61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package client
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import (
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"math/rand"
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"time"
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"github.com/micro/go-micro/errors"
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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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// NodeSelector is used to Retrieve a node to which a request
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// should be routed. It takes context and Request and returns a
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// single node. If a node cannot be selected it should return
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// an error. Response is called to inform the selector of the
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// response from a client call. Reset is called to zero out
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// any state.
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type NodeSelector interface {
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Retrieve(context.Context, Request) (*registry.Node, error)
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Response(*registry.Node, error)
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Reset()
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}
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func init() {
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rand.Seed(time.Now().UnixNano())
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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 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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