micro/selector/default.go

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package selector
import (
"time"
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/registry/cache"
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)
type registrySelector struct {
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so Options
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rc cache.Cache
}
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func (c *registrySelector) newCache() cache.Cache {
ropts := []cache.Option{}
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if c.so.Context != nil {
if t, ok := c.so.Context.Value("selector_ttl").(time.Duration); ok {
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ropts = append(ropts, cache.WithTTL(t))
}
}
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return cache.New(c.so.Registry, ropts...)
}
func (c *registrySelector) Init(opts ...Option) error {
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for _, o := range opts {
o(&c.so)
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}
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c.rc.Stop()
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c.rc = c.newCache()
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return nil
}
func (c *registrySelector) Options() Options {
return c.so
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}
func (c *registrySelector) Select(service string, opts ...SelectOption) (Next, error) {
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sopts := SelectOptions{
Strategy: c.so.Strategy,
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}
for _, opt := range opts {
opt(&sopts)
}
// get the service
// try the cache first
// if that fails go directly to the registry
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services, err := c.rc.GetService(service)
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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 {
return nil, ErrNoneAvailable
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}
return sopts.Strategy(services), nil
}
func (c *registrySelector) Mark(service string, node *registry.Node, err error) {
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}
func (c *registrySelector) Reset(service string) {
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}
// Close stops the watcher and destroys the cache
func (c *registrySelector) Close() error {
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c.rc.Stop()
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return nil
}
func (c *registrySelector) String() string {
return "registry"
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}
func NewSelector(opts ...Option) Selector {
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sopts := Options{
Strategy: Random,
}
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
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s := &registrySelector{
so: sopts,
}
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s.rc = s.newCache()
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return s
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}