数据抓取代理

构建一个生产就绪、AI驱动的数据收集代理，适用于任何公共数据源。 按计划运行，使用免费LLM丰富结果，存储到数据库，并随时间推移不断改进。

技术栈：Python · Gemini Flash (免费) · GitHub Actions (免费) · Notion / Sheets / Supabase

何时激活

• 用户想要抓取或监控任何公共网站或API
• 用户说"构建一个检查...的机器人"、"为我监控X"、"从...收集数据"
• 用户想要跟踪工作、价格、新闻、仓库、体育比分、事件、列表
• 用户询问如何自动化数据收集而无需支付托管费用
• 用户想要一个能根据他们的决策随时间推移变得更智能的代理

核心概念

三层架构

每个数据抓取代理都有三层：

COLLECT → ENRICH → STORE
  │           │        │
Scraper    AI (LLM)  Database
runs on    scores/   Notion /
schedule   summarises Sheets /
           & classifies Supabase

免费技术栈

AI模型后备链

构建代理以在配额耗尽时自动在Gemini模型间回退：

gemini-2.0-flash-lite (30 RPM) →
gemini-2.0-flash (15 RPM) →
gemini-2.5-flash (10 RPM) →
gemini-flash-lite-latest (fallback)

批量API调用以提高效率

切勿为每个项目单独调用LLM。始终批量处理：

# BAD: 33 API calls for 33 items
for item in items:
    result = call_ai(item)  # 33 calls → hits rate limit

# GOOD: 7 API calls for 33 items (batch size 5)
for batch in chunks(items, size=5):
    results = call_ai(batch)  # 7 calls → stays within free tier

---

工作流程

步骤 1: 理解目标

询问用户：

1. 收集什么： "数据源是什么？URL / API / RSS / 公共端点？"
2. 提取什么： "哪些字段重要？标题、价格、URL、日期、分数？"
3. 如何存储： "结果应该存储在哪里？Notion、Google Sheets、Supabase，还是本地文件？"
4. 如何丰富： "您希望AI对每个项目进行评分、总结、分类或匹配吗？"
5. 频率： "应该多久运行一次？每小时、每天、每周？"

常见的提示示例：

• 招聘网站 → 根据简历评分相关性
• 产品价格 → 降价时发出警报
• GitHub仓库 → 总结新版本
• 新闻源 → 按主题+情感分类
• 体育结果 → 提取统计数据到跟踪器
• 活动日历 → 按兴趣筛选

---

步骤 2: 设计代理架构

为用户生成以下目录结构：

my-agent/
├── config.yaml              # 用户自定义此文件（关键词、过滤器、偏好设置）
├── profile/
│   └── context.md           # AI 使用的用户上下文（简历、兴趣、标准）
├── scraper/
│   ├── __init__.py
│   ├── main.py              # 协调器：抓取 → 丰富 → 存储
│   ├── filters.py           # 基于规则的预过滤器（快速，在 AI 处理之前）
│   └── sources/
│       ├── __init__.py
│       └── source_name.py   # 每个数据源一个文件
├── ai/
│   ├── __init__.py
│   ├── client.py            # Gemini REST 客户端，带模型回退
│   ├── pipeline.py          # 批量 AI 分析
│   ├── jd_fetcher.py        # 从 URL 获取完整内容（可选）
│   └── memory.py            # 从用户反馈中学习
├── storage/
│   ├── __init__.py
│   └── notion_sync.py       # 或 sheets_sync.py / supabase_sync.py
├── data/
│   └── feedback.json        # 用户决策历史（自动更新）
├── .env.example
├── setup.py                 # 一次性数据库/模式创建
├── enrich_existing.py       # 对旧行进行 AI 分数回填
├── requirements.txt
└── .github/
    └── workflows/
        └── scraper.yml      # GitHub Actions 计划任务

---

步骤 3: 构建抓取器源

适用于任何数据源的模板：

# scraper/sources/my_source.py
"""
[Source Name] — scrapes [what] from [where].
Method: [REST API / HTML scraping / RSS feed]
"""

from bs4 import BeautifulSoup
from datetime import datetime, timezone
from scraper.filters import is_relevant

HEADERS = {
    "User-Agent": "Mozilla/5.0 (compatible; research-bot/1.0)",
}

def fetch() -> list[dict]:
    """
    Returns a list of items with consistent schema.
    Each item must have at minimum: name, url, date_found.
    """
    results = []

    # ---- REST API source ----
    resp = requests.get("https://api.example.com/items", headers=HEADERS, timeout=15)
    if resp.status_code == 200:
        for item in resp.json().get("results", []):
            if not is_relevant(item.get("title", "")):
                continue
            results.append(_normalise(item))

    return results

def _normalise(raw: dict) -> dict:
    """Convert raw API/HTML data to the standard schema."""
    return {
        "name": raw.get("title", ""),
        "url": raw.get("link", ""),
        "source": "MySource",
        "date_found": datetime.now(timezone.utc).date().isoformat(),
        # add domain-specific fields here
    }

HTML抓取模式：

soup = BeautifulSoup(resp.text, "lxml")
for card in soup.select("[class*='listing']"):
    title = card.select_one("h2, h3").get_text(strip=True)
    link = card.select_one("a")["href"]
    if not link.startswith("http"):
        link = f"https://example.com{link}"

RSS源模式：

root = ET.fromstring(resp.text)
for item in root.findall(".//item"):
    title = item.findtext("title", "")
    link = item.findtext("link", "")

---

步骤 4: 构建Gemini AI客户端

# ai/client.py

_last_call = 0.0

MODEL_FALLBACK = [
    "gemini-2.0-flash-lite",
    "gemini-2.0-flash",
    "gemini-2.5-flash",
    "gemini-flash-lite-latest",
]

def generate(prompt: str, model: str = "", rate_limit: float = 7.0) -> dict:
    """Call Gemini with auto-fallback on 429. Returns parsed JSON or {}."""
    global _last_call

    api_key = os.environ.get("GEMINI_API_KEY", "")
    if not api_key:
        return {}

    elapsed = time.time() - _last_call
    if elapsed < rate_limit:
        time.sleep(rate_limit - elapsed)

    models = [model] + [m for m in MODEL_FALLBACK if m != model] if model else MODEL_FALLBACK
    _last_call = time.time()

    for m in models:
        url = f"https://generativelanguage.googleapis.com/v1beta/models/{m}:generateContent?key={api_key}"
        payload = {
            "contents": [{"parts": [{"text": prompt}]}],
            "generationConfig": {
                "responseMimeType": "application/json",
                "temperature": 0.3,
                "maxOutputTokens": 2048,
            },
        }
        try:
            resp = requests.post(url, json=payload, timeout=30)
            if resp.status_code == 200:
                return _parse(resp)
            if resp.status_code in (429, 404):
                time.sleep(1)
                continue
            return {}
        except requests.RequestException:
            return {}

    return {}

def _parse(resp) -> dict:
    try:
        text = (
            resp.json()
            .get("candidates", [{}])[0]
            .get("content", {})
            .get("parts", [{}])[0]
            .get("text", "")
            .strip()
        )
        if text.startswith("```"):
            text = text.split("\
", 1)[-1].rsplit("```", 1)[0]
        return json.loads(text)
    except (json.JSONDecodeError, KeyError):
        return {}

---

步骤 5: 构建AI管道（批量）

# ai/pipeline.py

from pathlib import Path
from ai.client import generate

def analyse_batch(items: list[dict], context: str = "", preference_prompt: str = "") -> list[dict]:
    """Analyse items in batches. Returns items enriched with AI fields."""
    config = yaml.safe_load((Path(__file__).parent.parent / "config.yaml").read_text())
    model = config.get("ai", {}).get("model", "gemini-2.5-flash")
    rate_limit = config.get("ai", {}).get("rate_limit_seconds", 7.0)
    min_score = config.get("ai", {}).get("min_score", 0)
    batch_size = config.get("ai", {}).get("batch_size", 5)

    batches = [items[i:i + batch_size] for i in range(0, len(items), batch_size)]
    print(f"  [AI] {len(items)} items → {len(batches)} API calls")

    enriched = []
    for i, batch in enumerate(batches):
        print(f"  [AI] Batch {i + 1}/{len(batches)}...")
        prompt = _build_prompt(batch, context, preference_prompt, config)
        result = generate(prompt, model=model, rate_limit=rate_limit)

        analyses = result.get("analyses", [])
        for j, item in enumerate(batch):
            ai = analyses[j] if j < len(analyses) else {}
            if ai:
                score = max(0, min(100, int(ai.get("score", 0))))
                if min_score and score < min_score:
                    continue
                enriched.append({**item, "ai_score": score, "ai_summary": ai.get("summary", ""), "ai_notes": ai.get("notes", "")})
            else:
                enriched.append(item)

    return enriched

def _build_prompt(batch, context, preference_prompt, config):
    priorities = config.get("priorities", [])
    items_text = "\
\
".join(
        f"Item {i+1}: {json.dumps({k: v for k, v in item.items() if not k.startswith('_')})}"
        for i, item in enumerate(batch)
    )

    return f"""Analyse these {len(batch)} items and return a JSON object.

# Items
{items_text}

# User Context
{context[:800] if context else "Not provided"}

# User Priorities
{chr(10).join(f"- {p}" for p in priorities)}

{preference_prompt}

# Instructions
Return: {{"analyses": [{{"score": <0-100>, "summary": "<2 sentences>", "notes": "<why this matches or doesn't>"}} for each item in order]}}
Be concise. Score 90+=excellent match, 70-89=good, 50-69=ok, <50=weak."""

---

步骤 6: 构建反馈学习系统

# ai/memory.py
"""Learn from user decisions to improve future scoring."""

from pathlib import Path

FEEDBACK_PATH = Path(__file__).parent.parent / "data" / "feedback.json"

def load_feedback() -> dict:
    if FEEDBACK_PATH.exists():
        try:
            return json.loads(FEEDBACK_PATH.read_text())
        except (json.JSONDecodeError, OSError):
            pass
    return {"positive": [], "negative": []}

def save_feedback(fb: dict):
    FEEDBACK_PATH.parent.mkdir(parents=True, exist_ok=True)
    FEEDBACK_PATH.write_text(json.dumps(fb, indent=2))

def build_preference_prompt(feedback: dict, max_examples: int = 15) -> str:
    """Convert feedback history into a prompt bias section."""
    lines = []
    if feedback.get("positive"):
        lines.append("# Items the user LIKED (positive signal):")
        for e in feedback["positive"][-max_examples:]:
            lines.append(f"- {e}")
    if feedback.get("negative"):
        lines.append("\
# Items the user SKIPPED/REJECTED (negative signal):")
        for e in feedback["negative"][-max_examples:]:
            lines.append(f"- {e}")
    if lines:
        lines.append("\
Use these patterns to bias scoring on new items.")
    return "\
".join(lines)

与存储层集成： 每次运行后，从数据库中查询具有正面/负面状态的项，并使用提取的模式调用 save_feedback()。

---

步骤 7: 构建存储（Notion示例）

# storage/notion_sync.py

from notion_client import Client
from notion_client.errors import APIResponseError

_client = None

def get_client():
    global _client
    if _client is None:
        _client = Client(auth=os.environ["NOTION_TOKEN"])
    return _client

def get_existing_urls(db_id: str) -> set[str]:
    """Fetch all URLs already stored — used for deduplication."""
    client, seen, cursor = get_client(), set(), None
    while True:
        resp = client.databases.query(database_id=db_id, page_size=100, **{"start_cursor": cursor} if cursor else {})
        for page in resp["results"]:
            url = page["properties"].get("URL", {}).get("url", "")
            if url: seen.add(url)
        if not resp["has_more"]: break
        cursor = resp["next_cursor"]
    return seen

def push_item(db_id: str, item: dict) -> bool:
    """Push one item to Notion. Returns True on success."""
    props = {
        "Name": {"title": [{"text": {"content": item.get("name", "")[:100]}}]},
        "URL": {"url": item.get("url")},
        "Source": {"select": {"name": item.get("source", "Unknown")}},
        "Date Found": {"date": {"start": item.get("date_found")}},
        "Status": {"select": {"name": "New"}},
    }
    # AI fields
    if item.get("ai_score") is not None:
        props["AI Score"] = {"number": item["ai_score"]}
    if item.get("ai_summary"):
        props["Summary"] = {"rich_text": [{"text": {"content": item["ai_summary"][:2000]}}]}
    if item.get("ai_notes"):
        props["Notes"] = {"rich_text": [{"text": {"content": item["ai_notes"][:2000]}}]}

    try:
        get_client().pages.create(parent={"database_id": db_id}, properties=props)
        return True
    except APIResponseError as e:
        print(f"[notion] Push failed: {e}")
        return False

def sync(db_id: str, items: list[dict]) -> tuple[int, int]:
    existing = get_existing_urls(db_id)
    added = skipped = 0
    for item in items:
        if item.get("url") in existing:
            skipped += 1; continue
        if push_item(db_id, item):
            added += 1; existing.add(item["url"])
        else:
            skipped += 1
    return added, skipped

---

步骤 8: 在 main.py 中编排

# scraper/main.py

from pathlib import Path
from dotenv import load_dotenv

load_dotenv()

from scraper.sources import my_source          # add your sources

# NOTE: This example uses Notion. If storage.provider is "sheets" or "supabase",
# replace this import with storage.sheets_sync or storage.supabase_sync and update
# the env var and sync() call accordingly.
from storage.notion_sync import sync

SOURCES = [
    ("My Source", my_source.fetch),
]

def ai_enabled():
    return bool(os.environ.get("GEMINI_API_KEY"))

def main():
    config = yaml.safe_load((Path(__file__).parent.parent / "config.yaml").read_text())
    provider = config.get("storage", {}).get("provider", "notion")

    # Resolve the storage target identifier from env based on provider
    if provider == "notion":
        db_id = os.environ.get("NOTION_DATABASE_ID")
        if not db_id:
            print("ERROR: NOTION_DATABASE_ID not set"); sys.exit(1)
    else:
        # Extend here for sheets (SHEET_ID) or supabase (SUPABASE_TABLE) etc.
        print(f"ERROR: provider '{provider}' not yet wired in main.py"); sys.exit(1)

    config = yaml.safe_load((Path(__file__).parent.parent / "config.yaml").read_text())
    all_items = []

    for name, fetch_fn in SOURCES:
        try:
            items = fetch_fn()
            print(f"[{name}] {len(items)} items")
            all_items.extend(items)
        except Exception as e:
            print(f"[{name}] FAILED: {e}")

    # Deduplicate by URL
    seen, deduped = set(), []
    for item in all_items:
        if (url := item.get("url", "")) and url not in seen:
            seen.add(url); deduped.append(item)

    print(f"Unique items: {len(deduped)}")

    if ai_enabled() and deduped:
        from ai.memory import load_feedback, build_preference_prompt
        from ai.pipeline import analyse_batch

        # load_feedback() reads data/feedback.json written by your feedback sync script.
        # To keep it current, implement a separate feedback_sync.py that queries your
        # storage provider for items with positive/negative statuses and calls save_feedback().
        feedback = load_feedback()
        preference = build_preference_prompt(feedback)
        context_path = Path(__file__).parent.parent / "profile" / "context.md"
        context = context_path.read_text() if context_path.exists() else ""
        deduped = analy