docs: Improve ctx.Locals method documentation

[sixcolors]

Description

Improve the ctx.Locals inlone godocs to clarify the behavior of stored variables and their lifecycle to avoid unintentional resource closures. Following #3030 this adds inline docs to ctx.go file.

Changes Introduced

• Documentation Update:
  • Added a clarification that stored variables are removed after the request is handled.
  • Specified that if any stored data implements the io.Closer interface, its Close method will be called before it's removed.

Details

• File Modified: ctx.go
• Benchmark Impact: None
• Documentation Updates: Improved clarity in the Locals method documentation.
• Changelog Entries:
  • Clarified behavior of ctx.Locals regarding variable removal and io.Closer interface handling.
• Migration Guide: Not applicable

These changes aim to prevent issues with unintentional resource closures, such as database connections, and enhance the clarity and safety of using ctx.Locals in fiber.

[coderabbitai]

Walkthrough

The changes involve updating the comment for the Locals method in the Ctx struct within the ctx.go file. This comment now clarifies that all values are removed from the context after the top RequestHandler returns, and any value implementing io.Closer will have its Close method called before removal.

Changes

File	Change Summary
ctx.go	Updated the comment for the Locals method to explain the behavior of values in the context.

Poem

In the code where contexts dwell,
New comments now do tell,
Of values cleared with care so fine,
Each Closer calls its line.
In Ctx they come and go,
Like gentle streams they flow,
A tidy world, in code they shine.

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[coderabbitai]

Actionable comments posted: 0

Outside diff range and nitpick comments (2)

ctx.go (2)

Line range hint 26-26: The imports github.com/gofiber/fiber/v2/internal/schema and github.com/gofiber/fiber/v2/utils are flagged by depguard as not allowed. Please verify if these imports are essential for the functionality, and if so, consider updating the depguard configuration to allow them.

Also applies to: 27-27

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Line range hint 776-776: The variable i is assigned but then immediately reassigned without being used. This could lead to inefficient code. Consider removing or using the variable appropriately to avoid confusion and potential bugs.

- i, j = j+1, j+2
+ j += 2

Also applies to: 826-826

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 6c9510d and f7164c6.

Files selected for processing (1)

• ctx.go (1 hunks)

Additional context used

golangci-lint

ctx.go

26-26: import 'github.com/gofiber/fiber/v2/internal/schema' is not allowed from list 'Main' (depguard)

---

27-27: import 'github.com/gofiber/fiber/v2/utils' is not allowed from list 'Main' (depguard)

---

776-776: assigned to i, but reassigned without using the value (wastedassign)

---

826-826: assigned to i, but reassigned without using the value (wastedassign)

Additional comments not posted (1)

ctx.go (1)

970-973: The updated documentation clearly explains the lifecycle of stored variables in the context and their handling via the io.Closer interface. This enhancement will help developers understand the behavior of the Locals method better, especially regarding resource management.