[ISSUE #5423]🚀Add an EmptyEvaluationContext struct based on Java code #5452
Conversation
rocketmq-rust-bot
requested review from
SpaceXCN,
TeslaRustor and
rocketmq-rust-bot
|
🔊@leonprietobailo 🚀Thanks for your contribution🎉！ 💡CodeRabbit(AI) will review your code first🔥！ Note 🚨The code review suggestions from CodeRabbit are to be used as a reference only, and the PR submitter can decide whether to make changes based on their own judgment. Ultimately, the project management personnel will conduct the final code review💥. |
rocketmq-rust-bot
added
AI review first
rocketmq-rust-robot
added
Difficulty level/Easy
WalkthroughThis PR introduces a new Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing touches
Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
There was a problem hiding this comment.
Actionable comments posted: 1
🧹 Nitpick comments (1)
rocketmq-filter/src/expression/empty_evaluation_context.rs (1)
5-5: Consider adding documentation and deriving standard traits.The struct definition is minimal and functional. However, since this is a public API, consider:
- Adding documentation explaining this is a no-op evaluation context
- Deriving common traits like
Debug,Clone,Copy, andDefaultfor better ergonomics🔎 Suggested enhancement
+/// An empty evaluation context that returns `None` for all operations. +/// +/// This serves as a no-op implementation of `EvaluationContext` to be used +/// when no context data is available. +#[derive(Debug, Clone, Copy, Default)] pub struct EmptyEvaluationContext;
📜 Review details
Configuration used: Path: .coderabbit.yaml
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (2)
rocketmq-filter/src/expression.rsrocketmq-filter/src/expression/empty_evaluation_context.rs
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (5)
- GitHub Check: Build & Test (ubuntu-latest)
- GitHub Check: Code Coverage
- GitHub Check: Build & Test (macos-latest)
- GitHub Check: Build & Test (windows-latest)
- GitHub Check: auto-approve
🔇 Additional comments (1)
rocketmq-filter/src/expression.rs (1)
17-17: LGTM! Module integration follows existing patterns.The module declaration and re-export are correctly structured and consistent with the existing code organization in this file.
Also applies to: 31-31
| impl EvaluationContext for EmptyEvaluationContext { | ||
| fn get(&self, _name: &str) -> Option<&CheetahString> { | ||
| None | ||
| } | ||
|
|
||
| fn key_values(&self) -> Option<HashMap<CheetahString, CheetahString>> { | ||
| None | ||
| } | ||
| } |
There was a problem hiding this comment.
🧩 Analysis chain
🏁 Script executed:
# First, let's look at the full file and the EvaluationContext trait definition
find . -name "*.rs" -type f | head -20Repository: mxsm/rocketmq-rust
Length of output: 1209
🏁 Script executed:
# Search for the EvaluationContext trait definition
rg "trait EvaluationContext" -A 10Repository: mxsm/rocketmq-rust
Length of output: 978
🏁 Script executed:
# Get the full empty_evaluation_context.rs file
cat -n rocketmq-filter/src/expression/empty_evaluation_context.rsRepository: mxsm/rocketmq-rust
Length of output: 539
🌐 Web query:
RocketMQ Java EmptyEvaluationContext filter expression implementation
💡 Result:
Short answer — what it is and the implementation
EmptyEvaluationContext is the minimal EvaluationContext used by RocketMQ’s SQL/Expression filter code when no properties/variables are provided. Its implementation just returns null for lookups and an empty map for key-values.
Typical implementation (equivalent to RocketMQ):
public final class EmptyEvaluationContext implements EvaluationContext {
public static final EmptyEvaluationContext INSTANCE = new EmptyEvaluationContext();
private EmptyEvaluationContext() {}
@OverRide
public Object get(String name) { return null; }
@OverRide
public Map<String, Object> keyValues() { return Collections.emptyMap(); }
}
Sources showing the class exists and how it’s used in tests/docs. [1][2]
References
- File listing showing EmptyEvaluationContext in RocketMQ filter package. [1]
- Blog/test excerpts demonstrating use of EmptyEvaluationContext in expression evaluation. [2]
[1] cve.imfht.com snapshot of RocketMQ filter module (lists EmptyEvaluationContext.java).
[2] cnblogs post showing Expression tests and usage of EmptyEvaluationContext.
🏁 Script executed:
# Get the full EvaluationContext trait definition
cat -n rocketmq-filter/src/expression/evaluation_context.rsRepository: mxsm/rocketmq-rust
Length of output: 23073
🏁 Script executed:
# Also search for any other EvaluationContext implementations to see pattern
rg "impl EvaluationContext" -B 2 -A 15Repository: mxsm/rocketmq-rust
Length of output: 2406
Implementation matches Rust trait contract, but differs from Java semantics for key_values() method.
The Rust implementation correctly adheres to the EvaluationContext trait, which permits returning None from key_values() for contexts with no variables. However, the equivalent Java implementation returns Collections.emptyMap() instead of null. The MessageEvaluationContext implementation in the same codebase always returns Some(HashMap) even when empty, suggesting a preference to return an empty map rather than None. For closer semantic alignment with the Java source, consider returning Some(HashMap::new()) instead of None for key_values().
🤖 Prompt for AI Agents
In rocketmq-filter/src/expression/empty_evaluation_context.rs around lines 7 to
15, key_values() currently returns None which diverges from the Java equivalent
and the project's MessageEvaluationContext that return empty maps; change the
implementation to return Some(HashMap::new()) so the method always returns a map
(possibly empty) instead of None, ensuring consistency with other contexts and
Java semantics.
There was a problem hiding this comment.
That's not correct, the equivalent Java class does in fact return "null".
There was a problem hiding this comment.
Seems like the humans are having a chat. I'll hop back into my burrow for now. If you need me again, just tag @coderabbitai in a new comment, and I'll come hopping out!
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #5452 +/- ##
==========================================
- Coverage 37.83% 37.83% -0.01%
==========================================
Files 811 812 +1
Lines 109903 109909 +6
==========================================
Hits 41582 41582
- Misses 68321 68327 +6 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
|
rocketmq-rust-bot
left a comment
rocketmq-rust-bot
left a comment
There was a problem hiding this comment.
LGTM - All CI checks passed ✅
rocketmq-rust-bot
added
approved
4 participants
Which Issue(s) This PR Fixes(Closes)
Fixes #5423
Brief Description
N/A
How Did You Test This Change?
N/A
Summary by CodeRabbit
✏️ Tip: You can customize this high-level summary in your review settings.