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default.go
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default.go
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// Copyright 2020 lack
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package selector
import (
"time"
regpb "github.com/lack-io/vine/proto/registry"
"github.com/lack-io/vine/service/registry"
"github.com/lack-io/vine/service/registry/cache"
)
type registrySelector struct {
so Options
rc cache.Cache
}
func (c *registrySelector) newCache() cache.Cache {
ropts := []cache.Option{}
if c.so.Context != nil {
if t, ok := c.so.Context.Value("selector_ttl").(time.Duration); ok {
ropts = append(ropts, cache.WithTTL(t))
}
}
return cache.New(c.so.Registry, ropts...)
}
func (c *registrySelector) Init(opts ...Option) error {
for _, o := range opts {
o(&c.so)
}
c.rc.Stop()
c.rc = c.newCache()
return nil
}
func (c *registrySelector) Options() Options {
return c.so
}
func (c *registrySelector) Select(service string, opts ...SelectOption) (Next, error) {
sopts := SelectOptions{
Strategy: c.so.Strategy,
}
for _, opt := range opts {
opt(&sopts)
}
// get the service
// try the cache first
// if that fails go directly to the registry
services, err := c.rc.GetService(service)
if err != nil {
if err == registry.ErrNotFound {
return nil, ErrNotFound
}
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
}
return sopts.Strategy(services), nil
}
func (c *registrySelector) Mark(service string, node *regpb.Node, err error) {}
func (c *registrySelector) Reset(service string) {}
// Close stops the watcher and destroys the cache
func (c *registrySelector) Close() error {
c.rc.Stop()
return nil
}
func (c *registrySelector) String() string {
return "registry"
}
func NewSelector(opts ...Option) Selector {
sopts := Options{
Strategy: Random,
}
for _, opt := range opts {
opt(&sopts)
}
if sopts.Registry == nil {
sopts.Registry = registry.DefaultRegistry
}
s := ®istrySelector{
so: sopts,
}
s.rc = s.newCache()
return s
}