Pyro4 [Errno -2]
Pyro4 [Errno -2]
我正在尝试我的 PC 和 Raspberry Pi 4 之间的 pyro4 连接。
我电脑上的代码是：
# saved as server.py
import Pyro4, Pyro4.naming
import socket, threading
# Define an object that will be accessible over the network.
# This is where all your code should go...
@Pyro4.expose
class MessageServer(object):
def show_message(self, msg):
print("Message received: {}".format(msg))
# Start a Pyro nameserver and daemon (server process) that are accessible
# over the network. This has security risks; see
# https://pyro4.readthedocs.io/en/stable/security.html
hostname = socket.gethostname()
ns_thread = threading.Thread(
target=Pyro4.naming.startNSloop, kwargs={'host': hostname}
)
ns_thread.daemon = True # automatically exit when main program finishes
ns_thread.start()
main_daemon = Pyro4.Daemon(host=hostname)
# find the name server
ns = Pyro4.locateNS()
# register the message server as a Pyro object
main_daemon_uri = main_daemon.register(MessageServer)
# register a name for the object in the name server
ns.register("example.message", main_daemon_uri)
# start the event loop of the main_daemon to wait for calls
print("Message server ready.")
main_daemon.requestLoop()
我的 Raspberry 上的代码是：
import Pyro4
import sys
print("Message:")
msg=sys.stdin.readline().strip()
message_server = Pyro4.Proxy("PYRONAME:192.168.1.5")
message_server.show_message(msg)
我 PC 上的代码没有显示任何错误，但是当我尝试从 raspberry 发送消息时，我得到了这个：
What s your message?
test
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 102, in getIpAddress
return getaddr(config.PREFER_IP_VERSION) if ipVersion is None else getaddr(ipVersion)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 94, in getaddr
ip = socket.getaddrinfo(hostname or socket.gethostname(), 80, family, socket.SOCK_STREAM, socket.SOL_TCP)[0][4][0]
File "/usr/lib/python3.7/socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 515, in connect_and_handshake
sslContext=sslContext)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 266, in createSocket
if getIpVersion(connect[0]) == 4:
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 68, in getIpVersion
address = getIpAddress(hostnameOrAddress)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 106, in getIpAddress
return getaddr(0)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 94, in getaddr
ip = socket.getaddrinfo(hostname or socket.gethostname(), 80, family, socket.SOCK_STREAM, socket.SOL_TCP)[0][4][0]
File "/usr/lib/python3.7/socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/pi/Desktop/client.py", line 10, in <module>
message_server.show_message(msg)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 275, in __getattr__
self._pyroGetMetadata()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 615, in _pyroGetMetadata
self.__pyroCreateConnection()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 588, in __pyroCreateConnection
uri = _resolve(self._pyroUri, self._pyroHmacKey)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 1915, in _resolve
return nameserver.lookup(uri.object)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 275, in __getattr__
self._pyroGetMetadata()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 615, in _pyroGetMetadata
self.__pyroCreateConnection()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 596, in __pyroCreateConnection
connect_and_handshake(conn)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 549, in connect_and_handshake
raise ce
Pyro4.errors.CommunicationError: cannot connect to ('JAKOB-PC', 9090): [Errno -2] Name or service not known
我的 PC 已禁用防火墙，因此应该没有任何问题。我的本地ip是192.168.1.5。
我正在使用无头树莓派，并使用 PuTTY 和 VNC 在其上编写代码。
我用谷歌搜索了这个错误，但找不到任何答案。任何帮助将不胜感激。
我做到了
#
# Server.py
#
from __future__ import print_function
import Pyro4
@Pyro4.expose
@Pyro4.behavior(instance_mode="single")
class Messenger(object):
# This is a constructor
def __init__(self):
pass
# This method will be called on the server
def send_message(self, name, message):
print("[{0}] {1}".format(name, message))
def main():
Pyro4.Daemon.serveSimple(
{
Messenger: "example.messenger"
},
ns=True)
if __name__ == "__main__":
main()
#
# Client.py
#
# This is the code that visits the warehouse.
import sys
import Pyro4
import Pyro4.util
sys.excepthook = Pyro4.util.excepthook
messenger = Pyro4.Proxy("PYRONAME:example.messenger@192.168.1.5")
messenger.send_message("Tim", "Hello!")
然后运行
python -m Pyro4.naming -n 192.168.1.5python Server.pypython Client.py
简而言之，我无法使用 Pyro 解决问题，而且（几乎）没有人提供帮助，所以我决定改用 'websockets'。
您可以阅读文档 here，但我还是会在这里进行解释。
首先你需要两台有网络连接的设备。您还必须 运行 python 3.6.1 对他们两个。之后你还需要安装 websockets 如果你还没有使用 pip install websockets 或者我必须用 pip3 install websockets.
安装它们
服务器上 运行 下方的代码，处理您从客户端发送给它的消息。函数 'hello' 是处理请求并发回响应的简单示例。 'request'是服务器接收到的数据，数据必须是bytes，string on iterable。通过将请求转换为整数、对其求平方并将其转换回字符串来做出响应。然后将此响应发送回客户端。
'start_server' 定义服务器，将定义其行为的函数（hello）， 上的 IP 地址，服务器 运行 正在（192.168.1.117）和 上的端口它将收到请求（8765）。
!/usr/bin/env python
import asyncio
import websockets
print("Running...")
async def hello(websocket, path):
request = await websocket.recv()
print("Request: " + request)
response = str(int(request)*int(request))
await websocket.send(response)
print("Response:" + response)
start_server = websockets.serve(hello, "192.168.1.117", 8765)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()
下一位是客户端代码。 'uri'是服务器的ip和端口。函数 'tellServ' 要求您输入一些数据（'tell' 变量）并将其发送到服务器。之后它等待回复，一旦收到回复，它就会打印出来。在这种情况下，如果我输入数字“6”，服务器将回复“36”。函数循环处于 while 循环中，因此我可以发送多个数字而无需重新启动脚本。
#!/usr/bin/env python
import asyncio
import websockets
uri = "ws://192.168.1.117:8765"
async def tellServ():
async with websockets.connect(uri) as websocket:
tell = input("Podatek ki ga posles: ")
await websocket.send(tell)
reply = await websocket.recv()
print("Odgovor:")
print(reply)
while 1:
asyncio.get_event_loop().run_until_complete(tellServ())
我正在尝试我的 PC 和 Raspberry Pi 4 之间的 pyro4 连接。
我电脑上的代码是：
# saved as server.py
import Pyro4, Pyro4.naming
import socket, threading
# Define an object that will be accessible over the network.
# This is where all your code should go...
@Pyro4.expose
class MessageServer(object):
def show_message(self, msg):
print("Message received: {}".format(msg))
# Start a Pyro nameserver and daemon (server process) that are accessible
# over the network. This has security risks; see
# https://pyro4.readthedocs.io/en/stable/security.html
hostname = socket.gethostname()
ns_thread = threading.Thread(
target=Pyro4.naming.startNSloop, kwargs={'host': hostname}
)
ns_thread.daemon = True # automatically exit when main program finishes
ns_thread.start()
main_daemon = Pyro4.Daemon(host=hostname)
# find the name server
ns = Pyro4.locateNS()
# register the message server as a Pyro object
main_daemon_uri = main_daemon.register(MessageServer)
# register a name for the object in the name server
ns.register("example.message", main_daemon_uri)
# start the event loop of the main_daemon to wait for calls
print("Message server ready.")
main_daemon.requestLoop()
我的 Raspberry 上的代码是：
import Pyro4
import sys
print("Message:")
msg=sys.stdin.readline().strip()
message_server = Pyro4.Proxy("PYRONAME:192.168.1.5")
message_server.show_message(msg)
我 PC 上的代码没有显示任何错误，但是当我尝试从 raspberry 发送消息时，我得到了这个：
What s your message?
test
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 102, in getIpAddress
return getaddr(config.PREFER_IP_VERSION) if ipVersion is None else getaddr(ipVersion)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 94, in getaddr
ip = socket.getaddrinfo(hostname or socket.gethostname(), 80, family, socket.SOCK_STREAM, socket.SOL_TCP)[0][4][0]
File "/usr/lib/python3.7/socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 515, in connect_and_handshake
sslContext=sslContext)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 266, in createSocket
if getIpVersion(connect[0]) == 4:
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 68, in getIpVersion
address = getIpAddress(hostnameOrAddress)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 106, in getIpAddress
return getaddr(0)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/socketutil.py", line 94, in getaddr
ip = socket.getaddrinfo(hostname or socket.gethostname(), 80, family, socket.SOCK_STREAM, socket.SOL_TCP)[0][4][0]
File "/usr/lib/python3.7/socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/pi/Desktop/client.py", line 10, in <module>
message_server.show_message(msg)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 275, in __getattr__
self._pyroGetMetadata()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 615, in _pyroGetMetadata
self.__pyroCreateConnection()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 588, in __pyroCreateConnection
uri = _resolve(self._pyroUri, self._pyroHmacKey)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 1915, in _resolve
return nameserver.lookup(uri.object)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 275, in __getattr__
self._pyroGetMetadata()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 615, in _pyroGetMetadata
self.__pyroCreateConnection()
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 596, in __pyroCreateConnection
connect_and_handshake(conn)
File "/home/pi/.local/lib/python3.7/site-packages/Pyro4/core.py", line 549, in connect_and_handshake
raise ce
Pyro4.errors.CommunicationError: cannot connect to ('JAKOB-PC', 9090): [Errno -2] Name or service not known
我的 PC 已禁用防火墙，因此应该没有任何问题。我的本地ip是192.168.1.5。 我正在使用无头树莓派，并使用 PuTTY 和 VNC 在其上编写代码。
我用谷歌搜索了这个错误，但找不到任何答案。任何帮助将不胜感激。
我做到了
#
# Server.py
#
from __future__ import print_function
import Pyro4
@Pyro4.expose
@Pyro4.behavior(instance_mode="single")
class Messenger(object):
# This is a constructor
def __init__(self):
pass
# This method will be called on the server
def send_message(self, name, message):
print("[{0}] {1}".format(name, message))
def main():
Pyro4.Daemon.serveSimple(
{
Messenger: "example.messenger"
},
ns=True)
if __name__ == "__main__":
main()
#
# Client.py
#
# This is the code that visits the warehouse.
import sys
import Pyro4
import Pyro4.util
sys.excepthook = Pyro4.util.excepthook
messenger = Pyro4.Proxy("PYRONAME:example.messenger@192.168.1.5")
messenger.send_message("Tim", "Hello!")
然后运行
python -m Pyro4.naming -n 192.168.1.5python Server.pypython Client.py
简而言之，我无法使用 Pyro 解决问题，而且（几乎）没有人提供帮助，所以我决定改用 'websockets'。
您可以阅读文档 here，但我还是会在这里进行解释。
首先你需要两台有网络连接的设备。您还必须 运行 python 3.6.1 对他们两个。之后你还需要安装 websockets 如果你还没有使用 pip install websockets 或者我必须用 pip3 install websockets.
服务器上 运行 下方的代码，处理您从客户端发送给它的消息。函数 'hello' 是处理请求并发回响应的简单示例。 'request'是服务器接收到的数据，数据必须是bytes，string on iterable。通过将请求转换为整数、对其求平方并将其转换回字符串来做出响应。然后将此响应发送回客户端。 'start_server' 定义服务器，将定义其行为的函数（hello）， 上的 IP 地址，服务器 运行 正在（192.168.1.117）和 上的端口它将收到请求（8765）。
!/usr/bin/env python
import asyncio
import websockets
print("Running...")
async def hello(websocket, path):
request = await websocket.recv()
print("Request: " + request)
response = str(int(request)*int(request))
await websocket.send(response)
print("Response:" + response)
start_server = websockets.serve(hello, "192.168.1.117", 8765)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()
下一位是客户端代码。 'uri'是服务器的ip和端口。函数 'tellServ' 要求您输入一些数据（'tell' 变量）并将其发送到服务器。之后它等待回复，一旦收到回复，它就会打印出来。在这种情况下，如果我输入数字“6”，服务器将回复“36”。函数循环处于 while 循环中，因此我可以发送多个数字而无需重新启动脚本。
#!/usr/bin/env python
import asyncio
import websockets
uri = "ws://192.168.1.117:8765"
async def tellServ():
async with websockets.connect(uri) as websocket:
tell = input("Podatek ki ga posles: ")
await websocket.send(tell)
reply = await websocket.recv()
print("Odgovor:")
print(reply)
while 1:
asyncio.get_event_loop().run_until_complete(tellServ())