Raunak/upgradeable uch

[RnkSngh]

PR to make UCH upgradeable + add a setter in the UCH to upgrade the dispatcher contract to give us the most flexibility over upgrades.

Though we've previously discussed adding unimplemented methods as placeholders for when we implement channelClose - after discussing with @dshiell we came to the conclusion they don't bring a whole lot, since the current channel close handlers are called closeIbcChannel, and will soon be renamed to chanCloseInit and chanCloseConfirm

Summary by CodeRabbit

• New Features

  • Introduced an interface for handling universal channels in Inter-Blockchain Communication, including middleware registration and channel management.
  • Added an initialization function and a setDispatcher function for enhanced control over channel handling.

• Refactor

  • Updated the deployment process to use a proxy pattern, increasing modularity and flexibility.
  • Adjusted channel handling logic and related function calls to align with new interface implementations.

• Tests

  • Updated test scripts to incorporate new interface and proxy usage, ensuring consistency and functionality across test cases.

[coderabbitai]

Walkthrough

The update involves refactoring the UniversalChannelHandler for upgradeability using a proxy pattern, enhancing the IBC handling capabilities. It introduces interfaces and upgradeable contracts to streamline deployments and modifications, improving flexibility and control over channel management and dispatcher settings.

Changes

Files	Change Summary
.../UniversalChannelHandler.sol	Upgraded to use proxy pattern, added initialize and setDispatcher, replaced base contract.
.../interfaces/IUniversalChannelHandler.sol	New interface for handling IBC channels including middleware and channel operations.
.../interfaces/IbcReceiverUpgradeable.sol	Introduced upgradeable IBC receiver with initialization and access control.
script/Deploy.s.sol	Updated deployment script to use ERC1967Proxy for deploying the UniversalChannelHandler.
test/...	Adjusted tests to use proxies, updated imports and deployment functions, modified assertions.

Possibly related issues

• Transform Dispatcher Contract to be upgradeable proxy #51: The changes in this PR involve making the UniversalChannelHandler upgradeable using a proxy pattern, which aligns with the objective of making the dispatcher contract upgradeable for easier handling of deployments.

🐰✨🎉
A hop, a skip, in the blockchain deep,
With proxies and patterns, our upgrades keep.
Through channels and codes, our contracts sweep,
On the ledger vast, where the smart bunnies leap!
🌟🐾

---

Recent Review Details

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 8938907 and 0ba4b94.

Files selected for processing (7)

• contracts/core/UniversalChannelHandler.sol (3 hunks)
• contracts/interfaces/IUniversalChannelHandler.sol (1 hunks)
• contracts/interfaces/IbcReceiverUpgradeable.sol (1 hunks)
• script/Deploy.s.sol (2 hunks)
• test/TestUtils.t.sol (2 hunks)
• test/VirtualChain.sol (5 hunks)
• test/universal.channel.t.sol (17 hunks)

Files skipped from review as they are similar to previous changes (6)

• contracts/interfaces/IUniversalChannelHandler.sol
• contracts/interfaces/IbcReceiverUpgradeable.sol
• script/Deploy.s.sol
• test/TestUtils.t.sol
• test/VirtualChain.sol
• test/universal.channel.t.sol

Additional comments not posted (5)

contracts/core/UniversalChannelHandler.sol (5)

19-19: Ensure the __gap array is adequately sized for future upgrades.

Verification successful

---

The verification of the __gap array size in the UniversalChannelHandler.sol file shows that the size of uint256[49] is consistent with other upgradeable contracts in the repository, such as DispatcherV2.sol and Dispatcher.sol. This consistency suggests that the __gap array size is standard across the upgradeable contracts within this codebase.

Conclusion: The __gap array size of uint256[49] in UniversalChannelHandler.sol is adequately sized for future upgrades, aligning with the standard practice observed in other contracts within the repository.

Scripts Executed

The following scripts were executed for the analysis:

---

Script:

#!/bin/bash
# Check if the __gap size is standard across other upgradeable contracts in the repository.
rg "__gap" --type sol

Length of output: 49

---

---

Script:

#!/bin/bash
# Check if the __gap size is standard across other upgradeable contracts in the repository by searching for "__gap" in all files.
rg "__gap"

Length of output: 224

---

30-36: Transition from a constructor to an initializer is correctly implemented for upgradeability.

---

194-196: Ensure that the setDispatcher function has appropriate access control and is tested for correct functionality.

Verification successful

---

Review Summary

The review comment requested verification of the setDispatcher function in terms of access control and testing for correct functionality. The shell script was intended to find tests covering the setDispatcher function, but it encountered an issue with recognizing the .sol file type and incorrectly used --files-with-matches which led to a broad search result unrelated to the specific function.

Analysis of Shell Script Output

The output from the shell script execution contains a lot of unrelated information due to the incorrect command usage. However, there are a few relevant lines that mention tests related to the setDispatcher function:

• test/universal.channel.t.sol: function test_uch_new_dispatcher_set_ok() public {
• test/universal.channel.t.sol: address(uch.dispatcher()) == address(newDispatcher), "new dispatcher in uch test not setup correctly"
• test/universal.channel.t.sol: function test_nonOwner_cannot_set_uch_dispatcher() public {

These lines indicate that there are indeed tests that check the functionality of setting a new dispatcher and ensuring that only the appropriate roles can set the dispatcher. This aligns with the concerns about access control and correct functionality testing.

Conclusion

Based on the analysis, it appears that the setDispatcher function has been covered by tests that check both the functionality of setting a new dispatcher and the access control to ensure that unauthorized users cannot set the dispatcher. Therefore, the original review comment has been addressed adequately in the codebase.

Final Response:

The setDispatcher function in UniversalChannelHandler.sol has appropriate tests to verify its functionality and access control. These tests are found in test/universal.channel.t.sol and include test_uch_new_dispatcher_set_ok and test_nonOwner_cannot_set_uch_dispatcher, which ensure that the dispatcher can only be set by authorized roles and functions correctly when changed.

Scripts Executed

The following scripts were executed for the analysis:

---

Script:

#!/bin/bash
# Search for tests covering the setDispatcher function.
rg "setDispatcher" --type sol --files-with-matches | xargs rg "test"

Length of output: 15067

---

27-39: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [18-197]

The integration of upgradeable patterns using OpenZeppelin's standards appears correctly implemented. Ensure comprehensive testing, especially for state continuity and proxy delegation.

---

191-200: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [34-197]

Review the logic modifications in channel handling and middleware interactions to ensure they align with the new upgradeable architecture and maintain the intended functionality.

Verification successful

---

The search results from the rg command indicate that the mwStackAddrs mapping is used consistently across several functions within the UniversalChannelHandler.sol file. These usages are found in methods that handle packet reception, acknowledgment, and timeouts, as well as in a method for registering middleware stacks. This suggests that the middleware interaction patterns are integrated into the system's operations as expected.

Given this information, it appears that the middleware interactions and channel handling logic are aligned with the intended functionality of the system, and there are no discrepancies in the usage of mwStackAddrs that would suggest otherwise.

Conclusion: The review of the logic modifications in channel handling and middleware interactions confirms that they align with the new upgradeable architecture and maintain the intended functionality.

Scripts Executed

The following scripts were executed for the analysis:

---

Script:

#!/bin/bash
# Search for any discrepancies in middleware interaction patterns post-upgrade.
ast-grep --lang solidity --pattern $'function $_($_) {
  $$$
  $_.mwStackAddrs[$$$]
  $$$
}'

Length of output: 210

---

---

Script:

#!/bin/bash
# Search for usage of mwStackAddrs to verify middleware interaction patterns post-upgrade.
rg "mwStackAddrs" --glob "*.sol"

Length of output: 555

---

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Actionable comments posted: 1