import os import ast from typing import List, Optional from pydantic import BaseModel, Field import orjson # --- Pydantic V2 Models for Data Validation --- class ConnectionLeakIssue(BaseModel): file_path: str = Field(..., description="Path to the analyzed file") line_number: int = Field(..., description="Line number where the issue was detected") message: str = Field(..., description="Detailed description of the detected issue") severity: str = Field(..., description="Severity level (WARNING / ERROR)") class AnalysisReport(BaseModel): total_files_scanned: int = Field(..., description="Total number of files scanned") issues_found: List[ConnectionLeakIssue] = Field( default_factory=list, description="List of potential connection leak locations detected" ) # --- SQLAlchemy Connection Pool Leak Static Analyzer --- class SQLAlchemyLeakDetector(ast.NodeVisitor): """ Static analyzer that detects SQLAlchemy sessions not properly closed via a try-finally block or a context manager (with statement). """ def __init__(self, file_path: str): self.file_path = file_path self.issues: List[ConnectionLeakIssue] = [] def visit_FunctionDef(self, node: ast.FunctionDef): has_session_creation = False has_try_finally = False has_context_manager = False session_var_name = None session_line = 0 for child in ast.walk(node): # Detect assignments such as: session = Session() or db = SessionLocal() if isinstance(child, ast.Assign): for target in child.targets: if isinstance(target, ast.Name) and any(kw in target.id.lower() for kw in ["session", "db"]): if isinstance(child.value, ast.Call): has_session_creation = True session_var_name = target.id session_line = child.lineno # Verify presence of a try-finally block calling close() if isinstance(child, ast.Try): if child.finalbody: for final_child in ast.walk(ast.Module(body=child.finalbody, type_ignores=[])): if isinstance(final_child, ast.Call) and isinstance(final_child.func, ast.Attribute): if final_child.func.attr == "close": has_try_finally = True # Verify presence of a context manager (with statement) if isinstance(child, ast.With): for item in child.items: if isinstance(item.context_expr, ast.Call): has_context_manager = True if has_session_creation and not has_try_finally and not has_context_manager: self.issues.append( ConnectionLeakIssue( file_path=self.file_path, line_number=session_line, message=( f"Variable '{session_var_name}' is instantiated without lifecycle " f"management via try-finally or a context manager (with). " f"This can lead to connection pool exhaustion." ), severity="ERROR" ) ) self.generic_visit(node) def analyze_source_code(file_path: str, source_code: str) -> List[ConnectionLeakIssue]: """Parse the given source code string and run static analysis.""" try: tree = ast.parse(source_code, filename=file_path) except SyntaxError as e: return [ ConnectionLeakIssue( file_path=file_path, line_number=e.lineno or 0, message=f"Failed to parse due to syntax error: {e.msg}", severity="WARNING" ) ] detector = SQLAlchemyLeakDetector(file_path) detector.visit(tree) return detector.issues # --- Demonstration of Execution and orjson Serialization --- if __name__ == "__main__": vulnerable_code = """ from sqlalchemy.orm import sessionmaker SessionLocal = sessionmaker(bind=some_engine) def bad_query_handler(): db = SessionLocal() user = db.query(User).filter_by(id=1).first() return user """ safe_code = """ from sqlalchemy.orm import sessionmaker SessionLocal = sessionmaker(bind=some_engine) def good_query_handler(): with SessionLocal() as db: user = db.query(User).filter_by(id=1).first() return user """ detected_issues = [] detected_issues.extend(analyze_source_code("vulnerable_app.py", vulnerable_code)) detected_issues.extend(analyze_source_code("safe_app.py", safe_code)) report = AnalysisReport( total_files_scanned=2, issues_found=detected_issues ) json_output = orjson.dumps( report.model_dump(), option=orjson.OPT_INDENT_2 | orjson.OPT_NON_STR_KEYS ) print(json_output.decode("utf-8")) 

{ "total_files_scanned": 2, "issues_found": [ { "file_path": "vulnerable_app.py", "line_number": 6, "message": "Variable 'db' is instantiated without lifecycle management via try-finally or a context manager (with). This can lead to connection pool exhaustion.", "severity": "ERROR" } ] } 

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