Chore: Optimize Neo4J Recipe #3336
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Summary of ChangesHello @stewartmbofana, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request focuses on optimizing the Neo4j recipe by implementing best practices for database interaction. Key changes include transitioning to parameterized queries for enhanced security and performance, centralizing the Neo4j driver management, and refining the API's error and response handling to provide clearer feedback using standard HTTP status codes. These improvements contribute to a more robust and maintainable application. Highlights
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stewartmbofana
changed the title
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. WalkthroughReplaces per-call DB connection with a single driver initialized in main, uses per-request read/write sessions, parameterizes Cypher queries, and returns JSON responses with net/http status constants. README receives minor formatting and error-handling constant updates. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
actor Client
participant Server as HTTP Server (main)
participant Handler as Request Handlers
participant Driver as Neo4j Driver (global)
participant DB as Neo4j DB
Note over Server,Driver: Startup
Server->>Driver: neo4j.NewDriver(...) // init once
Driver-->>Server: driver ready / error
alt driver error
Server-->>Server: log.Fatal
end
rect rgba(230,245,255,0.5)
Note over Client,DB: POST /movies
Client->>Server: POST /movies {title, released}
Server->>Handler: invoke createMovie
Handler->>Driver: Open write session (Database: "movies")
Handler->>DB: RUN CREATE (Movie) with params
DB-->>Handler: created node
Handler->>Driver: Close session
Handler-->>Server: 201 Created + JSON
end
rect rgba(240,255,230,0.5)
Note over Client,DB: GET /movies/:title
Client->>Server: GET /movies/Inception
Server->>Handler: invoke getMovie
Handler->>Driver: Open read session (Database: "movies")
Handler->>DB: RUN MATCH (Movie) with params
DB-->>Handler: node or none
Handler->>Driver: Close session
alt Found
Handler-->>Server: 200 OK + JSON
else Not found
Handler-->>Server: 404 Not Found
end
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Code Review
This pull request significantly improves the Neo4j recipe by addressing critical security vulnerabilities, correcting fundamental issues with database connection management, and aligning the API behavior with RESTful best practices. The changes replace insecure string-formatted queries with safe, parameterized queries, and refactor the session management to be thread-safe and efficient. Error handling and API responses have also been greatly improved for clarity and correctness. Overall, these are excellent and necessary optimizations.
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Actionable comments posted: 3
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
neo4j/main.go (1)
8-9: Resolve Neo4j driver version mismatch and session API
- Use v5 import path:
- "github.com/neo4j/neo4j-go-driver/neo4j" + "github.com/neo4j/neo4j-go-driver/v5/neo4j"
- Replace driver.Session calls with NewSession(SessionConfig) (POST at lines 42–47):
- session, err := driver.Session(neo4j.AccessModeWrite) - if err != nil { - return c.Status(http.StatusInternalServerError).SendString(err.Error()) - } - defer session.Close() + session := driver.NewSession(neo4j.SessionConfig{AccessMode: neo4j.AccessModeWrite}) + defer session.Close()
- Replace driver.Session calls with NewSession(SessionConfig) (GET at lines 67–72):
- session, err := driver.Session(neo4j.AccessModeRead) - if err != nil { - return c.Status(http.StatusInternalServerError).SendString(err.Error()) - } - defer session.Close() + session := driver.NewSession(neo4j.SessionConfig{AccessMode: neo4j.AccessModeRead}) + defer session.Close()
🧹 Nitpick comments (5)
neo4j/README.md (2)
80-80: Use 404 for “not found” (aligns with main.go and HTTP semantics)Change the example’s fallback from 500 to 404 to match main.go and better semantics.
Apply in the snippet:
- return c.SendStatus(http.StatusInternalServerError) + return c.SendStatus(http.StatusNotFound)
62-62: Avoid plaintext credentials in docsShow env-based configuration instead of hardcoding user/password to reduce copy‑paste of insecure patterns.
Example snippet:
uri := os.Getenv("NEO4J_URI") // e.g. neo4j://localhost:7687 user := os.Getenv("NEO4J_USER") pass := os.Getenv("NEO4J_PASSWORD") driver, err := neo4j.NewDriver(uri, neo4j.BasicAuth(user, pass, ""))neo4j/main.go (3)
74-75: Use consistent param map type (Go 1.18+)Minor: prefer
map[string]anyconsistently.- result, err := session.Run(query, map[string]interface{}{"title": title}) + result, err := session.Run(query, map[string]any{"title": title})
39-40: Prefer structured JSON error responsesReturn
{ "error": "..." }for consistency with JSON API.- return c.Status(http.StatusBadRequest).SendString(err.Error()) + return c.Status(http.StatusBadRequest).JSON(fiber.Map{"error": err.Error()}) @@ - return c.Status(http.StatusInternalServerError).SendString(err.Error()) + return c.Status(http.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()}) @@ - return c.Status(http.StatusInternalServerError).SendString(err.Error()) + return c.Status(http.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()}) @@ - return c.Status(http.StatusInternalServerError).SendString(err.Error()) + return c.Status(http.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})Also applies to: 44-44, 58-58, 76-76
33-33: Graceful shutdown (optional)Consider handling OS signals to close the driver before exit, not only via defer after Listen() returns.
Example:
sigCh := make(chan os.Signal, 1) signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM) go func() { <-sigCh _ = driver.Close() _ = app.Shutdown() }()
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Actionable comments posted: 2
♻️ Duplicate comments (2)
neo4j/main.go (2)
3-9: Use env-driven, context-aware driver; verify connectivity; avoid hard-coded credsMove URI/creds to env, adopt NewDriverWithContext, VerifyConnectivity, and Close(ctx). This strengthens security and aligns with v5 best practices. Based on learnings
Apply this diff:
import ( - "log" + "context" + "log" "net/http" + "os" "github.com/gofiber/fiber/v2" "github.com/neo4j/neo4j-go-driver/v5/neo4j" ) @@ func main() { - driver, err := neo4j.NewDriver("neo4j://localhost:7687", neo4j.BasicAuth("neo4j", "password", "")) + ctx := context.Background() + uri := os.Getenv("NEO4J_URI") // e.g. neo4j://localhost:7687 (dev) or neo4j+s://... (prod) + user := os.Getenv("NEO4J_USER") + pass := os.Getenv("NEO4J_PASSWORD") + if uri == "" || user == "" || pass == "" { + log.Fatal("missing NEO4J_URI/NEO4J_USER/NEO4J_PASSWORD") + } + driver, err := neo4j.NewDriverWithContext(uri, neo4j.BasicAuth(user, pass, "")) if err != nil { log.Fatal(err) } - defer driver.Close() + if err := driver.VerifyConnectivity(ctx); err != nil { + log.Fatal(err) + } + defer driver.Close(ctx)Also applies to: 19-25
56-63: Handle streamed result errors before returning 404Check result.Err() when Next() returns false; otherwise iteration errors are misreported as Not Found. Based on learnings
- if result.Next() { + if result.Next() { values := result.Record().Values() movie := Movie{ Title: values[0].(string), Tagline: values[1].(string), Released: values[2].(int64), Director: values[3].(string), } return c.JSON(movie) } - return c.SendStatus(http.StatusNotFound) + if err = result.Err(); err != nil { + return c.Status(http.StatusInternalServerError).SendString(err.Error()) + } + return c.SendStatus(http.StatusNotFound)Also applies to: 65-76
🧹 Nitpick comments (1)
neo4j/main.go (1)
56-61: Prefer ExecuteRead and alias returned columns for clarityOptional but cleaner: use ExecuteRead with ctx and alias returned fields to avoid positional coupling. Based on learnings
- result, err := session.Run(query, map[string]any{"title": title}) + query := `MATCH (n:Movie {title: $title}) + RETURN n.title AS title, n.tagline AS tagline, n.released AS released, n.director AS director` + resultAny, err := session.ExecuteRead(ctx, func(tx neo4j.ManagedTransaction) (any, error) { + return tx.Run(ctx, query, map[string]any{"title": title}) + }) + result := resultAny.(neo4j.ResultWithContext)Then read values in the same order or switch to named getters if preferred.
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⛔ Files ignored due to path filters (2)
neo4j/go.modis excluded by!**/*.modneo4j/go.sumis excluded by!**/*.sum,!**/*.sum
📒 Files selected for processing (1)
neo4j/main.go(2 hunks)
1 participant
Changes:
Summary by CodeRabbit
New Features
Refactor
Documentation