python-jolokia

This is a python client library for Jolokia.

Motivation

Jolokia provides a JMX to HTTP bridge, which opens up many possibilities for managing JMX-enabled applications outside conventional enterprise Java workflows. At present, backend libraries are only available for Java and Perl, and there's also a browser-side JavaScript library. While Python is generally more convenient for dealing with HTTP resources than Java or Perl, a client library for Jolokia is optimal.

JMX is not a platform-agnostic tech. This means that management applications for Java EE apps are almost always written in Java, which is unfortunate, as it prevents a more flexible, polyglot architecture. Enter Jolokia. By bridging JMX to HTTP, Jolokia brings Java application management into the broader world of the web, so that they can be orchestrated and managed by tools outside the stodgy, if stable, world of enterprise Java.

Goals

Create a Python client for Jolokia that makes JMX data available both through simple abstractions aimed at the non-Java developer as well as through a full-featured API that gives the seasoned Java developer the flexibility she craves.

Requirements

• Support all Python versions supported by Python maintainers (currently >=3.5)
• python-jolokia should be transparent to different versions of the Jolokia protocol.

Installation

For regular usage, the recommended (but not required) installation method is pipenv:

pipenv install jolokia

For hacking on python-jolokia, pipenv is required. Fork the repo, clone it, and install dev dependencies:

git clone https://github.com/<user|org>/python-jolokia.git
pipenv install --dev

Usage

For HTTP authentication you can pass a in username and password

from jolokia import JolokiaClient


jc = JolokiaClient('http://my-jolokia-enabled-server.com/jolokia', 'my_login', 'my_password')

To get a single attribute of an MBean:

from jolokia import JolokiaClient


jc = JolokiaClient('http://my-jolokia-enabled-server.com/jolokia')

resp = jc.get_attribute(mbean='java.lang:type=Memory', attribute='HeapMemoryUsage')

print(resp)

{
    'request': {
        'attribute': 'HeapMemoryUsage', 
        'mbean': 'java.lang:type=Memory', 
        'type': 'read'
    }, 
    'timestamp': 1496174821, 
    'value': {
        'used': 288902152, 
        'committed': 1310720000, 
        'max': 1310720000, 
        'init': 1367343104
    }, 
    'status': 200
}

Or to retrieve multiple attributes, pass a list as the attribute parameter:

resp = jc.get_attribute(
    mbean='java.lang:type=Memory', 
    attribute=['HeapMemoryUsage', 'NonHeapMemoryUsage']
)

print(resp)

{
    'request': {
        'type': 'read', 
        'attribute': ['HeapMemoryUsage', 'NonHeapMemoryUsage'], 
        'mbean': 'java.lang:type=Memory'
    }, 
    'value': {
        'NonHeapMemoryUsage': {
            'init': 2555904, 
            'max': 1593835520, 
            'used': 77620176, 
            'committed': 87556096
        }, 
        'HeapMemoryUsage': {
            'init': 1367343104, 
            'max': 1310720000, 
            'used': 367638816, 
            'committed': 1310720000
        }
    }, 
    'timestamp': 1496175578, 
    'status': 200
}

Setting attributes works the same way, except that the value parameter is also required:

resp = jc.set_attribute(
    mbean='java.lang:type=ClassLoading',
    attribute='Verbose',
    value=True
)

print(resp)

{
    'request': {
        'type': 'write', 
        'attribute': 'Verbose', 
        'mbean': 'java.lang:type=ClassLoading', 
        'value': True
    }, 
    'value': False, 
    'timestamp': 1496175995, 
    'status': 200
}

Note that the top-level value key in the response refers to the initial value, and we can run get_attribute to verify that the value is now set to our specified value:

resp = jc.get_attribute(mbean='java.lang:type=ClassLoading', attribute='Verbose')

print(resp)

{
    'request': {
        'type': 'read', 
        'attribute': 'Verbose', 
        'mbean': 'java.lang:type=ClassLoading'
    }, 
    'value': True, 
    'timestamp': 1496176091, 
    'status': 200
}

Contributing

Coming soon...