great-components

directory-components

Reusable components used across the GREAT platform for the Department for International Trade.

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Installation

pip install directory-components

Development

$ git clone https://github.com/uktrade/directory-components
$ cd directory-components
$ [create virtual environment and activate]
$ make install_requirements

To test cookies locally add this to your /etc/hosts:

127.0.0.1       components.trade.great

Then visit the demo at components.trade.great:9013

Commands

Command	Description
make clean	Delete pyc files
make pytest	Run all tests. Run pip install '.[test]' first
make pytest test_foo.py	Run all tests in file called test_foo.py
make pytest -- --last-failed`	Run the last tests to fail
make pytest -- -k foo	Run the test called foo
make pytest --	Run arbitrary pytest command
make flake8	Run linting
make manage	Run arbitrary management command
make webserver	Run the demo development web server. Run pip install '.[demo]' first
make requirements	Compile the requirements file
make install_requirements	Installed the compile requirements file
make css	Compile scss to css
make publish	Publish the package to PyPI

Features

Environment variables

Environment variable	Notes
FEATURE_MAINTENANCE_MODE_ENABLED	Controls MaintenanceModeMiddleware.
FEATURE_FLAGS	Place to store the service's feature flags.
DIRECTORY_COMPONENTS_VAULT_DOMAIN	Hashicorp vault domain. For diffing vaults.
DIRECTORY_COMPONENTS_VAULT_ROOT_PATH	Hashicorp vault root path. For diffing vaults.
DIRECTORY_COMPONENTS_VAULT_PROJECT	Hashicorp vault project. For diffing vaults.
DIRECTORY_COMPONENTS_VAULT_IGNORE_SETTINGS_REGEX	Settings to ignore when diffing vaults.

Middleware

Middleware can be found in great_components.middleware.FooBar.

Middleware	Notes
MaintenanceModeMiddleware	Redirects to http://sorry.great.gov.uk if FEATURE_MAINTENANCE_MODE_ENABLED is true.
NoCacheMiddlware	Prevents any page in the service from caching pages of logged in users.
PrefixUrlMiddleware	Redirects use from unprefixed url to prefixed url.

Context processors

Middleware can be found in great_components.context_processors.foo_bar.

Processor	Context variable name	Notes
sso_processor		Exposes the state of the SSO user.
analytics	great_components_analytics	GA details. Used by base template.
header_footer_processor	header_footer_urls	Urls used by base template's header and footer.
urls_processor	great_components_urls	More urls used by base template's header and footer.
feature_flags	feature_flags	Exposes the service's feature flags.

Exception handlers

Add the following to your urls.py for directory components templates to be used on 404 and 500

handler404 = 'great_components.views.handler404'

handler500 = 'great_components.views.handler500'

Without doing this the 500 and 400 pages would not receive context data provided by context processors

Settings janitor

Management commands are provided to assist in the maintenance of settings. Install by pip install directory-components[janitor] and then add the following to settings.py:

if some_predicate_is_met:  # feature flagged so it's not used in prod
    INSTALLED_APPS.append('great_components.janitor')

Diff vaults

You can diff the vaults of two environments by running the following.

manage.py vault_diff \
    --token=<token> \
    --domain=<domain> \
    --root=<root> \
    --project=<project> \
    --environment_a=<environment_a> \
    --environment_b=<environment_b>

For simplicity once you set the DIRECTORY_COMPONENTS_VAULT_DOMAIN, DIRECTORY_COMPONENTS_VAULT_PROJECT, and DIRECTORY_COMPONENTS_VAULT_ROOT_PATH that simplifies to

manage.py environment_diff \
    --token=<token> \
    --environment_a=<environment_a> \
    --environment_b=<environment_b>

Update vaults

You can batch update the vaults of all your environments by running the following

manage.py vault_update -- \
    --token=<token> \
    --domain=<domain> \
    --root=<root> \
    --mutator='path.to.function'

mutator is the path to a function relative to the project root. The call signature is secrets=dict, path=str. The return dict will be uploaded to vault.

For simplicity once you set the DIRECTORY_COMPONENTS_VAULT_DOMAIN, and DIRECTORY_COMPONENTS_VAULT_ROOT_PATH that simplifies to:

manage.py vault_update \
    --token=<token> \
    --mutator='path.to.function'

Detect settings orphans

You can detect settings that are either unused in the codebase, redundant because they're explicitly set to the default django value, or obsolete because they're set in the vault but not used anywhere:

manage.py settings_shake \
    --token=<token> \
    --root=<root> \
    --domain=<domain> \
    --project=<project> \
    --environment=<environment>

For simplicity once you set the DIRECTORY_COMPONENTS_VAULT_DOMAIN, DIRECTORY_COMPONENTS_VAULT_PROJECT, and DIRECTORY_COMPONENTS_VAULT_ROOT_PATH that simplifies to

manage.py settings_shake \
    --token=<token> \
    --environment=<environment>

Publish to PyPI

The package should be published to PyPI on merge to master. If you need to do it locally then get the credentials from rattic and add the environment variables to your host machine:

Setting
DIRECTORY_PYPI_USERNAME
DIRECTORY_PYPI_PASSWORD

Then run the following command:

make publish