2015-12-09 00:18:06 +00:00
|
|
|
package main
|
|
|
|
|
|
|
|
import (
|
|
|
|
"fmt"
|
|
|
|
"math/rand"
|
|
|
|
"time"
|
|
|
|
|
|
|
|
"github.com/micro/go-micro/client"
|
|
|
|
"github.com/micro/go-micro/cmd"
|
|
|
|
example "github.com/micro/go-micro/examples/server/proto/example"
|
|
|
|
"github.com/micro/go-micro/registry"
|
2015-12-09 19:23:16 +00:00
|
|
|
"github.com/micro/go-micro/selector"
|
2015-12-09 00:18:06 +00:00
|
|
|
"golang.org/x/net/context"
|
|
|
|
)
|
|
|
|
|
|
|
|
func init() {
|
|
|
|
rand.Seed(time.Now().Unix())
|
|
|
|
}
|
|
|
|
|
|
|
|
// Built in random hashed node selector
|
|
|
|
type firstNodeSelector struct {
|
2015-12-09 19:23:16 +00:00
|
|
|
opts selector.Options
|
2015-12-09 00:18:06 +00:00
|
|
|
}
|
|
|
|
|
2015-12-09 19:23:16 +00:00
|
|
|
func (n *firstNodeSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
|
2015-12-09 00:18:06 +00:00
|
|
|
services, err := n.opts.Registry.GetService(service)
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(services) == 0 {
|
2015-12-09 19:23:16 +00:00
|
|
|
return nil, selector.ErrNotFound
|
2015-12-09 00:18:06 +00:00
|
|
|
}
|
|
|
|
|
2015-12-09 19:23:16 +00:00
|
|
|
var sopts selector.SelectOptions
|
2015-12-09 00:18:06 +00:00
|
|
|
for _, opt := range opts {
|
|
|
|
opt(&sopts)
|
|
|
|
}
|
|
|
|
|
|
|
|
for _, filter := range sopts.Filters {
|
|
|
|
services = filter(services)
|
|
|
|
}
|
|
|
|
|
|
|
|
if len(services) == 0 {
|
2015-12-09 19:23:16 +00:00
|
|
|
return nil, selector.ErrNotFound
|
2015-12-09 00:18:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if len(services[0].Nodes) == 0 {
|
2015-12-09 19:23:16 +00:00
|
|
|
return nil, selector.ErrNotFound
|
2015-12-09 00:18:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return func() (*registry.Node, error) {
|
|
|
|
return services[0].Nodes[0], nil
|
|
|
|
}, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (n *firstNodeSelector) Mark(service string, node *registry.Node, err error) {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (n *firstNodeSelector) Reset(service string) {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (n *firstNodeSelector) Close() error {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Return a new first node selector
|
2015-12-09 19:23:16 +00:00
|
|
|
func FirstNodeSelector(opts ...selector.Option) selector.Selector {
|
|
|
|
var sopts selector.Options
|
2015-12-09 00:18:06 +00:00
|
|
|
for _, opt := range opts {
|
|
|
|
opt(&sopts)
|
|
|
|
}
|
|
|
|
if sopts.Registry == nil {
|
|
|
|
sopts.Registry = registry.DefaultRegistry
|
|
|
|
}
|
|
|
|
return &firstNodeSelector{sopts}
|
|
|
|
}
|
|
|
|
|
|
|
|
func call(i int) {
|
|
|
|
// Create new request to service go.micro.srv.example, method Example.Call
|
|
|
|
req := client.NewRequest("go.micro.srv.example", "Example.Call", &example.Request{
|
|
|
|
Name: "John",
|
|
|
|
})
|
|
|
|
|
|
|
|
rsp := &example.Response{}
|
|
|
|
|
|
|
|
// Call service
|
|
|
|
if err := client.Call(context.Background(), req, rsp); err != nil {
|
|
|
|
fmt.Println("call err: ", err, rsp)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
fmt.Println("Call:", i, "rsp:", rsp.Msg)
|
|
|
|
}
|
|
|
|
|
|
|
|
func main() {
|
|
|
|
cmd.Init()
|
|
|
|
|
|
|
|
client.DefaultClient = client.NewClient(
|
|
|
|
client.Selector(FirstNodeSelector()),
|
|
|
|
)
|
|
|
|
|
|
|
|
fmt.Println("\n--- Call example ---\n")
|
|
|
|
for i := 0; i < 10; i++ {
|
|
|
|
call(i)
|
|
|
|
}
|
|
|
|
}
|