github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/accounts/abi/event.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package abi
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  
    23  	"github.com/ethereumproject/go-ethereum/common"
    24  	"github.com/ethereumproject/go-ethereum/crypto"
    25  )
    26  
    27  // Event is an event potentially triggered by the EVM's LOG mechanism. The Event
    28  // holds type information (inputs) about the yielded output
    29  type Event struct {
    30  	Name   string
    31  	Inputs []Argument
    32  }
    33  
    34  // Id returns the canonical representation of the event's signature used by the
    35  // abi definition to identify event names and types.
    36  func (e Event) Id() common.Hash {
    37  	types := make([]string, len(e.Inputs))
    38  	i := 0
    39  	for _, input := range e.Inputs {
    40  		types[i] = input.Type.String()
    41  		i++
    42  	}
    43  	return common.BytesToHash(crypto.Keccak256([]byte(fmt.Sprintf("%v(%v)", e.Name, strings.Join(types, ",")))))
    44  }