一、前置说明
在Appium的1.6.0版本中引入了AppiumService类，可以很方便的通过该类来管理Appium服务器的启动和停止。经过测试，使用该类的实例执行关闭server时，并没有释放端口号，会导致第二次启动时失败。另外，使用该类启动server，不能在窗口中实时显示日志，不方便调试。因此，可以重写 AppiumService 类的 start 方法和 stop 方法，实现相应功能。
二、代码实现
python
import logging
from appium.webdriver.appium_service import *
from appium.webdriver.appium_service import AppiumService as OriginalServer
from libs import path, file_util
from libs.cmd_util import cmd_executor as cmd
logger = logging.getLogger(__name__)
class AppiumService(OriginalServer):
def __init__(self, port=4723, log_file_path=None, tail_log=False):
super().__init__()
self.port = port
self.log_file_path = log_file_path
# 用于控制是否开启cmd窗口，实时展示日志内容，当调试代码时建议开启
self.tail_log = tail_log
if not self.log_file_path:
self.log_file_path = os.path.join(path.get_log_dir(), f'appium_server_{port}.log')
if os.path.exists(self.log_file_path):
os.remove(self.log_file_path)
self.default_start_args = ['-p', str(self.port),
'-g', self.log_file_path,
'--session-override',
'--log-timestamp',
'--session-override',
'--local-timezone',
'--allow-insecure',
'chromedriver_autodownload'
]
def start(self, **kwargs: Any) -> sp.Popen:
self.stop()
env = kwargs['env'] if 'env' in kwargs else None
node: str = kwargs.get('node') or get_node()
npm: str = kwargs.get('npm') or get_npm()
main_script: str = kwargs.get('main_script') or get_main_script(node, npm)
# A workaround for https://github.com/appium/python-client/issues/534
default_std = sp.DEVNULL if sys.platform == 'win32' else sp.PIPE
stdout = kwargs['stdout'] if 'stdout' in kwargs else default_std
stderr = kwargs['stderr'] if 'stderr' in kwargs else default_std
timeout_ms = int(kwargs['timeout_ms']) if 'timeout_ms' in kwargs else STARTUP_TIMEOUT_MS
args: List[str] = [node, main_script]
if 'args' in kwargs:
args.extend(kwargs['args'])
# ==================添加这段逻辑（开始）：设置默认启动参数=======================
if self.port:
args.extend(self.default_start_args)
# ==================添加这段逻辑（结束）：设置默认启动参数=======================
self._cmd = args
self._process = sp.Popen(args=args, stdout=stdout, stderr=stderr, env=env)
error_msg: Optional[str] = None
startup_failure_msg = (
'Appium server process is unable to start. Make sure proper values have been '
f'provided to \'node\' ({node}), \'npm\' ({npm}) and \'main_script\' ({main_script}) '
f'method arguments.'
)
if timeout_ms > 0:
status_url_path = make_status_url(args)
try:
if not self._poll_status(parse_host(args), parse_port(args), status_url_path, timeout_ms):
error_msg = (
f'Appium server has started but is not listening on {status_url_path} '
f'within {timeout_ms}ms timeout. Make sure proper values have been provided '
f'to --base-path, --address and --port process arguments.'
)
except AppiumStartupError:
error_msg = startup_failure_msg
elif not self.is_running:
error_msg = startup_failure_msg
if error_msg is not None:
if stderr == sp.PIPE and self._process.stderr is not None:
err_output = self._process.stderr.read()
if err_output:
error_msg += f'\nOriginal error: {str(err_output)}'
self.stop()
raise AppiumServiceError(error_msg)
# ==================添加这段逻辑（开始）：是否启动cmd窗口跟踪log日志=======================
if self.tail_log:
file_util.tail_log_file(self.log_file_path)
# ==================添加这段逻辑（结束）：是否启动cmd窗口跟踪log日志=======================
return self._process
def stop(self) -> bool:
status = super().stop()
# 经过实测，原stop()方法执行之后，进程仍被占用，所以这里添加一个关闭进程的逻辑
cmd.kill_process_by_port(self.port)
return status
if __name__ == '__main__':
logging.basicConfig(level=logging.INFO)
service = AppiumService(port=4723, tail_log=True)
service.start()三、Demo验证
执行代码，顺利启动appium server，并启动了一个命令行窗口，实时展示了server的日志。
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