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A wrapper for using nameko services with Flask

Project description

# flask_nameko

A wrapper for using nameko services with Flask

## Installation

Install it via PyPI:

pip install flask_nameko

## Usage

To start using `flask_nameko`, you need to create and configure a new `FlaskPooledClusterRpcProxy` singleton, which you'll use to communicate with your Nameko cluster.

# __init__.py
from flask import Flask
from flask_nameko import FlaskPooledClusterRpcProxy

rpc = FlaskPooledClusterRpcProxy()

def create_app():
app = Flask(__name__)
app.config.update(dict(
NAMEKO_AMQP_URI='amqp://localhost'
))

rpc.init_app(app)

app = create_app()

Then, you can use the `FlaskPooledClusterRpcProxy` singleton just as you would normally use a `ClusterRpcProxy`, by accessing individual services by name and calling methods on them:

# routes.py

from . import (
app,
rpc
)

@app.route('/'):
def index():
result = rpc.service.do_something('test')
return result

## API

### Configuration

`FlaskPooledClusterRpcProxy` accepts all nameko configuration values, prefixed with the `NAMEKO_` prefix. In addition, it exposes additional configuration options:

* `NAMEKO_INITIAL_CONNECTIONS (int, default=2)` - the number of initial connections to the Nameko cluster to create
* `NAMEKO_MAX_CONNECTIONS (int, default=8)` - the max number of connections to the Nameko cluster to create before raises an error
* `NAMEKO_CONNECT_ON_METHOD_CALL (bool, default=True)` - whether connections to services should be loaded when the service is accessed (False) or when a method is called on a service (True)
* `NAMEKO_RPC_TIMEOUT` (int, default=None) - the default timeout before raising an error when trying to call a service RPC method
* `NAMEKO_POOL_RECYCLE` (int, default=None) - if specified, connections that are older than this interval, specified in seconds, will be automatically recycled on checkout. This setting is useful for environments where connections are happening through a proxy like HAProxy which automatically closes connections after a specified interval.

### Proxies

*flask_nameko.**FlaskPooledClusterRpcProxy**(app=None, connect_on_method_call=True)*

This class is used to create a pool of connections to a Nameko cluster. It provides the following options:

* `connect_on_method_call` - if this is true, the connection to a service is created when a method is called on a service rather than when the service is accessed

*init_app(app=None)*

Configure the proxy for a given app.

## Development

$ git clone git@github.com:jessepollak/flask_nameko.git flask_nameko
$ cd flask_nameko
$ make develop


=======
History
=======

`1.4.0 <https://github.com/clef/flask-nameko/compare/v1.3.0...v1.4.0>`__ (2017-09-10)
-------------------------------------------------------------------------------------

Features
~~~~~~~~~~~~~

- **Python**: Python 3 support + fix pep8 voilations
(`69d116 <https://github.com/jessepollak/flask-nameko/commit/69d116>`__)

`1.3.0 <https://github.com/clef/flask-nameko/compare/v1.2.0...v1.3.0>`__ (2016-09-20)
-------------------------------------------------------------------------------------

Documentation
~~~~~~~~~~~~~

- **README**: adds docs for NAMEKO\_POOL\_RECYCLE
(`a27a1be <https://github.com/clef/flask-nameko/commit/a27a1be>`__)

Features
~~~~~~~~

- **ConnectionPool**: add pool recycling to eliminate closed connection
issue
(`4d90f1d <https://github.com/clef/flask-nameko/commit/4d90f1d>`__)

`1.2.0 <https://github.com/clef/flask-nameko/compare/v1.1.1...v1.2.0>`__ (2016-09-16)
-------------------------------------------------------------------------------------

Features
~~~~~~~~

- **PooledClusterRpcProxy**: add support for NAMEKO\_RPC\_TIMEOUT
setting
(`d4d6042 <https://github.com/clef/flask-nameko/commit/d4d6042>`__)

`1.1.0 <https://github.com/clef/flask-nameko/compare/v1.0.1...v1.1.0>`__ (2016-08-09)
-------------------------------------------------------------------------------------

Features
~~~~~~~~

- **FlaskPooledClusterRpcProxy**: add lazy\_load\_services config
(`26184f6 <https://github.com/clef/flask-nameko/commit/26184f6>`__)

`0.1.0 <https://github.com/clef/flask-nameko/compare/89698bba0ece0781f931b006009d3b3468e7883a...v0.1.0>`__ (2016-07-28)
-----------------------------------------------------------------------------------------------------------------------

Features
~~~~~~~~

- **flask\_nameko**: adds FlaskPooledClusterRpcProxy
(`285df05 <https://github.com/clef/flask-nameko/commit/285df05>`__)

0.1.0
------------------

* First release on PyPI.

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