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db.go
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db.go
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package main
import (
"bytes"
"context"
"encoding/gob"
"encoding/pem"
"fmt"
"time"
"github.com/dgraph-io/badger"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes"
"github.com/golang/protobuf/ptypes/any"
"github.com/google/trillian"
"github.com/google/trillian/crypto/keyspb"
spb "github.com/google/trillian/crypto/sigpb"
_ "github.com/google/trillian/merkle/rfc6962"
)
const OurPublicKey = `-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEmTz0jNtdPnob3U8uylM5PORUJPw2
9VEU8V68V8FtlxFxuuU6MFHzN5/3XnWCeJ0xJ1Uabk1r/eS0H7aWOksMNA==
-----END PUBLIC KEY-----`
const OurPrivateKey = `-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgaK0u/I9YXTE7Yxb6
uGK3vX/KzWQVqCpqctv4hhAWEcuhRANCAASZPPSM210+ehvdTy7KUzk85FQk/Db1
URTxXrxXwW2XEXG65TowUfM3n/dedYJ4nTEnVRpuTWv95LQftpY6Sww0
-----END PRIVATE KEY-----`
func mustMarshalAny(pb proto.Message) *any.Any {
value, err := ptypes.MarshalAny(pb)
if err != nil {
panic(err)
}
return value
}
func (a *adt) initmap() int64 {
ctx := context.Background()
pubk, _ := pem.Decode([]byte(OurPublicKey))
privk, _ := pem.Decode([]byte(OurPrivateKey))
var err error
MapTree := &trillian.Tree{
TreeState: trillian.TreeState_ACTIVE,
TreeType: trillian.TreeType_MAP,
HashStrategy: trillian.HashStrategy_TEST_MAP_HASHER,
HashAlgorithm: spb.DigitallySigned_SHA256,
SignatureAlgorithm: spb.DigitallySigned_ECDSA,
DisplayName: "WAVE Storage map",
Description: "Storage of attestations and entities for WAVE",
PrivateKey: mustMarshalAny(&keyspb.PrivateKey{
Der: privk.Bytes,
}),
PublicKey: &keyspb.PublicKey{
Der: pubk.Bytes,
},
MaxRootDuration: ptypes.DurationProto(0 * time.Millisecond),
}
respct, err := a.adminClient.CreateTree(ctx, &trillian.CreateTreeRequest{
Tree: MapTree,
})
if err != nil {
panic(err)
}
_, err = a.mapClient.InitMap(ctx, &trillian.InitMapRequest{
MapId: respct.TreeId,
})
if err != nil {
panic(err)
}
return respct.TreeId
}
func (a *adt) LoadStateFromDB() {
err := a.db.View(func(txn *badger.Txn) error {
item, err := txn.Get([]byte("state"))
var st *state
if err == badger.ErrKeyNotFound {
st = a.defaultstate()
} else {
val, err := item.Value()
if err != nil {
return err
}
st = &state{}
buf := bytes.NewBuffer(val)
err = gob.NewDecoder(buf).Decode(st)
if err != nil {
return err
}
}
a.state = st
return nil
})
if err != nil {
panic(err)
}
}
func (a *adt) haveWeVerified(roothash []byte) bool {
found := false
err := a.db.View(func(txn *badger.Txn) error {
hash := []byte(fmt.Sprintf("verifiedroots/%x", roothash))
_, err := txn.Get(hash)
if err == nil {
found = true
} else if err != badger.ErrKeyNotFound {
return err
}
return nil
})
if err != nil {
panic(err)
}
return found
}
func (a *adt) storeVerified(roothash []byte) {
err := a.db.Update(func(txn *badger.Txn) error {
hash := []byte(fmt.Sprintf("verifiedroots/%x", roothash))
return txn.Set(hash, []byte("1"))
})
if err != nil {
panic(err)
}
}
func (a *adt) defaultstate() *state {
treeid := a.initmap()
return &state{
MapTreeId: treeid,
OpLogIndex: 0,
RootLogIndex: -1,
}
}
func (a *adt) SaveStateToDB() {
buf := bytes.Buffer{}
err := gob.NewEncoder(&buf).Encode(a.state)
if err != nil {
panic(err)
}
err = a.db.Update(func(txn *badger.Txn) error {
return txn.Set([]byte("state"), buf.Bytes())
})
if err != nil {
panic(err)
}
}