You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.2 KiB
59 lines
1.2 KiB
package random
|
|
|
|
import (
|
|
"context"
|
|
"math/rand"
|
|
|
|
"github.com/go-kratos/kratos/v2/selector"
|
|
"github.com/go-kratos/kratos/v2/selector/node/direct"
|
|
)
|
|
|
|
const (
|
|
// Name is random balancer name
|
|
Name = "random"
|
|
)
|
|
|
|
var _ selector.Balancer = &Balancer{} // Name is balancer name
|
|
|
|
// WithFilter with select filters
|
|
func WithFilter(filters ...selector.Filter) Option {
|
|
return func(o *options) {
|
|
o.filters = filters
|
|
}
|
|
}
|
|
|
|
// Option is random builder option.
|
|
type Option func(o *options)
|
|
|
|
// options is random builder options
|
|
type options struct {
|
|
filters []selector.Filter
|
|
}
|
|
|
|
// Balancer is a random balancer.
|
|
type Balancer struct{}
|
|
|
|
// New random a selector.
|
|
func New(opts ...Option) selector.Selector {
|
|
var option options
|
|
for _, opt := range opts {
|
|
opt(&option)
|
|
}
|
|
|
|
return &selector.Default{
|
|
Balancer: &Balancer{},
|
|
NodeBuilder: &direct.Builder{},
|
|
Filters: option.filters,
|
|
}
|
|
}
|
|
|
|
// Pick pick a weighted node.
|
|
func (p *Balancer) Pick(_ context.Context, nodes []selector.WeightedNode) (selector.WeightedNode, selector.DoneFunc, error) {
|
|
if len(nodes) == 0 {
|
|
return nil, nil, selector.ErrNoAvailable
|
|
}
|
|
cur := rand.Intn(len(nodes))
|
|
selected := nodes[cur]
|
|
d := selected.Pick()
|
|
return selected, d, nil
|
|
}
|
|
|