Use debug traces to extract the input for settlement::Observer #3245
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| return Some(call_frame); | ||
| } | ||
| // Add all nested calls to the queue | ||
| queue.extend(&call_frame.calls); |
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I think if you were to use a Vec for the stack these callframes should be added to the stack in reverse order.
Otherwise you'd first decent down the last child call - not the first one, right?
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Yeah. So bottom line, using queue with pop-ing from front is breadth-first, while using vec with extending in reverse order would be depth-first search, if i'm not wrong. With that, I am not sure which one has a higher chance of finding the calldata faster, so both of them seem fine to me, so I went with breadth-first.
Maybe breadth-first is faster since settle calldata will probably be in one of the first layers of subcalls.
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Hmm, interesting. Didn't even occur to me to use BFS to analyze a call stack since DFS is the natural flow of the program. But I agree that BFS would probably find the important stack frame faster. 👍
Adding a small comment about the BFS approach would be nice, though.
Also while thinking about the differences between DFS and BFS I realized that an SC solver could execute 2 settlements in a single call. I believe this would probably trip up our indexing logic. Would be good to check what needs to be changed to accommodate that edge case.
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Multiple settlements per transaction are not supported by our system (this is not the only place where it would be an issue). If you are worried about it, I would suggest defining a circuit breaker rule that would forbid it.
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| /// Taken from alloy::rpc::types::trace::geth::CallFrame | ||
| #[derive(Clone, Debug, Default, PartialEq, Eq, Deserialize)] | ||
| pub struct CallFrame { |
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This exact type exists twice. Once in the infra module and once in the domain module. I suspect we only need one of them.
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I don't want to have deserialization specifics in the domain.
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Hmm, I see. I wonder if this and the debug_trace logic might not be better placed in the ethrpc crate.
We might as well make this easily reusable with an extension trait. It's a bit awkward that the web3 crate does not support the debug module out of the box but AFAICS we could add a new namespace for debug which can have the trace_transaction functionality.
Description
A second attempt to resolve #3177
(first attempt was here: #3233)
Now, we try to use
debug_traceTransactioninstead oftrace_transaction, to find call traces to extract the right one -> settle call to settlement contract.For a difference from first attempt, review just the commits after "revert".
Changes
debug_traceTransactionto find /settle call instead of usingtransaction.inputdirectly.How to test
e2e tests show that the code is correct and that deserialization works properly.
manually tested the
debug_traceTransactionon different networks and rpc nodes. (reth ok, alchemy ok, arbitrum ovh nodes ok, just to verify arbitrum nitro)