diff --git a/lib/ansible/module_utils/hwc_utils.py b/lib/ansible/module_utils/hwc_utils.py
index 59850b6bc4..177f8de943 100644
--- a/lib/ansible/module_utils/hwc_utils.py
+++ b/lib/ansible/module_utils/hwc_utils.py
@@ -2,16 +2,9 @@
 # Simplified BSD License (see licenses/simplified_bsd.txt or
 # https://opensource.org/licenses/BSD-2-Clause)
 
+import re
 import traceback
 
-REQUESTS_IMP_ERR = None
-try:
-    import requests
-    HAS_REQUESTS = True
-except ImportError:
-    REQUESTS_IMP_ERR = traceback.format_exc()
-    HAS_REQUESTS = False
-
 THIRD_LIBRARIES_IMP_ERR = None
 try:
     from keystoneauth1.adapter import Adapter
@@ -22,7 +15,8 @@ except ImportError:
     THIRD_LIBRARIES_IMP_ERR = traceback.format_exc()
     HAS_THIRD_LIBRARIES = False
 
-from ansible.module_utils.basic import AnsibleModule, env_fallback, missing_required_lib
+from ansible.module_utils.basic import (AnsibleModule, env_fallback,
+                                        missing_required_lib)
 from ansible.module_utils._text import to_text
 
 
@@ -41,10 +35,6 @@ def navigate_hash(source, path, default=None):
         return result
 
 
-class HwcRequestException(Exception):
-    pass
-
-
 def remove_empty_from_dict(obj):
     return _DictClean(
         obj,
@@ -57,7 +47,8 @@ def remove_nones_from_dict(obj):
 
 
 def replace_resource_dict(item, value):
-    """ Handles the replacement of dicts with values -> the needed value for HWC API"""
+    """ Handles the replacement of dicts with values ->
+    the needed value for HWC API"""
     if isinstance(item, list):
         items = []
         for i in item:
@@ -84,112 +75,184 @@ def are_dicts_different(expect, actual):
     return DictComparison(expect_vals) != DictComparison(actual_vals)
 
 
-class HwcSession(object):
-    """Handles all authentation and HTTP sessions for HWC API calls."""
+class HwcClientException(Exception):
+    def __init__(self, code, message):
+        super(HwcClientException, self).__init__()
 
+        self._code = code
+        self._message = message
+
+    def __str__(self):
+        msg = " code=%s," % str(self._code) if self._code != 0 else ""
+        return "[HwcClientException]%s message=%s" % (
+            msg, self._message)
+
+
+class HwcClientException404(HwcClientException):
+    def __init__(self, message):
+        super(HwcClientException404, self).__init__(404, message)
+
+    def __str__(self):
+        return "[HwcClientException404] message=%s" % self._message
+
+
+def session_method_wrapper(f):
+    def _wrap(self, url, *args, **kwargs):
+        try:
+            url = self.endpoint + url
+            r = f(self, url, *args, **kwargs)
+        except Exception as ex:
+            raise HwcClientException(
+                0, "Sending request failed, error=%s" % ex)
+
+        result = None
+        if r.content:
+            try:
+                result = r.json()
+            except Exception as ex:
+                raise HwcClientException(
+                    0, "Parsing response to json failed, error: %s" % ex)
+
+        code = r.status_code
+        if code not in [200, 201, 202, 203, 204, 205, 206, 207, 208, 226]:
+            msg = ""
+            for i in [['message'], ['error', 'message']]:
+                try:
+                    msg = navigate_hash(result, i)
+                    break
+                except Exception:
+                    pass
+            else:
+                msg = str(result)
+
+            if code == 404:
+                raise HwcClientException404(msg)
+
+            raise HwcClientException(code, msg)
+
+        return result
+
+    return _wrap
+
+
+class _ServiceClient(object):
+    def __init__(self, client, endpoint, product):
+        self._client = client
+        self._endpoint = endpoint
+        self._default_header = {
+            'User-Agent': "Huawei-Ansible-MM-%s" % product,
+            'Accept': 'application/json',
+        }
+
+    @property
+    def endpoint(self):
+        return self._endpoint
+
+    @session_method_wrapper
+    def get(self, url, body=None, header=None, timeout=None):
+        return self._client.get(url, json=body, timeout=timeout,
+                                headers=self._header(header))
+
+    @session_method_wrapper
+    def post(self, url, body=None, header=None, timeout=None):
+        return self._client.post(url, json=body, timeout=timeout,
+                                 headers=self._header(header))
+
+    @session_method_wrapper
+    def delete(self, url, body=None, header=None, timeout=None):
+        return self._client.delete(url, json=body, timeout=timeout,
+                                   headers=self._header(header))
+
+    @session_method_wrapper
+    def put(self, url, body=None, header=None, timeout=None):
+        return self._client.put(url, json=body, timeout=timeout,
+                                headers=self._header(header))
+
+    def _header(self, header):
+        if header and isinstance(header, dict):
+            for k, v in self._default_header.items():
+                if k not in header:
+                    header[k] = v
+        else:
+            header = self._default_header
+
+        return header
+
+
+class Config(object):
     def __init__(self, module, product):
-        self.module = module
-        self.product = product
-        self._validate()
-        self._session = self._credentials()
-        self._adapter = Adapter(self._session)
+        self._project_client = None
+        self._domain_client = None
+        self._module = module
+        self._product = product
         self._endpoints = {}
-        self._project_id = ""
 
-    def get(self, url, body=None):
+        self._validate()
+        self._gen_provider_client()
+
+    @property
+    def module(self):
+        return self._module
+
+    def client(self, region, service_type, service_level):
+        c = self._project_client
+        if service_level == "domain":
+            c = self._domain_client
+
+        e = self._get_service_endpoint(c, service_type, region)
+
+        return _ServiceClient(c, e, self._product)
+
+    def _gen_provider_client(self):
+        m = self._module
+        p = {
+            "auth_url": m.params['identity_endpoint'],
+            "password": m.params['password'],
+            "username": m.params['user'],
+            "project_name": m.params['project'],
+            "user_domain_name": m.params['domain'],
+            "reauthenticate": True
+        }
+
+        self._project_client = Adapter(
+            session.Session(auth=v3.Password(**p)),
+            raise_exc=False)
+
+        p.pop("project_name")
+        self._domain_client = Adapter(
+            session.Session(auth=v3.Password(**p)),
+            raise_exc=False)
+
+    def _get_service_endpoint(self, client, service_type, region):
+        k = "%s.%s" % (service_type, region if region else "")
+
+        if k in self._endpoints:
+            return self._endpoints.get(k)
+
+        url = None
         try:
-            return self._adapter.get(
-                url, json=body,
-                headers=self._headers(), raise_exc=False)
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
+            url = client.get_endpoint(service_type=service_type,
+                                      region_name=region, interface="public")
+        except Exception as ex:
+            raise HwcClientException(
+                0, "Getting endpoint failed, error=%s" % ex)
 
-    def post(self, url, body=None):
-        try:
-            return self._adapter.post(
-                url, json=body,
-                headers=self._headers(), raise_exc=False)
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
+        if url == "":
+            raise HwcClientException(
+                0, "Can not find the enpoint for %s" % service_type)
 
-    def delete(self, url, body=None):
-        try:
-            return self._adapter.delete(
-                url, json=body,
-                headers=self._headers(), raise_exc=False)
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
-
-    def put(self, url, body=None):
-        try:
-            return self._adapter.put(
-                url, json=body,
-                headers=self._headers(), raise_exc=False)
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
-
-    def get_service_endpoint(self, service_type):
-        if self._endpoints.get(service_type):
-            return self._endpoints.get(service_type)
-
-        e = None
-        try:
-            e = self._session.get_endpoint_data(
-                service_type=service_type,
-                region_name=self.module.params['region']
-            )
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
-
-        if not e or e.url == "":
-            self.module.fail_json(
-                msg="Can not find the endpoint for %s" % service_type)
-
-        url = e.url
         if url[-1] != "/":
             url += "/"
 
-        self._endpoints[service_type] = url
+        self._endpoints[k] = url
         return url
 
-    def get_project_id(self):
-        if self._project_id:
-            return self._project_id
-        try:
-            pid = self._session.get_project_id()
-            self._project_id = pid
-            return pid
-        except getattr(requests.exceptions, 'RequestException') as inst:
-            self.module.fail_json(msg=inst.message)
-
     def _validate(self):
-        if not HAS_REQUESTS:
-            self.module.fail_json(msg=missing_required_lib('requests'),
-                                  exception=REQUESTS_IMP_ERR)
-
         if not HAS_THIRD_LIBRARIES:
             self.module.fail_json(
                 msg=missing_required_lib('keystoneauth1'),
                 exception=THIRD_LIBRARIES_IMP_ERR)
 
-    def _credentials(self):
-        auth = v3.Password(
-            auth_url=self.module.params['identity_endpoint'],
-            password=self.module.params['password'],
-            username=self.module.params['user'],
-            user_domain_name=self.module.params['domain'],
-            project_name=self.module.params['project'],
-            reauthenticate=True
-        )
-
-        return session.Session(auth=auth)
-
-    def _headers(self):
-        return {
-            'User-Agent': "Huawei-Ansible-MM-%s" % self.product,
-            'Accept': 'application/json',
-        }
-
 
 class HwcModule(AnsibleModule):
     def __init__(self, *args, **kwargs):
@@ -322,3 +385,30 @@ class _DictClean(object):
             if self.keep_it(v1):
                 r.append(v1)
         return r
+
+
+def build_path(module, path, kv=None):
+    if kv is None:
+        kv = dict()
+
+    v = {}
+    for p in re.findall(r"{[^/]*}", path):
+        n = p[1:][:-1]
+
+        if n in kv:
+            v[n] = str(kv[n])
+
+        else:
+            if n in module.params:
+                v[n] = str(module.params.get(n))
+            else:
+                v[n] = ""
+
+    return path.format(**v)
+
+
+def get_region(module):
+    if module.params['region']:
+        return module.params['region']
+
+    return module.params['project_name'].split("_")[0]
diff --git a/lib/ansible/modules/cloud/huawei/hwc_network_vpc.py b/lib/ansible/modules/cloud/huawei/hwc_network_vpc.py
index b2816d34c7..98d13ddd2e 100644
--- a/lib/ansible/modules/cloud/huawei/hwc_network_vpc.py
+++ b/lib/ansible/modules/cloud/huawei/hwc_network_vpc.py
@@ -110,12 +110,12 @@ RETURN = '''
 # Imports
 ###############################################################################
 
-from ansible.module_utils.hwc_utils import (HwcSession, HwcModule,
-                                            DictComparison, navigate_hash,
-                                            remove_nones_from_dict,
+from ansible.module_utils.hwc_utils import (Config, HwcModule, get_region,
+                                            HwcClientException, navigate_hash,
+                                            HwcClientException404,
+                                            remove_nones_from_dict, build_path,
                                             remove_empty_from_dict,
                                             are_dicts_different)
-import json
 import re
 import time
 
@@ -135,18 +135,19 @@ def main():
         ),
         supports_check_mode=True,
     )
-    session = HwcSession(module, 'network')
+    config = Config(module, 'vpc')
 
     state = module.params['state']
 
     if (not module.params.get("id")) and module.params.get("name"):
-        module.params['id'] = get_id_by_name(session)
+        module.params['id'] = get_id_by_name(config)
 
     fetch = None
-    link = self_link(session)
+    link = self_link(module)
     # the link will include Nones if required format parameters are missed
     if not re.search('/None/|/None$', link):
-        fetch = fetch_resource(session, link)
+        client = config.client(get_region(module), "vpc", "project")
+        fetch = fetch_resource(module, client, link)
         if fetch:
             fetch = fetch.get('vpc')
     changed = False
@@ -157,20 +158,20 @@ def main():
             current_state = response_to_hash(module, fetch)
             if are_dicts_different(expect, current_state):
                 if not module.check_mode:
-                    fetch = update(session, self_link(session), [200])
+                    fetch = update(config, self_link(module))
                     fetch = response_to_hash(module, fetch.get('vpc'))
                 changed = True
             else:
                 fetch = current_state
         else:
             if not module.check_mode:
-                delete(session, self_link(session))
+                delete(config, self_link(module))
                 fetch = {}
             changed = True
     else:
         if state == 'present':
             if not module.check_mode:
-                fetch = create(session, collection(session), [200])
+                fetch = create(config, "vpcs")
                 fetch = response_to_hash(module, fetch.get('vpc'))
             changed = True
         else:
@@ -181,72 +182,89 @@ def main():
     module.exit_json(**fetch)
 
 
-def create(session, link, success_codes=None):
-    if not success_codes:
-        success_codes = [201, 202]
-    module = session.module
-    r = return_if_object(module, session.post(link, resource_to_create(module)), success_codes)
+def create(config, link):
+    module = config.module
+    client = config.client(get_region(module), "vpc", "project")
 
-    wait_done = wait_for_operation(session, 'create', r)
+    r = None
+    try:
+        r = client.post(link, resource_to_create(module))
+    except HwcClientException as ex:
+        msg = ("module(hwc_network_vpc): error creating "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
 
-    url = resource_get_url(session, wait_done)
-    return fetch_resource(session, url)
+    wait_done = wait_for_operation(config, 'create', r)
+
+    v = navigate_hash(wait_done, ['vpc', 'id'])
+    url = build_path(module, 'vpcs/{op_id}', {'op_id': v})
+    return fetch_resource(module, client, url)
 
 
-def update(session, link, success_codes=None):
-    if not success_codes:
-        success_codes = [201, 202]
-    module = session.module
-    r = return_if_object(module, session.put(link, resource_to_update(module)), success_codes)
+def update(config, link):
+    module = config.module
+    client = config.client(get_region(module), "vpc", "project")
 
-    wait_done = wait_for_operation(session, 'update', r)
+    r = None
+    try:
+        r = client.put(link, resource_to_update(module))
+    except HwcClientException as ex:
+        msg = ("module(hwc_network_vpc): error updating "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
 
-    url = resource_get_url(session, wait_done)
-    return fetch_resource(session, url)
+    wait_for_operation(config, 'update', r)
+
+    return fetch_resource(module, client, link)
 
 
-def delete(session, link, success_codes=None):
-    if not success_codes:
-        success_codes = [202, 204]
-    return_if_object(session.module, session.delete(link), success_codes, False)
+def delete(config, link):
+    module = config.module
+    client = config.client(get_region(module), "vpc", "project")
 
-    wait_for_delete(session, link)
+    try:
+        client.delete(link)
+    except HwcClientException as ex:
+        msg = ("module(hwc_network_vpc): error deleting "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
+
+    wait_for_delete(module, client, link)
 
 
-def fetch_resource(session, link, success_codes=None):
-    if not success_codes:
-        success_codes = [200]
-    return return_if_object(session.module, session.get(link), success_codes)
+def fetch_resource(module, client, link):
+    try:
+        return client.get(link)
+    except HwcClientException as ex:
+        msg = ("module(hwc_network_vpc): error fetching "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
 
 
-def link_wrapper(f):
-    def _wrapper(module, *args, **kwargs):
-        try:
-            return f(module, *args, **kwargs)
-        except KeyError as ex:
-            module.fail_json(
-                msg="Mapping keys(%s) are not found in generating link." % ex)
-
-    return _wrapper
-
-
-def get_id_by_name(session):
-    module = session.module
+def get_id_by_name(config):
+    module = config.module
+    client = config.client(get_region(module), "vpc", "project")
     name = module.params.get("name")
-    link = list_link(session, {'limit': 10, 'marker': '{marker}'})
+    link = "vpcs"
+    query_link = "?marker={marker}&limit=10"
+    link += query_link
     not_format_keys = re.findall("={marker}", link)
     none_values = re.findall("=None", link)
 
     if not (not_format_keys or none_values):
-        r = fetch_resource(session, link)
+        r = None
+        try:
+            r = client.get(link)
+        except Exception:
+            pass
         if r is None:
-            return ""
+            return None
         r = r.get('vpcs', [])
         ids = [
             i.get('id') for i in r if i.get('name', '') == name
         ]
         if not ids:
-            return ""
+            return None
         elif len(ids) == 1:
             return ids[0]
         else:
@@ -258,7 +276,11 @@ def get_id_by_name(session):
         p = {'marker': ''}
         ids = set()
         while True:
-            r = fetch_resource(session, link.format(**p))
+            r = None
+            try:
+                r = client.get(link.format(**p))
+            except Exception:
+                pass
             if r is None:
                 break
             r = r.get('vpcs', [])
@@ -273,68 +295,11 @@ def get_id_by_name(session):
 
             p['marker'] = r[-1].get('id')
 
-        return ids.pop() if ids else ""
+        return ids.pop() if ids else None
 
 
-@link_wrapper
-def list_link(session, extra_data=None):
-    url = "{endpoint}vpcs?limit={limit}&marker={marker}"
-
-    combined = session.module.params.copy()
-    if extra_data:
-        combined.update(extra_data)
-
-    combined['endpoint'] = session.get_service_endpoint('vpc')
-
-    return url.format(**combined)
-
-
-@link_wrapper
-def self_link(session):
-    url = "{endpoint}vpcs/{id}"
-
-    combined = session.module.params.copy()
-    combined['endpoint'] = session.get_service_endpoint('vpc')
-
-    return url.format(**combined)
-
-
-@link_wrapper
-def collection(session):
-    url = "{endpoint}vpcs"
-
-    combined = session.module.params.copy()
-    combined['endpoint'] = session.get_service_endpoint('vpc')
-
-    return url.format(**combined)
-
-
-def return_if_object(module, response, success_codes, has_content=True):
-    code = response.status_code
-
-    # If not found, return nothing.
-    if code == 404:
-        return None
-
-    success_codes = [200, 201, 202, 203, 204, 205, 206, 207, 208, 226]
-    # If no content, return nothing.
-    if code in success_codes and not has_content:
-        return None
-
-    result = None
-    try:
-        result = response.json()
-    except getattr(json.decoder, 'JSONDecodeError', ValueError) as inst:
-        module.fail_json(msg="Invalid JSON response with error: %s" % inst)
-
-    if code not in success_codes:
-        msg = navigate_hash(result, ['message'])
-        if msg:
-            module.fail_json(msg=msg)
-        else:
-            module.fail_json(msg="operation failed, return code=%d" % code)
-
-    return result
+def self_link(module):
+    return build_path(module, "vpcs/{id}")
 
 
 def resource_to_create(module):
@@ -376,33 +341,11 @@ def response_to_hash(module, response):
     }
 
 
-@link_wrapper
-def resource_get_url(session, wait_done):
-    combined = session.module.params.copy()
-    combined['op_id'] = navigate_hash(wait_done, ['vpc', 'id'])
-    url = 'vpcs/{op_id}'.format(**combined)
-
-    endpoint = session.get_service_endpoint('vpc')
-    return endpoint + url
-
-
-@link_wrapper
-def async_op_url(session, extra_data=None):
-    url = "{endpoint}vpcs/{op_id}"
-
-    combined = session.module.params.copy()
-    if extra_data:
-        combined.update(extra_data)
-
-    combined['endpoint'] = session.get_service_endpoint('vpc')
-
-    return url.format(**combined)
-
-
-def wait_for_operation(session, op_type, op_result):
+def wait_for_operation(config, op_type, op_result):
+    module = config.module
     op_id = navigate_hash(op_result, ['vpc', 'id'])
-    url = async_op_url(session, {'op_id': op_id})
-    timeout = 60 * int(session.module.params['timeouts'][op_type].rstrip('m'))
+    url = build_path(module, "vpcs/{op_id}", {'op_id': op_id})
+    timeout = 60 * int(module.params['timeouts'][op_type].rstrip('m'))
     states = {
         'create': {
             'allowed': ['CREATING', 'DONW', 'OK'],
@@ -415,16 +358,17 @@ def wait_for_operation(session, op_type, op_result):
     }
 
     return wait_for_completion(url, timeout, states[op_type]['allowed'],
-                               states[op_type]['complete'], session)
+                               states[op_type]['complete'], config)
 
 
 def wait_for_completion(op_uri, timeout, allowed_states,
-                        complete_states, session):
-    module = session.module
+                        complete_states, config):
+    module = config.module
+    client = config.client(get_region(module), "vpc", "project")
     end = time.time() + timeout
     while time.time() <= end:
         try:
-            op_result = fetch_resource(session, op_uri)
+            op_result = fetch_resource(module, client, op_uri)
         except Exception:
             time.sleep(1.0)
             continue
@@ -448,20 +392,20 @@ def raise_if_errors(response, module):
         module.fail_json(msg=navigate_hash(response, []))
 
 
-def wait_for_delete(session, link):
+def wait_for_delete(module, client, link):
     end = time.time() + 60 * int(
-        session.module.params['timeouts']['delete'].rstrip('m'))
+        module.params['timeouts']['delete'].rstrip('m'))
     while time.time() <= end:
         try:
-            resp = session.get(link)
-            if resp.status_code == 404:
-                return
+            client.get(link)
+        except HwcClientException404:
+            return
         except Exception:
             pass
 
         time.sleep(1.0)
 
-    session.module.fail_json(msg="Timeout to wait for deletion to be complete.")
+    module.fail_json(msg="Timeout to wait for deletion to be complete.")
 
 
 class VpcRoutesArray(object):
diff --git a/lib/ansible/modules/cloud/huawei/hwc_smn_topic.py b/lib/ansible/modules/cloud/huawei/hwc_smn_topic.py
index e001819565..ad4eff099d 100644
--- a/lib/ansible/modules/cloud/huawei/hwc_smn_topic.py
+++ b/lib/ansible/modules/cloud/huawei/hwc_smn_topic.py
@@ -109,12 +109,11 @@ update_time:
 # Imports
 ###############################################################################
 
-from ansible.module_utils.hwc_utils import (HwcSession, HwcModule,
-                                            DictComparison, navigate_hash,
-                                            remove_nones_from_dict,
+from ansible.module_utils.hwc_utils import (Config, HwcModule, build_path,
+                                            HwcClientException, navigate_hash,
+                                            remove_nones_from_dict, get_region,
                                             remove_empty_from_dict,
                                             are_dicts_different)
-import json
 import re
 
 ###############################################################################
@@ -135,18 +134,19 @@ def main():
         supports_check_mode=True,
     )
 
-    session = HwcSession(module, "app")
+    config = Config(module, "smn")
 
     state = module.params['state']
 
     if not module.params.get("id"):
-        module.params['id'] = get_resource_id(session)
+        module.params['id'] = get_resource_id(config)
 
     fetch = None
-    link = self_link(session)
+    link = self_link(module)
     # the link will include Nones if required format parameters are missed
     if not re.search('/None/|/None$', link):
-        fetch = fetch_resource(session, link)
+        client = config.client(get_region(module), "smn", "project")
+        fetch = fetch_resource(module, client, link)
     changed = False
 
     if fetch:
@@ -155,20 +155,20 @@ def main():
             current_state = response_to_hash(module, fetch)
             if are_dicts_different(expect, current_state):
                 if not module.check_mode:
-                    fetch = update(session)
+                    fetch = update(config)
                     fetch = response_to_hash(module, fetch)
                 changed = True
             else:
                 fetch = current_state
         else:
             if not module.check_mode:
-                delete(session)
+                delete(config)
                 fetch = {}
             changed = True
     else:
         if state == 'present':
             if not module.check_mode:
-                fetch = create(session)
+                fetch = create(config)
                 fetch = response_to_hash(module, fetch)
             changed = True
         else:
@@ -179,96 +179,86 @@ def main():
     module.exit_json(**fetch)
 
 
-def create(session):
-    link = collection(session)
-    module = session.module
-    success_codes = [201, 202]
-    r = return_if_object(module,
-                         session.post(link, create_resource_opts(module)),
-                         success_codes)
+def create(config):
+    module = config.module
+    client = config.client(get_region(module), "smn", "project")
 
-    return get_resource(session, r)
-
-
-def update(session):
-    link = self_link(session)
-    success_codes = [201, 202]
-    module = session.module
-    r = return_if_object(module, session.put(link, update_resource_opts(module)), success_codes)
-
-    return get_resource(session, r)
-
-
-def delete(session):
-    link = self_link(session)
-    success_codes = [202, 204]
-    return_if_object(session.module, session.delete(link), success_codes, False)
-
-
-def link_wrapper(f):
-    def _wrapper(module, *args, **kwargs):
-        try:
-            return f(module, *args, **kwargs)
-        except KeyError as ex:
-            module.fail_json(
-                msg="Mapping keys(%s) are not found in generating link." % ex)
-
-    return _wrapper
-
-
-def return_if_object(module, response, success_codes, has_content=True):
-    code = response.status_code
-
-    # If not found, return nothing.
-    if code == 404:
-        return None
-
-    if not success_codes:
-        success_codes = [200, 201, 202, 203, 204, 205, 206, 207, 208, 226]
-    # If no content, return nothing.
-    if code in success_codes and not has_content:
-        return None
-
-    result = None
+    link = "notifications/topics"
+    r = None
     try:
-        result = response.json()
-    except getattr(json.decoder, 'JSONDecodeError', ValueError) as inst:
-        module.fail_json(msg="Invalid JSON response with error: %s" % inst)
+        r = client.post(link, create_resource_opts(module))
+    except HwcClientException as ex:
+        msg = ("module(hwc_smn_topic): error creating "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
 
-    if code not in success_codes:
-        msg = navigate_hash(result, ['message'])
-        if msg:
-            module.fail_json(msg=msg)
-        else:
-            module.fail_json(msg="operation failed, return code=%d" % code)
-
-    return result
+    return get_resource(config, r)
 
 
-def fetch_resource(session, link, success_codes=None):
-    if not success_codes:
-        success_codes = [200]
-    return return_if_object(session.module, session.get(link), success_codes)
+def update(config):
+    module = config.module
+    client = config.client(get_region(module), "smn", "project")
+
+    link = self_link(module)
+    try:
+        client.put(link, update_resource_opts(module))
+    except HwcClientException as ex:
+        msg = ("module(hwc_smn_topic): error updating "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
+
+    return fetch_resource(module, client, link)
 
 
-def get_resource(session, result):
-    combined = session.module.params.copy()
-    combined['topic_urn'] = navigate_hash(result, ['topic_urn'])
-    url = 'notifications/topics/{topic_urn}'.format(**combined)
+def delete(config):
+    module = config.module
+    client = config.client(get_region(module), "smn", "project")
 
-    e = session.get_service_endpoint('compute')
-    url = e.replace("ecs", "smn") + url
-    return fetch_resource(session, url)
+    link = self_link(module)
+    try:
+        client.delete(link)
+    except HwcClientException as ex:
+        msg = ("module(hwc_smn_topic): error deleting "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
 
 
-def get_resource_id(session):
-    module = session.module
-    link = list_link(session, {'limit': 10, 'offset': '{offset}'})
+def fetch_resource(module, client, link):
+    try:
+        return client.get(link)
+    except HwcClientException as ex:
+        msg = ("module(hwc_smn_topic): error fetching "
+               "resource, error: %s" % str(ex))
+        module.fail_json(msg=msg)
+
+
+def get_resource(config, result):
+    module = config.module
+    client = config.client(get_region(module), "smn", "project")
+
+    d = {'topic_urn': navigate_hash(result, ['topic_urn'])}
+    url = build_path(module, 'notifications/topics/{topic_urn}', d)
+
+    return fetch_resource(module, client, url)
+
+
+def get_resource_id(config):
+    module = config.module
+    client = config.client(get_region(module), "smn", "project")
+
+    link = "notifications/topics"
+    query_link = "?offset={offset}&limit=10"
+    link += query_link
+
     p = {'offset': 0}
     v = module.params.get('name')
     ids = set()
     while True:
-        r = fetch_resource(session, link.format(**p))
+        r = None
+        try:
+            r = client.get(link.format(**p))
+        except Exception:
+            pass
         if r is None:
             break
         r = r.get('topics', [])
@@ -285,42 +275,8 @@ def get_resource_id(session):
     return ids.pop() if ids else None
 
 
-@link_wrapper
-def list_link(session, extra_data=None):
-    url = "{endpoint}notifications/topics?limit={limit}&offset={offset}"
-
-    combined = session.module.params.copy()
-    if extra_data:
-        combined.update(extra_data)
-
-    e = session.get_service_endpoint('compute')
-    combined['endpoint'] = e.replace("ecs", "smn")
-
-    return url.format(**combined)
-
-
-@link_wrapper
-def self_link(session):
-    url = "{endpoint}notifications/topics/{id}"
-
-    combined = session.module.params.copy()
-
-    e = session.get_service_endpoint('compute')
-    combined['endpoint'] = e.replace("ecs", "smn")
-
-    return url.format(**combined)
-
-
-@link_wrapper
-def collection(session):
-    url = "{endpoint}notifications/topics"
-
-    combined = session.module.params.copy()
-
-    e = session.get_service_endpoint('compute')
-    combined['endpoint'] = e.replace("ecs", "smn")
-
-    return url.format(**combined)
+def self_link(module):
+    return build_path(module, "notifications/topics/{id}")
 
 
 def create_resource_opts(module):