Extend direct_client

Rework header handling and add some methods needed by the reconciler.

 * response headers are case insensitive HeaderKeyDicts
 * add direct client container obj put and delete
 * add headers param to direct head object
 * add headers to DirectClientException

DirectClientException is a subclass of ClientException with a convience
constructor.  ClientException now supports an http_headers kwarg.

Exceptions raised from direct_client will include headers.

DocImpact
Implements: blueprint storage-policies
Change-Id: Ia484d569619df0bf85f973e4e916de2ac6401d5e

swift/common/direct_client.py

@@ -39,6 +39,19 @@ except ImportError:
     import json
 
 
+class DirectClientException(ClientException):
+
+    def __init__(self, stype, method, node, part, path, resp):
+        full_path = quote('/%s/%s%s' % (node['device'], part, path))
+        msg = '%s server %s:%s direct %s %r gave status %s' % (
+            stype, node['ip'], node['port'], method, full_path, resp.status)
+        headers = HeaderKeyDict(resp.getheaders())
+        super(DirectClientException, self).__init__(
+            msg, http_host=node['ip'], http_port=node['port'],
+            http_device=node['device'], http_status=resp.status,
+            http_reason=resp.reason, http_headers=headers)
+
+
 def _get_direct_account_container(path, stype, node, part,
                                   account, marker=None, limit=None,
                                   prefix=None, delimiter=None, conn_timeout=5,
@@ -65,17 +78,10 @@ def _get_direct_account_container(path, stype, node, part,
         resp = conn.getresponse()
     if not is_success(resp.status):
         resp.read()
-        raise ClientException(
+        raise DirectClientException(stype, 'GET', node, part, path, resp)
-            '%s server %s:%s direct GET %s gave stats %s' %
+    resp_headers = HeaderKeyDict()
-            (stype, node['ip'], node['port'],
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
-    resp_headers = {}
     for header, value in resp.getheaders():
-        resp_headers[header.lower()] = value
+        resp_headers[header] = value
     if resp.status == HTTP_NO_CONTENT:
         resp.read()
         return resp_headers, []
@@ -106,7 +112,7 @@ def direct_get_account(node, part, account, marker=None, limit=None,
     :param conn_timeout: timeout in seconds for establishing the connection
     :param response_timeout: timeout in seconds for getting the response
     :returns: a tuple of (response headers, a list of containers) The response
-              headers will be a dict and all header names will be lowercase.
+              headers will HeaderKeyDict.
     """
     path = '/' + account
     return _get_direct_account_container(path, "Account", node, part,
@@ -117,6 +123,24 @@ def direct_get_account(node, part, account, marker=None, limit=None,
                                          response_timeout=15)
 
 
+def direct_delete_account(node, part, account, conn_timeout=5,
+                          response_timeout=15, headers=None):
+    if headers is None:
+        headers = {}
+
+    path = '/%s' % account
+    with Timeout(conn_timeout):
+        conn = http_connect(node['ip'], node['port'], node['device'], part,
+                            'DELETE', path,
+                            headers=gen_headers(headers, True))
+    with Timeout(response_timeout):
+        resp = conn.getresponse()
+        resp.read()
+    if not is_success(resp.status):
+        raise DirectClientException('Account', 'DELETE',
+                                    node, part, path, resp)
+
+
 def direct_head_container(node, part, account, container, conn_timeout=5,
                           response_timeout=15):
     """
@@ -128,8 +152,7 @@ def direct_head_container(node, part, account, container, conn_timeout=5,
     :param container: container name
     :param conn_timeout: timeout in seconds for establishing the connection
     :param response_timeout: timeout in seconds for getting the response
-    :returns: a dict containing the response's headers (all header names will
+    :returns: a dict containing the response's headers in a HeaderKeyDict
-              be lowercase)
     """
     path = '/%s/%s' % (account, container)
     with Timeout(conn_timeout):
@@ -139,17 +162,11 @@ def direct_head_container(node, part, account, container, conn_timeout=5,
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Container', 'HEAD',
-            'Container server %s:%s direct HEAD %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
+    resp_headers = HeaderKeyDict()
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
-    resp_headers = {}
     for header, value in resp.getheaders():
-        resp_headers[header.lower()] = value
+        resp_headers[header] = value
     return resp_headers
 
 
@@ -170,7 +187,7 @@ def direct_get_container(node, part, account, container, marker=None,
     :param conn_timeout: timeout in seconds for establishing the connection
     :param response_timeout: timeout in seconds for getting the response
     :returns: a tuple of (response headers, a list of objects) The response
-              headers will be a dict and all header names will be lowercase.
+              headers will be a HeaderKeyDict.
     """
     path = '/%s/%s' % (account, container)
     return _get_direct_account_container(path, "Container", node,
@@ -195,17 +212,56 @@ def direct_delete_container(node, part, account, container, conn_timeout=5,
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Container', 'DELETE',
-            'Container server %s:%s direct DELETE %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
+
-             repr('/%s/%s%s' % (node['device'], part, path)), resp.status),
+
-            http_host=node['ip'], http_port=node['port'],
+def direct_put_container_object(node, part, account, container, obj,
-            http_device=node['device'], http_status=resp.status,
+                                conn_timeout=5, response_timeout=15,
-            http_reason=resp.reason)
+                                headers=None):
+    if headers is None:
+        headers = {}
+
+    have_x_timestamp = 'x-timestamp' in (k.lower() for k in headers)
+
+    path = '/%s/%s/%s' % (account, container, obj)
+    with Timeout(conn_timeout):
+        conn = http_connect(node['ip'], node['port'], node['device'], part,
+                            'PUT', path,
+                            headers=gen_headers(headers,
+                                                add_ts=(not have_x_timestamp)))
+    with Timeout(response_timeout):
+        resp = conn.getresponse()
+        resp.read()
+    if not is_success(resp.status):
+        raise DirectClientException('Container', 'PUT',
+                                    node, part, path, resp)
+
+
+def direct_delete_container_object(node, part, account, container, obj,
+                                   conn_timeout=5, response_timeout=15,
+                                   headers=None):
+    if headers is None:
+        headers = {}
+
+    headers = gen_headers(headers, add_ts='x-timestamp' not in (
+        k.lower() for k in headers))
+
+    path = '/%s/%s/%s' % (account, container, obj)
+    with Timeout(conn_timeout):
+        conn = http_connect(node['ip'], node['port'], node['device'], part,
+                            'DELETE', path, headers=headers)
+
+    with Timeout(response_timeout):
+        resp = conn.getresponse()
+        resp.read()
+    if not is_success(resp.status):
+        raise DirectClientException('Container', 'DELETE',
+                                    node, part, path, resp)
 
 
 def direct_head_object(node, part, account, container, obj, conn_timeout=5,
-                       response_timeout=15):
+                       response_timeout=15, headers=None):
     """
     Request object information directly from the object server.
 
@@ -216,28 +272,27 @@ def direct_head_object(node, part, account, container, obj, conn_timeout=5,
     :param obj: object name
     :param conn_timeout: timeout in seconds for establishing the connection
     :param response_timeout: timeout in seconds for getting the response
-    :returns: a dict containing the response's headers (all header names will
+    :param headers: dict to be passed into HTTPConnection headers
-              be lowercase)
+    :returns: a dict containing the response's headers in a HeaderKeyDict
     """
+    if headers is None:
+        headers = {}
+
+    headers = gen_headers(headers)
+
     path = '/%s/%s/%s' % (account, container, obj)
     with Timeout(conn_timeout):
         conn = http_connect(node['ip'], node['port'], node['device'], part,
-                            'HEAD', path, headers=gen_headers())
+                            'HEAD', path, headers=headers)
     with Timeout(response_timeout):
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Object', 'HEAD',
-            'Object server %s:%s direct HEAD %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
+    resp_headers = HeaderKeyDict()
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
-    resp_headers = {}
     for header, value in resp.getheaders():
-        resp_headers[header.lower()] = value
+        resp_headers[header] = value
     return resp_headers
 
 
@@ -256,7 +311,7 @@ def direct_get_object(node, part, account, container, obj, conn_timeout=5,
     :param resp_chunk_size: if defined, chunk size of data to read.
     :param headers: dict to be passed into HTTPConnection headers
     :returns: a tuple of (response headers, the object's contents) The response
-              headers will be a dict and all header names will be lowercase.
+              headers will be a HeaderKeyDict.
     """
     if headers is None:
         headers = {}
@@ -269,13 +324,8 @@ def direct_get_object(node, part, account, container, obj, conn_timeout=5,
         resp = conn.getresponse()
     if not is_success(resp.status):
         resp.read()
-        raise ClientException(
+        raise DirectClientException('Object', 'GET',
-            'Object server %s:%s direct GET %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
-             repr('/%s/%s%s' % (node['device'], part, path)), resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
     if resp_chunk_size:
 
         def _object_body():
@@ -286,9 +336,9 @@ def direct_get_object(node, part, account, container, obj, conn_timeout=5,
         object_body = _object_body()
     else:
         object_body = resp.read()
-    resp_headers = {}
+    resp_headers = HeaderKeyDict()
     for header, value in resp.getheaders():
-        resp_headers[header.lower()] = value
+        resp_headers[header] = value
     return resp_headers, object_body
 
 
@@ -368,14 +418,8 @@ def direct_put_object(node, part, account, container, name, contents,
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Object', 'PUT',
-            'Object server %s:%s direct PUT %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
     return resp.getheader('etag').strip('"')
 
 
@@ -402,14 +446,8 @@ def direct_post_object(node, part, account, container, name, headers,
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Object', 'POST',
-            'Object server %s:%s direct POST %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
 
 
 def direct_delete_object(node, part, account, container, obj,
@@ -429,22 +467,19 @@ def direct_delete_object(node, part, account, container, obj,
     if headers is None:
         headers = {}
 
+    headers = gen_headers(headers, add_ts='x-timestamp' not in (
+        k.lower() for k in headers))
+
     path = '/%s/%s/%s' % (account, container, obj)
     with Timeout(conn_timeout):
         conn = http_connect(node['ip'], node['port'], node['device'], part,
-                            'DELETE', path, headers=gen_headers(headers, True))
+                            'DELETE', path, headers=headers)
     with Timeout(response_timeout):
         resp = conn.getresponse()
         resp.read()
     if not is_success(resp.status):
-        raise ClientException(
+        raise DirectClientException('Object', 'DELETE',
-            'Object server %s:%s direct DELETE %s gave status %s' %
+                                    node, part, path, resp)
-            (node['ip'], node['port'],
-             repr('/%s/%s%s' % (node['device'], part, path)),
-             resp.status),
-            http_host=node['ip'], http_port=node['port'],
-            http_device=node['device'], http_status=resp.status,
-            http_reason=resp.reason)
 
 
 def retry(func, *args, **kwargs):

swift/common/exceptions.py

@@ -139,7 +139,7 @@ class ClientException(Exception):
 
     def __init__(self, msg, http_scheme='', http_host='', http_port='',
                  http_path='', http_query='', http_status=0, http_reason='',
-                 http_device='', http_response_content=''):
+                 http_device='', http_response_content='', http_headers=None):
         Exception.__init__(self, msg)
         self.msg = msg
         self.http_scheme = http_scheme
@@ -151,6 +151,7 @@ class ClientException(Exception):
         self.http_reason = http_reason
         self.http_device = http_device
         self.http_response_content = http_response_content
+        self.http_headers = http_headers or {}
 
     def __str__(self):
         a = self.msg

test/unit/common/test_direct_client.py

@@ -15,325 +15,578 @@
 
 import unittest
 import os
-
+import urllib
+from contextlib import contextmanager
 import StringIO
 from hashlib import md5
+import time
+
+import mock
 
 from swift.common import direct_client
 from swift.common.exceptions import ClientException
-from swift.common.utils import json
+from swift.common.utils import json, normalize_timestamp
+from swift.common.swob import HeaderKeyDict, RESPONSE_REASONS
+from swift.common.storage_policy import POLICY_INDEX, POLICIES
+
+from test.unit import patch_policies
 
 
-def mock_http_connect(status, fake_headers=None, body=None):
+class FakeConn(object):
 
-    class FakeConn(object):
+    def __init__(self, status, headers=None, body='', **kwargs):
-
-        def __init__(self, status, fake_headers, body, *args, **kwargs):
         self.status = status
+        try:
+            self.reason = RESPONSE_REASONS[self.status][0]
+        except Exception:
             self.reason = 'Fake'
         self.body = body
-            self.host = args[0]
+        self.resp_headers = HeaderKeyDict()
-            self.port = args[1]
+        if headers:
-            self.method = args[4]
+            self.resp_headers.update(headers)
-            self.path = args[5]
         self.with_exc = False
-            self.headers = kwargs.get('headers', {})
+        self.etag = None
-            self.fake_headers = fake_headers
+
-            self.etag = md5()
+    def _update_raw_call_args(self, *args, **kwargs):
+        capture_attrs = ('host', 'port', 'method', 'path', 'req_headers',
+                         'query_string')
+        for attr, value in zip(capture_attrs, args[:len(capture_attrs)]):
+            setattr(self, attr, value)
+        return self
 
     def getresponse(self):
+        if self.etag:
+            self.resp_headers['etag'] = str(self.etag.hexdigest())
         if self.with_exc:
             raise Exception('test')
-
-            if self.fake_headers is not None and self.method == 'POST':
-                self.fake_headers.append(self.headers)
         return self
 
     def getheader(self, header, default=None):
-            return self.headers.get(header.lower(), default)
+        return self.resp_headers.get(header, default)
 
     def getheaders(self):
-            if self.fake_headers is not None:
+        return self.resp_headers.items()
-                for key in self.fake_headers:
-                    self.headers.update({key: self.fake_headers[key]})
-            return self.headers.items()
 
     def read(self):
         return self.body
 
     def send(self, data):
+        if not self.etag:
+            self.etag = md5()
         self.etag.update(data)
-            self.headers['etag'] = str(self.etag.hexdigest())
-
-        def close(self):
-            return
-    return lambda *args, **kwargs: FakeConn(status, fake_headers, body,
-                                            *args, **kwargs)
 
 
+@contextmanager
+def mocked_http_conn(*args, **kwargs):
+    fake_conn = FakeConn(*args, **kwargs)
+    mock_http_conn = lambda *args, **kwargs: \
+        fake_conn._update_raw_call_args(*args, **kwargs)
+    with mock.patch('swift.common.bufferedhttp.http_connect_raw',
+                    new=mock_http_conn):
+        yield fake_conn
+
+
+@patch_policies
 class TestDirectClient(unittest.TestCase):
 
+    def setUp(self):
+        self.node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        self.part = '0'
+
+        self.account = u'\u062a account'
+        self.container = u'\u062a container'
+        self.obj = u'\u062a obj/name'
+        self.account_path = '/sda/0/%s' % urllib.quote(
+            self.account.encode('utf-8'))
+        self.container_path = '/sda/0/%s/%s' % tuple(
+            urllib.quote(p.encode('utf-8')) for p in (
+                self.account, self.container))
+        self.obj_path = '/sda/0/%s/%s/%s' % tuple(
+            urllib.quote(p.encode('utf-8')) for p in (
+                self.account, self.container, self.obj))
+        self.user_agent = 'direct-client %s' % os.getpid()
+
     def test_gen_headers(self):
-        hdrs = direct_client.gen_headers()
+        stub_user_agent = 'direct-client %s' % os.getpid()
-        assert 'user-agent' in hdrs
-        assert hdrs['user-agent'] == 'direct-client %s' % os.getpid()
-        assert len(hdrs.keys()) == 1
 
-        hdrs = direct_client.gen_headers(add_ts=True)
+        headers = direct_client.gen_headers()
-        assert 'user-agent' in hdrs
+        self.assertEqual(headers['user-agent'], stub_user_agent)
-        assert 'x-timestamp' in hdrs
+        self.assertEqual(1, len(headers))
-        assert len(hdrs.keys()) == 2
 
-        hdrs = direct_client.gen_headers(hdrs_in={'foo-bar': '47'})
+        now = time.time()
-        assert 'user-agent' in hdrs
+        headers = direct_client.gen_headers(add_ts=True)
-        assert 'foo-bar' in hdrs
+        self.assertEqual(headers['user-agent'], stub_user_agent)
-        assert hdrs['foo-bar'] == '47'
+        self.assert_(now - 1 < float(headers['x-timestamp']) < now + 1)
-        assert len(hdrs.keys()) == 2
+        self.assertEqual(headers['x-timestamp'],
+                         normalize_timestamp(float(headers['x-timestamp'])))
+        self.assertEqual(2, len(headers))
 
-        hdrs = direct_client.gen_headers(hdrs_in={'user-agent': '47'})
+        headers = direct_client.gen_headers(hdrs_in={'foo-bar': '47'})
-        assert 'user-agent' in hdrs
+        self.assertEqual(headers['user-agent'], stub_user_agent)
-        assert hdrs['user-agent'] == 'direct-client %s' % os.getpid()
+        self.assertEqual(headers['foo-bar'], '47')
-        assert len(hdrs.keys()) == 1
+        self.assertEqual(2, len(headers))
+
+        headers = direct_client.gen_headers(hdrs_in={'user-agent': '47'})
+        self.assertEqual(headers['user-agent'], stub_user_agent)
+        self.assertEqual(1, len(headers))
+
+        for policy in POLICIES:
+            for add_ts in (True, False):
+                now = time.time()
+                headers = direct_client.gen_headers(
+                    {POLICY_INDEX: policy.idx}, add_ts=add_ts)
+                self.assertEqual(headers['user-agent'], stub_user_agent)
+                self.assertEqual(headers[POLICY_INDEX], str(policy.idx))
+                expected_header_count = 2
+                if add_ts:
+                    expected_header_count += 1
+                    self.assertEqual(
+                        headers['x-timestamp'],
+                        normalize_timestamp(float(headers['x-timestamp'])))
+                    self.assert_(
+                        now - 1 < float(headers['x-timestamp']) < now + 1)
+                self.assertEqual(expected_header_count, len(headers))
 
     def test_direct_get_account(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        stub_headers = HeaderKeyDict({
-        part = '0'
+            'X-Account-Container-Count': '1',
-        account = 'a'
+            'X-Account-Object-Count': '1',
+            'X-Account-Bytes-Used': '1',
+            'X-Timestamp': '1234567890',
+            'X-PUT-Timestamp': '1234567890'})
+
+        body = '[{"count": 1, "bytes": 20971520, "name": "c1"}]'
+
+        with mocked_http_conn(200, stub_headers, body) as conn:
+            resp_headers, resp = direct_client.direct_get_account(
+                self.node, self.part, self.account)
+            self.assertEqual(conn.method, 'GET')
+            self.assertEqual(conn.path, self.account_path)
+
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
+        self.assertEqual(resp_headers, stub_headers)
+        self.assertEqual(json.loads(body), resp)
+
+    def test_direct_client_exception(self):
+        stub_headers = {'X-Trans-Id': 'txb5f59485c578460f8be9e-0053478d09'}
+        body = 'a server error has occurred'
+        with mocked_http_conn(500, stub_headers, body):
+            try:
+                direct_client.direct_get_account(self.node, self.part,
+                                                 self.account)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+        self.assertEqual(err.http_status, 500)
+        expected_err_msg_parts = (
+            'Account server %s:%s' % (self.node['ip'], self.node['port']),
+            'GET %r' % self.account_path,
+            'status 500',
+        )
+        for item in expected_err_msg_parts:
+            self.assert_(item in str(err), '%r was not in "%s"' % (item, err))
+        self.assertEqual(err.http_host, self.node['ip'])
+        self.assertEqual(err.http_port, self.node['port'])
+        self.assertEqual(err.http_device, self.node['device'])
+        self.assertEqual(err.http_status, 500)
+        self.assertEqual(err.http_reason, 'Internal Error')
+        self.assertEqual(err.http_headers, stub_headers)
+
+    def test_direct_get_account_no_content_does_not_parse_body(self):
         headers = {
             'X-Account-Container-Count': '1',
             'X-Account-Object-Count': '1',
             'X-Account-Bytes-Used': '1',
             'X-Timestamp': '1234567890',
             'X-PUT-Timestamp': '1234567890'}
+        with mocked_http_conn(204, headers) as conn:
+            resp_headers, resp = direct_client.direct_get_account(
+                self.node, self.part, self.account)
+            self.assertEqual(conn.method, 'GET')
+            self.assertEqual(conn.path, self.account_path)
 
-        body = '[{"count": 1, "bytes": 20971520, "name": "c1"}]'
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
-
+        self.assertEqual(resp_headers, resp_headers)
-        fake_headers = {}
-        for header, value in headers.items():
-            fake_headers[header.lower()] = value
-
-        was_http_connector = direct_client.http_connect
-        direct_client.http_connect = mock_http_connect(200, fake_headers, body)
-
-        resp_headers, resp = direct_client.direct_get_account(node, part,
-                                                              account)
-
-        fake_headers.update({'user-agent': 'direct-client %s' % os.getpid()})
-        self.assertEqual(fake_headers, resp_headers)
-        self.assertEqual(json.loads(body), resp)
-
-        direct_client.http_connect = mock_http_connect(204, fake_headers, body)
-
-        resp_headers, resp = direct_client.direct_get_account(node, part,
-                                                              account)
-
-        fake_headers.update({'user-agent': 'direct-client %s' % os.getpid()})
-        self.assertEqual(fake_headers, resp_headers)
         self.assertEqual([], resp)
 
-        direct_client.http_connect = was_http_connector
+    def test_direct_get_account_error(self):
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_get_account(
+                    self.node, self.part, self.account)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'GET')
+            self.assertEqual(conn.path, self.account_path)
+        self.assertEqual(err.http_status, 500)
+        self.assert_('GET' in str(err))
+
+    def test_direct_delete_account(self):
+        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        part = '0'
+        account = 'a'
+
+        mock_path = 'swift.common.bufferedhttp.http_connect_raw'
+        with mock.patch(mock_path) as fake_connect:
+            fake_connect.return_value.getresponse.return_value.status = 200
+            direct_client.direct_delete_account(node, part, account)
+            args, kwargs = fake_connect.call_args
+            method = args[2]
+            self.assertEqual('DELETE', method)
+            path = args[3]
+            self.assertEqual('/sda/0/a', path)
+            headers = args[4]
+            self.assert_('X-Timestamp' in headers)
 
     def test_direct_head_container(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        headers = HeaderKeyDict(key='value')
-        part = '0'
-        account = 'a'
-        container = 'c'
-        headers = {'key': 'value'}
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, headers) as conn:
-        direct_client.http_connect = mock_http_connect(200, headers)
+            resp = direct_client.direct_head_container(
+                self.node, self.part, self.account, self.container)
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.container_path)
 
-        resp = direct_client.direct_head_container(node, part, account,
+        self.assertEqual(conn.req_headers['user-agent'],
-                                                   container)
+                         self.user_agent)
-
-        headers.update({'user-agent': 'direct-client %s' % os.getpid()})
         self.assertEqual(headers, resp)
 
-        direct_client.http_connect = was_http_connector
+    def test_direct_head_container_error(self):
+        headers = HeaderKeyDict(key='value')
+
+        with mocked_http_conn(503, headers) as conn:
+            try:
+                direct_client.direct_head_container(
+                    self.node, self.part, self.account, self.container)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            # check request
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.container_path)
+
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
+        self.assertEqual(err.http_status, 503)
+        self.assertEqual(err.http_headers, headers)
+        self.assert_('HEAD' in str(err))
+
+    def test_direct_head_container_deleted(self):
+        important_timestamp = normalize_timestamp(time.time())
+        headers = HeaderKeyDict({'X-Backend-Important-Timestamp':
+                                 important_timestamp})
+
+        with mocked_http_conn(404, headers) as conn:
+            try:
+                direct_client.direct_head_container(
+                    self.node, self.part, self.account, self.container)
+            except Exception as err:
+                self.assert_(isinstance(err, ClientException))
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.container_path)
+
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
+        self.assertEqual(err.http_status, 404)
+        self.assertEqual(err.http_headers, headers)
 
     def test_direct_get_container(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        headers = HeaderKeyDict({'key': 'value'})
-        part = '0'
-        account = 'a'
-        container = 'c'
-        headers = {'key': 'value'}
         body = '[{"hash": "8f4e3", "last_modified": "317260", "bytes": 209}]'
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, headers, body) as conn:
-        direct_client.http_connect = mock_http_connect(200, headers, body)
+            resp_headers, resp = direct_client.direct_get_container(
+                self.node, self.part, self.account, self.container)
 
-        resp_headers, resp = (
+        self.assertEqual(conn.req_headers['user-agent'],
-            direct_client.direct_get_container(node, part, account, container))
+                         'direct-client %s' % os.getpid())
-
-        headers.update({'user-agent': 'direct-client %s' % os.getpid()})
         self.assertEqual(headers, resp_headers)
         self.assertEqual(json.loads(body), resp)
 
-        direct_client.http_connect = mock_http_connect(204, headers, body)
+    def test_direct_get_container_no_content_does_not_decode_body(self):
+        headers = {}
+        body = ''
+        with mocked_http_conn(204, headers, body) as conn:
+            resp_headers, resp = direct_client.direct_get_container(
+                self.node, self.part, self.account, self.container)
 
-        resp_headers, resp = (
+        self.assertEqual(conn.req_headers['user-agent'],
-            direct_client.direct_get_container(node, part, account, container))
+                         'direct-client %s' % os.getpid())
-
-        headers.update({'user-agent': 'direct-client %s' % os.getpid()})
         self.assertEqual(headers, resp_headers)
         self.assertEqual([], resp)
 
-        direct_client.http_connect = was_http_connector
-
     def test_direct_delete_container(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        with mocked_http_conn(200) as conn:
-        part = '0'
+            direct_client.direct_delete_container(
-        account = 'a'
+                self.node, self.part, self.account, self.container)
-        container = 'c'
+            self.assertEqual(conn.method, 'DELETE')
+            self.assertEqual(conn.path, self.container_path)
 
-        was_http_connector = direct_client.http_connect
+    def test_direct_delete_container_error(self):
-        direct_client.http_connect = mock_http_connect(200)
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_delete_container(
+                    self.node, self.part, self.account, self.container)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
 
-        direct_client.direct_delete_container(node, part, account, container)
+            self.assertEqual(conn.method, 'DELETE')
+            self.assertEqual(conn.path, self.container_path)
 
-        direct_client.http_connect = was_http_connector
+        self.assertEqual(err.http_status, 500)
+        self.assert_('DELETE' in str(err))
+
+    def test_direct_put_container_object(self):
+        headers = {'x-foo': 'bar'}
+
+        with mocked_http_conn(204) as conn:
+            rv = direct_client.direct_put_container_object(
+                self.node, self.part, self.account, self.container, self.obj,
+                headers=headers)
+            self.assertEqual(conn.method, 'PUT')
+            self.assertEqual(conn.path, self.obj_path)
+            self.assert_('x-timestamp' in conn.req_headers)
+            self.assertEqual('bar', conn.req_headers.get('x-foo'))
+
+        self.assertEqual(rv, None)
+
+    def test_direct_put_container_object_error(self):
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_put_container_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+
+            self.assertEqual(conn.method, 'PUT')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(err.http_status, 500)
+        self.assert_('PUT' in str(err))
+
+    def test_direct_delete_container_object(self):
+        with mocked_http_conn(204) as conn:
+            rv = direct_client.direct_delete_container_object(
+                self.node, self.part, self.account, self.container, self.obj)
+            self.assertEqual(conn.method, 'DELETE')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(rv, None)
+
+    def test_direct_delete_container_obj_error(self):
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_delete_container_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+
+            self.assertEqual(conn.method, 'DELETE')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(err.http_status, 500)
+        self.assert_('DELETE' in str(err))
 
     def test_direct_head_object(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        headers = HeaderKeyDict({'x-foo': 'bar'})
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
-        headers = {'key': 'value'}
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, headers) as conn:
-        direct_client.http_connect = mock_http_connect(200, headers)
+            resp = direct_client.direct_head_object(
+                self.node, self.part, self.account, self.container,
+                self.obj, headers=headers)
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.obj_path)
 
-        resp = direct_client.direct_head_object(node, part, account,
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
-                                                container, name)
+        self.assertEqual('bar', conn.req_headers.get('x-foo'))
-        headers.update({'user-agent': 'direct-client %s' % os.getpid()})
+        self.assert_('x-timestamp' not in conn.req_headers,
+                     'x-timestamp was in HEAD request headers')
         self.assertEqual(headers, resp)
 
-        direct_client.http_connect = was_http_connector
+    def test_direct_head_object_error(self):
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_head_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(err.http_status, 500)
+        self.assert_('HEAD' in str(err))
+
+    def test_direct_head_object_not_found(self):
+        important_timestamp = normalize_timestamp(time.time())
+        stub_headers = {'X-Backend-Important-Timestamp': important_timestamp}
+        with mocked_http_conn(404, headers=stub_headers) as conn:
+            try:
+                direct_client.direct_head_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'HEAD')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(err.http_status, 404)
+        self.assertEqual(err.http_headers['x-backend-important-timestamp'],
+                         important_timestamp)
 
     def test_direct_get_object(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
         contents = StringIO.StringIO('123456')
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, body=contents) as conn:
-        direct_client.http_connect = mock_http_connect(200, body=contents)
+            resp_header, obj_body = direct_client.direct_get_object(
-
+                self.node, self.part, self.account, self.container, self.obj)
-        resp_header, obj_body = (
+            self.assertEqual(conn.method, 'GET')
-            direct_client.direct_get_object(node, part, account, container,
+            self.assertEqual(conn.path, self.obj_path)
-                                            name))
         self.assertEqual(obj_body, contents)
 
-        direct_client.http_connect = was_http_connector
+    def test_direct_get_object_error(self):
-
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_get_object(
+                    self.node, self.part,
+                    self.account, self.container, self.obj)
+            except ClientException as err:
                 pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'GET')
+            self.assertEqual(conn.path, self.obj_path)
+
+        self.assertEqual(err.http_status, 500)
+        self.assert_('GET' in str(err))
 
     def test_direct_post_object(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
         headers = {'Key': 'value'}
 
-        fake_headers = []
+        resp_headers = []
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, resp_headers) as conn:
-        direct_client.http_connect = mock_http_connect(200, fake_headers)
+            direct_client.direct_post_object(
+                self.node, self.part, self.account, self.container, self.obj,
+                headers)
+            self.assertEqual(conn.method, 'POST')
+            self.assertEqual(conn.path, self.obj_path)
 
-        direct_client.direct_post_object(node, part, account,
+        for header in headers:
-                                         container, name, headers)
+            self.assertEqual(conn.req_headers[header], headers[header])
-        self.assertEqual(headers['Key'], fake_headers[0].get('Key'))
 
-        direct_client.http_connect = was_http_connector
+    def test_direct_post_object_error(self):
+        headers = {'Key': 'value'}
+
+        with mocked_http_conn(500) as conn:
+            try:
+                direct_client.direct_post_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj, headers)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'POST')
+            self.assertEqual(conn.path, self.obj_path)
+            for header in headers:
+                self.assertEqual(conn.req_headers[header], headers[header])
+            self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
+            self.assert_('x-timestamp' in conn.req_headers)
+
+        self.assertEqual(err.http_status, 500)
+        self.assert_('POST' in str(err))
 
     def test_direct_delete_object(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        with mocked_http_conn(200) as conn:
-        part = '0'
+            resp = direct_client.direct_delete_object(
-        account = 'a'
+                self.node, self.part, self.account, self.container, self.obj)
-        container = 'c'
+            self.assertEqual(conn.method, 'DELETE')
-        name = 'o'
+            self.assertEqual(conn.path, self.obj_path)
+        self.assertEqual(resp, None)
 
-        was_http_connector = direct_client.http_connect
+    def test_direct_delete_object_error(self):
-        direct_client.http_connect = mock_http_connect(200)
+        with mocked_http_conn(503) as conn:
+            try:
+                direct_client.direct_delete_object(
+                    self.node, self.part, self.account, self.container,
+                    self.obj)
+            except ClientException as err:
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'DELETE')
+            self.assertEqual(conn.path, self.obj_path)
+        self.assertEqual(err.http_status, 503)
+        self.assert_('DELETE' in str(err))
 
-        direct_client.direct_delete_object(node, part, account, container,
+    def test_direct_put_object_with_content_length(self):
-                                           name)
-
-        direct_client.http_connect = was_http_connector
-
-    def test_direct_put_object(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
         contents = StringIO.StringIO('123456')
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200) as conn:
-        direct_client.http_connect = mock_http_connect(200)
+            resp = direct_client.direct_put_object(
-
+                self.node, self.part, self.account, self.container, self.obj,
-        resp = direct_client.direct_put_object(node, part, account,
+                contents, 6)
-                                               container, name, contents, 6)
+            self.assertEqual(conn.method, 'PUT')
+            self.assertEqual(conn.path, self.obj_path)
         self.assertEqual(md5('123456').hexdigest(), resp)
 
-        direct_client.http_connect = was_http_connector
-
     def test_direct_put_object_fail(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
         contents = StringIO.StringIO('123456')
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(500) as conn:
-        direct_client.http_connect = mock_http_connect(500)
+            try:
-
+                direct_client.direct_put_object(
-        self.assertRaises(ClientException, direct_client.direct_put_object,
+                    self.node, self.part, self.account, self.container,
-                          node, part, account, container, name, contents)
+                    self.obj, contents)
-
+            except ClientException as err:
-        direct_client.http_connect = was_http_connector
+                pass
+            else:
+                self.fail('ClientException not raised')
+            self.assertEqual(conn.method, 'PUT')
+            self.assertEqual(conn.path, self.obj_path)
+        self.assertEqual(err.http_status, 500)
 
     def test_direct_put_object_chunked(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
         contents = StringIO.StringIO('123456')
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200) as conn:
-        direct_client.http_connect = mock_http_connect(200)
+            resp = direct_client.direct_put_object(
-
+                self.node, self.part, self.account, self.container, self.obj,
-        resp = direct_client.direct_put_object(node, part, account,
+                contents)
-                                               container, name, contents)
+            self.assertEqual(conn.method, 'PUT')
+            self.assertEqual(conn.path, self.obj_path)
         self.assertEqual(md5('6\r\n123456\r\n0\r\n\r\n').hexdigest(), resp)
 
-        direct_client.http_connect = was_http_connector
-
     def test_retry(self):
-        node = {'ip': '1.2.3.4', 'port': '6000', 'device': 'sda'}
+        headers = HeaderKeyDict({'key': 'value'})
-        part = '0'
-        account = 'a'
-        container = 'c'
-        name = 'o'
-        headers = {'key': 'value'}
 
-        was_http_connector = direct_client.http_connect
+        with mocked_http_conn(200, headers) as conn:
-        direct_client.http_connect = mock_http_connect(200, headers)
+            attempts, resp = direct_client.retry(
-
+                direct_client.direct_head_object, self.node, self.part,
-        attempts, resp = direct_client.retry(direct_client.direct_head_object,
+                self.account, self.container, self.obj)
-                                             node, part, account, container,
+            self.assertEqual(conn.method, 'HEAD')
-                                             name)
+            self.assertEqual(conn.path, self.obj_path)
-        headers.update({'user-agent': 'direct-client %s' % os.getpid()})
+        self.assertEqual(conn.req_headers['user-agent'], self.user_agent)
         self.assertEqual(headers, resp)
         self.assertEqual(attempts, 1)
 
-        direct_client.http_connect = was_http_connector
 
 if __name__ == '__main__':
     unittest.main()