81 lines
1.3 KiB
Go
81 lines
1.3 KiB
Go
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package registry
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import (
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"sync"
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)
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type roundRobinSelector struct {
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so SelectorOptions
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}
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func (r *roundRobinSelector) Select(service string, opts ...SelectOption) (SelectNext, error) {
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var sopts SelectOptions
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for _, opt := range opts {
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opt(&sopts)
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}
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// get the service
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services, err := r.so.Registry.GetService(service)
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if err != nil {
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return nil, err
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}
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// apply the filters
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for _, filter := range sopts.Filters {
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services = filter(services)
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}
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// if there's nothing left, return
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if len(services) == 0 {
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return nil, ErrNotFound
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}
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var nodes []*Node
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for _, service := range services {
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for _, node := range service.Nodes {
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nodes = append(nodes, node)
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}
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}
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if len(nodes) == 0 {
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return nil, ErrNotFound
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}
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var i int
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var mtx sync.Mutex
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return func() (*Node, error) {
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mtx.Lock()
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defer mtx.Unlock()
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i++
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return nodes[i%len(nodes)], nil
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}, nil
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}
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func (r *roundRobinSelector) Mark(service string, node *Node, err error) {
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return
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}
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func (r *roundRobinSelector) Reset(service string) {
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return
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}
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func (r *roundRobinSelector) Close() error {
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return nil
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}
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func NewRoundRobinSelector(opts ...SelectorOption) Selector {
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var sopts SelectorOptions
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for _, opt := range opts {
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opt(&sopts)
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}
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if sopts.Registry == nil {
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sopts.Registry = DefaultRegistry
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}
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return &roundRobinSelector{sopts}
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}
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