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refine: tunnel verify - tighter retries, stderr-first on 000, announce DoH fallback

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Reviewer feedback: cut worst-case stall from ~200s to ~60s (urllib 2x, DoH 4x with max-time 10); when curl reports 000 (connect failure) prefer stderr for the diagnostic; print an explicit note when falling back to DoH after a resolved-DNS urllib failure.
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lukehemmin
2026-08-12 20:58:44 +09:00
parent e34322cc73
commit f171ce4992
2 changed files with 14 additions and 6 deletions
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notebooks/luke-scribe-colab.ipynb
+1 -1
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scripts/build_colab_notebook.py
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@@ -302,7 +302,8 @@ def cells() -> list[dict]:
" ext_ok = False\n" " ext_ok = False\n"
" _last_err = None\n" " _last_err = None\n"
" if _dns_ip:\n" " if _dns_ip:\n"
" for _ in range(6):\n" " # DNS가 풀리면 터널도 이미 연결된 상태 — 2회면 충분\n"
" for _ in range(2):\n"
" try:\n" " try:\n"
" ext = urllib.request.urlopen(TUNNEL_URL + '/health', timeout=15)\n" " ext = urllib.request.urlopen(TUNNEL_URL + '/health', timeout=15)\n"
" print(' 외부 접속 검증 OK (HTTP', ext.status, ')')\n" " print(' 외부 접속 검증 OK (HTTP', ext.status, ')')\n"
@@ -312,18 +313,25 @@ def cells() -> list[dict]:
" _last_err = _e\n" " _last_err = _e\n"
" time.sleep(2)\n" " time.sleep(2)\n"
" if not ext_ok and shutil.which('curl'):\n" " if not ext_ok and shutil.which('curl'):\n"
" if _dns_ip:\n"
" print(' (시스템 DNS 경로 실패 — DoH로 우회 검증 시도)')\n"
" # VM DNS 우회: Cloudflare DoH로 호스트 해석 → 터널 직접 접속 (외부와 동일 경로)\n" " # VM DNS 우회: Cloudflare DoH로 호스트 해석 → 터널 직접 접속 (외부와 동일 경로)\n"
" for _ in range(6):\n" " for _ in range(4):\n"
" _c = subprocess.run(\n" " _c = subprocess.run(\n"
" ['curl', '-sS', '-o', '/dev/null', '-w', '%{http_code}', '--max-time', '15',\n" " ['curl', '-sS', '-o', '/dev/null', '-w', '%{http_code}', '--max-time', '10',\n"
" '--doh-url', 'https://cloudflare-dns.com/dns-query', TUNNEL_URL + '/health'],\n" " '--doh-url', 'https://cloudflare-dns.com/dns-query', TUNNEL_URL + '/health'],\n"
" capture_output=True, text=True,\n" " capture_output=True, text=True,\n"
" )\n" " )\n"
" if _c.stdout.strip() == '200':\n" " _code = _c.stdout.strip()\n"
" if _code == '200':\n"
" print(' 외부 접속 검증 OK (DoH 우회, HTTP 200)')\n" " print(' 외부 접속 검증 OK (DoH 우회, HTTP 200)')\n"
" ext_ok = True\n" " ext_ok = True\n"
" break\n" " break\n"
" _last_err = _c.stdout.strip() or _c.stderr.strip() or _last_err\n" " # '000'은 접속 실패 — stderr가 더 설명적\n"
" if _code == '000':\n"
" _last_err = _c.stderr.strip() or _last_err\n"
" else:\n"
" _last_err = _code or _c.stderr.strip() or _last_err\n"
" time.sleep(2)\n" " time.sleep(2)\n"
" if not ext_ok:\n" " if not ext_ok:\n"
" print(' 자동 검증 불가 — 브라우저에서 직접 열어보세요:', TUNNEL_URL + '/docs')\n" " print(' 자동 검증 불가 — 브라우저에서 직접 열어보세요:', TUNNEL_URL + '/docs')\n"