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accounts/abi/bind: handle UnpackLog with zero topics (#26920)

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Adds error handling for the case that UnpackLog or UnpackLogIntoMap is called with a log that has zero topics.

---------

Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
This commit is contained in:
aaronbuchwald 2023-03-31 02:35:29 -04:00 committed by GitHub
parent b92d0ea3bb
commit 00a73fbcce
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 32 additions and 2 deletions
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17
accounts/abi/bind/base.go
View File

@ -34,6 +34,11 @@ import (
const basefeeWiggleMultiplier = 2
var (
errNoEventSignature = errors.New("no event signature")
errEventSignatureMismatch = errors.New("event signature mismatch")
)
// SignerFn is a signer function callback when a contract requires a method to
// sign the transaction before submission.
type SignerFn func(common.Address, *types.Transaction) (*types.Transaction, error)
@ -488,8 +493,12 @@ func (c *BoundContract) WatchLogs(opts *WatchOpts, name string, query ...[]inter
// UnpackLog unpacks a retrieved log into the provided output structure.
func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log) error {
// Anonymous events are not supported.
if len(log.Topics) == 0 {
return errNoEventSignature
}
if log.Topics[0] != c.abi.Events[event].ID {
return fmt.Errorf("event signature mismatch")
return errEventSignatureMismatch
}
if len(log.Data) > 0 {
if err := c.abi.UnpackIntoInterface(out, event, log.Data); err != nil {
@ -507,8 +516,12 @@ func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log)
// UnpackLogIntoMap unpacks a retrieved log into the provided map.
func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event string, log types.Log) error {
// Anonymous events are not supported.
if len(log.Topics) == 0 {
return errNoEventSignature
}
if log.Topics[0] != c.abi.Events[event].ID {
return fmt.Errorf("event signature mismatch")
return errEventSignatureMismatch
}
if len(log.Data) > 0 {
if err := c.abi.UnpackIntoMap(out, event, log.Data); err != nil {

17
accounts/abi/bind/base_test.go
View File

@ -186,6 +186,23 @@ func TestUnpackIndexedStringTyLogIntoMap(t *testing.T) {
unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
}
func TestUnpackAnonymousLogIntoMap(t *testing.T) {
mockLog := newMockLog(nil, common.HexToHash("0x0"))
abiString := `[{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"received","type":"event"}]`
parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)
var received map[string]interface{}
err := bc.UnpackLogIntoMap(received, "received", mockLog)
if err == nil {
t.Error("unpacking anonymous event is not supported")
}
if err.Error() != "no event signature" {
t.Errorf("expected error 'no event signature', got '%s'", err)
}
}
func TestUnpackIndexedSliceTyLogIntoMap(t *testing.T) {
sliceBytes, err := rlp.EncodeToBytes([]string{"name1", "name2", "name3", "name4"})
if err != nil {