[v2] Implement conditional prompt_toolkit importing

.changes/next-release/enhancement-Performance-97002.json

@@ -0,0 +1,5 @@
+{
+  "type": "enhancement",
+  "category": "Performance",
+  "description": "Defer some imports (e.g. ``prompt_toolkit``) until they are needed to reduce command initialization time (e.g. loading all imported modules)."
+}

awscli/autoprompt/core.py

@@ -10,20 +10,13 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
-from botocore.exceptions import ProfileNotFound
-
 from awscli.autocomplete.filters import fuzzy_filter
 from awscli.autocomplete.main import create_autocompleter
 from awscli.autoprompt.prompttoolkit import PromptToolkitPrompter
-from awscli.customizations.exceptions import ParamValidationError
 from awscli.errorhandler import SilenceParamValidationMsgErrorHandler
 
 
 class AutoPromptDriver:
-    _NO_PROMPT_ARGS = ['help', '--version']
-    _CLI_AUTO_PROMPT_OPTION = '--cli-auto-prompt'
-    _NO_CLI_AUTO_PROMPT_OPTION = '--no-cli-auto-prompt'
-
     def __init__(self, driver, completion_source=None, prompter=None):
         self._completion_source = completion_source
         self._prompter = prompter
@@ -42,34 +35,6 @@ def prompter(self):
             )
         return self._prompter
 
-    def validate_auto_prompt_args_are_mutually_exclusive(self, args):
-        no_cli_auto_prompt = self._NO_CLI_AUTO_PROMPT_OPTION in args
-        cli_auto_prompt = self._CLI_AUTO_PROMPT_OPTION in args
-        if cli_auto_prompt and no_cli_auto_prompt:
-            raise ParamValidationError(
-                'Both --cli-auto-prompt and --no-cli-auto-prompt cannot be '
-                'specified at the same time.'
-            )
-
-    def resolve_mode(self, args):
-        # Order of precedence to check:
-        # - check if any arg rom NO_PROMPT_ARGS in args
-        # - check if '--no-cli-auto-prompt' was specified
-        # - check if '--cli-auto-prompt' was specified
-        # - check configuration chain
-        self.validate_auto_prompt_args_are_mutually_exclusive(args)
-        if any(arg in args for arg in self._NO_PROMPT_ARGS):
-            return 'off'
-        if self._NO_CLI_AUTO_PROMPT_OPTION in args:
-            return 'off'
-        if self._CLI_AUTO_PROMPT_OPTION in args:
-            return 'on'
-        try:
-            config = self._session.get_config_variable('cli_auto_prompt')
-            return config.lower()
-        except ProfileNotFound:
-            return 'off'
-
     def inject_silence_param_error_msg_handler(self, driver):
         driver.error_handler.inject_handler(
             0, SilenceParamValidationMsgErrorHandler()

awscli/autoprompt/exceptions.py

@@ -0,0 +1,14 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+#     http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+class PrompterKeyboardInterrupt(KeyboardInterrupt):
+    pass

awscli/autoprompt/factory.py

@@ -28,6 +28,7 @@
 from prompt_toolkit.layout.processors import BeforeInput
 from prompt_toolkit.widgets import SearchToolbar, VerticalLine
 
+from awscli.autoprompt.exceptions import PrompterKeyboardInterrupt
 from awscli.autoprompt.filters import (
     doc_section_visible,
     doc_window_has_focus,
@@ -46,10 +47,6 @@
 )
 
 
-class PrompterKeyboardInterrupt(KeyboardInterrupt):
-    pass
-
-
 class CLIPromptBuffer(Buffer):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)

awscli/clidriver.py

@@ -30,6 +30,7 @@
     ScopedConfigProvider,
 )
 from botocore.context import start_as_current_context
+from botocore.exceptions import ProfileNotFound
 from botocore.history import get_global_history_recorder
 
 from awscli import __version__
@@ -49,7 +50,6 @@
     ListArgument,
     UnknownArgumentError,
 )
-from awscli.autoprompt.core import AutoPromptDriver
 from awscli.commands import CLICommand
 from awscli.compat import (
     default_pager,
@@ -58,6 +58,7 @@
     validate_preferred_output_encoding,
 )
 from awscli.constants import PARAM_VALIDATION_ERROR_RC
+from awscli.customizations.exceptions import ParamValidationError
 from awscli.errorhandler import (
     construct_cli_error_handlers_chain,
     construct_entry_point_handlers_chain,
@@ -90,6 +91,9 @@
 )
 HISTORY_RECORDER = get_global_history_recorder()
 METADATA_FILENAME = 'metadata.json'
+_NO_AUTO_PROMPT_ARGS = ['help', '--version']
+_CLI_AUTO_PROMPT_OPTION = '--cli-auto-prompt'
+_NO_CLI_AUTO_PROMPT_OPTION = '--no-cli-auto-prompt'
 # Don't remove this line.  The idna encoding
 # is used by getaddrinfo when dealing with unicode hostnames,
 # and in some cases, there appears to be a race condition
@@ -126,6 +130,36 @@ def create_clidriver(args=None):
     return driver
 
 
+def validate_auto_prompt_args_are_mutually_exclusive(args):
+    no_cli_auto_prompt = _NO_CLI_AUTO_PROMPT_OPTION in args
+    cli_auto_prompt = _CLI_AUTO_PROMPT_OPTION in args
+    if cli_auto_prompt and no_cli_auto_prompt:
+        raise ParamValidationError(
+            'Both --cli-auto-prompt and --no-cli-auto-prompt cannot be '
+            'specified at the same time.'
+        )
+
+
+def resolve_auto_prompt_mode(args, session):
+    # Order of precedence to check:
+    # - check if any arg from _NO_AUTO_PROMPT_ARGS in args
+    # - check if '--no-cli-auto-prompt' was specified
+    # - check if '--cli-auto-prompt' was specified
+    # - check configuration chain
+    validate_auto_prompt_args_are_mutually_exclusive(args)
+    if any(arg in args for arg in _NO_AUTO_PROMPT_ARGS):
+        return 'off'
+    if _NO_CLI_AUTO_PROMPT_OPTION in args:
+        return 'off'
+    if _CLI_AUTO_PROMPT_OPTION in args:
+        return 'on'
+    try:
+        config = session.get_config_variable('cli_auto_prompt')
+        return config.lower()
+    except ProfileNotFound:
+        return 'off'
+
+
 def _get_distribution_source():
     metadata_file = os.path.join(
         os.path.join(os.path.dirname(os.path.abspath(__file__)), 'data'),
@@ -220,12 +254,17 @@ def _do_main(self, args):
         driver = self._driver
         if driver is None:
             driver = create_clidriver(args)
-        autoprompt_driver = AutoPromptDriver(driver)
-        auto_prompt_mode = autoprompt_driver.resolve_mode(args)
+        auto_prompt_mode = resolve_auto_prompt_mode(args, driver.session)
         if auto_prompt_mode == 'on':
+            from awscli.autoprompt.core import AutoPromptDriver
+
+            autoprompt_driver = AutoPromptDriver(driver)
             args = autoprompt_driver.prompt_for_args(args)
             rc = self._run_driver(driver, args, prompt_mode='on')
         elif auto_prompt_mode == 'on-partial':
+            from awscli.autoprompt.core import AutoPromptDriver
+
+            autoprompt_driver = AutoPromptDriver(driver)
             autoprompt_driver.inject_silence_param_error_msg_handler(driver)
             rc = self._run_driver(driver, args, prompt_mode='off')
             if rc == PARAM_VALIDATION_ERROR_RC:

awscli/customizations/configure/configure.py

@@ -28,7 +28,7 @@
 from awscli.customizations.configure.listprofiles import ListProfilesCommand
 from awscli.customizations.configure.mfalogin import ConfigureMFALoginCommand
 from awscli.customizations.configure.set import ConfigureSetCommand
-from awscli.customizations.configure.sso import (
+from awscli.customizations.configure.sso_commands import (
     ConfigureSSOCommand,
     ConfigureSSOSessionCommand,
 )