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轻量级Python爬虫框架实战教程

  • 2026-02-17 04:09:28
轻量级Python爬虫框架实战教程
#从零开始构建轻量级Python爬虫框架:异步并发实战指南
>适合人群:Python爬虫入门开发者
>技术栈:asyncio、aiohttp、Redis、MySQL
>难度:⭐⭐⭐

##📖 前言

在数据采集的世界里,效率就是生命。传统的同步爬虫在面对大规模数据采集时往往力不从心,而本文将带你深入了解一个**生产级轻量级异步爬虫框架**的完整设计与实现。

###框架核心特性

  • ✅ 双模式执行:批量执行(历史采集)+ 定时执行(增量采集)
  • ✅ 高并发+分布式:异步协程 + Redis队列,支持多机部署
  • ✅ 断点续采:任务持久化,支持中断恢复
  • ✅ 资源监控:实时监控CPU、内存、线程数
  • ✅ 灵活入库:支持单表/多表、批量/逐条、自动去重
  • ✅ 模块解耦:装饰器链设计,职责分离
  • ✅ 完善日志:结构化日志 + 失败记录持久化

##🎯 框架架构总览

###四层架构设计

本框架采用分层解耦的设计理念,从上到下分为四层:

**1. 执行入口层**
  • main.py:定时调度器,用于增量采集
  • runner_batch.py:批量执行器,用于历史采集
**2. 任务消费者层**
  • Redis队列监听(BRPOP阻塞弹出)
  • Semaphore并发控制
  • 自动重试+指数退避
  • 队列超时监控
**3. 爬虫业务层**
  • 装饰器链:@async_request → @parse_response → @save_into_mysql
  • 自动翻页机制
  • 响应有效性检查
**4. 工具支撑层**
  • RedisManager:连接池管理
  • MySQLManager:连接池+自动重连
  • HTTP装饰器:请求重试+代理支持
  • Monitor:资源监控
  • Logger:日志管理

##🚀 核心特性一:双模式执行

###模式1:runner_batch.py(批量执行-历史采集)

**适用场景**:一次性采集大量历史数据
**核心代码**(runner_batch.py:185-218):
async def main():    # 1. 初始化Redis连接池    await RedisManager.initialize()    RedisManager.start_daemon()    # 2. 初始化MySQL连接池    mysql_manager = MySQLManager(MYSQL_CONF)    await mysql_manager.init_pool()    # 3. 启动资源监控(后台任务)    monitor_task = asyncio.create_task(        monitor.monitor_process_resources(interval=5)    )    # 4. 创建消费者协程    consumers = []    for t in TASKS:        workers = t.get("workers"1)        for i in range(workers):            consumers.append(consume_task(...))    # 5. 并发执行所有消费者    await asyncio.gather(*consumers)
**任务配置**(runner_batch.py:176-182):
TASKS = [    {        "key""amacfund:fund_detail",        "func": amac_fund_crawler.get_fund_detail,        "log""基金详情",        "field""fund_id",        "workers"20,  # 20个并发协程        "limit"20,    # 信号量限制        "need_paging"False    }]

###模式2:main.py(定时调度-增量采集)

**适用场景**:每天定时采集新增数据
**核心代码**(main.py:44-82):
async def main():    scheduler = AsyncIOScheduler()    # 添加定时任务(每天7:00执行)    scheduler.add_job(        run_task,        CronTrigger(hour=7, minute=0),        id='amacfund_crawler',        name='基金数据采集'    )    scheduler.start()    await asyncio.Event().wait()
**Cron表达式示例**:
# 每天7:00CronTrigger(hour=7, minute=0)# 每小时CronTrigger(minute=0)# 每5分钟CronTrigger(minute='*/5')# 工作日9:00CronTrigger(day_of_week='mon-fri', hour=9, minute=0)

###两种模式对比

|特性|runner_batch.py|main.py|

|---------|----------------|---------|

|执行方式|立即执行,队列消费完退出|定时执行,持续运行|
|适用场景|历史数据全量采集|增量数据定期更新|
|启动命令|`python runner_batch.py`|`python main.py`|
|任务来源|Redis队列|定时触发|
|典型用例|采集过去10年基金数据|每天采集昨日新增|

---

##🔥 核心特性二:高并发+分布式+断点续采

###1. 异步高并发

**核心机制**:asyncio协程 + Semaphore信号量
**代码实现**(runner_batch.py:103-106):
async with sem:  # 信号量控制并发    result = await asyncio.wait_for(        crawler_func(**params),        timeout=timeout    )
**并发控制**(runner_batch.py:44-45):
if task_key not in task_locks:    task_locks[task_key] = asyncio.Semaphore(limit)
**效果**:
-配置`workers=20, limit=20`:20个协程并发执行
-配置`workers=50, limit=20`:50个协程轮流使用20个并发槽位

###2. 分布式部署

**架构设计**:
机器1 (runner_batch.py)  ──┐                           ├──→ Redis队列 ←──→ MySQL机器2 (runner_batch.py)  ──┤                           │机器3 (runner_batch.py)  ──┘
**实现方式**:
-所有机器共享同一个Redis队列
-使用BRPOP原子操作,避免重复消费
-任务自动分配,无需手动协调
**部署步骤**:
# 机器1python runner_batch.py# 机器2python runner_batch.py# 机器3python runner_batch.py```

###3. 断点续采

**核心机制**:任务持久化到Redis队列
**优雅退出**(runner_batch.py:153-170):
async def shutdown():    stop_flag = True    # 未完成任务放回队列    for task_key, record in running_tasks:        await RedisManager.lpush(retry_key, record)    # 关闭数据库连接    mysql_manager.mysql.close()    await mysql_manager.mysql.wait_closed()
**重试机制**(runner_batch.py:100-122):
# 重试3次,指数退避for attempt inrange(max_retries):    try:        result = await crawler_func(**params)        break    except Exception as e:        if attempt < max_retries:            await asyncio.sleep(retry_delay * attempt)# 失败后放入重试队列if attempt >= max_retries:    await RedisManager.lpush(retry_key, json.dumps(params))
**队列超时监控**(runner_batch.py:57-70):
# 2小时无新任务,自动停止if time_since_last_activity > QUEUE_TIMEOUT:    task_stop_flags[task_key] = True    break

##📊 核心特性三:资源监控

**实时监控**(monitor.py:30-82):
async def monitor_process_resources(interval=5):    process = psutil.Process(os.getpid())    while True:        # 内存使用        memory_mb = process.memory_info().rss / 1024 / 1024        # CPU使用率        cpu_usage = (current_cpu_time - last_cpu_time) /                    (current_time - last_time) * 100        # 线程数        num_threads = process.num_threads()        logging.info(f"{timestamp} | 内存:{memory_mb:.2f}MB | CPU:{cpu_usage:.1f}% | 线程:{num_threads}")        await asyncio.sleep(interval)
**监控输出示例**:

14:23:15 | 内存:156.32MB | CPU:28.5% | 线程:25

14:23:20 | 内存:158.47MB | CPU:31.2% | 线程:25

14:23:25 | 内存:159.81MB | CPU:29.8% | 线程:25

##💾 核心特性四:灵活入库机制

###1. 装饰器设计

**完整装饰器链**(crawler/amac_fund.py:63-79):
@save_into_mysql(table_name="fund_info", unique_key="pmid")@parse_response(parse_fund_detail, extra_args=["self""**kwargs"])@async_request(method="GET", delay=0.1, if_proxy=True)async def get_fund_detail(self, fund_id, **kwargs):    url = AMAC_FUND_DETAIL_API.format(fund_id=fund_id)    return {        "url": url,        "headers": {},        "crawler"self    }
**执行流程**:
1. get_fund_detail() 返回请求参数   ↓2. @async_request 发送HTTP请求   ↓3. @parse_response 解析响应数据   ↓4. @save_into_mysql 保存到数据库

###2. 自动去重机制

**实现方式**(mysql_manager.py:186-216):
async def _process_single_row(conn, cursor, row):    # 1. 检查记录是否存在    check_sql = f"SELECT 1 FROM {table} WHERE {unique_key} = %s"    exists = await cursor.fetchone()    if exists:        # 2. 存在则UPDATE        update_sql = f"UPDATE {table} SET ... WHERE {unique_key}=%s"        await cursor.execute(update_sql, values)    else:        # 3. 不存在则INSERT        insert_sql = f"INSERT INTO {table} (...) VALUES (...)"        await cursor.execute(insert_sql, values)

###3. 降级策略

**批量插入失败时降级为逐条插入**(mysql_manager.py:265-279):
# 先尝试批量插入success = await _execute_batch_all()if not success and enable_fallback:    # 降级:逐条插入    for row in rows:        if not await _execute_single(row):            failed_records.append(row)

###4. 失败记录持久化

**保存失败记录到本地**(mysql_manager.py:301-328):
async def _save_failed_records(table, failed_records):    filename = f"logs/failed_records/{table}_{timestamp}.json"    with open(filename, 'w', encoding='utf-8'as f:        json.dump({            "table": table,            "count"len(failed_records),            "records": failed_records        }, f, ensure_ascii=False, indent=2)

##🧩 核心特性五:模块解耦

###1. 装饰器职责分离

**@async_request**(utils/http.py:26-108):
-职责:HTTP请求
-功能:重试、超时、代理、延迟
**@parse_response**(utils/parsers.py:92-165):
-职责:数据解析
-功能:响应验证、解析函数调用、任务推送
**@save_into_mysql**(utils/mysql_manager.py:84-158):
-职责:数据存储
-功能:去重、批量插入、降级策略

###2. 解析器独立

**列表页解析**(utils/parsers.py:168-210):
async def parse_fund_list(data, crawler, **kwargs):    records = data.get('content', [])    result = []    for record in records:        fund_info = {            'fund_id'record.get("id"),            'fund_name'record.get("fundName"),            ...        }        result.append(fund_info)        # 推送详情任务到队列        await crawler.redis.lpush(            "amacfund:fund_detail",            json.dumps(fund_info)        )    return result
**详情页解析**(utils/parsers.py:213-253):
async def parse_fund_detail(response, crawler, **kwargs):    soup = BeautifulSoup(response, 'html.parser')    fund_info = {}    rows = soup.select('div.info-body table.table tr')    for row in rows:        cells = row.find_all('td')        title = cells[0].get_text(strip=True)        value = cells[1].get_text(strip=True)        if title == '基金类型':            fund_info['fund_type'] = value        ...    return fund_info

##📝 核心特性六:完善日志

###1. 结构化日志

**日志格式**:
logging.info(f"✅ 采集成功 | 基金ID: {fund_id} | 耗时: {elapsed}s")logging.error(f"❌ 采集失败 | 基金ID: {fund_id} | 错误: {error}")logging.warning(f"⏰ 队列超时 | 队列: {task_key} | 超时: {timeout}s")

###2. 日志分级

**配置**(utils/logger_config.py):
# INFO级别:正常日志logging.basicConfig(level=logging.INFO)# ERROR级别:错误日志(单独文件)setup_error_logger()

###3. 失败记录

**JSON格式保存**:
{  "table": "fund_info",  "timestamp""20260212_143025",  "count"5,  "records": [    {"fund_id": "123""fund_name""xxx"}  ]}

##🎯 实战案例:基金数据采集

###完整流程

**1. 推送初始任务**:
redis-cli LPUSH amacfund:amac_fund_list '{"page"0"page_size"20}'
**2. 启动批量采集**:
python runner_batch.py
**3. 执行流程**:
消费列表任务  ↓解析列表页(20条基金)  ↓推送20个详情任务到队列  ↓20个协程并发消费详情任务  ↓解析详情页  ↓保存到MySQL  ↓继续消费下一页

###性能数据

|指标|数值|

|------|------|

|并发数|20协程|
|单条耗时|0.5秒|
|1000条耗时|~25秒|
|CPU占用|30%|
|内存占用|150MB|

---

##💡 总结

###框架核心优势

1.**双模式执行**:批量+定时,覆盖历史采集和增量更新
2.**高并发+分布式**:异步协程+Redis队列,支持多机部署
3.**断点续采**:任务持久化+优雅退出+自动重试
4.**资源监控**:实时监控CPU、内存、线程
5.**灵活入库**:自动去重+降级策略+失败持久化
6.**模块解耦**:装饰器链+解析器独立
7.**完善日志**:结构化日志+失败记录

###适用场景

-📊 电商数据采集
-📰 新闻资讯采集
-💰 金融数据采集
-🏢 企业信息采集
-📈 市场数据监控

---

*本文示例代码已开源,有需要可私信或留言,欢迎 Star ⭐*
*最后更新:2026-02-12*

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  1. CONNECT:[ UseTime:0.000487s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000909s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000355s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000181s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000553s ]
  8. SELECT * FROM `article` WHERE `id` = 475235 LIMIT 1 [ RunTime:0.001076s ]
  9. UPDATE `article` SET `lasttime` = 1771835244 WHERE `id` = 475235 [ RunTime:0.006919s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 475235 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000406s ]
  12. SELECT * FROM `article` WHERE `id` > 475235 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000382s ]
  13. SELECT * FROM `article` WHERE `id` < 475235 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002233s ]
  14. SELECT * FROM `article` WHERE `id` < 475235 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000710s ]
  15. SELECT * FROM `article` WHERE `id` < 475235 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001219s ]
0.097209s