53 lines
1.9 KiB
Python
53 lines
1.9 KiB
Python
"""AST-level concurrency safety injection for Python."""
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import ast
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from typing import Optional
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from app.dataset.rules.base import Mutation, MutationRule
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class ConcurrencyRule(MutationRule):
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"""Remove a threading.Lock.acquire/release pair to introduce race condition.
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Uses `ast` to find a with-statement using a lock and replaces it with the
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bare body, removing synchronization.
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"""
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name = "concurrency"
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language = "python"
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defect_type = "concurrency_issue"
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def detect_and_mutate(self, source: str, filename: str = "") -> Optional[Mutation]:
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try:
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tree = ast.parse(source)
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except SyntaxError:
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return None
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for node in ast.walk(tree):
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if not isinstance(node, ast.With):
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continue
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first_item = node.items[0]
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ctx = first_item.context_expr
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if isinstance(ctx, ast.Call) and isinstance(ctx.func, ast.Attribute) and ctx.func.attr == "acquire":
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start = node.lineno
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end = getattr(node, "end_lineno", node.lineno) or node.lineno
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lines = source.splitlines(keepends=True)
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body = lines[start:end]
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dedented = []
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for line in body[1:]:
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if line.startswith(" "):
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dedented.append(line[4:])
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else:
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dedented.append(line)
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mutated = "".join(lines[: start - 1] + dedented + lines[end:])
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return Mutation(
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defect_type=self.defect_type,
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language=self.language,
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line_start=start,
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line_end=end,
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mutated_source=mutated,
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reference_fix="Restore `with lock:` to protect the critical section.",
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description="Removed lock acquisition, exposing a race condition.",
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)
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return None
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