57 lines
1.0 KiB
Go
57 lines
1.0 KiB
Go
package selector
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import (
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"math/rand"
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"sync"
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"time"
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"github.com/micro/go-micro/registry"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// Random is a random strategy algorithm for node selection
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func Random(services []*registry.Service) Next {
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nodes := make([]*registry.Node, 0, len(services))
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for _, service := range services {
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nodes = append(nodes, service.Nodes...)
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}
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return func() (*registry.Node, error) {
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if len(nodes) == 0 {
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return nil, ErrNoneAvailable
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}
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i := rand.Int() % len(nodes)
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return nodes[i], nil
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}
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}
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// RoundRobin is a roundrobin strategy algorithm for node selection
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func RoundRobin(services []*registry.Service) Next {
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nodes := make([]*registry.Node, 0, len(services))
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for _, service := range services {
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nodes = append(nodes, service.Nodes...)
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}
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var i = rand.Int()
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var mtx sync.Mutex
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return func() (*registry.Node, error) {
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if len(nodes) == 0 {
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return nil, ErrNoneAvailable
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}
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mtx.Lock()
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node := nodes[i%len(nodes)]
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i++
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mtx.Unlock()
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return node, nil
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}
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}
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