Log request-id for each api call

Added support to log 'X-Openstack-Request-Id' for each api call.
If glanceclient is used from command line then following log will
be logged on console if --debug flag is used.

DEBUG:glanceclient.common.http:GET call to glance-api for
http://172.26.88.20:9292/v2/schemas/image used request id
req-e0c7c97a-8fc0-4ce3-a669-d0b1eb5d7aae

If python-glanceclient is used in applications (e.g. Nova) then
following log message will be logged in service logs.

DEBUG glanceclient.common.http
[req-be074f1e-1c17-4786-b703-2a221751c8f4 demo demo] GET call to
glance-api for
http://172.26.88.20:9292/v1/images/detail?is_public=none&limit=20
used request id req-9b1dd929-df30-46b2-a8f2-dfd6ffbad3fc

DocImpact:
To use this feature user need to set 'default_log_levels' in third
party application. For example nova uses glance then in nova.conf
'default_log_levels' should be set as below:

default_log_levels = glanceclient=DEBUG

Implements: blueprint log-request-id
Change-Id: Ib04a07bac41ad2a5e997348f3b0bccc640169dc9

glanceclient/common/http.py

@@ -120,6 +120,16 @@ class _BaseHTTPClient(object):
                 except ValueError:
                     body_iter = None
 
+        # log request-id for each api call
+        request_id = resp.headers.get('x-openstack-request-id')
+        if request_id:
+            LOG.debug('%(method)s call to glance-api for '
+                      '%(url)s used request id '
+                      '%(response_request_id)s',
+                      {'method': resp.request.method,
+                       'url': resp.url,
+                       'response_request_id': request_id})
+
         return resp, body_iter
 
 

releasenotes/notes/log-request-id-e7f67a23a0ed5c7b.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - Added support to log 'x-openstack-request-id' for each api call.
+    Please refer,
+    https://blueprints.launchpad.net/python-glanceclient/+spec/log-request-id
+    for more details.