Question

我使用Twisted实现了python SMTP服务器和客户端。当我在本地测试它们时，即使用localhost，一切都很完美。但是，我想在分布式环境中检查它。因此，我运行了一个EC2 Amazon实例，我在其上启动了我的SMTP服务器作为应用程序，如下所示

factory = StdoutSMTPFactory("./tmp/mail")
tcp_server = internet.TCPServer(2500, factory)
application = service.Application("SMTPServer")
tcp_server.setServiceParent(application)

其中StdoutSMTPFactory是我的工厂构建我的SMTP服务器的实现。我的SMTP客户端如下所示：

import sys
from email.mime.text import MIMEText
from twisted.internet import reactor
from twisted.mail.smtp import sendmail
from twisted.python import log

log.startLogging(sys.stdout)

host = "ec2-X-X-X-X.eu-west-1.compute.amazonaws.com"
sender = "secretsender@example.com"
recipients = ["ubuntu@ec2-X-X-X-X.eu-west-1.compute.amazonaws.com"]

msg = MIMEText("""Test message
from SenderX
""")
msg["Subject"] = "Title"
msg["From"] = '"Secret Sender" <%s>' % (sender,)
msg["To"] = ", ".join(recipients)

deferred = sendmail(host, sender, recipients, msg.as_string(), port=2500)
deferred.addBoth(lambda result: reactor.stop())

reactor.run()

其中ec2-X-X-X-X.eu-west-1.compute.amazonaws.com当然是我的EC2实例的有效主机名，只是为帖子隐藏了。当我尝试向我的实例发送电子邮件时，我获得以下内容：

[-] Log opened.
[-] Starting factory <twisted.mail.smtp.ESMTPSenderFactory instance at 0x10815d638>
[Uninitialized] SMTP Client retrying server. Retry: 5
[Uninitialized] SMTP Client retrying server. Retry: 4
[Uninitialized] SMTP Client retrying server. Retry: 3
[Uninitialized] SMTP Client retrying server. Retry: 2
[Uninitialized] SMTP Client retrying server. Retry: 1
[-] Stopping factory <twisted.mail.smtp.ESMTPSenderFactory instance at 0x10815d638>
[-] Main loop terminated.

服务器或客户端都没有错误。只是看起来客户端无法连接到服务器。有人可以建议我做错了什么吗？

Answer 1

您的代码中包含：

deferred.addBoth(lambda result: reactor.stop())

这是同步Python代码的延迟等价物：

try:
    ...
except:
    pass
reactor.stop()

如果您想查看错误，请在Deferred上对传递给errback的参数执行某些操作。

from twisted.logger import Logger
logger = Logger()

deferred.addErrback(partial(logger.failure, "sending mail"))
deferred.addCallback(lambda ignored: reactor.stop())

或者考虑使用react

from twisted.internet.task import react

def main(reactor):
    ...
    return sendmail(host, sender, recipients, msg.as_string(), port=2500)

react(main, [])

将为您执行错误报告。

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