Add comprehensive docstrings and industry-standard C++ linting

Implemented professional documentation and code quality tools: **Docstrings (Doxygen-style):** - Comprehensive file-level documentation - Class and struct documentation with examples - Function documentation (params, returns, throws) - Member variable inline documentation - Example code blocks - Cross-references **Linting Configuration:** - .clang-tidy - Industry-standard static analysis - bugprone, cert, cppcoreguidelines checks - Google C++ Style Guide compliance - Modern C++ suggestions - Performance optimizations - .clang-format - Automatic code formatting - Based on Google style with customizations - 4-space indentation, 100-char line limit - Consistent pointer/reference alignment **Lint Script (lint.sh):** - Automated quality checks - clang-tidy static analysis - clang-format formatting verification - cppcheck additional analysis - Long function detection - TODO/FIXME tracking - --fix flag for auto-formatting **Documentation:** - README.Linting.md - Complete linting guide - Tool installation - Usage examples - Pre-commit hooks - IDE integration (VSCode, CLion) - Common issues and fixes - CI/CD integration **Standards:** - Naming conventions enforced - C++ Core Guidelines compliance - Secure coding (CERT guidelines) - Readability and maintainability - Performance best practices Production-grade code quality infrastructure. Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>
2026-05-01 01:05:00 +00:00 · 2025-12-25 00:49:56 +00:00
parent 792475ef35
commit 61d6558ace
6 changed files with 804 additions and 20 deletions
--- a/dbal/cpp/.clang-format
+++ b/dbal/cpp/.clang-format
@@ -0,0 +1,60 @@
+# clang-format configuration for DBAL C++ project
+# Based on Google C++ Style Guide with minor modifications
+
+# Base style
+BasedOnStyle: Google
+
+# Language
+Language: Cpp
+Standard: c++17
+
+# Indentation
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+NamespaceIndentation: None
+
+# Line length
+ColumnLimit: 100
+
+# Braces
+BreakBeforeBraces: Attach
+
+# Pointers and references
+DerivePointerAlignment: false
+PointerAlignment: Left
+
+# Include sorting
+SortIncludes: CaseInsensitive
+IncludeBlocks: Regroup
+
+# Comments
+ReflowComments: true
+SpacesBeforeTrailingComments: 2
+
+# Alignment
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignOperands: true
+AlignTrailingComments: true
+
+# Function parameters
+AllowAllParametersOfDeclarationOnNextLine: true
+BinPackParameters: false
+
+# Penalties (for line breaking decisions)
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+
+# Other
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
--- a/dbal/cpp/.clang-tidy
+++ b/dbal/cpp/.clang-tidy
@@ -0,0 +1,63 @@
+# clang-tidy configuration for DBAL C++ project
+# Industry-standard C++ linting with modern best practices
+
+# Enable comprehensive checks
+Checks: >
+  -*,
+  bugprone-*,
+  cert-*,
+  clang-analyzer-*,
+  cppcoreguidelines-*,
+  google-*,
+  hicpp-*,
+  llvm-*,
+  misc-*,
+  modernize-*,
+  performance-*,
+  portability-*,
+  readability-*,
+  -modernize-use-trailing-return-type,
+  -readability-magic-numbers,
+  -cppcoreguidelines-avoid-magic-numbers,
+  -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+  -cppcoreguidelines-owning-memory,
+  -hicpp-no-array-decay,
+  -cppcoreguidelines-pro-type-vararg,
+  -hicpp-vararg,
+  -google-readability-todo,
+  -llvm-header-guard,
+  -llvm-include-order,
+  -misc-non-private-member-variables-in-classes,
+  -readability-identifier-length
+
+# Check options
+CheckOptions:
+  - key: readability-identifier-naming.ClassCase
+    value: CamelCase
+  - key: readability-identifier-naming.FunctionCase
+    value: camelCase
+  - key: readability-identifier-naming.VariableCase
+    value: lower_case
+  - key: readability-identifier-naming.ConstantCase
+    value: UPPER_CASE
+  - key: readability-identifier-naming.ParameterCase
+    value: lower_case
+  - key: readability-identifier-naming.NamespaceCase
+    value: lower_case
+  - key: readability-identifier-naming.EnumCase
+    value: CamelCase
+  - key: readability-identifier-naming.MemberCase
+    value: lower_case_
+  - key: readability-function-cognitive-complexity.Threshold
+    value: '25'
+  - key: readability-function-size.StatementThreshold
+    value: '100'
+  - key: misc-non-private-member-variables-in-classes.IgnoreClassesWithAllMemberVariablesBeingPublic
+    value: '1'
+
+# Header filter - only check our code
+HeaderFilterRegex: '(dbal/cpp/include|dbal/cpp/src)/.*'
+
+# Use C++17
+WarningsAsErrors: ''
+FormatStyle: google
--- a/dbal/cpp/README.Linting.md
+++ b/dbal/cpp/README.Linting.md
@@ -0,0 +1,316 @@
+# C++ Code Quality and Linting Guide
+
+## Overview
+
+The DBAL C++ project uses industry-standard tools for maintaining code quality:
+
+- **clang-tidy**: Static analysis and linting
+- **clang-format**: Code formatting
+- **cppcheck**: Additional static analysis
+- **Doxygen**: Documentation generation
+
+## Quick Start
+
+### Run All Checks
+
+```bash
+cd dbal/cpp
+./lint.sh
+```
+
+### Apply Automatic Fixes
+
+```bash
+./lint.sh --fix
+```
+
+## Tools
+
+### 1. clang-tidy
+
+**Purpose**: Static analysis, best practices enforcement, modern C++ suggestions
+
+**Configuration**: `.clang-tidy`
+
+**Enabled Checks**:
+- `bugprone-*` - Potential bugs
+- `cert-*` - CERT secure coding guidelines
+- `clang-analyzer-*` - Clang static analyzer
+- `cppcoreguidelines-*` - C++ Core Guidelines
+- `google-*` - Google C++ Style Guide
+- `modernize-*` - Modern C++ suggestions
+- `performance-*` - Performance improvements
+- `readability-*` - Code readability
+
+**Usage**:
+```bash
+# Single file
+clang-tidy src/daemon/server.cpp -p build/
+
+# All files
+find src -name "*.cpp" | xargs clang-tidy -p build/
+```
+
+### 2. clang-format
+
+**Purpose**: Automatic code formatting
+
+**Configuration**: `.clang-format`
+
+**Style**: Based on Google C++ Style Guide with customizations:
+- 4-space indentation
+- 100 character line limit
+- Attach braces
+- Pointer/reference alignment: left
+
+**Usage**:
+```bash
+# Check formatting
+clang-format --dry-run --Werror src/daemon/server.cpp
+
+# Apply formatting
+clang-format -i src/daemon/server.cpp
+
+# Format all files
+find src include -name "*.cpp" -o -name "*.hpp" | xargs clang-format -i
+```
+
+### 3. cppcheck
+
+**Purpose**: Additional static analysis for potential bugs
+
+**Usage**:
+```bash
+cppcheck --enable=all \
+         --suppress=missingIncludeSystem \
+         --std=c++17 \
+         -I include \
+         src/
+```
+
+### 4. Doxygen
+
+**Purpose**: Generate HTML documentation from code comments
+
+**Style**: Javadoc-style comments
+
+**Example**:
+```cpp
+/**
+ * @brief Brief description
+ *
+ * Detailed description of the function or class.
+ *
+ * @param param1 Description of parameter
+ * @param param2 Description of parameter
+ * @return Description of return value
+ * @throws Error Description of when error is thrown
+ *
+ * @example
+ * @code
+ * auto result = myFunction(42, "test");
+ * if (result.isOk()) {
+ *     std::cout << result.value();
+ * }
+ * @endcode
+ */
+Result<int> myFunction(int param1, const std::string& param2);
+```
+
+**Generate docs**:
+```bash
+doxygen Doxyfile
+```
+
+## Documentation Standards
+
+### File Headers
+
+Every source file should have a file-level docstring:
+
+```cpp
+/**
+ * @file filename.cpp
+ * @brief Brief description of file purpose
+ *
+ * Detailed description of what this file contains,
+ * its role in the system, and any important notes.
+ */
+```
+
+### Class Documentation
+
+```cpp
+/**
+ * @class ClassName
+ * @brief Brief description of class purpose
+ *
+ * Detailed description of the class, its responsibilities,
+ * and how it should be used.
+ *
+ * @example
+ * @code
+ * ClassName obj(param1, param2);
+ * obj.doSomething();
+ * @endcode
+ */
+class ClassName {
+    // ...
+};
+```
+
+### Function Documentation
+
+```cpp
+/**
+ * @brief Brief description of what function does
+ *
+ * Detailed description including algorithm details,
+ * preconditions, postconditions, and side effects.
+ *
+ * @param param1 Description of first parameter
+ * @param param2 Description of second parameter
+ * @return Description of return value
+ * @throws ErrorType When this error occurs
+ *
+ * @note Special notes or caveats
+ * @warning Important warnings
+ * @see Related functions or classes
+ */
+Result<ReturnType> functionName(Type1 param1, Type2 param2);
+```
+
+### Member Variables
+
+```cpp
+class MyClass {
+private:
+    int counter_;         ///< Brief description of member
+    std::string name_;    ///< Brief description of member
+};
+```
+
+## Naming Conventions
+
+Enforced by clang-tidy configuration:
+
+- **Classes/Structs**: `CamelCase`
+- **Functions**: `camelCase`
+- **Variables**: `lower_case`
+- **Constants**: `UPPER_CASE`
+- **Member variables**: `lower_case_` (trailing underscore)
+- **Namespaces**: `lower_case`
+
+## Pre-commit Hooks
+
+To automatically run linting before commits:
+
+```bash
+# Create pre-commit hook
+cat > .git/hooks/pre-commit << 'EOF'
+#!/bin/bash
+cd dbal/cpp
+./lint.sh
+if [ $? -ne 0 ]; then
+    echo "Linting failed. Fix issues or use git commit --no-verify to skip."
+    exit 1
+fi
+EOF
+
+chmod +x .git/hooks/pre-commit
+```
+
+## IDE Integration
+
+### VSCode
+
+Install extensions:
+- **C/C++** (Microsoft)
+- **clangd**
+- **Clang-Format**
+
+Settings (`.vscode/settings.json`):
+```json
+{
+    "clang-format.executable": "/usr/bin/clang-format",
+    "clang-format.style": "file",
+    "editor.formatOnSave": true,
+    "C_Cpp.codeAnalysis.clangTidy.enabled": true,
+    "C_Cpp.codeAnalysis.clangTidy.path": "/usr/bin/clang-tidy"
+}
+```
+
+### CLion
+
+Settings → Editor → Code Style → C/C++:
+- Scheme: Set from file (.clang-format)
+
+Settings → Editor → Inspections → C/C++:
+- Enable "Clang-Tidy"
+- Configuration file: .clang-tidy
+
+## Continuous Integration
+
+Add to GitHub Actions workflow:
+
+```yaml
+- name: Lint C++ Code
+  run: |
+    cd dbal/cpp
+    ./lint.sh
+```
+
+## Common Issues and Fixes
+
+### Issue: "Use of old-style cast"
+```cpp
+// Bad
+int x = (int)value;
+
+// Good
+int x = static_cast<int>(value);
+```
+
+### Issue: "Variable never read"
+```cpp
+// Bad
+int unused = 42;
+
+// Good
+[[maybe_unused]] int for_future_use = 42;
+```
+
+### Issue: "Missing const"
+```cpp
+// Bad
+std::string getName() { return name_; }
+
+// Good
+std::string getName() const { return name_; }
+```
+
+### Issue: "Pass by value instead of const reference"
+```cpp
+// Bad
+void setName(std::string name) { name_ = name; }
+
+// Good
+void setName(const std::string& name) { name_ = name; }
+```
+
+## Metrics
+
+The lint script reports:
+- Formatting violations
+- Static analysis warnings
+- TODO/FIXME comments count
+- Long functions (>100 lines)
+
+Aim for zero warnings before committing.
+
+## Resources
+
+- [C++ Core Guidelines](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines)
+- [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html)
+- [clang-tidy checks](https://clang.llvm.org/extra/clang-tidy/checks/list.html)
+- [Doxygen manual](https://www.doxygen.nl/manual/)
--- a/dbal/cpp/include/dbal/errors.hpp
+++ b/dbal/cpp/include/dbal/errors.hpp
@@ -1,3 +1,11 @@
+/**
+ * @file errors.hpp
+ * @brief Error handling types and utilities for DBAL
+ *
+ * Provides comprehensive error handling with typed error codes,
+ * factory methods, and Result<T> monad for functional error handling.
+ */
+
 #ifndef DBAL_ERRORS_HPP
 #define DBAL_ERRORS_HPP

@@ -7,74 +15,226 @@

 namespace dbal {

+/**
+ * @enum ErrorCode
+ * @brief HTTP-aligned error codes for consistent error handling
+ *
+ * Error codes map to HTTP status codes for easy integration with
+ * REST APIs and web services. Each code represents a specific
+ * failure category with well-defined semantics.
+ */
 enum class ErrorCode {
-    NotFound = 404,
-    Conflict = 409,
-    Unauthorized = 401,
-    Forbidden = 403,
-    ValidationError = 422,
-    RateLimitExceeded = 429,
-    InternalError = 500,
-    Timeout = 504,
-    DatabaseError = 503,
-    CapabilityNotSupported = 501,
-    SandboxViolation = 403,
-    MaliciousCodeDetected = 403
+    NotFound = 404,                  ///< Resource not found
+    Conflict = 409,                  ///< Resource conflict (e.g., duplicate key)
+    Unauthorized = 401,              ///< Authentication required
+    Forbidden = 403,                 ///< Access forbidden (insufficient permissions)
+    ValidationError = 422,           ///< Input validation failed
+    RateLimitExceeded = 429,         ///< Too many requests (quota exceeded)
+    InternalError = 500,             ///< Internal server error
+    Timeout = 504,                   ///< Operation timed out
+    DatabaseError = 503,             ///< Database unavailable
+    CapabilityNotSupported = 501,    ///< Feature not supported
+    SandboxViolation = 403,          ///< Sandbox security violation
+    MaliciousCodeDetected = 403      ///< Malicious code detected
 };

+/**
+ * @class Error
+ * @brief Exception class with typed error codes
+ *
+ * Provides structured error handling with HTTP-aligned status codes
+ * and factory methods for common error scenarios. Derives from
+ * std::runtime_error for compatibility with standard exception handling.
+ *
+ * @example
+ * @code
+ * // Throw specific error
+ * throw Error::notFound("User not found");
+ *
+ * // Check error code
+ * try {
+ *     // operation
+ * } catch (const Error& e) {
+ *     if (e.code() == ErrorCode::NotFound) {
+ *         // handle not found
+ *     }
+ * }
+ * @endcode
+ */
 class Error : public std::runtime_error {
 public:
+    /**
+     * @brief Construct error with code and message
+     * @param code HTTP-aligned error code
+     * @param message Human-readable error message
+     */
    Error(ErrorCode code, const std::string& message)
        : std::runtime_error(message), code_(code) {}

+    /**
+     * @brief Get the error code
+     * @return ErrorCode indicating error type
+     */
    ErrorCode code() const { return code_; }

+    /**
+     * @brief Factory for NotFound errors (404)
+     * @param message Optional custom message
+     * @return Error instance
+     */
    static Error notFound(const std::string& message = "Resource not found");
+
+    /**
+     * @brief Factory for Conflict errors (409)
+     * @param message Optional custom message
+     * @return Error instance
+     */
    static Error conflict(const std::string& message = "Resource conflict");
+
+    /**
+     * @brief Factory for Unauthorized errors (401)
+     * @param message Optional custom message
+     * @return Error instance
+     */
    static Error unauthorized(const std::string& message = "Authentication required");
+
+    /**
+     * @brief Factory for Forbidden errors (403)
+     * @param message Optional custom message
+     * @return Error instance
+     */
    static Error forbidden(const std::string& message = "Access forbidden");
+
+    /**
+     * @brief Factory for ValidationError (422)
+     * @param message Validation failure details
+     * @return Error instance
+     */
    static Error validationError(const std::string& message);
+
+    /**
+     * @brief Factory for InternalError (500)
+     * @param message Optional custom message
+     * @return Error instance
+     */
    static Error internal(const std::string& message = "Internal server error");
+
+    /**
+     * @brief Factory for SandboxViolation errors
+     * @param message Violation details
+     * @return Error instance
+     */
    static Error sandboxViolation(const std::string& message);
+
+    /**
+     * @brief Factory for MaliciousCodeDetected errors
+     * @param message Detection details
+     * @return Error instance
+     */
    static Error maliciousCode(const std::string& message);

 private:
-    ErrorCode code_;
+    ErrorCode code_;  ///< Error code
 };

+/**
+ * @class Result
+ * @brief Functional error handling monad (Railway-Oriented Programming)
+ *
+ * Result<T> represents either a successful value (Ok) or an error (Err).
+ * This enables explicit error handling without exceptions for performance-
+ * critical code paths.
+ *
+ * @tparam T The success value type
+ *
+ * @example
+ * @code
+ * Result<User> getUser(int id) {
+ *     if (user_exists(id)) {
+ *         return User{id, "John"};  // Ok
+ *     }
+ *     return Error::notFound("User not found");  // Err
+ * }
+ *
+ * auto result = getUser(123);
+ * if (result.isOk()) {
+ *     std::cout << result.value().name;
+ * } else {
+ *     std::cerr << result.error().what();
+ * }
+ * @endcode
+ */
 template<typename T>
 class Result {
 public:
+    /**
+     * @brief Construct successful result with value
+     * @param value Success value
+     */
    Result(T value) : value_(std::move(value)), has_value_(true) {}
+
+    /**
+     * @brief Construct error result
+     * @param error Error instance
+     */
    Result(Error error) : error_(std::move(error)), has_value_(false) {}

+    /**
+     * @brief Check if result contains value
+     * @return true if Ok, false if Err
+     */
    bool isOk() const { return has_value_; }
+
+    /**
+     * @brief Check if result contains error
+     * @return true if Err, false if Ok
+     */
    bool isError() const { return !has_value_; }

+    /**
+     * @brief Get mutable reference to value
+     * @return Value reference
+     * @throws Error if result is Err
+     */
    T& value() {
        if (!has_value_) throw error_;
        return value_;
    }

+    /**
+     * @brief Get const reference to value
+     * @return Value reference
+     * @throws Error if result is Err
+     */
    const T& value() const {
        if (!has_value_) throw error_;
        return value_;
    }

+    /**
+     * @brief Get mutable reference to error
+     * @return Error reference
+     * @throws std::logic_error if result is Ok
+     */
    Error& error() {
        if (has_value_) throw std::logic_error("No error present");
        return error_;
    }

+    /**
+     * @brief Get const reference to error
+     * @return Error reference
+     * @throws std::logic_error if result is Ok
+     */
    const Error& error() const {
        if (has_value_) throw std::logic_error("No error present");
        return error_;
    }

 private:
-    T value_;
-    Error error_{ErrorCode::InternalError, ""};
-    bool has_value_;
+    T value_;          ///< Success value (if has_value_ == true)
+    Error error_{ErrorCode::InternalError, ""};  ///< Error (if has_value_ == false)
+    bool has_value_;   ///< true if Ok, false if Err
 };

 }
--- a/dbal/cpp/lint.sh
+++ b/dbal/cpp/lint.sh
@@ -0,0 +1,165 @@
+#!/bin/bash
+
+# DBAL C++ Linting and Formatting Script
+# Uses industry-standard tools: clang-tidy, clang-format, cppcheck
+
+set -e
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo "========================================="
+echo "DBAL C++ Code Quality Check"
+echo "========================================="
+echo ""
+
+# Check if tools are installed
+MISSING_TOOLS=()
+
+if ! command -v clang-tidy &> /dev/null; then
+    MISSING_TOOLS+=("clang-tidy")
+fi
+
+if ! command -v clang-format &> /dev/null; then
+    MISSING_TOOLS+=("clang-format")
+fi
+
+if ! command -v cppcheck &> /dev/null; then
+    MISSING_TOOLS+=("cppcheck")
+fi
+
+if [ ${#MISSING_TOOLS[@]} -ne 0 ]; then
+    echo -e "${YELLOW}Warning: Missing tools: ${MISSING_TOOLS[*]}${NC}"
+    echo "Install with:"
+    echo "  Ubuntu/Debian: sudo apt-get install clang-tidy clang-format cppcheck"
+    echo "  macOS: brew install llvm cppcheck"
+    echo ""
+fi
+
+# Change to cpp directory
+cd "$(dirname "$0")"
+
+# Function to print section header
+print_section() {
+    echo ""
+    echo "========================================="
+    echo "$1"
+    echo "========================================="
+}
+
+# 1. clang-format (code formatting)
+if command -v clang-format &> /dev/null; then
+    print_section "1. Running clang-format (code formatting)"
+    
+    # Check if --fix flag is provided
+    if [ "$1" == "--fix" ]; then
+        echo "Applying formatting fixes..."
+        find src include -name "*.cpp" -o -name "*.hpp" -o -name "*.h" | \
+            xargs clang-format -i --style=file
+        echo -e "${GREEN}✓ Formatting applied${NC}"
+    else
+        echo "Checking formatting (use --fix to apply)..."
+        FORMAT_ISSUES=$(find src include -name "*.cpp" -o -name "*.hpp" -o -name "*.h" | \
+            xargs clang-format --dry-run --Werror --style=file 2>&1 || true)
+        
+        if [ -n "$FORMAT_ISSUES" ]; then
+            echo -e "${YELLOW}⚠ Formatting issues found:${NC}"
+            echo "$FORMAT_ISSUES"
+        else
+            echo -e "${GREEN}✓ All files properly formatted${NC}"
+        fi
+    fi
+else
+    echo -e "${YELLOW}⚠ clang-format not found, skipping${NC}"
+fi
+
+# 2. clang-tidy (static analysis)
+if command -v clang-tidy &> /dev/null; then
+    print_section "2. Running clang-tidy (static analysis)"
+    
+    # Build compile_commands.json if it doesn't exist
+    if [ ! -f build/compile_commands.json ]; then
+        echo "Generating compile_commands.json..."
+        mkdir -p build
+        cd build
+        cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON ..
+        cd ..
+    fi
+    
+    echo "Analyzing source files..."
+    TIDY_ISSUES=0
+    
+    # Run clang-tidy on all source files
+    find src -name "*.cpp" | while read -r file; do
+        echo "Checking $file..."
+        if ! clang-tidy "$file" -p build/ --quiet 2>&1; then
+            TIDY_ISSUES=$((TIDY_ISSUES + 1))
+        fi
+    done
+    
+    if [ $TIDY_ISSUES -eq 0 ]; then
+        echo -e "${GREEN}✓ No issues found${NC}"
+    else
+        echo -e "${YELLOW}⚠ Found $TIDY_ISSUES files with issues${NC}"
+    fi
+else
+    echo -e "${YELLOW}⚠ clang-tidy not found, skipping${NC}"
+fi
+
+# 3. cppcheck (additional static analysis)
+if command -v cppcheck &> /dev/null; then
+    print_section "3. Running cppcheck (additional analysis)"
+    
+    cppcheck --enable=all \
+             --suppress=missingIncludeSystem \
+             --suppress=unusedFunction \
+             --quiet \
+             --std=c++17 \
+             -I include \
+             src/ 2>&1 | tee cppcheck-report.txt
+    
+    if [ -s cppcheck-report.txt ]; then
+        echo -e "${YELLOW}⚠ Issues found (see cppcheck-report.txt)${NC}"
+    else
+        echo -e "${GREEN}✓ No issues found${NC}"
+        rm -f cppcheck-report.txt
+    fi
+else
+    echo -e "${YELLOW}⚠ cppcheck not found, skipping${NC}"
+fi
+
+# 4. Check for common issues
+print_section "4. Checking for common issues"
+
+echo "Checking for TODO/FIXME comments..."
+TODO_COUNT=$(grep -r "TODO\|FIXME" src/ include/ || true | wc -l)
+if [ "$TODO_COUNT" -gt 0 ]; then
+    echo -e "${YELLOW}⚠ Found $TODO_COUNT TODO/FIXME comments${NC}"
+    grep -rn "TODO\|FIXME" src/ include/ || true
+else
+    echo -e "${GREEN}✓ No TODO/FIXME comments${NC}"
+fi
+
+echo ""
+echo "Checking for long functions (>100 lines)..."
+LONG_FUNCTIONS=$(awk '/^[[:space:]]*[a-zA-Z_].*\(.*\).*\{/{count=0; name=$0}
+                     {count++}
+                     /^[[:space:]]*\}/{if(count>100) print FILENAME":"NR" "name" ("count" lines)"}' \
+                     $(find src -name "*.cpp") || true)
+if [ -n "$LONG_FUNCTIONS" ]; then
+    echo -e "${YELLOW}⚠ Long functions found:${NC}"
+    echo "$LONG_FUNCTIONS"
+else
+    echo -e "${GREEN}✓ No overly long functions${NC}"
+fi
+
+# Summary
+print_section "Summary"
+echo "Linting complete!"
+echo ""
+echo "To fix formatting issues, run: ./lint.sh --fix"
+echo "For detailed analysis, check the generated reports."
+echo ""
--- a/dbal/cpp/src/daemon/server.cpp
+++ b/dbal/cpp/src/daemon/server.cpp
@@ -1,3 +1,15 @@
+/**
+ * @file server.cpp
+ * @brief Cross-platform HTTP/1.1 server implementation with nginx reverse proxy support
+ *
+ * Provides a production-ready HTTP server with:
+ * - Cross-platform socket support (Windows/Linux/macOS)
+ * - Multi-threaded request handling
+ * - Nginx reverse proxy header parsing
+ * - Health check endpoints
+ * - Graceful shutdown
+ */
+
 #include <string>
 #include <thread>
 #include <vector>
@@ -43,11 +55,19 @@
 namespace dbal {
 namespace daemon {

+/**
+ * @struct HttpRequest
+ * @brief Parsed HTTP request structure
+ *
+ * Contains all components of an HTTP request including method,
+ * path, version, and headers. Used internally for request processing.
+ */
 struct HttpRequest {
-    std::string method;
-    std::string path;
-    std::string version;
-    std::map<std::string, std::string> headers;
+    std::string method;   ///< HTTP method (GET, POST, etc.)
+    std::string path;     ///< Request path (e.g., /api/health)
+    std::string version;  ///< HTTP version (e.g., HTTP/1.1)
+    std::map<std::string, std::string> headers;  ///< Request headers
+};
    std::string body;
    
    // Nginx reverse proxy headers