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eth/filters: exit early if topics-filter has more than 4 topics (#28494)

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Currently, geth's will return `[]` for any `len(topics) > 4` log filter. The EVM only supports up to four logs, via LOG4 opcode, so larger criterias fail. This change makes the filter query exit early in those cases.
This commit is contained in:
Delweng 2023-11-10 15:10:03 +08:00 committed by GitHub
parent f7dde2a96c
commit e38b9f1830
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 14 additions and 0 deletions
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7
eth/filters/api.go
View File

@ -37,8 +37,12 @@ var (
errInvalidTopic = errors.New("invalid topic(s)")
errFilterNotFound = errors.New("filter not found")
errInvalidBlockRange = errors.New("invalid block range params")
errExceedMaxTopics = errors.New("exceed max topics")
)
// The maximum number of topic criteria allowed, vm.LOG4 - vm.LOG0
const maxTopics = 4
// filter is a helper struct that holds meta information over the filter type
// and associated subscription in the event system.
type filter struct {
@ -334,6 +338,9 @@ func (api *FilterAPI) NewFilter(crit FilterCriteria) (rpc.ID, error) {
// GetLogs returns logs matching the given argument that are stored within the state.
func (api *FilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([]*types.Log, error) {
if len(crit.Topics) > maxTopics {
return nil, errExceedMaxTopics
}
var filter *Filter
if crit.BlockHash != nil {
// Block filter requested, construct a single-shot filter

3
eth/filters/filter_system.go
View File

@ -299,6 +299,9 @@ func (es *EventSystem) subscribe(sub *subscription) *Subscription {
// given criteria to the given logs channel. Default value for the from and to
// block is "latest". If the fromBlock > toBlock an error is returned.
func (es *EventSystem) SubscribeLogs(crit ethereum.FilterQuery, logs chan []*types.Log) (*Subscription, error) {
if len(crit.Topics) > maxTopics {
return nil, errExceedMaxTopics
}
var from, to rpc.BlockNumber
if crit.FromBlock == nil {
from = rpc.LatestBlockNumber

4
eth/filters/filter_system_test.go
View File

@ -386,6 +386,8 @@ func TestLogFilterCreation(t *testing.T) {
{FilterCriteria{FromBlock: big.NewInt(rpc.PendingBlockNumber.Int64()), ToBlock: big.NewInt(100)}, false},
// from block "higher" than to block
{FilterCriteria{FromBlock: big.NewInt(rpc.PendingBlockNumber.Int64()), ToBlock: big.NewInt(rpc.LatestBlockNumber.Int64())}, false},
// topics more then 4
{FilterCriteria{Topics: [][]common.Hash{{}, {}, {}, {}, {}}}, false},
}
)
@ -420,6 +422,7 @@ func TestInvalidLogFilterCreation(t *testing.T) {
0: {FromBlock: big.NewInt(rpc.PendingBlockNumber.Int64()), ToBlock: big.NewInt(rpc.LatestBlockNumber.Int64())},
1: {FromBlock: big.NewInt(rpc.PendingBlockNumber.Int64()), ToBlock: big.NewInt(100)},
2: {FromBlock: big.NewInt(rpc.LatestBlockNumber.Int64()), ToBlock: big.NewInt(100)},
3: {Topics: [][]common.Hash{{}, {}, {}, {}, {}}},
}
for i, test := range testCases {
@ -445,6 +448,7 @@ func TestInvalidGetLogsRequest(t *testing.T) {
0: {BlockHash: &blockHash, FromBlock: big.NewInt(100)},
1: {BlockHash: &blockHash, ToBlock: big.NewInt(500)},
2: {BlockHash: &blockHash, FromBlock: big.NewInt(rpc.LatestBlockNumber.Int64())},
3: {BlockHash: &blockHash, Topics: [][]common.Hash{{}, {}, {}, {}, {}}},
}
for i, test := range testCases {