tests/test_http.py

#!/usr/bin/env python
#
# Copyright 2014 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Http tests

Unit tests for the googleapiclient.http.
"""
from __future__ import absolute_import
from six.moves import range

__author__ = 'jcgregorio@google.com (Joe Gregorio)'

from six import PY3
from six import BytesIO, StringIO
from io import FileIO
from six.moves.urllib.parse import urlencode

# Do not remove the httplib2 import
import httplib2
import logging
import mock
import os
import unittest2 as unittest
import random
import socket
import ssl
import time

from googleapiclient.discovery import build
from googleapiclient.errors import BatchError
from googleapiclient.errors import HttpError
from googleapiclient.errors import InvalidChunkSizeError
from googleapiclient.http import BatchHttpRequest
from googleapiclient.http import HttpMock
from googleapiclient.http import HttpMockSequence
from googleapiclient.http import HttpRequest
from googleapiclient.http import MAX_URI_LENGTH
from googleapiclient.http import MediaFileUpload
from googleapiclient.http import MediaInMemoryUpload
from googleapiclient.http import MediaIoBaseDownload
from googleapiclient.http import MediaIoBaseUpload
from googleapiclient.http import MediaUpload
from googleapiclient.http import _StreamSlice
from googleapiclient.http import set_user_agent
from googleapiclient.model import JsonModel
from oauth2client.client import Credentials


class MockCredentials(Credentials):
  """Mock class for all Credentials objects."""
  def __init__(self, bearer_token):
    super(MockCredentials, self).__init__()
    self._authorized = 0
    self._refreshed = 0
    self._applied = 0
    self._bearer_token = bearer_token

  def authorize(self, http):
    self._authorized += 1

    request_orig = http.request

    # The closure that will replace 'httplib2.Http.request'.
    def new_request(uri, method='GET', body=None, headers=None,
                    redirections=httplib2.DEFAULT_MAX_REDIRECTS,
                    connection_type=None):
      # Modify the request headers to add the appropriate
      # Authorization header.
      if headers is None:
        headers = {}
      self.apply(headers)

      resp, content = request_orig(uri, method, body, headers,
                                   redirections, connection_type)

      return resp, content

    # Replace the request method with our own closure.
    http.request = new_request

    # Set credentials as a property of the request method.
    setattr(http.request, 'credentials', self)

    return http

  def refresh(self, http):
    self._refreshed += 1

  def apply(self, headers):
    self._applied += 1
    headers['authorization'] = self._bearer_token + ' ' + str(self._refreshed)


class HttpMockWithErrors(object):
  def __init__(self, num_errors, success_json, success_data):
    self.num_errors = num_errors
    self.success_json = success_json
    self.success_data = success_data

  def request(self, *args, **kwargs):
    if not self.num_errors:
      return httplib2.Response(self.success_json), self.success_data
    else:
      self.num_errors -= 1
      if self.num_errors == 1:
        raise ssl.SSLError()
      else:
        if PY3:
          ex = TimeoutError()
        else:
          ex = socket.error()
        
        if self.num_errors == 2:
          #first try a broken pipe error (#218)
          ex.errno = socket.errno.EPIPE
        else:
          # Initialize the timeout error code to the platform's error code.
          try:
            # For Windows:
            ex.errno = socket.errno.WSAETIMEDOUT
          except AttributeError:
            # For Linux/Mac:
            ex.errno = socket.errno.ETIMEDOUT
        # Now raise the correct error.
        raise ex


class HttpMockWithNonRetriableErrors(object):
  def __init__(self, num_errors, success_json, success_data):
    self.num_errors = num_errors
    self.success_json = success_json
    self.success_data = success_data

  def request(self, *args, **kwargs):
    if not self.num_errors:
      return httplib2.Response(self.success_json), self.success_data
    else:
      self.num_errors -= 1
      ex = socket.error()
      # set errno to a non-retriable value
      try:
        # For Windows:
        ex.errno = socket.errno.WSAECONNREFUSED
      except AttributeError:
        # For Linux/Mac:
        ex.errno = socket.errno.ECONNREFUSED
      # Now raise the correct timeout error.
      raise ex


DATA_DIR = os.path.join(os.path.dirname(__file__), 'data')


def datafile(filename):
  return os.path.join(DATA_DIR, filename)

class TestUserAgent(unittest.TestCase):

  def test_set_user_agent(self):
    http = HttpMockSequence([
      ({'status': '200'}, 'echo_request_headers'),
      ])

    http = set_user_agent(http, "my_app/5.5")
    resp, content = http.request("http://example.com")
    self.assertEqual('my_app/5.5', content['user-agent'])

  def test_set_user_agent_nested(self):
    http = HttpMockSequence([
      ({'status': '200'}, 'echo_request_headers'),
      ])

    http = set_user_agent(http, "my_app/5.5")
    http = set_user_agent(http, "my_library/0.1")
    resp, content = http.request("http://example.com")
    self.assertEqual('my_app/5.5 my_library/0.1', content['user-agent'])


class TestMediaUpload(unittest.TestCase):

  def test_media_file_upload_mimetype_detection(self):
    upload = MediaFileUpload(datafile('small.png'))
    self.assertEqual('image/png', upload.mimetype())

    upload = MediaFileUpload(datafile('empty'))
    self.assertEqual('application/octet-stream', upload.mimetype())

  def test_media_file_upload_to_from_json(self):
    upload = MediaFileUpload(
        datafile('small.png'), chunksize=500, resumable=True)
    self.assertEqual('image/png', upload.mimetype())
    self.assertEqual(190, upload.size())
    self.assertEqual(True, upload.resumable())
    self.assertEqual(500, upload.chunksize())
    self.assertEqual(b'PNG', upload.getbytes(1, 3))

    json = upload.to_json()
    new_upload = MediaUpload.new_from_json(json)

    self.assertEqual('image/png', new_upload.mimetype())
    self.assertEqual(190, new_upload.size())
    self.assertEqual(True, new_upload.resumable())
    self.assertEqual(500, new_upload.chunksize())
    self.assertEqual(b'PNG', new_upload.getbytes(1, 3))

  def test_media_file_upload_raises_on_invalid_chunksize(self):
    self.assertRaises(InvalidChunkSizeError, MediaFileUpload,
        datafile('small.png'), mimetype='image/png', chunksize=-2,
        resumable=True)

  def test_media_inmemory_upload(self):
    media = MediaInMemoryUpload(b'abcdef', mimetype='text/plain', chunksize=10,
                                resumable=True)
    self.assertEqual('text/plain', media.mimetype())
    self.assertEqual(10, media.chunksize())
    self.assertTrue(media.resumable())
    self.assertEqual(b'bc', media.getbytes(1, 2))
    self.assertEqual(6, media.size())

  def test_http_request_to_from_json(self):

    def _postproc(*kwargs):
      pass

    http = httplib2.Http()
    media_upload = MediaFileUpload(
        datafile('small.png'), chunksize=500, resumable=True)
    req = HttpRequest(
        http,
        _postproc,
        'http://example.com',
        method='POST',
        body='{}',
        headers={'content-type': 'multipart/related; boundary="---flubber"'},
        methodId='foo',
        resumable=media_upload)

    json = req.to_json()
    new_req = HttpRequest.from_json(json, http, _postproc)

    self.assertEqual({'content-type':
                       'multipart/related; boundary="---flubber"'},
                       new_req.headers)
    self.assertEqual('http://example.com', new_req.uri)
    self.assertEqual('{}', new_req.body)
    self.assertEqual(http, new_req.http)
    self.assertEqual(media_upload.to_json(), new_req.resumable.to_json())

    self.assertEqual(random.random, new_req._rand)
    self.assertEqual(time.sleep, new_req._sleep)


class TestMediaIoBaseUpload(unittest.TestCase):

  def test_media_io_base_upload_from_file_io(self):
    fd = FileIO(datafile('small.png'), 'r')
    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)
    self.assertEqual('image/png', upload.mimetype())
    self.assertEqual(190, upload.size())
    self.assertEqual(True, upload.resumable())
    self.assertEqual(500, upload.chunksize())
    self.assertEqual(b'PNG', upload.getbytes(1, 3))

  def test_media_io_base_upload_from_file_object(self):
    f = open(datafile('small.png'), 'rb')
    upload = MediaIoBaseUpload(
        fd=f, mimetype='image/png', chunksize=500, resumable=True)
    self.assertEqual('image/png', upload.mimetype())
    self.assertEqual(190, upload.size())
    self.assertEqual(True, upload.resumable())
    self.assertEqual(500, upload.chunksize())
    self.assertEqual(b'PNG', upload.getbytes(1, 3))
    f.close()

  def test_media_io_base_upload_serializable(self):
    f = open(datafile('small.png'), 'rb')
    upload = MediaIoBaseUpload(fd=f, mimetype='image/png')

    try:
      json = upload.to_json()
      self.fail('MediaIoBaseUpload should not be serializable.')
    except NotImplementedError:
      pass

  @unittest.skipIf(PY3, 'Strings and Bytes are different types')
  def test_media_io_base_upload_from_string_io(self):
    f = open(datafile('small.png'), 'rb')
    fd = StringIO(f.read())
    f.close()

    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)
    self.assertEqual('image/png', upload.mimetype())
    self.assertEqual(190, upload.size())
    self.assertEqual(True, upload.resumable())
    self.assertEqual(500, upload.chunksize())
    self.assertEqual(b'PNG', upload.getbytes(1, 3))
    f.close()

  def test_media_io_base_upload_from_bytes(self):
    f = open(datafile('small.png'), 'rb')
    fd = BytesIO(f.read())
    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)
    self.assertEqual('image/png', upload.mimetype())
    self.assertEqual(190, upload.size())
    self.assertEqual(True, upload.resumable())
    self.assertEqual(500, upload.chunksize())
    self.assertEqual(b'PNG', upload.getbytes(1, 3))

  def test_media_io_base_upload_raises_on_invalid_chunksize(self):
    f = open(datafile('small.png'), 'rb')
    fd = BytesIO(f.read())
    self.assertRaises(InvalidChunkSizeError, MediaIoBaseUpload,
        fd, 'image/png', chunksize=-2, resumable=True)

  def test_media_io_base_upload_streamable(self):
    fd = BytesIO(b'stuff')
    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)
    self.assertEqual(True, upload.has_stream())
    self.assertEqual(fd, upload.stream())

  def test_media_io_base_next_chunk_retries(self):
    f = open(datafile('small.png'), 'rb')
    fd = BytesIO(f.read())
    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)

    # Simulate errors for both the request that creates the resumable upload
    # and the upload itself.
    http = HttpMockSequence([
      ({'status': '500'}, ''),
      ({'status': '500'}, ''),
      ({'status': '503'}, ''),
      ({'status': '200', 'location': 'location'}, ''),
      ({'status': '403'}, USER_RATE_LIMIT_EXCEEDED_RESPONSE),
      ({'status': '403'}, RATE_LIMIT_EXCEEDED_RESPONSE),
      ({'status': '429'}, ''),
      ({'status': '200'}, '{}'),
    ])

    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/upload/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        headers={},
        resumable=upload)

    sleeptimes = []
    request._sleep = lambda x: sleeptimes.append(x)
    request._rand = lambda: 10

    request.execute(num_retries=3)
    self.assertEqual([20, 40, 80, 20, 40, 80], sleeptimes)

  def test_media_io_base_next_chunk_no_retry_403_not_configured(self):
    fd = BytesIO(b"i am png")
    upload = MediaIoBaseUpload(
        fd=fd, mimetype='image/png', chunksize=500, resumable=True)

    http = HttpMockSequence([
        ({'status': '403'}, NOT_CONFIGURED_RESPONSE),
        ({'status': '200'}, '{}')
        ])

    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/upload/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        headers={},
        resumable=upload)

    request._rand = lambda: 1.0
    request._sleep =  mock.MagicMock()

    with self.assertRaises(HttpError):
      request.execute(num_retries=3)
    request._sleep.assert_not_called()


class TestMediaIoBaseDownload(unittest.TestCase):

  def setUp(self):
    http = HttpMock(datafile('zoo.json'), {'status': '200'})
    zoo = build('zoo', 'v1', http=http)
    self.request = zoo.animals().get_media(name='Lion')
    self.fd = BytesIO()

  def test_media_io_base_download(self):
    self.request.http = HttpMockSequence([
      ({'status': '200',
        'content-range': '0-2/5'}, b'123'),
      ({'status': '200',
        'content-range': '3-4/5'}, b'45'),
    ])
    self.assertEqual(True, self.request.http.follow_redirects)

    download = MediaIoBaseDownload(
        fd=self.fd, request=self.request, chunksize=3)

    self.assertEqual(self.fd, download._fd)
    self.assertEqual(3, download._chunksize)
    self.assertEqual(0, download._progress)
    self.assertEqual(None, download._total_size)
    self.assertEqual(False, download._done)
    self.assertEqual(self.request.uri, download._uri)

    status, done = download.next_chunk()

    self.assertEqual(self.fd.getvalue(), b'123')
    self.assertEqual(False, done)
    self.assertEqual(3, download._progress)
    self.assertEqual(5, download._total_size)
    self.assertEqual(3, status.resumable_progress)

    status, done = download.next_chunk()

    self.assertEqual(self.fd.getvalue(), b'12345')
    self.assertEqual(True, done)
    self.assertEqual(5, download._progress)
    self.assertEqual(5, download._total_size)

  def test_media_io_base_download_handle_redirects(self):
    self.request.http = HttpMockSequence([
      ({'status': '200',
        'content-location': 'https://secure.example.net/lion'}, b''),
      ({'status': '200',
        'content-range': '0-2/5'}, b'abc'),
    ])

    download = MediaIoBaseDownload(
        fd=self.fd, request=self.request, chunksize=3)

    status, done = download.next_chunk()

    self.assertEqual('https://secure.example.net/lion', download._uri)

  def test_media_io_base_download_handle_4xx(self):
    self.request.http = HttpMockSequence([
      ({'status': '400'}, ''),
    ])

    download = MediaIoBaseDownload(
        fd=self.fd, request=self.request, chunksize=3)

    try:
      status, done = download.next_chunk()
      self.fail('Should raise an exception')
    except HttpError:
      pass

    # Even after raising an exception we can pick up where we left off.
    self.request.http = HttpMockSequence([
      ({'status': '200',
        'content-range': '0-2/5'}, b'123'),
    ])

    status, done = download.next_chunk()

    self.assertEqual(self.fd.getvalue(), b'123')

  def test_media_io_base_download_retries_connection_errors(self):
    self.request.http = HttpMockWithErrors(
        3, {'status': '200', 'content-range': '0-2/3'}, b'123')

    download = MediaIoBaseDownload(
        fd=self.fd, request=self.request, chunksize=3)
    download._sleep = lambda _x: 0  # do nothing
    download._rand = lambda: 10

    status, done = download.next_chunk(num_retries=3)

    self.assertEqual(self.fd.getvalue(), b'123')
    self.assertEqual(True, done)

  def test_media_io_base_download_retries_5xx(self):
    self.request.http = HttpMockSequence([
      ({'status': '500'}, ''),
      ({'status': '500'}, ''),
      ({'status': '500'}, ''),
      ({'status': '200',
        'content-range': '0-2/5'}, b'123'),
      ({'status': '503'}, ''),
      ({'status': '503'}, ''),
      ({'status': '503'}, ''),
      ({'status': '200',
        'content-range': '3-4/5'}, b'45'),
    ])

    download = MediaIoBaseDownload(
        fd=self.fd, request=self.request, chunksize=3)

    self.assertEqual(self.fd, download._fd)
    self.assertEqual(3, download._chunksize)
    self.assertEqual(0, download._progress)
    self.assertEqual(None, download._total_size)
    self.assertEqual(False, download._done)
    self.assertEqual(self.request.uri, download._uri)

    # Set time.sleep and random.random stubs.
    sleeptimes = []
    download._sleep = lambda x: sleeptimes.append(x)
    download._rand = lambda: 10

    status, done = download.next_chunk(num_retries=3)

    # Check for exponential backoff using the rand function above.
    self.assertEqual([20, 40, 80], sleeptimes)

    self.assertEqual(self.fd.getvalue(), b'123')
    self.assertEqual(False, done)
    self.assertEqual(3, download._progress)
    self.assertEqual(5, download._total_size)
    self.assertEqual(3, status.resumable_progress)

    # Reset time.sleep stub.
    del sleeptimes[0:len(sleeptimes)]

    status, done = download.next_chunk(num_retries=3)

    # Check for exponential backoff using the rand function above.
    self.assertEqual([20, 40, 80], sleeptimes)

    self.assertEqual(self.fd.getvalue(), b'12345')
    self.assertEqual(True, done)
    self.assertEqual(5, download._progress)
    self.assertEqual(5, download._total_size)

EXPECTED = """POST /someapi/v1/collection/?foo=bar HTTP/1.1
Content-Type: application/json
MIME-Version: 1.0
Host: www.googleapis.com
content-length: 2\r\n\r\n{}"""


NO_BODY_EXPECTED = """POST /someapi/v1/collection/?foo=bar HTTP/1.1
Content-Type: application/json
MIME-Version: 1.0
Host: www.googleapis.com
content-length: 0\r\n\r\n"""

NO_BODY_EXPECTED_GET = """GET /someapi/v1/collection/?foo=bar HTTP/1.1
Content-Type: application/json
MIME-Version: 1.0
Host: www.googleapis.com\r\n\r\n"""


RESPONSE = """HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/pony"\r\n\r\n{"answer": 42}"""


BATCH_RESPONSE = b"""--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+1>

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/pony"\r\n\r\n{"foo": 42}

--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+2>

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/sheep"\r\n\r\n{"baz": "qux"}
--batch_foobarbaz--"""


BATCH_ERROR_RESPONSE = b"""--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+1>

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/pony"\r\n\r\n{"foo": 42}

--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+2>

HTTP/1.1 403 Access Not Configured
Content-Type: application/json
Content-Length: 245
ETag: "etag/sheep"\r\n\r\n{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured",
    "debugInfo": "QuotaState: BLOCKED"
   }
  ],
  "code": 403,
  "message": "Access Not Configured"
 }
}

--batch_foobarbaz--"""


BATCH_RESPONSE_WITH_401 = b"""--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+1>

HTTP/1.1 401 Authorization Required
Content-Type: application/json
Content-Length: 14
ETag: "etag/pony"\r\n\r\n{"error": {"message":
  "Authorizaton failed."}}

--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+2>

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/sheep"\r\n\r\n{"baz": "qux"}
--batch_foobarbaz--"""


BATCH_SINGLE_RESPONSE = b"""--batch_foobarbaz
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: <randomness+1>

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 14
ETag: "etag/pony"\r\n\r\n{"foo": 42}
--batch_foobarbaz--"""


USER_RATE_LIMIT_EXCEEDED_RESPONSE = """{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "userRateLimitExceeded",
    "message": "User Rate Limit Exceeded"
   }
  ],
  "code": 403,
  "message": "User Rate Limit Exceeded"
 }
}"""


RATE_LIMIT_EXCEEDED_RESPONSE = """{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "rateLimitExceeded",
    "message": "Rate Limit Exceeded"
   }
  ],
  "code": 403,
  "message": "Rate Limit Exceeded"
 }
}"""


NOT_CONFIGURED_RESPONSE = """{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured"
   }
  ],
  "code": 403,
  "message": "Access Not Configured"
 }
}"""

class Callbacks(object):
  def __init__(self):
    self.responses = {}
    self.exceptions = {}

  def f(self, request_id, response, exception):
    self.responses[request_id] = response
    self.exceptions[request_id] = exception


class TestHttpRequest(unittest.TestCase):
  def test_unicode(self):
    http = HttpMock(datafile('zoo.json'), headers={'status': '200'})
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})
    request.execute()
    self.assertEqual(uri, http.uri)
    self.assertEqual(str, type(http.uri))
    self.assertEqual(method, http.method)
    self.assertEqual(str, type(http.method))

  def test_no_retry_connection_errors(self):
    model = JsonModel()
    request = HttpRequest(
        HttpMockWithNonRetriableErrors(1, {'status': '200'}, '{"foo": "bar"}'),
        model.response,
        u'https://www.example.com/json_api_endpoint')
    request._sleep = lambda _x: 0  # do nothing
    request._rand = lambda: 10
    with self.assertRaises(socket.error):
      response = request.execute(num_retries=3)


  def test_retry_connection_errors_non_resumable(self):
    model = JsonModel()
    request = HttpRequest(
        HttpMockWithErrors(3, {'status': '200'}, '{"foo": "bar"}'),
        model.response,
        u'https://www.example.com/json_api_endpoint')
    request._sleep = lambda _x: 0  # do nothing
    request._rand = lambda: 10
    response = request.execute(num_retries=3)
    self.assertEqual({u'foo': u'bar'}, response)

  def test_retry_connection_errors_resumable(self):
    with open(datafile('small.png'), 'rb') as small_png_file:
      small_png_fd = BytesIO(small_png_file.read())
    upload = MediaIoBaseUpload(fd=small_png_fd, mimetype='image/png',
                               chunksize=500, resumable=True)
    model = JsonModel()

    request = HttpRequest(
        HttpMockWithErrors(
            3, {'status': '200', 'location': 'location'}, '{"foo": "bar"}'),
        model.response,
        u'https://www.example.com/file_upload',
        method='POST',
        resumable=upload)
    request._sleep = lambda _x: 0  # do nothing
    request._rand = lambda: 10
    response = request.execute(num_retries=3)
    self.assertEqual({u'foo': u'bar'}, response)

  def test_retry(self):
    num_retries = 5
    resp_seq = [({'status': '500'}, '')] * (num_retries - 3)
    resp_seq.append(({'status': '403'}, RATE_LIMIT_EXCEEDED_RESPONSE))
    resp_seq.append(({'status': '403'}, USER_RATE_LIMIT_EXCEEDED_RESPONSE))
    resp_seq.append(({'status': '429'}, ''))
    resp_seq.append(({'status': '200'}, '{}'))

    http = HttpMockSequence(resp_seq)
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    sleeptimes = []
    request._sleep = lambda x: sleeptimes.append(x)
    request._rand = lambda: 10

    request.execute(num_retries=num_retries)

    self.assertEqual(num_retries, len(sleeptimes))
    for retry_num in range(num_retries):
      self.assertEqual(10 * 2**(retry_num + 1), sleeptimes[retry_num])

  def test_no_retry_succeeds(self):
    num_retries = 5
    resp_seq = [({'status': '200'}, '{}')] * (num_retries)

    http = HttpMockSequence(resp_seq)
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    sleeptimes = []
    request._sleep = lambda x: sleeptimes.append(x)
    request._rand = lambda: 10

    request.execute(num_retries=num_retries)

    self.assertEqual(0, len(sleeptimes))

  def test_no_retry_fails_fast(self):
    http = HttpMockSequence([
        ({'status': '500'}, ''),
        ({'status': '200'}, '{}')
        ])
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    request._rand = lambda: 1.0
    request._sleep = mock.MagicMock()

    with self.assertRaises(HttpError):
      request.execute()
    request._sleep.assert_not_called()

  def test_no_retry_403_not_configured_fails_fast(self):
    http = HttpMockSequence([
        ({'status': '403'}, NOT_CONFIGURED_RESPONSE),
        ({'status': '200'}, '{}')
        ])
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    request._rand = lambda: 1.0
    request._sleep =  mock.MagicMock()

    with self.assertRaises(HttpError):
      request.execute()
    request._sleep.assert_not_called()

  def test_no_retry_403_fails_fast(self):
    http = HttpMockSequence([
        ({'status': '403'}, ''),
        ({'status': '200'}, '{}')
        ])
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    request._rand = lambda: 1.0
    request._sleep =  mock.MagicMock()

    with self.assertRaises(HttpError):
      request.execute()
    request._sleep.assert_not_called()

  def test_no_retry_401_fails_fast(self):
    http = HttpMockSequence([
        ({'status': '401'}, ''),
        ({'status': '200'}, '{}')
        ])
    model = JsonModel()
    uri = u'https://www.googleapis.com/someapi/v1/collection/?foo=bar'
    method = u'POST'
    request = HttpRequest(
        http,
        model.response,
        uri,
        method=method,
        body=u'{}',
        headers={'content-type': 'application/json'})

    request._rand = lambda: 1.0
    request._sleep =  mock.MagicMock()

    with self.assertRaises(HttpError):
      request.execute()
    request._sleep.assert_not_called()

class TestBatch(unittest.TestCase):

  def setUp(self):
    model = JsonModel()
    self.request1 = HttpRequest(
        None,
        model.response,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='POST',
        body='{}',
        headers={'content-type': 'application/json'})

    self.request2 = HttpRequest(
        None,
        model.response,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='GET',
        body='',
        headers={'content-type': 'application/json'})


  def test_id_to_from_content_id_header(self):
    batch = BatchHttpRequest()
    self.assertEquals('12', batch._header_to_id(batch._id_to_header('12')))

  def test_invalid_content_id_header(self):
    batch = BatchHttpRequest()
    self.assertRaises(BatchError, batch._header_to_id, '[foo+x]')
    self.assertRaises(BatchError, batch._header_to_id, 'foo+1')
    self.assertRaises(BatchError, batch._header_to_id, '<foo>')

  def test_serialize_request(self):
    batch = BatchHttpRequest()
    request = HttpRequest(
        None,
        None,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='POST',
        body=u'{}',
        headers={'content-type': 'application/json'},
        methodId=None,
        resumable=None)
    s = batch._serialize_request(request).splitlines()
    self.assertEqual(EXPECTED.splitlines(), s)

  def test_serialize_request_media_body(self):
    batch = BatchHttpRequest()
    f = open(datafile('small.png'), 'rb')
    body = f.read()
    f.close()

    request = HttpRequest(
        None,
        None,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='POST',
        body=body,
        headers={'content-type': 'application/json'},
        methodId=None,
        resumable=None)
    # Just testing it shouldn't raise an exception.
    s = batch._serialize_request(request).splitlines()

  def test_serialize_request_no_body(self):
    batch = BatchHttpRequest()
    request = HttpRequest(
        None,
        None,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='POST',
        body=b'',
        headers={'content-type': 'application/json'},
        methodId=None,
        resumable=None)
    s = batch._serialize_request(request).splitlines()
    self.assertEqual(NO_BODY_EXPECTED.splitlines(), s)

  def test_serialize_get_request_no_body(self):
    batch = BatchHttpRequest()
    request = HttpRequest(
        None,
        None,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='GET',
        body=None,
        headers={'content-type': 'application/json'},
        methodId=None,
        resumable=None)
    s = batch._serialize_request(request).splitlines()
    self.assertEqual(NO_BODY_EXPECTED_GET.splitlines(), s)

  def test_deserialize_response(self):
    batch = BatchHttpRequest()
    resp, content = batch._deserialize_response(RESPONSE)

    self.assertEqual(200, resp.status)
    self.assertEqual('OK', resp.reason)
    self.assertEqual(11, resp.version)
    self.assertEqual('{"answer": 42}', content)

  def test_new_id(self):
    batch = BatchHttpRequest()

    id_ = batch._new_id()
    self.assertEqual('1', id_)

    id_ = batch._new_id()
    self.assertEqual('2', id_)

    batch.add(self.request1, request_id='3')

    id_ = batch._new_id()
    self.assertEqual('4', id_)

  def test_add(self):
    batch = BatchHttpRequest()
    batch.add(self.request1, request_id='1')
    self.assertRaises(KeyError, batch.add, self.request1, request_id='1')

  def test_add_fail_for_resumable(self):
    batch = BatchHttpRequest()

    upload = MediaFileUpload(
        datafile('small.png'), chunksize=500, resumable=True)
    self.request1.resumable = upload
    with self.assertRaises(BatchError) as batch_error:
      batch.add(self.request1, request_id='1')
    str(batch_error.exception)

  def test_execute_empty_batch_no_http(self):
    batch = BatchHttpRequest()
    ret = batch.execute()
    self.assertEqual(None, ret)

  def test_execute(self):
    batch = BatchHttpRequest()
    callbacks = Callbacks()

    batch.add(self.request1, callback=callbacks.f)
    batch.add(self.request2, callback=callbacks.f)
    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_RESPONSE),
      ])
    batch.execute(http=http)
    self.assertEqual({'foo': 42}, callbacks.responses['1'])
    self.assertEqual(None, callbacks.exceptions['1'])
    self.assertEqual({'baz': 'qux'}, callbacks.responses['2'])
    self.assertEqual(None, callbacks.exceptions['2'])

  def test_execute_request_body(self):
    batch = BatchHttpRequest()

    batch.add(self.request1)
    batch.add(self.request2)
    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
        'echo_request_body'),
      ])
    try:
      batch.execute(http=http)
      self.fail('Should raise exception')
    except BatchError as e:
      boundary, _ = e.content.split(None, 1)
      self.assertEqual('--', boundary[:2])
      parts = e.content.split(boundary)
      self.assertEqual(4, len(parts))
      self.assertEqual('', parts[0])
      self.assertEqual('--', parts[3].rstrip())
      header = parts[1].splitlines()[1]
      self.assertEqual('Content-Type: application/http', header)

  def test_execute_initial_refresh_oauth2(self):
    batch = BatchHttpRequest()
    callbacks = Callbacks()
    cred = MockCredentials('Foo')

    # Pretend this is a OAuth2Credentials object
    cred.access_token = None

    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_SINGLE_RESPONSE),
    ])

    cred.authorize(http)

    batch.add(self.request1, callback=callbacks.f)
    batch.execute(http=http)

    self.assertEqual({'foo': 42}, callbacks.responses['1'])
    self.assertIsNone(callbacks.exceptions['1'])

    self.assertEqual(1, cred._refreshed)

    self.assertEqual(1, cred._authorized)

    self.assertEqual(1, cred._applied)

  def test_execute_refresh_and_retry_on_401(self):
    batch = BatchHttpRequest()
    callbacks = Callbacks()
    cred_1 = MockCredentials('Foo')
    cred_2 = MockCredentials('Bar')

    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_RESPONSE_WITH_401),
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_SINGLE_RESPONSE),
      ])

    creds_http_1 = HttpMockSequence([])
    cred_1.authorize(creds_http_1)

    creds_http_2 = HttpMockSequence([])
    cred_2.authorize(creds_http_2)

    self.request1.http = creds_http_1
    self.request2.http = creds_http_2

    batch.add(self.request1, callback=callbacks.f)
    batch.add(self.request2, callback=callbacks.f)
    batch.execute(http=http)

    self.assertEqual({'foo': 42}, callbacks.responses['1'])
    self.assertEqual(None, callbacks.exceptions['1'])
    self.assertEqual({'baz': 'qux'}, callbacks.responses['2'])
    self.assertEqual(None, callbacks.exceptions['2'])

    self.assertEqual(1, cred_1._refreshed)
    self.assertEqual(0, cred_2._refreshed)

    self.assertEqual(1, cred_1._authorized)
    self.assertEqual(1, cred_2._authorized)

    self.assertEqual(1, cred_2._applied)
    self.assertEqual(2, cred_1._applied)

  def test_http_errors_passed_to_callback(self):
    batch = BatchHttpRequest()
    callbacks = Callbacks()
    cred_1 = MockCredentials('Foo')
    cred_2 = MockCredentials('Bar')

    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_RESPONSE_WITH_401),
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_RESPONSE_WITH_401),
      ])

    creds_http_1 = HttpMockSequence([])
    cred_1.authorize(creds_http_1)

    creds_http_2 = HttpMockSequence([])
    cred_2.authorize(creds_http_2)

    self.request1.http = creds_http_1
    self.request2.http = creds_http_2

    batch.add(self.request1, callback=callbacks.f)
    batch.add(self.request2, callback=callbacks.f)
    batch.execute(http=http)

    self.assertEqual(None, callbacks.responses['1'])
    self.assertEqual(401, callbacks.exceptions['1'].resp.status)
    self.assertEqual(
        'Authorization Required', callbacks.exceptions['1'].resp.reason)
    self.assertEqual({u'baz': u'qux'}, callbacks.responses['2'])
    self.assertEqual(None, callbacks.exceptions['2'])

  def test_execute_global_callback(self):
    callbacks = Callbacks()
    batch = BatchHttpRequest(callback=callbacks.f)

    batch.add(self.request1)
    batch.add(self.request2)
    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_RESPONSE),
      ])
    batch.execute(http=http)
    self.assertEqual({'foo': 42}, callbacks.responses['1'])
    self.assertEqual({'baz': 'qux'}, callbacks.responses['2'])

  def test_execute_batch_http_error(self):
    callbacks = Callbacks()
    batch = BatchHttpRequest(callback=callbacks.f)

    batch.add(self.request1)
    batch.add(self.request2)
    http = HttpMockSequence([
      ({'status': '200',
        'content-type': 'multipart/mixed; boundary="batch_foobarbaz"'},
       BATCH_ERROR_RESPONSE),
      ])
    batch.execute(http=http)
    self.assertEqual({'foo': 42}, callbacks.responses['1'])
    expected = ('<HttpError 403 when requesting '
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar returned '
        '"Access Not Configured">')
    self.assertEqual(expected, str(callbacks.exceptions['2']))


class TestRequestUriTooLong(unittest.TestCase):

  def test_turn_get_into_post(self):

    def _postproc(resp, content):
      return content

    http = HttpMockSequence([
      ({'status': '200'},
        'echo_request_body'),
      ({'status': '200'},
        'echo_request_headers'),
      ])

    # Send a long query parameter.
    query = {
        'q': 'a' * MAX_URI_LENGTH + '?&'
        }
    req = HttpRequest(
        http,
        _postproc,
        'http://example.com?' + urlencode(query),
        method='GET',
        body=None,
        headers={},
        methodId='foo',
        resumable=None)

    # Query parameters should be sent in the body.
    response = req.execute()
    self.assertEqual(b'q=' + b'a' * MAX_URI_LENGTH + b'%3F%26', response)

    # Extra headers should be set.
    response = req.execute()
    self.assertEqual('GET', response['x-http-method-override'])
    self.assertEqual(str(MAX_URI_LENGTH + 8), response['content-length'])
    self.assertEqual(
        'application/x-www-form-urlencoded', response['content-type'])


class TestStreamSlice(unittest.TestCase):
  """Test _StreamSlice."""

  def setUp(self):
    self.stream = BytesIO(b'0123456789')

  def test_read(self):
    s =  _StreamSlice(self.stream, 0, 4)
    self.assertEqual(b'', s.read(0))
    self.assertEqual(b'0', s.read(1))
    self.assertEqual(b'123', s.read())

  def test_read_too_much(self):
    s =  _StreamSlice(self.stream, 1, 4)
    self.assertEqual(b'1234', s.read(6))

  def test_read_all(self):
    s =  _StreamSlice(self.stream, 2, 1)
    self.assertEqual(b'2', s.read(-1))


class TestResponseCallback(unittest.TestCase):
  """Test adding callbacks to responses."""

  def test_ensure_response_callback(self):
    m = JsonModel()
    request = HttpRequest(
        None,
        m.response,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='POST',
        body='{}',
        headers={'content-type': 'application/json'})
    h = HttpMockSequence([ ({'status': 200}, '{}')])
    responses = []
    def _on_response(resp, responses=responses):
      responses.append(resp)
    request.add_response_callback(_on_response)
    request.execute(http=h)
    self.assertEqual(1, len(responses))


class TestHttpMock(unittest.TestCase):
  def test_default_response_headers(self):
    http = HttpMock(datafile('zoo.json'))
    resp, content = http.request("http://example.com")
    self.assertEqual(resp.status, 200)

  def test_error_response(self):
    http = HttpMock(datafile('bad_request.json'), {'status': '400'})
    model = JsonModel()
    request = HttpRequest(
        http,
        model.response,
        'https://www.googleapis.com/someapi/v1/collection/?foo=bar',
        method='GET',
        headers={})
    self.assertRaises(HttpError, request.execute)


if __name__ == '__main__':
  logging.getLogger().setLevel(logging.ERROR)
  unittest.main()