handlers.py 文件源码

def is_running(self):
        '''Check if our proxied process is still running.'''

        if 'proc' not in self.state:
            return False

        # Check if the process is still around
        proc = self.state['proc']
        if proc.proc.poll() == 0:
            self.log.info('Cannot poll on process.')
            return False

        client = httpclient.AsyncHTTPClient()
        req = httpclient.HTTPRequest('http://localhost:{}'.format(self.port))

        try:
            yield client.fetch(req)
            self.log.debug('Got positive response from rstudio server')
        except:
            self.log.debug('Got negative response from rstudio server')
            return False

        return True