/
database.go
285 lines (249 loc) · 7.43 KB
/
database.go
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package main
import (
"context"
"encoding/json"
"github.com/pkg/errors"
"github.com/rs/zerolog/log"
"go.etcd.io/etcd/api/v3/mvccpb"
v3 "go.etcd.io/etcd/client/v3"
"strconv"
"strings"
"time"
)
const EtcdTimeout = 5 * time.Second
const EtcdMaxTimeout = 5 * time.Minute
const EtcdJitter = 50 * time.Millisecond
const EtcdLeaseTTL = 3
const EtcdVniPrefix = "/wmgwd/vni"
const EtcdVniTypeSuffix = "type"
const EtcdVniCurrentSuffix = "current"
const EtcdVniNextSuffix = "next"
const EtcdNodePrefix = "/wmgwd/node/"
type Database struct {
client *v3.Client
node string
lease v3.LeaseID
pool *VniUpdateWorkerPool
}
type VniStateType int
const (
Unassigned VniStateType = iota
Idle
MigrationDecided
MigrationConfirmed
MigrationOspfAdvertised
MigrationOspfWithdrawn
MigrationArpEnabled
MigrationArpDisabled
MigrationGratuitousArpSent
MigrationEvpnWithdrawn
FailoverDecided
NumStateTypes
)
func createLease(ctx context.Context, client *v3.Client) (*v3.LeaseGrantResponse, error) {
ctx, cancel := context.WithTimeout(ctx, EtcdTimeout)
defer cancel()
lease, err := client.Grant(ctx, EtcdLeaseTTL)
if err != nil {
return nil, err
}
return lease, nil
}
func NewDatabase(config Configuration) (*Database, error) {
endpoint := config.EtcdEndpoint
if endpoint == "" {
endpoint = "http://localhost:2379"
}
client, err := v3.New(v3.Config{
Endpoints: []string{endpoint},
})
if err != nil {
return nil, err
}
return &Database{client: client, node: config.Name, pool: NewVniUpdateWorkerPool(NumVniUpdateWorkers)}, nil
}
func (db *Database) CreateLeaseAndKeepalive(ctx context.Context) (<-chan *v3.LeaseKeepAliveResponse, context.CancelFunc, error) {
ctx, cancel := context.WithCancel(ctx)
lease, err := createLease(ctx, db.client)
if err != nil {
cancel()
return nil, nil, err
}
db.lease = lease.ID
respChan, err := db.client.KeepAlive(ctx, db.lease)
if err != nil {
cancel()
return nil, nil, err
}
return respChan, cancel, nil
}
func (db *Database) Close() {
ctx, cancel := context.WithTimeout(context.Background(), EtcdTimeout)
defer cancel()
if db.lease != 0 {
_, err := db.client.Revoke(ctx, db.lease)
if err != nil {
log.Error().Err(err).Msg("could not revoke lease")
}
}
err := db.client.Close()
if err != nil {
log.Error().Err(err).Msg("could not close client")
}
}
type Node struct {
Name string
Lease v3.LeaseID
Uids []uint64
}
func (db *Database) Nodes(ctx context.Context) ([]Node, error) {
ctx, cancel := context.WithTimeout(ctx, EtcdTimeout)
defer cancel()
resp, err := db.client.Get(ctx, EtcdNodePrefix, v3.WithPrefix(), v3.WithSerializable())
if err != nil {
return nil, errors.Wrap(err, "could not get from etcd")
}
nodes := make([]Node, len(resp.Kvs))
for i, kv := range resp.Kvs {
var uids []uint64
err = json.Unmarshal(kv.Value, &uids)
if err != nil {
return nil, errors.Wrap(err, "could not unmarshal uids")
}
name := strings.TrimPrefix(string(kv.Key), EtcdNodePrefix)
nodes[i] = Node{Name: name, Lease: v3.LeaseID(kv.Lease), Uids: uids}
}
return nodes, nil
}
func (db *Database) Register(node string, uids []uint64) error {
ctx, cancel := context.WithTimeout(context.Background(), EtcdTimeout)
defer cancel()
serialized, err := json.Marshal(uids)
if err != nil {
log.Fatal().Err(err).Msg("could not marshal uids")
}
_, err = db.client.Put(ctx, EtcdNodePrefix+node, string(serialized), v3.WithLease(db.lease))
return errors.Wrap(err, "could not put to etcd")
}
func (db *Database) Unregister(node string) error {
ctx, cancel := context.WithTimeout(context.Background(), EtcdTimeout)
defer cancel()
_, err := db.client.Delete(ctx, EtcdNodePrefix+node)
return errors.Wrap(err, "could not delete from etcd")
}
func stateTypeToString(state VniStateType) string {
switch state {
case Unassigned:
return "unassigned"
case Idle:
return "idle"
case MigrationDecided:
return "migration-decided"
case MigrationConfirmed:
return "migration-confirmed"
case MigrationOspfAdvertised:
return "migration-ospf-advertised"
case MigrationOspfWithdrawn:
return "migration-ospf-withdrawn"
case MigrationArpEnabled:
return "migration-arp-enabled"
case MigrationArpDisabled:
return "migration-arp-disabled"
case MigrationGratuitousArpSent:
return "migration-gratuitous-arp-sent"
case MigrationEvpnWithdrawn:
return "migration-evpn-withdrawn"
case FailoverDecided:
return "failover-decided"
default:
return "unknown"
}
}
func (db *Database) GetFullState(ctx context.Context, config Configuration, revision int64) (map[uint64]*VniState, error) {
ctx, cancel := context.WithTimeout(ctx, EtcdTimeout)
defer cancel()
ops := []v3.OpOption{v3.WithPrefix(), v3.WithSerializable()}
if revision != -1 {
ops = append(ops, v3.WithRev(revision))
}
resp, err := db.client.Get(ctx, EtcdVniPrefix+"/", ops...)
if err != nil {
return nil, err
}
states := make(map[uint64]*VniState)
for _, vni := range config.Vnis {
states[vni] = &VniState{Type: Unassigned}
}
for _, kv := range resp.Kvs {
keyVni, err := db.VniFromKv(kv)
if err != nil {
return nil, errors.Wrap(err, "could not get keyVni from kv")
}
suffix := strings.TrimPrefix(string(kv.Key), EtcdVniPrefix+"/"+strconv.FormatUint(keyVni, 10)+"/")
if suffix == EtcdVniTypeSuffix {
value, err := strconv.Atoi(string(kv.Value))
if err != nil || value < 0 || value >= int(NumStateTypes) {
return nil, errors.New("invalid state type")
}
states[keyVni].Type = VniStateType(value)
} else if suffix == EtcdVniCurrentSuffix {
states[keyVni].Current = string(kv.Value)
} else if suffix == EtcdVniNextSuffix {
states[keyVni].Next = string(kv.Value)
} else {
return nil, errors.New("invalid suffix")
}
}
for _, vni := range config.Vnis {
states[vni].Revision = resp.Header.Revision
}
return states, nil
}
func (db *Database) GetState(vni uint64, revision int64) (VniState, error) {
ctx, cancel := context.WithTimeout(context.Background(), EtcdTimeout)
defer cancel()
ops := []v3.OpOption{v3.WithPrefix()}
if revision != -1 {
ops = append(ops, v3.WithRev(revision))
}
ops = append(ops, v3.WithSerializable())
resp, err := db.client.Get(ctx, EtcdVniPrefix+"/"+strconv.FormatUint(vni, 10)+"/", ops...)
if err != nil {
return VniState{}, err
}
state := VniState{Revision: resp.Header.Revision}
for _, kv := range resp.Kvs {
suffix := strings.TrimPrefix(string(kv.Key), EtcdVniPrefix+"/"+strconv.FormatUint(vni, 10)+"/")
if suffix == EtcdVniTypeSuffix {
value, err := strconv.Atoi(string(kv.Value))
if err != nil || value < 0 || value >= int(NumStateTypes) {
return VniState{}, errors.New("invalid state type")
}
state.Type = VniStateType(value)
} else if suffix == EtcdVniCurrentSuffix {
state.Current = string(kv.Value)
} else if suffix == EtcdVniNextSuffix {
state.Next = string(kv.Value)
} else {
return VniState{}, errors.New("invalid suffix")
}
}
return state, nil
}
var InvalidKey = errors.New("invalid key")
func (db *Database) VniFromKv(kv *mvccpb.KeyValue) (uint64, error) {
keyRest := strings.TrimPrefix(string(kv.Key), EtcdVniPrefix+"/")
parts := strings.Split(keyRest, "/")
if len(parts) != 2 {
return 0, InvalidKey
}
parsedVni, err := strconv.ParseUint(parts[0], 10, 64)
if err != nil {
log.Error().Str("key", string(kv.Key)).Str("vni", keyRest).Err(err).Msg("vni-watcher: failed to parse vni")
return 0, InvalidKey
}
return parsedVni, nil
}
func (db *Database) NewVniUpdate(vni uint64) *VniUpdate {
return &VniUpdate{db: db, vni: vni, revision: -1}
}