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-rw-r--r--accounts/abi/bind/backend.go95
-rw-r--r--accounts/abi/bind/backends/simulated.go162
-rw-r--r--accounts/abi/bind/base.go75
3 files changed, 157 insertions, 175 deletions
diff --git a/accounts/abi/bind/backend.go b/accounts/abi/bind/backend.go
index bec742c29..3d38f87cd 100644
--- a/accounts/abi/bind/backend.go
+++ b/accounts/abi/bind/backend.go
@@ -20,28 +20,42 @@ import (
"errors"
"math/big"
+ "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"golang.org/x/net/context"
)
-// ErrNoCode is returned by call and transact operations for which the requested
-// recipient contract to operate on does not exist in the state db or does not
-// have any code associated with it (i.e. suicided).
-var ErrNoCode = errors.New("no contract code at given address")
+var (
+ // ErrNoCode is returned by call and transact operations for which the requested
+ // recipient contract to operate on does not exist in the state db or does not
+ // have any code associated with it (i.e. suicided).
+ ErrNoCode = errors.New("no contract code at given address")
+
+ // This error is raised when attempting to perform a pending state action
+ // on a backend that doesn't implement PendingContractCaller.
+ ErrNoPendingState = errors.New("backend does not support pending state")
+)
// ContractCaller defines the methods needed to allow operating with contract on a read
// only basis.
type ContractCaller interface {
- // HasCode checks if the contract at the given address has any code associated
- // with it or not. This is needed to differentiate between contract internal
- // errors and the local chain being out of sync.
- HasCode(ctx context.Context, contract common.Address, pending bool) (bool, error)
+ // CodeAt returns the code of the given account. This is needed to differentiate
+ // between contract internal errors and the local chain being out of sync.
+ CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error)
+ // ContractCall executes an Ethereum contract call with the specified data as the
+ // input.
+ CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)
+}
- // ContractCall executes an Ethereum contract call with the specified data as
- // the input. The pending flag requests execution against the pending block, not
- // the stable head of the chain.
- ContractCall(ctx context.Context, contract common.Address, data []byte, pending bool) ([]byte, error)
+// PendingContractCaller defines methods to perform contract calls on the pending state.
+// Call will try to discover this interface when access to the pending state is requested.
+// If the backend does not support the pending state, Call returns ErrNoPendingState.
+type PendingContractCaller interface {
+ // PendingCodeAt returns the code of the given account in the pending state.
+ PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error)
+ // PendingCallContract executes an Ethereum contract call against the pending state.
+ PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error)
}
// ContractTransactor defines the methods needed to allow operating with contract
@@ -49,64 +63,25 @@ type ContractCaller interface {
// used when the user does not provide some needed values, but rather leaves it up
// to the transactor to decide.
type ContractTransactor interface {
- // PendingAccountNonce retrieves the current pending nonce associated with an
- // account.
- PendingAccountNonce(ctx context.Context, account common.Address) (uint64, error)
-
+ // PendingCodeAt returns the code of the given account in the pending state.
+ PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)
+ // PendingNonceAt retrieves the current pending nonce associated with an account.
+ PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
// execution of a transaction.
SuggestGasPrice(ctx context.Context) (*big.Int, error)
-
- // HasCode checks if the contract at the given address has any code associated
- // with it or not. This is needed to differentiate between contract internal
- // errors and the local chain being out of sync.
- HasCode(ctx context.Context, contract common.Address, pending bool) (bool, error)
-
- // EstimateGasLimit tries to estimate the gas needed to execute a specific
+ // EstimateGas tries to estimate the gas needed to execute a specific
// transaction based on the current pending state of the backend blockchain.
// There is no guarantee that this is the true gas limit requirement as other
// transactions may be added or removed by miners, but it should provide a basis
// for setting a reasonable default.
- EstimateGasLimit(ctx context.Context, sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error)
-
+ EstimateGas(ctx context.Context, call ethereum.CallMsg) (usedGas *big.Int, err error)
// SendTransaction injects the transaction into the pending pool for execution.
SendTransaction(ctx context.Context, tx *types.Transaction) error
}
-// ContractBackend defines the methods needed to allow operating with contract
-// on a read-write basis.
-//
-// This interface is essentially the union of ContractCaller and ContractTransactor
-// but due to a bug in the Go compiler (https://github.com/golang/go/issues/6977),
-// we cannot simply list it as the two interfaces. The other solution is to add a
-// third interface containing the common methods, but that convolutes the user API
-// as it introduces yet another parameter to require for initialization.
+// ContractBackend defines the methods needed to work with contracts on a read-write basis.
type ContractBackend interface {
- // HasCode checks if the contract at the given address has any code associated
- // with it or not. This is needed to differentiate between contract internal
- // errors and the local chain being out of sync.
- HasCode(ctx context.Context, contract common.Address, pending bool) (bool, error)
-
- // ContractCall executes an Ethereum contract call with the specified data as
- // the input. The pending flag requests execution against the pending block, not
- // the stable head of the chain.
- ContractCall(ctx context.Context, contract common.Address, data []byte, pending bool) ([]byte, error)
-
- // PendingAccountNonce retrieves the current pending nonce associated with an
- // account.
- PendingAccountNonce(ctx context.Context, account common.Address) (uint64, error)
-
- // SuggestGasPrice retrieves the currently suggested gas price to allow a timely
- // execution of a transaction.
- SuggestGasPrice(ctx context.Context) (*big.Int, error)
-
- // EstimateGasLimit tries to estimate the gas needed to execute a specific
- // transaction based on the current pending state of the backend blockchain.
- // There is no guarantee that this is the true gas limit requirement as other
- // transactions may be added or removed by miners, but it should provide a basis
- // for setting a reasonable default.
- EstimateGasLimit(ctx context.Context, sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error)
-
- // SendTransaction injects the transaction into the pending pool for execution.
- SendTransaction(ctx context.Context, tx *types.Transaction) error
+ ContractCaller
+ ContractTransactor
}
diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 687a31bf1..c2542f40e 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -17,8 +17,10 @@
package backends
import (
+ "fmt"
"math/big"
+ "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
@@ -79,58 +81,44 @@ func (b *SimulatedBackend) Rollback() {
b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database)
}
-// HasCode implements ContractVerifier.HasCode, checking whether there is any
-// code associated with a certain account in the blockchain.
-func (b *SimulatedBackend) HasCode(ctx context.Context, contract common.Address, pending bool) (bool, error) {
- if pending {
- return len(b.pendingState.GetCode(contract)) > 0, nil
+// CodeAt implements ChainStateReader.CodeAt, returning the code associated with
+// a certain account at a given block number in the blockchain.
+func (b *SimulatedBackend) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) {
+ if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
+ return nil, fmt.Errorf("SimulatedBackend cannot access blocks other than the latest block")
}
statedb, _ := b.blockchain.State()
- return len(statedb.GetCode(contract)) > 0, nil
+ return statedb.GetCode(contract), nil
}
-// ContractCall implements ContractCaller.ContractCall, executing the specified
-// contract with the given input data.
-func (b *SimulatedBackend) ContractCall(ctx context.Context, contract common.Address, data []byte, pending bool) ([]byte, error) {
- // Create a copy of the current state db to screw around with
- var (
- block *types.Block
- statedb *state.StateDB
- )
- if pending {
- block, statedb = b.pendingBlock, b.pendingState.Copy()
- } else {
- block = b.blockchain.CurrentBlock()
- statedb, _ = b.blockchain.State()
- }
- // If there's no code to interact with, respond with an appropriate error
- if code := statedb.GetCode(contract); len(code) == 0 {
- return nil, bind.ErrNoCode
- }
- // Set infinite balance to the a fake caller account
- from := statedb.GetOrNewStateObject(common.Address{})
- from.SetBalance(common.MaxBig)
+// PendingCodeAt implements PendingStateReader.PendingCodeAt, returning the
+// code associated with a certain account in the pending state of the blockchain.
+func (b *SimulatedBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
+ return b.pendingState.GetCode(contract), nil
+}
- // Assemble the call invocation to measure the gas usage
- msg := callmsg{
- from: from,
- to: &contract,
- gasPrice: new(big.Int),
- gasLimit: common.MaxBig,
- value: new(big.Int),
- data: data,
+// CallContract executes a contract call.
+func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) {
+ if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
+ return nil, fmt.Errorf("SimulatedBackend cannot access blocks other than the latest block")
}
- // Execute the call and return
- vmenv := core.NewEnv(statedb, chainConfig, b.blockchain, msg, block.Header(), vm.Config{})
- gaspool := new(core.GasPool).AddGas(common.MaxBig)
+ state, err := b.blockchain.State()
+ if err != nil {
+ return nil, err
+ }
+ rval, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
+ return rval, err
+}
- out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
- return out, err
+// PendingCallContract executes a contract call on the pending state.
+func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) {
+ rval, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState.Copy())
+ return rval, err
}
-// PendingAccountNonce implements ContractTransactor.PendingAccountNonce, retrieving
+// PendingNonceAt implements PendingStateReader.PendingNonceAt, retrieving
// the nonce currently pending for the account.
-func (b *SimulatedBackend) PendingAccountNonce(ctx context.Context, account common.Address) (uint64, error) {
+func (b *SimulatedBackend) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
return b.pendingState.GetOrNewStateObject(account).Nonce(), nil
}
@@ -140,45 +128,49 @@ func (b *SimulatedBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error
return big.NewInt(1), nil
}
-// EstimateGasLimit implements ContractTransactor.EstimateGasLimit, executing the
-// requested code against the currently pending block/state and returning the used
-// gas.
-func (b *SimulatedBackend) EstimateGasLimit(ctx context.Context, sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
- // Create a copy of the currently pending state db to screw around with
- var (
- block = b.pendingBlock
- statedb = b.pendingState.Copy()
- )
- // If there's no code to interact with, respond with an appropriate error
- if contract != nil {
- if code := statedb.GetCode(*contract); len(code) == 0 {
- return nil, bind.ErrNoCode
- }
- }
- // Set infinite balance to the a fake caller account
- from := statedb.GetOrNewStateObject(sender)
- from.SetBalance(common.MaxBig)
+// EstimateGas executes the requested code against the currently pending block/state and
+// returns the used amount of gas.
+func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMsg) (*big.Int, error) {
+ _, gas, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState.Copy())
+ return gas, err
+}
- // Assemble the call invocation to measure the gas usage
- msg := callmsg{
- from: from,
- to: contract,
- gasPrice: new(big.Int),
- gasLimit: common.MaxBig,
- value: value,
- data: data,
+// callContract implemens common code between normal and pending contract calls.
+// state is modified during execution, make sure to copy it if necessary.
+func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, *big.Int, error) {
+ // Ensure message is initialized properly.
+ if call.GasPrice == nil {
+ call.GasPrice = big.NewInt(1)
+ }
+ if call.Gas == nil || call.Gas.BitLen() == 0 {
+ call.Gas = big.NewInt(50000000)
}
- // Execute the call and return
+ if call.Value == nil {
+ call.Value = new(big.Int)
+ }
+ // Set infinite balance to the fake caller account.
+ from := statedb.GetOrNewStateObject(call.From)
+ from.SetBalance(common.MaxBig)
+ // Execute the call.
+ msg := callmsg{call}
vmenv := core.NewEnv(statedb, chainConfig, b.blockchain, msg, block.Header(), vm.Config{})
gaspool := new(core.GasPool).AddGas(common.MaxBig)
-
- _, gas, _, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
- return gas, err
+ ret, gasUsed, _, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
+ return ret, gasUsed, err
}
-// SendTransaction implements ContractTransactor.SendTransaction, delegating the raw
-// transaction injection to the remote node.
+// SendTransaction updates the pending block to include the given transaction.
+// It panics if the transaction is invalid.
func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transaction) error {
+ sender, err := tx.From()
+ if err != nil {
+ panic(fmt.Errorf("invalid transaction: %v", err))
+ }
+ nonce := b.pendingState.GetNonce(sender)
+ if tx.Nonce() != nonce {
+ panic(fmt.Errorf("invalid transaction nonce: got %d, want %d", tx.Nonce(), nonce))
+ }
+
blocks, _ := core.GenerateChain(nil, b.blockchain.CurrentBlock(), b.database, 1, func(number int, block *core.BlockGen) {
for _, tx := range b.pendingBlock.Transactions() {
block.AddTx(tx)
@@ -187,26 +179,20 @@ func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transa
})
b.pendingBlock = blocks[0]
b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database)
-
return nil
}
// callmsg implements core.Message to allow passing it as a transaction simulator.
type callmsg struct {
- from *state.StateObject
- to *common.Address
- gasLimit *big.Int
- gasPrice *big.Int
- value *big.Int
- data []byte
+ ethereum.CallMsg
}
-func (m callmsg) From() (common.Address, error) { return m.from.Address(), nil }
-func (m callmsg) FromFrontier() (common.Address, error) { return m.from.Address(), nil }
+func (m callmsg) From() (common.Address, error) { return m.CallMsg.From, nil }
+func (m callmsg) FromFrontier() (common.Address, error) { return m.CallMsg.From, nil }
func (m callmsg) Nonce() uint64 { return 0 }
func (m callmsg) CheckNonce() bool { return false }
-func (m callmsg) To() *common.Address { return m.to }
-func (m callmsg) GasPrice() *big.Int { return m.gasPrice }
-func (m callmsg) Gas() *big.Int { return m.gasLimit }
-func (m callmsg) Value() *big.Int { return m.value }
-func (m callmsg) Data() []byte { return m.data }
+func (m callmsg) To() *common.Address { return m.CallMsg.To }
+func (m callmsg) GasPrice() *big.Int { return m.CallMsg.GasPrice }
+func (m callmsg) Gas() *big.Int { return m.CallMsg.Gas }
+func (m callmsg) Value() *big.Int { return m.CallMsg.Value }
+func (m callmsg) Data() []byte { return m.CallMsg.Data }
diff --git a/accounts/abi/bind/base.go b/accounts/abi/bind/base.go
index 80948d3f1..965f51e85 100644
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@@ -20,8 +20,8 @@ import (
"errors"
"fmt"
"math/big"
- "sync/atomic"
+ "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
@@ -62,9 +62,6 @@ type BoundContract struct {
abi abi.ABI // Reflect based ABI to access the correct Ethereum methods
caller ContractCaller // Read interface to interact with the blockchain
transactor ContractTransactor // Write interface to interact with the blockchain
-
- latestHasCode uint32 // Cached verification that the latest state contains code for this contract
- pendingHasCode uint32 // Cached verification that the pending state contains code for this contract
}
// NewBoundContract creates a low level contract interface through which calls
@@ -105,25 +102,42 @@ func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string,
if opts == nil {
opts = new(CallOpts)
}
- // Make sure we have a contract to operate on, and bail out otherwise
- if (opts.Pending && atomic.LoadUint32(&c.pendingHasCode) == 0) || (!opts.Pending && atomic.LoadUint32(&c.latestHasCode) == 0) {
- if code, err := c.caller.HasCode(opts.Context, c.address, opts.Pending); err != nil {
- return err
- } else if !code {
- return ErrNoCode
- }
- if opts.Pending {
- atomic.StoreUint32(&c.pendingHasCode, 1)
- } else {
- atomic.StoreUint32(&c.latestHasCode, 1)
- }
- }
// Pack the input, call and unpack the results
input, err := c.abi.Pack(method, params...)
if err != nil {
return err
}
- output, err := c.caller.ContractCall(opts.Context, c.address, input, opts.Pending)
+ var (
+ msg = ethereum.CallMsg{To: &c.address, Data: input}
+ ctx = ensureContext(opts.Context)
+ code []byte
+ output []byte
+ )
+ if opts.Pending {
+ pb, ok := c.caller.(PendingContractCaller)
+ if !ok {
+ return ErrNoPendingState
+ }
+ output, err = pb.PendingCallContract(ctx, msg)
+ if err == nil && len(output) == 0 {
+ // Make sure we have a contract to operate on, and bail out otherwise.
+ if code, err = pb.PendingCodeAt(ctx, c.address); err != nil {
+ return err
+ } else if len(code) == 0 {
+ return ErrNoCode
+ }
+ }
+ } else {
+ output, err = c.caller.CallContract(ctx, msg, nil)
+ if err == nil && len(output) == 0 {
+ // Make sure we have a contract to operate on, and bail out otherwise.
+ if code, err = c.caller.CodeAt(ctx, c.address, nil); err != nil {
+ return err
+ } else if len(code) == 0 {
+ return ErrNoCode
+ }
+ }
+ }
if err != nil {
return err
}
@@ -158,7 +172,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
}
nonce := uint64(0)
if opts.Nonce == nil {
- nonce, err = c.transactor.PendingAccountNonce(opts.Context, opts.From)
+ nonce, err = c.transactor.PendingNonceAt(ensureContext(opts.Context), opts.From)
if err != nil {
return nil, fmt.Errorf("failed to retrieve account nonce: %v", err)
}
@@ -168,7 +182,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
// Figure out the gas allowance and gas price values
gasPrice := opts.GasPrice
if gasPrice == nil {
- gasPrice, err = c.transactor.SuggestGasPrice(opts.Context)
+ gasPrice, err = c.transactor.SuggestGasPrice(ensureContext(opts.Context))
if err != nil {
return nil, fmt.Errorf("failed to suggest gas price: %v", err)
}
@@ -176,18 +190,18 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
gasLimit := opts.GasLimit
if gasLimit == nil {
// Gas estimation cannot succeed without code for method invocations
- if contract != nil && atomic.LoadUint32(&c.pendingHasCode) == 0 {
- if code, err := c.transactor.HasCode(opts.Context, c.address, true); err != nil {
+ if contract != nil {
+ if code, err := c.transactor.PendingCodeAt(ensureContext(opts.Context), c.address); err != nil {
return nil, err
- } else if !code {
+ } else if len(code) == 0 {
return nil, ErrNoCode
}
- atomic.StoreUint32(&c.pendingHasCode, 1)
}
// If the contract surely has code (or code is not needed), estimate the transaction
- gasLimit, err = c.transactor.EstimateGasLimit(opts.Context, opts.From, contract, value, input)
+ msg := ethereum.CallMsg{From: opts.From, To: contract, Value: value, Data: input}
+ gasLimit, err = c.transactor.EstimateGas(ensureContext(opts.Context), msg)
if err != nil {
- return nil, fmt.Errorf("failed to exstimate gas needed: %v", err)
+ return nil, fmt.Errorf("failed to estimate gas needed: %v", err)
}
}
// Create the transaction, sign it and schedule it for execution
@@ -204,8 +218,15 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
if err != nil {
return nil, err
}
- if err := c.transactor.SendTransaction(opts.Context, signedTx); err != nil {
+ if err := c.transactor.SendTransaction(ensureContext(opts.Context), signedTx); err != nil {
return nil, err
}
return signedTx, nil
}
+
+func ensureContext(ctx context.Context) context.Context {
+ if ctx == nil {
+ return context.TODO()
+ }
+ return ctx
+}
generated by cgit (git 2.34.1) at 2024-11-15 10:49:12 +0800