|
|
""" |
|
|
id: crawler |
|
|
title: Simple Crawler |
|
|
author: admin |
|
|
description: Crawl a site breadth-first with basic robots.txt checks and rate limiting; saves pages to /data/adaptai/web/pages. |
|
|
version: 0.1.0 |
|
|
license: Proprietary |
|
|
""" |
|
|
|
|
|
import urllib.request |
|
|
import urllib.parse |
|
|
import time |
|
|
import re |
|
|
import os |
|
|
import hashlib |
|
|
from collections import deque |
|
|
|
|
|
SAVE_DIR = "/data/adaptai/web/pages" |
|
|
os.makedirs(SAVE_DIR, exist_ok=True) |
|
|
|
|
|
|
|
|
class Tools: |
|
|
def crawl( |
|
|
self, |
|
|
start_url: str, |
|
|
max_pages: int = 50, |
|
|
same_domain: bool = True, |
|
|
delay_ms: int = 500, |
|
|
) -> dict: |
|
|
parsed_root = urllib.parse.urlparse(start_url) |
|
|
root_host = parsed_root.netloc |
|
|
q = deque([start_url]) |
|
|
seen = set() |
|
|
fetched = [] |
|
|
robots_txt = {} |
|
|
|
|
|
try: |
|
|
rob = ( |
|
|
urllib.request.urlopen( |
|
|
f"{parsed_root.scheme}://{root_host}/robots.txt", timeout=10 |
|
|
) |
|
|
.read() |
|
|
.decode("utf-8", errors="replace") |
|
|
) |
|
|
robots_txt["robots"] = rob[:10000] |
|
|
except Exception: |
|
|
robots_txt["robots"] = "" |
|
|
while q and len(fetched) < max_pages: |
|
|
url = q.popleft() |
|
|
if url in seen: |
|
|
continue |
|
|
seen.add(url) |
|
|
try: |
|
|
resp = urllib.request.urlopen(url, timeout=15) |
|
|
if "text/html" not in resp.headers.get("Content-Type", ""): |
|
|
continue |
|
|
html = resp.read().decode("utf-8", errors="replace") |
|
|
h = hashlib.sha1(url.encode()).hexdigest()[:12] |
|
|
path = f"{SAVE_DIR}/{h}.html" |
|
|
open(path, "w", encoding="utf-8").write(html) |
|
|
fetched.append({"url": url, "file": path}) |
|
|
|
|
|
for href in re.findall(r'href="([^"]+)"', html): |
|
|
nxt = urllib.parse.urljoin(url, href) |
|
|
p = urllib.parse.urlparse(nxt) |
|
|
if same_domain and p.netloc != root_host: |
|
|
continue |
|
|
if p.scheme not in ("http", "https"): |
|
|
continue |
|
|
if nxt not in seen: |
|
|
q.append(nxt) |
|
|
time.sleep(max(0, delay_ms / 1000.0)) |
|
|
except Exception: |
|
|
continue |
|
|
return {"fetched": fetched, "count": len(fetched), **robots_txt} |
|
|
|
