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testAndSet.go
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/
testAndSet.go
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package etcd
import (
"encoding/json"
"fmt"
"github.com/coreos/etcd/store"
"io/ioutil"
"net/http"
"net/url"
"path"
)
func (c *Client) TestAndSet(key string, prevValue string, value string, ttl uint64) (*store.Response, bool, error) {
logger.Debugf("set %s, %s[%s], ttl: %d, [%s]", key, value, prevValue, ttl, c.cluster.Leader)
v := url.Values{}
v.Set("value", value)
v.Set("prevValue", prevValue)
if ttl > 0 {
v.Set("ttl", fmt.Sprintf("%v", ttl))
}
resp, err := c.sendRequest("POST", path.Join("keys", key), v.Encode())
if err != nil {
return nil, false, err
}
b, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return nil, false, err
}
if resp.StatusCode != http.StatusOK {
return nil, false, handleError(b)
}
var result store.Response
err = json.Unmarshal(b, &result)
if err != nil {
return nil, false, err
}
if result.PrevValue == prevValue && result.Value == value {
return &result, true, nil
}
return &result, false, nil
}