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[Bug 1592940] [NEW] Horizon makes duclicated and extra requests

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Public bug reported:

Horizon Liberty

User reports slowness of the dashboard for most of the tabs.
Investigation shows that Horizon makes duplicated requests when it is trying to request information related to the networking. It also waits for about 4 seconds right after the initial user's successfull authentication before it proceeds with the first API call.

Here is the log of Horizon representing the delay:

2016-06-15 18:24:16,385 113992 DEBUG openstack_auth.backend Beginning user authentication
2016-06-15 18:24:16,387 113992 DEBUG openstack_auth.plugin.password Attempting to authenticate for admin
2016-06-15 18:24:16,387 113992 DEBUG keystoneclient.auth.identity.v3.base Making authentication request to http://192.168.210.69:5000/v3/auth/tokens
2016-06-15 18:24:16,481 113992 DEBUG keystoneclient.session REQ: curl -g -i --insecure -X GET http://192.168.210.69:5000/v3/ -H "Accept: application/j
son" -H "User-Agent: python-keystoneclient"
2016-06-15 18:24:16,503 113992 DEBUG keystoneclient.session RESP: [200] content-length: 253 vary: X-Auth-Token server: Apache connection: close date: 
Wed, 15 Jun 2016 18:24:16 GMT content-type: application/json x-openstack-request-id: req-258d4e76-6500-414d-a565-0788dc0d4f90 
RESP BODY: {"version": {"status": "stable", "updated": "2015-03-30T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.o
penstack.identity-v3+json"}], "id": "v3.4", "links": [{"href": "http://192.168.210.69:5000/v3/";, "rel": "self"}]}}

2016-06-15 18:24:16,503 113992 DEBUG keystoneclient.session REQ: curl -g -i --insecure -X GET http://192.168.210.69:5000/v3/users/51e3873fe48f4948bef2
32865c7bc84f/projects -H "User-Agent: python-keystoneclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}561e3b22c0693b6ff8dfad099a2492d95ed
8e9c1"
2016-06-15 18:24:16,561 113992 DEBUG keystoneclient.session RESP: [200] content-length: 412 vary: X-Auth-Token server: Apache connection: close date: 
Wed, 15 Jun 2016 18:24:16 GMT content-type: application/json x-openstack-request-id: req-765b3844-feb3-40b9-a843-f5cc2341afde 
RESP BODY: {"links": {"self": "http://192.168.210.69:5000/v3/users/51e3873fe48f4948bef232865c7bc84f/projects";, "previous": null, "next": null}, "proje
cts": [{"is_domain": false, "description": "admin tenant", "links": {"self": "http://192.168.210.69:5000/v3/projects/49cdffc876ca4927af2ea7505ad27264";
}, "enabled": true, "id": "49cdffc876ca4927af2ea7505ad27264", "parent_id": null, "domain_id": "default", "name": "admin"}]}

2016-06-15 18:24:16,561 113992 DEBUG keystoneclient.auth.identity.v3.base Making authentication request to http://192.168.210.69:5000/v3/auth/tokens
2016-06-15 18:24:16,657 113992 DEBUG openstack_auth.backend Authentication completed.
2016-06-15 18:24:16,657 113992 INFO openstack_auth.forms Login successful for user "admin".
2016-06-15 18:24:20,167 113996 DEBUG neutronclient.client REQ: curl -i https://domain.com:9696/v2.0/extensions.json -X GET -H "User-Agent: pyt
hon-neutronclient" -H "X-Auth-Token: {SHA1}04486c34b57ca19787b77e6d5e6e9fad48914b67"

Last 2 rows represent the issue.

I'll attach parsed logs for each tab opening in order to show duplicated
requests.

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1592940

Title:
  Horizon makes duclicated and extra requests

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Horizon Liberty

  User reports slowness of the dashboard for most of the tabs.
  Investigation shows that Horizon makes duplicated requests when it is trying to request information related to the networking. It also waits for about 4 seconds right after the initial user's successfull authentication before it proceeds with the first API call.

  Here is the log of Horizon representing the delay:

  2016-06-15 18:24:16,385 113992 DEBUG openstack_auth.backend Beginning user authentication
  2016-06-15 18:24:16,387 113992 DEBUG openstack_auth.plugin.password Attempting to authenticate for admin
  2016-06-15 18:24:16,387 113992 DEBUG keystoneclient.auth.identity.v3.base Making authentication request to http://192.168.210.69:5000/v3/auth/tokens
  2016-06-15 18:24:16,481 113992 DEBUG keystoneclient.session REQ: curl -g -i --insecure -X GET http://192.168.210.69:5000/v3/ -H "Accept: application/j
  son" -H "User-Agent: python-keystoneclient"
  2016-06-15 18:24:16,503 113992 DEBUG keystoneclient.session RESP: [200] content-length: 253 vary: X-Auth-Token server: Apache connection: close date: 
  Wed, 15 Jun 2016 18:24:16 GMT content-type: application/json x-openstack-request-id: req-258d4e76-6500-414d-a565-0788dc0d4f90 
  RESP BODY: {"version": {"status": "stable", "updated": "2015-03-30T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.o
  penstack.identity-v3+json"}], "id": "v3.4", "links": [{"href": "http://192.168.210.69:5000/v3/";, "rel": "self"}]}}

  2016-06-15 18:24:16,503 113992 DEBUG keystoneclient.session REQ: curl -g -i --insecure -X GET http://192.168.210.69:5000/v3/users/51e3873fe48f4948bef2
  32865c7bc84f/projects -H "User-Agent: python-keystoneclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}561e3b22c0693b6ff8dfad099a2492d95ed
  8e9c1"
  2016-06-15 18:24:16,561 113992 DEBUG keystoneclient.session RESP: [200] content-length: 412 vary: X-Auth-Token server: Apache connection: close date: 
  Wed, 15 Jun 2016 18:24:16 GMT content-type: application/json x-openstack-request-id: req-765b3844-feb3-40b9-a843-f5cc2341afde 
  RESP BODY: {"links": {"self": "http://192.168.210.69:5000/v3/users/51e3873fe48f4948bef232865c7bc84f/projects";, "previous": null, "next": null}, "proje
  cts": [{"is_domain": false, "description": "admin tenant", "links": {"self": "http://192.168.210.69:5000/v3/projects/49cdffc876ca4927af2ea7505ad27264";
  }, "enabled": true, "id": "49cdffc876ca4927af2ea7505ad27264", "parent_id": null, "domain_id": "default", "name": "admin"}]}

  2016-06-15 18:24:16,561 113992 DEBUG keystoneclient.auth.identity.v3.base Making authentication request to http://192.168.210.69:5000/v3/auth/tokens
  2016-06-15 18:24:16,657 113992 DEBUG openstack_auth.backend Authentication completed.
  2016-06-15 18:24:16,657 113992 INFO openstack_auth.forms Login successful for user "admin".
  2016-06-15 18:24:20,167 113996 DEBUG neutronclient.client REQ: curl -i https://domain.com:9696/v2.0/extensions.json -X GET -H "User-Agent: pyt
  hon-neutronclient" -H "X-Auth-Token: {SHA1}04486c34b57ca19787b77e6d5e6e9fad48914b67"

  Last 2 rows represent the issue.

  I'll attach parsed logs for each tab opening in order to show
  duplicated requests.

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Follow ups

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