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client.go
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client.go
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// Copyright 2021 PairMesh, Inc.
//
// 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 relay
import (
"context"
"errors"
"fmt"
"time"
"github.com/pairmesh/pairmesh/message"
"go.uber.org/atomic"
"go.uber.org/zap"
"google.golang.org/protobuf/proto"
)
// Client represents the relay server client which is used to interactive with relay server.
type Client struct {
ClientTransporter
handler ClientHandler
latency time.Duration
closed *atomic.Bool
onClosed func() // Callback function
}
// NewClient returns a new client instance.
func NewClient(transporter ClientTransporter) *Client {
c := &Client{
ClientTransporter: transporter,
closed: atomic.NewBool(false),
handler: NewClientHandler(),
}
return c
}
func (c *Client) SetLatency(lat time.Duration) {
c.latency = lat
}
func (c *Client) Handler() ClientHandler {
return c.handler
}
func (c *Client) Send(typ message.PacketType, msg proto.Message) error {
if c.closed.Load() {
return errors.New("cannot send message to closed client")
}
select {
case c.WriteQueue() <- Packet{Type: typ, Message: msg}:
return nil
default:
return fmt.Errorf("send buffer exceeded: %s:%d", c.RelayServer().Host, c.RelayServer().Port)
}
}
func (c *Client) Serve(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
case p, ok := <-c.ReadQueue():
if !ok {
return
}
err := c.handler.Handle(c, p)
if err != nil {
zap.L().Error("Handle relay message failed", zap.Stringer("type", p.Type), zap.Error(err))
continue
}
}
}
}
func (c *Client) OnClosed(cb func()) {
c.onClosed = cb
}
func (c *Client) Close() error {
if c.closed.Swap(true) {
return errors.New("close a closed client")
}
if err := c.ClientTransporter.Close(); err != nil {
return err
}
if c.onClosed != nil {
c.onClosed()
}
return nil
}