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package filer
import (
"bytes"
"fmt"
"github.com/chrislusf/seaweedfs/weed/wdclient"
"io"
"math"
"time"
"github.com/golang/protobuf/proto"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
const (
ManifestBatch = 1000
)
func HasChunkManifest(chunks []*filer_pb.FileChunk) bool {
for _, chunk := range chunks {
if chunk.IsChunkManifest {
return true
}
}
return false
}
func SeparateManifestChunks(chunks []*filer_pb.FileChunk) (manifestChunks, nonManifestChunks []*filer_pb.FileChunk) {
for _, c := range chunks {
if c.IsChunkManifest {
manifestChunks = append(manifestChunks, c)
} else {
nonManifestChunks = append(nonManifestChunks, c)
}
}
return
}
func ResolveChunkManifest(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) (dataChunks, manifestChunks []*filer_pb.FileChunk, manifestResolveErr error) {
// TODO maybe parallel this
for _, chunk := range chunks {
if !chunk.IsChunkManifest {
dataChunks = append(dataChunks, chunk)
continue
}
resolvedChunks, err := ResolveOneChunkManifest(lookupFileIdFn, chunk)
if err != nil {
return chunks, nil, err
}
manifestChunks = append(manifestChunks, chunk)
// recursive
dchunks, mchunks, subErr := ResolveChunkManifest(lookupFileIdFn, resolvedChunks)
if subErr != nil {
return chunks, nil, subErr
}
dataChunks = append(dataChunks, dchunks...)
manifestChunks = append(manifestChunks, mchunks...)
}
return
}
func ResolveOneChunkManifest(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunk *filer_pb.FileChunk) (dataChunks []*filer_pb.FileChunk, manifestResolveErr error) {
if !chunk.IsChunkManifest {
return
}
// IsChunkManifest
data, err := fetchChunk(lookupFileIdFn, chunk.GetFileIdString(), chunk.CipherKey, chunk.IsCompressed)
if err != nil {
return nil, fmt.Errorf("fail to read manifest %s: %v", chunk.GetFileIdString(), err)
}
m := &filer_pb.FileChunkManifest{}
if err := proto.Unmarshal(data, m); err != nil {
return nil, fmt.Errorf("fail to unmarshal manifest %s: %v", chunk.GetFileIdString(), err)
}
// recursive
filer_pb.AfterEntryDeserialization(m.Chunks)
return m.Chunks, nil
}
// TODO fetch from cache for weed mount?
func fetchChunk(lookupFileIdFn wdclient.LookupFileIdFunctionType, fileId string, cipherKey []byte, isGzipped bool) ([]byte, error) {
urlStrings, err := lookupFileIdFn(fileId)
if err != nil {
glog.Errorf("operation LookupFileId %s failed, err: %v", fileId, err)
return nil, err
}
return retriedFetchChunkData(urlStrings, cipherKey, isGzipped, true, 0, 0)
}
func retriedFetchChunkData(urlStrings []string, cipherKey []byte, isGzipped bool, isFullChunk bool, offset int64, size int) ([]byte, error) {
var err error
var buffer bytes.Buffer
var shouldRetry bool
for waitTime := time.Second; waitTime < util.RetryWaitTime; waitTime += waitTime / 2 {
for _, urlString := range urlStrings {
shouldRetry, err = util.ReadUrlAsStream(urlString+"?readDeleted=true", cipherKey, isGzipped, isFullChunk, offset, size, func(data []byte) {
buffer.Write(data)
})
if !shouldRetry {
break
}
if err != nil {
glog.V(0).Infof("read %s failed, err: %v", urlString, err)
buffer.Reset()
} else {
break
}
}
if err != nil && shouldRetry {
glog.V(0).Infof("retry reading in %v", waitTime)
time.Sleep(waitTime)
} else {
break
}
}
return buffer.Bytes(), err
}
func MaybeManifestize(saveFunc SaveDataAsChunkFunctionType, inputChunks []*filer_pb.FileChunk) (chunks []*filer_pb.FileChunk, err error) {
return doMaybeManifestize(saveFunc, inputChunks, ManifestBatch, mergeIntoManifest)
}
func doMaybeManifestize(saveFunc SaveDataAsChunkFunctionType, inputChunks []*filer_pb.FileChunk, mergeFactor int, mergefn func(saveFunc SaveDataAsChunkFunctionType, dataChunks []*filer_pb.FileChunk) (manifestChunk *filer_pb.FileChunk, err error)) (chunks []*filer_pb.FileChunk, err error) {
var dataChunks []*filer_pb.FileChunk
for _, chunk := range inputChunks {
if !chunk.IsChunkManifest {
dataChunks = append(dataChunks, chunk)
} else {
chunks = append(chunks, chunk)
}
}
remaining := len(dataChunks)
for i := 0; i+mergeFactor <= len(dataChunks); i += mergeFactor {
chunk, err := mergefn(saveFunc, dataChunks[i:i+mergeFactor])
if err != nil {
return dataChunks, err
}
chunks = append(chunks, chunk)
remaining -= mergeFactor
}
// remaining
for i := len(dataChunks) - remaining; i < len(dataChunks); i++ {
chunks = append(chunks, dataChunks[i])
}
return
}
func mergeIntoManifest(saveFunc SaveDataAsChunkFunctionType, dataChunks []*filer_pb.FileChunk) (manifestChunk *filer_pb.FileChunk, err error) {
filer_pb.BeforeEntrySerialization(dataChunks)
// create and serialize the manifest
data, serErr := proto.Marshal(&filer_pb.FileChunkManifest{
Chunks: dataChunks,
})
if serErr != nil {
return nil, fmt.Errorf("serializing manifest: %v", serErr)
}
minOffset, maxOffset := int64(math.MaxInt64), int64(math.MinInt64)
for _, chunk := range dataChunks {
if minOffset > int64(chunk.Offset) {
minOffset = chunk.Offset
}
if maxOffset < int64(chunk.Size)+chunk.Offset {
maxOffset = int64(chunk.Size) + chunk.Offset
}
}
manifestChunk, _, _, err = saveFunc(bytes.NewReader(data), "", 0)
if err != nil {
return nil, err
}
manifestChunk.IsChunkManifest = true
manifestChunk.Offset = minOffset
manifestChunk.Size = uint64(maxOffset - minOffset)
return
}
type SaveDataAsChunkFunctionType func(reader io.Reader, name string, offset int64) (chunk *filer_pb.FileChunk, collection, replication string, err error)
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