First commit in strategy rework

selector/cache/cache.go

@@ -2,7 +2,6 @@ package cache
 
 import (
 	"log"
-	"math/rand"
 	"sync"
 	"time"
 
@@ -33,10 +32,6 @@ var (
 	DefaultTTL = time.Minute
 )
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 func (c *cacheSelector) quit() bool {
 	select {
 	case <-c.exit:
@@ -329,7 +324,10 @@ func (c *cacheSelector) Options() selector.Options {
 }
 
 func (c *cacheSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
-	var sopts selector.SelectOptions
+	sopts := selector.SelectOptions{
+		Strategy: c.so.Strategy,
+	}
+
 	for _, opt := range opts {
 		opt(&sopts)
 	}
@@ -352,29 +350,7 @@ func (c *cacheSelector) Select(service string, opts ...selector.SelectOption) (s
 		return nil, selector.ErrNotFound
 	}
 
-	var nodes []*registry.Node
-
-	for _, service := range services {
-		for _, node := range service.Nodes {
-			nodes = append(nodes, node)
-		}
-	}
-
-	if len(nodes) == 0 {
-		return nil, selector.ErrNotFound
-	}
-
-	return func() (*registry.Node, error) {
-		i := rand.Int()
-		j := i % len(services)
-
-		if len(services[j].Nodes) == 0 {
-			return nil, selector.ErrNotFound
-		}
-
-		k := i % len(services[j].Nodes)
-		return services[j].Nodes[k], nil
-	}, nil
+	return sopts.Strategy(services), nil
 }
 
 func (c *cacheSelector) Mark(service string, node *registry.Node, err error) {
@@ -407,7 +383,9 @@ func (c *cacheSelector) String() string {
 }
 
 func NewSelector(opts ...selector.Option) selector.Selector {
-	var sopts selector.Options
+	sopts := selector.Options{
+		Strategy: selector.Random,
+	}
 
 	for _, opt := range opts {
 		opt(&sopts)