73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
// Copyright (C) 2021 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package db
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import "github.com/syncthing/syncthing/lib/protocol"
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// How many files to send in each Index/IndexUpdate message.
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const (
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MaxBatchSizeBytes = 250 * 1024 // Aim for making index messages no larger than 250 KiB (uncompressed)
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MaxBatchSizeFiles = 1000 // Either way, don't include more files than this
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)
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// FileInfoBatch is a utility to do file operations on the database in suitably
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// sized batches.
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type FileInfoBatch struct {
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infos []protocol.FileInfo
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size int
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flushFn func([]protocol.FileInfo) error
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}
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// NewFileInfoBatch returns a new FileInfoBatch that calls fn when it's time
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// to flush.
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func NewFileInfoBatch(fn func([]protocol.FileInfo) error) *FileInfoBatch {
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return &FileInfoBatch{flushFn: fn}
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}
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func (b *FileInfoBatch) SetFlushFunc(fn func([]protocol.FileInfo) error) {
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b.flushFn = fn
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}
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func (b *FileInfoBatch) Append(f protocol.FileInfo) {
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if b.infos == nil {
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b.infos = make([]protocol.FileInfo, 0, MaxBatchSizeFiles)
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}
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b.infos = append(b.infos, f)
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b.size += f.ProtoSize()
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}
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func (b *FileInfoBatch) Full() bool {
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return len(b.infos) >= MaxBatchSizeFiles || b.size >= MaxBatchSizeBytes
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}
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func (b *FileInfoBatch) FlushIfFull() error {
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if b.Full() {
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return b.Flush()
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}
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return nil
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}
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func (b *FileInfoBatch) Flush() error {
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if len(b.infos) == 0 {
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return nil
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}
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if err := b.flushFn(b.infos); err != nil {
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return err
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}
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b.Reset()
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return nil
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}
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func (b *FileInfoBatch) Reset() {
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b.infos = nil
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b.size = 0
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}
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func (b *FileInfoBatch) Size() int {
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return b.size
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}
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