base

Documentation

Overview

Package base defines a balancer base that can be used to build balancers with different picking algorithms.

The base balancer creates a new SubConn for each resolved address. The provided picker will only be notified about READY SubConns.

This package is the base of round_robin balancer, its purpose is to be used to build round_robin like balancers with complex picking algorithms. Balancers with more complicated logic should try to implement a balancer builder from scratch.

All APIs in this package are experimental.

Index

• func NewBalancerBuilder(name string, pb PickerBuilder) balancer.Builder
• func NewBalancerBuilderWithConfig(name string, pb PickerBuilder, config Config) balancer.Builder
• func NewErrPicker(err error) balancer.Picker
• type Config
• type PickerBuilder

Functions

func NewBalancerBuilder

func NewBalancerBuilder(name string, pb PickerBuilder) balancer.Builder

NewBalancerBuilder returns a balancer builder. The balancers built by this builder will use the picker builder to build pickers.

func NewBalancerBuilderWithConfig

func NewBalancerBuilderWithConfig(name string, pb PickerBuilder, config Config) balancer.Builder

NewBalancerBuilderWithConfig returns a base balancer builder configured by the provided config.

func NewErrPicker

func NewErrPicker(err error) balancer.Picker

NewErrPicker returns a picker that always returns err on Pick().

Types

type Config

type Config struct {
	// HealthCheck indicates whether health checking should be enabled for this specific balancer.
	HealthCheck bool
}

Config contains the config info about the base balancer builder.

type PickerBuilder

type PickerBuilder interface {
	// Build takes a slice of ready SubConns, and returns a picker that will be
	// used by gRPC to pick a SubConn.
	Build(readySCs map[resolver.Address]balancer.SubConn) balancer.Picker
}

PickerBuilder creates balancer.Picker.