119 lines
4.5 KiB
Python
119 lines
4.5 KiB
Python
"""余额获取：模板渲染 → HTTP 请求（带重试）→ JSON 路径提取。"""
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from __future__ import annotations
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import json
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import logging
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import re
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import time
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from dataclasses import dataclass
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import requests
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logger = logging.getLogger("monitor.fetcher")
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PLACEHOLDER = "{{apiKey}}"
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_TOKEN_RE = re.compile(r"([^.\[]+)|\[(\d+)\]")
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@dataclass
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class FetchResult:
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"""一次拉取的结果。"""
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ok: bool
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balance: float | None = None
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auth_error: bool = False
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status_code: int | None = None
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error: str = ""
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def render_template(text: str, api_key: str) -> str:
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"""把模板中的 {{apiKey}} 替换为账号密钥。"""
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return text.replace(PLACEHOLDER, api_key)
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def extract_balance(data: object, path: str) -> float:
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"""按点路径/数组索引提取余额，如 data.balance、data[0].balance、$.data[0].balance。
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取到的值必须是数字或可转数字的字符串，否则抛 ValueError。
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"""
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p = path.strip()
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if p.startswith("$"):
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p = p[1:]
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cur: object = data
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for key, idx in _TOKEN_RE.findall(p):
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if key:
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if not isinstance(cur, dict) or key not in cur:
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raise ValueError(f"路径不存在: {path}（在 {key!r} 处）")
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cur = cur[key]
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if idx != "":
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n = int(idx)
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if not isinstance(cur, list) or n >= len(cur):
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raise ValueError(f"数组索引越界: {path}（索引 {n}）")
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cur = cur[n]
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if isinstance(cur, bool) or not isinstance(cur, (int, float, str)):
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raise ValueError(f"余额不是数字: {path} -> {cur!r}")
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try:
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return float(cur)
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except (TypeError, ValueError):
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raise ValueError(f"余额不是数字: {path} -> {cur!r}")
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def _build_request(platform: dict, api_key: str) -> tuple[str, dict, str | None]:
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url = render_template(platform["url"], api_key)
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headers_raw = platform.get("headers") or {}
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if isinstance(headers_raw, str):
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headers_raw = json.loads(headers_raw) if headers_raw.strip() else {}
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headers = json.loads(render_template(json.dumps(headers_raw), api_key))
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body = None
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if platform["method"] == "POST" and platform.get("body"):
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body = render_template(platform["body"], api_key)
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return url, headers, body
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def fetch_balance(platform: dict, api_key: str, retry_count: int, timeout: int) -> FetchResult:
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"""执行一次余额拉取。
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策略：
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- 401/403 → auth_error（不重试，由调用方禁用账号并通知）
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- 其他 4xx → 直接失败（配置问题，不重试）
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- 网络异常 / 5xx → 重试 retry_count 次，间隔 2s
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- JSON 解析/路径提取失败 → 直接失败
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"""
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url, headers, body = _build_request(platform, api_key)
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method = platform["method"]
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attempts = retry_count + 1
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for attempt in range(attempts):
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try:
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if method == "GET":
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resp = requests.get(url, headers=headers, timeout=timeout)
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else:
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resp = requests.post(url, headers=headers, data=body, timeout=timeout)
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except requests.RequestException as exc:
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logger.warning("请求异常(%s/%s) %s: %s", attempt + 1, attempts, url, exc)
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if attempt < attempts - 1:
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time.sleep(2)
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continue
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if resp.status_code in (401, 403):
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return FetchResult(ok=False, auth_error=True, status_code=resp.status_code,
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error=f"HTTP {resp.status_code}（认证失败）")
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if resp.status_code >= 500:
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logger.warning("服务端错误(%s/%s) %s status=%s", attempt + 1, attempts, url, resp.status_code)
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if attempt < attempts - 1:
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time.sleep(2)
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continue
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if resp.status_code >= 400:
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return FetchResult(ok=False, status_code=resp.status_code,
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error=f"HTTP {resp.status_code}: {resp.text[:120]}")
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try:
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data = resp.json()
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except ValueError:
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return FetchResult(ok=False, status_code=resp.status_code,
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error="响应不是合法 JSON")
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try:
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balance = extract_balance(data, platform["balance_path"])
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except ValueError as exc:
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return FetchResult(ok=False, status_code=resp.status_code, error=str(exc))
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return FetchResult(ok=True, balance=balance, status_code=resp.status_code)
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return FetchResult(ok=False, error=f"网络错误，重试 {retry_count} 次后仍失败")
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