Add solution for gin challenge-1-basic-routing by labib99 #645
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WalkthroughAdds a new solution file for a Gin-based HTTP routing challenge, implementing a complete REST API with in-memory user storage, supporting CRUD operations and user search functionality with standardized JSON response handling. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes
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Actionable comments posted: 2
🧹 Nitpick comments (9)
packages/gin/challenge-1-basic-routing/submissions/labib99/solution.go (9)
3-9: Organize imports by grouping standard library and third-party packages.Go convention separates standard library imports from third-party packages with a blank line for better readability.
Apply this diff:
import ( "github.com/gin-gonic/gin" + "strconv" "strings" "errors" "fmt" )Should be:
import ( + "errors" + "fmt" + "strconv" + "strings" + "github.com/gin-gonic/gin" - "strconv" - "strings" - "errors" - "fmt" )
39-50: Route registration order may cause /users/search to match :id pattern.The
/users/searchroute (line 50) should be registered before/users/:id(line 42) to prevent "search" from being captured as an ID parameter. Gin's router may handle this correctly, but explicit ordering is safer and more maintainable.Apply this diff:
// GET /users - Get all users router.GET("/users", getAllUsers) + // GET /users/search - Search users by name + router.GET("/users/search", searchUsers) // GET /users/:id - Get user by ID router.GET("/users/:id", getUserByID) // POST /users - Create new user router.POST("/users", createUser) // PUT /users/:id - Update user router.PUT("/users/:id", updateUser) // DELETE /users/:id - Delete user router.DELETE("/users/:id", deleteUser) - // GET /users/search - Search users by name - router.GET("/users/search", searchUsers)
55-55: Remove completed TODO comment.The TODO indicates handlers need implementation, but they're already complete.
Apply this diff:
-// TODO: Implement handler functions -
57-64: Use named HTTP status constants instead of magic numbers.Replace magic number
200withhttp.StatusOKfor better readability and maintainability.Apply this diff:
+import "net/http" + func getAllUsers(c *gin.Context) { - c.JSON(200, Response{ + c.JSON(http.StatusOK, Response{ Success: true, Data: users, - Code: 200, + Code: http.StatusOK, }) }Apply this pattern to all handlers (lines 59-260).
81-92: Remove nil data from error response.When a user is not found, including
Data: user(which is nil) in the error response is confusing and unnecessary.Apply this diff:
user, index := findUserByID(userId) if index == -1 { c.JSON(404, Response{ Success: false, - Data: user, Message: "User not found", Error: "User not found", Code: 404, }) return }
125-128: Use idiomatic increment operator.In Go,
nextID++is more idiomatic thannextID += 1.Apply this diff:
// Add user to storage user.ID = nextID - nextID += 1 + nextID++ users = append(users, user)
247-252: Maintain consistency by returning User values instead of pointers.The
searchUsershandler returns[]*Userwhile other endpoints return[]UserorUser. Additionally, storing pointers to slice elements is risky if the underlying slice is reallocated during concurrent operations.Apply this diff:
- usersFound := []*User{} + usersFound := []User{} for idx, usr := range users { if userName := strings.ToLower(usr.Name); strings.Contains(userName, lname) { - usersFound = append(usersFound, &users[idx]) + usersFound = append(usersFound, usr) } }
265-265: Remove unnecessary parentheses in condition.The parentheses around
usr.ID == idare unnecessary in Go.Apply this diff:
- if (usr.ID == id) { + if usr.ID == id { return &users[idx], idx }
272-284: Consider validating Age field to prevent negative values.The
validateUserfunction validates Name and Email but doesn't check if Age is negative. Depending on requirements, you may want to add:if !strings.Contains(user.Email, "@") { return errors.New("invalid email format") } + if user.Age < 0 { + return errors.New("age cannot be negative") + } return nil
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📒 Files selected for processing (1)
packages/gin/challenge-1-basic-routing/submissions/labib99/solution.go(1 hunks)
🔇 Additional comments (2)
packages/gin/challenge-1-basic-routing/submissions/labib99/solution.go (2)
11-26: LGTM!The type definitions are well-structured with appropriate JSON tags for API responses.
177-185: Verify partial update semantics, especially for Age field.The condition
if user.Age > 0prevents updating a user's age to0. If this is intentional (treating 0 as "no update"), ensure it aligns with requirements. If legitimate zero values should be supported, consider using pointers in the update request to distinguish between "not provided" and "set to zero".Similar consideration applies to Name and Email (can't clear them to empty strings).
| // In-memory storage | ||
| var users = []User{ | ||
| {ID: 1, Name: "John Doe", Email: "[email protected]", Age: 30}, | ||
| {ID: 2, Name: "Jane Smith", Email: "[email protected]", Age: 25}, | ||
| {ID: 3, Name: "Bob Wilson", Email: "[email protected]", Age: 35}, | ||
| } | ||
| var nextID = 4 |
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Critical: Race condition on shared global state.
The global users slice and nextID variable are accessed concurrently by multiple HTTP handlers without synchronization. Gin handles each request in a separate goroutine, causing data races that can lead to:
- Lost updates or duplicate IDs
- Slice corruption during concurrent append operations
- Inconsistent reads
Wrap access to shared state with a mutex:
+import "sync"
+
// In-memory storage
+var mu sync.RWMutex
var users = []User{
{ID: 1, Name: "John Doe", Email: "[email protected]", Age: 30},
{ID: 2, Name: "Jane Smith", Email: "[email protected]", Age: 25},
{ID: 3, Name: "Bob Wilson", Email: "[email protected]", Age: 35},
}
var nextID = 4Then protect all reads with mu.RLock()/mu.RUnlock() and all writes with mu.Lock()/mu.Unlock() in handler functions.
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // In-memory storage | |
| var users = []User{ | |
| {ID: 1, Name: "John Doe", Email: "[email protected]", Age: 30}, | |
| {ID: 2, Name: "Jane Smith", Email: "[email protected]", Age: 25}, | |
| {ID: 3, Name: "Bob Wilson", Email: "[email protected]", Age: 35}, | |
| } | |
| var nextID = 4 | |
| import "sync" | |
| // In-memory storage | |
| var mu sync.RWMutex | |
| var users = []User{ | |
| {ID: 1, Name: "John Doe", Email: "[email protected]", Age: 30}, | |
| {ID: 2, Name: "Jane Smith", Email: "[email protected]", Age: 25}, | |
| {ID: 3, Name: "Bob Wilson", Email: "[email protected]", Age: 35}, | |
| } | |
| var nextID = 4 |
🤖 Prompt for AI Agents
In packages/gin/challenge-1-basic-routing/submissions/labib99/solution.go around
lines 28 to 34, the global users slice and nextID are accessed concurrently by
HTTP handlers causing data races; define a package-level sync.RWMutex (e.g., var
mu sync.RWMutex) next to users/nextID, then wrap all handler reads of
users/nextID with mu.RLock()/mu.RUnlock() and all mutations (append, remove,
update, and incrementing nextID) with mu.Lock()/mu.Unlock() so concurrent
requests are serialized safely.
| // PUT /users/:id - Update user | ||
| router.PUT("/users/:id", updateUser) | ||
| // DELETE /users/:id - Delete user | ||
| router.DELETE("users/:id", deleteUser) |
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Critical: Missing leading slash in DELETE route path.
The DELETE route is missing the leading "/" which will cause incorrect route matching.
Apply this diff:
- router.DELETE("users/:id", deleteUser)
+ router.DELETE("/users/:id", deleteUser)📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| router.DELETE("users/:id", deleteUser) | |
| router.DELETE("/users/:id", deleteUser) |
🤖 Prompt for AI Agents
In packages/gin/challenge-1-basic-routing/submissions/labib99/solution.go around
line 48 the DELETE route path is missing the leading "/" which prevents correct
route matching; update the route registration to use an absolute path by
changing the route string to "/users/:id" (i.e., router.DELETE("/users/:id",
deleteUser)) and save/rebuild to verify routing works.
2 participants
gin challenge-1-basic-routing Solution
Submitted by: @labib99
Package: gin
Challenge: challenge-1-basic-routing
Description
This PR contains my solution for gin challenge-1-basic-routing.
Changes
packages/gin/challenge-1-basic-routing/submissions/labib99/solution.goTesting
Thank you for reviewing my submission! 🚀