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counter.go
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counter.go
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package etcdplus
import (
"github.com/coreos/go-etcd/etcd"
"strconv"
)
type Counter struct {
client *etcd.Client
key string
}
func NewCounter(client *etcd.Client, key string) *Counter {
if key == "" {
key = getUUID()
}
counter := Counter{
client: client,
key: key,
}
client.TestAndSet(counter.key, "", "0", 0)
return &counter
}
func (c *Counter) Increment() error {
v, err := c.GetValue()
if err != nil {
return err
}
err = c.SetValue(v + 1)
if err != nil {
return err
}
return nil
}
func (c *Counter) Decrement() error {
v, err := c.GetValue()
if err != nil {
return err
}
err = c.SetValue(v - 1)
if err != nil {
return err
}
return nil
}
func (c *Counter) GetValue() (int, error) {
resp, err := c.client.Get(c.key)
if err != nil {
return 0, err
}
i, err := strconv.Atoi(resp[0].Value)
if err != nil {
panic(err)
}
return i, nil
}
func (c *Counter) SetValue(value int) error {
_, err := c.client.Set(c.key, strconv.Itoa(value), 0)
if err != nil {
return err
}
return nil
}