Add solution for Challenge 9 by Kosench #770
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WalkthroughAdds a single Go file implementing an in-memory RESTful Book Management API with layered architecture: model, repository (thread-safe), service (validation/business rules), HTTP handlers, error mapping, and a main function wiring routes and starting a server. Changes
Sequence Diagram(s)sequenceDiagram
participant C as Client
participant H as BookHandler
participant S as BookService
participant R as InMemoryBookRepository
Note over C,H: HTTP request (GET/POST/PUT/DELETE/search)
C->>H: HTTP Request
H->>H: parse request, extract id/params, validate JSON
H->>S: call service method
S->>S: business validation (fields, ISBN uniqueness, year)
S->>R: repository operation (Get/Create/Update/Delete/Search)
R->>R: RWMutex lock/access in-memory map
R-->>S: result / error
S-->>H: result / error
H->>H: map error -> status, marshal JSON
H-->>C: HTTP JSON response
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
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Pre-merge checks❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 3
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challenge-9/submissions/Kosench/solution-template.go(1 hunks)
🔇 Additional comments (19)
challenge-9/submissions/Kosench/solution-template.go (19)
1-15: LGTM!The package structure and imports are well-organized. The use of standard library packages alongside
github.com/google/uuidis appropriate for this RESTful API implementation.
17-21: LGTM!Sentinel errors are well-defined and follow Go best practices. These are appropriately used throughout the codebase for error handling and status code mapping.
28-35: LGTM!The Book model is clean and well-structured with appropriate JSON tags for API serialization.
42-51: LGTM!The repository interface is well-designed with a comprehensive set of CRUD and search operations.
54-77: LGTM!Excellent implementation with proper use of
RWMutexfor concurrent reads and defensive copying to prevent external mutations. The constructor is clean and initializes the map correctly.
79-89: LGTM!Consistent defensive copying and proper error handling with the sentinel error
ErrBookNotFound.
91-101: LGTM!Proper write lock usage and duplicate checking before insertion.
103-121: LGTM!Comprehensive validation with proper nil and empty checks, correct write lock usage, and existence verification before update.
123-137: LGTM!Clean delete implementation with proper validation, locking, and existence checking.
193-213: LGTM!Clean service layer design with proper interface definition and dependency injection through the constructor.
215-225: LGTM!Proper validation in
GetBookByIDbefore delegating to the repository.
227-261: LGTM!Comprehensive validation including required fields, year bounds, ISBN uniqueness, and proper UUID generation. The descriptive error messages are appropriate for API responses.
263-308: LGTM!Excellent update logic that properly handles ISBN uniqueness only when the ISBN is being changed, preventing false conflicts. Comprehensive validation and proper ID assignment.
310-332: LGTM!Clean implementations with appropriate validation of search parameters before delegation to the repository.
339-400: LGTM!Excellent routing implementation with proper ID validation for different HTTP methods. The checks preventing ID in POST URLs and requiring ID for PUT/DELETE operations are particularly good API design.
402-508: LGTM!All handlers follow a consistent pattern with proper error handling and appropriate HTTP status codes. The use of
mapErrorToStatusCodeensures uniform error responses across the API.
510-514: LGTM!Clean error response structure with appropriate JSON tag to omit status code from the response body.
520-569: LGTM!Well-implemented helper functions. The error mapping logic properly uses
errors.Isfor sentinel errors and string matching for validation errors, ensuring appropriate HTTP status codes.
571-586: LGTM!Clean initialization and dependency wiring. Registering both
/api/booksand/api/books/routes ensures proper handling of both collection and individual resource endpoints.
1 participant
Challenge 9 Solution
Submitted by: @Kosench
Challenge: Challenge 9
Description
This PR contains my solution for Challenge 9.
Changes
challenge-9/submissions/Kosench/solution-template.goTesting
Thank you for reviewing my submission! 🚀