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eth/filters, eth/tracers: add request cancellation checks #26320

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merged 5 commits into from
Dec 15, 2022
Merged

eth/filters, eth/tracers: add request cancellation checks #26320

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eacf53d
eth/filters, eth/tracers: add request cancellation checks
fjl Dec 6, 2022
455f2f4
Update api.go
fjl Dec 7, 2022
2b87faa
eth/tracers: reduce block tracing channel buffer
fjl Dec 7, 2022
125954d
fix jobs chan length
s1na Dec 9, 2022
54a5986
eth: add cancel checks to StateAt* methods
s1na Dec 15, 2022
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3 changes: 3 additions & 0 deletions eth/filters/filter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,9 @@ func (f *Filter) unindexedLogs(ctx context.Context, end uint64) ([]*types.Log, e
var logs []*types.Log

for ; f.begin <= int64(end); f.begin++ {
if f.begin%10 == 0 && ctx.Err() != nil {
return logs, ctx.Err()
}
header, err := f.sys.backend.HeaderByNumber(ctx, rpc.BlockNumber(f.begin))
if header == nil || err != nil {
return logs, err
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12 changes: 11 additions & 1 deletion eth/tracers/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -547,6 +547,9 @@ func (api *API) IntermediateRoots(ctx context.Context, hash common.Hash, config
deleteEmptyObjects = chainConfig.IsEIP158(block.Number())
)
for i, tx := range block.Transactions() {
if err := ctx.Err(); err != nil {
return nil, err
}
var (
msg, _ = tx.AsMessage(signer, block.BaseFee())
txContext = core.NewEVMTxContext(msg)
Expand Down Expand Up @@ -638,12 +641,19 @@ func (api *API) traceBlock(ctx context.Context, block *types.Block, config *Trac
}
}()
}

// Feed the transactions into the tracers and return
var failed error
blockCtx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
for i, tx := range txs {
// Send the trace task over for execution
jobs <- &txTraceTask{statedb: statedb.Copy(), index: i}
task := &txTraceTask{statedb: statedb.Copy(), index: i}
select {
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Is this more efficient than simply checking ctx.Err() at the beginning of the loop?

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It's not more efficient, I just did it because the send could theoretically block at this point. Canceling the context would unblock it. However, it seems the jobs channel is actually buffered, and so the send will always succeed.

case jobs <- task:
case <-ctx.Done():
failed = ctx.Err()
break
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Classic mistake here, break here will terminate the select instead of enclosing loop.

}

// Generate the next state snapshot fast without tracing
msg, _ := tx.AsMessage(signer, block.BaseFee())
Expand Down