♻️ refactor: Return fast from parseToStruct() when data is empty

[billyplus]

Description

"parseToStruct" return fast when data is empty

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Walkthrough

The changes introduce early return conditions in the ParamsParser and parseToStruct methods of the ctx.go file. In ParamsParser, the function immediately returns nil when there are no route parameters, while in parseToStruct, it returns nil if the provided data map is empty. Additionally, the initialization of the parameters map now uses the actual length of c.route.Params, optimizing the control flow and reducing unnecessary processing.

Changes

File	Change Summary
ctx.go	Added early return in ParamsParser if c.route.Params is empty; initialized parameters map based on actual count; early return in parseToStruct if data is empty

Sequence Diagram(s)

sequenceDiagram
    participant C as Caller
    participant P as ParamsParser
    C->>P: Call ParamsParser()
    alt Route parameters length is 0
        P-->>C: Return nil immediately
    else
        P->>P: Initialize params map with length of c.route.Params
        P-->>C: Continue processing parameters
    end

sequenceDiagram
    participant C as Caller
    participant P as parseToStruct
    C->>P: Call parseToStruct(data)
    alt Data map is empty
        P-->>C: Return nil immediately
    else
        P->>P: Decode data into structure
        P-->>C: Return processed structure
    end

Suggested labels

v3

Suggested reviewers

• gaby

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📥 Commits

Reviewing files that changed from the base of the PR and between ac8b1c95c3af9424bafcaa3b7e94cacc25018c41 and 00bdefb7ca405c9478034d0fe65e4c97619fa957.

📒 Files selected for processing (1)

• ctx.go (2 hunks)

🔇 Additional comments (2)

ctx.go (2)

1085-1090: Optimize ParamsParser with early exit and pre-sized map
Using len(c.route.Params) once improves readability, and pre-sizing the map with capacity l avoids unnecessary reallocations. Early returning nil when there are no route parameters is correct, as there’s nothing to bind.

---

1317-1320: Add fast return in parseToStruct for empty data
Guarding parseToStruct against empty data prevents acquiring and returning a decoder when there’s nothing to decode. Using len(data) == 0 covers both nil and empty maps.

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[gaby]

@billyplus @ReneWerner87 Do we need this change in v3? The PR is for v2

[billyplus]

thanks for the work unfortunately the customization breaks the current functionality

you could think the fast return with no values should not break anything, but there is a case where you have a required field in the struct itself so the schema parser must always be executed, even if there is no data

https://github.com/billyplus/fiber/blob/7eb9d255489192343c647f1d910abbb140705474/ctx_test.go#L4661

maybe, split a validator from decoder function could be a better way.