mirror of
https://github.com/dutchcoders/transfer.sh.git
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56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery
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import (
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"math/rand"
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"os"
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"sync"
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"time"
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)
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// Support for random values (typically job IDs and insert IDs).
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const alphanum = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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var (
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rngMu sync.Mutex
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rng = rand.New(rand.NewSource(time.Now().UnixNano() ^ int64(os.Getpid())))
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)
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// For testing.
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var randomIDFn = randomID
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// As of August 2017, the BigQuery service uses 27 alphanumeric characters for
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// suffixes.
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const randomIDLen = 27
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func randomID() string {
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// This is used for both job IDs and insert IDs.
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var b [randomIDLen]byte
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rngMu.Lock()
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for i := 0; i < len(b); i++ {
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b[i] = alphanum[rng.Intn(len(alphanum))]
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}
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rngMu.Unlock()
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return string(b[:])
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}
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// Seed seeds this package's random number generator, used for generating job and
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// insert IDs. Use Seed to obtain repeatable, deterministic behavior from bigquery
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// clients. Seed should be called before any clients are created.
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func Seed(s int64) {
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rng = rand.New(rand.NewSource(s))
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}
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