Enable OSProfiler support in Ironic

This patch does the following:
* Adds osprofiler wsgi middleware
  This middleware is used for 2 things:
  - It checks that person who wants to trace is trusted and knows
    secret HMAC key.
  - It starts tracing in case of proper trace headers
    and adds first wsgi trace point, with info about HTTP request.

* Adds initialization of osprofiler at start of service
  - Initialize and set an oslo.messaging based notifier instance
    to osprofiler, which will be used to send notifications to Ceilometer.

* Traces HTTP/RPC/DB API calls and SQL requests

NOTE to test this patch:
1) Make the following changes in localrc to configure DevStack to enable
   OSProfiler:

   enable_plugin panko https://git.openstack.org/openstack/panko
   enable_plugin ceilometer https://git.openstack.org/openstack/ceilometer
   enable_plugin osprofiler https://git.openstack.org/openstack/osprofiler

   # Enable the following services
   CEILOMETER_NOTIFICATION_TOPICS=notifications,profiler
   ENABLED_SERVICES+=,ceilometer-acompute,ceilometer-acentral
   ENABLED_SERVICES+=,ceilometer-anotification,ceilometer-collector
   ENABLED_SERVICES+=,ceilometer-alarm-evaluator,ceilometer-alarm-notifier
   ENABLED_SERVICES+=,ceilometer-api

NOTE: the order of enabling plugins matters.

2) Run stack.sh. Once DevStack environment is setup, enable profiler options
   in ironic.conf and restart ironic services:
   [profiler]
   enabled = true
   hmac_keys = SECRET_KEY
   trace_sqlalchemy = true

3) Use openstackclient and run baremetal command with
   --os-profile SECRET_KEY
   [--profile can be used, but it is deprecated.]
   For example, the following will cause the <trace-id> to be printed
   after node list:

   $ openstack --os-profile SECRET_KEY baremetal node list
   .....
   .....
   Trace ID: <trace-id>
   Display trace with command:
   osprofiler trace show --html <trace-id>

4) The trace results can be saved using this command:

   $ osprofiler trace show --html <trace-id> --out trace.html

OSprofiler spec: https://review.openstack.org/#/c/103825/

Co-Authored-By: Tovin Seven <vinhnt@vn.fujitsu.com>
Co-Authored-By: Hieu LE <hieulq@vn.fujitsu.com>

Partial-Bug: #1560704

Change-Id: Icd3d7c62cf7442de8a77fc67f119ae9b03725f02

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/config/ironic-config-generator.conf b/tools/config/ironic-config-generator.conf
index 088c234bf..f738cc406 100644
--- a/tools/config/ironic-config-generator.conf
+++ b/tools/config/ironic-config-generator.conf
@@ -16,4 +16,5 @@ namespace = oslo.log
 namespace = oslo.service.service
 namespace = oslo.service.periodic_task
 namespace = oslo.service.sslutils
+namespace = osprofiler
 namespace = keystonemiddleware.auth_token