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journal_block_server.go
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/
journal_block_server.go
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// Copyright 2016 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 (
"github.com/keybase/client/go/kbfs/kbfsblock"
"github.com/keybase/client/go/kbfs/kbfscrypto"
"github.com/keybase/client/go/kbfs/tlf"
"github.com/pkg/errors"
"golang.org/x/net/context"
)
type journalBlockServer struct {
jManager *JournalManager
BlockServer
enableAddBlockReference bool
}
var _ BlockServer = journalBlockServer{}
func (j journalBlockServer) getBlockFromJournal(
ctx context.Context, tlfID tlf.ID, id kbfsblock.ID) (
data []byte, serverHalf kbfscrypto.BlockCryptKeyServerHalf,
found bool, err error) {
tlfJournal, ok := j.jManager.getTLFJournal(tlfID, nil)
if !ok {
return nil, kbfscrypto.BlockCryptKeyServerHalf{}, false, nil
}
defer func() {
err = translateToBlockServerError(err)
}()
data, serverHalf, err = tlfJournal.getBlockData(ctx, id)
switch errors.Cause(err).(type) {
case nil:
return data, serverHalf, true, nil
case blockNonExistentError:
return nil, kbfscrypto.BlockCryptKeyServerHalf{}, false, nil
case errTLFJournalDisabled:
return nil, kbfscrypto.BlockCryptKeyServerHalf{}, false, nil
default:
return nil, kbfscrypto.BlockCryptKeyServerHalf{}, false, err
}
}
func (j journalBlockServer) getBlockSizeFromJournal(
ctx context.Context, tlfID tlf.ID, id kbfsblock.ID) (
size uint32, found bool, err error) {
tlfJournal, ok := j.jManager.getTLFJournal(tlfID, nil)
if !ok {
return 0, false, nil
}
defer func() {
err = translateToBlockServerError(err)
}()
size, err = tlfJournal.getBlockSize(ctx, id)
switch errors.Cause(err).(type) {
case nil:
return size, true, nil
case blockNonExistentError:
return 0, false, nil
case errTLFJournalDisabled:
return 0, false, nil
default:
return 0, false, err
}
}
func (j journalBlockServer) Get(
ctx context.Context, tlfID tlf.ID, id kbfsblock.ID,
context kbfsblock.Context, cacheType DiskBlockCacheType) (
data []byte, serverHalf kbfscrypto.BlockCryptKeyServerHalf, err error) {
j.jManager.log.LazyTrace(ctx, "jBServer: Get %s", id)
defer func() {
j.jManager.deferLog.LazyTrace(ctx, "jBServer: Get %s done (err=%v)", id, err)
}()
data, serverHalf, found, err := j.getBlockFromJournal(ctx, tlfID, id)
if err != nil {
return nil, kbfscrypto.BlockCryptKeyServerHalf{}, err
}
if found {
return data, serverHalf, nil
}
return j.BlockServer.Get(ctx, tlfID, id, context, cacheType)
}
func (j journalBlockServer) Put(
ctx context.Context, tlfID tlf.ID, id kbfsblock.ID,
context kbfsblock.Context, buf []byte,
serverHalf kbfscrypto.BlockCryptKeyServerHalf,
cacheType DiskBlockCacheType) (err error) {
// Don't trace this function, as it gets too verbose and is
// called in parallel anyway. Rely on caller (usually
// doBlockPuts) to do the tracing.
if tlfJournal, ok := j.jManager.getTLFJournal(tlfID, nil); ok {
defer func() {
err = translateToBlockServerError(err)
}()
err := tlfJournal.putBlockData(ctx, id, context, buf, serverHalf)
switch e := errors.Cause(err).(type) {
case nil:
usedQuotaBytes, quotaBytes := tlfJournal.getQuotaInfo()
return j.jManager.maybeReturnOverQuotaError(
usedQuotaBytes, quotaBytes)
case errTLFJournalDisabled:
break
case *ErrDiskLimitTimeout:
return j.jManager.maybeMakeDiskLimitErrorReportable(e)
default:
return err
}
}
return j.BlockServer.Put(
ctx, tlfID, id, context, buf, serverHalf, cacheType)
}
func (j journalBlockServer) AddBlockReference(
ctx context.Context, tlfID tlf.ID, id kbfsblock.ID,
context kbfsblock.Context) (err error) {
j.jManager.log.LazyTrace(ctx, "jBServer: AddRef %s", id)
defer func() {
j.jManager.deferLog.LazyTrace(ctx, "jBServer: AddRef %s done (err=%v)", id, err)
}()
if tlfJournal, ok := j.jManager.getTLFJournal(tlfID, nil); ok {
if !j.enableAddBlockReference {
// TODO: Temporarily return an error until KBFS-1149 is
// fixed. This is needed despite
// journalBlockCache.CheckForBlockPtr, since
// CheckForBlockPtr may be called before journaling is
// turned on for a TLF.
return kbfsblock.ServerErrorBlockNonExistent{}
}
defer func() {
err = translateToBlockServerError(err)
}()
err := tlfJournal.addBlockReference(ctx, id, context)
switch errors.Cause(err).(type) {
case nil:
return nil
case errTLFJournalDisabled:
break
default:
return err
}
}
return j.BlockServer.AddBlockReference(ctx, tlfID, id, context)
}
func (j journalBlockServer) RemoveBlockReferences(
ctx context.Context, tlfID tlf.ID,
contexts kbfsblock.ContextMap) (
liveCounts map[kbfsblock.ID]int, err error) {
j.jManager.log.LazyTrace(ctx, "jBServer: RemRef %v", contexts)
defer func() {
j.jManager.deferLog.LazyTrace(ctx, "jBServer: RemRef %v done (err=%v)", contexts, err)
}()
// Deletes always go straight to the server, since they slow down
// the journal and already only happen in the background anyway.
// Note that this means delete operations must be issued after the
// corresponding MD that unreferenced the block was flushed from
// the journal.
return j.BlockServer.RemoveBlockReferences(ctx, tlfID, contexts)
}
func (j journalBlockServer) ArchiveBlockReferences(
ctx context.Context, tlfID tlf.ID,
contexts kbfsblock.ContextMap) (err error) {
j.jManager.log.LazyTrace(ctx, "jBServer: ArchiveRef %v", contexts)
defer func() {
j.jManager.deferLog.LazyTrace(ctx, "jBServer: ArchiveRef %v done (err=%v)", contexts, err)
}()
// Archives always go straight to the server, since they slow down
// the journal and already only happen in the background anyway.
// Note that this means delete operations must be issued after the
// corresponding MD that unreferenced the block was flushed from
// the journal.
return j.BlockServer.ArchiveBlockReferences(ctx, tlfID, contexts)
}
func (j journalBlockServer) IsUnflushed(ctx context.Context, tlfID tlf.ID,
id kbfsblock.ID) (isLocal bool, err error) {
j.jManager.log.LazyTrace(ctx, "jBServer: IsUnflushed %s", id)
defer func() {
j.jManager.deferLog.LazyTrace(ctx, "jBServer: IsUnflushed %s done (err=%v)", id, err)
}()
if tlfJournal, ok := j.jManager.getTLFJournal(tlfID, nil); ok {
defer func() {
err = translateToBlockServerError(err)
}()
return tlfJournal.isBlockUnflushed(ctx, id)
}
return j.BlockServer.IsUnflushed(ctx, tlfID, id)
}
func (j journalBlockServer) Shutdown(ctx context.Context) {
j.jManager.shutdown(ctx)
j.BlockServer.Shutdown(ctx)
}