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block_put_state_memory.go
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block_put_state_memory.go
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// Copyright 2018 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/pkg/errors"
)
type blockState struct {
block data.Block
readyBlockData data.ReadyBlockData
syncedCb func() error
oldPtr data.BlockPointer
}
// blockPutStateMemory is an internal structure to track data in
// memory when putting blocks.
type blockPutStateMemory struct {
blockStates map[data.BlockPointer]blockState
lastBlock data.BlockPointer
}
var _ blockPutStateCopiable = (*blockPutStateMemory)(nil)
func newBlockPutStateMemory(length int) *blockPutStateMemory {
bps := &blockPutStateMemory{}
bps.blockStates = make(map[data.BlockPointer]blockState, length)
return bps
}
// AddNewBlock tracks a new block that will be put. If syncedCb is
// non-nil, it will be called whenever the put for that block is
// complete (whether or not the put resulted in an error). Currently
// it will not be called if the block is never put (due to an earlier
// error).
func (bps *blockPutStateMemory) AddNewBlock(
_ context.Context, blockPtr data.BlockPointer, block data.Block,
readyBlockData data.ReadyBlockData, syncedCb func() error) error {
bps.blockStates[blockPtr] = blockState{
block, readyBlockData, syncedCb, data.ZeroPtr}
bps.lastBlock = blockPtr
return nil
}
// SaveOldPtr stores the given BlockPointer as the old (pre-readied)
// pointer for the most recent blockState.
func (bps *blockPutStateMemory) SaveOldPtr(
_ context.Context, oldPtr data.BlockPointer) error {
if bps.lastBlock == data.ZeroPtr {
return errors.New("No blocks have been added")
}
bs, ok := bps.blockStates[bps.lastBlock]
if !ok {
return errors.Errorf("Last block %v doesn't exist", bps.lastBlock)
}
bs.oldPtr = oldPtr
bps.blockStates[bps.lastBlock] = bs
return nil
}
func (bps *blockPutStateMemory) oldPtr(
_ context.Context, blockPtr data.BlockPointer) (data.BlockPointer, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.oldPtr, nil
}
return data.BlockPointer{}, errors.WithStack(
data.NoSuchBlockError{ID: blockPtr.ID})
}
func (bps *blockPutStateMemory) mergeOtherBps(
_ context.Context, other blockPutStateCopiable) error {
otherMem, ok := other.(*blockPutStateMemory)
if !ok {
return errors.Errorf("Cannot remove other bps of type %T", other)
}
for ptr, bs := range otherMem.blockStates {
bps.blockStates[ptr] = bs
}
return nil
}
func (bps *blockPutStateMemory) removeOtherBps(
ctx context.Context, other blockPutStateCopiable) error {
otherMem, ok := other.(*blockPutStateMemory)
if !ok {
return errors.Errorf("Cannot remove other bps of type %T", other)
}
if len(otherMem.blockStates) == 0 {
return nil
}
otherMemPtrs := make(map[data.BlockPointer]bool, len(otherMem.blockStates))
for ptr := range otherMem.blockStates {
otherMemPtrs[ptr] = true
}
newBps, err := bps.deepCopyWithBlacklist(ctx, otherMemPtrs)
if err != nil {
return err
}
newBpsMem, ok := newBps.(*blockPutStateMemory)
if !ok {
return errors.Errorf(
"Bad deep copy type when removing blocks: %T", newBps)
}
bps.blockStates = newBpsMem.blockStates
return nil
}
func (bps *blockPutStateMemory) Ptrs() []data.BlockPointer {
ret := make([]data.BlockPointer, len(bps.blockStates))
i := 0
for ptr := range bps.blockStates {
ret[i] = ptr
i++
}
return ret
}
func (bps *blockPutStateMemory) GetBlock(
_ context.Context, blockPtr data.BlockPointer) (data.Block, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.block, nil
}
return nil, errors.WithStack(data.NoSuchBlockError{ID: blockPtr.ID})
}
func (bps *blockPutStateMemory) getReadyBlockData(
_ context.Context, blockPtr data.BlockPointer) (data.ReadyBlockData, error) {
bs, ok := bps.blockStates[blockPtr]
if ok {
return bs.readyBlockData, nil
}
return data.ReadyBlockData{}, errors.WithStack(
data.NoSuchBlockError{ID: blockPtr.ID})
}
func (bps *blockPutStateMemory) synced(blockPtr data.BlockPointer) error {
bs, ok := bps.blockStates[blockPtr]
if ok && bs.syncedCb != nil {
return bs.syncedCb()
}
return nil
}
func (bps *blockPutStateMemory) numBlocks() int {
return len(bps.blockStates)
}
func (bps *blockPutStateMemory) deepCopy(
_ context.Context) (blockPutStateCopiable, error) {
newBps := &blockPutStateMemory{}
newBps.blockStates = make(map[data.BlockPointer]blockState, len(bps.blockStates))
for ptr, bs := range bps.blockStates {
newBps.blockStates[ptr] = bs
}
return newBps, nil
}
func (bps *blockPutStateMemory) deepCopyWithBlacklist(
_ context.Context, blacklist map[data.BlockPointer]bool) (
blockPutStateCopiable, error) {
newBps := &blockPutStateMemory{}
newLen := len(bps.blockStates) - len(blacklist)
if newLen < 0 {
newLen = 0
}
newBps.blockStates = make(map[data.BlockPointer]blockState, newLen)
for ptr, bs := range bps.blockStates {
// Only save the good pointers
if !blacklist[ptr] {
newBps.blockStates[ptr] = bs
}
}
return newBps, nil
}