Making NetworkSettings a dict

Change-Id: Ib7fc4e9ca543a4c678576ea2119fa606ece0095c
Signed-off-by: Dan Radez <dradez@redhat.com>

4 files changed, 94 insertions, 72 deletions

diff --git a/lib/python/apex/common/constants.py b/lib/python/apex/common/constants.py
index ae8ffe31..dfb6267b 100644
--- a/lib/python/apex/common/constants.py
+++ b/lib/python/apex/common/constants.py
@@ -15,7 +15,9 @@ API_NETWORK = 'api_network'
 OPNFV_NETWORK_TYPES = [ADMIN_NETWORK, PRIVATE_NETWORK, PUBLIC_NETWORK,
                        STORAGE_NETWORK, API_NETWORK]
 DNS_SERVERS = ["8.8.8.8", "8.8.4.4"]
-ROLES = ['compute', 'controller']
+COMPUTE = 'compute'
+CONTROLLER = 'controller'
+ROLES = [COMPUTE, CONTROLLER]
 DOMAIN_NAME = 'localdomain.com'
 COMPUTE_PRE = "OS::TripleO::ComputeExtraConfigPre"
 CONTROLLER_PRE = "OS::TripleO::ControllerExtraConfigPre"
diff --git a/lib/python/apex/network_environment.py b/lib/python/apex/network_environment.py
index bf81b98d..22dcc352 100644
--- a/lib/python/apex/network_environment.py
+++ b/lib/python/apex/network_environment.py
@@ -59,17 +59,16 @@ class NetworkEnvironment:
             self.netenv_obj = yaml.load(net_env_fh)
             self._update_net_environment(net_settings)
 
-    def _update_net_environment(self, settings_obj):
+    def _update_net_environment(self, net_settings):
         """
         Updates Network Environment according to Network Settings
         :param: network settings object
         :return:  None
         """
-        if not settings_obj:
+        if not net_settings:
             raise NetworkEnvException("Network Settings does not exist")
 
-        net_settings = settings_obj.get_network_settings()
-        enabled_networks = settings_obj.get_enabled_networks()
+        enabled_networks = net_settings.get_enabled_networks()
         param_def = 'parameter_defaults'
         reg = 'resource_registry'
         for key, prefix in TENANT_RESOURCES.items():
@@ -201,7 +200,7 @@ class NetworkEnvironment:
         # Set IPv6 related flags to True. Not that we do not set those to False
         # when IPv4 is configured, we'll use the default or whatever the user
         # may have set.
-        if settings_obj.get_ip_addr_family() == 6:
+        if net_settings.get_ip_addr_family() == 6:
             for flag in IPV6_FLAGS:
                 self.netenv_obj[param_def][flag] = True
 
diff --git a/lib/python/apex/network_settings.py b/lib/python/apex/network_settings.py
index c81256eb..ca91b8cf 100644
--- a/lib/python/apex/network_settings.py
+++ b/lib/python/apex/network_settings.py
@@ -11,10 +11,22 @@ import yaml
 import logging
 import ipaddress
 from . import ip_utils
-from .common import constants, utils
-
-
-class NetworkSettings:
+from .common.utils import str2bool
+from .common.constants import (
+    ADMIN_NETWORK,
+    PRIVATE_NETWORK,
+    PUBLIC_NETWORK,
+    STORAGE_NETWORK,
+    API_NETWORK,
+    OPNFV_NETWORK_TYPES,
+    DNS_SERVERS,
+    DOMAIN_NAME,
+    ROLES,
+    COMPUTE,
+    CONTROLLER)
+
+
+class NetworkSettings(dict):
     """
     This class parses APEX network settings yaml file into an object. It
     generates or detects all missing fields for deployment.
@@ -27,13 +39,35 @@ class NetworkSettings:
     deployment script move to python.
     """
     def __init__(self, filename, network_isolation):
-        with open(filename, 'r') as network_settings_file:
-            self.settings_obj = yaml.load(network_settings_file)
-            self.network_isolation = network_isolation
-            self.enabled_network_list = []
-            self.nics = {'compute': dict(), 'controller': dict()}
-            self.nics_specified = {'compute': False, 'controller': False}
-            self._validate_input()
+        init_dict = {}
+        if type(filename) is str:
+            with open(filename, 'r') as network_settings_file:
+                init_dict = yaml.load(network_settings_file)
+        else:
+            # assume input is a dict to build from
+            init_dict = filename
+
+        super().__init__(init_dict)
+
+        if 'apex' in self:
+            # merge two dics Nondestructively
+            def merge(pri, sec):
+                for key, val in sec.items():
+                    if key in pri:
+                        if type(val) is dict:
+                            merge(pri[key], val)
+                        # else
+                        # do not overwrite what's already there
+                    else:
+                        pri[key] = val
+            # merge the apex specific config into the first class settings
+            merge(self, copy(self['apex']))
+
+        self.network_isolation = network_isolation
+        self.enabled_network_list = []
+        self.nics = {COMPUTE: {}, CONTROLLER: {}}
+        self.nics_specified = {COMPUTE: False, CONTROLLER: False}
+        self._validate_input()
 
     def _validate_input(self):
         """
@@ -41,23 +75,23 @@ class NetworkSettings:
 
         NetworkSettingsException will be raised if validation fails.
         """
-        if constants.ADMIN_NETWORK not in self.settings_obj or \
-            not utils.str2bool(self.settings_obj[constants.ADMIN_NETWORK].get(
+        if ADMIN_NETWORK not in self or \
+            not str2bool(self[ADMIN_NETWORK].get(
                 'enabled')):
             raise NetworkSettingsException("You must enable admin_network "
                                            "and configure it explicitly or "
                                            "use auto-detection")
         if self.network_isolation and \
-            (constants.PUBLIC_NETWORK not in self.settings_obj or not
-                utils.str2bool(self.settings_obj[constants.PUBLIC_NETWORK].get(
+            (PUBLIC_NETWORK not in self or not
+                str2bool(self[PUBLIC_NETWORK].get(
                     'enabled'))):
             raise NetworkSettingsException("You must enable public_network "
                                            "and configure it explicitly or "
                                            "use auto-detection")
 
-        for network in constants.OPNFV_NETWORK_TYPES:
-            if network in self.settings_obj:
-                if utils.str2bool(self.settings_obj[network].get('enabled')):
+        for network in OPNFV_NETWORK_TYPES:
+            if network in self:
+                if str2bool(self[network].get('enabled')):
                     logging.info("{} enabled".format(network))
                     self._config_required_settings(network)
                     self._config_ip_range(network=network,
@@ -73,10 +107,8 @@ class NetworkSettings:
                 logging.info("{} is not in specified, will collapse with "
                              "admin_network".format(network))
 
-        self.settings_obj['dns_servers'] = self.settings_obj.get(
-            'dns_servers', constants.DNS_SERVERS)
-        self.settings_obj['domain_name'] = self.settings_obj.get(
-            'domain_name', constants.DOMAIN_NAME)
+        self['dns_servers'] = self.get('dns_servers', DNS_SERVERS)
+        self['domain_name'] = self.get('domain_name', DOMAIN_NAME)
 
     def _validate_overcloud_nic_order(self, network):
         """
@@ -92,20 +124,18 @@ class NetworkSettings:
         :return: None
         """
 
-        for role in constants.ROLES:
+        for role in ROLES:
             interface = role+'_interface'
             nic_index = self.get_enabled_networks().index(network) + 1
-            if interface in self.settings_obj[network]:
-                if any(y == self.settings_obj[network][interface] for x, y in
+            if interface in self[network]:
+                if any(y == self[network][interface] for x, y in
                        self.nics[role].items()):
                     raise NetworkSettingsException("Duplicate {} already "
                                                    "specified for "
                                                    "another network"
-                                                   .format(self.settings_obj
-                                                           [network]
+                                                   .format(self[network]
                                                            [interface]))
-                self.nics[role][network] = self.settings_obj[network][
-                    interface]
+                self.nics[role][network] = self[network][interface]
                 self.nics_specified[role] = True
                 logging.info("{} nic order specified for network {"
                              "}".format(role, network))
@@ -135,28 +165,28 @@ class NetworkSettings:
         be an ipaddress.network object, replacing the NIC name.
         """
         # if vlan not defined then default it to native
-        if network is not constants.ADMIN_NETWORK:
-            if 'vlan' not in self.settings_obj[network]:
-                self.settings_obj[network]['vlan'] = 'native'
+        if network is not ADMIN_NETWORK:
+            if 'vlan' not in self[network]:
+                self[network]['vlan'] = 'native'
 
-        cidr = self.settings_obj[network].get('cidr')
-        nic_name = self.settings_obj[network].get('bridged_interface')
+        cidr = self[network].get('cidr')
+        nic_name = self[network].get('bridged_interface')
 
         if cidr:
-            cidr = ipaddress.ip_network(self.settings_obj[network]['cidr'])
-            self.settings_obj[network]['cidr'] = cidr
+            cidr = ipaddress.ip_network(self[network]['cidr'])
+            self[network]['cidr'] = cidr
             logging.info("{}_cidr: {}".format(network, cidr))
             return 0
         elif nic_name:
             # If cidr is not specified, we need to know if we should find
             # IPv6 or IPv4 address on the interface
-            if utils.str2bool(self.settings_obj[network].get('ipv6')):
+            if str2bool(self[network].get('ipv6')):
                 address_family = 6
             else:
                 address_family = 4
             nic_interface = ip_utils.get_interface(nic_name, address_family)
             if nic_interface:
-                self.settings_obj[network]['bridged_interface'] = nic_interface
+                self[network]['bridged_interface'] = nic_interface
                 logging.info("{}_bridged_interface: {}".
                              format(network, nic_interface))
                 return 0
@@ -182,17 +212,17 @@ class NetworkSettings:
         The spec for start_offset, end_offset and count are identical to
         ip_utils.get_ip_range.
         """
-        ip_range = self.settings_obj[network].get(setting)
-        interface = self.settings_obj[network].get('bridged_interface')
+        ip_range = self[network].get(setting)
+        interface = self[network].get('bridged_interface')
 
         if not ip_range:
-            cidr = self.settings_obj[network].get('cidr')
+            cidr = self[network].get('cidr')
             ip_range = ip_utils.get_ip_range(start_offset=start_offset,
                                              end_offset=end_offset,
                                              count=count,
                                              cidr=cidr,
                                              interface=interface)
-            self.settings_obj[network][setting] = ip_range
+            self[network][setting] = ip_range
 
         logging.info("{}_{}: {}".format(network, setting, ip_range))
 
@@ -204,13 +234,13 @@ class NetworkSettings:
 
         The spec for offset is identical to ip_utils.get_ip
         """
-        ip = self.settings_obj[network].get(setting)
-        interface = self.settings_obj[network].get('bridged_interface')
+        ip = self[network].get(setting)
+        interface = self[network].get('bridged_interface')
 
         if not ip:
-            cidr = self.settings_obj[network].get('cidr')
+            cidr = self[network].get('cidr')
             ip = ip_utils.get_ip(offset, cidr, interface)
-            self.settings_obj[network][setting] = ip
+            self[network][setting] = ip
 
         logging.info("{}_{}: {}".format(network, setting, ip))
 
@@ -226,14 +256,14 @@ class NetworkSettings:
             - floating_ip_range
             - gateway
         """
-        if network == constants.ADMIN_NETWORK:
+        if network == ADMIN_NETWORK:
             self._config_ip(network, 'provisioner_ip', 1)
             self._config_ip_range(network=network, setting='dhcp_range',
                                   start_offset=2, count=9)
             self._config_ip_range(network=network,
                                   setting='introspection_range',
                                   start_offset=11, count=9)
-        elif network == constants.PUBLIC_NETWORK:
+        elif network == PUBLIC_NETWORK:
             self._config_ip(network, 'provisioner_ip', 1)
             self._config_ip_range(network=network,
                                   setting='floating_ip_range',
@@ -247,18 +277,18 @@ class NetworkSettings:
         If cidr is specified, we always use the first address in the address
         space for gateway. Otherwise, we detect the system gateway.
         """
-        gateway = self.settings_obj[network].get('gateway')
-        interface = self.settings_obj[network].get('bridged_interface')
+        gateway = self[network].get('gateway')
+        interface = self[network].get('bridged_interface')
 
         if not gateway:
-            cidr = self.settings_obj[network].get('cidr')
+            cidr = self[network].get('cidr')
             if cidr:
                 gateway = ip_utils.get_ip(1, cidr)
             else:
                 gateway = ip_utils.find_gateway(interface)
 
             if gateway:
-                self.settings_obj[network]['gateway'] = gateway
+                self[network]['gateway'] = gateway
             else:
                 raise NetworkSettingsException("Failed to set gateway")
 
@@ -273,18 +303,17 @@ class NetworkSettings:
         """
         bash_str = ''
         for network in self.enabled_network_list:
-            for key, value in self.settings_obj[network].items():
+            for key, value in self[network].items():
                 bash_str += "{}_{}={}\n".format(network, key, value)
         bash_str += "enabled_network_list='{}'\n" \
             .format(' '.join(self.enabled_network_list))
         bash_str += "ip_addr_family={}\n".format(self.get_ip_addr_family())
         dns_list = ""
-        for dns_server in self.settings_obj['dns_servers']:
+        for dns_server in self['dns_servers']:
             dns_list = dns_list + "{} ".format(dns_server)
         dns_list = dns_list.strip()
         bash_str += "dns_servers=\'{}\'\n".format(dns_list)
-        bash_str += "domain_name=\'{}\'\n".format(self.settings_obj[
-                                                  'domain_name'])
+        bash_str += "domain_name=\'{}\'\n".format(self['domain_name'])
         if path:
             with open(path, 'w') as file:
                 file.write(bash_str)
@@ -299,19 +328,12 @@ class NetworkSettings:
         IPv6.
         """
         for network in self.enabled_network_list:
-            cidr = ipaddress.ip_network(self.settings_obj[network]['cidr'])
+            cidr = ipaddress.ip_network(self[network]['cidr'])
             if cidr.version == 6:
                 return 6
 
         return 4
 
-    def get_network_settings(self):
-        """
-        Getter for network settings
-        :return: network settings dictionary
-        """
-        return self.settings_obj
-
     def get_enabled_networks(self):
         """
         Getter for enabled network list
diff --git a/lib/python/apex_python_utils.py b/lib/python/apex_python_utils.py
index c548437d..4820fe4d 100755
--- a/lib/python/apex_python_utils.py
+++ b/lib/python/apex_python_utils.py
@@ -97,14 +97,13 @@ def build_nic_template(args):
 
     network_settings = NetworkSettings(args.net_settings_file,
                                        args.network_isolation)
-    settings = network_settings.settings_obj
     env = Environment(loader=FileSystemLoader(template_dir))
     template = env.get_template(template)
 
     # gather vlan values into a dict
     net_list = copy(args.enabled_networks).split(' ')
     net_list.remove(ADMIN_NETWORK)
-    vlans_vals = map(lambda x: settings[x]['vlan'], net_list)
+    vlans_vals = map(lambda x: network_settings[x]['vlan'], net_list)
     vlans = dict(zip(net_list, vlans_vals))
     nics = network_settings.nics