singlet_address_code.go

// Copyright 2021 dfuse Platform Inc.
//
// 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 statedb

import (
	"fmt"

	pbstatedb "github.com/streamingfast/evmx/pb/sf/ethereum/statedb/v1"
	"github.com/streamingfast/fluxdb"
	"google.golang.org/protobuf/proto"
)

const CodeCollectionID = 0xA003
const CodeCollectionName = "code"

func init() {
	fluxdb.RegisterSingletFactory(CodeCollectionID, CodeCollectionName, func(identifier []byte) (fluxdb.Singlet, error) {
		if len(identifier) < addressByteCount {
			return nil, fluxdb.ErrInvalidKeyLengthAtLeast("account code identifier", addressByteCount, len(identifier))
		}

		return AddressCodeSinglet(identifier[0:addressByteCount]), nil
	})
}

type AddressCodeSinglet []byte

func NewAddressCodeSinglet(address []byte) (AddressCodeSinglet, error) {
	if len(address) < addressByteCount {
		return nil, fluxdb.ErrInvalidKeyLengthAtLeast("account code identifier", addressByteCount, len(address))
	}

	return AddressCodeSinglet(address), nil
}

func (s AddressCodeSinglet) Collection() uint16 {
	return CodeCollectionID
}

func (s AddressCodeSinglet) Identifier() []byte {
	return []byte(s)
}

func (s AddressCodeSinglet) Entry(height uint64, data []byte) (fluxdb.SingletEntry, error) {
	return &AddressCodeEntry{baseEntry(s, height, data)}, nil
}

func (s AddressCodeSinglet) Address() []byte {
	return []byte(s)
}

func (s AddressCodeSinglet) String() string {
	return CodeCollectionName + ":" + bytesToHex(s)
}

type AddressCodeEntry struct {
	fluxdb.BaseSingletEntry
}

func NewAddressCodeEntry(blockNum uint64, address []byte, payload []byte) (entry *AddressCodeEntry, err error) {
	pb := pbstatedb.CodeValue{Payload: payload}
	value, err := proto.Marshal(&pb)
	if err != nil {
		return nil, fmt.Errorf("marshal proto: %w", err)
	}

	singlet, err := NewAddressCodeSinglet(address)
	if err != nil {
		return nil, fmt.Errorf("invalid entry: %w", err)
	}

	return &AddressCodeEntry{baseEntry(singlet, blockNum, value)}, nil
}

func (r *AddressCodeEntry) Address() []byte {
	return r.Singlet().(AddressCodeSinglet).Address()
}

func (r *AddressCodeEntry) Code() ([]byte, error) {
	pb := &pbstatedb.CodeValue{}
	if err := proto.Unmarshal(r.Value(), pb); err != nil {
		return nil, err
	}

	return pb.Payload, nil
}