blob: 48e516f9a3c4077bc874618fe29ea99a872b0588 [file] [log] [blame]
// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package global
import (
"strconv"
"strings"
"v.io/v23/discovery"
"v.io/v23/naming"
"v.io/v23/vom"
)
// encodeAdToSuffix encodes the ad.Id and the ad.Attributes into the suffix at
// which we mount the advertisement.
// The format of the generated suffix is id/interfaceName/timestamp/attributes.
//
// TODO(suharshs): Currently only the id and the attributes are encoded; we may
// want to encode the rest of the advertisement someday?
func encodeAdToSuffix(ad *discovery.Advertisement, timestampNs int64) (string, error) {
b, err := vom.Encode(ad.Attributes)
if err != nil {
return "", err
}
// Escape suffixDelim to use it as our delimeter between the id and the attrs.
id := ad.Id.String()
// InterfaceName can never be empty as per validate.go.
interfaceName := naming.EncodeAsNameElement(ad.InterfaceName)
timestamp := strconv.FormatInt(timestampNs, 10)
attr := naming.EncodeAsNameElement(string(b))
return naming.Join(id, interfaceName, timestamp, attr), nil
}
// decodeAdFromSuffix decodes in into an advertisement.
// The format of the input suffix is id/interfaceName/timestamp/attributes.
func decodeAdFromSuffix(in string) (*discovery.Advertisement, int64, error) {
parts := strings.SplitN(in, "/", 4)
if len(parts) != 4 {
return nil, 0, NewErrAdInvalidEncoding(nil, in)
}
var err error
var ok bool
ad := &discovery.Advertisement{}
if ad.Id, err = discovery.ParseAdId(parts[0]); err != nil {
return nil, 0, err
}
if ad.InterfaceName, ok = naming.DecodeFromNameElement(parts[1]); !ok {
return nil, 0, NewErrAdInvalidEncoding(nil, in)
}
timestampNs, err := strconv.ParseInt(parts[2], 10, 64)
if err != nil {
return nil, 0, err
}
attrs, ok := naming.DecodeFromNameElement(parts[3])
if !ok {
return nil, 0, NewErrAdInvalidEncoding(nil, in)
}
if err = vom.Decode([]byte(attrs), &ad.Attributes); err != nil {
return nil, 0, err
}
return ad, timestampNs, nil
}