Question

我有一个脚本用于连接到localhost：8080以在dev_appserver实例上运行某些命令。我使用remote_api_stub和httplib.HTTPConnection的组合。在我对api进行任何调用之前，我想确保服务器实际运行。

在python中确定的最佳实践方式是什么：

如果任何 Web服务器在localhost上运行：8080
如果dev_appserver在localhost：8080上运行？

Answer 1

这应该这样做：

import httplib

NO_WEB_SERVER = 0
WEB_SERVER = 1
GAE_DEV_SERVER_1_0 = 2
def checkServer(host, port, try_only_ssl = False):
    hh = None
    connectionType = httplib.HTTPSConnection if try_only_ssl \
                                             else httplib.HTTPConnection
    try:
        hh = connectionType(host, port)
        hh.request('GET', '/_ah/admin')
        resp = hh.getresponse()
        headers = resp.getheaders()
        if headers:
            if (('server', 'Development/1.0') in headers):
                return GAE_DEV_SERVER_1_0|WEB_SERVER
            return WEB_SERVER
    except httplib.socket.error:
        return NO_WEB_SERVER
    except httplib.BadStatusLine:
        if not try_only_ssl:
            # retry with SSL
            return checkServer(host, port, True)
    finally:
        if hh:
            hh.close()
    return NO_WEB_SERVER

print checkServer('scorpio', 22)   # will print 0 an  ssh server
print checkServer('skiathos', 80)  # will print 1 for an apache web server
print checkServer('skiathos', 8080) # will print 3, a GAE Dev Web server
print checkServer('no-server', 80) # will print 0, no server
print checkServer('www.google.com', 80) # will print 1
print checkServer('www.google.com', 443) # will print 1

Answer 2

我有一个使用remote_api执行操作的ant构建脚本。要验证服务器是否正在运行，我只使用curl并确保它没有返回任何错误。

  <target name="-local-server-up">
    <!-- make sure local server is running -->
    <exec executable="curl" failonerror="true">
      <arg value="-s"/>
      <arg value="${local.host}${remote.api}"/>
    </exec>
    <echo>local server running</echo>
  </target>

您可以使用call在Python中执行相同操作（假设您的计算机已卷曲）。

Answer 3

我会选择这样的东西：

import httplib

GAE_DEVSERVER_HEADER = "Development/1.0"

def is_HTTP_server_running(host, port, just_GAE_devserver = False):
   conn= httplib.HTTPConnection(host, port)
   try:
       conn.request('HEAD','/')
       return not just_GAE_devserver or \
             conn.getresponse().getheader('server') == GAE_DEVSERVER_HEADER   
   except (httplib.socket.error, httplib.HTTPException):
       return False
   finally:
       conn.close()

测试：

assert is_HTTP_server_running('yahoo.com','80') == True
assert is_HTTP_server_running('yahoo.com','80', just_GAE_devserver = True) == False
assert is_HTTP_server_running('localhost','8088') == True
assert is_HTTP_server_running('localhost','8088', just_GAE_devserver = True) == True
assert is_HTTP_server_running('foo','8088') == False
assert is_HTTP_server_running('foo','8088', just_GAE_devserver = True) == False

使用python检查dev_appserver是否在localhost上运行

3 个答案: