38 lines
954 B
Go
38 lines
954 B
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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)
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// NodeSelector is used to retrieve a node to which a request
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// should be routed. It takes a list of services and selects
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// a single node. If a node cannot be selected it should return
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// an error. A list of services is provided as a service may
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// have 1 or more versions.
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type NodeSelector func(service []*registry.Service) (*registry.Node, error)
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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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func nodeSelector(service []*registry.Service) (*registry.Node, error) {
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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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n := i % len(service[j].Nodes)
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return service[j].Nodes[n], nil
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}
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