[ISSUE #3450]⚡️Implement From trait for LanguageCode to enhance type conversions✨ #3451
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""" WalkthroughThe changes add multiple Changes
Sequence Diagram(s)sequenceDiagram
participant Caller
participant LanguageCode
Caller->>LanguageCode: Convert (u8/i32/u32) to LanguageCode (From trait)
LanguageCode-->>Caller: Returns matching variant or OTHER
Caller->>LanguageCode: Convert LanguageCode to u8/i32 (From trait)
LanguageCode-->>Caller: Returns code value
Caller->>LanguageCode: value_of(code)
LanguageCode-->>Caller: Returns Some(variant) or Some(OTHER)
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Pull Request Overview
This PR enhances the type conversion capabilities for LanguageCode by implementing several From trait conversions and updating the fallback behavior for unknown codes.
- Added From implementations to convert LanguageCode to u8 and i32.
- Introduced conversions from u32, i32, and u8 to LanguageCode that default to OTHER for unrecognized values.
Comments suppressed due to low confidence (2)
rocketmq-remoting/src/protocol.rs:171
- Returning a default LanguageCode::OTHER for all unrecognized codes could potentially mask invalid input values. Consider documenting this behavior or using a fallible conversion (e.g., implementing TryFrom) for clearer error handling.
_ => Some(LanguageCode::OTHER),
rocketmq-remoting/src/protocol.rs:139
- Casting larger integer types to u8 may lead to unintended truncation if the input value exceeds the u8 range. Please ensure that the code values are within the expected bounds or handle out-of-range values explicitly.
LanguageCode::value_of(code as u8).unwrap_or(LanguageCode::OTHER)
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Actionable comments posted: 1
🧹 Nitpick comments (2)
rocketmq-remoting/src/protocol.rs (2)
149-153:unwrap_oris now redundantSince
value_of(see lines 155-173) always returnsSome,unwrap_or(LanguageCode::OTHER)is dead code.
Either:
- Keep
Optioninvalue_of→ revert the fallback toNonefor unknown codes; or- Make
value_ofreturnLanguageCodedirectly and drop theOption.Consistency will simplify callers and avoid the double fallback.
155-173:value_ofnever returnsNone– reconsider signatureWith the default arm changed to
_ => Some(LanguageCode::OTHER),
value_ofcan no longer fail, so its return type need not beOption<Self>.
Changing the signature topub fn value_of(code: u8) -> Selfremoves needlessunwraps and conveys intent more clearly.If you do keep the
Option, returningNonefor unknown values is still preferable in many APIs, letting callers decide on the fallback. Decide on one contract and stick with it.
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🔇 Additional comments (1)
rocketmq-remoting/src/protocol.rs (1)
125-136:From<LanguageCode>impls look goodMapping the enum back to its discriminant via
get_code()is straightforward and zero-cost. Nothing to change here.
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## main #3451 +/- ##
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- Coverage 25.84% 25.84% -0.01%
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Which Issue(s) This PR Fixes(Closes)
Fixes #3450
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