NPO-Accounting/oxrlib Changeset - 1927a1812033

Changeset - 1927a1812033

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Brett Smith - 7 years ago 2017-05-12 11:40:27
brettcsmith@brettcsmith.org

loaders: Add LoaderChain.

4 files changed with 115 insertions and 5 deletions:

oxrlib/loaders.py

tests/__init__.py

tests/test_LoaderChain.py

tests/test_OXRAPIRequest.py

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oxrlib/loaders.py

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 import cgi
 import functools
 import io
 import urllib.request
 import urllib.parse
@@ ... / @@ -19,6 +20,10 @@ class LoaderSourceError(LoaderError): @@
     pass
 class NoLoadersError(Exception):
     pass
 class FileCache:
     def __init__(self, dir_path, filename_pattern):
         self.dir_path = dir_path
@@ ... / @@ -75,3 +80,32 @@ class OXRAPIRequest: @@
             'historical/{}.json'.format(date.isoformat()),
             {'app_id': self.app_id, 'base': base},
+        )
 class LoaderChain:
     def __init__(self):
         self.loaders = []
     def add_loader(self, loader):
         self.loaders.append(loader)
     def _wrap_load_method(orig_func):
         @functools.wraps(orig_func)
         def load_wrapper(self, *args, **kwargs):
             self.used_loader = None
             error = None
             for loader in self.loaders:
                 try:
                     response = getattr(loader, orig_func.__name__)(*args, **kwargs)
                 except LoaderError as this_error:
                     error = this_error
                 else:
                     self.used_loader = loader
                     return response
             else:
                 raise NoLoadersError() if error is None else error
         return load_wrapper
     @_wrap_load_method
     def historical(self, date, base):
         pass

tests/__init__.py

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 import datetime
 import pathlib
 import random
 import pytest
 TEST_DIR = pathlib.Path(__file__).parent
 def relpath(*parts):
     return TEST_DIR / pathlib.Path(*parts)
 @pytest.fixture
 def any_date():
     return datetime.date.today() - datetime.timedelta(days=730 - random.randint(0, 365))

tests/test_LoaderChain.py

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 new file 100644
 import io
 import pytest
 import oxrlib.loaders
 from . import any_date
 SUCCESS_S = '"success"\n'
 ERROR = oxrlib.loaders.LoaderNoDataError("test")
 class FakeLoader:
     def __init__(self, result):
         self.result = result
     def _respond(self, *args, **kwargs):
         return io.StringIO(self.result)
     def __getattr__(self, name):
         return self._respond
 class FakeErrorLoader(FakeLoader):
     def __init__(self, error):
         self.error = error
     def _respond(self, *args, **kwargs):
         raise self.error
 @pytest.fixture
 def lchain():
     return oxrlib.loaders.LoaderChain()
 @pytest.fixture
 def good_loader():
     return FakeLoader(SUCCESS_S)
 @pytest.fixture
 def error_loader():
     return FakeErrorLoader(ERROR)
 def test_no_loaders(lchain, any_date):
     try:
         lchain.historical(any_date, 'USD')
     except oxrlib.loaders.NoLoadersError:
         pass
     else:
         assert False, "expected NoLoadersError not raised"
 def test_one_with_success(lchain, any_date, good_loader):
     lchain.add_loader(good_loader)
     response = lchain.historical(any_date, 'USD')
     assert response.read(32) == SUCCESS_S
 def test_two_with_success(lchain, any_date, good_loader, error_loader):
     lchain.add_loader(error_loader)
     lchain.add_loader(good_loader)
     response = lchain.historical(any_date, 'USD')
     assert response.read(32) == SUCCESS_S
 @pytest.mark.parametrize('count', [1, 2])
 def test_no_success(lchain, any_date, error_loader, count):
     for _ in range(count):
         lchain.add_loader(error_loader)
     try:
         lchain.historical(any_date, 'USD')
     except type(ERROR) as error:
         assert error is ERROR
     else:
         assert False, "{} not raised".format(type(ERROR).__name__)

tests/test_OXRAPIRequest.py

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 import datetime
 import http.client
 import io
 import json
@@ ... / @@ -10,6 +9,8 @@ import urllib.parse @@
 import pytest
 import oxrlib.loaders
 from . import any_date
 APPID_CHARS = string.ascii_letters + string.digits
 RANDOM_APPID = ''.join(random.choice(APPID_CHARS) for _ in range(32))
 API_ROOT = 'http://[100::]/oxrlibtest/'
@@ ... / @@ -67,10 +68,6 @@ class FakeOpener: @@
 def api_client():
     return oxrlib.loaders.OXRAPIRequest(RANDOM_APPID, API_ROOT)
 @pytest.fixture
 def any_date():
     return datetime.date.today() - datetime.timedelta(days=730 - random.randint(0, 365))
 @pytest.mark.parametrize('base', ['USD', 'JPY'])
 def test_success(api_client, any_date, base):
     body = "Good Test"

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