Merge pull request #215 from barrettruth/fix/scraper-refactor

refactor scrapers

scrapers/atcoder.py

@@ -266,43 +266,31 @@ class AtcoderScraper(BaseScraper):
         return "atcoder"
 
     async def scrape_contest_metadata(self, contest_id: str) -> MetadataResult:
-        async def impl(cid: str) -> MetadataResult:
         try:
-                rows = await asyncio.to_thread(_scrape_tasks_sync, cid)
+            rows = await asyncio.to_thread(_scrape_tasks_sync, contest_id)
-            except requests.HTTPError as e:
-                if e.response is not None and e.response.status_code == 404:
-                    return self._create_metadata_error(
-                        f"No problems found for contest {cid}", cid
-                    )
-                raise
-
             problems = _to_problem_summaries(rows)
             if not problems:
-                return self._create_metadata_error(
+                return self._metadata_error(
-                    f"No problems found for contest {cid}", cid
+                    f"No problems found for contest {contest_id}"
                 )
-
             return MetadataResult(
                 success=True,
                 error="",
-                contest_id=cid,
+                contest_id=contest_id,
                 problems=problems,
                 url=f"https://atcoder.jp/contests/{contest_id}/tasks/{contest_id}_%s",
             )
-
+        except Exception as e:
-        return await self._safe_execute("metadata", impl, contest_id)
+            return self._metadata_error(str(e))
 
     async def scrape_contest_list(self) -> ContestListResult:
-        async def impl() -> ContestListResult:
         try:
             contests = await _fetch_all_contests_async()
-            except Exception as e:
-                return self._create_contests_error(str(e))
             if not contests:
-                return self._create_contests_error("No contests found")
+                return self._contests_error("No contests found")
             return ContestListResult(success=True, error="", contests=contests)
-
+        except Exception as e:
-        return await self._safe_execute("contests", impl)
+            return self._contests_error(str(e))
 
     async def stream_tests_for_category_async(self, category_id: str) -> None:
         rows = await asyncio.to_thread(_scrape_tasks_sync, category_id)

scrapers/base.py

@@ -1,9 +1,8 @@
+import asyncio
+import sys
 from abc import ABC, abstractmethod
-from typing import Any, Awaitable, Callable, ParamSpec, cast
 
-from .models import ContestListResult, MetadataResult, TestsResult
+from .models import CombinedTest, ContestListResult, MetadataResult, TestsResult
-
-P = ParamSpec("P")
 
 
 class BaseScraper(ABC):
@@ -20,57 +19,65 @@ class BaseScraper(ABC):
     @abstractmethod
     async def stream_tests_for_category_async(self, category_id: str) -> None: ...
 
-    def _create_metadata_error(
+    def _usage(self) -> str:
-        self, error_msg: str, contest_id: str = ""
+        name = self.platform_name
-    ) -> MetadataResult:
+        return f"Usage: {name}.py metadata <id> | tests <id> | contests"
-        return MetadataResult(
-            success=False,
-            error=f"{self.platform_name}: {error_msg}",
-            contest_id=contest_id,
-            problems=[],
-            url="",
-        )
 
-    def _create_tests_error(
+    def _metadata_error(self, msg: str) -> MetadataResult:
-        self, error_msg: str, problem_id: str = "", url: str = ""
+        return MetadataResult(success=False, error=msg, url="")
-    ) -> TestsResult:
-        from .models import CombinedTest
 
+    def _tests_error(self, msg: str) -> TestsResult:
         return TestsResult(
             success=False,
-            error=f"{self.platform_name}: {error_msg}",
+            error=msg,
-            problem_id=problem_id,
+            problem_id="",
             combined=CombinedTest(input="", expected=""),
             tests=[],
             timeout_ms=0,
             memory_mb=0,
-            interactive=False,
         )
 
-    def _create_contests_error(self, error_msg: str) -> ContestListResult:
+    def _contests_error(self, msg: str) -> ContestListResult:
-        return ContestListResult(
+        return ContestListResult(success=False, error=msg)
-            success=False,
-            error=f"{self.platform_name}: {error_msg}",
-            contests=[],
-        )
 
-    async def _safe_execute(
+    async def _run_cli_async(self, args: list[str]) -> int:
-        self,
+        if len(args) < 2:
-        operation: str,
+            print(self._metadata_error(self._usage()).model_dump_json())
-        func: Callable[P, Awaitable[Any]],
+            return 1
-        *args: P.args,
+
-        **kwargs: P.kwargs,
+        mode = args[1]
-    ):
+
-        try:
+        match mode:
-            return await func(*args, **kwargs)
+            case "metadata":
-        except Exception as e:
+                if len(args) != 3:
-            if operation == "metadata":
+                    print(self._metadata_error(self._usage()).model_dump_json())
-                contest_id = cast(str, args[0]) if args else ""
+                    return 1
-                return self._create_metadata_error(str(e), contest_id)
+                result = await self.scrape_contest_metadata(args[2])
-            elif operation == "tests":
+                print(result.model_dump_json())
-                problem_id = cast(str, args[1]) if len(args) > 1 else ""
+                return 0 if result.success else 1
-                return self._create_tests_error(str(e), problem_id)
+
-            elif operation == "contests":
+            case "tests":
-                return self._create_contests_error(str(e))
+                if len(args) != 3:
-            else:
+                    print(self._tests_error(self._usage()).model_dump_json())
-                raise
+                    return 1
+                await self.stream_tests_for_category_async(args[2])
+                return 0
+
+            case "contests":
+                if len(args) != 2:
+                    print(self._contests_error(self._usage()).model_dump_json())
+                    return 1
+                result = await self.scrape_contest_list()
+                print(result.model_dump_json())
+                return 0 if result.success else 1
+
+            case _:
+                print(
+                    self._metadata_error(
+                        f"Unknown mode: {mode}. {self._usage()}"
+                    ).model_dump_json()
+                )
+                return 1
+
+    def run_cli(self) -> None:
+        sys.exit(asyncio.run(self._run_cli_async(sys.argv)))

scrapers/codechef.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python3
+
 import asyncio
 import json
 import re
-import sys
 from typing import Any
 
 import httpx
@@ -10,13 +10,11 @@ from scrapling.fetchers import Fetcher
 
 from .base import BaseScraper
 from .models import (
-    CombinedTest,
     ContestListResult,
     ContestSummary,
     MetadataResult,
     ProblemSummary,
     TestCase,
-    TestsResult,
 )
 
 BASE_URL = "https://www.codechef.com"
@@ -62,18 +60,14 @@ class CodeChefScraper(BaseScraper):
         return "codechef"
 
     async def scrape_contest_metadata(self, contest_id: str) -> MetadataResult:
-        async with httpx.AsyncClient() as client:
         try:
+            async with httpx.AsyncClient() as client:
                 data = await fetch_json(
                     client, API_CONTEST.format(contest_id=contest_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(
+                return self._metadata_error(
-                f"No problems found for contest {contest_id}", contest_id
+                    f"No problems found for contest {contest_id}"
                 )
             problems = []
             for problem_code, problem_data in data["problems"].items():
@@ -91,13 +85,15 @@ class CodeChefScraper(BaseScraper):
                 problems=problems,
                 url=f"{BASE_URL}/{contest_id}",
             )
+        except Exception as e:
+            return self._metadata_error(f"Failed to fetch contest {contest_id}: {e}")
 
     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}")
+                return self._contests_error(f"Failed to fetch contests: {e}")
             all_contests = data.get("future_contests", []) + data.get(
                 "past_contests", []
             )
@@ -110,7 +106,7 @@ class CodeChefScraper(BaseScraper):
                         num = int(match.group(1))
                         max_num = max(max_num, num)
             if max_num == 0:
-                return self._create_contests_error("No Starters contests found")
+                return self._contests_error("No Starters contests found")
             contests = []
             sem = asyncio.Semaphore(CONNECTIONS)
 
@@ -252,68 +248,5 @@ class CodeChefScraper(BaseScraper):
                 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="",
-                combined=CombinedTest(input="", expected=""),
-                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()
+    CodeChefScraper().run_cli()

scrapers/codeforces.py

@@ -4,7 +4,6 @@ import asyncio
 import json
 import logging
 import re
-import sys
 from typing import Any
 
 import requests
@@ -13,13 +12,11 @@ from scrapling.fetchers import Fetcher
 
 from .base import BaseScraper
 from .models import (
-    CombinedTest,
     ContestListResult,
     ContestSummary,
     MetadataResult,
     ProblemSummary,
     TestCase,
-    TestsResult,
 )
 
 # suppress scrapling logging - https://github.com/D4Vinci/Scrapling/issues/31)
@@ -89,14 +86,14 @@ def _extract_samples(block: Tag) -> tuple[list[TestCase], bool]:
     if not st:
         return [], False
 
-    input_pres: list[Tag] = [  # type: ignore[misc]
+    input_pres: list[Tag] = [
-        inp.find("pre")  # type: ignore[misc]
+        inp.find("pre")
-        for inp in st.find_all("div", class_="input")  # type: ignore[union-attr]
+        for inp in st.find_all("div", class_="input")
         if isinstance(inp, Tag) and inp.find("pre")
     ]
     output_pres: list[Tag] = [
-        out.find("pre")  # type: ignore[misc]
+        out.find("pre")
-        for out in st.find_all("div", class_="output")  # type: ignore[union-attr]
+        for out in st.find_all("div", class_="output")
         if isinstance(out, Tag) and out.find("pre")
     ]
     input_pres = [p for p in input_pres if isinstance(p, Tag)]
@@ -209,30 +206,31 @@ class CodeforcesScraper(BaseScraper):
         return "codeforces"
 
     async def scrape_contest_metadata(self, contest_id: str) -> MetadataResult:
-        async def impl(cid: str) -> MetadataResult:
+        try:
-            problems = await asyncio.to_thread(_scrape_contest_problems_sync, cid)
+            problems = await asyncio.to_thread(
+                _scrape_contest_problems_sync, contest_id
+            )
             if not problems:
-                return self._create_metadata_error(
+                return self._metadata_error(
-                    f"No problems found for contest {cid}", cid
+                    f"No problems found for contest {contest_id}"
                 )
             return MetadataResult(
                 success=True,
                 error="",
-                contest_id=cid,
+                contest_id=contest_id,
                 problems=problems,
                 url=f"https://codeforces.com/contest/{contest_id}/problem/%s",
             )
-
+        except Exception as e:
-        return await self._safe_execute("metadata", impl, contest_id)
+            return self._metadata_error(str(e))
 
     async def scrape_contest_list(self) -> ContestListResult:
-        async def impl() -> ContestListResult:
         try:
             r = requests.get(API_CONTEST_LIST_URL, timeout=TIMEOUT_SECONDS)
             r.raise_for_status()
             data = r.json()
             if data.get("status") != "OK":
-                    return self._create_contests_error("Invalid API response")
+                return self._contests_error("Invalid API response")
 
             contests: list[ContestSummary] = []
             for c in data["result"]:
@@ -240,18 +238,14 @@ class CodeforcesScraper(BaseScraper):
                     continue
                 cid = str(c["id"])
                 name = c["name"]
-                    contests.append(
+                contests.append(ContestSummary(id=cid, name=name, display_name=name))
-                        ContestSummary(id=cid, name=name, display_name=name)
-                    )
 
             if not contests:
-                    return self._create_contests_error("No contests found")
+                return self._contests_error("No contests found")
 
             return ContestListResult(success=True, error="", contests=contests)
         except Exception as e:
-                return self._create_contests_error(str(e))
+            return self._contests_error(str(e))
-
-        return await self._safe_execute("contests", impl)
 
     async def stream_tests_for_category_async(self, category_id: str) -> None:
         html = await asyncio.to_thread(_fetch_problems_html, category_id)
@@ -281,73 +275,5 @@ class CodeforcesScraper(BaseScraper):
             )
 
 
-async def main_async() -> int:
-    if len(sys.argv) < 2:
-        result = MetadataResult(
-            success=False,
-            error="Usage: codeforces.py metadata <contest_id> OR codeforces.py tests <contest_id> OR codeforces.py contests",
-            url="",
-        )
-        print(result.model_dump_json())
-        return 1
-
-    mode: str = sys.argv[1]
-    scraper = CodeforcesScraper()
-
-    if mode == "metadata":
-        if len(sys.argv) != 3:
-            result = MetadataResult(
-                success=False,
-                error="Usage: codeforces.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: codeforces.py tests <contest_id>",
-                problem_id="",
-                combined=CombinedTest(input="", expected=""),
-                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: codeforces.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="Unknown 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()
+    CodeforcesScraper().run_cli()

scrapers/cses.py

@@ -3,20 +3,17 @@
 import asyncio
 import json
 import re
-import sys
 from typing import Any
 
 import httpx
 
 from .base import BaseScraper
 from .models import (
-    CombinedTest,
     ContestListResult,
     ContestSummary,
     MetadataResult,
     ProblemSummary,
     TestCase,
-    TestsResult,
 )
 
 BASE_URL = "https://cses.fi"
@@ -261,73 +258,5 @@ class CSESScraper(BaseScraper):
                 print(json.dumps(payload), flush=True)
 
 
-async def main_async() -> int:
-    if len(sys.argv) < 2:
-        result = MetadataResult(
-            success=False,
-            error="Usage: cses.py metadata <category_id> OR cses.py tests <category> OR cses.py contests",
-            url="",
-        )
-        print(result.model_dump_json())
-        return 1
-
-    mode: str = sys.argv[1]
-    scraper = CSESScraper()
-
-    if mode == "metadata":
-        if len(sys.argv) != 3:
-            result = MetadataResult(
-                success=False,
-                error="Usage: cses.py metadata <category_id>",
-                url="",
-            )
-            print(result.model_dump_json())
-            return 1
-        category_id = sys.argv[2]
-        result = await scraper.scrape_contest_metadata(category_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: cses.py tests <category>",
-                problem_id="",
-                combined=CombinedTest(input="", expected=""),
-                tests=[],
-                timeout_ms=0,
-                memory_mb=0,
-            )
-            print(tests_result.model_dump_json())
-            return 1
-        category = sys.argv[2]
-        await scraper.stream_tests_for_category_async(category)
-        return 0
-
-    if mode == "contests":
-        if len(sys.argv) != 2:
-            contest_result = ContestListResult(
-                success=False, error="Usage: cses.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 <category>', 'tests <category>', or 'contests'",
-        url="",
-    )
-    print(result.model_dump_json())
-    return 1
-
-
-def main() -> None:
-    sys.exit(asyncio.run(main_async()))
-
-
 if __name__ == "__main__":
-    main()
+    CSESScraper().run_cli()

tests/conftest.py

@@ -232,33 +232,35 @@ def run_scraper_offline(fixture_text):
             case _:
                 raise AssertionError(f"Unknown scraper: {scraper_name}")
 
+    scraper_classes = {
+        "cses": "CSESScraper",
+        "atcoder": "AtcoderScraper",
+        "codeforces": "CodeforcesScraper",
+        "codechef": "CodeChefScraper",
+    }
+
     def _run(scraper_name: str, mode: str, *args: str):
         mod_path = ROOT / "scrapers" / f"{scraper_name}.py"
         ns = _load_scraper_module(mod_path, scraper_name)
         offline_fetches = _make_offline_fetches(scraper_name)
 
         if scraper_name == "codeforces":
-            fetchers.Fetcher.get = offline_fetches["Fetcher.get"]  # type: ignore[assignment]
+            fetchers.Fetcher.get = offline_fetches["Fetcher.get"]
             requests.get = offline_fetches["requests.get"]
         elif scraper_name == "atcoder":
             ns._fetch = offline_fetches["_fetch"]
             ns._get_async = offline_fetches["_get_async"]
         elif scraper_name == "cses":
-            httpx.AsyncClient.get = offline_fetches["__offline_fetch_text"]  # type: ignore[assignment]
+            httpx.AsyncClient.get = offline_fetches["__offline_fetch_text"]
         elif scraper_name == "codechef":
-            httpx.AsyncClient.get = offline_fetches["__offline_get_async"]  # type: ignore[assignment]
+            httpx.AsyncClient.get = offline_fetches["__offline_get_async"]
-            fetchers.Fetcher.get = offline_fetches["Fetcher.get"]  # type: ignore[assignment]
+            fetchers.Fetcher.get = offline_fetches["Fetcher.get"]
 
-        main_async = getattr(ns, "main_async")
+        scraper_class = getattr(ns, scraper_classes[scraper_name])
-        assert callable(main_async), f"main_async not found in {scraper_name}"
+        scraper = scraper_class()
 
         argv = [str(mod_path), mode, *args]
-        old_argv = sys.argv
+        rc, out = _capture_stdout(scraper._run_cli_async(argv))
-        sys.argv = argv
-        try:
-            rc, out = _capture_stdout(main_async())
-        finally:
-            sys.argv = old_argv
 
         json_lines: list[Any] = []
         for line in (_line for _line in out.splitlines() if _line.strip()):