contracts-bedrock: improve CrossL2Inbox devex
#11322
Merged
+202
−52
Commits on Aug 7, 2024
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contracts-bedrock: improve
CrossL2InboxdevexImprove the `CrossL2Inbox` devex by creating an alternative entrypoint. This design was not considered previously because there was a "top level call" restriction, aka the "only EOA" invariant. This was to allow for static analysis of transactions, keeping resource usage lower for validating transactions when building blocks or at the mempool layer. Since 3074/7702 render the enforcement of only eoa impossible, we decided to op/acc and lean into the approach of allowing subcalls to trigger `ExecutingMessage` events. This new interface allows another contract to be the entrypoint, the idea is that the user sends the `Identifier` and the serialized log (message) to whatever contract that they want and then pass it to `CrossL2Inbox.validateMessage` which then emits the event that consensus validates. This allows the calling smart contract to be aware of the schema for the log and deserialize it however they see fit. Since the serialized logs are done with the following algorithm: ```go msg := make([]byte, 0) for _, topic := range log.Topics { msg = append(msg, topic.Bytes()...) } msg = append(msg, log.Data...) ``` It is very easy to use `abi.decode` to decode a log, given that solidity was used to `emit` it. The topics are `bytes32` and then the data is abi encoded given the schema of the event itself. Unused parts like `topic[0]` (hash of the event name) can be dropped when decoding if they are not required. -
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