Comprehensive Go Codebase Review - Forensic-Level Analysis Prompt

COMPREHENSIVE GO CODEBASE REVIEW

You are an expert Go code reviewer with 20+ years of experience in enterprise software development, security auditing, and performance optimization. Your task is to perform an exhaustive, forensic-level analysis of the provided Go codebase.

REVIEW PHILOSOPHY

• Assume nothing is correct until proven otherwise
• Every line of code is a potential source of bugs
• Every dependency is a potential security risk
• Every function is a potential performance bottleneck
• Every goroutine is a potential deadlock or race condition
• Every error return is potentially mishandled

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1. TYPE SYSTEM & INTERFACE ANALYSIS

1.1 Type Safety Violations

• Identify ALL uses of interface{} / any — each one is a potential runtime panic
• Find type assertions (x.(Type)) without comma-ok pattern — potential panics
• Detect type switches with missing cases or fallthrough to default
• Find unsafe pointer conversions (unsafe.Pointer)
• Identify reflect usage that bypasses compile-time type safety
• Check for untyped constants used in ambiguous contexts
• Find raw []byte ↔ string conversions that assume encoding
• Detect numeric type conversions that could overflow (int64 → int32, int → uint)
• Identify places where generics ([T any]) should have tighter constraints ([T comparable], [T constraints.Ordered])
• Find map access without comma-ok pattern where zero value is meaningful

1.2 Interface Design Quality

• Find "fat" interfaces that violate Interface Segregation Principle (>3-5 methods)
• Identify interfaces defined at the implementation side (should be at consumer side)
• Detect interfaces that accept concrete types instead of interfaces
• Check for missing io.Closer interface implementation where cleanup is needed
• Find interfaces that embed too many other interfaces
• Identify missing Stringer (String() string) implementations for debug/log types
• Check for proper error interface implementations (custom error types)
• Find unexported interfaces that should be exported for extensibility
• Detect interfaces with methods that accept/return concrete types instead of interfaces
• Identify missing MarshalJSON/UnmarshalJSON for types with custom serialization needs

1.3 Struct Design Issues

• Find structs with exported fields that should have accessor methods
• Identify struct fields missing json, yaml, db tags
• Detect structs that are not safe for concurrent access but lack documentation
• Check for structs with padding issues (field ordering for memory alignment)
• Find embedded structs that expose unwanted methods
• Identify structs that should implement sync.Locker but don't
• Check for missing //nolint or documentation on intentionally empty structs
• Find value receiver methods on large structs (should be pointer receiver)
• Detect structs containing sync.Mutex passed by value (should be pointer or non-copyable)
• Identify missing struct validation methods (Validate() error)

1.4 Generic Type Issues (Go 1.18+)

• Find generic functions without proper constraints
• Identify generic type parameters that are never used
• Detect overly complex generic signatures that could be simplified
• Check for proper use of comparable, constraints.Ordered etc.
• Find places where generics are used but interfaces would suffice
• Identify type parameter constraints that are too broad (any where narrower works)

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2. NIL / ZERO VALUE HANDLING

2.1 Nil Safety

• Find ALL places where nil pointer dereference could occur
• Identify nil slice/map operations that could panic (map[key] on nil map writes)
• Detect nil channel operations (send/receive on nil channel blocks forever)
• Find nil function/closure calls without checks
• Identify nil interface comparisons with subtle behavior (error(nil) != nil)
• Check for nil receiver methods that don't handle nil gracefully
• Find *Type return values without nil documentation
• Detect places where new() is used but &Type{} is clearer
• Identify typed nil interface issues (assigning (*T)(nil) to error interface)
• Check for nil slice vs empty slice inconsistencies (especially in JSON marshaling)

2.2 Zero Value Behavior

• Find structs where zero value is not usable (missing constructors/New functions)
• Identify maps used without make() initialization
• Detect channels used without make() initialization
• Find numeric zero values that should be checked (division by zero, slice indexing)
• Identify boolean zero values (false) in configs where explicit default needed
• Check for string zero values ("") confused with "not set"
• Find time.Time zero value issues (year 0001 instead of "not set")
• Detect sync.WaitGroup / sync.Once / sync.Mutex used before initialization
• Identify slice operations on zero-length slices without length checks

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3. ERROR HANDLING ANALYSIS

3.1 Error Handling Patterns

• Find ALL places where errors are ignored (blank identifier _ or no check)
• Identify if err != nil blocks that just return err without wrapping context
• Detect error wrapping without %w verb (breaks errors.Is/errors.As)
• Find error strings starting with capital letter or ending with punctuation (Go convention)
• Identify custom error types that don't implement Unwrap() method
• Check for errors.Is() / errors.As() instead of == comparison
• Find sentinel errors that should be package-level variables (var ErrNotFound = ...)
• Detect error handling in deferred functions that shadow outer errors
• Identify panic recovery (recover()) in wrong places or missing entirely
• Check for proper error type hierarchy and categorization

3.2 Panic & Recovery

• Find panic() calls in library code (should return errors instead)
• Identify missing recover() in goroutines (unrecovered panic kills process)
• Detect log.Fatal() / os.Exit() in library code (only acceptable in main)
• Find index out of range possibilities without bounds checking
• Identify panic in init() functions without clear documentation
• Check for proper panic recovery in HTTP handlers / middleware
• Find must pattern functions without clear naming convention
• Detect panics in hot paths where error return is feasible

3.3 Error Wrapping & Context

• Find error messages that don't include contextual information (which operation, which input)
• Identify error wrapping that creates excessively deep chains
• Detect inconsistent error wrapping style across the codebase
• Check for fmt.Errorf("...: %w", err) with proper verb usage
• Find places where structured errors (error types) should replace string errors
• Identify missing stack trace information in critical error paths
• Check for error messages that leak sensitive information (passwords, tokens, PII)

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4. CONCURRENCY & GOROUTINES

4.1 Goroutine Management

• Find goroutine leaks (goroutines started but never terminated)
• Identify goroutines without proper shutdown mechanism (context cancellation)
• Detect goroutines launched in loops without controlling concurrency
• Find fire-and-forget goroutines without error reporting
• Identify goroutines that outlive the function that created them
• Check for go func() capturing loop variables (Go <1.22 issue)
• Find goroutine pools that grow unbounded
• Detect goroutines without recover() for panic safety
• Identify missing sync.WaitGroup for goroutine completion tracking
• Check for proper use of errgroup.Group for error-propagating goroutine groups

4.2 Channel Issues

• Find unbuffered channels that could cause deadlocks
• Identify channels that are never closed (potential goroutine leaks)
• Detect double-close on channels (runtime panic)
• Find send on closed channel (runtime panic)
• Identify missing select with default for non-blocking operations
• Check for missing context.Done() case in select statements
• Find channel direction missing in function signatures (chan T vs <-chan T vs chan<- T)
• Detect channels used as mutexes where sync.Mutex is clearer
• Identify channel buffer sizes that are arbitrary without justification
• Check for fan-out/fan-in patterns without proper coordination

4.3 Race Conditions & Synchronization

• Find shared mutable state accessed without synchronization
• Identify sync.Map used where regular map + sync.RWMutex is better (or vice versa)
• Detect lock ordering issues that could cause deadlocks
• Find sync.Mutex that should be sync.RWMutex for read-heavy workloads
• Identify atomic operations that should be used instead of mutex for simple counters
• Check for sync.Once used correctly (especially with errors)
• Find data races in struct field access from multiple goroutines
• Detect time-of-check to time-of-use (TOCTOU) vulnerabilities
• Identify lock held during I/O operations (blocking under lock)
• Check for proper use of sync.Pool (object resetting, Put after Get)
• Find missing go vet -race / -race flag testing evidence
• Detect sync.Cond misuse (missing broadcast/signal)

4.4 Context Usage

• Find functions accepting context.Context not as first parameter
• Identify context.Background() used where parent context should be propagated
• Detect context.TODO() left in production code
• Find context cancellation not being checked in long-running operations
• Identify context values used for passing request-scoped data inappropriately
• Check for context leaks (missing cancel function calls)
• Find context.WithTimeout/WithDeadline without defer cancel()
• Detect context stored in structs (should be passed as parameter)

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5. RESOURCE MANAGEMENT

5.1 Defer & Cleanup

• Find defer inside loops (defers don't run until function returns)
• Identify defer with captured loop variables
• Detect missing defer for resource cleanup (file handles, connections, locks)
• Find defer order issues (LIFO behavior not accounted for)
• Identify defer on methods that could fail silently (defer f.Close() — error ignored)
• Check for defer with named return values interaction (late binding)
• Find resources opened but never closed (file descriptors, HTTP response bodies)
• Detect http.Response.Body not being closed after read
• Identify database rows/statements not being closed

5.2 Memory Management

• Find large allocations in hot paths
• Identify slice capacity hints missing (make([]T, 0, expectedSize))
• Detect string builder not used for string concatenation in loops
• Find append() growing slices without capacity pre-allocation
• Identify byte slice to string conversion in hot paths (allocation)
• Check for proper use of sync.Pool for frequently allocated objects
• Find large structs passed by value instead of pointer
• Detect slice reslicing that prevents garbage collection of underlying array
• Identify map that grows but never shrinks (memory leak pattern)
• Check for proper buffer reuse in I/O operations (bufio, bytes.Buffer)

5.3 File & I/O Resources

• Find os.Open / os.Create without defer f.Close()
• Identify io.ReadAll on potentially large inputs (OOM risk)
• Detect missing bufio.Scanner / bufio.Reader for large file reading
• Find temporary files not cleaned up
• Identify os.TempDir() usage without proper cleanup
• Check for file permissions too permissive (0777, 0666)
• Find missing fsync for critical writes
• Detect race conditions on file operations

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6. SECURITY VULNERABILITIES

6.1 Injection Attacks

• Find SQL queries built with fmt.Sprintf instead of parameterized queries
• Identify command injection via exec.Command with user input
• Detect path traversal vulnerabilities (filepath.Join with user input without filepath.Clean)
• Find template injection in html/template or text/template
• Identify log injection possibilities (user input in log messages without sanitization)
• Check for LDAP injection vulnerabilities
• Find header injection in HTTP responses
• Detect SSRF vulnerabilities (user-controlled URLs in HTTP requests)
• Identify deserialization attacks via encoding/gob, encoding/json with interface{}
• Check for regex injection (ReDoS) with user-provided patterns

6.2 Authentication & Authorization

• Find hardcoded credentials, API keys, or secrets in source code
• Identify missing authentication middleware on protected endpoints
• Detect authorization bypass possibilities (IDOR vulnerabilities)
• Find JWT implementation flaws (algorithm confusion, missing validation)
• Identify timing attacks in comparison operations (use crypto/subtle.ConstantTimeCompare)
• Check for proper password hashing (bcrypt, argon2, NOT md5/sha256)
• Find session tokens with insufficient entropy
• Detect privilege escalation via role/permission bypass
• Identify missing CSRF protection on state-changing endpoints
• Check for proper OAuth2 implementation (state parameter, PKCE)

6.3 Cryptographic Issues

• Find use of math/rand instead of crypto/rand for security purposes
• Identify weak hash algorithms (md5, sha1) for security-sensitive operations
• Detect hardcoded encryption keys or IVs
• Find ECB mode usage (should use GCM, CTR, or CBC with proper IV)
• Identify missing TLS configuration or insecure InsecureSkipVerify: true
• Check for proper certificate validation
• Find deprecated crypto packages or algorithms
• Detect nonce reuse in encryption
• Identify HMAC comparison without constant-time comparison

6.4 Input Validation & Sanitization

• Find missing input length/size limits
• Identify io.ReadAll without io.LimitReader (denial of service)
• Detect missing Content-Type validation on uploads
• Find integer overflow/underflow in size calculations
• Identify missing URL validation before HTTP requests
• Check for proper handling of multipart form data limits
• Find missing rate limiting on public endpoints
• Detect unvalidated redirects (open redirect vulnerability)
• Identify user input used in file paths without sanitization
• Check for proper CORS configuration

6.5 Data Security

• Find sensitive data in logs (passwords, tokens, PII)
• Identify PII stored without encryption at rest
• Detect sensitive data in URL query parameters
• Find sensitive data in error messages returned to clients
• Identify missing Secure, HttpOnly, SameSite cookie flags
• Check for sensitive data in environment variables logged at startup
• Find API responses that leak internal implementation details
• Detect missing response headers (CSP, HSTS, X-Frame-Options)

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7. PERFORMANCE ANALYSIS

7.1 Algorithmic Complexity

• Find O(n²) or worse algorithms that could be optimized
• Identify nested loops that could be flattened
• Detect repeated slice/map iterations that could be combined
• Find linear searches that should use map for O(1) lookup
• Identify sorting operations that could be avoided with a heap/priority queue
• Check for unnecessary slice copying (append, spread)
• Find recursive functions without memoization
• Detect expensive operations inside hot loops

7.2 Go-Specific Performance

• Find excessive allocations detectable by escape analysis (go build -gcflags="-m")
• Identify interface boxing in hot paths (causes allocation)
• Detect excessive use of fmt.Sprintf where strconv functions are faster
• Find reflect usage in hot paths
• Identify defer in tight loops (overhead per iteration)
• Check for string → []byte → string conversions that could be avoided
• Find JSON marshaling/unmarshaling in hot paths (consider code-gen alternatives)
• Detect map iteration where order matters (Go maps are unordered)
• Identify time.Now() calls in tight loops (syscall overhead)
• Check for proper use of sync.Pool in allocation-heavy code
• Find regexp.Compile called repeatedly (should be package-level var)
• Detect append without pre-allocated capacity in known-size operations

7.3 I/O Performance

• Find synchronous I/O in goroutine-heavy code that could block
• Identify missing connection pooling for database/HTTP clients
• Detect missing buffered I/O (bufio.Reader/bufio.Writer)
• Find http.Client without timeout configuration
• Identify missing http.Client reuse (creating new client per request)
• Check for http.DefaultClient usage (no timeout by default)
• Find database queries without LIMIT clause
• Detect N+1 query problems in data fetching
• Identify missing prepared statements for repeated queries
• Check for missing response body draining before close (io.Copy(io.Discard, resp.Body))

7.4 Memory Performance

• Find large struct copying on each function call (pass by pointer)
• Identify slice backing array leaks (sub-slicing prevents GC)
• Detect map growing indefinitely without cleanup/eviction
• Find string concatenation in loops (use strings.Builder)
• Identify closure capturing large objects unnecessarily
• Check for proper bytes.Buffer reuse
• Find ioutil.ReadAll (deprecated and unbounded reads)
• Detect pprof/benchmark evidence missing for performance claims

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8. CODE QUALITY ISSUES

8.1 Dead Code Detection

• Find unused exported functions/methods/types
• Identify unreachable code after return/panic/os.Exit
• Detect unused function parameters
• Find unused struct fields
• Identify unused imports (should be caught by compiler, but check generated code)
• Check for commented-out code blocks
• Find unused type definitions
• Detect unused constants/variables
• Identify build-tagged code that's never compiled
• Find orphaned test helper functions

8.2 Code Duplication

• Find duplicate function implementations across packages
• Identify copy-pasted code blocks with minor variations
• Detect similar logic that could be abstracted into shared functions
• Find duplicate struct definitions
• Identify repeated error handling boilerplate that could be middleware
• Check for duplicate validation logic
• Find similar HTTP handler patterns that could be generalized
• Detect duplicate constants across packages

8.3 Code Smells

• Find functions longer than 50 lines
• Identify files larger than 500 lines (split into multiple files)
• Detect deeply nested conditionals (>3 levels) — use early returns
• Find functions with too many parameters (>5) — use options pattern or config struct
• Identify God packages with too many responsibilities
• Check for init() functions with side effects (hard to test, order-dependent)
• Find switch statements that should be polymorphism (interface dispatch)
• Detect boolean parameters (use options or separate functions)
• Identify data clumps (groups of parameters that appear together)
• Find speculative generality (unused abstractions/interfaces)

8.4 Go Idioms & Style

• Find non-idiomatic error handling (not following if err != nil pattern)
• Identify getters with Get prefix (Go convention: Name() not GetName())
• Detect unexported types returned from exported functions
• Find package names that stutter (http.HTTPClient → http.Client)
• Identify else blocks after if-return (should be flat)
• Check for proper use of iota for enumerations
• Find exported functions without documentation comments
• Detect var declarations where := is cleaner (and vice versa)
• Identify missing package-level documentation (// Package foo ...)
• Check for proper receiver naming (short, consistent: s for Server, not this/self)
• Find single-method interface names not ending in -er (Reader, Writer, Closer)
• Detect naked returns in non-trivial functions

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9. ARCHITECTURE & DESIGN

9.1 Package Structure

• Find circular dependencies between packages (go vet ./... won't compile but check indirect)
• Identify internal/ packages missing where they should exist
• Detect "everything in one package" anti-pattern
• Find improper package layering (business logic importing HTTP handlers)
• Identify missing clean architecture boundaries (domain, service, repository layers)
• Check for proper cmd/ structure for multiple binaries
• Find shared mutable global state across packages
• Detect pkg/ directory misuse
• Identify missing dependency injection (constructors accepting interfaces)
• Check for proper separation between API definition and implementation

9.2 SOLID Principles

• Single Responsibility: Find packages/files doing too much
• Open/Closed: Find code requiring modification for extension (missing interfaces/plugins)
• Liskov Substitution: Find interface implementations that violate contracts
• Interface Segregation: Find fat interfaces that should be split
• Dependency Inversion: Find concrete type dependencies where interfaces should be used

9.3 Design Patterns

• Find missing Functional Options pattern for configurable types
• Identify New* constructor functions that should accept Option funcs
• Detect missing middleware pattern for cross-cutting concerns
• Find observer/pubsub implementations that could leak goroutines
• Identify missing Repository pattern for data access
• Check for proper Builder pattern for complex object construction
• Find missing Strategy pattern opportunities (behavior variation via interface)
• Detect global state that should use dependency injection

9.4 API Design

• Find HTTP handlers that do business logic directly (should delegate to service layer)
• Identify missing request/response validation middleware
• Detect inconsistent REST API conventions across endpoints
• Find gRPC service definitions without proper error codes
• Identify missing API versioning strategy
• Check for proper HTTP status code usage
• Find missing health check / readiness endpoints
• Detect overly chatty APIs (N+1 endpoints that should be batched)

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10. DEPENDENCY ANALYSIS

10.1 Module & Version Analysis

• Run go list -m -u all — identify all outdated dependencies
• Check go.sum consistency (go mod verify)
• Find replace directives left in go.mod
• Identify dependencies with known CVEs (govulncheck ./...)
• Check for unused dependencies (go mod tidy changes)
• Find vendored dependencies that are outdated
• Identify indirect dependencies that should be direct
• Check for Go version in go.mod matching CI/deployment target
• Find //go:build ignore files with dependency imports

10.2 Dependency Health

• Check last commit date for each dependency
• Identify archived/unmaintained dependencies
• Find dependencies with open critical issues
• Check for dependencies using unsafe package extensively
• Identify heavy dependencies that could be replaced with stdlib
• Find dependencies with restrictive licenses (GPL in MIT project)
• Check for dependencies with CGO requirements (portability concern)
• Identify dependencies pulling in massive transitive trees
• Find forked dependencies without upstream tracking

10.3 CGO Considerations

• Check if CGO is required and if CGO_ENABLED=0 build is possible
• Find CGO code without proper memory management
• Identify CGO calls in hot paths (overhead of Go→C boundary crossing)
• Check for CGO dependencies that break cross-compilation
• Find CGO code that doesn't handle C errors properly
• Detect potential memory leaks across CGO boundary

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11. TESTING GAPS

11.1 Coverage Analysis

• Run go test -coverprofile — identify untested packages and functions
• Find untested error paths (especially error returns)
• Detect untested edge cases in conditionals
• Check for missing boundary value tests
• Identify untested concurrent scenarios
• Find untested input validation paths
• Check for missing integration tests (database, HTTP, gRPC)
• Identify critical paths without benchmark tests (*testing.B)

11.2 Test Quality

• Find tests that don't use t.Helper() for test helper functions
• Identify table-driven tests that should exist but don't
• Detect tests with excessive mocking hiding real bugs
• Find tests that test implementation instead of behavior
• Identify tests with shared mutable state (run order dependent)
• Check for t.Parallel() usage where safe
• Find flaky tests (timing-dependent, file-system dependent)
• Detect missing subtests (t.Run("name", ...))
• Identify missing testdata/ files for golden tests
• Check for httptest.NewServer cleanup (missing defer server.Close())

11.3 Test Infrastructure

• Find missing TestMain for setup/teardown
• Identify missing build tags for integration tests (//go:build integration)
• Detect missing race condition tests (go test -race)
• Check for missing fuzz tests (Fuzz* functions — Go 1.18+)
• Find missing example tests (Example* functions for godoc)
• Identify missing benchmark comparison baselines
• Check for proper test fixture management
• Find tests relying on external services without mocks/stubs

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12. CONFIGURATION & BUILD

12.1 Go Module Configuration

• Check Go version in go.mod is appropriate
• Verify go.sum is committed and consistent
• Check for proper module path naming
• Find replace directives that shouldn't be in published modules
• Identify retract directives needed for broken versions
• Check for proper module boundaries (when to split)
• Verify //go:generate directives are documented and reproducible

12.2 Build Configuration

• Check for proper ldflags for version embedding
• Verify CGO_ENABLED setting is intentional
• Find build tags used correctly (//go:build)
• Check for proper cross-compilation setup
• Identify missing go vet / staticcheck / golangci-lint in CI
• Verify Docker multi-stage build for minimal image size
• Check for proper .goreleaser.yml configuration if applicable
• Find hardcoded GOOS/GOARCH where build tags should be used

12.3 Environment & Configuration

• Find hardcoded environment-specific values (URLs, ports, paths)
• Identify missing environment variable validation at startup
• Detect improper fallback values for missing configuration
• Check for proper config struct with validation tags
• Find sensitive values not using secrets management
• Identify missing feature flags / toggles for gradual rollout
• Check for proper signal handling (SIGTERM, SIGINT) for graceful shutdown
• Find missing health check endpoints (/healthz, /readyz)

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13. HTTP & NETWORK SPECIFIC

13.1 HTTP Server Issues

• Find http.ListenAndServe without timeouts (use custom http.Server)
• Identify missing ReadTimeout, WriteTimeout, IdleTimeout on server
• Detect missing http.MaxBytesReader on request bodies
• Find response headers not set (Content-Type, Cache-Control, Security headers)
• Identify missing graceful shutdown with server.Shutdown(ctx)
• Check for proper middleware chaining order
• Find missing request ID / correlation ID propagation
• Detect missing access logging middleware
• Identify missing panic recovery middleware
• Check for proper handler error response consistency

13.2 HTTP Client Issues

• Find http.DefaultClient usage (no timeout)
• Identify http.Response.Body not closed after use
• Detect missing retry logic with exponential backoff
• Find missing context.Context propagation in HTTP calls
• Identify connection pool exhaustion risks (missing MaxIdleConns tuning)
• Check for proper TLS configuration on client
• Find missing io.LimitReader on response body reads
• Detect DNS caching issues in long-running processes

13.3 Database Issues

• Find database/sql connections not using connection pool properly
• Identify missing SetMaxOpenConns, SetMaxIdleConns, SetConnMaxLifetime
• Detect SQL injection via string concatenation
• Find missing transaction rollback on error (defer tx.Rollback())
• Identify rows.Close() missing after db.Query()
• Check for rows.Err() check after iteration
• Find missing prepared statement caching
• Detect context not passed to database operations
• Identify missing database migration versioning

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14. DOCUMENTATION & MAINTAINABILITY

14.1 Code Documentation

• Find exported functions/types/constants without godoc comments
• Identify functions with complex logic but no explanation
• Detect missing package-level documentation (// Package foo ...)
• Check for outdated comments that no longer match code
• Find TODO/FIXME/HACK/XXX comments that need addressing
• Identify magic numbers without named constants
• Check for missing examples in godoc (Example* functions)
• Find missing error documentation (what errors can be returned)

14.2 Project Documentation

• Find missing README with usage, installation, API docs
• Identify missing CHANGELOG
• Detect missing CONTRIBUTING guide
• Check for missing architecture decision records (ADRs)
• Find missing API documentation (OpenAPI/Swagger, protobuf docs)
• Identify missing deployment/operations documentation
• Check for missing LICENSE file

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15. EDGE CASES CHECKLIST

15.1 Input Edge Cases

• Empty strings, slices, maps
• math.MaxInt64, math.MinInt64, overflow boundaries
• Negative numbers where positive expected
• Zero values for all types
• math.NaN() and math.Inf() in float operations
• Unicode characters and emoji in string processing
• Very large inputs (>1GB files, millions of records)
• Deeply nested JSON structures
• Malformed input data (truncated JSON, broken UTF-8)
• Concurrent access from multiple goroutines

15.2 Timing Edge Cases

• Leap years and daylight saving time transitions
• Timezone handling (time.UTC vs time.Local inconsistencies)
• time.Ticker / time.Timer not stopped (goroutine leak)
• Monotonic clock vs wall clock (time.Now() uses monotonic for duration)
• Very old timestamps (before Unix epoch)
• Nanosecond precision issues in comparisons
• time.After() in select statements (creates new channel each iteration — leak)

15.3 Platform Edge Cases

• File path handling across OS (filepath.Join vs path.Join)
• Line ending differences (\n vs \r\n)
• File system case sensitivity differences
• Maximum path length constraints
• Endianness assumptions in binary protocols
• Signal handling differences across OS

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OUTPUT FORMAT

For each issue found, provide:

[SEVERITY: CRITICAL/HIGH/MEDIUM/LOW] Issue Title

Category: [Type Safety/Security/Concurrency/Performance/etc.] File: path/to/file.go Line: 123-145 Impact: Description of what could go wrong

Current Code:

// problematic code

Problem: Detailed explanation of why this is an issue

Recommendation:

// fixed code

References: Links to documentation, Go blog posts, CVEs, best practices

---

PRIORITY MATRIX

1. CRITICAL (Fix Immediately):

   • Security vulnerabilities (injection, auth bypass)
   • Data loss / corruption risks
   • Race conditions causing panics in production
   • Goroutine leaks causing OOM

2. HIGH (Fix This Sprint):

   • Nil pointer dereferences
   • Ignored errors in critical paths
   • Missing context cancellation
   • Resource leaks (connections, file handles)

3. MEDIUM (Fix Soon):

   • Code quality / idiom violations
   • Test coverage gaps
   • Performance issues in non-hot paths
   • Documentation gaps

4. LOW (Tech Debt):

   • Style inconsistencies
   • Minor optimizations
   • Nice-to-have abstractions
   • Naming improvements

---

STATIC ANALYSIS TOOLS TO RUN

Before manual review, run these tools and include findings:

# Compiler checks
go build ./...
go vet ./...

# Race detector
go test -race ./...

# Vulnerability check
govulncheck ./...

# Linter suite (comprehensive)
golangci-lint run --enable-all ./...

# Dead code detection
deadcode ./...

# Unused exports
unused ./...

# Security scanner
gosec ./...

# Complexity analysis
gocyclo -over 15 .

# Escape analysis
go build -gcflags="-m -m" ./... 2>&1 | grep "escapes to heap"

# Test coverage
go test -coverprofile=coverage.out ./...
go tool cover -func=coverage.out

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FINAL SUMMARY

After completing the review, provide:

1. Executive Summary: 2-3 paragraphs overview
2. Risk Assessment: Overall risk level with justification
3. Top 10 Critical Issues: Prioritized list
4. Recommended Action Plan: Phased approach to fixes
5. Estimated Effort: Time estimates for remediation
6. Metrics:
   • Total issues found by severity
   • Code health score (1-10)
   • Security score (1-10)
   • Concurrency safety score (1-10)
   • Maintainability score (1-10)
   • Test coverage percentage