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authorDeterminant <[email protected]>2020-06-28 14:47:41 -0400
committerDeterminant <[email protected]>2020-06-28 14:47:41 -0400
commitd235e2c6a5788ec4a6cff15a16f56b38a3876a0d (patch)
tree5f2727f7a50ee5840f889c82776d3a30a88dd59b /accounts/abi/event.go
parent13ebd8bd9468e9d769d598b0ca2afb72ba78cb97 (diff)
...
Diffstat (limited to 'accounts/abi/event.go')
-rw-r--r--accounts/abi/event.go77
1 files changed, 77 insertions, 0 deletions
diff --git a/accounts/abi/event.go b/accounts/abi/event.go
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+// Copyright 2016 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 (
+ "fmt"
+ "strings"
+
+ "github.com/ava-labs/go-ethereum/common"
+ "github.com/ava-labs/go-ethereum/crypto"
+)
+
+// Event is an event potentially triggered by the EVM's LOG mechanism. The Event
+// holds type information (inputs) about the yielded output. Anonymous events
+// don't get the signature canonical representation as the first LOG topic.
+type Event struct {
+ // Name is the event name used for internal representation. It's derived from
+ // the raw name and a suffix will be added in the case of a event overload.
+ //
+ // e.g.
+ // There are two events have same name:
+ // * foo(int,int)
+ // * foo(uint,uint)
+ // The event name of the first one wll be resolved as foo while the second one
+ // will be resolved as foo0.
+ Name string
+ // RawName is the raw event name parsed from ABI.
+ RawName string
+ Anonymous bool
+ Inputs Arguments
+}
+
+func (e Event) String() string {
+ inputs := make([]string, len(e.Inputs))
+ for i, input := range e.Inputs {
+ inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name)
+ if input.Indexed {
+ inputs[i] = fmt.Sprintf("%v indexed %v", input.Type, input.Name)
+ }
+ }
+ return fmt.Sprintf("event %v(%v)", e.RawName, strings.Join(inputs, ", "))
+}
+
+// Sig returns the event string signature according to the ABI spec.
+//
+// Example
+//
+// event foo(uint32 a, int b) = "foo(uint32,int256)"
+//
+// Please note that "int" is substitute for its canonical representation "int256"
+func (e Event) Sig() string {
+ types := make([]string, len(e.Inputs))
+ for i, input := range e.Inputs {
+ types[i] = input.Type.String()
+ }
+ return fmt.Sprintf("%v(%v)", e.RawName, strings.Join(types, ","))
+}
+
+// ID returns the canonical representation of the event's signature used by the
+// abi definition to identify event names and types.
+func (e Event) ID() common.Hash {
+ return common.BytesToHash(crypto.Keccak256([]byte(e.Sig())))
+}