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ids.go
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ids.go
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// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package ids defines identifier types and utility methods specific to the
// fleetspeak server and server components.
package ids
import (
"crypto/rand"
"encoding/hex"
"errors"
)
// BroadcastID identifies a broadcast using 8 arbitrary bytes and can be used as
// a map key.
type BroadcastID struct {
id string
}
// BytesToBroadcastID creates a BroadcastID based on the provided bytes.
func BytesToBroadcastID(b []byte) (BroadcastID, error) {
if len(b) == 0 {
return BroadcastID{}, nil
}
if len(b) != 8 {
return BroadcastID{}, errors.New("BroadcastID must be 8 bytes")
}
return BroadcastID{id: string(b)}, nil
}
// RandomBroadcastID creates a new random BroadcastID.
func RandomBroadcastID() (BroadcastID, error) {
b := make([]byte, 8)
if _, err := rand.Read(b); err != nil {
return BroadcastID{""}, err
}
return BroadcastID{string(b)}, nil
}
// StringToBroadcastID creates a BroadcastID based on the provided hex string.
func StringToBroadcastID(s string) (BroadcastID, error) {
if len(s) != 16 {
return BroadcastID{}, errors.New("BroadcastID must be 16 characters")
}
b, err := hex.DecodeString(s)
if err != nil {
return BroadcastID{}, err
}
return BytesToBroadcastID(b)
}
// String implements fmt.Stringer.
func (i BroadcastID) String() string {
if i.id == "" {
return "nil"
}
return hex.EncodeToString([]byte(i.id))
}
// Bytes returns bytes stored by BroadcastID
func (i BroadcastID) Bytes() []byte {
if i.id == "" {
return nil
}
return []byte(i.id)
}
// AllocationID identifies an allocation from a broadcast.
type AllocationID struct {
id string
}
// RandomAllocationID creates a new random AllocationID.
func RandomAllocationID() (AllocationID, error) {
b := make([]byte, 8)
if _, err := rand.Read(b); err != nil {
return AllocationID{""}, err
}
return AllocationID{string(b)}, nil
}
// Bytes returns bytes stored by AllocationID
func (i AllocationID) Bytes() []byte {
return []byte(i.id)
}
// String implements fmt.Stringer
func (i AllocationID) String() string {
return hex.EncodeToString(i.Bytes())
}