python - 's' 的参数必须是 Python 3.8 中的字节对象
问题描述
为什么argument for 's' must be a bytes object
在尝试运行 lambda 函数时出现错误?我正在关注使用示例,但出现此错误。对此问题的任何解释以及如何解决?
{
"errorMessage": "Failed sending data.\nERROR: argument for 's' must be a bytes object",
"errorType": "Exception",
"stackTrace": [
" File \"/var/task/AlertMetricSender.py\", line 5, in lambda_handler\n sender.send()\n",
" File \"/var/task/modules/ZabbixSender.py\", line 91, in send\n self.__active_checks()\n",
" File \"/var/task/modules/ZabbixSender.py\", line 79, in __active_checks\n response = self.__request(request)\n",
" File \"/var/task/modules/ZabbixSender.py\", line 59, in __request\n raise Exception(\"Failed sending data.\\nERROR: %s\" % e)\n"
]
}
ZabbixSender.py:
#
# For sending metric value to zabbix server.
#
# You must create item as "zabbix trapper" on server.
# Because the server must be connected to agent:10050, if it is selected "zabbix agent".
#
# Usage:
# from modules.ZabbixSender import ZabbixSender
# ZABBIX_HOST = "zabbix.example.com"
# ZABBIX_PORT = 10051
# sender = ZabbixSender(ZABBIX_HOST, ZABBIX_PORT)
# sender.add("example-hostname-01", "healthcheck", 1)
# sender.add("example-hostname-01", "item.keyname", 0.123)
# sender.add("example-hostname-02", "item.keyname", 1234)
# sender.send()
#
import socket
import struct
import time
import json
class ZabbixSender:
log = True
def __init__(self, host='127.0.0.1', port=10051):
self.address = (host, port)
self.data = []
def __log(self, log):
if self.log: print(log)
def __connect(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
self.sock.connect(self.address)
except:
raise Exception("Can't connect server.")
def __close(self):
self.sock.close()
def __pack(self, request):
string = json.dumps(request)
header = struct.pack('<4sBQ', 'ZBXD', 1, len(string))
return header + string
def __unpack(self, response):
header, version, length = struct.unpack('<4sBQ', response[:13])
(data, ) = struct.unpack('<%ds'%length, response[13:13+length])
return json.loads(data)
def __request(self, request):
self.__connect()
try:
self.sock.sendall(self.__pack(request))
except Exception as e:
raise Exception("Failed sending data.\nERROR: %s" % e)
response = ''
while True:
data = self.sock.recv(4096)
if not data:
break
response += data
self.__close()
return self.__unpack(response)
def __active_checks(self):
hosts = set()
for d in self.data:
hosts.add(d['host'])
for h in hosts:
request = {"request":"active checks", "host":h}
self.__log("[active check] %s" % h)
response = self.__request(request)
if not response['response'] == 'success': self.__log("[host not found] %s" % h)
def add(self, host, key, value, clock=None):
if clock is None: clock = int(time.time())
self.data.append({"host":host, "key":key, "value":value, "clock":clock})
def send(self):
if not self.data:
self.__log("Not found sender data, end without sending.")
return False
self.__active_checks()
request = {"request":"sender data", "data":self.data}
response = self.__request(request)
result = True if response['response'] == 'success' else False
if result:
for d in self.data:
self.__log("[send data] %s" % d)
self.__log("[send result] %s" % response['info'])
else:
raise Exception("Failed send data.")
return result
if __name__ == '__main__':
sender = ZabbixSender()
sender.add("gedowfather-example-01", "healthcheck", 1)
sender.add("gedowfather-example-01", "gedow.item", 1111)
sender.send()
AlertMetricSender.py:
from modules.ZabbixSender import ZabbixSender
def lambda_handler(event, context):
sender = ZabbixSender("10.10.10.10", 10051)
sender.add("Zabbix server", "lambda.test", 5)
sender.send()
解决方案
错误来自struct.pack
. 你没有看到,因为你的毯子try
/ except
。
所有套接字活动都是在字节字符串中完成的,而不是 Unicode 字符串。你需要这个:
def __pack(self, request):
string = json.dumps(request).encode('utf-8')
header = b'ZBXD' + struct.pack('<BQ', 1, len(string))
return header + string
关于这一点的一件微妙的事情:您必须在执行 len(string) 之前转换为字节字符串。转换为 UTF-8 很可能会增加字符串中的字符数。
我绝对需要对此发表评论:
result = True if response['response'] == 'success' else False
是什么让你写了这个?这与更自然的阅读方式完全相同:
result = response['response'] == 'success'
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