280 lines
9 KiB
Python
280 lines
9 KiB
Python
#!/usr/bin/env python3
|
|
|
|
import asyncio
|
|
import json
|
|
import re
|
|
import sys
|
|
from typing import Any
|
|
|
|
import httpx
|
|
from scrapling.fetchers import StealthyFetcher
|
|
|
|
from .base import BaseScraper
|
|
from .models import (
|
|
ContestListResult,
|
|
ContestSummary,
|
|
MetadataResult,
|
|
ProblemSummary,
|
|
TestCase,
|
|
TestsResult,
|
|
)
|
|
|
|
BASE_URL = "https://www.codechef.com"
|
|
API_CONTESTS_ALL = "/api/list/contests/all"
|
|
API_CONTEST = "/api/contests/{contest_id}"
|
|
API_PROBLEM = "/api/contests/{contest_id}/problems/{problem_id}"
|
|
PROBLEM_URL = "https://www.codechef.com/problems/{problem_id}"
|
|
|
|
HEADERS = {
|
|
"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
|
|
}
|
|
TIMEOUT_S = 15.0
|
|
CONNECTIONS = 8
|
|
|
|
MEMORY_LIMIT_RE = re.compile(r"Memory\s+[Ll]imit[:\s]+([0-9.]+)\s*MB", re.IGNORECASE)
|
|
|
|
|
|
async def fetch_json(client: httpx.AsyncClient, path: str) -> dict:
|
|
r = await client.get(BASE_URL + path, headers=HEADERS, timeout=TIMEOUT_S)
|
|
r.raise_for_status()
|
|
return r.json()
|
|
|
|
|
|
def _extract_memory_limit(html: str) -> float:
|
|
m = MEMORY_LIMIT_RE.search(html)
|
|
return float(m.group(1)) if m else 256.0
|
|
|
|
|
|
def _fetch_html_sync(url: str) -> str:
|
|
response = StealthyFetcher.fetch(url, headless=True, network_idle=True)
|
|
return str(response.body)
|
|
|
|
|
|
def get_div4_contest_id(contest_id: str) -> str:
|
|
return f"{contest_id}D"
|
|
|
|
|
|
class CodeChefScraper(BaseScraper):
|
|
@property
|
|
def platform_name(self) -> str:
|
|
return "codechef"
|
|
|
|
async def scrape_contest_metadata(self, contest_id: str) -> MetadataResult:
|
|
div4_id = get_div4_contest_id(contest_id)
|
|
async with httpx.AsyncClient() as client:
|
|
try:
|
|
data = await fetch_json(client, API_CONTEST.format(contest_id=div4_id))
|
|
except httpx.HTTPStatusError as e:
|
|
return self._create_metadata_error(
|
|
f"Failed to fetch contest {contest_id}: {e}", contest_id
|
|
)
|
|
|
|
if not data.get("problems"):
|
|
return self._create_metadata_error(
|
|
f"No problems found for contest {contest_id}", contest_id
|
|
)
|
|
|
|
problems = []
|
|
for problem_code, problem_data in data["problems"].items():
|
|
problems.append(
|
|
ProblemSummary(
|
|
id=problem_code,
|
|
name=problem_data.get("name", problem_code),
|
|
)
|
|
)
|
|
|
|
return MetadataResult(
|
|
success=True,
|
|
error="",
|
|
contest_id=contest_id,
|
|
problems=problems,
|
|
url=f"{BASE_URL}/{contest_id}",
|
|
)
|
|
|
|
async def scrape_contest_list(self) -> ContestListResult:
|
|
async with httpx.AsyncClient() as client:
|
|
try:
|
|
data = await fetch_json(client, API_CONTESTS_ALL)
|
|
except httpx.HTTPStatusError as e:
|
|
return self._create_contests_error(f"Failed to fetch contests: {e}")
|
|
|
|
all_contests = data.get("future_contests", []) + data.get("past_contests", [])
|
|
|
|
max_num = 0
|
|
contest_names = {}
|
|
|
|
for contest in all_contests:
|
|
contest_code = contest.get("contest_code", "")
|
|
if contest_code.startswith("START"):
|
|
match = re.match(r"START(\d+)", contest_code)
|
|
if match:
|
|
num = int(match.group(1))
|
|
max_num = max(max_num, num)
|
|
contest_names[contest_code] = contest.get(
|
|
"contest_name", contest_code
|
|
)
|
|
|
|
if max_num == 0:
|
|
return self._create_contests_error("No Starters contests found")
|
|
|
|
contests = []
|
|
for i in range(1, max_num + 1):
|
|
contest_id = f"START{i}"
|
|
name = contest_names.get(contest_id, f"Starters {i}")
|
|
contests.append(
|
|
ContestSummary(
|
|
id=contest_id,
|
|
name=name,
|
|
display_name=name,
|
|
)
|
|
)
|
|
|
|
return ContestListResult(success=True, error="", contests=contests)
|
|
|
|
async def stream_tests_for_category_async(self, contest_id: str) -> None:
|
|
div4_id = get_div4_contest_id(contest_id)
|
|
|
|
async with httpx.AsyncClient(
|
|
limits=httpx.Limits(max_connections=CONNECTIONS)
|
|
) as client:
|
|
try:
|
|
contest_data = await fetch_json(
|
|
client, API_CONTEST.format(contest_id=div4_id)
|
|
)
|
|
except Exception:
|
|
return
|
|
|
|
problems = contest_data.get("problems", {})
|
|
if not problems:
|
|
return
|
|
|
|
sem = asyncio.Semaphore(CONNECTIONS)
|
|
|
|
async def run_one(problem_code: str) -> dict[str, Any]:
|
|
async with sem:
|
|
try:
|
|
problem_data = await fetch_json(
|
|
client,
|
|
API_PROBLEM.format(
|
|
contest_id=div4_id, problem_id=problem_code
|
|
),
|
|
)
|
|
|
|
sample_tests = (
|
|
problem_data.get("problemComponents", {}).get(
|
|
"sampleTestCases", []
|
|
)
|
|
or []
|
|
)
|
|
tests = [
|
|
TestCase(
|
|
input=t.get("input", "").strip(),
|
|
expected=t.get("output", "").strip(),
|
|
)
|
|
for t in sample_tests
|
|
if not t.get("isDeleted", False)
|
|
]
|
|
|
|
time_limit_str = problem_data.get("max_timelimit", "1")
|
|
timeout_ms = int(float(time_limit_str) * 1000)
|
|
|
|
problem_url = PROBLEM_URL.format(problem_id=problem_code)
|
|
loop = asyncio.get_event_loop()
|
|
html = await loop.run_in_executor(
|
|
None, _fetch_html_sync, problem_url
|
|
)
|
|
memory_mb = _extract_memory_limit(html)
|
|
|
|
interactive = False
|
|
|
|
except Exception:
|
|
tests = []
|
|
timeout_ms = 1000
|
|
memory_mb = 256.0
|
|
interactive = False
|
|
|
|
return {
|
|
"problem_id": problem_code,
|
|
"tests": [
|
|
{"input": t.input, "expected": t.expected} for t in tests
|
|
],
|
|
"timeout_ms": timeout_ms,
|
|
"memory_mb": memory_mb,
|
|
"interactive": interactive,
|
|
}
|
|
|
|
tasks = [run_one(problem_code) for problem_code in problems.keys()]
|
|
for coro in asyncio.as_completed(tasks):
|
|
payload = await coro
|
|
print(json.dumps(payload), flush=True)
|
|
|
|
|
|
async def main_async() -> int:
|
|
if len(sys.argv) < 2:
|
|
result = MetadataResult(
|
|
success=False,
|
|
error="Usage: codechef.py metadata <contest_id> OR codechef.py tests <contest_id> OR codechef.py contests",
|
|
url="",
|
|
)
|
|
print(result.model_dump_json())
|
|
return 1
|
|
|
|
mode: str = sys.argv[1]
|
|
scraper = CodeChefScraper()
|
|
|
|
if mode == "metadata":
|
|
if len(sys.argv) != 3:
|
|
result = MetadataResult(
|
|
success=False,
|
|
error="Usage: codechef.py metadata <contest_id>",
|
|
url="",
|
|
)
|
|
print(result.model_dump_json())
|
|
return 1
|
|
contest_id = sys.argv[2]
|
|
result = await scraper.scrape_contest_metadata(contest_id)
|
|
print(result.model_dump_json())
|
|
return 0 if result.success else 1
|
|
|
|
if mode == "tests":
|
|
if len(sys.argv) != 3:
|
|
tests_result = TestsResult(
|
|
success=False,
|
|
error="Usage: codechef.py tests <contest_id>",
|
|
problem_id="",
|
|
tests=[],
|
|
timeout_ms=0,
|
|
memory_mb=0,
|
|
)
|
|
print(tests_result.model_dump_json())
|
|
return 1
|
|
contest_id = sys.argv[2]
|
|
await scraper.stream_tests_for_category_async(contest_id)
|
|
return 0
|
|
|
|
if mode == "contests":
|
|
if len(sys.argv) != 2:
|
|
contest_result = ContestListResult(
|
|
success=False, error="Usage: codechef.py contests"
|
|
)
|
|
print(contest_result.model_dump_json())
|
|
return 1
|
|
contest_result = await scraper.scrape_contest_list()
|
|
print(contest_result.model_dump_json())
|
|
return 0 if contest_result.success else 1
|
|
|
|
result = MetadataResult(
|
|
success=False,
|
|
error=f"Unknown mode: {mode}. Use 'metadata <contest_id>', 'tests <contest_id>', or 'contests'",
|
|
url="",
|
|
)
|
|
print(result.model_dump_json())
|
|
return 1
|
|
|
|
|
|
def main() -> None:
|
|
sys.exit(asyncio.run(main_async()))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|