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102 lines
3.3 KiB
Go
102 lines
3.3 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package abi
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import (
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"fmt"
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"strings"
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libcommon "github.com/ledgerwatch/erigon-lib/common"
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"github.com/ledgerwatch/erigon/crypto"
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)
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// Event is an event potentially triggered by the EVM's LOG mechanism. The Event
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// holds type information (inputs) about the yielded output. Anonymous events
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// don't get the signature canonical representation as the first LOG topic.
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type Event struct {
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// Name is the event name used for internal representation. It's derived from
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// the raw name and a suffix will be added in the case of a event overload.
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//
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// e.g.
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// These are two events that have the same name:
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// * foo(int,int)
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// * foo(uint,uint)
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// The event name of the first one wll be resolved as foo while the second one
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// will be resolved as foo0.
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Name string
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// RawName is the raw event name parsed from ABI.
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RawName string
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Anonymous bool
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Inputs Arguments
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str string
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// Sig contains the string signature according to the ABI spec.
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// e.g. event foo(uint32 a, int b) = "foo(uint32,int256)"
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// Please note that "int" is substitute for its canonical representation "int256"
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Sig string
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// ID returns the canonical representation of the event's signature used by the
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// abi definition to identify event names and types.
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ID libcommon.Hash
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}
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// NewEvent creates a new Event.
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// It sanitizes the input arguments to remove unnamed arguments.
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// It also precomputes the id, signature and string representation
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// of the event.
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func NewEvent(name, rawName string, anonymous bool, inputs Arguments) Event {
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// sanitize inputs to remove inputs without names
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// and precompute string and sig representation.
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names := make([]string, len(inputs))
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types := make([]string, len(inputs))
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for i, input := range inputs {
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if input.Name == "" {
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inputs[i] = Argument{
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Name: fmt.Sprintf("arg%d", i),
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Indexed: input.Indexed,
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Type: input.Type,
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}
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} else {
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inputs[i] = input
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}
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// string representation
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names[i] = fmt.Sprintf("%v %v", input.Type, inputs[i].Name)
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if input.Indexed {
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names[i] = fmt.Sprintf("%v indexed %v", input.Type, inputs[i].Name)
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}
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// sig representation
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types[i] = input.Type.String()
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}
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str := fmt.Sprintf("event %v(%v)", rawName, strings.Join(names, ", "))
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sig := fmt.Sprintf("%v(%v)", rawName, strings.Join(types, ","))
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id := libcommon.BytesToHash(crypto.Keccak256([]byte(sig)))
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return Event{
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Name: name,
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RawName: rawName,
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Anonymous: anonymous,
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Inputs: inputs,
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str: str,
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Sig: sig,
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ID: id,
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}
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}
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func (e Event) String() string {
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return e.str
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}
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