52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
// Copyright (c) 2019 David Crawshaw <david@zentus.com>
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// Copyright (c) 2021 Ross Light <rosss@zombiezen.com>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// SPDX-License-Identifier: ISC
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package sqlitex
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import (
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"crypto/rand"
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"fmt"
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"math/big"
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"zombiezen.com/go/sqlite"
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)
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// InsertRandID executes stmt with a random value in the range [min, max) for $param.
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func InsertRandID(stmt *sqlite.Stmt, param string, min, max int64) (int64, error) {
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if min < 0 {
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return 0, fmt.Errorf("sqlitex.InsertRandID: min (%d) is negative", min)
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}
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for i := 0; ; i++ {
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v, err := rand.Int(rand.Reader, big.NewInt(max-min))
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if err != nil {
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return 0, fmt.Errorf("sqlitex.InsertRandID: %w", err)
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}
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id := v.Int64() + min
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stmt.Reset()
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stmt.SetInt64(param, id)
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_, err = stmt.Step()
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if err == nil {
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return id, nil
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}
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if i >= 100 || sqlite.ErrCode(err) != sqlite.ResultConstraintPrimaryKey {
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return 0, fmt.Errorf("sqlitex.InsertRandID: %w", err)
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}
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}
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}
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