Hanging heat-api after validate request

[Sergey Kraynev]

For juno release Heat has requirement:

requests>=1.2.1,!=2.4.0

In case when you use requests>=1.2.1, <=2.0.1, with Devstack installation on Centos 6.5 you can got situation with hanging heat-api process.
It will be still available, but can not handle any new request. How to reproduce:
 - install devstack of juno release on Centos 6.5
 - manually downgrade requests lib to one value of range (1.2.1 - 2.0.1)
 - restart heat-api
 - start tempest test [1] or do the same manually:
     * get token_id and tenant_id from json response:
        curl -d '{"auth":{"passwordCredentials":{"username": "admin", "password": "admin"},"tenantName": "demo"}}' -H "Content-Type: application/json" http://localhost:5000/v2.0/tokens
     * try to validate template with wrong url:
       curl -iv http://localhost:8004/v1/<TENANT_ID>/validate -H "X-Auth-Token: <TOKEN_ID>" -H "Content-Type: application/json" -d '{"template_url": "http://www.example.com/template.template", "parameters":{}}'

As result you will get hanging heat-api:

[skr@localhost devstack]$ curl -iv http://localhost:8004/v1/37997a474b8745768b19f8c11946a3b5/validate -H "X-Auth-Token: 069915cc53ee4cdf863f5735a5e433de" -H "Content-Type: application/json" -d '{"template_url": "http://www.example.com/template.template", "parameters":{}}'

* About to connect() to localhost port 8004 (#0)
* Trying ::1... Connection refused
* Trying 127.0.0.1... connected
* Connected to localhost (127.0.0.1) port 8004 (#0)
> POST /v1/37997a474b8745768b19f8c11946a3b5/validate HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.16.2.3 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: localhost:8004
> Accept: */*
> X-Auth-Token: 069915cc53ee4cdf863f5735a5e433de
> Content-Type: application/json
> Content-Length: 77
>

Log from heat-api:

Exception AttributeError: "'GreenSocket' object has no attribute 'fd'" in <bound method GreenSocket.__del__ of <eventlet.greenio.GreenSocket object at 0x536a710>> ignored
Exception RuntimeError: 'maximum recursion depth exceeded in __subclasscheck__' in <type 'exceptions.AttributeError'> ignored
Exception AttributeError: "'GreenSocket' object has no attribute 'fd'" in <bound method GreenSocket.__del__ of <eventlet.greenio.GreenSocket object at 0x536a710>> ignored
^CException KeyboardInterrupt in <bound method GreenSocket.__del__ of <eventlet.greenio.GreenSocket object at 0x536a710>> ignored

[1] https://github.com/openstack/tempest/blob/477d63086eac246afed75904918d757ecc1762a4/tempest/api/orchestration/stacks/test_templates_negative.py

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/144433

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sergey Kraynev (<email address hidden>) on branch: stable/juno
Review: https://review.openstack.org/144433
Reason: Abandoned according to the previous message. (in favor of auto-sync from global requirements)

[Angus Salkeld (asalkeld)]

relevant review: https://review.openstack.org/#/c/159978/

[Steven Hardy (shardy)]

Affects Juno only, marking master bug invalid