Simplify and optimize az server output extension.

Displaying two different az results to users is confusing, so just
return the az that the instance is actually in. Also, cache the
result from looking up the az by host for an hour to avoid making
lots of expensive db requests.

DocImpact

Change-Id: Ib39bf94c608874695aab00e61035e64f9594a985

8 files changed, 16 insertions, 20 deletions

diff --git a/doc/api_samples/OS-EXT-AZ/server-get-resp.json b/doc/api_samples/OS-EXT-AZ/server-get-resp.json
index a7cf031ef..c2f0fb2ba 100644
--- a/doc/api_samples/OS-EXT-AZ/server-get-resp.json
+++ b/doc/api_samples/OS-EXT-AZ/server-get-resp.json
@@ -1,7 +1,6 @@
 {
     "server": {
-        "OS-EXT-AZ:availability_zone": null,
-        "OS-EXT-AZ:host_availability_zone": "nova",
+        "OS-EXT-AZ:availability_zone": "nova",
         "accessIPv4": "",
         "accessIPv6": "",
         "addresses": {
@@ -53,4 +52,4 @@
         "updated": "2013-01-30T13:38:49Z",
         "user_id": "fake"
     }
-}
\ No newline at end of file
+}
diff --git a/doc/api_samples/OS-EXT-AZ/server-get-resp.xml b/doc/api_samples/OS-EXT-AZ/server-get-resp.xml
index 7a6edf057..5025af4e8 100644
--- a/doc/api_samples/OS-EXT-AZ/server-get-resp.xml
+++ b/doc/api_samples/OS-EXT-AZ/server-get-resp.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<server xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns="http://docs.openstack.org/compute/api/v1.1" status="ACTIVE" updated="2013-01-30T14:29:20Z" hostId="471e52951e3182954c5a93489dafc3fc38a9ef3e0b62d26dc740460c" name="new-server-test" created="2013-01-30T14:29:19Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="26ea8424-758d-483a-addc-9a5905afc9e6" OS-EXT-AZ:host_availability_zone="nova" OS-EXT-AZ:availability_zone="None">
+<server xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns="http://docs.openstack.org/compute/api/v1.1" status="ACTIVE" updated="2013-01-30T14:29:20Z" hostId="471e52951e3182954c5a93489dafc3fc38a9ef3e0b62d26dc740460c" name="new-server-test" created="2013-01-30T14:29:19Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="26ea8424-758d-483a-addc-9a5905afc9e6" OS-EXT-AZ:availability_zone="nova">
   <image id="70a599e0-31e7-49b7-b260-868f441e862b">
     <atom:link href="http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b" rel="bookmark"/>
   </image>
@@ -16,4 +16,4 @@
   </addresses>
   <atom:link href="http://openstack.example.com/v2/openstack/servers/26ea8424-758d-483a-addc-9a5905afc9e6" rel="self"/>
   <atom:link href="http://openstack.example.com/openstack/servers/26ea8424-758d-483a-addc-9a5905afc9e6" rel="bookmark"/>
-</server>
\ No newline at end of file
+</server>
diff --git a/doc/api_samples/OS-EXT-AZ/servers-detail-resp.json b/doc/api_samples/OS-EXT-AZ/servers-detail-resp.json
index 5fab02ac0..2ecea959a 100644
--- a/doc/api_samples/OS-EXT-AZ/servers-detail-resp.json
+++ b/doc/api_samples/OS-EXT-AZ/servers-detail-resp.json
@@ -1,8 +1,7 @@
 {
     "servers": [
         {
-            "OS-EXT-AZ:availability_zone": null,
-            "OS-EXT-AZ:host_availability_zone": "nova",
+            "OS-EXT-AZ:availability_zone": "nova",
             "accessIPv4": "",
             "accessIPv6": "",
             "addresses": {
@@ -55,4 +54,4 @@
             "user_id": "fake"
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/doc/api_samples/OS-EXT-AZ/servers-detail-resp.xml b/doc/api_samples/OS-EXT-AZ/servers-detail-resp.xml
index 4f1f311a8..4cdf79334 100644
--- a/doc/api_samples/OS-EXT-AZ/servers-detail-resp.xml
+++ b/doc/api_samples/OS-EXT-AZ/servers-detail-resp.xml
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <servers xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns="http://docs.openstack.org/compute/api/v1.1">
-  <server status="ACTIVE" updated="2013-01-30T14:29:20Z" hostId="85adf7d0492dedf0a7e3dc44ef7d16186b768ca3df33c4d608e630d9" name="new-server-test" created="2013-01-30T14:29:19Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="a668c72d-2bac-4806-a297-c7c11d97e3b3" OS-EXT-AZ:host_availability_zone="nova" OS-EXT-AZ:availability_zone="None">
+  <server status="ACTIVE" updated="2013-01-30T14:29:20Z" hostId="85adf7d0492dedf0a7e3dc44ef7d16186b768ca3df33c4d608e630d9" name="new-server-test" created="2013-01-30T14:29:19Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="a668c72d-2bac-4806-a297-c7c11d97e3b3" OS-EXT-AZ:availability_zone="nova">
     <image id="70a599e0-31e7-49b7-b260-868f441e862b">
       <atom:link href="http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b" rel="bookmark"/>
     </image>
@@ -18,4 +18,4 @@
     <atom:link href="http://openstack.example.com/v2/openstack/servers/a668c72d-2bac-4806-a297-c7c11d97e3b3" rel="self"/>
     <atom:link href="http://openstack.example.com/openstack/servers/a668c72d-2bac-4806-a297-c7c11d97e3b3" rel="bookmark"/>
   </server>
-</servers>
\ No newline at end of file
+</servers>
diff --git a/doc/api_samples/all_extensions/server-get-resp.json b/doc/api_samples/all_extensions/server-get-resp.json
index f3dedd7d0..63f955ed6 100644
--- a/doc/api_samples/all_extensions/server-get-resp.json
+++ b/doc/api_samples/all_extensions/server-get-resp.json
@@ -1,8 +1,7 @@
 {
     "server": {
         "OS-DCF:diskConfig": "AUTO",
-        "OS-EXT-AZ:availability_zone": null,
-        "OS-EXT-AZ:host_availability_zone": "nova",
+        "OS-EXT-AZ:availability_zone": "nova",
         "OS-EXT-SRV-ATTR:host": "b00875071c774b5487d217b82f03dfa2",
         "OS-EXT-SRV-ATTR:hypervisor_hostname": "fake-mini",
         "OS-EXT-SRV-ATTR:instance_name": "instance-00000001",
@@ -68,4 +67,4 @@
         "updated": "2013-02-07T18:58:57Z",
         "user_id": "fake"
     }
-}
\ No newline at end of file
+}
diff --git a/doc/api_samples/all_extensions/server-get-resp.xml b/doc/api_samples/all_extensions/server-get-resp.xml
index 8a2ddf4e3..e2ded16e5 100644
--- a/doc/api_samples/all_extensions/server-get-resp.xml
+++ b/doc/api_samples/all_extensions/server-get-resp.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<server xmlns:OS-DCF="http://docs.openstack.org/compute/ext/disk_config/api/v1.1" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:OS-EXT-SRV-ATTR="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-IPS="http://docs.openstack.org/compute/ext/extended_ips/api/v1.1" xmlns:OS-EXT-STS="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns="http://docs.openstack.org/compute/api/v1.1" status="ACTIVE" updated="2013-02-07T19:01:59Z" hostId="06d1cfd52be5f5d197193db2842978235fd085bd2dfaea32e5068468" name="new-server-test" created="2013-02-07T19:01:58Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="6be39927-53b2-4aee-8593-1c72b3673168" key_name="None" config_drive="" OS-EXT-SRV-ATTR:vm_state="active" OS-EXT-SRV-ATTR:task_state="None" OS-EXT-SRV-ATTR:power_state="1" OS-EXT-SRV-ATTR:instance_name="instance-00000001" OS-EXT-SRV-ATTR:host="b98603db318e495e819601702d16c512" OS-EXT-SRV-ATTR:hypervisor_hostname="fake-mini" OS-EXT-AZ:host_availability_zone="nova" OS-EXT-AZ:availability_zone="None" OS-DCF:diskConfig="AUTO">
+<server xmlns:OS-DCF="http://docs.openstack.org/compute/ext/disk_config/api/v1.1" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:OS-EXT-SRV-ATTR="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-IPS="http://docs.openstack.org/compute/ext/extended_ips/api/v1.1" xmlns:OS-EXT-STS="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns="http://docs.openstack.org/compute/api/v1.1" status="ACTIVE" updated="2013-02-07T19:01:59Z" hostId="06d1cfd52be5f5d197193db2842978235fd085bd2dfaea32e5068468" name="new-server-test" created="2013-02-07T19:01:58Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="6be39927-53b2-4aee-8593-1c72b3673168" key_name="None" config_drive="" OS-EXT-SRV-ATTR:vm_state="active" OS-EXT-SRV-ATTR:task_state="None" OS-EXT-SRV-ATTR:power_state="1" OS-EXT-SRV-ATTR:instance_name="instance-00000001" OS-EXT-SRV-ATTR:host="b98603db318e495e819601702d16c512" OS-EXT-SRV-ATTR:hypervisor_hostname="fake-mini" OS-EXT-AZ:availability_zone="nova" OS-DCF:diskConfig="AUTO">
   <image id="70a599e0-31e7-49b7-b260-868f441e862b">
     <atom:link href="http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b" rel="bookmark"/>
   </image>
@@ -19,4 +19,4 @@
   <security_groups>
     <security_group name="default"/>
   </security_groups>
-</server>
\ No newline at end of file
+</server>
diff --git a/doc/api_samples/all_extensions/servers-details-resp.json b/doc/api_samples/all_extensions/servers-details-resp.json
index 475bce39b..cc945edb5 100644
--- a/doc/api_samples/all_extensions/servers-details-resp.json
+++ b/doc/api_samples/all_extensions/servers-details-resp.json
@@ -2,8 +2,7 @@
     "servers": [
         {
             "OS-DCF:diskConfig": "AUTO",
-            "OS-EXT-AZ:availability_zone": null,
-            "OS-EXT-AZ:host_availability_zone": "nova",
+            "OS-EXT-AZ:availability_zone": "nova",
             "OS-EXT-SRV-ATTR:host": "33924d68ef4e4214bb9bc200178d23b8",
             "OS-EXT-SRV-ATTR:hypervisor_hostname": "fake-mini",
             "OS-EXT-SRV-ATTR:instance_name": "instance-00000001",
@@ -70,4 +69,4 @@
             "user_id": "fake"
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/doc/api_samples/all_extensions/servers-details-resp.xml b/doc/api_samples/all_extensions/servers-details-resp.xml
index 541f7aa5b..44b3b09c5 100644
--- a/doc/api_samples/all_extensions/servers-details-resp.xml
+++ b/doc/api_samples/all_extensions/servers-details-resp.xml
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <servers xmlns:OS-DCF="http://docs.openstack.org/compute/ext/disk_config/api/v1.1" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:OS-EXT-SRV-ATTR="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-IPS="http://docs.openstack.org/compute/ext/extended_ips/api/v1.1" xmlns:OS-EXT-STS="http://docs.openstack.org/compute/ext/extended_status/api/v1.1" xmlns:OS-EXT-AZ="http://docs.openstack.org/compute/ext/extended_availability_zone/api/v2" xmlns="http://docs.openstack.org/compute/api/v1.1">
-  <server status="ACTIVE" updated="2013-02-07T19:01:59Z" hostId="641edaad8dd6a670afec58a4ce7e908d50379a6060f845236cd063db" name="new-server-test" created="2013-02-07T19:01:58Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="b45edf9d-30f6-41e8-a00b-ef8962376586" key_name="None" config_drive="" OS-EXT-SRV-ATTR:vm_state="active" OS-EXT-SRV-ATTR:task_state="None" OS-EXT-SRV-ATTR:power_state="1" OS-EXT-SRV-ATTR:instance_name="instance-00000001" OS-EXT-SRV-ATTR:host="f7954cfa4a5544278876b1d9224efe48" OS-EXT-SRV-ATTR:hypervisor_hostname="fake-mini" OS-EXT-AZ:host_availability_zone="nova" OS-EXT-AZ:availability_zone="None" OS-DCF:diskConfig="AUTO">
+  <server status="ACTIVE" updated="2013-02-07T19:01:59Z" hostId="641edaad8dd6a670afec58a4ce7e908d50379a6060f845236cd063db" name="new-server-test" created="2013-02-07T19:01:58Z" userId="fake" tenantId="openstack" accessIPv4="" accessIPv6="" progress="0" id="b45edf9d-30f6-41e8-a00b-ef8962376586" key_name="None" config_drive="" OS-EXT-SRV-ATTR:vm_state="active" OS-EXT-SRV-ATTR:task_state="None" OS-EXT-SRV-ATTR:power_state="1" OS-EXT-SRV-ATTR:instance_name="instance-00000001" OS-EXT-SRV-ATTR:host="f7954cfa4a5544278876b1d9224efe48" OS-EXT-SRV-ATTR:hypervisor_hostname="fake-mini" OS-EXT-AZ:availability_zone="nova" OS-DCF:diskConfig="AUTO">
     <image id="70a599e0-31e7-49b7-b260-868f441e862b">
       <atom:link href="http://openstack.example.com/openstack/images/70a599e0-31e7-49b7-b260-868f441e862b" rel="bookmark"/>
     </image>
@@ -21,4 +21,4 @@
       <security_group name="default"/>
     </security_groups>
   </server>
-</servers>
\ No newline at end of file
+</servers>