diff options
Diffstat (limited to 'accounts/abi/abi.go')
| -rw-r--r-- | accounts/abi/abi.go | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/accounts/abi/abi.go b/accounts/abi/abi.go deleted file mode 100644 index 7af6685..0000000 --- a/accounts/abi/abi.go +++ /dev/null @@ -1,192 +0,0 @@ -// Copyright 2015 The go-ethereum Authors -// This file is part of the go-ethereum library. -// -// The go-ethereum library is free software: you can redistribute it and/or modify -// it under the terms of the GNU Lesser General Public License as published by -// the Free Software Foundation, either version 3 of the License, or -// (at your option) any later version. -// -// The go-ethereum library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU Lesser General Public License for more details. -// -// You should have received a copy of the GNU Lesser General Public License -// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. - -package abi - -import ( - "bytes" - "encoding/json" - "fmt" - "io" - - "github.com/ava-labs/go-ethereum/common" -) - -// The ABI holds information about a contract's context and available -// invokable methods. It will allow you to type check function calls and -// packs data accordingly. -type ABI struct { - Constructor Method - Methods map[string]Method - Events map[string]Event -} - -// JSON returns a parsed ABI interface and error if it failed. -func JSON(reader io.Reader) (ABI, error) { - dec := json.NewDecoder(reader) - - var abi ABI - if err := dec.Decode(&abi); err != nil { - return ABI{}, err - } - - return abi, nil -} - -// Pack the given method name to conform the ABI. Method call's data -// will consist of method_id, args0, arg1, ... argN. Method id consists -// of 4 bytes and arguments are all 32 bytes. -// Method ids are created from the first 4 bytes of the hash of the -// methods string signature. (signature = baz(uint32,string32)) -func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) { - // Fetch the ABI of the requested method - if name == "" { - // constructor - arguments, err := abi.Constructor.Inputs.Pack(args...) - if err != nil { - return nil, err - } - return arguments, nil - } - method, exist := abi.Methods[name] - if !exist { - return nil, fmt.Errorf("method '%s' not found", name) - } - arguments, err := method.Inputs.Pack(args...) - if err != nil { - return nil, err - } - // Pack up the method ID too if not a constructor and return - return append(method.ID(), arguments...), nil -} - -// Unpack output in v according to the abi specification -func (abi ABI) Unpack(v interface{}, name string, data []byte) (err error) { - if len(data) == 0 { - return fmt.Errorf("abi: unmarshalling empty output") - } - // since there can't be naming collisions with contracts and events, - // we need to decide whether we're calling a method or an event - if method, ok := abi.Methods[name]; ok { - if len(data)%32 != 0 { - return fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(data), data) - } - return method.Outputs.Unpack(v, data) - } - if event, ok := abi.Events[name]; ok { - return event.Inputs.Unpack(v, data) - } - return fmt.Errorf("abi: could not locate named method or event") -} - -// UnpackIntoMap unpacks a log into the provided map[string]interface{} -func (abi ABI) UnpackIntoMap(v map[string]interface{}, name string, data []byte) (err error) { - if len(data) == 0 { - return fmt.Errorf("abi: unmarshalling empty output") - } - // since there can't be naming collisions with contracts and events, - // we need to decide whether we're calling a method or an event - if method, ok := abi.Methods[name]; ok { - if len(data)%32 != 0 { - return fmt.Errorf("abi: improperly formatted output") - } - return method.Outputs.UnpackIntoMap(v, data) - } - if event, ok := abi.Events[name]; ok { - return event.Inputs.UnpackIntoMap(v, data) - } - return fmt.Errorf("abi: could not locate named method or event") -} - -// UnmarshalJSON implements json.Unmarshaler interface -func (abi *ABI) UnmarshalJSON(data []byte) error { - var fields []struct { - Type string - Name string - Constant bool - Anonymous bool - Inputs []Argument - Outputs []Argument - } - if err := json.Unmarshal(data, &fields); err != nil { - return err - } - abi.Methods = make(map[string]Method) - abi.Events = make(map[string]Event) - for _, field := range fields { - switch field.Type { - case "constructor": - abi.Constructor = Method{ - Inputs: field.Inputs, - } - // empty defaults to function according to the abi spec - case "function", "": - name := field.Name - _, ok := abi.Methods[name] - for idx := 0; ok; idx++ { - name = fmt.Sprintf("%s%d", field.Name, idx) - _, ok = abi.Methods[name] - } - abi.Methods[name] = Method{ - Name: name, - RawName: field.Name, - Const: field.Constant, - Inputs: field.Inputs, - Outputs: field.Outputs, - } - case "event": - name := field.Name - _, ok := abi.Events[name] - for idx := 0; ok; idx++ { - name = fmt.Sprintf("%s%d", field.Name, idx) - _, ok = abi.Events[name] - } - abi.Events[name] = Event{ - Name: name, - RawName: field.Name, - Anonymous: field.Anonymous, - Inputs: field.Inputs, - } - } - } - - return nil -} - -// MethodById looks up a method by the 4-byte id -// returns nil if none found -func (abi *ABI) MethodById(sigdata []byte) (*Method, error) { - if len(sigdata) < 4 { - return nil, fmt.Errorf("data too short (%d bytes) for abi method lookup", len(sigdata)) - } - for _, method := range abi.Methods { - if bytes.Equal(method.ID(), sigdata[:4]) { - return &method, nil - } - } - return nil, fmt.Errorf("no method with id: %#x", sigdata[:4]) -} - -// EventByID looks an event up by its topic hash in the -// ABI and returns nil if none found. -func (abi *ABI) EventByID(topic common.Hash) (*Event, error) { - for _, event := range abi.Events { - if bytes.Equal(event.ID().Bytes(), topic.Bytes()) { - return &event, nil - } - } - return nil, fmt.Errorf("no event with id: %#x", topic.Hex()) -} |