04d6303da2
- Define generic Result[T] dataclass (7 fields: success, status_code, data, list, count, is_end_page, error) - Port parse_response() from spiderJobs/core/base.py returning Result[Any] - BaseFetcher: 4 template methods (_build_params, _parse required; _build_headers, _check_blocked optional) - BaseSearcher: 4 template methods with load_all() paginator using stdlib logging - crawler_core/__init__.py exports BaseFetcher, BaseSearcher, Result, HTTPClient, parse_response - No ApiResult, no loguru, no spiderJobs/app imports
208 lines
7.7 KiB
Python
208 lines
7.7 KiB
Python
"""
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crawler_core.base — 通用基类与数据结构
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提供所有招聘平台共用的: Result, BaseFetcher, BaseSearcher, parse_response
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不依赖任何平台特定代码。
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"""
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from __future__ import annotations
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import logging
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from dataclasses import dataclass, field
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from typing import Any, Generic, Optional, TypeVar
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from crawler_core.http_client import HTTPClient
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T = TypeVar("T")
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_logger = logging.getLogger("crawler_core.base")
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# ─────────────────────────────────────────────
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# 通用数据结构
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# ─────────────────────────────────────────────
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@dataclass
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class Result(Generic[T]):
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"""Typed result wrapper returned by all BaseFetcher and BaseSearcher methods.
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Callers annotate as Result[MyJobModel] etc.
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"""
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success: bool
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status_code: int
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data: Optional[T] = None
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list: list[T] = field(default_factory=list)
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count: int = 0
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is_end_page: bool = True
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error: Optional[str] = None
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# ─────────────────────────────────────────────
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# 通用响应解析（可覆写）
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# ─────────────────────────────────────────────
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def parse_response(http_code: int, raw: Any) -> Result[Any]:
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"""
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默认响应解析算法
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各平台如果格式不同，可在子类中覆写 parse_response 方法
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"""
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biz_code = raw.get("statusCode") if isinstance(raw, dict) else http_code
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if http_code != 200 or biz_code != 200:
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return Result(
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success=False,
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status_code=biz_code or http_code,
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error=(
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raw.get("statusDescription")
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or raw.get("message")
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or f"请求失败: {biz_code}"
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) if isinstance(raw, dict) else f"请求失败: {http_code}",
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)
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payload = (raw.get("data") or {}) if isinstance(raw, dict) else {}
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if isinstance(payload, dict) and "list" in payload:
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return Result(
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success=True, status_code=200, data=payload,
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list=payload.get("list", []),
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count=payload.get("count", 0),
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is_end_page=payload.get("isEndPage", True),
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)
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return Result(success=True, status_code=200, data=payload)
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# ─────────────────────────────────────────────
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# 基础 Fetcher（GET 详情类）
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# ─────────────────────────────────────────────
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class BaseFetcher:
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"""Template-method base class for single-item fetchers.
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Required overrides: _build_params(), _parse()
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Optional overrides: _build_headers(), _check_blocked()
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"""
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ENDPOINT: str = ""
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def __init__(self, http_client: HTTPClient) -> None:
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self.http_client = http_client
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# --- Required template methods ---
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def _build_params(self) -> dict:
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"""Build query/body parameters for the request. MUST be overridden."""
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raise NotImplementedError(f"{type(self).__name__} must implement _build_params()")
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def _parse(self, http_code: int, raw: Any) -> Result:
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"""Parse the HTTP response into a Result. MUST be overridden."""
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raise NotImplementedError(f"{type(self).__name__} must implement _parse()")
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# --- Optional template methods ---
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def _build_headers(self) -> dict:
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"""Build extra request headers. Override to add platform-specific headers.
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Default: returns {} (no extra headers beyond HTTPClient defaults).
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"""
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return {}
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def _check_blocked(self, status_code: int, body: str) -> bool:
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"""Detect platform-specific anti-crawl blocks.
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Override to inspect response body/status for block signals.
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Default: returns False (assume not blocked).
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"""
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return False
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# --- Orchestration ---
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def fetch(self) -> Result:
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"""Execute the fetch: build params → request → check blocked → parse."""
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params = self._build_params()
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extra_headers = self._build_headers()
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http_code, raw = self.http_client.get(
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self.ENDPOINT, params=params, headers=extra_headers or None
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)
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raw_str = str(raw) if not isinstance(raw, str) else raw
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if self._check_blocked(http_code, raw_str):
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return Result(success=False, status_code=http_code, error="blocked")
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return self._parse(http_code, raw)
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# ─────────────────────────────────────────────
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# 基础 Searcher（搜索 + 分页类）
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# ─────────────────────────────────────────────
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class BaseSearcher:
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"""Template-method base class for paginated list searchers.
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Required overrides: _build_params(), _parse()
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Optional overrides: _build_headers(), _check_blocked()
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"""
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ENDPOINT: str = ""
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def __init__(self, page_size: int = 15, http_client: Optional[HTTPClient] = None) -> None:
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self.page_size = page_size
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self.http_client = http_client
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# --- Required template methods ---
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def _build_params(self, page_index: int) -> dict:
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"""Build pagination query params. MUST be overridden."""
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raise NotImplementedError(f"{type(self).__name__} must implement _build_params()")
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def _parse(self, http_code: int, raw: Any) -> Result:
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"""Parse the HTTP response into a Result. MUST be overridden."""
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raise NotImplementedError(f"{type(self).__name__} must implement _parse()")
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# --- Optional template methods ---
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def _build_headers(self) -> dict:
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"""Build extra request headers. Override for platform-specific headers.
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Default: returns {} (no extra headers beyond HTTPClient defaults).
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"""
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return {}
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def _check_blocked(self, status_code: int, body: str) -> bool:
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"""Detect platform-specific anti-crawl blocks.
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Override to inspect response body/status for block signals.
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Default: returns False (assume not blocked).
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"""
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return False
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# --- Orchestration ---
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def _request(self, params: dict) -> tuple[int, Any]:
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"""Execute a single HTTP request. Uses _build_headers() for extra headers."""
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extra_headers = self._build_headers()
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return self.http_client.get(
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self.ENDPOINT, params=params, headers=extra_headers or None
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)
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def search(self, page_index: int = 1) -> Result:
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"""Fetch a single page: build params → request → check blocked → parse."""
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params = self._build_params(page_index)
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http_code, raw = self._request(params)
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raw_str = str(raw) if not isinstance(raw, str) else raw
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if self._check_blocked(http_code, raw_str):
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return Result(success=False, status_code=http_code, error="blocked")
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return self._parse(http_code, raw)
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def load_all(self, max_pages: int = 10, on_page=None) -> list:
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"""Iterate pages until is_end_page=True or max_pages reached."""
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all_items: list = []
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for page_index in range(1, max_pages + 1):
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result = self.search(page_index)
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if not result.success:
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_logger.warning("第 %d 页失败: %s", page_index, result.error)
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break
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all_items.extend(result.list)
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if on_page:
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on_page(page_index, result)
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if result.is_end_page:
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break
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return all_items
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