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tokens.go
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/
tokens.go
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// Copyright 2015 Netflix, 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
//
// http://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 chunked
import "crypto/rand"
const tokenSize = 16
// Tokens are used during set handling to uniquely identify
// a specific set
var tokens chan [tokenSize]byte
func init() {
// keep 1000 unique tokens around for write-heavy loads
// otherwise we have to wait on a read from /dev/urandom
tokens = make(chan [tokenSize]byte, 1000)
go genTokens()
}
func genTokens() {
for {
var retval [tokenSize]byte
rand.Read(retval[:])
tokens <- retval
}
}