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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| package common | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
|
|
||
| "github.com/ethereum/go-ethereum/accounts/abi" | ||
| ) | ||
|
|
||
| func ConstructFunctionABI(signature string) (*abi.Method, error) { | ||
| regex := regexp.MustCompile(`^(\w+)\((.*)\)$`) | ||
| matches := regex.FindStringSubmatch(strings.TrimSpace(signature)) | ||
| if len(matches) != 3 { | ||
| return nil, fmt.Errorf("invalid event signature format") | ||
| } | ||
|
|
||
| functionName := matches[1] | ||
| params := matches[2] | ||
|
|
||
| inputs, err := parseParamsToAbiArguments(params) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse params to abi arguments '%s': %v", params, err) | ||
| } | ||
|
|
||
| function := abi.NewMethod(functionName, functionName, abi.Function, "", false, false, inputs, nil) | ||
|
|
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| return &function, nil | ||
| } | ||
|
|
||
| func parseParamsToAbiArguments(params string) (abi.Arguments, error) { | ||
| paramList := splitParams(strings.TrimSpace(params)) | ||
| var inputs abi.Arguments | ||
| for idx, param := range paramList { | ||
| arg, err := parseParamToAbiArgument(param, fmt.Sprintf("%d", idx)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse param to arg '%s': %v", param, err) | ||
| } | ||
| inputs = append(inputs, *arg) | ||
| } | ||
| return inputs, nil | ||
| } | ||
|
|
||
| /** | ||
| * Splits a string of parameters into a list of parameters | ||
| */ | ||
| func splitParams(params string) []string { | ||
| var result []string | ||
| depth := 0 | ||
| current := "" | ||
| for _, r := range params { | ||
| switch r { | ||
| case ',': | ||
| if depth == 0 { | ||
| result = append(result, strings.TrimSpace(current)) | ||
| current = "" | ||
| continue | ||
| } | ||
| case '(': | ||
| depth++ | ||
| case ')': | ||
| depth-- | ||
| } | ||
| current += string(r) | ||
| } | ||
| if strings.TrimSpace(current) != "" { | ||
| result = append(result, strings.TrimSpace(current)) | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| func parseParamToAbiArgument(param string, fallbackName string) (*abi.Argument, error) { | ||
| argName, paramType, err := getArgNameAndType(param, fallbackName) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get arg name and type '%s': %v", param, err) | ||
| } | ||
| if isTuple(paramType) { | ||
| argType, err := marshalTupleParamToArgumentType(paramType) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to marshal tuple: %v", err) | ||
| } | ||
| return &abi.Argument{ | ||
| Name: argName, | ||
| Type: argType, | ||
| }, nil | ||
| } else { | ||
| argType, err := abi.NewType(paramType, paramType, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse type '%s': %v", paramType, err) | ||
| } | ||
| return &abi.Argument{ | ||
| Name: argName, | ||
| Type: argType, | ||
| }, nil | ||
| } | ||
| } | ||
|
|
||
| func getArgNameAndType(param string, fallbackName string) (name string, paramType string, err error) { | ||
| if isTuple(param) { | ||
| lastParenIndex := strings.LastIndex(param, ")") | ||
| if lastParenIndex == -1 { | ||
| return "", "", fmt.Errorf("invalid tuple format") | ||
| } | ||
| if len(param)-1 == lastParenIndex { | ||
| return fallbackName, param, nil | ||
| } | ||
| paramsEndIdx := lastParenIndex + 1 | ||
| if strings.HasPrefix(param[paramsEndIdx:], "[]") { | ||
| paramsEndIdx = lastParenIndex + 3 | ||
| } | ||
| return strings.TrimSpace(param[paramsEndIdx:]), param[:paramsEndIdx], nil | ||
| } else { | ||
| tokens := strings.Fields(param) | ||
| if len(tokens) == 1 { | ||
| return fallbackName, strings.TrimSpace(tokens[0]), nil | ||
| } | ||
| return strings.TrimSpace(tokens[len(tokens)-1]), strings.Join(tokens[:len(tokens)-1], " "), nil | ||
| } | ||
| } | ||
|
|
||
| func isTuple(param string) bool { | ||
| return strings.HasPrefix(param, "(") | ||
| } | ||
|
|
||
| func marshalTupleParamToArgumentType(paramType string) (abi.Type, error) { | ||
| typ := "tuple" | ||
| isSlice := strings.HasSuffix(paramType, "[]") | ||
| strippedParamType := strings.TrimPrefix(paramType, "(") | ||
| if isSlice { | ||
| strippedParamType = strings.TrimSuffix(strippedParamType, "[]") | ||
| typ = "tuple[]" | ||
| } | ||
| strippedParamType = strings.TrimSuffix(strippedParamType, ")") | ||
| components, err := marshalParamArguments(strippedParamType) | ||
| if err != nil { | ||
| return abi.Type{}, fmt.Errorf("failed to marshal tuple: %v", err) | ||
| } | ||
| return abi.NewType(typ, typ, components) | ||
| } | ||
|
|
||
| func marshalParamArguments(param string) ([]abi.ArgumentMarshaling, error) { | ||
| paramList := splitParams(param) | ||
| components := []abi.ArgumentMarshaling{} | ||
| for idx, param := range paramList { | ||
| argName, paramType, err := getArgNameAndType(param, fmt.Sprintf("field%d", idx)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get arg name and type '%s': %v", param, err) | ||
| } | ||
| if isTuple(paramType) { | ||
| subComponents, err := marshalParamArguments(paramType[1 : len(paramType)-1]) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to marshal tuple: %v", err) | ||
| } | ||
| components = append(components, abi.ArgumentMarshaling{ | ||
| Type: "tuple", | ||
| Name: argName, | ||
| Components: subComponents, | ||
| }) | ||
| } else { | ||
| components = append(components, abi.ArgumentMarshaling{ | ||
| Type: paramType, | ||
| Name: argName, | ||
| }) | ||
| } | ||
| } | ||
| return components, nil | ||
| } |
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