config-client 0.5.0

config service client

config-client

config-client package for spring cloud config.

Installing

Install and update using pip:

pip install -U config-client

Dependencies

• attrs
• glom
• requests

Setup

The default URL pattern is:

• CONFIGSERVER_ADDRESS/BRANCH/APP_NAME-PROFILE.json

# expected environment variables:
#
CONFIGSERVER_ADDRESS=http://localhost:8888
BRANCH=master
PROFILE=development
APP_NAME=myapp

will result in:

http://localhost:8888/master/myapp-development.json

The url pattern can be customize on constructor with parameter url.

from config import spring

c = spring.ConfigClient(
        app_name='myapp',
        url="{address}/{branch}/{profile}-{app_name}.json"
    )
c.url
# output: 'http://localhost:8888/master/development-myapp.json'

Default values

if no value was adjusted for the environment variables below, the default value will be assumed, as:

CONFIGSERVER_ADDRESS=http://localhost:8888
BRANCH=master
PROFILE=development
APP_NAME=

Supported response format

• JSON

Just add the .json extension to the end of the URL parameter. For example:

c = ConfigClient(
    app_name='foo',
    profile='development',
    address='http://localhost:8000',
    branch='master',
    url='{address}/{branch}/{app_name}-{profile}.json' # <
)

It will result in URL: http://localhost:8000/master/foo-development.json .

Notice .yaml it's not supported, all extensions will be converted to .json internally.

Usage Example

using standard client

from config.spring import ConfigClient

config_client = ConfigClient(app_name='my_app')
config_client.get_config()

# option 1: dict like with direct access
config_client.config['spring']['cloud']['consul']['host']

# option 2: dict like using get
config_client.config.get('spring').get('cloud').get('consul').get('port')

# option 3: using get_attribute method
config_client.get_attribute('spring.cloud.consul.port')

standard client with @decorator

For use cases where environment variables are set.

from config import spring

@spring.config_client()
def my_test(config_client=None):
    config_client.config['spring']['cloud']['consul']['host']
    config_client.config.get('spring').get('cloud').get('consul').get('port')
    config_client.get_attribute('spring.cloud.consul.port')

For use cases where environment variables are not set can you use decorator parameters, as example below:

from config import spring

@spring.config_client(app_name='myapp', branch="dev")
def my_test(config_client=None):
    config_client.config['spring']['cloud']['consul']['host']
    config_client.config.get('spring').get('cloud').get('consul').get('port')
    config_client.get_attribute('spring.cloud.consul.port')

Integration with Flask.

from config.spring import ConfigClient
from flask import Flask


config_client = ConfigClient(app_name="myapp")
config_client.get_config()
app = Flask(__name__)
app.run(host='0.0.0.0',
        port=config_client.config.get('app').get('port')

using asyncio

client using asyncio

import asyncio
from config.spring import ConfigClient


loop = asyncio.get_event_loop()
config_client = ConfigClient(app_name='myapp')
config_client.get_config()

async def service_discovery():
    await discovery_client.register(
        config_client.config['app']['name'],
        config_client.config.get('app').get('port')
    )

discovery_client = Consul(
    config_client.config.get('spring').get('cloud').get('consul').get('host'),
    config_client.get_attribute('spring.cloud.consul.port'],
    loop
)
loop.run_until_complete(service_discovery)

create singleton instance

Assuming default values.

from config.spring import create_config_client


c = create_config_client()
d = create_config_client()

print(id(c))
print(id(d))

With custom values.

from config.spring import create_config_client


c = create_config_client(address='http://localhost:8888/configuration', app_name='autosprocessuais-pecas-txtos', branch="ft-sdintegracoes-591")
d = create_config_client(address='http://localhost:8888/configuration', app_name='autosprocessuais-pecas-txtos', branch="ft-sdintegracoes-591")

print(id(c))
print(id(d))

cloudfoundry integration

Default usage

from config.cf import CF

cf = CF()
cf.get_config()

It's necessary bind Config Server with the application first.

A example application it's available on:

• https://github.com/amenezes/simpleweb

Custom usage

from config.cf import CF
from config.spring import ConfigClient

cf = CF(client=ConfigClient(app_name='simpleweb000', url="{address}/{branch}/{app_name}.json"))
cf.get_config()

Development

Running Tests

Install development dependencies.

pip install -r requirements-dev.txt

To execute tests just run:

python -m pytest -v --cov-report term --cov=config tests

Links

• License: Apache License
• Code: https://github.com/amenezes/config-client
• Issue tracker: https://github.com/amenezes/config-client/issues