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store_tcp_server.go
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store_tcp_server.go
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package store
import (
"bufio"
"fmt"
"io"
"net"
"time"
"github.com/chrislusf/glog"
"github.com/chrislusf/vasto/pb"
"github.com/chrislusf/vasto/util"
"github.com/golang/protobuf/proto"
)
// Run starts the heartbeating to master and starts accepting requests.
func (ss *storeServer) serveTcp(listener net.Listener) {
for {
// Listen for an incoming connection.
conn, err := listener.Accept()
if err != nil {
fmt.Println("Error accepting: ", err.Error())
continue
}
// Handle connections in a new goroutine.
go func() {
if err = conn.SetDeadline(time.Time{}); err != nil {
fmt.Printf("Failed to set timeout: %v\n", err)
}
if c, ok := conn.(*net.TCPConn); ok {
c.SetKeepAlive(true)
c.SetNoDelay(true)
c.SetLinger(0)
}
ss.handleConnection(conn)
conn.Close()
}()
}
}
func (ss *storeServer) handleConnection(conn net.Conn) {
reader := bufio.NewReader(conn)
for {
if err := ss.handleRequest(reader, conn); err != nil {
if err != io.EOF {
glog.Errorf("handleRequest: %v", err)
}
return
}
}
}
func (ss *storeServer) handleRequest(reader io.Reader, writer io.Writer) error {
var input, output []byte
var err error
input, err = util.ReadMessage(reader)
if err == io.EOF {
return err
}
if err != nil {
return fmt.Errorf("read message: %v", err)
}
output, err = ss.handleInputOutput(input)
err = util.WriteMessage(writer, output)
if err != nil {
return fmt.Errorf("write message: %v", err)
}
return nil
}
func (ss *storeServer) handleInputOutput(input []byte) (output []byte, err error) {
requests := &pb.Requests{}
if err = proto.Unmarshal(input, requests); err != nil {
return nil, fmt.Errorf("unmarshal: %v", err)
}
responses := &pb.Responses{}
for _, request := range requests.Requests {
response := ss.processRequest(requests.Keyspace, request)
responses.Responses = append(responses.Responses, response)
}
output, err = proto.Marshal(responses)
if err != nil {
return output, fmt.Errorf("marshal: %v", err)
}
return output, err
}
func (ss *storeServer) processRequest(keyspace string, command *pb.Request) *pb.Response {
shard, found := ss.keyspaceShards.getShard(keyspace, VastoShardId(command.ShardId))
if !found {
if command.GetGet() != nil {
return &pb.Response{
Get: &pb.GetResponse{
Ok: false,
Status: fmt.Sprintf("keyspace %s not found", keyspace),
},
}
} else if command.GetPut() != nil {
return &pb.Response{
Write: &pb.WriteResponse{
Ok: false,
Status: fmt.Sprintf("keyspace %s not found", keyspace),
},
}
} else if command.GetMerge() != nil {
return &pb.Response{
Write: &pb.WriteResponse{
Ok: false,
Status: fmt.Sprintf("keyspace %s not found", keyspace),
},
}
} else if command.GetDelete() != nil {
return &pb.Response{
Write: &pb.WriteResponse{
Ok: false,
Status: fmt.Sprintf("keyspace %s not found", keyspace),
},
}
} else if command.GetGetByPrefix() != nil {
return &pb.Response{
GetByPrefix: &pb.GetByPrefixResponse{
Ok: false,
Status: fmt.Sprintf("keyspace %s not found", keyspace),
},
}
}
}
if command.GetGet() != nil {
return &pb.Response{
Get: ss.processGet(shard, command.Get),
}
} else if command.GetPut() != nil {
return &pb.Response{
Write: ss.processPut(shard, command.Put),
}
} else if command.GetMerge() != nil {
return &pb.Response{
Write: ss.processMerge(shard, command.Merge),
}
} else if command.GetDelete() != nil {
return &pb.Response{
Write: ss.processDelete(shard, command.Delete),
}
} else if command.GetGetByPrefix() != nil {
return &pb.Response{
GetByPrefix: ss.processPrefix(shard, command.GetByPrefix),
}
}
return &pb.Response{
Write: &pb.WriteResponse{
Ok: true,
},
}
}