refactor(contracts-rfq): emit events before external calls, more explicit docs [SLT-342]

[ChiTimesChi]

Description
See title.

Summary by CodeRabbit

• New Features

  • Enhanced dispute functionality with stricter conditions for raising disputes.
  • Updated refund logic to clarify processing conditions and timing.
  • Improved claim functionality allowing claims on behalf of proven relayers.
  • New functions added to retrieve bridge statuses, proofs, and relay information.

• Bug Fixes

  • Refined error handling across various functions for better transaction reliability.

[coderabbitai]

Walkthrough

The pull request introduces significant modifications to the FastBridgeV2 contract, focusing on transaction dispute management, refunds, claims, and bridge transaction handling. Key updates include enhanced dispute functionality, clarified refund processes, and refined claim mechanisms. New functions for retrieving bridge statuses and proofs have been added, alongside improved error handling across various functions. These changes aim to bolster the contract's efficiency and clarity in managing transaction states.

Changes

File Path	Change Summary
packages/contracts-rfq/contracts/FastBridgeV2.sol	Updated dispute, refund, claim, and prove functions; added new functions for status retrieval; refined error handling.

Possibly related PRs

• feat(contracts-rfq): relay/prove/claim with different address [SLT-130] #3138: Introduces overloads for the relay, prove, and claim functions in FastBridgeV2, related to handling claims and relays.
• store relayer on relay [SLT-182] #3170: Updates the FastBridgeV2 contract to improve management of bridge relay transactions.
• rearrange refund validation checks [SLT-185] #3172: Modifies refund validation checks in FastBridgeV2, relevant to refund logic changes.
• status/proof mapping packing [SLT-186] #3173: Consolidates status and proof mappings in FastBridgeV2, enhancing transaction handling clarity.
• fix(contracts-rfq): add bridge/relay revert tests [SLT-322] #3251: Adds tests for revert conditions in bridge and relay functions, crucial for robustness.
• fix dispute emit & revamp deposit xfer [SLT-295] [SLT-326] #3293: Revamps dispute and transfer logic in FastBridgeV2, closely related to dispute functionality updates.
• storage refs - readability & gas impv [SLT-353] #3303: Improves readability and gas efficiency in FastBridgeV2 by optimizing access to bridge transaction details.

Suggested labels

size/m, M-docs, Sol

Suggested reviewers

• parodime
• trajan0x

🐰 In the realm of bridges, we hop and play,
With disputes and claims, we clear the way.
Refunds now dance, with logic so bright,
In FastBridgeV2, everything feels right!
So let’s raise a cheer, for changes so grand,
A smoother transaction, just as we planned! 🌟

---

📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 06a7efa and 63b04b1.

📒 Files selected for processing (1)

• packages/contracts-rfq/contracts/FastBridgeV2.sol (4 hunks)

🧰 Additional context used

📓 Learnings (1)

packages/contracts-rfq/contracts/FastBridgeV2.sol (1)

Learnt from: ChiTimesChi
PR: synapsecns/sanguine#3284
File: packages/contracts-rfq/contracts/FastBridgeV2.sol:100-118
Timestamp: 2024-10-14T14:45:57.214Z
Learning: When reviewing code in `packages/contracts-rfq/contracts/FastBridgeV2.sol` (Solidity), focus on changes introduced in the PR and avoid commenting on existing functions like `refund` if they are not modified by the PR, as such comments are considered out of scope.

🔇 Additional comments (11)

packages/contracts-rfq/contracts/FastBridgeV2.sol (11)

86-90: Good practice: Aggregating storage reads for gas optimization

Aggregating the storage reads into local variables improves gas efficiency by reducing redundant storage accesses.

---

110-113: Ensure correct refund eligibility checks

The logic correctly enforces that refunds can only be processed for transactions with a status of REQUESTED after their deadline expires.

---

113-116: Permissionless refund logic is correctly implemented

The additional REFUND_DELAY for permissionless refunds is properly handled based on the caller's role.

---

124-126: Best practice: Emitting events before external calls

Emitting the BridgeDepositRefunded event before any external calls enhances security by minimizing the risk of reentrancy attacks.

---

292-294: Appropriate status check before proving a transaction

The check ensures that only transactions with status REQUESTED can be proved, maintaining the correct state transitions.

---

309-318: Good practice: Aggregating storage reads and enforcing claim conditions

Aggregating storage reads improves gas efficiency, and the checks correctly enforce that a transaction can only be claimed after the dispute period has passed.

---

321-324: Clarification on claim recipient logic

The logic allows anyone to claim the funds on behalf of the proven relayer if to is zero, ensuring flexibility while maintaining security checks.

---

334-339: Best practice: Emitting events before external calls

Emitting the BridgeDepositClaimed event before external calls enhances security by reducing potential reentrancy risks.

---

347-349: Addition of bridgeStatuses function enhances transparency

Providing a public view function to retrieve the bridge status of transactions improves the contract's usability for external parties.

---

Line range hint 352-356: Addition of bridgeProofs function allows retrieval of proof details

Exposing proof timestamps and relayer addresses can be useful for auditors and users to verify transaction proofs.

---

Line range hint 358-360: Addition of bridgeRelays function to check relay status

This function enhances the ability to verify whether a transaction has been relayed.

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.74454%. Comparing base (6415acd) to head (63b04b1).
Report is 21 commits behind head on master.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3316         +/-   ##
===================================================
- Coverage   31.92469%   28.74454%   -3.18015%     
===================================================
  Files            238         184         -54     
  Lines          14553       12131       -2422     
  Branches         356          82        -274     
===================================================
- Hits            4646        3487       -1159     
+ Misses          9614        8361       -1253     
+ Partials         293         283         -10     

Flag	Coverage Δ
packages	90.44834% <ø> (ø)
promexporter	?
solidity	98.65772% <100.00000%> (+3.13638%)	⬆️

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[parodime]

lgtm just a phrasing nit