Merge pull request #2405 from karalabe/abigen-default-methods

accounts/abi/bind: surface raw wrappers to access low level ops

accounts/abi/bind/base.go

@@ -108,8 +108,7 @@ func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string,
 	return c.abi.Unpack(result, method, output)
 }
 
-// Transact invokes the (paid) contract method with params as input values and
+// Transact invokes the (paid) contract method with params as input values.
-// value as the fund transfer to the contract.
 func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
 	// Otherwise pack up the parameters and invoke the contract
 	input, err := c.abi.Pack(method, params...)
@@ -119,6 +118,12 @@ func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...in
 	return c.transact(opts, &c.address, input)
 }
 
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (c *BoundContract) Transfer(opts *TransactOpts) (*types.Transaction, error) {
+	return c.transact(opts, &c.address, nil)
+}
+
 // transact executes an actual transaction invocation, first deriving any missing
 // authorization fields, and then scheduling the transaction for execution.
 func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, input []byte) (*types.Transaction, error) {

accounts/abi/bind/bind_test.go

@@ -228,6 +228,45 @@ var bindTests = []struct {
 			}
 		`,
 	},
+	// Tests that anonymous default methods can be correctly invoked
+	{
+		`Defaulter`,
+		`
+			contract Defaulter {
+				address public caller;
+
+				function() {
+					caller = msg.sender;
+				}
+			}
+		`,
+		`6060604052606a8060106000396000f360606040523615601d5760e060020a6000350463fc9c8d3981146040575b605e6000805473ffffffffffffffffffffffffffffffffffffffff191633179055565b606060005473ffffffffffffffffffffffffffffffffffffffff1681565b005b6060908152602090f3`,
+		`[{"constant":true,"inputs":[],"name":"caller","outputs":[{"name":"","type":"address"}],"type":"function"}]`,
+		`
+			// Generate a new random account and a funded simulator
+			key := crypto.NewKey(rand.Reader)
+			sim := backends.NewSimulatedBackend(core.GenesisAccount{Address: key.Address, Balance: big.NewInt(10000000000)})
+
+			// Convert the tester key to an authorized transactor for ease of use
+			auth := bind.NewKeyedTransactor(key)
+
+			// Deploy a default method invoker contract and execute its default method
+			_, _, defaulter, err := DeployDefaulter(auth, sim)
+			if err != nil {
+				t.Fatalf("Failed to deploy defaulter contract: %v", err)
+			}
+			if _, err := (&DefaulterRaw{defaulter}).Transfer(auth); err != nil {
+				t.Fatalf("Failed to invoke default method: %v", err)
+			}
+			sim.Commit()
+
+			if caller, err := defaulter.Caller(nil); err != nil {
+				t.Fatalf("Failed to call address retriever: %v", err)
+			} else if (caller != key.Address) {
+				t.Fatalf("Address mismatch: have %v, want %v", caller, key.Address)
+			}
+		`,
+	},
 }
 
 // Tests that packages generated by the binder can be successfully compiled and

accounts/abi/bind/template.go

@@ -110,6 +110,21 @@ package {{.Package}}
 	  TransactOpts bind.TransactOpts    // Transaction auth options to use throughout this session
 	}
 
+	// {{.Type}}Raw is an auto generated low-level Go binding around an Ethereum contract.
+	type {{.Type}}Raw struct {
+	  Contract *{{.Type}} // Generic contract binding to access the raw methods on
+	}
+
+	// {{.Type}}CallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
+	type {{.Type}}CallerRaw struct {
+		Contract *{{.Type}}Caller // Generic read-only contract binding to access the raw methods on
+	}
+
+	// {{.Type}}TransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
+	type {{.Type}}TransactorRaw struct {
+		Contract *{{.Type}}Transactor // Generic write-only contract binding to access the raw methods on
+	}
+
 	// New{{.Type}} creates a new instance of {{.Type}}, bound to a specific deployed contract.
 	func New{{.Type}}(address common.Address, backend bind.ContractBackend) (*{{.Type}}, error) {
 	  contract, err := bind{{.Type}}(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))
@@ -146,6 +161,44 @@ package {{.Package}}
 	  return bind.NewBoundContract(address, parsed, caller, transactor), nil
 	}
 
+	// Call invokes the (constant) contract method with params as input values and
+	// sets the output to result. The result type might be a single field for simple
+	// returns, a slice of interfaces for anonymous returns and a struct for named
+	// returns.
+	func (_{{$contract.Type}} *{{$contract.Type}}Raw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+		return _{{$contract.Type}}.Contract.{{$contract.Type}}Caller.contract.Call(opts, result, method, params...)
+	}
+
+	// Transfer initiates a plain transaction to move funds to the contract, calling
+	// its default method if one is available.
+	func (_{{$contract.Type}} *{{$contract.Type}}Raw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+		return _{{$contract.Type}}.Contract.{{$contract.Type}}Transactor.contract.Transfer(opts)
+	}
+
+	// Transact invokes the (paid) contract method with params as input values.
+	func (_{{$contract.Type}} *{{$contract.Type}}Raw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+		return _{{$contract.Type}}.Contract.{{$contract.Type}}Transactor.contract.Transact(opts, method, params...)
+	}
+
+	// Call invokes the (constant) contract method with params as input values and
+	// sets the output to result. The result type might be a single field for simple
+	// returns, a slice of interfaces for anonymous returns and a struct for named
+	// returns.
+	func (_{{$contract.Type}} *{{$contract.Type}}CallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+		return _{{$contract.Type}}.Contract.contract.Call(opts, result, method, params...)
+	}
+
+	// Transfer initiates a plain transaction to move funds to the contract, calling
+	// its default method if one is available.
+	func (_{{$contract.Type}} *{{$contract.Type}}TransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+		return _{{$contract.Type}}.Contract.contract.Transfer(opts)
+	}
+
+	// Transact invokes the (paid) contract method with params as input values.
+	func (_{{$contract.Type}} *{{$contract.Type}}TransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+		return _{{$contract.Type}}.Contract.contract.Transact(opts, method, params...)
+	}
+
 	{{range .Calls}}
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
 		//