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This commit is contained in:
Mikaël Cluseau 2022-12-05 10:26:49 +01:00
commit f7fb147918
13 changed files with 1530 additions and 0 deletions
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122
client.go Normal file
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package etcdb
import (
"crypto/tls"
"crypto/x509"
"flag"
"fmt"
"io/ioutil"
"log"
"strings"
etcdclient "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/namespace"
)
type ClientSpec struct {
URLs string
Prefix string
TLS TLSSpec
//User string
//Password string
client *etcdclient.Client
}
type TLSSpec struct {
CAPath string
KeyPath string
CertPath string
}
func (spec *ClientSpec) BindFlags(name string) {
flag.StringVar(&spec.URLs, name+"-etcd-urls", spec.URLs, "comma-separated etcd URLs ("+name+" cluster)")
flag.StringVar(&spec.Prefix, name+"-etcd-prefix", spec.Prefix, "etcd prefix ("+name+" cluster)")
// TLS flags
flag.StringVar(&spec.TLS.CAPath, name+"-ca", spec.TLS.CAPath, "etcd CA path ("+name+" cluster)")
flag.StringVar(&spec.TLS.KeyPath, name+"-key", spec.TLS.KeyPath, "etcd key path ("+name+" cluster)")
flag.StringVar(&spec.TLS.CertPath, name+"-crt", spec.TLS.CertPath, "etcd certificate path ("+name+" cluster)")
}
func (spec *ClientSpec) MustConnect() {
err := spec.Connect()
if err != nil {
log.Fatal("etcd failed to connect: ", err)
}
}
func (spec *ClientSpec) Connect() error {
cfg := etcdclient.Config{
Endpoints: strings.Split(spec.URLs, ","),
}
if caPath := spec.TLS.CAPath; caPath != "" {
if cfg.TLS == nil {
cfg.TLS = &tls.Config{}
}
caData, err := ioutil.ReadFile(caPath)
if err != nil {
return fmt.Errorf("failed to read CA file: %w", err)
}
cfg.TLS.RootCAs = x509.NewCertPool()
if !cfg.TLS.RootCAs.AppendCertsFromPEM(caData) {
return fmt.Errorf("no certificates found in %s", caPath)
}
}
if spec.TLS.KeyPath != "" || spec.TLS.CertPath != "" {
if cfg.TLS == nil {
cfg.TLS = &tls.Config{}
}
cert, err := tls.LoadX509KeyPair(spec.TLS.CertPath, spec.TLS.KeyPath)
if err != nil {
return fmt.Errorf("failed to load client key pair: %w", err)
}
cfg.TLS.Certificates = []tls.Certificate{cert}
}
client, err := etcdclient.New(cfg)
if err != nil {
return fmt.Errorf("failed to build client: %w", err)
}
prefix := spec.Prefix
if prefix != "" && !strings.HasSuffix(prefix, "/") {
prefix += "/"
}
client.KV = namespace.NewKV(client.KV, prefix)
client.Watcher = namespace.NewWatcher(client.Watcher, prefix)
client.Lease = namespace.NewLease(client.Lease, prefix)
spec.client = client
return nil
}
func (spec *ClientSpec) Client() *etcdclient.Client {
if spec.client == nil {
panic("no client, Connect() no called?")
}
client := &etcdclient.Client{}
*client = *spec.client
return client
}
func (spec *ClientSpec) Root() EtcdSpec {
return EtcdSpec{
client: spec,
}
}
func (spec *ClientSpec) Sub(prefix string) EtcdSpec {
return EtcdSpec{
client: spec,
}.Sub(prefix)
}

23
codec.go Normal file
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package etcdb
import (
"encoding/json"
)
type Codec interface {
Encode(v any) ([]byte, error)
Decode(raw []byte, v any) error
}
// ------------------------------------------------------------------------
type jsonCodec struct{}
var JSONCodec Codec = jsonCodec{}
func (_ jsonCodec) Encode(v any) ([]byte, error) {
return json.Marshal(v)
}
func (_ jsonCodec) Decode(raw []byte, v any) error {
return json.Unmarshal(raw, v)
}

73
e2e/e2e.go Normal file
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package main
import (
"context"
"flag"
"log"
"novit.tech/go/etcdb"
"novit.tech/go/etcdb/leader"
)
var (
Normal = etcdb.ClientSpec{
URLs: "http://127.0.0.1:2379",
Prefix: "etcdbl/",
}
Secure = etcdb.ClientSpec{
URLs: "http://127.0.0.1:2379",
Prefix: "etcdbs/",
}
data = etcdb.Encrypted(Secure.Sub("encset/"))
myInt = etcdb.SingletonSpec[int]{Spec: data, Key: "my-int"}
myStrings = etcdb.SetSpec[string]{Spec: data.Sub("my-strings")}
data2 = etcdb.Encrypted(Secure.Sub("encset/"))
myStrings2 = etcdb.SetSpec[string]{Spec: data2.Sub("my-strings")}
myLeader = leader.Spec{
Etcd: &Normal,
Election: "my-leader",
OnLeader: onLeader,
}
)
func main() {
flag.Parse()
Normal.MustConnect()
Secure.MustConnect()
myLeader.RunProcess()
}
func onLeader(ctx context.Context) {
if err := data.Unlock(ctx, []byte("uifee6ooB")); err != nil {
log.Print("failed to unlock: ", err)
}
data.AddKey(ctx, []byte("xish1yaiG"))
if err := data2.Unlock(ctx, []byte("xish1yaiG")); err != nil {
log.Print("failed to unlock 2nd set: ", err)
}
v := "value"
if true {
d1 := myStrings.In(ctx)
err := d1.Put("key", v)
log.Printf("d1[key] => err=%v %q", err, v)
}
if true {
d2 := myStrings2.In(ctx)
v, ok, err := d2.Get("key")
log.Printf("d2[key] => ok=%v err=%v value=%q", ok, err, v)
}
<-ctx.Done()
log.Print("leader context done")
}

387
encrypted-set.go Normal file
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package etcdb
import (
"context"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha512"
"encoding/base64"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"log"
"strings"
"sync"
"syscall"
"golang.org/x/crypto/argon2"
)
// encrypted key hash -> master key
func Encrypted(spec EtcdSpec) *EncryptedSpec {
v := &EncryptedSpec{
keys: spec.Sub("keys/"),
data: spec.Sub("data/"),
}
v.l.Lock()
return v
}
type EncryptedSpec struct {
l sync.Mutex
keys,
data EtcdSpec
masterKey []byte // TODO syscall.MemSecret when kernels are up to date
salt1, salt2 []byte
}
func (es *EncryptedSpec) keyPairFromPassword(password []byte) (key, pub []byte) {
key = argon2.IDKey(password, es.salt1, 1, 64*1024, 4, 32)
pub = argon2.IDKey(key, es.salt2, 1, 64*1024, 4, 32)
return
}
func (es *EncryptedSpec) keysIn(ctx context.Context) DB {
return HexDB{es.keys.In(ctx)}
}
func (es *EncryptedSpec) loadSalts(ctx context.Context) error {
if es.salt1 != nil && es.salt2 != nil {
return nil
}
keySet := es.keysIn(ctx)
for _, i := range []struct {
key string
target *[]byte
}{
{"salt1", &es.salt1},
{"salt2", &es.salt2},
} {
v, ok, err := keySet.Get(i.key)
if err != nil {
return err
}
if !ok {
v = make([]byte, 64)
readRandom(v)
keySet.Put(i.key, v)
}
*i.target = v
}
return nil
}
func (es *EncryptedSpec) IsOpen() bool {
return len(es.masterKey) != 0
}
func (es *EncryptedSpec) WaitOpen() {
es.l.Lock()
es.l.Unlock()
}
func (es *EncryptedSpec) SetMasterKey(key []byte) {
if len(key) != 32 {
panic("wrong key size")
}
defer memzero(key)
masterKey := make([]byte, 32)
if err := syscall.Mlock(masterKey); err != nil {
panic(fmt.Errorf("mlock(masterKey) failed: %w", err))
}
for i := range key {
masterKey[i] = key[i]
}
es.l.Unlock()
}
func (es *EncryptedSpec) Unlock(ctx context.Context, password []byte) (err error) {
err = es.loadSalts(ctx)
if err != nil {
return
}
key, pubKey := es.keyPairFromPassword(password)
memzero(password)
defer memzero(key)
keySet := es.keysIn(ctx)
hasKey := false
keySet.ForEach(func(k string, _ []byte) (cont bool) {
if strings.HasPrefix(k, "0x") {
hasKey = true
}
return !hasKey
})
masterKey := make([]byte, 32)
if err = syscall.Mlock(masterKey); err != nil {
return fmt.Errorf("mlock(masterKey) failed: %w", err)
}
if !hasKey {
// no keys, initialize
readRandom(masterKey)
encryptedMaster := aesEncrypt(masterKey, key)
err = keySet.Put("0x"+hex.EncodeToString(pubKey), encryptedMaster)
if err != nil {
return
}
es.masterKey = masterKey
es.l.Unlock()
return
}
// has keys, lookup the key
encryptedMaster, ok, err := keySet.Get("0x" + hex.EncodeToString(pubKey))
if err != nil {
return
}
if !ok {
err = fmt.Errorf("no such key")
return
}
aesDecryptTo(masterKey, encryptedMaster, key)
es.masterKey = masterKey
es.l.Unlock()
return
}
func (es *EncryptedSpec) Lock() {
if !es.l.TryLock() {
panic("double lock")
}
memzero(es.masterKey)
syscall.Munlock(es.masterKey)
es.masterKey = nil
}
func (es *EncryptedSpec) AddKey(ctx context.Context, password []byte) error {
if es.masterKey == nil {
panic("no masterKey")
}
key, pubKey := es.keyPairFromPassword(password)
memzero(password)
encryptedMaster := func() []byte {
defer memzero(key)
return aesEncrypt(es.masterKey, key)
}()
return es.keysIn(ctx).Put("0x"+hex.EncodeToString(pubKey), encryptedMaster)
}
func (es *EncryptedSpec) In(ctx context.Context) DB {
return EncryptedDB{
es: es,
wrappedDB: es.data.In(ctx),
}
}
func (es *EncryptedSpec) Sub(prefix string) EncryptedSubSpec {
return EncryptedSubSpec{
es: es,
data: es.data.Sub(prefix),
}
}
type EncryptedSubSpec struct {
es *EncryptedSpec
data EtcdSpec
}
func (spec EncryptedSubSpec) In(ctx context.Context) DB {
return EncryptedDB{
es: spec.es,
wrappedDB: spec.data.In(ctx),
}
}
type EncryptedDB struct {
es *EncryptedSpec
wrappedDB DB
}
func (e EncryptedDB) obscureKey(keyBytes []byte) string {
h := sha512.Sum512(keyBytes)
return base64.RawStdEncoding.EncodeToString(h[:])
}
func (e EncryptedDB) encodeKV(key string, value []byte) (outKey string, outValue []byte, err error) {
keyBytes := []byte(key)
if len(keyBytes) > 0xffff {
err = errors.New("key too long")
return
}
outKey = e.obscureKey(keyBytes)
outValue = make([]byte, 0, 2+len(key)+len(value))
outValue = binary.BigEndian.AppendUint16(outValue, uint16(len(key)))
outValue = append(outValue, keyBytes...)
outValue = append(outValue, value...)
outValue = aesEncrypt(outValue, e.es.masterKey)
return
}
func (e EncryptedDB) decodeKV(encryptedKV []byte) (key string, value []byte, err error) {
kv := aesDecrypt(encryptedKV, e.es.masterKey)
if len(kv) < 2 {
err = errors.New("value too short for key len")
return
}
keyLen := int(binary.BigEndian.Uint16(kv[:2]))
kv = kv[2:]
if len(kv) < keyLen {
err = errors.New("value too short for key")
return
}
key = string(kv[:keyLen])
value = kv[keyLen:]
return
}
func (e EncryptedDB) Get(key string) (value []byte, ok bool, err error) {
encryptedValue, ok, err := e.wrappedDB.Get(e.obscureKey([]byte(key)))
if !ok || err != nil {
return
}
_, value, err = e.decodeKV(encryptedValue)
return
}
func (e EncryptedDB) Put(key string, value []byte) error {
dbKey, encryptedValue, err := e.encodeKV(key, value)
if err != nil {
return err
}
return e.wrappedDB.Put(dbKey, encryptedValue)
}
func (e EncryptedDB) Del(key string) error {
return e.wrappedDB.Del(e.obscureKey([]byte(key)))
}
func (e EncryptedDB) ForEach(callback func(key string, value []byte) (cont bool)) (err error) {
forEachErr := e.wrappedDB.ForEach(func(key string, encryptedValue []byte) (cont bool) {
realKey, value, decodeErr := e.decodeKV(encryptedValue)
if decodeErr != nil {
err = fmt.Errorf("failed to decode value under key %q: %w", key, decodeErr)
return false
}
return callback(realKey, value)
})
if err != nil {
return
}
return forEachErr
}
func (e EncryptedDB) Watch(rev int64) <-chan WatchEvent {
ch := make(chan WatchEvent, 1)
go func() {
defer close(ch)
inCh := e.wrappedDB.Watch(rev)
for evt := range inCh {
encryptedValue := evt.Value
evt.Value = nil
if len(encryptedValue) == 0 {
ch <- evt
continue
}
realKey, value, err := e.decodeKV(encryptedValue)
if err != nil {
evt.Err = fmt.Errorf("failed to decode value: %w", err)
ch <- evt
continue
}
evt.Key = realKey
evt.Value = value
ch <- evt
}
}()
return ch
}
func aesEncrypt(data, key []byte) []byte {
c, err := aes.NewCipher(key)
if err != nil {
panic(fmt.Errorf("failed to init AES: %w", err))
}
// output = initialization vector + encrypted data
const ivSize = aes.BlockSize
output := make([]byte, ivSize+len(data))
iv := output[:ivSize]
readRandom(iv)
cipher.NewCFBEncrypter(c, iv).XORKeyStream(output[ivSize:], data)
return output
}
func aesDecrypt(data, key []byte) []byte {
dst := make([]byte, len(data)-aes.BlockSize)
aesDecryptTo(dst, data, key)
return dst
}
func aesDecryptTo(dst, data, key []byte) {
c, err := aes.NewCipher(key)
if err != nil {
panic(fmt.Errorf("failed to init AES: %w", err))
}
const ivSize = aes.BlockSize
iv := data[:ivSize]
cipher.NewCFBDecrypter(c, iv).XORKeyStream(dst, data[ivSize:])
}
func readRandom(dst []byte) {
if _, err := io.ReadFull(rand.Reader, dst); err != nil {
log.Panic("failed to read random bytes: ", err)
}
}
func memzero(ba []byte) {
for i := range ba {
ba[i] = 0
}
}

171
etcd-spec.go Normal file
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package etcdb
import (
"context"
"fmt"
"strings"
etcdclient "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/mirror"
"go.etcd.io/etcd/client/v3/namespace"
)
type EtcdSpec struct {
client *ClientSpec
prefix string
}
func (spec EtcdSpec) Sub(prefix string) EtcdSpec {
p := spec.prefix + prefix
if !strings.HasSuffix(p, "/") {
p += "/"
}
return EtcdSpec{
client: spec.client,
prefix: p,
}
}
func (spec EtcdSpec) In(ctx context.Context) DB {
client := spec.client.Client()
client.KV = namespace.NewKV(client.KV, spec.prefix)
client.Watcher = namespace.NewWatcher(client.Watcher, spec.prefix)
client.Lease = namespace.NewLease(client.Lease, spec.prefix)
return EtcdDB{
client: client,
ctx: ctx,
}
}
type EtcdDB struct {
client *etcdclient.Client
ctx context.Context
}
func (db EtcdDB) Get(key string) (value []byte, ok bool, err error) {
get, err := db.client.KV.Get(db.ctx, key)
if err != nil {
return
}
if len(get.Kvs) == 0 {
return
}
value = get.Kvs[0].Value
ok = true
return
}
func (db EtcdDB) Put(key string, val []byte) (err error) {
_, err = db.client.KV.Put(db.ctx, key, string(val))
return
}
func (db EtcdDB) Del(key string) (err error) {
_, err = db.client.KV.Delete(db.ctx, key)
return
}
func (db EtcdDB) ForEach(callback func(key string, value []byte) (cont bool)) (err error) {
withSort := etcdclient.WithSort(etcdclient.SortByKey, etcdclient.SortAscend)
opts := []etcdclient.OpOption{withSort, etcdclient.WithFromKey()}
key := "\x00"
for {
get, err := db.client.KV.Get(db.ctx, key, opts...)
if err != nil {
return err
}
for _, kv := range get.Kvs {
cont := callback(string(kv.Key), kv.Value)
if !cont {
return nil
}
}
if !get.More {
return nil
}
// wait, there's more!
key = string(append(get.Kvs[len(get.Kvs)-1].Key, 0))
}
}
func (db EtcdDB) Watch(rev int64) <-chan WatchEvent {
ch := make(chan WatchEvent, 1)
go func() {
defer close(ch)
sync := mirror.NewSyncer(db.client, "", rev)
gets, errs := sync.SyncBase(db.ctx)
var maxRev int64
for get := range gets {
for _, kv := range get.Kvs {
ch <- WatchEvent{
Key: string(kv.Key),
Value: kv.Value,
}
}
if get.Header.Revision > maxRev {
maxRev = get.Header.Revision
}
}
err, _ := <-errs
if err != nil {
ch <- WatchEvent{Err: err}
return
}
if maxRev != 0 {
ch <- WatchEvent{NewRev: maxRev}
}
watchChan := sync.SyncUpdates(db.ctx)
for watchEvent := range watchChan {
for _, evt := range watchEvent.Events {
switch evt.Type {
case etcdclient.EventTypePut:
ch <- WatchEvent{
Key: string(evt.Kv.Key),
Value: evt.Kv.Value,
}
case etcdclient.EventTypeDelete:
ch <- WatchEvent{
Key: string(evt.Kv.Key),
Delete: true,
Value: evt.Kv.Value,
}
default:
ch <- WatchEvent{
Err: fmt.Errorf("unknown event type: %d", evt.Type),
}
}
}
err := watchEvent.Err()
if err == nil {
ch <- WatchEvent{
NewRev: watchEvent.Header.Revision,
}
} else {
ch <- WatchEvent{
Err: err,
}
}
}
}()
return ch
}

186
etcdb.go Normal file
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package etcdb
import (
"bytes"
"context"
"fmt"
"path"
)
func Prefix(names ...string) string {
return path.Join(names...) + "/"
}
type Spec interface {
In(ctx context.Context) DB
}
type DB interface {
Get(key string) (value []byte, ok bool, err error)
Put(key string, value []byte) error
Del(key string) error
ForEach(callback func(key string, value []byte) (cont bool)) error
Watch(rev int64) <-chan WatchEvent
}
type WatchEvent struct {
Err error
Key string
Value []byte
Delete bool
NewRev int64
}
type TypedDB[T any] struct {
DB DB
Codec Codec
}
type TypedWatchEvent[T any] struct {
Err error
Key string
Value T
Delete bool
NewRev int64
}
func (e *TypedWatchEvent[T]) FromEvent(evt WatchEvent) {
e.Err = evt.Err
e.Key = evt.Key
e.Delete = evt.Delete
e.NewRev = evt.NewRev
}
func (tdb TypedDB[T]) Get(key string) (v T, ok bool, err error) {
raw, ok, err := tdb.DB.Get(key)
if err != nil {
return
}
if !ok {
return
}
err = tdb.Codec.Decode(raw, &v)
if err != nil {
err = fmt.Errorf("invalid value: %w", err)
ok = false
return
}
ok = true
return
}
func (tdb TypedDB[T]) Put(key string, value T) (err error) {
ba, err := tdb.Codec.Encode(value)
if err != nil {
err = fmt.Errorf("failed to encode value: %w", err)
return
}
return tdb.DB.Put(key, ba)
}
func (tdb TypedDB[T]) Del(key string) error {
return tdb.DB.Del(key)
}
func (tdb TypedDB[T]) ForEach(callback func(key string, value T) (cont bool)) (err error) {
forEachErr := tdb.DB.ForEach(func(key string, encodedValue []byte) (cont bool) {
value := new(T)
if err := tdb.Codec.Decode(encodedValue, value); err != nil {
err = fmt.Errorf("invalid value at %q: %w", key, err)
return false
}
return callback(key, *value)
})
if err == nil && forEachErr != nil {
err = forEachErr
return
}
return
}
func (tdb TypedDB[T]) Watch(rev int64) <-chan TypedWatchEvent[T] {
ch := make(chan TypedWatchEvent[T], 1)
go func() {
defer close(ch)
inCh := tdb.DB.Watch(rev)
for evt := range inCh {
tevt := TypedWatchEvent[T]{}
tevt.FromEvent(evt)
if len(evt.Value) == 0 {
ch <- tevt
continue
}
value := new(T)
if err := tdb.Codec.Decode(evt.Value, value); err != nil {
tevt.Err = fmt.Errorf("invalid value: %w", err)
ch <- tevt
continue
}
tevt.Value = *value
ch <- tevt
}
}()
return ch
}
func (tdb TypedDB[T]) Sync(allData map[string]T) (err error) {
encodedData := map[string][]byte{}
for k, v := range allData {
encodedData[k], err = tdb.Codec.Encode(v)
if err != nil {
err = fmt.Errorf("failed to encode data[%q]: %w", k, err)
return
}
}
seen := make(map[string]bool, len(allData))
forEachErr := tdb.DB.ForEach(func(key string, v []byte) (cont bool) {
seen[key] = true
newV, ok := encodedData[key]
if ok {
if !bytes.Equal(newV, v) {
err = tdb.DB.Put(key, newV)
}
} else {
err = tdb.Del(key)
}
return err == nil
})
if err == nil && forEachErr != nil {
err = forEachErr
}
if err != nil {
return
}
// add any missing data
for k, v := range encodedData {
if seen[k] {
continue
}
err = tdb.DB.Put(k, v)
if err != nil {
return
}
}
return
}

26
go.mod Normal file
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module novit.tech/go/etcdb
go 1.19
require (
go.etcd.io/etcd/client/v3 v3.5.5
golang.org/x/crypto v0.1.0
)
require (
github.com/coreos/go-semver v0.3.0 // indirect
github.com/coreos/go-systemd/v22 v22.4.0 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang/protobuf v1.5.2 // indirect
go.etcd.io/etcd/api/v3 v3.5.5 // indirect
go.etcd.io/etcd/client/pkg/v3 v3.5.5 // indirect
go.uber.org/atomic v1.10.0 // indirect
go.uber.org/multierr v1.8.0 // indirect
go.uber.org/zap v1.23.0 // indirect
golang.org/x/net v0.1.0 // indirect
golang.org/x/sys v0.1.0 // indirect
golang.org/x/text v0.4.0 // indirect
google.golang.org/genproto v0.0.0-20221025140454-527a21cfbd71 // indirect
google.golang.org/grpc v1.50.1 // indirect
google.golang.org/protobuf v1.28.1 // indirect
)

283
go.sum Normal file
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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go.etcd.io/etcd/api/v3 v3.5.5/go.mod h1:KFtNaxGDw4Yx/BA4iPPwevUTAuqcsPxzyX8PHydchN8=
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golang.org/x/crypto v0.1.0 h1:MDRAIl0xIo9Io2xV565hzXHw3zVseKrJKodhohM5CjU=
golang.org/x/crypto v0.1.0/go.mod h1:RecgLatLF4+eUMCP1PoPZQb+cVrJcOPbHkTkbkB9sbw=
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golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
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golang.org/x/net v0.1.0 h1:hZ/3BUoy5aId7sCpA/Tc5lt8DkFgdVS2onTpJsZ/fl0=
golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
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golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
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google.golang.org/grpc v1.50.1 h1:DS/BukOZWp8s6p4Dt/tOaJaTQyPyOoCcrjroHuCeLzY=
google.golang.org/grpc v1.50.1/go.mod h1:ZgQEeidpAuNRZ8iRrlBKXZQP1ghovWIVhdJRyCDK+GI=
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google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

91
hex-db.go Normal file
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@ -0,0 +1,91 @@
package etcdb
import (
"encoding/hex"
"fmt"
)
type HexDB struct {
WrappedDB DB
}
var _ DB = HexDB{}
func (h HexDB) Get(key string) (value []byte, ok bool, err error) {
encodedValue, ok, err := h.WrappedDB.Get(key)
if !ok || err != nil {
return
}
value = make([]byte, hex.DecodedLen(len(encodedValue)))
_, err = hex.Decode(value, encodedValue)
if err != nil {
err = fmt.Errorf("invalid hex-encoded value: %w", err)
ok = false
}
return
}
func (h HexDB) Put(key string, value []byte) (err error) {
encodedValue := make([]byte, hex.EncodedLen(len(value)))
hex.Encode(encodedValue, value)
return h.WrappedDB.Put(key, encodedValue)
}
func (h HexDB) Del(key string) error {
return h.WrappedDB.Del(key)
}
func (h HexDB) ForEach(callback func(key string, value []byte) (cont bool)) (err error) {
forEachErr := h.WrappedDB.ForEach(func(key string, encodedValue []byte) (cont bool) {
value := make([]byte, hex.DecodedLen(len(encodedValue)))
_, err = hex.Decode(value, encodedValue)
if err != nil {
err = fmt.Errorf("invalid hex-encoded value under %q: %w", key, err)
return false
}
return callback(key, value)
})
if err == nil && forEachErr != nil {
err = forEachErr
}
return
}
func (h HexDB) Watch(rev int64) <-chan WatchEvent {
ch := make(chan WatchEvent, 1)
go func() {
defer close(ch)
inCh := h.WrappedDB.Watch(rev)
for evt := range inCh {
if len(evt.Value) == 0 {
ch <- evt
continue
}
value := make([]byte, hex.DecodedLen(len(evt.Value)))
_, err := hex.Decode(value, evt.Value)
if err != nil {
ch <- WatchEvent{
Key: evt.Key,
Err: fmt.Errorf("invalid hex-encoded value: %w", err),
}
continue
}
evt.Value = value
ch <- evt
}
}()
return ch
}

123
leader/leader.go Normal file
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@ -0,0 +1,123 @@
package leader
import (
"context"
"flag"
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"time"
"go.etcd.io/etcd/client/v3/concurrency"
"novit.tech/go/etcdb"
)
var leaderName string
func init() {
hostname, err := os.Hostname()
if err != nil {
panic("failed to get hostname: " + err.Error())
}
leaderName = hostname
flag.StringVar(&leaderName, "leader-name", leaderName, "leader name in leader election")
}
type Spec struct {
Etcd *etcdb.ClientSpec
Election string
OnLeader func(ctx context.Context)
}
// RunProcess is design for processes that are a single leader. Binds signals to exit gracefully.
func (spec *Spec) RunProcess() {
ctx, cancel := context.WithCancel(context.Background())
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
s := <-c
log.Print("got signal ", s)
cancel()
<-c
log.Print("2nd signal, forced exit")
os.Exit(0)
}()
spec.Run(ctx)
}
func (spec *Spec) Run(ctx context.Context) {
for {
err := spec.runSession(ctx)
if err != nil {
log.Print("leader election: failed: ", err)
}
if ctx.Err() != nil {
break
}
time.Sleep(time.Second)
}
}
func (spec *Spec) runSession(ctx context.Context) (err error) {
cli := spec.Etcd.Client()
runCtx, runCancel := context.WithCancel(context.Background())
defer runCancel()
s, err := concurrency.NewSession(
cli,
concurrency.WithTTL(5),
concurrency.WithContext(runCtx),
)
if err != nil {
return fmt.Errorf("failed to start leader election: %v", err)
}
defer s.Close()
election := concurrency.NewElection(s, spec.Election)
log.Print("leader election: waiting to become leader")
if err := election.Campaign(ctx, leaderName); err != nil {
return fmt.Errorf("leader election: campaign failed: %v", err)
}
log.Print("leader election: got leader status")
leaderCtx, cancel := context.WithCancel(ctx)
wg := new(sync.WaitGroup)
wg.Add(1)
go func() {
defer wg.Done()
spec.OnLeader(leaderCtx)
}()
select {
case <-s.Done():
log.Print("leader election: session done")
case <-ctx.Done():
log.Print("leader election: context cancelled")
}
cancel()
log.Print("leader election: waiting for routine")
wg.Wait()
log.Print("leader election: routine exited")
return
}

5
modd.conf Normal file
View File

@ -0,0 +1,5 @@
modd.conf {}
go.* **/*.go {
prep: go test ./...
}

13
set.go Normal file
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@ -0,0 +1,13 @@
package etcdb
import (
"context"
)
type SetSpec[T any] struct {
Spec Spec
}
func (p SetSpec[T]) In(ctx context.Context) TypedDB[T] {
return TypedDB[T]{p.Spec.In(ctx), JSONCodec}
}

27
single.go Normal file
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@ -0,0 +1,27 @@
package etcdb
import (
"context"
)
type SingletonSpec[T any] struct {
Spec Spec
Key string
}
func (p SingletonSpec[T]) In(ctx context.Context) Singleton[T] {
return Singleton[T]{TypedDB[T]{p.Spec.In(ctx), JSONCodec}, p.Key}
}
type Singleton[T any] struct {
db TypedDB[T]
key string
}
func (s Singleton[T]) Get() (v T, ok bool, err error) {
return s.db.Get(s.key)
}
func (s Singleton[T]) Set(value T) error {
return s.db.Put(s.key, value)
}