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@magic-peach magic-peach commented Jan 5, 2026

##PR Description
Summary

This PR adds a structured JSON logging middleware to the Gateway to improve observability, debugging, and production monitoring.

Changes

  1. Introduced a Gin middleware that logs every request in structured JSON format
  2. Logs request method, path, status code, latency, and client IP
  3. Captures payment verification context (payment_verified, user_wallet) when available
  4. Configurable log level via LOG_LEVEL environment variable
  5. Logs output to stdout for container and log aggregator compatibility
  6. Added unit tests for the logging middleware

fixes #17

Summary by CodeRabbit

  • New Features

    • Added health/readiness endpoints including checks for downstream services
    • Added structured request logging middleware for JSON logs and per-request metrics
    • Introduced AI summary invocation pathway and receipt generation/forwarding
  • Improvements

    • Enhanced payment verification flow with clearer 402/403 responses
    • Strengthened error handling and HTTP status consistency across endpoints

✏️ Tip: You can customize this high-level summary in your review settings.

Greptile Overview

Greptile Summary

This PR attempts to add structured JSON logging middleware using zerolog but contains critical merge conflicts that prevent compilation.

Key Changes:

  • Added gateway/middleware/logger.go implementing structured JSON logging with configurable log levels
  • Logger captures request metadata (method, path, status, latency, client IP) and payment context (payment_verified, user_wallet)
  • Integrated middleware into Gin router with gin.New() + custom middleware setup
  • Added zerolog dependency to gateway/go.mod

Critical Issues Found:

  • gateway/main.go has multiple unresolved merge conflicts with duplicate function definitions, unreachable code blocks, and syntax errors across lines 62-78, 126-131, 253-285, 414-428, 464-471, and 523-577
  • The code will not compile due to duplicate main() and validateConfig() functions, conflicting gin.New()/gin.Default() initialization, and invalid variable references
  • Root-level go.mod and go.sum files incorrectly added (invalid Go version 1.25.5, wrong location for monorepo)
  • Missing return statement after error response on line 285
  • Unused handleHealth() function shadows handleHealthz()

The middleware implementation itself is clean, but the integration is completely broken and must be redone.

Confidence Score: 0/5

  • This PR cannot be merged - it will not compile due to merge conflicts
  • Score of 0 reflects that gateway/main.go contains critical merge conflicts with duplicate functions, unreachable code, and syntax errors that make the codebase uncompilable. The root go.mod has an invalid Go version (1.25.5) and shouldn't exist in this monorepo structure. While the middleware/logger.go implementation is sound, the integration is completely broken.
  • gateway/main.go requires immediate attention to resolve all merge conflicts before any review of functionality can proceed. Delete root-level go.mod and go.sum files.

Important Files Changed

Filename Overview
gateway/main.go CRITICAL: Contains multiple merge conflicts with duplicate/unreachable code, will not compile
gateway/middleware/logger.go Clean implementation of structured JSON logging middleware using zerolog
go.mod Invalid Go version (1.25.5), shouldn't exist at repository root in monorepo
go.sum Shouldn't exist at repository root in monorepo structure

Sequence Diagram

sequenceDiagram
    participant Client
    participant Gateway
    participant Logger as RequestLogger Middleware
    participant Handler as handleSummarize
    participant Verifier
    participant OpenRouter as AI Service

    Client->>Gateway: POST /api/ai/summarize
    Gateway->>Logger: Start request timing
    Logger->>Handler: c.Next() - pass to handler
    
    Handler->>Handler: Check X-402-Signature & X-402-Nonce headers
    alt Missing payment headers
        Handler->>Handler: c.Set("payment_verified", false)
        Handler-->>Client: 402 Payment Required
    else Headers present
        Handler->>Verifier: POST /verify (payment context + signature)
        Verifier-->>Handler: VerifyResponse (is_valid, recovered_address)
        
        alt Invalid signature
            Handler->>Handler: c.Set("payment_verified", false)
            Handler-->>Client: 403 Invalid Signature
        else Valid signature
            Handler->>Handler: c.Set("payment_verified", true)
            Handler->>Handler: c.Set("user_wallet", recovered_address)
            Handler->>OpenRouter: POST /chat/completions (summarize text)
            OpenRouter-->>Handler: AI summary response
            Handler->>Handler: Generate receipt & store
            Handler-->>Client: 200 OK (summary + X-402-Receipt header)
        end
    end
    
    Handler->>Logger: Request complete
    Logger->>Logger: Calculate latency, read payment_verified & user_wallet from context
    Logger->>Logger: log.Info() - structured JSON log with method, path, status, latency, payment_verified, user_wallet
    Logger-->>Gateway: Complete middleware chain
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coderabbitai bot commented Jan 5, 2026

Note

Other AI code review bot(s) detected

CodeRabbit 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.

📝 Walkthrough

Walkthrough

Adds zerolog-based structured request logging middleware, wires it into the Gin router, and updates gateway dependencies; also introduces health endpoints and payment verification types/flows in the gateway entrypoint.

Changes

Cohort / File(s) Summary
Dependencies
gateway/go.mod, go.mod
Added github.com/rs/zerolog v1.34.0 and related indirect deps (github.com/mattn/go-colorable, github.com/mattn/go-isatty, golang.org/x/sys).
Logging Middleware
gateway/middleware/logger.go
New zerolog init (InitLogger) and RequestLogger() Gin middleware that logs method, path, status, latency_ms, client IP and context fields (payment_verified, user_wallet) as JSON to stdout; log level from LOG_LEVEL.
Gateway core / API
gateway/main.go
Integrates middleware, registers health/readiness endpoints, introduces PaymentContext, VerifyRequest, VerifyResponse types, and adds payment verification and OpenRouter call scaffolding plus related helper functions and error handling paths.

Sequence Diagram(s)

sequenceDiagram
    participant C as Client
    participant G as Gateway
    participant L as Logger
    participant H as Handler

    rect rgba(240, 248, 255, 0.5)
    C->>G: HTTP request
    G->>L: enter RequestLogger
    L->>L: record start time / capture headers
    L->>H: forward request
    H-->>L: response (status, context vals)
    L->>L: compute latency_ms, collect client_ip, payment_verified, user_wallet
    L->>L: emit JSON log to stdout
    L-->>C: return response
    end
Loading
sequenceDiagram
    participant C as Client
    participant GW as Gateway
    participant VS as Verifier Service
    participant OR as OpenRouter

    rect rgba(255, 240, 245, 0.5)
    C->>GW: /api/ai/summarize (may include payment headers)
    alt Missing payment headers
        GW-->>C: 402 + PaymentContext payload
    else Has payment headers
        GW->>VS: POST /verify (VerifyRequest)
        alt Verifier returns valid
            VS-->>GW: VerifyResponse(valid)
            GW->>GW: mark payment_verified, store user_wallet
            GW->>OR: callOpenRouter (AI request)
            OR-->>GW: AI response
            GW-->>C: 200 + summary (+ receipt headers)
        else Verifier returns invalid
            VS-->>GW: VerifyResponse(invalid)
            GW-->>C: 403 Forbidden
        else Verifier timeout/error
            VS--xGW: error/timeout
            GW-->>C: 504 Gateway Timeout
        end
    end
    end
Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~50 minutes

Possibly related issues

  • Issue #14: Implements zerolog-based Gin RequestLogger middleware—addresses same logging middleware addition and JSON output requirements.
  • Issue #17: Core requirements for structured request logging (method, path, status, latency, client IP, payment verification) are implemented here.

Possibly related PRs

  • PR #81: Touches gateway health/readiness endpoints and helper health checks—overlaps with added health checks here.
  • PR #67: Modifies middleware and correlation ID propagation—related to middleware integration and propagation in callOpenRouter.
  • PR #36: Adds context-aware OpenRouter HTTP calls and timeout propagation—directly related to callOpenRouter changes.

Suggested labels

Hard

Suggested reviewers

  • AnkanMisra

Poem

🐰 I hopped through code where logs now gleam,
JSON carrots in a structured stream.
Requests I watched, latencies I kept,
Payment stamps and receipts adept—
Happy hops, the gateway hums like a dream! 🥕✨

🚥 Pre-merge checks | ✅ 2 | ❌ 3
❌ Failed checks (2 warnings, 1 inconclusive)
Check name Status Explanation Resolution
Linked Issues check ⚠️ Warning The PR fails to fully meet issue #17 requirements: logging middleware with JSON output, latency, method, path, status, and client IP are implemented in gateway/middleware/logger.go; however, gateway/main.go contains critical compilation errors (duplicate main function, conflicting verification logic, incomplete functions) that prevent the code from running and rendering the implementation non-functional. Fix all syntax and logic errors in gateway/main.go (remove duplicate main, resolve conflicting verification blocks, complete function bodies) to restore compilation and enable the logging middleware to function correctly per issue #17 requirements.
Out of Scope Changes check ⚠️ Warning While the core logging middleware aligns with issue #17, gateway/main.go introduces significant out-of-scope additions: payment verification flows, OpenRouter AI integration, health check endpoints, and receipt generation that go beyond structured logging requirements and are not documented in the linked issue. Either split this PR into separate feature branches (logging middleware vs. payment/verification/AI integration) or add linked issues detailing the payment verification and AI integration requirements to document all objectives.
Title check ❓ Inconclusive The PR title 'added all logging middleware files' is vague and only partially describes the main changes; it focuses on the middleware file addition but omits the substantial expansions to gateway/main.go and broader system integration. Use a more descriptive title such as 'Add structured JSON logging middleware and integrate verifier service' to better capture the primary scope of the PR.
✅ Passed checks (2 passed)
Check name Status Explanation
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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Additional Comments (5)

  1. gateway/main.go, line 56-91 (link)

    syntax: Duplicate function declarations: main() is declared twice (lines 56 and 73). The first incomplete declaration starting at line 56 needs to be removed. Additionally, line 57 has invalid code: _ = godotenv.Load("../.env") which doesn't match the pattern below.

  2. gateway/main.go, line 182-232 (link)

    syntax: Duplicate/conflicting code blocks for payment verification. Lines 183-194 attempt one approach, then lines 198-232 redefine the same logic. The code at lines 209-232 is the newer version but lines 183-194 should be completely removed as they're outdated and create duplicate code paths.

    Remove lines 183-194 entirely (the incomplete first attempt).

  3. gateway/main.go, line 262-263 (link)

    syntax: Decode errors ignored: The JSON decode error is discarded with _. This suppresses potential parsing errors from the verifier response. It should check for errors:

  4. gateway/main.go, line 335-342 (link)

    syntax: Incomplete function definition: callOpenRouter(text string) at line 335 is incomplete and conflicts with the proper definition at line 342. Line 335-337 should be removed entirely as it doesn't include the context.Context parameter and is overwritten below:

  5. gateway/main.go, line 380-383 (link)

    logic: Removed critical response parsing logic: The response from OpenRouter is no longer parsed to extract the actual summary. Previously (removed lines), the code extracted result["choices"][0]["message"]["content"] to get the actual AI response. Now it just returns a hardcoded "stub summary" string, meaning the AI response is completely ignored and users always get a placeholder response.

    The AI parsing logic must be restored to actually return the model's output:

6 files reviewed, 5 comments

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Actionable comments posted: 2

Fix all issues with AI Agents 🤖
In @gateway/main.go:
- Around line 198-212: Remove the duplicate, incomplete verification block that
constructs verifyReq and calls http.Post (the code that creates verifyReq, does
body, _ := json.Marshal(...), then resp, err := http.Post(...), and its
immediate error branch), and retain only the subsequent correct implementation
that uses a context with timeout; ensure you do not leave duplicate declarations
of verifyReq, body, or signature and that imports/variables used by the
remaining context-with-timeout implementation remain unchanged.
- Line 263: The JSON decode error from
json.NewDecoder(resp.Body).Decode(&verifyResp) is being ignored, which can hide
malformed verifier responses and cause verifyResp.IsValid to default false;
update the code to capture the Decode error into a variable, check it, and
handle it (log the error with context and body contents if helpful, and return
or propagate an error instead of proceeding), ensuring any non-nil decode error
triggers a clear failure path rather than silently treating the payment as
invalid.

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (3)
gateway/main.go (3)

56-72: Critical: Duplicate/orphaned function declarations causing syntax errors.

Lines 56-72 contain an orphaned _ = godotenv.Load("../.env") statement and a validateConfig() function definition that appears to be misplaced before another main() function on line 73. This will cause compilation errors.

This looks like a merge conflict or incomplete refactoring. The code from lines 56-72 should either be removed or properly integrated.

🔎 Proposed fix - remove orphaned code
-func main() {
-	_ = godotenv.Load("../.env")
 func validateConfig() error {
 	required := []string{
 		"OPENROUTER_API_KEY",

Move validateConfig() outside of any main() block and ensure only one main() function exists.


183-196: Critical: Duplicate payment context code blocks.

Lines 183-188 and 189-195 contain duplicate logic for handling missing payment headers. This appears to be remnants of a merge conflict:

c.Set("payment_verified", false)
ctx := createPaymentContext()
c.JSON(402, gin.H{...})
// Then immediately followed by:
paymentContext := createPaymentContext()
c.JSON(402, gin.H{...})

Only one of these blocks should remain.

🔎 Proposed fix
 	if signature == "" || nonce == "" {
 		c.Set("payment_verified", false)
-
-		ctx := createPaymentContext()
-		c.JSON(402, gin.H{
-			"error":          "Payment Required",
-			"paymentContext": ctx,
 		paymentContext := createPaymentContext()
 		c.JSON(402, gin.H{
 			"error":          "Payment Required",
 			"message":        "Please sign the payment context",
 			"paymentContext": paymentContext,
 		})
 		return
 	}

335-384: Critical: Duplicate function signatures and stub return value.

Multiple issues in callOpenRouter:

  1. Duplicate signatures: Line 335 declares callOpenRouter(text string) while line 342 declares callOpenRouter(ctx context.Context, text string). Only one can exist.

  2. Stub return: Line 383 returns "stub summary" instead of the actual AI response. The code builds and sends the request but never extracts the result from result.

🔎 Proposed fix
-func callOpenRouter(text string) (string, error) {
-	if text == "" {
-		return "", fmt.Errorf("empty text")
 func callOpenRouter(ctx context.Context, text string) (string, error) {
+	if text == "" {
+		return "", fmt.Errorf("empty text")
+	}
 	apiKey := os.Getenv("OPENROUTER_API_KEY")
 	// ... rest of implementation ...
 	
-	return "stub summary", nil
+	// Extract summary from OpenRouter response
+	choices, ok := result["choices"].([]interface{})
+	if !ok || len(choices) == 0 {
+		return "", fmt.Errorf("no choices in AI response")
+	}
+	choice, ok := choices[0].(map[string]interface{})
+	if !ok {
+		return "", fmt.Errorf("invalid choice format")
+	}
+	message, ok := choice["message"].(map[string]interface{})
+	if !ok {
+		return "", fmt.Errorf("invalid message format")
+	}
+	content, ok := message["content"].(string)
+	if !ok {
+		return "", fmt.Errorf("invalid content format")
+	}
+	return content, nil
 }
🧹 Nitpick comments (1)
gateway/middleware/logger.go (1)

46-54: Consider dynamic log level based on response status and conditional field inclusion.

Two suggestions for improvement:

  1. Log level: Currently all requests log at Info level. Consider using Warn or Error for 4xx/5xx responses for better filtering in log aggregators.

  2. Null fields: When payment_verified or user_wallet are not set, they'll appear as null in JSON output, adding noise. Consider only including these fields when they have values.

🔎 Proposed improvement
-		log.Info().
+		event := log.Info()
+		if c.Writer.Status() >= 500 {
+			event = log.Error()
+		} else if c.Writer.Status() >= 400 {
+			event = log.Warn()
+		}
+
+		event.
 			Str("method", c.Request.Method).
 			Str("path", c.Request.URL.Path).
 			Int("status", c.Writer.Status()).
 			Int64("latency_ms", latency.Milliseconds()).
-			Str("client_ip", c.ClientIP()).
-			Interface("payment_verified", paymentVerified).
-			Interface("user_wallet", userWallet).
-			Msg("request completed")
+			Str("client_ip", c.ClientIP())
+
+		if paymentVerified != nil {
+			event.Interface("payment_verified", paymentVerified)
+		}
+		if userWallet != nil {
+			event.Interface("user_wallet", userWallet)
+		}
+
+		event.Msg("request completed")
📜 Review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d5e6dee and ed8db13.

⛔ Files ignored due to path filters (2)
  • gateway/go.sum is excluded by !**/*.sum
  • go.sum is excluded by !**/*.sum
📒 Files selected for processing (4)
  • gateway/go.mod
  • gateway/main.go
  • gateway/middleware/logger.go
  • go.mod
🧰 Additional context used
🧬 Code graph analysis (1)
gateway/main.go (2)
gateway/middleware/logger.go (2)
  • InitLogger (13-30)
  • RequestLogger (33-56)
src/services/payment.ts (1)
  • PaymentContext (8-14)
🔇 Additional comments (6)
gateway/middleware/logger.go (1)

12-30: LGTM - Robust log level initialization.

The implementation correctly:

  • Reads LOG_LEVEL from environment with sensible default
  • Gracefully handles invalid log level values by falling back to InfoLevel
  • Configures structured JSON output to stdout with timestamps

This meets the PR requirements for configurable log levels.

gateway/main.go (3)

117-124: LGTM - Clean middleware integration.

Good approach using gin.New() with explicit middleware registration rather than gin.Default(). The order is correct:

  1. gin.Recovery() for panic handling
  2. middleware.RequestLogger() to capture all requests

This ensures all requests are logged, including those that panic.


166-171: LGTM - Simple health check endpoint.

Appropriate health check implementation with its own shorter timeout (2s). Returns minimal payload suitable for load balancer/container orchestration health probes.


271-272: LGTM - Payment context properly set for logging.

Setting payment_verified and user_wallet in the Gin context allows the RequestLogger middleware to capture these values in the structured logs, meeting the PR requirement to include payment verification context.

go.mod (1)

1-10: Go version mismatch between modules.

The root go.mod uses Go 1.25.5 while gateway/go.mod uses Go 1.24.4. If this is a workspace configuration, clarify whether the version difference is intentional. The indirect dependency markings in the root go.mod are correct since the module contains no direct code; the gateway module properly declares zerolog as a direct dependency since it imports it.

gateway/go.mod (1)

10-10: LGTM — zerolog v1.34.0 is the latest version and a solid choice for structured JSON logging.

zerolog is a well-established, performant structured logging library that aligns well with the PR's JSON log output objectives.

Comment on lines +198 to +212
verifyReq := VerifyRequest{
Context: PaymentContext{
Recipient: getRecipientAddress(),
Token: "USDC",
Amount: getPaymentAmount(),
Nonce: nonce,
ChainID: getChainID(),
},
Signature: signature,
}

body, _ := json.Marshal(verifyReq)
resp, err := http.Post("http://127.0.0.1:3002/verify", "application/json", bytes.NewBuffer(body))
if err != nil {
c.JSON(500, gin.H{"error": "verifier unavailable"})
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⚠️ Potential issue | 🔴 Critical

Critical: Duplicate verification request code - remove the first block.

Lines 198-212 contain an incomplete verification request implementation using http.Post without timeout handling. This is followed by the correct implementation on lines 214-260 that properly uses context with timeout.

Remove the first block (lines 198-212) and keep only the second implementation.

🤖 Prompt for AI Agents
In @gateway/main.go around lines 198-212, Remove the duplicate, incomplete
verification block that constructs verifyReq and calls http.Post (the code that
creates verifyReq, does body, _ := json.Marshal(...), then resp, err :=
http.Post(...), and its immediate error branch), and retain only the subsequent
correct implementation that uses a context with timeout; ensure you do not leave
duplicate declarations of verifyReq, body, or signature and that
imports/variables used by the remaining context-with-timeout implementation
remain unchanged.

c.JSON(500, gin.H{"error": "Failed to decode verification response"})
return
}
_ = json.NewDecoder(resp.Body).Decode(&verifyResp)
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⚠️ Potential issue | 🟠 Major

Silently ignoring JSON decode error can mask verification failures.

The decode error is discarded with _ = json.NewDecoder(...). If the verifier returns malformed JSON or an unexpected response, verifyResp.IsValid defaults to false, causing legitimate payments to fail without any indication of the actual problem.

🔎 Proposed fix
-	_ = json.NewDecoder(resp.Body).Decode(&verifyResp)
+	if err := json.NewDecoder(resp.Body).Decode(&verifyResp); err != nil {
+		log.Printf("error decoding verifier response: %v", err)
+		c.JSON(500, gin.H{"error": "Invalid verifier response"})
+		return
+	}
📝 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.

Suggested change
_ = json.NewDecoder(resp.Body).Decode(&verifyResp)
if err := json.NewDecoder(resp.Body).Decode(&verifyResp); err != nil {
log.Printf("error decoding verifier response: %v", err)
c.JSON(500, gin.H{"error": "Invalid verifier response"})
return
}
🤖 Prompt for AI Agents
In @gateway/main.go around line 263, The JSON decode error from
json.NewDecoder(resp.Body).Decode(&verifyResp) is being ignored, which can hide
malformed verifier responses and cause verifyResp.IsValid to default false;
update the code to capture the Decode error into a variable, check it, and
handle it (log the error with context and body contents if helpful, and return
or propagate an error instead of proceeding), ensuring any non-nil decode error
triggers a clear failure path rather than silently treating the payment as
invalid.

@AnkanMisra
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@magic-peach
Pull to the latest and fix the go issues

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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 (4)
gateway/main.go (4)

62-78: Critical: Malformed main() function causes compilation failure.

Lines 62-63 start a main() function but immediately define validateConfig() inside it without closing the first main(). Go does not support nested function definitions.

Remove the incomplete main() stub (lines 62-63) and keep validateConfig() as a standalone function.

🔧 Proposed fix
-func main() {
-	_ = godotenv.Load("../.env")
 func validateConfig() error {
 	required := []string{
 		"OPENROUTER_API_KEY",

253-269: Critical: Duplicate and malformed payment verification blocks.

Lines 253-260 contain incomplete code that conflicts with the proper implementation in lines 261-269:

  • Line 257-259 start a c.JSON(402, ...) but line 260 has an orphaned paymentContext := createPaymentContext()
  • Lines 261-269 duplicate the same check

Keep the logging context setup (c.Set("payment_verified", false)) but merge it into a single coherent block.

🔧 Proposed fix
 	if signature == "" || nonce == "" {
 		c.Set("payment_verified", false)
-
-		ctx := createPaymentContext()
-		c.JSON(402, gin.H{
-			"error":          "Payment Required",
-			"paymentContext": ctx,
-		paymentContext := createPaymentContext()
-	// Basic check
-	if signature == "" || nonce == "" {
 		c.JSON(402, gin.H{
 			"error":          "Payment Required",
 			"message":        "Please sign the payment context",
 			"paymentContext": createPaymentContext(),
 		})
 		return
 	}

523-577: Critical: Duplicate callOpenRouter function definitions prevent compilation.

Two conflicting function definitions exist:

  • Lines 523-527: callOpenRouter(text string) - incomplete stub
  • Lines 530-601: callOpenRouter(ctx context.Context, text string) - full implementation

Additionally, line 577 has return "stub summary", nil which would bypass the actual AI response parsing (lines 579-600).

Remove the stub (lines 523-527) and the premature return (line 577).

🔧 Proposed fix
-func callOpenRouter(text string) (string, error) {
-	if text == "" {
-		return "", fmt.Errorf("empty text")
 // callOpenRouter sends the given text to the OpenRouter chat completions API
 // requesting a two-sentence summary and returns the generated summary.

And remove the stub return:

 	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
 		return "", fmt.Errorf("failed to decode AI response: %w", err)
 	}
-	return "stub summary", nil

 	choices, ok := result["choices"].([]interface{})

1-33: Fix function declaration structure: remove incomplete main function and nested declarations.

The file has func validateConfig() incorrectly nested inside an incomplete func main() on line 62-63. Functions cannot be defined inside other function bodies. Remove lines 62-63 (the incomplete first main declaration), and keep validateConfig as a package-level function. The second func main() starting at line 79 appears to be the intended entry point.

🤖 Fix all issues with AI agents
In `@gateway/main.go`:
- Around line 232-237: The function handleHealth is defined but never
referenced; either delete handleHealth to remove dead code or swap its usage
with the currently used handleHealthz in the router so the /healthz endpoint
calls handleHealth instead; locate the router registration that references
handleHealthz and either replace that symbol with handleHealth or remove the
unused handleHealth function accordingly.
- Around line 126-131: The code declares the Gin router twice causing a
compilation error and duplicate logging; remove the second declaration `r :=
gin.Default()` and keep the first `r := gin.New()` with the middleware chain
(`gin.Recovery()` and `middleware.RequestLogger()`); ensure only the single `r`
variable initialized by `gin.New()` remains and that
`middleware.RequestLogger()` is not duplicated by Gin's default logger.
- Around line 464-474: The AI timeout handling currently inside
generateAndSendReceipt is misplaced; remove the block that checks for
context.DeadlineExceeded and the extra c.JSON calls so generateAndSendReceipt
only handles receipt encoding errors (leave the single c.JSON(500,
{"error":"Failed to encode receipt"}) and proper return) and move or re-add the
timeout handling into handleSummarize where AI requests are made (check for
errors.Is(err, context.DeadlineExceeded) and c.Request.Context().Err()). Ensure
you eliminate the multiple sequential c.JSON calls and that each branch returns
immediately after writing a single response.
♻️ Duplicate comments (2)
gateway/main.go (2)

271-285: Remove duplicate verification request block.

This block duplicates the verification logic that's properly implemented in verifyPayment() (lines 361-434). The http.Post call here lacks timeout handling, while the correct implementation uses context.WithTimeout.


414-431: Critical: Orphaned code references undefined c (gin.Context) in verifyPayment.

Lines 414-428 reference c.Set() and c.JSON(), but verifyPayment() only receives ctx context.Context, not a gin.Context. This causes undefined variable compilation errors.

Additionally, line 414 ignores the decode error (flagged in past review). Remove lines 414-428 and keep only the correct implementation (lines 429-431).

🔧 Proposed fix
-	_ = json.NewDecoder(resp.Body).Decode(&verifyResp)
-
-	if !verifyResp.IsValid {
-		c.Set("payment_verified", false)
-		c.JSON(403, gin.H{"error": "invalid signature"})
-		return
-	}
-
-	c.Set("payment_verified", true)
-	c.Set("user_wallet", verifyResp.RecoveredAddress)
-
-	var req SummarizeRequest
-	if err := c.BindJSON(&req); err != nil {
-		c.JSON(400, gin.H{"error": "invalid body"})
-		return
 	if err := json.NewDecoder(resp.Body).Decode(&verifyResp); err != nil {
 		return nil, nil, fmt.Errorf("decode verification response: %w", err)
 	}

@magic-peach
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@AnkanMisra please merge this

@AnkanMisra
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@magic-peach Bro what?
Screenshot 2026-01-24 at 19 32 08

@AnkanMisra
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@greptile review the pr

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12 files reviewed, 12 comments

Edit Code Review Agent Settings | Greptile

Comment on lines +126 to 131
r := gin.New()
r.Use(
gin.Recovery(),
middleware.RequestLogger(),
)
r := gin.Default()
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Merge conflict: gin.New() is configured correctly on lines 126-130, then immediately replaced with gin.Default() on line 131. The second assignment will overwrite the custom middleware setup.

Suggested change
r := gin.New()
r.Use(
gin.Recovery(),
middleware.RequestLogger(),
)
r := gin.Default()
// Init structured logging
middleware.InitLogger()
r := gin.New()
r.Use(
gin.Recovery(),
middleware.RequestLogger(),
)
Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 126:131

Comment:
Merge conflict: `gin.New()` is configured correctly on lines 126-130, then immediately replaced with `gin.Default()` on line 131. The second assignment will overwrite the custom middleware setup.

```suggestion
	// Init structured logging
	middleware.InitLogger()

	r := gin.New()
	r.Use(
		gin.Recovery(),
		middleware.RequestLogger(),
	)
```


How can I resolve this? If you propose a fix, please make it concise.

Comment on lines 253 to 269
@@ -235,6 +268,22 @@ func handleSummarize(c *gin.Context) {
return
}
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Merge conflict: incomplete payment verification logic duplicated with syntax errors. Line 260 declares ctx but tries to assign paymentContext (undefined), and lines 261-269 duplicate the logic from lines 262-268.

Suggested change
signature := c.GetHeader("X-402-Signature")
nonce := c.GetHeader("X-402-Nonce")
if signature == "" || nonce == "" {
c.Set("payment_verified", false)
c.JSON(402, gin.H{
"error": "Payment Required",
"message": "Please sign the payment context",
"paymentContext": createPaymentContext(),
})
return
}
Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 253:269

Comment:
Merge conflict: incomplete payment verification logic duplicated with syntax errors. Line 260 declares `ctx` but tries to assign `paymentContext` (undefined), and lines 261-269 duplicate the logic from lines 262-268.

```suggestion
	signature := c.GetHeader("X-402-Signature")
	nonce := c.GetHeader("X-402-Nonce")

	if signature == "" || nonce == "" {
		c.Set("payment_verified", false)
		c.JSON(402, gin.H{
			"error":          "Payment Required",
			"message":        "Please sign the payment context",
			"paymentContext": createPaymentContext(),
		})
		return
	}
```


How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +271 to +285
verifyReq := VerifyRequest{
Context: PaymentContext{
Recipient: getRecipientAddress(),
Token: "USDC",
Amount: getPaymentAmount(),
Nonce: nonce,
ChainID: getChainID(),
},
Signature: signature,
}

body, _ := json.Marshal(verifyReq)
resp, err := http.Post("http://127.0.0.1:3002/verify", "application/json", bytes.NewBuffer(body))
if err != nil {
c.JSON(500, gin.H{"error": "verifier unavailable"})
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Merge conflict: duplicate payment verification code that conflicts with the refactored verifyPayment() function used later. Lines 271-285 make a direct HTTP call without using context, missing error handling (line 285 has no return), and this code block is unreachable due to the return on line 268.

Delete this entire conflicted section - the correct implementation uses verifyPayment() on line 311.

Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 271:285

Comment:
Merge conflict: duplicate payment verification code that conflicts with the refactored `verifyPayment()` function used later. Lines 271-285 make a direct HTTP call without using context, missing error handling (line 285 has no `return`), and this code block is unreachable due to the `return` on line 268.

Delete this entire conflicted section - the correct implementation uses `verifyPayment()` on line 311.

How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +284 to +285
if err != nil {
c.JSON(500, gin.H{"error": "verifier unavailable"})
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Missing return statement after sending error response.

Suggested change
if err != nil {
c.JSON(500, gin.H{"error": "verifier unavailable"})
resp, err := http.Post("http://127.0.0.1:3002/verify", "application/json", bytes.NewBuffer(body))
if err != nil {
c.JSON(500, gin.H{"error": "verifier unavailable"})
return
}
Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 284:285

Comment:
Missing `return` statement after sending error response.

```suggestion
	resp, err := http.Post("http://127.0.0.1:3002/verify", "application/json", bytes.NewBuffer(body))
	if err != nil {
		c.JSON(500, gin.H{"error": "verifier unavailable"})
		return
	}
```


How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +414 to +428
_ = json.NewDecoder(resp.Body).Decode(&verifyResp)

if !verifyResp.IsValid {
c.Set("payment_verified", false)
c.JSON(403, gin.H{"error": "invalid signature"})
return
}

c.Set("payment_verified", true)
c.Set("user_wallet", verifyResp.RecoveredAddress)

var req SummarizeRequest
if err := c.BindJSON(&req); err != nil {
c.JSON(400, gin.H{"error": "invalid body"})
return
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Merge conflict: unreachable duplicate code inside verifyPayment() function. Lines 414-428 reference c.Set(), c.JSON(), and c.BindJSON() but c (gin.Context) is not available in this function - it takes context.Context, not gin.Context.

Delete this entire section - the correct return logic is on line 433.

Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 414:428

Comment:
Merge conflict: unreachable duplicate code inside `verifyPayment()` function. Lines 414-428 reference `c.Set()`, `c.JSON()`, and `c.BindJSON()` but `c` (gin.Context) is not available in this function - it takes `context.Context`, not `gin.Context`.

Delete this entire section - the correct return logic is on line 433.

How can I resolve this? If you propose a fix, please make it concise.

Comment on lines 523 to 577
@@ -506,6 +574,7 @@ func callOpenRouter(ctx context.Context, text string) (string, error) {
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
return "", fmt.Errorf("failed to decode AI response: %w", err)
}
return "stub summary", nil
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Merge conflict: duplicate callOpenRouter() function definition. Lines 523-525 define a stub version that returns "stub summary", while lines 526-600 contain the full implementation. The stub will never execute and line 577 return "stub summary", nil is unreachable dead code.

Delete the stub function (lines 523-525) and the unreachable return (line 577).

Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 523:577

Comment:
Merge conflict: duplicate `callOpenRouter()` function definition. Lines 523-525 define a stub version that returns `"stub summary"`, while lines 526-600 contain the full implementation. The stub will never execute and line 577 `return "stub summary", nil` is unreachable dead code.

Delete the stub function (lines 523-525) and the unreachable return (line 577).

How can I resolve this? If you propose a fix, please make it concise.

@@ -0,0 +1,10 @@
module microai-paygate

go 1.25.5
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Invalid Go version 1.25.5. The latest Go version is 1.23.x (as of early 2025). Valid format is go 1.23 or similar.

Suggested change
go 1.25.5
go 1.23
Prompt To Fix With AI
This is a comment left during a code review.
Path: go.mod
Line: 3:3

Comment:
Invalid Go version `1.25.5`. The latest Go version is 1.23.x (as of early 2025). Valid format is `go 1.23` or similar.

```suggestion
go 1.23
```


How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +1 to +10
module microai-paygate

go 1.25.5

require (
github.com/mattn/go-colorable v0.1.13 // indirect
github.com/mattn/go-isatty v0.0.19 // indirect
github.com/rs/zerolog v1.34.0 // indirect
golang.org/x/sys v0.12.0 // indirect
)
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This root-level go.mod shouldn't exist. The project structure shows this is a monorepo with separate modules (gateway/go.mod, verifier/Cargo.toml, web/package.json). The zerolog dependency should only be in gateway/go.mod, not at the root level.

Delete this file entirely - Go dependencies are already properly managed in gateway/go.mod.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

Prompt To Fix With AI
This is a comment left during a code review.
Path: go.mod
Line: 1:10

Comment:
This root-level `go.mod` shouldn't exist. The project structure shows this is a monorepo with separate modules (`gateway/go.mod`, `verifier/Cargo.toml`, `web/package.json`). The zerolog dependency should only be in `gateway/go.mod`, not at the root level.

Delete this file entirely - Go dependencies are already properly managed in `gateway/go.mod`.

<sub>Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!</sub>

How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +1 to +15
github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/rs/xid v1.6.0/go.mod h1:7XoLgs4eV+QndskICGsho+ADou8ySMSjJKDIan90Nz0=
github.com/rs/zerolog v1.34.0 h1:k43nTLIwcTVQAncfCw4KZ2VY6ukYoZaBPNOE8txlOeY=
github.com/rs/zerolog v1.34.0/go.mod h1:bJsvje4Z08ROH4Nhs5iH600c3IkWhwp44iRc54W6wYQ=
golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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This root-level go.sum shouldn't exist for the same reason as go.mod - this is a monorepo with module-specific dependency management.

Delete this file entirely.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

Prompt To Fix With AI
This is a comment left during a code review.
Path: go.sum
Line: 1:15

Comment:
This root-level `go.sum` shouldn't exist for the same reason as `go.mod` - this is a monorepo with module-specific dependency management.

Delete this file entirely.

<sub>Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!</sub>

How can I resolve this? If you propose a fix, please make it concise.

Comment on lines +232 to +237
func handleHealth(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{
"status": "ok",
"service": "gateway",
})
}
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handleHealth() function is defined but never used. The actual health check endpoint uses handleHealthz() on line 186.

Either remove this function or rename it to handleHealthz() and remove the duplicate definition on line 980.

Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 232:237

Comment:
`handleHealth()` function is defined but never used. The actual health check endpoint uses `handleHealthz()` on line 186.

Either remove this function or rename it to `handleHealthz()` and remove the duplicate definition on line 980.

How can I resolve this? If you propose a fix, please make it concise.

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greptile-apps bot commented Jan 24, 2026

Additional Comments (1)

gateway/main.go
Merge conflict: duplicate function definitions. Lines 62-78 (func main() and func validateConfig()) are duplicated again at lines 79-96.

func validateConfig() error {
	required := []string{
		"OPENROUTER_API_KEY",
	}
	var missing []string
	for _, key := range required {
		if os.Getenv(key) == "" {
			missing = append(missing, key)
		}
	}
	if len(missing) > 0 {
		return fmt.Errorf("missing required environment variables: %v", missing)
	}
	return nil
}

func main() {
Prompt To Fix With AI
This is a comment left during a code review.
Path: gateway/main.go
Line: 62:78

Comment:
Merge conflict: duplicate function definitions. Lines 62-78 (`func main()` and `func validateConfig()`) are duplicated again at lines 79-96.

```suggestion
func validateConfig() error {
	required := []string{
		"OPENROUTER_API_KEY",
	}
	var missing []string
	for _, key := range required {
		if os.Getenv(key) == "" {
			missing = append(missing, key)
		}
	}
	if len(missing) > 0 {
		return fmt.Errorf("missing required environment variables: %v", missing)
	}
	return nil
}

func main() {
```


How can I resolve this? If you propose a fix, please make it concise.

@AnkanMisra
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AnkanMisra commented Jan 24, 2026

@magic-peach so many bugs please fix the codebase and follow the docs

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Add request logging with structured JSON output

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