不懂就问: django 不是一个请求就是一个生命周期吗? 为什么还会有 Too many open files 的错误

一个从远程获取安装日志, 以文件流的形式返回前端的逻辑
先贴代码:

class LogFile(LoginRequiredMixin, View): """获取日志文件 """ def get(self, request, *args, **kwargs): data = json.loads(request.GET.get('data', '{}')) host = data.get('host', None) user = data.get('user', None) pwd = data.get('password', None) if host and user and pwd: c = Connection(host, user, connect_kwargs={'password': pwd}) try: logs = c.run( 'ls -t ' + DEPLOYMENT_LOG_PATH + ' | grep install', pty=True) logs = logs.stdout.split('\n') return JsonResponse({'logs': logs}) except (AuthenticationException, NoValidConnectionsError, UnexpectedExit) as e: return JsonResponse({'error': e.__str__()}) else: return HttpResponse(0) def post(self, request, *args, **kwargs): data = json.loads(request.POST.get('data', '{}')) host = data.get('host', None) user = data.get('user', None) pwd = data.get('password', None) seek = data.get('seek', None) log_name = data.get('logfile', None) log_name = log_name[:-1] if log_name else None if host and log_name and (isinstance(seek, int) or seek.isdigit()): if not (user and pwd) and (user or pwd): return JsonResponse({'error': 'args error'}) elif user and pwd: c = Connection(host, user, connect_kwargs={'password': pwd}) try: c.get(DEPLOYMENT_LOG_PATH + log_name, '%s/log/%s' % ( settings.BASE_DIR, log_name)) log_file = '%s/log/%s' % (settings.BASE_DIR, log_name) except (IOError, AuthenticationException, NoValidConnectionsError, UnexpectedExit) as e: return JsonResponse({'error': e.__str__()}) else: log_file = '/var/log/' + log_name def read_log(log_file): with open(log_file, 'rb') as f: f.seek(0, 2) if f.tell() == int(seek): yield '\nseek:' + seek else: f.seek(int(seek)) while 1: log = f.read(512) if log: yield log else: break yield '\nseek:' + str(f.tell()) os.remove(log_file) respOnse= StreamingHttpResponse(read_log(log_file)) return response else: return JsonResponse({'error': 'args error'}) 

前端在迭代完之后,会等待 2 秒再发送下一个请求, 在匹配到安装完成的关键字后就不再请求
上周五走的时候,放着测试
21:13:22 开始查看日志
21:53:18 返回的错误信息
错误信息在这一段

c = Connection(host, user, connect_kwargs={'password': pwd}) try: c.get(DEPLOYMENT_LOG_PATH + log_name, '%s/log/%s' % ( settings.BASE_DIR, log_name)) log_file = '%s/log/%s' % (settings.BASE_DIR, log_name) except (IOError, AuthenticationException, NoValidConnectionsError, UnexpectedExit) as e: return JsonResponse({'error': e.__str__()}) 

查了一下说是达到了系统限制的打开文件句柄数量
但奇怪的是,我的逻辑是每次获取请求后,
拉取文件,读文件,关闭文件,删除文件,
按说,一个请求结束,文件也就没了,打开的文件句柄也就没了呀,
怎么会报这个错呢?
难道说, 要整个 django 进程都关闭了才算?