pybalancer

pybalancer an simple load balancer for Python

Features

English

• a simple load balancer
• consistent Hash Load Balance using uhashring ketama hash function
• periodly health checks, remove failed instance and add when it recovers
• manually call remove_instance when it fails.

Installation

Using pip:

$ pip install pybalaner

Basic usage

pybalancer is very simple and efficient to use:

from pybalancer import LoadBalancer

# create a consistent hash ring of 3 nodes of weight 1
balancer = LoadBalancer(instances=['node1:port1', 'node2:port2', 'node3:port3'], interval=5)

# get the node name for the remote_addr key
target_instance = balancer.get_instance(remote_addr="host:port")

failed_times = 0
# call target_instance fails
if call(target_instance):
	failed_times += 1
	if failed_times > max_fails:
		balancer.remove_instance(target_instance)


alive_instances = balancer.get_alive_instances()
print(alive_instances)