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dir_block_map_disk.go
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dir_block_map_disk.go
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// Copyright 2019 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package libkbfs
import (
"context"
"github.com/keybase/client/go/kbfs/data"
"github.com/keybase/client/go/kbfs/libkey"
"github.com/pkg/errors"
)
// dirBlockMapDisk tracks dir block info while making a revision, by
// using a disk-based block cache.
type dirBlockMapDisk struct {
dirtyBcache *DirtyBlockCacheDisk
kmd libkey.KeyMetadata
ptrs map[data.BlockPointer]bool
}
var _ dirBlockMap = (*dirBlockMapDisk)(nil)
func newDirBlockMapDisk(
dirtyBcache *DirtyBlockCacheDisk, kmd libkey.KeyMetadata) *dirBlockMapDisk {
return &dirBlockMapDisk{
dirtyBcache: dirtyBcache,
kmd: kmd,
ptrs: make(map[data.BlockPointer]bool),
}
}
func (dbmd *dirBlockMapDisk) putBlock(
ctx context.Context, ptr data.BlockPointer, block *data.DirBlock) error {
err := dbmd.dirtyBcache.Put(
ctx, dbmd.kmd.TlfID(), ptr, data.MasterBranch, block)
if err != nil {
return err
}
dbmd.ptrs[ptr] = true
return nil
}
func (dbmd *dirBlockMapDisk) getBlock(
ctx context.Context, ptr data.BlockPointer) (*data.DirBlock, error) {
if !dbmd.ptrs[ptr] {
return nil, errors.Errorf("No such block %s", ptr)
}
block, err := dbmd.dirtyBcache.Get(ctx, dbmd.kmd.TlfID(), ptr, data.MasterBranch)
if err != nil {
return nil, err
}
dblock, ok := block.(*data.DirBlock)
if !ok {
return nil, errors.Errorf(
"Unexpected block type for dir block: %T", block)
}
return dblock, nil
}
func (dbmd *dirBlockMapDisk) hasBlock(
_ context.Context, ptr data.BlockPointer) (bool, error) {
return dbmd.ptrs[ptr], nil
}
func (dbmd *dirBlockMapDisk) deleteBlock(
_ context.Context, ptr data.BlockPointer) error {
delete(dbmd.ptrs, ptr)
return nil
}
// numBlocks only tracks the blocks that have been put into the dirty
// block cache since `dbdm` was constructed.
func (dbmd *dirBlockMapDisk) numBlocks() int {
return len(dbmd.ptrs)
}