nginx日志读取

import os


def dl_counter():
    _pointer_file = '/tmp/south'
    _log = 'access.log'

    def get_pointer():
        if os.path.exists(_pointer_file):
            _ln = open(_pointer_file, 'r+').readline()  # 存在则从文件读取
            if int(_ln) > os.path.getsize(_log):  # 指针文件的位置大于日志文件的总位置
                _ln = 0     # 读到末尾，则从0开始
        else:
            _ln = 0   # 指针文件不存在的情况下，从0开始
        return int(_ln)

    def save_pointer(_pointer):   # 非追加型存储指针文件！！！
        open(_pointer_file, 'w').write(_pointer)

    def dl_stats(_logs):
        sdk_dl, app_dl = dict(), dict()
        for line in _logs:
            if 'OK' in line and 'downloads/sdk' in line:
                sdk_dl[line.split()[6]] = 1 if line.split()[6] not in sdk_dl.keys() else sdk_dl[line.split()[6]] + 1  # 如果新值不在字典的dict中，赋值为1，如果在了，则加1
            if 'OK' in line and 'downloads/apps' in line:
                app_dl[line.split()[6]] = 1 if line.split()[6] not in app_dl.keys() else app_dl[line.split()[6]] + 1
        return sdk_dl, app_dl


    with open(_log) as f:
        f.seek(int(get_pointer()), 0)
        save_pointer(str(f.tell()) + '\n')
        pass