Python 主管事件：如何侦听所有或指定进程的进程\u状态\u停止事件

我正在尝试使用supervisord事件来侦听来自由Supervisor管理的进程的

进程\u状态\u停止

事件

我的事件侦听器（

listener.py

）如下所示：

import sys

from supervisor.childutils import listener

def write_stdout(s):
    sys.stdout.write(s)
    sys.stdout.flush()


def write_stderr(s):
    sys.stderr.write(s)
    sys.stderr.flush()


def main():
    while True:
        headers, body = listener.wait(sys.stdin, sys.stdout)
        body = dict([pair.split(":") for pair in body.split(" ")])
        write_stderr("Headers: %r\n" % repr(headers))
        write_stderr("Body: %r\n" % repr(body))
        listener.ok(sys.stdout)

        if headers["eventname"] == "PROCESS_STATE_STOPPED":
            write_stderr("Process state stopped...\n")


if __name__ == '__main__':
    main()

我在

supervisord.conf

中的相应条目如下：

[program:theprogramname]
command=/bin/cat              ; the program (relative uses PATH, can take args)
process_name=%(program_name)s ; process_name expr (default %(program_name)s)
numprocs=1                    ; number of processes copies to start (def 1)
...
[eventlistener:theeventlistenername]
command=python /home/mickm/listener.py    ; the program (relative uses PATH, can take args)
process_name=%(program_name)s_%(process_num)s       ; process_name expr (default %(program_name)s)
numprocs=1                           ; number of processes copies to start (def 1)
events=PROCESS_STATE                 ; event notif. types to subscribe to (req'd)
autorestart=true
redirect_stderr=true

2017-01-13 14:56:36,168 INFO success: theeventlistenername_0 entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2017-01-13 14:56:36,168 INFO success: theprogramname entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2017-01-13 14:57:29,457 INFO exited: theprogramname (terminated by SIGKILL; not expected)
2017-01-13 14:57:30,460 INFO spawned: 'theprogramname' with pid 25788
2017-01-13 14:57:31,462 INFO success: theprogramname entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)

我研究了该领域的其他StackOverflow问题&我试图从以下方面实施公认的解决方案：

但是，当我运行

listener.py

时，它将

READY

输出到SDOUT&不再继续。我已经尝试过停止/启动和重新启动主管监控的进程，但我的脚本没有发现任何问题

为了验证这一点，我：

在终端A中运行我的事件侦听器脚本

在终端B中的

/bin/cat

过程上执行

kill-9

我的主管日志如下：

[program:theprogramname]
command=/bin/cat              ; the program (relative uses PATH, can take args)
process_name=%(program_name)s ; process_name expr (default %(program_name)s)
numprocs=1                    ; number of processes copies to start (def 1)
...
[eventlistener:theeventlistenername]
command=python /home/mickm/listener.py    ; the program (relative uses PATH, can take args)
process_name=%(program_name)s_%(process_num)s       ; process_name expr (default %(program_name)s)
numprocs=1                           ; number of processes copies to start (def 1)
events=PROCESS_STATE                 ; event notif. types to subscribe to (req'd)
autorestart=true
redirect_stderr=true

2017-01-13 14:56:36,168 INFO success: theeventlistenername_0 entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2017-01-13 14:56:36,168 INFO success: theprogramname entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2017-01-13 14:57:29,457 INFO exited: theprogramname (terminated by SIGKILL; not expected)
2017-01-13 14:57:30,460 INFO spawned: 'theprogramname' with pid 25788
2017-01-13 14:57:31,462 INFO success: theprogramname entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)

虽然主管日志知道我的流程已终止：

i） 保持“就绪”提示的

listener.py

未检测到任何内容

ii）主管重新开始处理（如预期）

我想知道为什么侦听器没有为配置文件中定义的程序拾取

PROCESS\u STATE\u STOPPED

事件（根据Supervisor事件）。此外-这是否适用于所有主管管理的流程

---

谢谢。

配置变量重定向\u stderr:

不要在[eventlistener:x]节中设置redirect_stderr=true。 EventListener使用stdout和stdin与Supervisor进行通信。 如果stderr被重定向，来自stderr的输出将干扰 eventlistener协议

这是我的工作脚本：

import sys

from supervisor.childutils import listener

def write_stdout(s):
    sys.stdout.write(s)
    sys.stdout.flush()

def write_stderr(s):
    sys.stderr.write(s)
    sys.stderr.flush()

def main():
    while True:
        headers, body = listener.wait(sys.stdin, sys.stdout)
        body = dict([pair.split(":") for pair in body.split(" ")])

        write_stderr("Headers: %r\n" % repr(headers))
        write_stderr("Body: %r\n" % repr(body))

        if headers["eventname"] == "PROCESS_STATE_STOPPING":
            write_stderr("Process state stopping...\n")

        # acknowledge the event
        write_stdout("RESULT 2\nOK")

但是我相信你不能仅仅通过运行你的脚本来测试它。您的supervisorctl.conf文件有一些特殊的环境变量，如事件，手动运行脚本时不会出现这些变量

如果要测试它，请向侦听器添加一些日志记录：

[eventlistener:theeventlistenername]
command=python /home/mickm/listener.py    ; the program (relative uses PATH, can take args)
process_name=%(program_name)s_%(process_num)s       ; process_name expr (default %(program_name)s)
numprocs=1                           ; number of processes copies to start (def 1)
events=PROCESS_STATE           ; event notif. types to subscribe to (req'd)
autorestart=true
stderr_logfile=errorlogfile
stdout_logfile=applogfile

您还可以调试头文件变量，并可以检查接收到的数据

启用日志记录后，您可以使用stderr_日志文件上的tail-f error.log.path对其进行测试

 Headers: "{'ver': '3.0', 'poolserial': '4', 'len': '71', 'server': 'supervisor', 'eventname': 'PROCESS_STATE_RUNNING', 'serial': '4', 'pool': 'mylistener'}" 
 Body: "{'from_state': 'STARTING', 'processname': 'someprocess', 'pid': '345', 'groupname': 'someprocess'}" 
 Process state running...

当我kil-9时，上面的输出会出现在日志中

此外，标准输出日志文件将记录此类信息：

RESULT 2
OKREADY
RESULT 2
OKREADY
RESULT 2
OKREADY
RESULT 2
OKREADY
RESULT 2
OKREADY

---

您可以重新启动任何supervisorctl进程吗？还是杀了它？并检查是否生成了error.log我知道了，在使用eventlistener时也不要使用redirect\u stderr，检查我的编辑器删除redirct属性时，您必须重新启动整个supervisord服务。在这种情况下，仅进行Supervisorctl更新是不够的。我看不出你已经准备好编写stdout了，我是不是遗漏了什么？你不觉得举个例子很好吗？我们可以简单地复制并粘贴到电脑中。作为一个新手，我需要代码：）