micro/selector/roundrobin/round_robin_selector.go

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package roundrobin
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import (
"sync"
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"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/selector"
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)
type roundRobinSelector struct {
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so selector.Options
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}
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func (r *roundRobinSelector) Init(opts ...selector.Option) error {
for _, o := range opts {
o(&r.so)
}
return nil
}
func (r *roundRobinSelector) Options() selector.Options {
return r.so
}
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func (r *roundRobinSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
var sopts selector.SelectOptions
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for _, opt := range opts {
opt(&sopts)
}
// get the service
services, err := r.so.Registry.GetService(service)
if err != nil {
return nil, err
}
// apply the filters
for _, filter := range sopts.Filters {
services = filter(services)
}
// if there's nothing left, return
if len(services) == 0 {
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return nil, selector.ErrNotFound
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}
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var nodes []*registry.Node
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for _, service := range services {
for _, node := range service.Nodes {
nodes = append(nodes, node)
}
}
if len(nodes) == 0 {
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return nil, selector.ErrNotFound
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}
var i int
var mtx sync.Mutex
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return func() (*registry.Node, error) {
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mtx.Lock()
defer mtx.Unlock()
i++
return nodes[i%len(nodes)], nil
}, nil
}
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func (r *roundRobinSelector) Mark(service string, node *registry.Node, err error) {
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return
}
func (r *roundRobinSelector) Reset(service string) {
return
}
func (r *roundRobinSelector) Close() error {
return nil
}
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func (r *roundRobinSelector) String() string {
return "roundrobin"
}
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func NewSelector(opts ...selector.Option) selector.Selector {
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var sopts selector.Options
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for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
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sopts.Registry = registry.DefaultRegistry
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}
return &roundRobinSelector{sopts}
}