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* update github.com/blevesearch/bleve v2.0.2 -> v2.0.3 * github.com/denisenkom/go-mssqldb v0.9.0 -> v0.10.0 * github.com/editorconfig/editorconfig-core-go v2.4.1 -> v2.4.2 * github.com/go-chi/cors v1.1.1 -> v1.2.0 * github.com/go-git/go-billy v5.0.0 -> v5.1.0 * github.com/go-git/go-git v5.2.0 -> v5.3.0 * github.com/go-ldap/ldap v3.2.4 -> v3.3.0 * github.com/go-redis/redis v8.6.0 -> v8.8.2 * github.com/go-sql-driver/mysql v1.5.0 -> v1.6.0 * github.com/go-swagger/go-swagger v0.26.1 -> v0.27.0 * github.com/lib/pq v1.9.0 -> v1.10.1 * github.com/mattn/go-sqlite3 v1.14.6 -> v1.14.7 * github.com/go-testfixtures/testfixtures v3.5.0 -> v3.6.0 * github.com/issue9/identicon v1.0.1 -> v1.2.0 * github.com/klauspost/compress v1.11.8 -> v1.12.1 * github.com/mgechev/revive v1.0.3 -> v1.0.6 * github.com/microcosm-cc/bluemonday v1.0.7 -> v1.0.8 * github.com/niklasfasching/go-org v1.4.0 -> v1.5.0 * github.com/olivere/elastic v7.0.22 -> v7.0.24 * github.com/pelletier/go-toml v1.8.1 -> v1.9.0 * github.com/prometheus/client_golang v1.9.0 -> v1.10.0 * github.com/xanzy/go-gitlab v0.44.0 -> v0.48.0 * github.com/yuin/goldmark v1.3.3 -> v1.3.5 * github.com/6543/go-version v1.2.4 -> v1.3.1 * do github.com/lib/pq v1.10.0 -> v1.10.1 again ...
69 lines
1.6 KiB
Go
Vendored
69 lines
1.6 KiB
Go
Vendored
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package detrand provides deterministically random functionality.
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//
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// The pseudo-randomness of these functions is seeded by the program binary
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// itself and guarantees that the output does not change within a program,
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// while ensuring that the output is unstable across different builds.
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package detrand
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import (
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"encoding/binary"
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"hash/fnv"
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"os"
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)
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// Disable disables detrand such that all functions returns the zero value.
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// This function is not concurrent-safe and must be called during program init.
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func Disable() {
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randSeed = 0
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}
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// Bool returns a deterministically random boolean.
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func Bool() bool {
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return randSeed%2 == 1
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}
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// Intn returns a deterministically random integer between 0 and n-1, inclusive.
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func Intn(n int) int {
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if n <= 0 {
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panic("must be positive")
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}
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return int(randSeed % uint64(n))
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}
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// randSeed is a best-effort at an approximate hash of the Go binary.
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var randSeed = binaryHash()
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func binaryHash() uint64 {
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// Open the Go binary.
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s, err := os.Executable()
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if err != nil {
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return 0
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}
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f, err := os.Open(s)
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if err != nil {
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return 0
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}
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defer f.Close()
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// Hash the size and several samples of the Go binary.
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const numSamples = 8
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var buf [64]byte
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h := fnv.New64()
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fi, err := f.Stat()
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if err != nil {
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return 0
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}
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binary.LittleEndian.PutUint64(buf[:8], uint64(fi.Size()))
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h.Write(buf[:8])
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for i := int64(0); i < numSamples; i++ {
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if _, err := f.ReadAt(buf[:], i*fi.Size()/numSamples); err != nil {
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return 0
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}
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h.Write(buf[:])
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}
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return h.Sum64()
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}
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