Add shell --profile option to trigger osprofiler from CLI

This will allow to trigger profiling of various services that
allow it currently and which APIs support is added to openstackclient.
Cinder and Glance have osprofiler support already, Nova and Keystone
are in progress.

To use this functionality osprofiler (and its storage backend) needs
to be installed in the environment. If so, you will be able to trigger
profiling via the following command, for example:

$ openstack --profile SECRET_KEY user list

At the end of output there will be message with <trace_id>, and
to plot nice HTML graphs the following command should be used:

$ osprofiler trace show <trace_id> --html --out result.html

Related Keystone change: https://review.openstack.org/#/c/103368/
Related Nova change: https://review.openstack.org/#/c/254703/

The similar change to the keystoneclient
(https://review.openstack.org/#/c/255308/) was abandoned as new
CLI extenstions are not more accepted to python-keystoneclient.

Change-Id: I3d6ac613e5da70619d0a4781e5d066fde073b407

openstackclient/shell.py

@@ -25,6 +25,7 @@ from cliff import app
 from cliff import command
 from cliff import complete
 from cliff import help
+from oslo_utils import importutils
 from oslo_utils import strutils
 
 import openstackclient
@@ -37,6 +38,8 @@ from openstackclient.common import utils
 
 from os_client_config import config as cloud_config
 
+osprofiler_profiler = importutils.try_import("osprofiler.profiler")
+
 
 DEFAULT_DOMAIN = 'default'
 
@@ -101,6 +104,8 @@ class OpenStackShell(app.App):
         self.client_manager = None
         self.command_options = None
 
+        self.do_profile = False
+
     def configure_logging(self):
         """Configure logging for the app."""
         self.log_configurator = logs.LogConfigurator(self.options)
@@ -125,6 +130,39 @@ class OpenStackShell(app.App):
         finally:
             self.log.info("END return value: %s", ret_val)
 
+    def init_profile(self):
+        self.do_profile = osprofiler_profiler and self.options.profile
+        if self.do_profile:
+            osprofiler_profiler.init(self.options.profile)
+
+    def close_profile(self):
+        if self.do_profile:
+            trace_id = osprofiler_profiler.get().get_base_id()
+
+            # NOTE(dbelova): let's use warning log level to see these messages
+            # printed. In fact we can define custom log level here with value
+            # bigger than most big default one (CRITICAL) or something like
+            # that (PROFILE = 60 for instance), but not sure we need it here.
+            self.log.warning("Trace ID: %s" % trace_id)
+            self.log.warning("To display trace use next command:\n"
+                             "osprofiler trace show --html %s " % trace_id)
+
+    def run_subcommand(self, argv):
+        self.init_profile()
+        try:
+            ret_value = super(OpenStackShell, self).run_subcommand(argv)
+        finally:
+            self.close_profile()
+        return ret_value
+
+    def interact(self):
+        self.init_profile()
+        try:
+            ret_value = super(OpenStackShell, self).run_subcommand()
+        finally:
+            self.close_profile()
+        return ret_value
+
     def build_option_parser(self, description, version):
         parser = super(OpenStackShell, self).build_option_parser(
             description,
@@ -190,6 +228,19 @@ class OpenStackShell(app.App):
             help="Print API call timing info",
         )
 
+        # osprofiler HMAC key argument
+        if osprofiler_profiler:
+            parser.add_argument('--profile',
+                                metavar='hmac-key',
+                                help='HMAC key to use for encrypting context '
+                                'data for performance profiling of operation. '
+                                'This key should be the value of one of the '
+                                'HMAC keys configured in osprofiler '
+                                'middleware in the projects user would like '
+                                'to profile. It needs to be specified in '
+                                'configuration files of the required '
+                                'projects.')
+
         return clientmanager.build_plugin_option_parser(parser)
 
     def initialize_app(self, argv):

openstackclient/tests/test_shell.py

@@ -109,6 +109,7 @@ global_options = {
     '--os-default-domain': (DEFAULT_DOMAIN_NAME, True, True),
     '--os-cacert': ('/dev/null', True, True),
     '--timing': (True, True, False),
+    '--profile': ('SECRET_KEY', True, False),
     '--os-interface': (DEFAULT_INTERFACE, True, True)
 }
 

test-requirements.txt

@@ -17,6 +17,7 @@ testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT
 WebOb>=1.2.3 # MIT
 tempest-lib>=0.14.0 # Apache-2.0
+osprofiler>=1.1.0 # Apache-2.0
 
 # Install these to generate sphinx autodocs
 python-barbicanclient>=3.3.0 # Apache-2.0