Unable to retrieve backends #58
Description
Working in a Rigetti JupyterHub notebook, the following error is occurring and unable to get the backends available for the Rigetti qiskit provider.
Code:
from qiskit_rigetti import RigettiQCSProvider
provider = RigettiQCSProvider()
backend = provider.backends()
Version:
qiskit-rigetti==0.4.5
Error:
ConnectError: [Errno -2] Name or service not known
Stack Trace
ConnectError Traceback (most recent call last)
/opt/conda/lib/python3.9/site-packages/httpx/_exceptions.py in map_exceptions(mapping, **kwargs)
338 try:
--> 339 yield
340 except Exception as exc:
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in _send_single_request(self, request, timeout)
853 with map_exceptions(HTTPCORE_EXC_MAP, request=request):
--> 854 (status_code, headers, stream, ext) = transport.request(
855 request.method.encode(),
/opt/conda/lib/python3.9/site-packages/httpcore/_sync/connection_pool.py in request(self, method, url, headers, stream, ext)
199 try:
--> 200 response = connection.request(
201 method, url, headers=headers, stream=stream, ext=ext
/opt/conda/lib/python3.9/site-packages/httpcore/_sync/connection.py in request(self, method, url, headers, stream, ext)
86 )
---> 87 self.socket = self._open_socket(timeout)
88 self._create_connection(self.socket)
/opt/conda/lib/python3.9/site-packages/httpcore/_sync/connection.py in _open_socket(self, timeout)
107 if self.uds is None:
--> 108 return self.backend.open_tcp_stream(
109 hostname,
/opt/conda/lib/python3.9/site-packages/httpcore/_backends/sync.py in open_tcp_stream(self, hostname, port, ssl_context, timeout, local_address)
143 )
--> 144 return SyncSocketStream(sock=sock)
145
/opt/conda/lib/python3.9/contextlib.py in __exit__(self, typ, value, traceback)
136 try:
--> 137 self.gen.throw(typ, value, traceback)
138 except StopIteration as exc:
/opt/conda/lib/python3.9/site-packages/httpcore/_exceptions.py in map_exceptions(map)
11 if isinstance(exc, from_exc):
---> 12 raise to_exc(exc) from None
13 raise
ConnectError: [Errno -2] Name or service not known
The above exception was the direct cause of the following exception:
ConnectError Traceback (most recent call last)
/tmp/ipykernel_202/1099804041.py in <module>
----> 1 provider.get_backend()
/opt/conda/lib/python3.9/site-packages/qiskit/providers/provider.py in get_backend(self, name, **kwargs)
47 more than one backend matches the filtering criteria.
48 """
---> 49 backends = self.backends(name, **kwargs)
50 if len(backends) > 1:
51 raise QiskitBackendNotFoundError('More than one backend matches the criteria')
/opt/conda/lib/python3.9/site-packages/qiskit_rigetti/_qcs_provider.py in backends(self, name, **__)
66 """
67 if not self._backends:
---> 68 for qpu, data in self._get_quantum_processors().items():
69 configuration = _configuration(qpu, num_qubits=data["num_qubits"], local=False, simulator=False)
70 self._backends.append(
/opt/conda/lib/python3.9/site-packages/qiskit_rigetti/_qcs_provider.py in _get_quantum_processors(self)
110 with build_sync_client(configuration=self._client_configuration) as qcs_client: # type: httpx.Client
111 return cast(
--> 112 Dict[str, Any], qcs_client.get("https://forest-server.qcs.rigetti.com/devices").json()["devices"]
113 )
114
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in get(self, url, params, headers, cookies, auth, allow_redirects, timeout)
898 **Parameters**: See `httpx.request`.
899 """
--> 900 return self.request(
901 "GET",
902 url,
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in request(self, method, url, content, data, files, json, params, headers, cookies, auth, allow_redirects, timeout)
719 cookies=cookies,
720 )
--> 721 return self.send(
722 request, auth=auth, allow_redirects=allow_redirects, timeout=timeout
723 )
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in send(self, request, stream, auth, allow_redirects, timeout)
751 auth = self._build_request_auth(request, auth)
752
--> 753 response = self._send_handling_auth(
754 request,
755 auth=auth,
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in _send_handling_auth(self, request, auth, timeout, allow_redirects, history)
789
790 while True:
--> 791 response = self._send_handling_redirects(
792 request,
793 timeout=timeout,
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in _send_handling_redirects(self, request, timeout, allow_redirects, history)
821 )
822
--> 823 response = self._send_single_request(request, timeout)
824 response.history = list(history)
825
/opt/conda/lib/python3.9/site-packages/httpx/_client.py in _send_single_request(self, request, timeout)
852
853 with map_exceptions(HTTPCORE_EXC_MAP, request=request):
--> 854 (status_code, headers, stream, ext) = transport.request(
855 request.method.encode(),
856 request.url.raw,
/opt/conda/lib/python3.9/contextlib.py in __exit__(self, typ, value, traceback)
135 value = typ()
136 try:
--> 137 self.gen.throw(typ, value, traceback)
138 except StopIteration as exc:
139 # Suppress StopIteration *unless* it's the same exception that
/opt/conda/lib/python3.9/site-packages/httpx/_exceptions.py in map_exceptions(mapping, **kwargs)
354
355 message = str(exc)
--> 356 raise mapped_exc(message, **kwargs) from exc # type: ignore
357
358
ConnectError: [Errno -2] Name or service not known