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package weed_server
import (
"bufio"
"fmt"
"io"
"net"
"strings"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/util"
)
func (vs *VolumeServer) HandleTcpConnection(c net.Conn) {
defer c.Close()
glog.V(0).Infof("Serving writes from %s", c.RemoteAddr().String())
bufReader := bufio.NewReaderSize(c, 1024*1024)
bufWriter := bufio.NewWriterSize(c, 1024*1024)
for {
cmd, err := bufReader.ReadString('\n')
if err != nil {
if err != io.EOF {
glog.Errorf("read command from %s: %v", c.RemoteAddr().String(), err)
}
return
}
cmd = cmd[:len(cmd)-1]
switch cmd[0] {
case '+':
fileId := cmd[1:]
err = vs.handleTcpPut(fileId, bufReader)
if err == nil {
bufWriter.Write([]byte("+OK\n"))
} else {
bufWriter.Write([]byte("-ERR " + string(err.Error()) + "\n"))
}
case '-':
fileId := cmd[1:]
err = vs.handleTcpDelete(fileId)
if err == nil {
bufWriter.Write([]byte("+OK\n"))
} else {
bufWriter.Write([]byte("-ERR " + string(err.Error()) + "\n"))
}
case '?':
fileId := cmd[1:]
err = vs.handleTcpGet(fileId, bufWriter)
case '!':
bufWriter.Flush()
}
}
}
func (vs *VolumeServer) handleTcpGet(fileId string, writer *bufio.Writer) (err error) {
volumeId, n, err2 := vs.parseFileId(fileId)
if err2 != nil {
return err2
}
volume := vs.store.GetVolume(volumeId)
if volume == nil {
return fmt.Errorf("volume %d not found", volumeId)
}
err = volume.StreamRead(n, writer)
if err != nil {
return err
}
return nil
}
func (vs *VolumeServer) handleTcpPut(fileId string, bufReader *bufio.Reader) (err error) {
volumeId, n, err2 := vs.parseFileId(fileId)
if err2 != nil {
return err2
}
volume := vs.store.GetVolume(volumeId)
if volume == nil {
return fmt.Errorf("volume %d not found", volumeId)
}
sizeBuf := make([]byte, 4)
if _, err = bufReader.Read(sizeBuf); err != nil {
return err
}
dataSize := util.BytesToUint32(sizeBuf)
err = volume.StreamWrite(n, bufReader, dataSize)
if err != nil {
return err
}
return nil
}
func (vs *VolumeServer) handleTcpDelete(fileId string) (err error) {
volumeId, n, err2 := vs.parseFileId(fileId)
if err2 != nil {
return err2
}
_, err = vs.store.DeleteVolumeNeedle(volumeId, n)
if err != nil {
return err
}
return nil
}
func (vs *VolumeServer) parseFileId(fileId string) (needle.VolumeId, *needle.Needle, error) {
commaIndex := strings.LastIndex(fileId, ",")
if commaIndex <= 0 {
return 0, nil, fmt.Errorf("unknown fileId %s", fileId)
}
vid, fid := fileId[0:commaIndex], fileId[commaIndex+1:]
volumeId, ve := needle.NewVolumeId(vid)
if ve != nil {
return 0, nil, fmt.Errorf("unknown volume id in fileId %s", fileId)
}
n := new(needle.Needle)
n.ParsePath(fid)
return volumeId, n, nil
}
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