accounts/abi,accounts/abi/bind: add payable features into contract bindings

Signed-off-by: RJ Catalano <rj@monax.io>

accounts/abi/abi.go

@@ -33,6 +33,7 @@ type ABI struct {
 	Constructor Method
 	Methods     map[string]Method
 	Events      map[string]Event
+	Fallback    Method
 }
 
 // JSON returns a parsed ABI interface and error if it failed.
@@ -185,6 +186,7 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 		Constant  bool
 		Indexed   bool
 		Anonymous bool
+		Payable   bool
 		Inputs    []Argument
 		Outputs   []Argument
 	}
@@ -202,12 +204,13 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 				Inputs: field.Inputs,
 			}
 		// empty defaults to function according to the abi spec
-		case "function", "":
+		case "function":
 			abi.Methods[field.Name] = Method{
 				Name:    field.Name,
 				Const:   field.Constant,
 				Inputs:  field.Inputs,
 				Outputs: field.Outputs,
+				Payable: field.Payable,
 			}
 		case "event":
 			abi.Events[field.Name] = Event{
@@ -215,6 +218,10 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 				Anonymous: field.Anonymous,
 				Inputs:    field.Inputs,
 			}
+		case "fallback":
+			abi.Fallback = Method{
+				Payable: field.Payable,
+			}
 		}
 	}
 

accounts/abi/bind/base.go

@@ -152,6 +152,11 @@ func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...in
 	if err != nil {
 		return nil, err
 	}
+	// check to make sure method is payable and if not, make sure that there is no
+	// value being transported with this transaction
+	if !c.abi.Methods[method].Payable && 0 != opts.Value.Cmp(common.Big0) {
+		return nil, fmt.Errorf("bind: value %v sent to non payable method %v", opts.Value.String(), method)
+	}
 	return c.transact(opts, &c.address, input)
 }
 

accounts/abi/bind/bind.go

@@ -67,6 +67,7 @@ func Bind(types []string, abis []string, bytecodes []string, pkg string, lang La
 		var (
 			calls     = make(map[string]*tmplMethod)
 			transacts = make(map[string]*tmplMethod)
+			writes    = make(map[string]*tmplMethod)
 		)
 		for _, original := range evmABI.Methods {
 			// Normalize the method for capital cases and non-anonymous inputs/outputs
@@ -90,8 +91,10 @@ func Bind(types []string, abis []string, bytecodes []string, pkg string, lang La
 			// Append the methods to the call or transact lists
 			if original.Const {
 				calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
-			} else {
+			} else if original.Payable {
 				transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
+			} else {
+				writes[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
 			}
 		}
 		contracts[types[i]] = &tmplContract{
@@ -99,8 +102,10 @@ func Bind(types []string, abis []string, bytecodes []string, pkg string, lang La
 			InputABI:    strings.Replace(strippedABI, "\"", "\\\"", -1),
 			InputBin:    strings.TrimSpace(bytecodes[i]),
 			Constructor: evmABI.Constructor,
+			Fallback:    evmABI.Fallback,
 			Calls:       calls,
 			Transacts:   transacts,
+			Writes:      writes,
 		}
 	}
 	// Generate the contract template data content and render it

accounts/abi/bind/template.go

@@ -30,6 +30,7 @@ type tmplContract struct {
 	InputABI    string                 // JSON ABI used as the input to generate the binding from
 	InputBin    string                 // Optional EVM bytecode used to denetare deploy code from
 	Constructor abi.Method             // Contract constructor for deploy parametrization
+	Fallback    abi.Method             // Contract fallback method for direct interaction with contract
 	Calls       map[string]*tmplMethod // Contract calls that only read state data
 	Transacts   map[string]*tmplMethod // Contract calls that write state data
 }

accounts/abi/method.go

@@ -34,6 +34,7 @@ import (
 // Input specifies the required input parameters for this gives method.
 type Method struct {
 	Name    string
+	Payable bool
 	Const   bool
 	Inputs  []Argument
 	Outputs []Argument