l2geth: forward tx to sequencer

[tuxcanfly]

Description

This PR makes it easier for replica nodes to handle a transaction submitted via RPC and to transparently forward it to the sequencer, based on the configured endpoint.

This allows the consumer of the replica node's RPC to directly submit transactions instead of having to rely on third-party applications.

Metadata

• Fixes Have replicas forward write requests to the Sequencer #1781

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Latest commit: 805a42c

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[codecov-commenter]

Codecov Report

Merging #2011 (805a42c) into develop (3174f03) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2011   +/-   ##
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  Coverage    74.58%   74.58%           
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  Files           79       79           
  Lines         2554     2554           
  Branches       401      401           
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  Hits          1905     1905           
  Misses         649      649           

Flag	Coverage Δ
batch-submitter	62.50% <ø> (ø)
contracts	90.48% <ø> (ø)
core-utils	57.50% <ø> (ø)
data-transport-layer	38.64% <ø> (ø)
message-relayer	70.86% <ø> (ø)
sdk	88.38% <ø> (ø)

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[tynes]

This looks good to me, some thoughts:

• We should have an integration test for this functionality, its really easy to add. This functionality should be preserved in the 1.0 release due to the public mempool being added back to the system. The logic would be similar to this:

  optimism/integration-tests/test/replica.spec.ts

  Line 54 in f3850f3

  const signed = await env.l2Wallet.signTransaction(tx)

 const signed = await env.l2Wallet.signTransaction(tx)
 const result = await env.replicaProvider.sendTransaction(signed)

let receipt: TransactionReceipt
while (!receipt) {
  receipt = await env.replicaProvider.getTransactionReceipt(result.hash)
  await sleep(200)
}

• Once l2geth: bring back unsupported RPC methods #2007, then the RPC methods that manage user keys should probably also be updated to proxy (eth_sendTransaction). I don't think that this is a super high priority as its unlikely many people will use it, but it would better match people's expectations on how upstream works.

[tynes]

Good work! Will approve once the integration test is added :)

[tuxcanfly]

Thanks, added the integration test.