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cache.go
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cache.go
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package debug
import (
"sync"
"time"
"github.com/btccom/go-micro/v2/config/cmd"
log "github.com/btccom/go-micro/v2/logger"
"github.com/btccom/go-micro/v2/registry"
"github.com/btccom/go-micro/v2/registry/cache"
)
// Stats is the Debug.Stats handler
type cached struct {
registry registry.Registry
sync.RWMutex
serviceCache []*registry.Service
}
func newCache(done <-chan bool) *cached {
c := &cached{
registry: cache.New(*cmd.DefaultOptions().Registry),
}
// first scan
if err := c.scan(); err != nil {
return nil
}
go c.run(done)
return c
}
func (c *cached) services() []*registry.Service {
c.RLock()
defer c.RUnlock()
return c.serviceCache
}
func (c *cached) run(done <-chan bool) {
t := time.NewTicker(10 * time.Second)
defer t.Stop()
for {
select {
case <-done:
return
case <-t.C:
if err := c.scan(); err != nil {
log.Debug(err)
}
}
}
}
func (c *cached) scan() error {
services, err := c.registry.ListServices()
if err != nil {
return err
}
if err != nil {
return err
}
serviceMap := make(map[string]*registry.Service)
// check each service has nodes
for _, service := range services {
if len(service.Nodes) > 0 {
serviceMap[service.Name+service.Version] = service
continue
}
// get nodes that does not exist
newServices, err := c.registry.GetService(service.Name)
if err != nil {
continue
}
// store service by version
for _, service := range newServices {
serviceMap[service.Name+service.Version] = service
}
}
// flatten the map
var serviceList []*registry.Service
for _, service := range serviceMap {
serviceList = append(serviceList, service)
}
// save the list
c.Lock()
c.serviceCache = serviceList
c.Unlock()
return nil
}