/
extent_reader.go
125 lines (108 loc) · 4.26 KB
/
extent_reader.go
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// Copyright 2018 The Chubao Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package stream
import (
"fmt"
"github.com/chubaofs/chubaofs/proto"
"github.com/chubaofs/chubaofs/sdk/data/wrapper"
"github.com/chubaofs/chubaofs/util"
"github.com/chubaofs/chubaofs/util/errors"
"github.com/chubaofs/chubaofs/util/log"
"hash/crc32"
"net"
)
// ExtentReader defines the struct of the extent reader.
type ExtentReader struct {
inode uint64
key *proto.ExtentKey
dp *wrapper.DataPartition
followerRead bool
}
// NewExtentReader returns a new extent reader.
func NewExtentReader(inode uint64, key *proto.ExtentKey, dp *wrapper.DataPartition, followerRead bool) *ExtentReader {
return &ExtentReader{
inode: inode,
key: key,
dp: dp,
followerRead: followerRead,
}
}
// String returns the string format of the extent reader.
func (reader *ExtentReader) String() (m string) {
return fmt.Sprintf("inode (%v) extentKey(%v)", reader.inode,
reader.key.Marshal())
}
// Read reads the extent request.
func (reader *ExtentReader) Read(req *ExtentRequest) (readBytes int, err error) {
offset := req.FileOffset - int(reader.key.FileOffset) + int(reader.key.ExtentOffset)
size := req.Size
reqPacket := NewReadPacket(reader.key, offset, size, reader.inode, req.FileOffset, reader.followerRead)
sc := NewStreamConn(reader.dp, reader.followerRead)
log.LogDebugf("ExtentReader Read enter: size(%v) req(%v) reqPacket(%v)", size, req, reqPacket)
err = sc.Send(reqPacket, func(conn *net.TCPConn) (error, bool) {
readBytes = 0
for readBytes < size {
replyPacket := NewReply(reqPacket.ReqID, reader.dp.PartitionID, reqPacket.ExtentID)
bufSize := util.Min(util.ReadBlockSize, size-readBytes)
replyPacket.Data = req.Data[readBytes : readBytes+bufSize]
e := replyPacket.readFromConn(conn, proto.ReadDeadlineTime)
if e != nil {
log.LogWarnf("Extent Reader Read: failed to read from connect, ino(%v) req(%v) readBytes(%v) err(%v)", reader.inode, reqPacket, readBytes, e)
// Upon receiving TryOtherAddrError, other hosts will be retried.
return TryOtherAddrError, false
}
//log.LogDebugf("ExtentReader Read: ResultCode(%v) req(%v) reply(%v) readBytes(%v)", replyPacket.GetResultMsg(), reqPacket, replyPacket, readBytes)
if replyPacket.ResultCode == proto.OpAgain {
return nil, true
}
e = reader.checkStreamReply(reqPacket, replyPacket)
if e != nil {
// Dont change the error message, since the caller will
// check if it is NotLeaderErr.
return e, false
}
readBytes += int(replyPacket.Size)
}
return nil, false
})
if err != nil {
log.LogErrorf("Extent Reader Read: err(%v) req(%v) reqPacket(%v)", err, req, reqPacket)
}
log.LogDebugf("ExtentReader Read exit: req(%v) reqPacket(%v) readBytes(%v) err(%v)", req, reqPacket, readBytes, err)
return
}
func (reader *ExtentReader) checkStreamReply(request *Packet, reply *Packet) (err error) {
if reply.ResultCode == proto.OpTryOtherAddr {
return TryOtherAddrError
}
if reply.ResultCode != proto.OpOk {
if request.Opcode == proto.OpStreamFollowerRead {
log.LogWarnf("checkStreamReply: ResultCode(%v) NOK, OpStreamFollowerRead return TryOtherAddrError, "+
"req(%v) reply(%v)", reply.GetResultMsg(), request, reply)
return TryOtherAddrError
}
err = errors.New(fmt.Sprintf("checkStreamReply: ResultCode(%v) NOK", reply.GetResultMsg()))
return
}
if !request.isValidReadReply(reply) {
err = errors.New(fmt.Sprintf("checkStreamReply: inconsistent req and reply, req(%v) reply(%v)", request, reply))
return
}
expectCrc := crc32.ChecksumIEEE(reply.Data[:reply.Size])
if reply.CRC != expectCrc {
err = errors.New(fmt.Sprintf("checkStreamReply: inconsistent CRC, expectCRC(%v) replyCRC(%v)", expectCrc, reply.CRC))
return
}
return nil
}