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server.go
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server.go
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// Copyright 2024 Blink Labs Software
//
// 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 keepalive
import (
"fmt"
"github.com/blinklabs-io/gouroboros/protocol"
)
type Server struct {
*protocol.Protocol
config *Config
callbackContext CallbackContext
}
func NewServer(protoOptions protocol.ProtocolOptions, cfg *Config) *Server {
s := &Server{
config: cfg,
}
s.callbackContext = CallbackContext{
Server: s,
ConnectionId: protoOptions.ConnectionId,
}
protoConfig := protocol.ProtocolConfig{
Name: ProtocolName,
ProtocolId: ProtocolId,
Muxer: protoOptions.Muxer,
ErrorChan: protoOptions.ErrorChan,
Mode: protoOptions.Mode,
Role: protocol.ProtocolRoleServer,
MessageHandlerFunc: s.messageHandler,
MessageFromCborFunc: NewMsgFromCbor,
StateMap: StateMap,
InitialState: StateClient,
}
s.Protocol = protocol.New(protoConfig)
return s
}
func (s *Server) messageHandler(msg protocol.Message) error {
var err error
switch msg.Type() {
case MessageTypeKeepAlive:
err = s.handleKeepAlive(msg)
case MessageTypeDone:
err = s.handleDone()
default:
err = fmt.Errorf(
"%s: received unexpected message type %d",
ProtocolName,
msg.Type(),
)
}
return err
}
func (s *Server) handleKeepAlive(msgGeneric protocol.Message) error {
msg := msgGeneric.(*MsgKeepAlive)
if s.config != nil && s.config.KeepAliveFunc != nil {
// Call the user callback function
return s.config.KeepAliveFunc(s.callbackContext, msg.Cookie)
} else {
// Send the keep-alive response
resp := NewMsgKeepAliveResponse(msg.Cookie)
return s.SendMessage(resp)
}
}
func (s *Server) handleDone() error {
if s.config != nil && s.config.DoneFunc != nil {
// Call the user callback function
return s.config.DoneFunc(s.callbackContext)
}
return nil
}