[ISSUE #4025]Introduce ChannelId type alias for improved clarity in channel struct

[mxsm]

Which Issue(s) This PR Fixes(Closes)

Fixes #4025

Brief Description

How Did You Test This Change?

Summary by CodeRabbit

• New Features

  • Channels now auto-generate unique identifiers on creation, improving traceability and diagnostics.
  • Added an API to update a channel’s identifier when needed.

• Refactor

  • Standardized the channel identifier type across the module for consistency and clearer semantics.

[coderabbitai]

Walkthrough

Introduces a ChannelId type alias, updates Channel struct’s channel_id field to use it, adds a Channel::new constructor that assigns a UUID string to channel_id, and adds a setter method to update channel_id. The existing channel_id accessor continues returning &str.

Changes

Cohort / File(s)	Summary
Channel ID alias and constructor updates rocketmq-remoting/src/net/channel.rs	Added pub type ChannelId = CheetahString; updated Channel.channel_id to ChannelId; added Channel::new(...) that initializes channel_id with Uuid::new_v4().to_string(); added Channel::set_channel_id(...); kept channel_id() accessor returning &str.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant Channel
  participant UUID as UUID Generator

  Caller->>Channel: Channel::new(inner, local_addr, remote_addr)
  activate Channel
  Channel->>UUID: new_v4()
  UUID-->>Channel: uuid
  Channel->>Channel: channel_id = uuid.to_string()
  Channel-->>Caller: Channel { channel_id, ... }
  deactivate Channel

  Note over Caller,Channel: Setter path
  Caller->>Channel: set_channel_id(value)
  Channel->>Channel: channel_id = value.into()

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Pre-merge checks (5 passed)

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The PR title "[ISSUE #4025]Introduce ChannelId type alias for improved clarity in channel struct" succinctly and accurately describes the primary change (adding a ChannelId alias and updating the channel struct) and matches the changes shown in channel.rs; it is specific, readable, and not vague.
Linked Issues Check	✅ Passed	The diff introduces pub type ChannelId = CheetahString, updates Channel.channel_id to use ChannelId, and adds related constructor and setter, which directly implements the single stated objective in linked issue #4025 to introduce a ChannelId alias for clarity; the linked issue included no additional coding requirements.
Out of Scope Changes Check	✅ Passed	All modifications are confined to rocketmq-remoting/src/net/channel.rs and relate to introducing the ChannelId alias and supporting API (field type change, constructor, setter); there are no changes to unrelated files or subsystems that would indicate out-of-scope work.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

Poem

In burrows of code where channels abide,
I nibble an ID with UUID pride.
A fresh alias blooms, crisp as the dawn,
Setters hop in, and the old getter’s on.
Ears perked high—I thump with delight,
Channel by channel, the names feel right. 🐇✨

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch enh-4025

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[rocketmq-rust-bot]

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[Copilot]

Pull Request Overview

This PR introduces a ChannelId type alias to improve code clarity and maintainability in the channel module by replacing direct usage of CheetahString for channel identifiers.

• Introduces ChannelId as a type alias for CheetahString
• Updates the Channel struct to use the new ChannelId type for the channel_id field

Comments suppressed due to low confidence (1)

rocketmq-remoting/src/net/channel.rs:1

• The set_channel_id method parameter should use ChannelId or impl Into<ChannelId> instead of impl Into<CheetahString> for consistency with the new type alias.

/*

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.57%. Comparing base (95022d6) to head (a4b4d14).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4026   +/-   ##
=======================================
  Coverage   26.57%   26.57%           
=======================================
  Files         565      565           
  Lines       80722    80722           
=======================================
  Hits        21453    21453           
  Misses      59269    59269           

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[rocketmq-rust-bot]

LGTM

[coderabbitai]

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

rocketmq-remoting/src/net/channel.rs (1)

73-76: Avoid mutating fields that participate in Eq/Hash (can corrupt HashMap/HashSet invariants).

Channel implements Eq/Hash using channel_id (and addresses). Exposing set_channel_id means a Channel used as a key in hashed collections can be mutated, breaking lookups. Restrict visibility and add a warning; also accept Into<ChannelId> to avoid leaking the underlying alias.

Apply:

-    #[inline]
-    pub fn set_channel_id(&mut self, channel_id: impl Into<CheetahString>) {
-        self.channel_id = channel_id.into();
-    }
+    #[inline]
+    /// Sets the channel ID.
+    ///
+    /// WARNING: Mutating `channel_id` after inserting `Channel` into hashed collections
+    /// (HashMap/HashSet) will corrupt collection invariants. Prefer setting only during init.
+    pub(crate) fn set_channel_id(&mut self, channel_id: impl Into<ChannelId>) {
+        self.channel_id = channel_id.into();
+    }

Also consider similarly restricting set_local_address and set_remote_address for the same reason.

Also applies to: 99-115

🧹 Nitpick comments (2)

rocketmq-remoting/src/net/channel.rs (2)

38-39: Tiny doc nit: annotate the alias to convey intent.

- pub type ChannelId = CheetahString;
+ /// Logical identifier for a Channel (alias for `CheetahString`).
+ pub type ChannelId = CheetahString;

---

49-61: uuid present in workspace; consider scoping Channel::new

• Root/workspace Cargo.toml includes uuid with the "v4" feature and rocketmq-remoting uses uuid = { workspace = true }, so Uuid::new_v4() is supported.
• If Channel::new is not intended as part of the public API, change pub fn new(...) -> Self to pub(crate) fn new(...) -> Self in rocketmq-remoting/src/net/channel.rs (lines ~49–61).

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📥 Commits

Reviewing files that changed from the base of the PR and between 95022d6 and a4b4d14.

📒 Files selected for processing (1)

• rocketmq-remoting/src/net/channel.rs (1 hunks)

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🔇 Additional comments (2)

rocketmq-remoting/src/net/channel.rs (2)

45-46: Field type swap to ChannelId improves readability. LGTM.

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88-91: Accessor returning &str keeps callers decoupled from the alias. LGTM.