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beefy.go
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beefy.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
// Copyright 2021 Snowfork
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"github.com/centrifuge/go-substrate-rpc-client/v4/scale"
"github.com/centrifuge/go-substrate-rpc-client/v4/types/codec"
)
// PayloadItem ...
type PayloadItem struct {
ID [2]byte
Data []byte
}
// Commitment is a beefy commitment
type Commitment struct {
Payload []PayloadItem
BlockNumber uint32
ValidatorSetID uint64
}
// SignedCommitment is a beefy commitment with optional signatures from the set of validators
type SignedCommitment struct {
Commitment Commitment
Signatures []OptionBeefySignature
}
type OptionalSignedCommitment struct {
option
value SignedCommitment
}
type CompactSignedCommitment struct {
Commitment Commitment
SignaturesFrom []byte
ValidatorSetLen uint32
SignaturesCompact []BeefySignature
}
// BeefySignature is a beefy signature
type BeefySignature [65]byte
// OptionBeefySignature is a structure that can store a BeefySignature or a missing value
type OptionBeefySignature struct {
option
value BeefySignature
}
// NewOptionBeefySignature creates an OptionBeefySignature with a value
func NewOptionBeefySignature(value BeefySignature) OptionBeefySignature {
return OptionBeefySignature{option{true}, value}
}
// NewOptionBeefySignatureEmpty creates an OptionBeefySignature without a value
func NewOptionBeefySignatureEmpty() OptionBeefySignature {
return OptionBeefySignature{option: option{false}}
}
func (o OptionBeefySignature) Encode(encoder scale.Encoder) error {
return encoder.EncodeOption(o.hasValue, o.value)
}
func (o *OptionBeefySignature) Decode(decoder scale.Decoder) error {
return decoder.DecodeOption(&o.hasValue, &o.value)
}
// SetSome sets a value
func (o *OptionBeefySignature) SetSome(value BeefySignature) {
o.hasValue = true
o.value = value
}
// SetNone removes a value and marks it as missing
func (o *OptionBeefySignature) SetNone() {
o.hasValue = false
o.value = BeefySignature{}
}
// Unwrap returns a flag that indicates whether a value is present and the stored value
func (o OptionBeefySignature) Unwrap() (ok bool, value BeefySignature) {
return o.hasValue, o.value
}
// bits are packed into chunks of this size
const containerBitSize = 8
func (s *SignedCommitment) Decode(decoder scale.Decoder) error {
compact := CompactSignedCommitment{}
err := decoder.Decode(&compact)
if err != nil {
return err
}
var bits []byte
for _, block := range compact.SignaturesFrom {
for bit := 0; bit < containerBitSize; bit++ {
bits = append(bits, (block>>(containerBitSize-bit-1))&1)
}
}
bits = bits[0:compact.ValidatorSetLen]
var signatures []OptionBeefySignature
sigIndex := 0
for _, bit := range bits {
if bit == 1 {
signatures = append(signatures, NewOptionBeefySignature(compact.SignaturesCompact[sigIndex]))
sigIndex++
} else {
signatures = append(signatures, NewOptionBeefySignatureEmpty())
}
}
s.Commitment = compact.Commitment
s.Signatures = signatures
return nil
}
func (s SignedCommitment) Encode(encoder scale.Encoder) error {
var compact CompactSignedCommitment
var bits []byte
var signaturesFrom []byte
var signaturesCompact []BeefySignature
validatorSetLen := len(s.Signatures)
for _, optionSig := range s.Signatures {
if optionSig.IsSome() {
bits = append(bits, 1)
_, signature := optionSig.Unwrap()
signaturesCompact = append(signaturesCompact, signature)
} else {
bits = append(bits, 0)
}
}
excessBitsLen := containerBitSize - (validatorSetLen % containerBitSize)
bits = append(bits, make([]byte, excessBitsLen)...)
for _, chunk := range makeChunks(bits, containerBitSize) {
acc := chunk[0]
for i := 1; i < containerBitSize; i++ {
acc <<= 1
acc |= chunk[i]
}
signaturesFrom = append(signaturesFrom, acc)
}
compact.Commitment = s.Commitment
compact.SignaturesCompact = signaturesCompact
compact.SignaturesFrom = signaturesFrom
compact.ValidatorSetLen = uint32(validatorSetLen)
return encoder.Encode(compact)
}
func makeChunks(slice []byte, chunkSize int) [][]byte {
var chunks [][]byte
for i := 0; i < len(slice); i += chunkSize {
end := i + chunkSize
// necessary check to avoid slicing beyond
// slice capacity
if end > len(slice) {
end = len(slice)
}
chunks = append(chunks, slice[i:end])
}
return chunks
}
// UnmarshalText deserializes hex string into a SignedCommitment.
// Used for decoding JSON-RPC subscription messages (beefy_subscribeJustifications)
func (s *SignedCommitment) UnmarshalText(text []byte) error {
return codec.DecodeFromHex(string(text), s)
}
func (o OptionalSignedCommitment) Encode(encoder scale.Encoder) error {
return encoder.EncodeOption(o.hasValue, o.value)
}
func (o *OptionalSignedCommitment) Decode(decoder scale.Decoder) error {
return decoder.DecodeOption(&o.hasValue, &o.value)
}
func (o OptionalSignedCommitment) Unwrap() (ok bool, value SignedCommitment) {
return o.hasValue, o.value
}
func (o *OptionalSignedCommitment) SetSome(value SignedCommitment) {
o.hasValue = true
o.value = value
}
func (o *OptionalSignedCommitment) SetNone() {
o.hasValue = false
o.value = SignedCommitment{}
}