无法从 Gearman 客户端实例中捕获异常

Question

连接到 gearman 守护进程时，如果守护进程 url 或端口不正确，无法进行连接，则会引发异常：

      File "/usr/lib/python2.7/dist-packages/gearman/client.py", line 205, in establish_request_connection
    raise ServerUnavailable('Found no valid connections: %r' % self.connection_list)

gearman.errors.ServerUnavailable: Found no valid connections: [<GearmanConnection localhost:4700 connected=False>]

我想捕捉异常并优雅地处理它，但下面的代码并没有这样做。显示异常和回溯，就好像我没有尝试捕获异常一样。

生成并尝试捕获异常的代码是：

import gearman
from gearman.errors import ConnectionError, InvalidAdminClientState, ServerUnavailable
try:
    gmClient = gearman.GearmanClient(['localhost:4730'])
except gearman.errors.ServerUnavailable, e:
# I've also tried except ServerUnavailable, e: - same result.
    print(e)

如何正确捕获 gearman 客户端连接异常？

Answer 1

当您尝试提交作业时会引发 ServerUnavailable 异常。试试这个：

import gearman

gmClient = gearman.GearmanClient(['localhost:4700'])

try:
    request = gmClient.submit_job('reverse', 'Hello World!')
except gearman.errors.ServerUnavailable, e:
    print("caught ServerUnavailable")