使用AppEngine发送邮件时遇到UnicodeDecodeError

Question

我在使用App Engine的mail.EmailMessage，我的subject参数是一个包含非ASCII字符（比如åäö）的Unicode对象。结果出现了以下错误：

Traceback (most recent call last):
  File  "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 765, in emit
    self.stream.write(fs % msg.encode("UTF-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 101: ordinal not in range(128)

我甚至尝试在发送之前自己进行UTF-8编码，但还是遇到了同样的错误。

更新：添加了更多代码：

这个EmailMessage是通过任务队列发送的，使用了以下处理程序：

# Task queue handlers
class MailSender(TemplatedRequestHandler):
    def post(self):
        req = self.request
        subject=req.get('subject')
        recipient=req.get('recipient')
        body=req.get('body')
        logging.info(type(subject))
        logging.info(subject)
        message = mail.EmailMessage(sender=u"ProffsKnuten support <kontakt@proffsknuten.se>", \
            subject=subject, to=recipient, body=body).send()
        logging.info(u'Sent e-mail to %s with subject "%s".', recipient, subject)

这是日志的输出：

INFO     2011-02-21 12:34:53,308 dev_appserver.py:3317] "POST /tasks/mail HTTP/1.1" 200 -
INFO     2011-02-21 12:34:53,329 view.py:696] <type 'unicode'>
INFO     2011-02-21 12:34:53,330 view.py:697] ProffsKnuten.se - Nytt jobb: Bluttan blä
INFO     2011-02-21 12:34:53,330 mail_stub.py:88] MailService.Send
INFO     2011-02-21 12:34:53,330 mail_stub.py:89]   From: ProffsKnuten support <kontakt@proffsknuten.se>
INFO     2011-02-21 12:34:53,330 mail_stub.py:92]   To: [censored]@gmail.com
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 765, in emit
    self.stream.write(fs % msg.encode("UTF-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 101: ordinal not in range(128)
INFO     2011-02-21 12:34:53,333 mail_stub.py:104]   Body:
INFO     2011-02-21 12:34:53,343 mail_stub.py:105]     Content-type: text/plain
INFO     2011-02-21 12:34:53,343 mail_stub.py:106]     Data length: 371
INFO     2011-02-21 12:34:53,343 mail_stub.py:211] You are not currently sending out real email.  If you have sendmail installed you can use it by using the server with --enable_sendmail
INFO     2011-02-21 12:34:53,344 view.py:700] Sent e-mail to [censored]@gmail.com with subject "ProffsKnuten.se - Nytt jobb: Bluttan blä".

更新2：

添加了emit函数的源代码：

def emit(self, record):
    """  
    Emit a record.

    If a formatter is specified, it is used to format the record.
    The record is then written to the stream with a trailing newline.  If
    exception information is present, it is formatted using
    traceback.print_exception and appended to the stream.  If the stream
    has an 'encoding' attribute, it is used to encode the message before
    output to the stream.
    """
    try: 
        msg = self.format(record)
        fs = "%s\n"
        if not hasattr(types, "UnicodeType"): #if no unicode support...
            self.stream.write(fs % msg) 
        else:
            try: 
                if getattr(self.stream, 'encoding', None) is not None:
                    self.stream.write(fs % msg.encode(self.stream.encoding))
                else:
                    self.stream.write(fs % msg) 
            except UnicodeError:
                self.stream.write(fs % msg.encode("UTF-8"))
        self.flush()
    except (KeyboardInterrupt, SystemExit):
        raise
    except:
        self.handleError(record)

error handling unicode app engine utf-8 encoding task queue non-ascii characters email message

使用AppEngine发送邮件时遇到UnicodeDecodeError

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