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server.go
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server.go
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package distribution
import (
"fmt"
"github.com/elliotcourant/arkdb/pkg/transport"
"github.com/elliotcourant/arkdb/pkg/transportwrapper"
"github.com/elliotcourant/arkdb/pkg/wire"
"github.com/elliotcourant/timber"
"io"
"net"
)
type masterServer struct {
boat *boat
logger timber.Logger
ln transportwrapper.TransportWrapper
}
func (i *masterServer) runMasterServer() {
go func(i *masterServer) {
t := i.ln.NormalTransport()
for {
conn, err := t.Accept()
if err != nil && !i.boat.IsStopped() {
i.logger.Errorf("failed to accept connection: %v", err)
}
if !i.boat.IsStopped() {
go func(i *masterServer, conn net.Conn) {
if err := i.handleMasterConn(conn); err != nil {
i.logger.Errorf("failed to handle connection: %v", err)
}
}(i, conn)
} else {
return
}
}
}(i)
}
func (i *masterServer) handleMasterConn(conn net.Conn) error {
w := wire.NewServerWire(conn, conn)
receivedMsg, err := w.Receive()
if err != nil {
return err
}
switch msg := receivedMsg.(type) {
case *wire.HandshakeRequest:
switch msg.Intention {
case wire.RaftIntention:
if err := w.Send(&wire.HandshakeResponse{}); err != nil {
return err
}
i.ln.ForwardToRaft(conn, nil)
case wire.RpcIntention:
if err := w.Send(&wire.HandshakeResponse{}); err != nil {
return err
}
i.ln.ForwardToRpc(conn, nil)
default:
e := fmt.Errorf("invalid intention received [%d]", msg.Intention)
if err := w.Send(&wire.ErrorResponse{
Error: e,
}); err != nil {
return err
}
return e
}
default:
return fmt.Errorf("invalid startup message received [%T]", msg)
}
return nil
}
type boatServer struct {
boat *boat
logger timber.Logger
ln transport.Transport
}
func (i *boatServer) runBoatServer() {
go func(i *boatServer) {
for {
conn, err := i.ln.Accept()
if err != nil {
i.logger.Errorf("failed to accept connection: %v", err)
}
go func(i *boatServer, conn net.Conn) {
if err := i.handleConn(conn); err != nil && err != io.EOF {
i.logger.Errorf("failed to handle connection: %v", err)
}
}(i, conn)
}
}(i)
}
func (i *boatServer) handleConn(conn net.Conn) error {
r := wire.NewRpcServerWire(conn, conn)
for {
receivedMsg, err := r.Receive()
if err != nil {
return err
}
switch msg := receivedMsg.(type) {
case *wire.ApplyTransactionRequest:
i.logger.Verbosef("received apply transaction request from [%s]", msg.NodeID)
e := i.boat.apply(*msg.Transaction, nil)
if e != nil {
if err := r.Send(&wire.ErrorResponse{
Error: e,
}); err != nil {
return err
}
} else {
if err := r.Send(&wire.ApplyTransactionResponse{}); err != nil {
return err
}
}
case *wire.DiscoveryRequest:
myNodeId, newNode := i.boat.nodeId, i.boat.newNode
response := &wire.DiscoveryResponse{
NodeID: myNodeId.RaftID(),
IsNewNode: newNode,
}
if err := r.Send(response); err != nil {
return err
}
case *wire.NextObjectIdRequest:
val, e := i.boat.NextObjectID(msg.ObjectPath)
if e != nil {
if err := r.Send(&wire.ErrorResponse{
Error: e,
}); err != nil {
return err
}
} else {
if err := r.Send(&wire.NextObjectIdResponse{
Identity: val,
}); err != nil {
return err
}
}
default:
e := fmt.Errorf("invalid rpc message received [%d]", msg)
if err := r.Send(&wire.ErrorResponse{
Error: e,
}); err != nil {
return err
}
return e
}
}
}