88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package main
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import (
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"fmt"
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"math/rand"
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"time"
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"github.com/micro/go-micro/client"
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"github.com/micro/go-micro/cmd"
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"github.com/micro/go-micro/errors"
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example "github.com/micro/go-micro/examples/server/proto/example"
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"github.com/micro/go-micro/registry"
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"golang.org/x/net/context"
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)
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func init() {
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rand.Seed(time.Now().Unix())
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}
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// Built in random hashed node selector
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type nodeSelector struct {
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r registry.Registry
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}
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func (n *nodeSelector) Retrieve(ctx context.Context, req client.Request) (*registry.Node, error) {
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service, err := n.r.GetService(req.Service())
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if err != nil {
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return nil, errors.InternalServerError("go.micro.client", err.Error())
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}
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if len(service) == 0 {
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return nil, errors.NotFound("go.micro.client", "Service not found")
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}
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i := rand.Int()
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j := i % len(service)
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if len(service[j].Nodes) == 0 {
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return nil, errors.NotFound("go.micro.client", "Service not found")
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}
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k := i % len(service[j].Nodes)
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return service[j].Nodes[k], nil
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}
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func (n *nodeSelector) Response(node *registry.Node, err error) {
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return
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}
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func (n *nodeSelector) Reset() {
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return
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}
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// Return a new random node selector
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func RandomSelector(r registry.Registry) client.NodeSelector {
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return &nodeSelector{r}
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}
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func call(i int) {
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// Create new request to service go.micro.srv.example, method Example.Call
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req := client.NewRequest("go.micro.srv.example", "Example.Call", &example.Request{
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Name: "John",
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})
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rsp := &example.Response{}
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// Call service
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if err := client.Call(context.Background(), req, rsp); err != nil {
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fmt.Println("call err: ", err, rsp)
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return
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}
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fmt.Println("Call:", i, "rsp:", rsp.Msg)
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}
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func main() {
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cmd.Init()
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client.DefaultClient = client.NewClient(
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client.Select(RandomSelector),
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)
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fmt.Println("\n--- Call example ---\n")
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for i := 0; i < 10; i++ {
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call(i)
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}
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}
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