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account.go
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account.go
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// Copyright 2017 Monax Industries Limited
//
// 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 acm
import (
"encoding/json"
"fmt"
"github.com/hyperledger/burrow/binary"
"github.com/hyperledger/burrow/crypto"
"github.com/hyperledger/burrow/event/query"
"github.com/hyperledger/burrow/permission"
"github.com/tendermint/go-amino"
)
var GlobalPermissionsAddress = crypto.Address(binary.Zero160)
// The default immutable interface to an account
type Account interface {
crypto.Addressable
// The value held by this account in terms of the chain-native token
Balance() uint64
// The EVM byte code held by this account (or equivalently, this contract)
Code() Bytecode
// The sequence number of this account, incremented each time a mutation of the
// Account is persisted to the blockchain state
Sequence() uint64
// The permission flags and roles for this account
Permissions() permission.AccountPermissions
// Obtain a deterministic serialisation of this account
// (i.e. update order and Go runtime independent)
Encode() ([]byte, error)
// String representation of the account
String() string
// Get tags for this account
Tagged() query.Tagged
}
// MutableAccount structure
type MutableAccount struct {
concreteAccount *ConcreteAccount
}
func NewConcreteAccount(pubKey crypto.PublicKey) *ConcreteAccount {
return &ConcreteAccount{
Address: pubKey.Address(),
PublicKey: pubKey,
}
}
func NewConcreteAccountFromSecret(secret string) *ConcreteAccount {
return NewConcreteAccount(crypto.PrivateKeyFromSecret(secret, crypto.CurveTypeEd25519).GetPublicKey())
}
func (ca ConcreteAccount) Account() Account {
return ca.MutableAccount()
}
// Wrap a copy of ConcreteAccount in a MutableAccount
func (ca ConcreteAccount) MutableAccount() *MutableAccount {
return &MutableAccount{
concreteAccount: &ca,
}
}
func (ca ConcreteAccount) Encode() ([]byte, error) {
return cdc.MarshalBinary(ca)
}
func DecodeConcrete(accBytes []byte) (*ConcreteAccount, error) {
ca := new(ConcreteAccount)
err := cdc.UnmarshalBinary(accBytes, ca)
if err != nil {
return nil, err
}
return ca, nil
}
// Conversions
//
// Using the naming convention is this package of 'As<Type>' being
// a conversion from Account to <Type> and 'From<Type>' being conversion
// from <Type> to Account. Conversions are done by copying
// Returns a mutable, serialisable ConcreteAccount by copying from account
func AsConcreteAccount(account Account) *ConcreteAccount {
if account == nil {
return nil
}
return &ConcreteAccount{
Address: account.Address(),
PublicKey: account.PublicKey(),
Balance: account.Balance(),
Code: account.Code(),
Sequence: account.Sequence(),
Permissions: account.Permissions(),
}
}
// Creates an otherwise zeroed Account from an Addressable and returns it as MutableAccount
func FromAddressable(addressable crypto.Addressable) *MutableAccount {
ca := &ConcreteAccount{
Address: addressable.Address(),
PublicKey: addressable.PublicKey(),
// Since nil slices and maps compare differently to empty ones
Code: Bytecode{},
Permissions: permission.AccountPermissions{
Roles: []string{},
},
}
return ca.MutableAccount()
}
// Returns a MutableAccount by copying from account
func AsMutableAccount(account Account) *MutableAccount {
if account == nil {
return nil
}
return AsConcreteAccount(account).MutableAccount()
}
var _ Account = &MutableAccount{}
func (acc ConcreteAccount) String() string {
return fmt.Sprintf("ConcreteAccount{Address: %s; Sequence: %v; PublicKey: %v Balance: %v; CodeLength: %v; Permissions: %s}",
acc.Address, acc.Sequence, acc.PublicKey, acc.Balance, len(acc.Code), acc.Permissions)
}
///---- Getter methods
func (acc MutableAccount) Address() crypto.Address { return acc.concreteAccount.Address }
func (acc MutableAccount) PublicKey() crypto.PublicKey { return acc.concreteAccount.PublicKey }
func (acc MutableAccount) Balance() uint64 { return acc.concreteAccount.Balance }
func (acc MutableAccount) Code() Bytecode { return acc.concreteAccount.Code }
func (acc MutableAccount) Sequence() uint64 { return acc.concreteAccount.Sequence }
func (acc MutableAccount) Permissions() permission.AccountPermissions {
return acc.concreteAccount.Permissions
}
///---- Mutable methods
// Set public key (needed for lazy initialisation), should also set the dependent address
func (acc *MutableAccount) SetPublicKey(publicKey crypto.PublicKey) {
acc.concreteAccount.PublicKey = publicKey
}
func (acc *MutableAccount) SubtractFromBalance(amount uint64) error {
if amount > acc.Balance() {
return fmt.Errorf("insufficient funds: attempt to subtract %v from the balance of %s",
amount, acc.Address())
}
acc.concreteAccount.Balance -= amount
return nil
}
func (acc *MutableAccount) AddToBalance(amount uint64) error {
if binary.IsUint64SumOverflow(acc.Balance(), amount) {
return fmt.Errorf("uint64 overflow: attempt to add %v to the balance of %s",
amount, acc.Address())
}
acc.concreteAccount.Balance += amount
return nil
}
func (acc *MutableAccount) SetBalance(amount uint64) error {
acc.concreteAccount.Balance = amount
return nil
}
func (acc *MutableAccount) SetCode(code []byte) error {
acc.concreteAccount.Code = code
return nil
}
func (acc *MutableAccount) IncSequence() {
acc.concreteAccount.Sequence++
}
func (acc *MutableAccount) SetPermissions(accPerms permission.AccountPermissions) error {
if !accPerms.Base.Perms.IsValid() {
return fmt.Errorf("attempt to set invalid perm 0%b on account %v", accPerms.Base.Perms, acc)
}
acc.concreteAccount.Permissions = accPerms
return nil
}
func (acc *MutableAccount) MutablePermissions() *permission.AccountPermissions {
return &acc.concreteAccount.Permissions
}
type TaggedAccount struct {
*MutableAccount
query.Tagged
}
func (acc *MutableAccount) Tagged() query.Tagged {
return &TaggedAccount{
MutableAccount: acc,
Tagged: query.MustReflectTags(acc),
}
}
///---- Serialisation methods
var cdc = amino.NewCodec()
func (acc MutableAccount) Encode() ([]byte, error) {
return acc.concreteAccount.Encode()
}
func Decode(accBytes []byte) (*MutableAccount, error) {
ca, err := DecodeConcrete(accBytes)
if err != nil {
return nil, err
}
return &MutableAccount{
concreteAccount: ca,
}, nil
}
func (acc MutableAccount) MarshalJSON() ([]byte, error) {
return json.Marshal(acc.concreteAccount)
}
func (acc *MutableAccount) UnmarshalJSON(bytes []byte) error {
err := json.Unmarshal(bytes, &acc.concreteAccount)
if err != nil {
return err
}
return nil
}
func (acc MutableAccount) String() string {
return fmt.Sprintf("MutableAccount{%s}", acc.concreteAccount.String())
}