spring-boot-demo-oom: five real memory-leak demos with captured OOM + MAT evidence

2026-10-01 12:11:56 +00:00
commit fd035a79e8
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+#!/usr/bin/env python3
+"""Extracts MAT's "Problem Suspect 1" paragraph from a heap_Leak_Suspects.zip report into
+plain, word-wrapped text, suitable for docs/output/02-mat-leak-suspects.txt.
+
+Usage: extract-mat-summary.py <module-dir>
+Expects <module-dir>/docs/output/heap_Leak_Suspects.zip to exist (produced by mat-report.sh).
+"""
+import sys
+import re
+import html
+import textwrap
+import zipfile
+import tempfile
+import os
+
+def main(mod_dir: str) -> None:
+    zpath = os.path.join(mod_dir, "docs", "output", "heap_Leak_Suspects.zip")
+    out_path = os.path.join(mod_dir, "docs", "output", "02-mat-leak-suspects.txt")
+    with tempfile.TemporaryDirectory() as td:
+        with zipfile.ZipFile(zpath) as zf:
+            zf.extract("index.html", td)
+        content = open(os.path.join(td, "index.html"), encoding="utf-8", errors="ignore").read()
+
+    starts = [m.start() for m in re.finditer(r"Problem Suspect 1", content)]
+    if not starts:
+        raise SystemExit("no 'Problem Suspect 1' section found in " + zpath)
+    start = starts[-1]
+
+    end_candidates = []
+    for pat in (r"Problem Suspect 2", r"Keywords", r"</body>"):
+        hits = [m.start() for m in re.finditer(pat, content) if m.start() > start]
+        if hits:
+            end_candidates.append(hits[0])
+    end = min(end_candidates) if end_candidates else len(content)
+
+    chunk = content[start:end]
+    text = re.sub("<[^>]+>", " ", chunk)
+    text = html.unescape(text)
+    text = re.sub(r"[ \t]+", " ", text)
+    text = re.sub(r" *\n *", "\n", text).strip()
+    wrapped = "\n".join(textwrap.wrap(text, width=96))
+
+    header = (
+        "Eclipse MAT 1.17.0 batch report (org.eclipse.mat.api:suspects) on heap.hprof "
+        "-- Problem Suspect 1\n" + "=" * 96 + "\n\n"
+    )
+    with open(out_path, "w") as f:
+        f.write(header + wrapped + "\n")
+    print("wrote", out_path)
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        raise SystemExit("usage: extract-mat-summary.py <module-dir>")
+    main(sys.argv[1])