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Python Flask 实现实时服务器日志监控

  • 2026-01-11 08:36:27
Python Flask 实现实时服务器日志监控
大家好,在前段时间我们演示了Flask的几个实战,今天我们再来给Flask项目的Web界面加一个实时日志控制台。具体实现过程大致如下:后端用环形缓冲区、简单的REST接口,前端用浏览器来轮询。
首先看一些整体架构逻辑图
客户端会记录最后一次的日志ID,每次只需要 请求比这个ID更新的日志,服务器不需要跟踪客户端状态。
Flask会用多线程处理请求,所以缓冲区部分必须要保证线程安全,Python的deque设置maxlength后,天然就是个环形缓冲区,当队列满了,最旧的元素会自动被丢弃。
import loggingfrom collections import dequefrom datetime import datetimeimport threadingclass LogBuffer:    def __init__(self, max_size=500):        self.buffer = deque(maxlen=max_size)        self.lock = threading.Lock()        self.last_id = 0    def add(self, level, message):        with self.lock:            self.last_id += 1            self.buffer.append({                'id'self.last_id,                'time': datetime.now().strftime('%H:%M:%S'),                'level': level,                'message': message            })    def get_logs(self, since_id=0):        with self.lock:            return [log for log in self.buffer if log['id'] > since_id]    def clear(self):        with self.lock:            self.buffer.clear()log_buffer = LogBuffer(max_size=500)
这里要注意,即便清空缓冲区,last_id 也不会被重置,比如客户端记住了since_id = 47,而我们把计数器重置0,就会出问题,客户端一直请求大于47的日志,但是服务器却没有,这就会导致日志流中断。因此要保持计数器单调递增。
接下来我们要自定义一个日志处理器,把日志消息推送到缓冲区
class BufferHandler(logging.Handler):    def __init__(self, log_buffer):        super().__init__()        self.log_buffer = log_buffer    def emit(self, record):        try:            message = self.format(record)            level = record.levelname.lower()            # 映射到前端使用的CSS类名            level_map = {                'debug''info',                'info''info'                'warning''warning',                'error''error',                'critical''error'            }            self.log_buffer.add(level_map.get(level, 'info'), message)        except Exception:            self.handleError(record)
在Flask应用中把这个处理器附加到根日志器:
import loggingfrom log_buffer import log_buffer, BufferHandlerbuffer_handler = BufferHandler(log_buffer)buffer_handler.setFormatter(logging.Formatter('%(name)s - %(message)s'))logging.getLogger().addHandler(buffer_handler)
如此一来,任何地方用logger.info ,日志都会被放入缓冲区。
实现API接口
from flask import Blueprint, request, jsonifyfrom log_buffer import log_bufferapi = Blueprint('api', __name__)@api.route('/api/get-server-logs')def get_server_logs():    since_id = request.args.get('since_id'0type=int)    logs = log_buffer.get_logs(since_id)    return jsonify({'success'True'logs': logs})@api.route('/api/clear-server-logs', methods=['POST'])def clear_server_logs():    log_buffer.clear()    return jsonify({'success'True})
前端轮询逻辑实现:
let lastServerLogId = 0;let pollingInterval = null;async function fetchServerLogs() {    try {        const response = await fetch(            `/api/get-server-logs?since_id=${lastServerLogId}`        );        const data = await response.json();        if (data.success && data.logs.length > 0) {            data.logs.forEach(log => {                appendLogEntry(log);                lastServerLogId = Math.max(lastServerLogId, log.id);            });        }    } catch (err) {        console.error('Log fetch failed:', err);    }}function appendLogEntry(log) {    const container = document.getElementById('logConsole');    const div = document.createElement('div');    div.className = 'log-entry ' + log.level;    div.textContent = '[' + log.time + '] ' + log.message;    container.insertBefore(div, container.firstChild);    // 限制DOM元素数量,和后端缓冲区保持一致    while (container.children.length > 500) {        container.removeChild(container.lastChild);    }}function startPolling() {    if (!pollingInterval) {        fetchServerLogs();        pollingInterval = setInterval(fetchServerLogs, 2000);    }}function stopPolling() {    if (pollingInterval) {        clearInterval(pollingInterval);        pollingInterval = null;    }}// 标签页隐藏时暂停轮询,显示时恢复document.addEventListener('visibilitychange'() => {    document.hidden ? stopPolling() : startPolling();});document.addEventListener('DOMContentLoaded', startPolling);
前端HTML和CSS
<divclass="log-console-wrapper">    <divclass="log-header">        <span>Server Logs</span>        <buttononclick="clearLogs()">Clear</button>    </div>    <divid="logConsole"class="log-console"></div></div>
.log-console {    background#1e1e1e;    color#d4d4d4;    font-family: Consolas, Monaco, monospace;    font-size12px;    padding10px;    height300px;    overflow-y: auto;    border-radius4px;}.log-entry {    padding2px 0;    border-bottom1px solid #333;}.log-entry.warning { color#dcdcaa; }.log-entry.error { color#f48771; }
基本代码逻辑之后,还要有一个权衡点,例如轮询间隔使用2秒,既能即使更新,也不会太抢占资源。另外就是缓冲区的大小控制,不要占用太多内存。需要注意的是我们没有做持久化,因此只能看实时的日志,服务重启后日志会丢失。
总之,有兴趣的话,可以参考这个程序来自己实现一次。

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  1. CONNECT:[ UseTime:0.000471s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000630s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000622s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000475s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000510s ]
  8. SELECT * FROM `article` WHERE `id` = 459853 LIMIT 1 [ RunTime:0.000392s ]
  9. UPDATE `article` SET `lasttime` = 1770587019 WHERE `id` = 459853 [ RunTime:0.009538s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000847s ]
  12. SELECT * FROM `article` WHERE `id` > 459853 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000396s ]
  13. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001990s ]
  14. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002779s ]
  15. SELECT * FROM `article` WHERE `id` < 459853 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000965s ]
0.088517s