberjack.v2"
"k8s.io/klog/v2"
"k8s.io/klog/v2/textlogger"
)
func newClientLogger(dbModelName string) (logger logr.Logger, err error) {
logggerFilename := config.Logging.LibovsdbFile
if len(logggerFilename) == 0 {
// Not using a separate log file for libovsdb client
config := textlogger.NewConfig()
logger = textlogger.NewLogger(config)
return logger, nil
}
// Make sure logger file can be opened and created with the right perms
// Ref: https://github.com/natefinch/lumberjack/issues/82#issuecomment-482143273
err = os.MkdirAll(filepath.Dir(logggerFilename), 0755)
if err != nil {
return logger, fmt.Errorf("making directories for logger file %s for libovsdb failed: %w", logggerFilename, err)
}
checkFile, err := os.OpenFile(logggerFilename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640)
if err != nil {
return logger, fmt.Errorf("opening logger file %s for libovsdb failed: %w", logggerFilename, err)
}
_ = checkFile.Close()
// Create the lumberjack logger, which will write to a rolling log file.
ll := &lumberjack.Logger{
Filename: logggerFilename,
MaxSize: config.Logging.LogFileMaxSize, // MB
MaxBackups: config.Logging.LogFileMaxBackups,
MaxAge: config.Logging.LogFileMaxAge, // Days
Compress: true,
}
klog.Infof("Client for %s using log verbosity %d with lumberjack %#v", dbModelName, config.Logging.Level, ll)
clientLog := log.New(ll, "", log.Ldate|log.Ltime|log.Lshortfile)
_ = stdr.SetVerbosity(config.Logging.Level)
logger = stdr.New(clientLog)
return logger, nil
}
// newClient creates a new client object given the provided config
// the stopCh is required to ensure the goroutine for ssl cert
// update is not leaked
func newClient(cfg config.OvnAuthConfig, dbModel model.ClientDBModel, stopCh <-chan struct{}, opts ...client.Option) (client.Client, error) {
const connectTimeout time.Duration = types.OVSDBTimeout * 2
const inactivityTimeout time.Duration = types.OVSDBTimeout * 18
logger, err := newClientLogger(dbModel.Name())
if err != nil {
return nil, err
}
options := []client.Option{
// Reading and parsing the DB after reconnect at scale can (unsurprisingly)
// take longer than a normal ovsdb operation. Give it a bit more time so
// we don't time out and enter a reconnect loop. In addition it also enables
// inactivity check on the ovsdb connection.
client.WithInactivityCheck(inactivityTimeout, connectTimeout, &backoff.ZeroBackOff{}),
client.WithLeaderOnly(true),
client.WithLogger(&logger),
}
options = append(options, opts...)
for _, endpoint := range strings.Split(cfg.GetURL(), ",") {
options = append(options, client.WithEndpoint(endpoint))
}
var updateFn func(client.Client, <-chan struct{})
if cfg.Scheme == config.OvnDBSchemeSSL {
tlsConfig, err := createTLSConfig(cfg.Cert, cfg.PrivKey, cfg.CACert, cfg.CertCommonName)
if err != nil {
return nil, err
}
updateFn, err = newSSLKeyPairWatcherFunc(cfg.Cert, cfg.PrivKey, tlsConfig)
if err != nil {
return nil, err
}
options = append(options, client.WithTLSConfig(tlsConfig))
}
client, err := client.NewOVSDBClient(dbModel, options...)
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), connectTimeout)
defer cancel()
err = client.Connect(ctx)
if err != nil {
return nil, err
}
if updateFn != nil {
go updateFn(client, stopCh)
}
return client, nil
}
// NewSBClient creates a new OVN Southbound Database client
func NewSBClient(stopCh <-chan struct{}) (client.Client, error) {
return NewSBClientWithConfig(config.OvnSouth, prometheus.DefaultRegisterer, stopCh)
}
// NewSBClientWithConfig creates a new OVN Southbound Database client with the provided configuration
func NewSBClientWithConfig(cfg config.OvnAuthConfig, promRegistry prometheus.Registerer, stopCh <-chan struct{}) (client.Client, error) {
dbModel, err := sbdb.FullDatabaseModel()
if err != nil {
return nil, err
}
enableMetricsOption := client.WithMetricsRegistryNamespaceSubsystem(promRegistry,
"ovnkube", "master_libovsdb")
dbModel.SetIndexes(map[string][]model.ClientIndex{
sbdb.EncapTable: {{Columns: []model.ColumnKey{{Column: "chassis_name"}}}},
})
c, err := newClient(cfg, dbModel, stopCh, enableMetricsOption)
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), types.OVSDBTimeout*2)
go func() {
<-stopCh
cancel()
}()
// Only Monitor Required SBDB tables to reduce memory overhead
chassisPrivate := sbdb.ChassisPrivate{}
igmpGroup := sbdb.IGMPGroup{}
_, err = c.Monitor(ctx,
c.NewMonitor(
// used by unidling controller
client.WithTable(&sbdb.ControllerEvent{}),
// used by node sync
client.WithTable(&sbdb.Chassis{}),
// used by zone interconnect
client.WithTable(&sbdb.Encap{}),
// used by node sync, only interested in names
client.WithTable(&chassisPrivate, &chassisPrivate.Name),
// used by node sync, only interested in Chassis reference
client.WithTable(&igmpGroup, &igmpGroup.Chassis),
// used for metrics
client.WithTable(&sbdb.SBGlobal{}),
// used for metrics
client.WithTable(&sbdb.PortBinding{}),
),
)
if err != nil {
c.Close()
return nil, err
}
return c, nil
}
// NewNBClient creates a new OVN Northbound Database client
func NewNBClient(stopCh <-chan struct{}) (client.Client, error) {
return NewNBClientWithConfig(config.OvnNorth, prometheus.DefaultRegisterer, stopCh)
}
// NewNBClientWithConfig creates a new OVN Northbound Database client with the provided configuration
func NewNBClientWithConfig(cfg config.OvnAuthConfig, promRegistry prometheus.Registerer, stopCh <-chan struct{}) (client.Client, error) {
dbModel, err := nbdb.FullDatabaseModel()
if err != nil {
return nil, err
}
enableMetricsOption := client.WithMetricsRegistryNamespaceSubsystem(promRegistry, "ovnkube",
"master_libovsdb")
// define client indexes for objects that are using dbIDs
dbModel.SetIndexes(map[string][]model.ClientIndex{
nbdb.ACLTable: {{Columns: []model.ColumnKey{{Column: "external_ids", Key: types.PrimaryIDKey}}}},
nbdb.DHCPOptionsTable: {{Columns: []model.ColumnKey{{Column: "external_ids", Key: types.PrimaryIDKey}}}},
nbdb.LoadBalancerTable: {{Columns: []model.ColumnKey{{Column: "name"}}}},
nbdb.LogicalSwitchTable: {{Columns: []model.ColumnKey{{Column: "name"}}}},
nbdb.LogicalRouterTable: {{Columns: []model.ColumnKey{{Column: "name"}}}},
})
c, err := newClient(cfg, dbModel, stopCh, enableMetricsOption)
if err != nil {
return nil, err
}
ctx, cancel := context.WithTimeout(context.Background(), types.OVSDBTimeout*2)
go func() {
<-stopCh
cancel()
}()
_, err = c.MonitorAll(ctx)
if err != nil {
c.Close()
return nil, err
}
return c, nil
}
func createTLSConfig(certFile, privKeyFile, caCertFile, serverName string) (*tls.Config, error) {
cert, err := tls.LoadX509KeyPair(certFile, privKeyFile)
if err != nil {
return nil, fmt.Errorf("error generating x509 certs for ovndbapi: %s", err)
}
caCert, err := os.ReadFile(caCertFile)
if err != nil {
return nil, fmt.Errorf("error generating ca certs for ovndbapi: %s", err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
ServerName: serverName,
}
return tlsConfig, nil
}
// Watch TLS key/cert files, and update the ovndb tlsConfig Certificate.
// Call ovndbclient.Close() will disconnect underlying rpc2client connection.
// With ovndbclient initalized with reconnect flag, rcp2client will reconnct with new tlsConfig Certificate.
func newSSLKeyPairWatcherFunc(certFile, privKeyFile string, tlsConfig *tls.Config) (func(client.Client, <-chan struct{}), error) {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
if err := watcher.Add(certFile); err != nil {
return nil, err
}
if err := watcher.Add(privKeyFile); err != nil {
return nil, err
}
fn := func(client client.Client, stopChan <-chan struct{}) {
for {
select {
case event, ok := <-watcher.Events:
if ok && event.Op&(fsnotify.Write|fsnotify.Remove) != 0 {
if event.Op&fsnotify.Remove != 0 {
// cert/key file removed, need wait for the file to be created again.
if err := wait.PollUntilContextTimeout(context.Background(), 10*time.Millisecond, 5*time.Second, true, func(ctx context.Context) (bool, error) {
if _, err := os.Stat(event.Name); os.IsNotExist(err) {
return false, nil
}
return true, nil
}); err != nil {
klog.Errorf("Fatal error: timeout waiting for %s to be created", event.Name)
os.Exit(1)
}
if err := watcher.Add(event.Name); err != nil {
klog.Errorf("Cannot add %s back to watcher, err: %s", event.Name, err)
os.Exit(1)
}
}
cert, err := tls.LoadX509KeyPair(certFile, privKeyFile)
if err != nil {
klog.Infof("Cannot load new cert with cert %s key %s err %s", certFile, privKeyFile, err)
continue
}
if reflect.DeepEqual(tlsConfig.Certificates, []tls.Certificate{cert}) {
klog.Infof("TLS update already finished")
continue
}
tlsConfig.Certificates = []tls.Certificate{cert}
client.Disconnect()
klog.Infof("TLS connection to %s force reconnected with new TLS config", client.Schema().Name)
// We do not call client.Connect() as reconnection is handled in the reconnect goroutine
}
case err, ok := <-watcher.Errors:
if ok {
klog.Errorf("Error watching for changes: %s", err)
}
case <-stopChan:
err := watcher.Close()
if err != nil {
klog.Errorf("Error closing watcher: %s", err)
}
return
}
}
}
return fn, nil
}