Golang Request.PrevExists Examples

Example #1

File: http.go Project: leandroferro/etcd

// parseRequest converts a received http.Request to a server Request,
// performing validation of supplied fields as appropriate.
// If any validation fails, an empty Request and non-nil error is returned.
func parseRequest(r *http.Request, id int64) (etcdserverpb.Request, error) {
	emptyReq := etcdserverpb.Request{}

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

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

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

	var rec, sort, wait bool
	if rec, err = getBool(r.Form, "recursive"); err != nil {
		return emptyReq, etcdErr.NewRequestError(
			etcdErr.EcodeInvalidField,
			`invalid value for "recursive"`,
		)
	}
	if sort, err = getBool(r.Form, "sorted"); err != nil {
		return emptyReq, etcdErr.NewRequestError(
			etcdErr.EcodeInvalidField,
			`invalid value for "sorted"`,
		)
	}
	if wait, err = getBool(r.Form, "wait"); err != nil {
		return emptyReq, etcdErr.NewRequestError(
			etcdErr.EcodeInvalidField,
			`invalid value for "wait"`,
		)
	}

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

	rr := etcdserverpb.Request{
		Id:         id,
		Method:     r.Method,
		Path:       p,
		Val:        r.FormValue("value"),
		PrevValue:  r.FormValue("prevValue"),
		PrevIndex:  pIdx,
		PrevExists: pe,
		Recursive:  rec,
		Since:      wIdx,
		Sorted:     sort,
		Wait:       wait,
	}

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

	// TODO(jonboulle): use fake clock instead of time module
	// https://github.com/coreos/etcd/issues/1021
	if ttl > 0 {
		expr := time.Duration(ttl) * time.Second
		rr.Expiration = time.Now().Add(expr).UnixNano()
	}

	return rr, nil
}