add support for multiple regions in Opentack

lib/fog/core/errors.rb

@@ -57,6 +57,7 @@ An alternate file may be used by placing its path in the FOG_RC environment vari
   :openstack_username:
   :openstack_auth_url:
   :openstack_tenant:
+  :openstack_region:
   :ovirt_username:
   :ovirt_password:
   :ovirt_url:

lib/fog/openstack.rb

@@ -80,6 +80,7 @@ module Fog
       @service_name         = options[:openstack_service_name]
       @identity_service_name = options[:openstack_identity_service_name]
       @endpoint_type         = options[:openstack_endpoint_type] || 'publicURL'
+      @openstack_region      = options[:openstack_region]
 
       if @openstack_auth_token
         req_body = {
@@ -133,6 +134,12 @@ module Fog
           detect{|x| @service_name.include?(x['type']) }
       end
 
+      svc['endpoints'] = svc['endpoints'].select{ |x| x['region'] == @openstack_region } if @openstack_region
+      if svc['endpoints'].count > 1
+         regions = svc["endpoints"].map { |x| x['region'] }.uniq.join(',')
+         raise Errors::NotFound.new("Multiple regions available choose one of these '#{regions}'")
+      end
+
       identity_svc = body['access']['serviceCatalog'].
         detect{|x| @identity_service_name.include?(x['type']) } if @identity_service_name
       tenant = body['access']['token']['tenant']

lib/fog/openstack/compute.rb

@@ -9,7 +9,7 @@ module Fog
       recognizes :openstack_auth_token, :openstack_management_url,
                  :persistent, :openstack_service_name, :openstack_tenant,
                  :openstack_api_key, :openstack_username, :openstack_identity_endpoint,
-                 :current_user, :current_tenant
+                 :current_user, :current_tenant, :openstack_region
 
       ## MODELS
       #
@@ -249,6 +249,7 @@ module Fog
           @openstack_must_reauthenticate  = false
           @openstack_service_name = options[:openstack_service_name] || ['nova', 'compute']
           @openstack_identity_service_name = options[:openstack_identity_service_name] || 'identity'
+          @openstack_region      = options[:openstack_region]
 
           @connection_options = options[:connection_options] || {}
 
@@ -267,6 +268,7 @@ module Fog
             :openstack_auth_token     => @auth_token,
             :openstack_management_url => @openstack_management_url,
             :openstack_identity_endpoint => @openstack_identity_public_endpoint,
+            :openstack_region         => @openstack_region,
             :current_user             => @current_user,
             :current_tenant           => @current_tenant }
         end
@@ -319,6 +321,7 @@ module Fog
               :openstack_username => @openstack_username,
               :openstack_auth_token => @openstack_auth_token,
               :openstack_auth_uri => @openstack_auth_uri,
+              :openstack_region   => @openstack_region,
               :openstack_tenant   => @openstack_tenant,
               :openstack_service_name => @openstack_service_name,
               :openstack_identity_service_name => @openstack_identity_service_name