test_rpc_client.py
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	# Copyright (C) 2018-2019 The Software Heritage developers
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	import re

	import pytest
	from requests.exceptions import ConnectionError

	from swh.core.api import APIError, RemoteException, RPCClient, remote_api_endpoint
	from swh.core.api.serializers import exception_to_dict, msgpack_dumps

	from .test_serializers import ExtraType, extra_decoders, extra_encoders


	class ReraiseException(Exception):
	pass


	@pytest.fixture
	def rpc_client(requests_mock):
	class TestStorage:
	@remote_api_endpoint("test_endpoint_url")
	def test_endpoint(self, test_data, db=None, cur=None):
	...

	@remote_api_endpoint("path/to/endpoint")
	def something(self, data, db=None, cur=None):
	...

	@remote_api_endpoint("serializer_test")
	def serializer_test(self, data, db=None, cur=None):
	...

	@remote_api_endpoint("overridden/endpoint")
	def overridden_method(self, data):
	return "foo"

	class Testclient(RPCClient):
	backend_class = TestStorage
	extra_type_encoders = extra_encoders
	extra_type_decoders = extra_decoders
	reraise_exceptions = [ReraiseException]

	def overridden_method(self, data):
	return "bar"

	def callback(request, context):
	assert request.headers["Content-Type"] == "application/x-msgpack"
	context.headers["Content-Type"] = "application/x-msgpack"
	if request.path == "/test_endpoint_url":
	context.content = b"\xa3egg"
	elif request.path == "/path/to/endpoint":
	context.content = b"\xa4spam"
	elif request.path == "/serializer_test":
	context.content = (
	b"\x82\xc4\x07swhtype\xa9extratype"
	b"\xc4\x01d\x92\x81\xa4spam\xa3egg\xa3qux"
	)
	else:
	assert False
	return context.content

	requests_mock.post(re.compile("mock://example.com/"), content=callback)

	return Testclient(url="mock://example.com")


	def test_client(rpc_client):

	assert hasattr(rpc_client, "test_endpoint")
	assert hasattr(rpc_client, "something")

	res = rpc_client.test_endpoint("spam")
	assert res == "egg"
	res = rpc_client.test_endpoint(test_data="spam")
	assert res == "egg"

	res = rpc_client.something("whatever")
	assert res == "spam"
	res = rpc_client.something(data="whatever")
	assert res == "spam"


	def test_client_extra_serializers(rpc_client):
	res = rpc_client.serializer_test(["foo", ExtraType("bar", b"baz")])
	assert res == ExtraType({"spam": "egg"}, "qux")


	def test_client_overridden_method(rpc_client):
	res = rpc_client.overridden_method("foo")
	assert res == "bar"


	def test_client_connexion_error(rpc_client, requests_mock):
	"""
	ConnectionError should be wrapped and raised as an APIError.
	"""
	error_message = "unreachable host"
	requests_mock.post(
	re.compile("mock://example.com/connection_error"),
	exc=ConnectionError(error_message),
	)

	with pytest.raises(APIError) as exc_info:
	rpc_client._post("connection_error", data={})

	assert type(exc_info.value.args[0]) == ConnectionError
	assert str(exc_info.value.args[0]) == error_message


	def _exception_response(exception, status_code, old_exception_schema=False):
	def callback(request, context):
	assert request.headers["Content-Type"] == "application/x-msgpack"
	context.headers["Content-Type"] = "application/x-msgpack"
	exc_dict = exception_to_dict(exception)
	if old_exception_schema:
	exc_dict = {"exception": exc_dict}
	context.content = msgpack_dumps(exc_dict)
	context.status_code = status_code
	return context.content

	return callback


	@pytest.mark.parametrize("old_exception_schema", [False, True])
	def test_client_reraise_exception(rpc_client, requests_mock, old_exception_schema):
	"""
	Exception caught server-side and whitelisted will be raised again client-side.
	"""
	error_message = "something went wrong"
	endpoint = "reraise_exception"

	requests_mock.post(
	re.compile(f"mock://example.com/{endpoint}"),
	content=_exception_response(
	exception=ReraiseException(error_message),
	status_code=400,
	old_exception_schema=old_exception_schema,
	),
	)

	with pytest.raises(ReraiseException) as exc_info:
	rpc_client._post(endpoint, data={})

	assert str(exc_info.value) == error_message


	@pytest.mark.parametrize(
	"status_code, old_exception_schema",
	[
	(400, False),
	(500, False),
	(400, True),
	(500, True),
	],
	)
	def test_client_raise_remote_exception(
	rpc_client, requests_mock, status_code, old_exception_schema
	):
	"""
	Exception caught server-side and not whitelisted will be wrapped and raised
	as a RemoteException client-side.
	"""
	error_message = "something went wrong"
	endpoint = "raise_remote_exception"

	requests_mock.post(
	re.compile(f"mock://example.com/{endpoint}"),
	content=_exception_response(
	exception=Exception(error_message),
	status_code=status_code,
	old_exception_schema=old_exception_schema,
	),
	)

	with pytest.raises(RemoteException) as exc_info:
	rpc_client._post(endpoint, data={})

	assert str(exc_info.value.args[0]["type"]) == "Exception"
	assert str(exc_info.value.args[0]["message"]) == error_message

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