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put_handler.go
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put_handler.go
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package v2
import (
"net/http"
"strconv"
"time"
etcdErr "github.com/coreos/etcd/error"
"github.com/coreos/etcd/store"
"github.com/coreos/go-raft"
"github.com/gorilla/mux"
)
func PutHandler(w http.ResponseWriter, req *http.Request, s Server) error {
vars := mux.Vars(req)
key := "/" + vars["key"]
req.ParseForm()
value := req.Form.Get("value")
expireTime, err := store.TTL(req.Form.Get("ttl"))
if err != nil {
return etcdErr.NewError(etcdErr.EcodeTTLNaN, "Update", store.UndefIndex, store.UndefTerm)
}
prevValue, valueOk := req.Form["prevValue"]
prevIndexStr, indexOk := req.Form["prevIndex"]
prevExist, existOk := req.Form["prevExist"]
var c raft.Command
// Set handler: create a new node or replace the old one.
if !valueOk && !indexOk && !existOk {
return SetHandler(w, req, s, key, value, expireTime)
}
// update with test
if existOk {
if prevExist[0] == "false" {
// Create command: create a new node. Fail, if a node already exists
// Ignore prevIndex and prevValue
return CreateHandler(w, req, s, key, value, expireTime)
}
if prevExist[0] == "true" && !indexOk && !valueOk {
return UpdateHandler(w, req, s, key, value, expireTime)
}
}
var prevIndex uint64
if indexOk {
prevIndex, err = strconv.ParseUint(prevIndexStr[0], 10, 64)
// bad previous index
if err != nil {
return etcdErr.NewError(etcdErr.EcodeIndexNaN, "CompareAndSwap", store.UndefIndex, store.UndefTerm)
}
} else {
prevIndex = 0
}
if valueOk {
if prevValue[0] == "" {
return etcdErr.NewError(etcdErr.EcodePrevValueRequired, "CompareAndSwap", store.UndefIndex, store.UndefTerm)
}
}
c = &store.CompareAndSwapCommand{
Key: key,
Value: value,
PrevValue: prevValue[0],
PrevIndex: prevIndex,
}
return s.Dispatch(c, w, req)
}
func SetHandler(w http.ResponseWriter, req *http.Request, s Server, key, value string, expireTime time.Time) error {
c := &store.SetCommand{
Key: key,
Value: value,
ExpireTime: expireTime,
}
return s.Dispatch(c, w, req)
}
func CreateHandler(w http.ResponseWriter, req *http.Request, s Server, key, value string, expireTime time.Time) error {
c := &store.CreateCommand{
Key: key,
Value: value,
ExpireTime: expireTime,
}
return s.Dispatch(c, w, req)
}
func UpdateHandler(w http.ResponseWriter, req *http.Request, s Server, key, value string, expireTime time.Time) error {
// Update should give at least one option
if value == "" && expireTime.Sub(store.Permanent) == 0 {
return etcdErr.NewError(etcdErr.EcodeValueOrTTLRequired, "Update", store.UndefIndex, store.UndefTerm)
}
c := &store.UpdateCommand{
Key: key,
Value: value,
ExpireTime: expireTime,
}
return s.Dispatch(c, w, req)
}