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54 lines
1.1 KiB
54 lines
1.1 KiB
package etcd
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import (
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"math/rand"
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"strings"
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"sync"
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)
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type Cluster struct {
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Leader string `json:"leader"`
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Machines []string `json:"machines"`
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picked int
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mu sync.RWMutex
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}
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func NewCluster(machines []string) *Cluster {
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// if an empty slice was sent in then just assume HTTP 4001 on localhost
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if len(machines) == 0 {
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machines = []string{"http://127.0.0.1:4001"}
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}
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machines = shuffleStringSlice(machines)
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logger.Debug("Shuffle cluster machines", machines)
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// default leader and machines
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return &Cluster{
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Leader: "",
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Machines: machines,
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picked: rand.Intn(len(machines)),
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}
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}
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func (cl *Cluster) failure() {
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cl.mu.Lock()
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defer cl.mu.Unlock()
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cl.picked = (cl.picked + 1) % len(cl.Machines)
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}
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func (cl *Cluster) pick() string {
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cl.mu.Lock()
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defer cl.mu.Unlock()
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return cl.Machines[cl.picked]
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}
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func (cl *Cluster) updateFromStr(machines string) {
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cl.mu.Lock()
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defer cl.mu.Unlock()
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cl.Machines = strings.Split(machines, ",")
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for i := range cl.Machines {
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cl.Machines[i] = strings.TrimSpace(cl.Machines[i])
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}
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cl.Machines = shuffleStringSlice(cl.Machines)
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cl.picked = rand.Intn(len(cl.Machines))
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}
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