implement AstriaWithdrawer contract and ethereum watcher by noot · Pull Request #1086 · astriaorg/astria

noot · 2024-05-20T20:44:22Z

Summary

implement ethereum module for astria-bridge-withdrawer.

Background

required to read from the astria withdrawal evm contract.

Changes

implement AstriaWithdrawer.sol contract, put inside ethereum/ dir as a foundry project
implement ethereum module which contains a Watcher that watches the contract for Withdrawal events
the events are sent to a Batcher which batches all events by block number and sends a batch of events to a sequencer handler (to be implemented later)

Testing

unit tests

Related Issues

#913

noot · 2024-05-21T20:56:01Z

crates/astria-bridge-withdrawer/ethereum/out/AstriaWithdrawer.sol/AstriaWithdrawer.json

@@ -0,0 +1 @@
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i committed this because otherwise we have to install foundry in ci which was painful last time - however this will need to be updated if the contract changes. thoughts?

i agree - its nicer to have these committed rather than having to deal with with foundry every time.

Absolutely agreed here

itamarreif

Only thing that sticks out to me is back pressure:

both the watcher->batcher and the batcher->submitter channels have capacity of 100
both use send() instead of send_timeout()
submitter logic will use broadcast_tx_commit so might take a bit of time in the event of a congested mempool on the sequencer side
if withdraws for 100 entire blocks clog up the batcher->submitter channel, the next 100 individual withdraws will clog up the watcher->batcher channel

doesn't seem like too big of a problem if we choose the right values for channel sizes (100 is probably fine) but figured it would be useful to flag and maybe clarify somewhere in the documentation

SuperFluffy · 2024-05-22T11:53:44Z

crates/astria-bridge-withdrawer/ethereum/README.md

Does this also need information on how to initialize the submodule?

i think forge build should automatically do it

SuperFluffy · 2024-05-22T11:56:27Z

crates/astria-bridge-withdrawer/ethereum/lib/forge-std

Why the submodule? Could one use forge to install forge-std?

yeah, this is just how foundry is set up, forge build should install everything. we don't use the forge-std deps right now but if we want to add solidity unit tests we will

noot · 2024-05-22T16:49:38Z

doesn't seem like too big of a problem if we choose the right values for channel sizes (100 is probably fine) but figured it would be useful to flag and maybe clarify somewhere in the documentation

yeah this is pretty arbitrary, i just picked a random number basically. i suppose the watcher->batcher channel will probably have more items than the batcher->submitter, so maybe the value for that should be higher. i can add a comment for now saying the values are arbitrary

both use send() instead of send_timeout()

i think send_timeout would be kinda bad, since we want to guarantee 1 eth block of withdrawals -> 1 sequencer tx without missing any, if there's timeouts there's a chance a tx within the block could be missed? i'd prefer that if anything fails to send, we just error at this point. not against timeouts but depends how we implement tracking txs that have been submitted

noot added 8 commits May 20, 2024 16:43

implement AstriaWithdrawer contract and ethereum watcher

05749be

merge

0d91a43

fix withdrawal batcher, test working

1bd6d78

remove unused bridge mod

733f13c

force commit contract build artifact

d238ea3

update ethereum readme

bf78ff6

clippy

4eff848

attempt to add solc install to github workflow

06eacb5

github-actions bot added the ci issues that are related to ci and github workflows label May 21, 2024

noot marked this pull request as ready for review May 21, 2024 20:52

noot requested review from a team, SuperFluffy and joroshiba as code owners May 21, 2024 20:52

cache pip installs

01fb552

noot commented May 21, 2024

View reviewed changes

fix ci tests?

9fec7db

itamarreif approved these changes May 21, 2024

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SuperFluffy reviewed May 22, 2024

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noot merged commit 6b3e883 into itamarreif/bridge-scaffolding May 22, 2024

noot deleted the noot/withdrawer-eth-watcher branch May 22, 2024 16:49

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implement AstriaWithdrawer contract and ethereum watcher#1086

implement AstriaWithdrawer contract and ethereum watcher#1086
noot merged 10 commits intoitamarreif/bridge-scaffoldingfrom
noot/withdrawer-eth-watcher

noot commented May 20, 2024 •

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		@@ -0,0 +1 @@
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