Low Hanging Gas Optimizations

[RnkSngh]

Pr to remove the unused ackpacket commitment mapping from dispatcher.

This mapping was originally included for async acks, but adds gas cost of an SLOAD, so we've decided to get rid of it for now

Note: The writeAckPacket event is still emitted, so peptide integration should be unimpacted

Summary by CodeRabbit

• New Features

  • Streamlined packet acknowledgment process for improved efficiency.
  • Introduced a new variable for enhanced clarity in channel ID to connection mapping.

• Bug Fixes

  • Removed unnecessary checks related to acknowledgment commitments, simplifying packet handling.

• Documentation

  • Minor formatting adjustments for improved readability and maintainability.

[coderabbitai]

Walkthrough

The pull request introduces significant modifications to the Dispatcher.sol contract, particularly in its internal logic and state management. The _ackPacketCommitment mapping has been removed, simplifying acknowledgment packet tracking. Corresponding checks in the recvPacket function have also been eliminated, streamlining packet handling. Additionally, a placeholder timeout function indicates ongoing development in timeout management. In the Dispatcher.base.t.sol test file, a new state variable enhances code clarity by replacing a hardcoded value, along with minor formatting adjustments.

Changes

File	Change Summary
contracts/core/Dispatcher.sol	- Removed _ackPacketCommitment mapping. - Removed related checks in recvPacket. - timeout function is a placeholder.
test/utils/Dispatcher.base.t.sol	- Added uint32 CHANNEL_ID_TO_CONNECTION_STARTING_SLOT = 258;. - Replaced hardcoded value 259 in _storeChannelidToConnectionMapping with the new variable. - Minor formatting adjustments.

Possibly related PRs

• Misc Contract Finalizations #154: Modifications to the Dispatcher contract's ownership model and initialization methods.
• Raunak/informal q3 fixes #192: Removal of the _channelIdToConnection mapping in related functions, aligning with acknowledgment handling simplifications.
• Adding skip ack option, wip #204: Introduction of a skipAck option in the Dispatcher contract, related to acknowledgment management changes.

Poem

🐰 In the code where packets flow,
A change was made, a simpler show.
No more tracking, just let it be,
A clearer path for you and me.
With constants bright, the code does gleam,
A rabbit's hop, a coder's dream! ✨

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 9748cb4 and bac7678.

📒 Files selected for processing (2)

• contracts/core/Dispatcher.sol (0 hunks)
• test/utils/Dispatcher.base.t.sol (2 hunks)

💤 Files with no reviewable changes (1)

• contracts/core/Dispatcher.sol

🧰 Additional context used

🔇 Additional comments (3)

test/utils/Dispatcher.base.t.sol (3)

58-58: LGTM: New constant improves code clarity

The addition of CHANNEL_ID_TO_CONNECTION_STARTING_SLOT as a named constant is a good practice. It replaces a magic number with a descriptive variable name, enhancing code readability and maintainability.

---

273-273: LGTM: Consistent use of the new constant

The modification in _storeChannelidToConnectionMapping correctly utilizes the newly added CHANNEL_ID_TO_CONNECTION_STARTING_SLOT constant. This change enhances code consistency and reduces the risk of errors associated with hardcoded values.

---

Line range hint 1-314: Overall assessment: Changes improve code quality

The modifications in this file, while minimal, contribute to better code quality by introducing a named constant and using it consistently. These changes align with good coding practices and likely support the larger goal of removing the ack packet commitment mapping as mentioned in the PR objectives.

However, to ensure completeness:

Let's verify if there are any remaining references to the ack packet commitment mapping in this file:

✅ Verification successful

Let's rerun the search without specifying the file type to check for any remaining references to ackPacketCommitment:

---

Verified: No remaining references to ackPacketCommitment found in test/utils/Dispatcher.base.t.sol.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Search for any remaining references to ack packet commitment
rg --type sol "ackPacketCommitment" test/utils/Dispatcher.base.t.sol

Length of output: 96

---

Script:

#!/bin/bash
# Search for any remaining references to ackPacketCommitment without specifying file type
rg "ackPacketCommitment" test/utils/Dispatcher.base.t.sol

Length of output: 57

---

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