func parseKeyRequest(r *http.Request, clock clockwork.Clock) (etcdserverpb.Request, bool, error) {
	var noValueOnSuccess bool
	emptyReq := etcdserverpb.Request{}

	err := r.ParseForm()
	if err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidForm,
			err.Error(),
		)
	}

	if !strings.HasPrefix(r.URL.Path, keysPrefix) {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidForm,
			"incorrect key prefix",
		)
	}
	p := path.Join(etcdserver.StoreKeysPrefix, r.URL.Path[len(keysPrefix):])

	var pIdx, wIdx uint64
	if pIdx, err = getUint64(r.Form, "prevIndex"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeIndexNaN,
			`invalid value for "prevIndex"`,
		)
	}
	if wIdx, err = getUint64(r.Form, "waitIndex"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeIndexNaN,
			`invalid value for "waitIndex"`,
		)
	}

	var rec, sort, wait, dir, quorum, stream bool
	if rec, err = getBool(r.Form, "recursive"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "recursive"`,
		)
	}
	if sort, err = getBool(r.Form, "sorted"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "sorted"`,
		)
	}
	if wait, err = getBool(r.Form, "wait"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "wait"`,
		)
	}
	// TODO(jonboulle): define what parameters dir is/isn't compatible with?
	if dir, err = getBool(r.Form, "dir"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "dir"`,
		)
	}
	if quorum, err = getBool(r.Form, "quorum"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "quorum"`,
		)
	}
	if stream, err = getBool(r.Form, "stream"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "stream"`,
		)
	}

	if wait && r.Method != "GET" {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`"wait" can only be used with GET requests`,
		)
	}

	pV := r.FormValue("prevValue")
	if _, ok := r.Form["prevValue"]; ok && pV == "" {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodePrevValueRequired,
			`"prevValue" cannot be empty`,
		)
	}

	if noValueOnSuccess, err = getBool(r.Form, "noValueOnSuccess"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "noValueOnSuccess"`,
		)
	}

	// TTL is nullable, so leave it null if not specified
	// or an empty string
	var ttl *uint64
	if len(r.FormValue("ttl")) > 0 {
		i, err := getUint64(r.Form, "ttl")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeTTLNaN,
				`invalid value for "ttl"`,
			)
		}
		ttl = &i
	}

	// prevExist is nullable, so leave it null if not specified
	var pe *bool
	if _, ok := r.Form["prevExist"]; ok {
		bv, err := getBool(r.Form, "prevExist")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeInvalidField,
				"invalid value for prevExist",
			)
		}
		pe = &bv
	}

	// refresh is nullable, so leave it null if not specified
	var refresh *bool
	if _, ok := r.Form["refresh"]; ok {
		bv, err := getBool(r.Form, "refresh")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeInvalidField,
				"invalid value for refresh",
			)
		}
		refresh = &bv
		if refresh != nil && *refresh {
			val := r.FormValue("value")
			if _, ok := r.Form["value"]; ok && val != "" {
				return emptyReq, false, v2error.NewRequestError(
					v2error.EcodeRefreshValue,
					`A value was provided on a refresh`,
				)
			}
			if ttl == nil {
				return emptyReq, false, v2error.NewRequestError(
					v2error.EcodeRefreshTTLRequired,
					`No TTL value set`,
				)
			}
		}
	}

	rr := etcdserverpb.Request{
		Method:    r.Method,
		Path:      p,
		Val:       r.FormValue("value"),
		Dir:       dir,
		PrevValue: pV,
		PrevIndex: pIdx,
		PrevExist: pe,
		Wait:      wait,
		Since:     wIdx,
		Recursive: rec,
		Sorted:    sort,
		Quorum:    quorum,
		Stream:    stream,
	}

	if pe != nil {
		rr.PrevExist = pe
	}

	if refresh != nil {
		rr.Refresh = refresh
	}

	// Null TTL is equivalent to unset Expiration
	if ttl != nil {
		expr := time.Duration(*ttl) * time.Second
		rr.Expiration = clock.Now().Add(expr).UnixNano()
	}

	return rr, noValueOnSuccess, nil
}
func parseKeyRequest(r *http.Request, clock clockwork.Clock) (etcdserverpb.Request, bool, error) {
	var noValueOnSuccess bool
	emptyReq := etcdserverpb.Request{}

	err := r.ParseForm()
	if err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidForm,
			err.Error(),
		)
	}

	if !strings.HasPrefix(r.URL.Path, keysPrefix) {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidForm,
			"incorrect key prefix",
		)
	}
	p := path.Join(etcdserver.StoreKeysPrefix, r.URL.Path[len(keysPrefix):])

	var pIdx, wIdx uint64
	if pIdx, err = getUint64(r.Form, "prevIndex"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeIndexNaN,
			`invalid value for "prevIndex"`,
		)
	}
	if wIdx, err = getUint64(r.Form, "waitIndex"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeIndexNaN,
			`invalid value for "waitIndex"`,
		)
	}

	var rec, sort, wait, dir, quorum, stream bool
	if rec, err = getBool(r.Form, "recursive"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "recursive"`,
		)
	}
	if sort, err = getBool(r.Form, "sorted"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "sorted"`,
		)
	}
	if wait, err = getBool(r.Form, "wait"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "wait"`,
		)
	}
	// TODO(jonboulle): define what parameters dir is/isn't compatible with?
	if dir, err = getBool(r.Form, "dir"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "dir"`,
		)
	}
	if quorum, err = getBool(r.Form, "quorum"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "quorum"`,
		)
	}
	if stream, err = getBool(r.Form, "stream"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "stream"`,
		)
	}

	if wait && r.Method != "GET" {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`"wait" can only be used with GET requests`,
		)
	}

	pV := r.FormValue("prevValue")
	if _, ok := r.Form["prevValue"]; ok && pV == "" {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodePrevValueRequired,
			`"prevValue" cannot be empty`,
		)
	}

	if noValueOnSuccess, err = getBool(r.Form, "noValueOnSuccess"); err != nil {
		return emptyReq, false, v2error.NewRequestError(
			v2error.EcodeInvalidField,
			`invalid value for "noValueOnSuccess"`,
		)
	}

	// TTL is nullable, so leave it null if not specified
	// or an empty string
	var ttl *uint64
	if len(r.FormValue("ttl")) > 0 {
		i, err := getUint64(r.Form, "ttl")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeTTLNaN,
				`invalid value for "ttl"`,
			)
		}
		ttl = &i
	}

	// prevExist is nullable, so leave it null if not specified
	var pe *bool
	if _, ok := r.Form["prevExist"]; ok {
		bv, err := getBool(r.Form, "prevExist")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeInvalidField,
				"invalid value for prevExist",
			)
		}
		pe = &bv
	}

	// refresh is nullable, so leave it null if not specified
	var refresh *bool
	if _, ok := r.Form["refresh"]; ok {
		bv, err := getBool(r.Form, "refresh")
		if err != nil {
			return emptyReq, false, v2error.NewRequestError(
				v2error.EcodeInvalidField,
				"invalid value for refresh",
			)
		}
		refresh = &bv
		if refresh != nil && *refresh {
			val := r.FormValue("value")
			if _, ok := r.Form["value"]; ok && val != "" {
				return emptyReq, false, v2error.NewRequestError(
					v2error.EcodeRefreshValue,
					`A value was provided on a refresh`,
				)
			}
			if ttl == nil {
				return emptyReq, false, v2error.NewRequestError(
					v2error.EcodeRefreshTTLRequired,
					`No TTL value set`,
				)
			}
		}
	}

	rr := etcdserverpb.Request{
		Method:    r.Method,
		Path:      p,
		Val:       r.FormValue("value"),
		Dir:       dir,
		PrevValue: pV,
		PrevIndex: pIdx,
		PrevExist: pe,
		Wait:      wait,
		Since:     wIdx,
		Recursive: rec,
		Sorted:    sort,
		Quorum:    quorum,
		Stream:    stream,
	}

	if pe != nil {
		rr.PrevExist = pe
	}

	if refresh != nil {
		rr.Refresh = refresh
	}

	// Null TTL is equivalent to unset Expiration
	if ttl != nil {
		expr := time.Duration(*ttl) * time.Second
		rr.Expiration = clock.Now().Add(expr).UnixNano()
	}

	return rr, noValueOnSuccess, nil
}
// parseKeyRequest converts a received http.Request on keysPrefix to
// a server Request, performing validation of supplied fields as appropriate.
// If any validation fails, an empty Request and non-nil error is returned.