From 193f302e28df3af24742677ec12d12f0db51478a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mika=C3=ABl=20Cluseau?= Date: Mon, 5 Dec 2022 10:26:49 +0100 Subject: [PATCH] initial commit --- client.go | 122 +++++++++++++++ codec.go | 23 +++ e2e/e2e.go | 73 +++++++++ encrypted-set.go | 387 +++++++++++++++++++++++++++++++++++++++++++++++ etcd-spec.go | 171 +++++++++++++++++++++ etcdb.go | 186 +++++++++++++++++++++++ go.mod | 26 ++++ go.sum | 283 ++++++++++++++++++++++++++++++++++ hex-db.go | 91 +++++++++++ leader/leader.go | 123 +++++++++++++++ modd.conf | 5 + set.go | 13 ++ single.go | 27 ++++ 13 files changed, 1530 insertions(+) create mode 100644 client.go create mode 100644 codec.go create mode 100644 e2e/e2e.go create mode 100644 encrypted-set.go create mode 100644 etcd-spec.go create mode 100644 etcdb.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 hex-db.go create mode 100644 leader/leader.go create mode 100644 modd.conf create mode 100644 set.go create mode 100644 single.go diff --git a/client.go b/client.go new file mode 100644 index 0000000..ad9a17b --- /dev/null +++ b/client.go @@ -0,0 +1,122 @@ +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) +} diff --git a/codec.go b/codec.go new file mode 100644 index 0000000..3bdb22f --- /dev/null +++ b/codec.go @@ -0,0 +1,23 @@ +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) +} diff --git a/e2e/e2e.go b/e2e/e2e.go new file mode 100644 index 0000000..ff306da --- /dev/null +++ b/e2e/e2e.go @@ -0,0 +1,73 @@ +package main + +import ( + "context" + "flag" + "log" + + "novit.tech/direktil/etcdb" + "novit.tech/direktil/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") +} diff --git a/encrypted-set.go b/encrypted-set.go new file mode 100644 index 0000000..54e7089 --- /dev/null +++ b/encrypted-set.go @@ -0,0 +1,387 @@ +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 + } +} diff --git a/etcd-spec.go b/etcd-spec.go new file mode 100644 index 0000000..b615955 --- /dev/null +++ b/etcd-spec.go @@ -0,0 +1,171 @@ +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 +} diff --git a/etcdb.go b/etcdb.go new file mode 100644 index 0000000..9a09cc4 --- /dev/null +++ b/etcdb.go @@ -0,0 +1,186 @@ +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 +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..acbaaed --- /dev/null +++ b/go.mod @@ -0,0 +1,26 @@ +module novit.tech/direktil/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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..0d12956 --- /dev/null +++ b/go.sum @@ -0,0 +1,283 @@ 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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= diff --git a/hex-db.go b/hex-db.go new file mode 100644 index 0000000..70f4a4b --- /dev/null +++ b/hex-db.go @@ -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 +} diff --git a/leader/leader.go b/leader/leader.go new file mode 100644 index 0000000..e6aa12f --- /dev/null +++ b/leader/leader.go @@ -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/direktil/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 +} diff --git a/modd.conf b/modd.conf new file mode 100644 index 0000000..f46acd6 --- /dev/null +++ b/modd.conf @@ -0,0 +1,5 @@ +modd.conf {} + +go.* **/*.go { + prep: go test ./... +} diff --git a/set.go b/set.go new file mode 100644 index 0000000..8006377 --- /dev/null +++ b/set.go @@ -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} +} diff --git a/single.go b/single.go new file mode 100644 index 0000000..bd1c592 --- /dev/null +++ b/single.go @@ -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) +}