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import "atomicgo.dev/robin"Package robin is a simple, generic and thread-safe round-robin load balancer for Go.
It can be used to load balance any type of data. It is not limited to HTTP requests.
Robin takes any slice as an input and returns the next item in the slice. When the end of the slice is reached, it starts again from the beginning.
Thread-safety is achieved by using atomic operations amd guarantees that two concurrent calls to Loadbalancer.Next will not return the same item, if the slice contains more than one item.
Benchmark:
BenchmarkLoadbalancer_Next 252151534 4.746 ns/op 0 B/op 0 allocs/op
BenchmarkLoadbalancer_Next-2 254281032 4.758 ns/op 0 B/op 0 allocs/op
BenchmarkLoadbalancer_Next-4 253424396 4.738 ns/op 0 B/op 0 allocs/op
BenchmarkLoadbalancer_Next-8 254842484 4.752 ns/op 0 B/op 0 allocs/op
BenchmarkLoadbalancer_Next-16 247016046 4.785 ns/op 0 B/op 0 allocs/op
BenchmarkLoadbalancer_Next-32 250539441 4.774 ns/op 0 B/op 0 allocs/op
type Loadbalancer
Loadbalancer is a simple, generic and thread-safe round-robin load balancer for Go.
type Loadbalancer[T any] struct {
Items []T
// contains filtered or unexported fields
}Example (Demo)
package main
import (
"atomicgo.dev/robin"
"fmt"
)
type Person struct {
Name string
}
func main() {
people := []Person{
{Name: "person1"},
{Name: "person2"},
{Name: "person3"},
{Name: "person4"},
{Name: "person5"},
}
lb := robin.NewLoadbalancer(people)
for i := 0; i < 10; i++ {
fmt.Println(lb.Next().Name)
}
}person1
person2
person3
person4
person5
person1
person2
person3
person4
person5
func NewLoadbalancer
func NewLoadbalancer[T any](items []T) *Loadbalancer[T]NewLoadbalancer creates a new Loadbalancer. It is guaranteed that two concurrent calls to Loadbalancer.Next will not return the same item, if the slice contains more than one item.
Example
package main
import (
"atomicgo.dev/robin"
"fmt"
)
func main() {
set := []string{"object1", "object2", "object3"}
lb := robin.NewLoadbalancer(set)
fmt.Println(lb.Current())
}object1
func (*Loadbalancer[T]) AddItems
func (l *Loadbalancer[T]) AddItems(items ...T)AddItems adds items to the Loadbalancer.
Example
package main
import (
"atomicgo.dev/robin"
"fmt"
)
func main() {
set := []int{1, 2, 3}
lb := robin.NewLoadbalancer(set)
lb.AddItems(4, 5, 6)
fmt.Println(lb.Items)
}[1 2 3 4 5 6]
func (*Loadbalancer[T]) Current
func (l *Loadbalancer[T]) Current() TCurrent returns the current item in the slice, without advancing the Loadbalancer.
Example
package main
import (
"atomicgo.dev/robin"
"fmt"
)
func main() {
set := []int{1, 2, 3}
lb := robin.NewLoadbalancer(set)
fmt.Println(lb.Current())
}1
func (*Loadbalancer[T]) Next
func (l *Loadbalancer[T]) Next() TNext returns the next item in the slice. When the end of the slice is reached, it starts again from the beginning.
Example
package main
import (
"atomicgo.dev/robin"
"fmt"
)
func main() {
set := []int{1, 2, 3}
lb := robin.NewLoadbalancer(set)
for i := 0; i < 10; i++ {
fmt.Println(lb.Next())
}
}1
2
3
1
2
3
1
2
3
1
func (*Loadbalancer[T]) Reset
func (l *Loadbalancer[T]) Reset()Reset resets the Loadbalancer to its initial state.
Example
package main
import (
"atomicgo.dev/robin"
"fmt"
)
func main() {
set := []int{1, 2, 3, 4, 5, 6}
lb := robin.NewLoadbalancer(set)
lb.Next()
lb.Next()
lb.Next()
lb.Reset()
fmt.Println(lb.Current())
}1
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