🐛 fix: Nil pointer dereference with Must Bind binding #3171
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if err is nil err.Error() panics (eg. c.Bind().Must().JSON(...) successfully binds but panics
ItsMeSamey
requested review from
gaby,
sixcolors,
ReneWerner87 and
efectn
and removed request for
a team
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Thanks for opening this pull request! 🎉 Please check out our contributing guidelines. If you need help or want to chat with us, join us on Discord https://gofiber.io/discord |
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ItsMeSamey
changed the title
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@ItsMeSamey Anyway we could trigger this in a new unit-test? |
gaby
changed the title
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3171 +/- ##
==========================================
- Coverage 82.80% 82.72% -0.08%
==========================================
Files 114 114
Lines 11163 11163
==========================================
- Hits 9243 9235 -8
- Misses 1521 1527 +6
- Partials 399 401 +2
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. 🚨 Try these New Features:
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make sure returnErr works with nil error
as in majority of cases we expect err to be nil, this should provide better short-cutting
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@gaby I've added a test for this |
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (1)
bind_test.go (1)
22-29: Approve the new test function with a suggestion.The new
Test_returnErrfunction is a good addition to test the fix for the nil pointer dereference issue. It correctly checks that no error is returned when a nil error is passed toreturnErr.To make the test more robust, consider adding an additional assertion to check the response status code:
err := c.Bind().Must().returnErr(nil) require.Equal(t, nil, err) +require.Equal(t, 200, c.Response().StatusCode())This will ensure that not only is no error returned, but also that the response status remains unchanged when a nil error is passed.
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- bind.go (1 hunks)
- bind_test.go (1 hunks)
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🔇 Additional comments (2)
bind_test.go (1)
Line range hint
1-1183: Overall approval of the test file.The
bind_test.gofile appears to be well-structured and comprehensive, covering various binding scenarios including Query, Header, Body, URI, and Cookie bindings. The addition of theTest_returnErrfunction complements the existing test suite by addressing the specific issue mentioned in the PR.The file also includes benchmark functions, which are valuable for monitoring performance. No significant issues or necessary improvements are identified in the rest of the file.
bind.go (1)
44-45: Properly handling nil errors to prevent nil pointer dereferenceThe updated condition
if err == nil || b.shouldensures that the function returns early whenerrisnilorb.shouldistrue, preventing a nil pointer dereference when callingerr.Error()later in the code. This change effectively fixes the panic issue described in the pull request.
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@gaby |
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🧹 Outside diff range and nitpick comments (1)
bind.go (1)
43-43: Update documentation for Custom bindingThe comment "NOTE: Should/Must is still valid for Custom binders" above the
Custommethod is now outdated sinceShould/Mustmethods have been removed.Remove or update the comment to reflect the new error handling approach.
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- bind.go (11 hunks)
- bind_test.go (0 hunks)
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- bind_test.go
- ctx.go
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🔇 Additional comments (3)
bind.go (3)
52-52: LGTM: Consistent error handling pattern across all binding methodsThe binding methods now follow a consistent and clean pattern:
- Call the appropriate binder
- Return any binding errors directly
- Validate the struct if binding succeeds
This simplification makes the error handling more predictable and allows users to handle status codes according to their needs.
Also applies to: 61-61, 71-71, 80-80, 89-89, 98-98, 107-107, 116-116, 125-125
147-147: LGTM: Clean error handling in Body bindingThe Body binding method maintains a clean separation of concerns while consistently handling errors from custom binders. The direct error return aligns with the new error handling pattern.
22-22: Breaking Change: Removal of Must/Should chaining capabilityThe removal of the
shouldfield from theBindstruct is a breaking change that will affect existing code using theMust()/Should()chaining pattern. This change is necessary to fix the nil pointer dereference issue, but requires careful migration planning.Consider documenting the migration path for users in the changelog, suggesting alternative error handling patterns such as:
if err := c.Bind().JSON(&data); err != nil { return err }
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we will discuss this again internally and then let you know which way we want to go, thank you for your work and help |
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here the last statement we want to rename the feature so that there is no confusion with the golang concept of MUST for panics because the methods always return an error |
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give us a little time, we are currently discussing what this could look like |
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@ItsMeSamey sorry for the wait we have decided to change the by default no errors should be added to the response, only if someone calls this additional method can you integrate this into your PR ? and extend/customize the markdown btw benchmark error is a false positive because of the same named benchmarks |
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🧹 Outside diff range and nitpick comments (5)
binder/README.md (2)
86-88: LGTM! Consider enhancing the description.The section title change from "Must" to "WithAutoHandling" better reflects the method's purpose. However, the description could be more explicit about what "handle it automatically" means.
Consider this revision for clarity:
-Normally, Fiber returns binder error directly. However; if you want to handle it automatically, you can prefer `WithAutoHandling()`. +Normally, Fiber returns binder errors directly to your handler. However, if you want Fiber to automatically set a 400 status code and return the error message to the client, you can use `WithAutoHandling()`.
102-102: LGTM! Consider enhancing the example.The code example correctly demonstrates the new
WithAutoHandling()method.Consider adding another example showing successful binding to better illustrate the difference:
// Success case: // curl -X GET -H "Content-Type: application/json" --data "{\"name\":\"john\",\"pass\":\"doe\"}" localhost:3000 // Error case (as shown): // curl -X GET -H "Content-Type: application/json" --data "{\"pass\":\"doe\"}" localhost:3000docs/api/bind.md (2)
442-448: Enhance the WithAutoHandling documentationThe documentation for
WithAutoHandlingcould be more comprehensive. Consider adding:
- A clear example showing both success and error scenarios
- Clarification of what happens when binding succeeds
- Comparison with the
Shouldmethod to help users choose between themHere's a suggested enhancement:
### WithAutoHandling -If you want to handle binder errors automatically, you can use WithAutoHandling. -If there's an error it'll return error and 400 as HTTP status. +If you want to handle binder errors automatically, you can use WithAutoHandling. +If there's an error, it'll return the error and set 400 as the HTTP status. +On success, it continues with the normal flow. + +```go title="Example" +app.Post("/", func(c fiber.Ctx) error { + p := new(Person) + + // Automatically returns 400 on binding errors + if err := c.Bind().WithAutoHandling().JSON(p); err != nil { + return err // Error is already handled + } + + return c.JSON(p) // Success case +}) +``` ```go title="Signature" func (b *Bind) WithAutoHandling() *Bind<details> <summary>🧰 Tools</summary> <details> <summary>🪛 LanguageTool</summary> [uncategorized] ~445-~445: A comma might be missing here. Context: ...can use WithAutoHandling. If there's an error it'll return error and 400 as HTTP stat... (AI_EN_LECTOR_MISSING_PUNCTUATION_COMMA) </details> </details> --- `445-445`: **Fix grammar: Add missing comma** Add a comma after the conditional clause for better readability. ```diff -If there's an error it'll return error and 400 as HTTP status. +If there's an error, it'll return error and 400 as HTTP status.🧰 Tools
🪛 LanguageTool
[uncategorized] ~445-~445: A comma might be missing here.
Context: ...can use WithAutoHandling. If there's an error it'll return error and 400 as HTTP stat...(AI_EN_LECTOR_MISSING_PUNCTUATION_COMMA)
bind_test.go (1)
Line range hint
1628-1641: Consider adding more test cases for comprehensive coverage.While the test effectively verifies error handling with
WithAutoHandling, consider adding test cases for:
- Successful binding scenarios
- Different types of binding errors
- Edge cases with empty or invalid data
This would ensure the new
WithAutoHandlingfunctionality is thoroughly tested.Example additional test case:
func Test_Bind_WithAutoHandling(t *testing.T) { app := New() c := app.AcquireCtx(&fasthttp.RequestCtx{}) type RequiredQuery struct { Name string `query:"name,required"` } rq := new(RequiredQuery) + + // Test successful binding + c.Request().URI().SetQueryString("name=john") + err := c.Bind().WithAutoHandling().Query(rq) + require.NoError(t, err) + require.Equal(t, "john", rq.Name) + require.Equal(t, StatusOK, c.Response().StatusCode()) + + // Test error case c.Request().URI().SetQueryString("") err := c.Bind().WithAutoHandling().Query(rq) require.Equal(t, StatusBadRequest, c.Response().StatusCode()) require.Equal(t, "Bad request: bind: name is empty", err.Error()) }
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bind.go(3 hunks)bind_test.go(3 hunks)binder/README.md(2 hunks)docs/api/bind.md(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- bind.go
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docs/api/bind.md
[uncategorized] ~445-~445: A comma might be missing here.
Context: ...can use WithAutoHandling. If there's an error it'll return error and 400 as HTTP stat...
(AI_EN_LECTOR_MISSING_PUNCTUATION_COMMA)
🔇 Additional comments (1)
bind_test.go (1)
22-29: Well-structured test for nil error handling!
This test effectively verifies that the returnErr method handles nil errors correctly, addressing the nil pointer dereference issue mentioned in the PR objectives.
bind.go
Outdated
| @@ -31,22 +31,22 @@ func (b *Bind) Should() *Bind { | |||
| return b | |||
| } | |||
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| // Must If you want to handle binder errors automatically, you can use Must. | |||
| // If you want to handle binder errors automatically, you can use WithAutoHandling. | |||
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Maybe we can rename Should to WithoutAutoHandling()
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What do you think @gaby @ReneWerner87
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (1)
docs/api/bind.md (1)
461-467: Enhance the WithAutoHandling documentationThe documentation for the
WithAutoHandlingmethod could be improved by:
- Adding a code example demonstrating its practical usage
- Explaining when to use this method vs.
Should- Clarifying the specific error scenarios it handles
Consider adding this example:
+```go title="Example" +app.Post("/", func(c fiber.Ctx) error { + p := new(Person) + + // WithAutoHandling will automatically return 400 Bad Request on binding errors + return c.Bind().WithAutoHandling().JSON(p) +}) +``` + +The key differences between `WithAutoHandling` and `Should`: +- `WithAutoHandling`: Automatically handles binding errors by returning them with 400 status +- `Should`: Allows manual error handling (default behavior)
Added a requested clarification
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🧹 Outside diff range and nitpick comments (1)
docs/api/bind.md (1)
461-468: Improve clarity and fix grammatical error
- Fix the grammatical error: "therefor" should be "therefore"
- Consider adding more details about error handling behavior
### WithAutoHandling If you want to handle binder errors automatically, you can use `WithAutoHandling`. If there's an error, it will return the error and set HTTP status to `400 Bad Request`. -This function does NOT panic therefor you must still return on error explicitly +This function does NOT panic therefore you must still return on error explicitly. It safely handles +all error cases, including nil errors. ```go title="Signature" func (b *Bind) WithAutoHandling() *Bind🧰 Tools
🪛 LanguageTool
[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...(THEREFORE)
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[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...
(THEREFORE)
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🧹 Outside diff range and nitpick comments (7)
binder/README.md (4)
86-86: Clarify WithAutoHandlingWithStatus in the documentationThe section title mentions "WithAutoHandlingWithStatus", but this method is not explained or demonstrated in the documentation. Consider either:
- Adding documentation for WithAutoHandlingWithStatus, or
- Removing it from the title if it's not yet implemented
Line range hint
88-102: Improve documentation clarity and examplesSeveral improvements could enhance the documentation:
- The example uses GET with a request body, which is not a common RESTful practice. Consider using POST instead:
-app.Get("/", func(c fiber.Ctx) error { +app.Post("/", func(c fiber.Ctx) error {
- Add an explicit example of the error response format:
// Error Response Example: // { // "error": "Bad request: name is empty" // }
- Clarify the automatic error handling behavior:
-If there's an error it'll return error and 400 as HTTP status. +If there's a validation error or binding failure, it automatically sets a 400 HTTP status code and returns an error response.
- Document the nil error handling improvement:
// Note: WithAutoHandling safely handles nil errors during binding, // preventing potential panics in the error handling chain.🧰 Tools
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[uncategorized] ~90-~90: A comma might be missing here.
Context: ...erWithAutoHandling(). If there's an error it'll return error and 400 as HTTP stat...(AI_EN_LECTOR_MISSING_PUNCTUATION_COMMA)
[uncategorized] ~90-~90: The preposition “of” seems more likely in this position.
Context: ...d 400 as HTTP status. Here's an example for it: ```go // Field names should start ...(AI_EN_LECTOR_REPLACEMENT_PREPOSITION)
102-102: Consider adding error handling examplesThe example could be enhanced to show different error scenarios and their handling:
// Example 1: Missing required field c.Bind().WithAutoHandling().JSON(p) // Result: 400 Bad Request - "name is empty" // Example 2: Invalid JSON c.Bind().WithAutoHandling().JSON(p) // Result: 400 Bad Request - "invalid JSON format" // Example 3: Successful binding c.Bind().WithAutoHandling().JSON(p) // Result: Continues execution normally
Documentation needs update: WithAutoHandlingWithStatus method doesn't exist
The documentation in
binder/README.mdmentions "WithAutoHandling/WithAutoHandlingWithStatus" in its heading and content, but the codebase only implementsWithAutoHandling(). The actual implementation shows thatWithAutoHandling()sets the status code to 400 on error, making the separate "WithStatus" variant unnecessary or removed.
- Remove references to "WithAutoHandlingWithStatus" from the documentation heading and content in
binder/README.md- The rest of the documented behavior for
WithAutoHandling()is accurate, including the 400 status code and error handling🔗 Analysis chain
Line range hint
86-102: Verify documentation consistency with implementationLet's ensure the documentation accurately reflects the implemented method names and behaviors.
Let me gather more specific information about the binding implementation.
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#!/bin/bash # Description: Verify method names and signatures in the codebase # Check for old method names to ensure complete migration echo "Checking for any remaining references to old method names..." rg -i "Must\(\)" --type go rg -i "Should\(\)" --type go # Verify new method signatures echo "Verifying new method signatures..." ast-grep --pattern 'func $_(c *Ctx) Bind() *Bind { $$$ }' # Check for any remaining references to WithAutoHandlingWithStatus echo "Checking WithAutoHandlingWithStatus references..." rg -i "WithAutoHandlingWithStatus"Length of output: 553
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#!/bin/bash # Search for WithAutoHandling implementation and usage echo "Checking WithAutoHandling implementation..." rg -A 5 "WithAutoHandling" # Search for binding-related structs and methods echo "Checking Bind struct and methods..." ast-grep --pattern 'type Bind struct { $$$ }' # Look for actual binding implementation echo "Looking for binding implementation..." ast-grep --pattern 'func (b *Bind) JSON($_) error { $$$ }'Length of output: 4003
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[uncategorized] ~90-~90: A comma might be missing here.
Context: ...erWithAutoHandling(). If there's an error it'll return error and 400 as HTTP stat...(AI_EN_LECTOR_MISSING_PUNCTUATION_COMMA)
[uncategorized] ~90-~90: The preposition “of” seems more likely in this position.
Context: ...d 400 as HTTP status. Here's an example for it: ```go // Field names should start ...(AI_EN_LECTOR_REPLACEMENT_PREPOSITION)
bind.go (2)
34-41: Consider enhancing the documentationWhile the rename to
WithAutoHandlingis good, consider making the documentation more explicit about nil error handling to prevent future confusion.- // If you want to handle binder errors automatically, you can use `WithAutoHandling`. - // If there's an error, it will return the error and set HTTP status to `400 Bad Request`. - // You must still return on error explicitly + // WithAutoHandling configures automatic error handling for binding operations. + // When an error occurs: + // 1. Sets HTTP status to 400 Bad Request + // 2. Returns a formatted error message + // When no error occurs (nil error): + // 1. Returns nil without modifying the response + // Note: You must still handle the returned error in your code🧰 Tools
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66-66: Fix typo in documentationThere's a typo in the note: "WithAutoHandling/WithAutoHandling" should be "WithAutoHandling/WithoutAutoHandling".
- // NOTE: WithAutoHandling/WithAutoHandling is still valid for Custom binders. + // NOTE: WithAutoHandling/WithoutAutoHandling is still valid for Custom binders.docs/api/bind.md (1)
465-465: Fix grammar in documentationThere are two grammar issues in this line:
- "therefor" should be "therefore"
- Missing comma before "therefore"
-This function does NOT panic therefor you must still return on error explicitly +This function does NOT panic, therefore you must still return on error explicitly🧰 Tools
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[uncategorized] ~465-~465: Possible missing comma found.
Context: ...00 Bad Request`. This function does NOT panic therefor you must still return on error...(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...(THEREFORE)
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bind.go(3 hunks)binder/README.md(2 hunks)ctx.go(3 hunks)docs/api/bind.md(1 hunks)
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bind.go
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ctx.go
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docs/api/bind.md
[uncategorized] ~465-~465: Possible missing comma found.
Context: ...00 Bad Request`. This function does NOT panic therefor you must still return on error...
(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...
(THEREFORE)
🔇 Additional comments (7)
bind.go (5)
22-23: LGTM! Improved field naming
The rename from should to dontHandle better reflects the actual behavior of the flag and aligns with the new method names.
26-32: LGTM! Clear method naming and documentation
The rename to WithoutAutoHandling makes the behavior more explicit, and the documentation clearly indicates this is the default behavior.
43-46: LGTM! Nil error check fixes the reported issue
The condition err == nil || b.dontHandle correctly handles both nil errors and manual error handling mode.
49-50: Consider previous security feedback about error exposure
The previous review comment about not exposing internal error details to clients is still valid. Consider implementing that suggestion to improve security.
34-41: Verify all usages of renamed methods
Let's verify that all usages of the old method names (Must and Should) have been updated throughout the codebase.
✅ Verification successful
No issues found with method renaming
The codebase shows that WithAutoHandling() is correctly used in tests and there are no references to the old method names (Must and Should). The changes appear to be properly implemented with no remaining references to the old methods.
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#!/bin/bash
# Search for any remaining references to the old method names
echo "Checking for old method names..."
rg -l "\.Must\(\)" --type go
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docs/api/bind.md (2)
461-477: Add information about error handling improvements
The documentation should address the nil pointer dereference fix that motivated this change.
Add this explanation:
If you want to handle binder errors automatically, you can use `WithAutoHandling`.
-If there's an error, it will return the error and set HTTP status to `400 Bad Request`.
+If there's an error, it will return the error and set HTTP status to `400 Bad Request`. This method
+safely handles all error cases, including nil errors, preventing potential panics that could occur
+when using error handling methods.
+
+:::note
+This method replaces the previous `Must` method and includes improved error handling to prevent
+nil pointer dereference issues.
+:::🧰 Tools
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[uncategorized] ~465-~465: Possible missing comma found.
Context: ...00 Bad Request`. This function does NOT panic therefor you must still return on error...
(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...
(THEREFORE)
461-477: LGTM! Clear documentation for the renamed methods
The documentation clearly explains the purpose and behavior of both WithAutoHandling and WithoutAutoHandling methods, maintaining consistency with the code changes.
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[uncategorized] ~465-~465: Possible missing comma found.
Context: ...00 Bad Request`. This function does NOT panic therefor you must still return on error...
(AI_HYDRA_LEO_MISSING_COMMA)
[grammar] ~465-~465: Did you mean to write ‘therefore’?
Context: ... Request`. This function does NOT panic therefor you must still return on error explicit...
(THEREFORE)
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🧹 Outside diff range and nitpick comments (3)
bind.go (2)
34-37: Enhance documentation for clarityWhile the documentation is good, consider adding examples to illustrate proper usage, especially regarding the note about explicit error returns.
Example addition:
// If you want to handle binder errors automatically, you can use `WithAutoHandling`. // If there's an error, it will return the error and set HTTP status to `400 Bad Request`. // You must still return on error explicitly +// +// Example: +// if err := c.Bind().WithAutoHandling().JSON(&data); err != nil { +// return err // Required: must explicitly return the error +// }🧰 Tools
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34-34: File is not
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66-66: Fix typo in documentationThere's a typo in the comment:
-// NOTE: WithAutoHandling/WithAutoHandling is still valid for Custom binders. +// NOTE: WithAutoHandling/WithoutAutoHandling is still valid for Custom binders.ctx.go (1)
1863-1864: Field rename looks good, but fix formattingThe rename from
shouldtodontHandleErrsimproves clarity and aligns with the nil pointer dereference fix. However, there's a minor formatting issue.Fix the extra spaces after the colon:
- ctx : c, - dontHandleErrs: true, + ctx: c, + dontHandleErrs: true,🧰 Tools
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bind.go(3 hunks)ctx.go(3 hunks)
🧰 Additional context used
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bind.go
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🔇 Additional comments (5)
bind.go (4)
22-23: LGTM: Field rename improves clarity
The rename from should to dontHandleErrs better communicates the field's purpose and aligns with the new method names.
🧰 Tools
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22-22: File is not goimports-ed
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43-46: LGTM: Proper nil check prevents panic
The nil check before accessing the error properly fixes the nil pointer dereference issue.
49-50:
Security: Avoid exposing internal error details
The current implementation exposes internal error details to clients, which could leak sensitive information.
Consider implementing a more secure error handling approach:
b.ctx.Status(StatusBadRequest)
-return NewError(StatusBadRequest, "Bad request: "+err.Error())
+// Log the detailed error for debugging
+b.ctx.App().Logger().Error(err)
+// Return a generic error message to the client
+return NewError(StatusBadRequest, "Invalid request format")28-40: Verify method rename impact
Let's verify that all call sites have been updated to use the new method names.
✅ Verification successful
Based on the analysis of the shell script results, I can now generate the final response:
Method rename impact verified successfully
The codebase shows proper adoption of the new method names:
WithAutoHandling()is used in tests and properly tested for error handling- No instances of old method names (
Must()orShould()) were found - The new methods are well documented and have proper test coverage
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#!/bin/bash
# Search for any remaining usage of old method names
echo "Checking for old method names..."
rg -l "\.Must\(\)" --type go
rg -l "\.Should\(\)" --type go
# Search for usage of new method names to ensure proper adoption
echo "Checking new method usage..."
rg -l "\.WithAutoHandling\(\)" --type go
rg -l "\.WithoutAutoHandling\(\)" --type go
Length of output: 307
Script:
#!/bin/bash
# Let's check the actual usage context of these methods
echo "Checking WithAutoHandling usage context..."
rg "\.WithAutoHandling\(\)" -B 2 -A 2 --type go
echo "Checking if there are any other similar method patterns in bind.go..."
rg "func.*Bind.*\)" bind.go
# Let's also check test coverage to ensure the new methods are properly tested
echo "Checking test coverage..."
cat bind_test.go
Length of output: 48495
🧰 Tools
🪛 golangci-lint (1.61.0)
34-34: File is not gofumpt-ed with -extra
(gofumpt)
ctx.go (1)
643-643: Documentation improvement looks good!
The added comment clarifies that the function is generic and can handle different header types, which improves code maintainability.
|
Thx |
if err is nil err.Error() panics
(eg. c.Bind().Must().JSON(...) successfully binds but panics