/
status.go
98 lines (86 loc) · 2.35 KB
/
status.go
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// Copyright 2015 Matthew Collins
//
// 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 protocol
import (
"fmt"
"time"
"github.com/thinkofdeath/steven/format"
)
// StatusReply is the reply retrieved from a server when pinging
// it.
type StatusReply struct {
Version struct {
Name string `json:"name"`
Protocol int `json:"protocol"`
} `json:"version"`
Players struct {
Max int `json:"max"`
Online int `json:"online"`
Sample []StatusPlayer `json:"sample,omitempty"`
} `json:"players"`
Description format.AnyComponent `json:"description"`
Favicon string `json:"favicon"`
}
// StatusPlayer is one of the sample players in a StatusReply
type StatusPlayer struct {
Name string `json:"name"`
ID string `json:"id"`
}
// RequestStatus starts a status request to the server and
// returns the results of the request. The connection will
// be closed after this request.
func (c *Conn) RequestStatus() (response StatusReply, ping time.Duration, err error) {
defer c.Close()
err = c.WritePacket(&Handshake{
ProtocolVersion: SupportedProtocolVersion,
Host: c.host,
Port: c.port,
Next: VarInt(Status - 1),
})
if err != nil {
return
}
c.State = Status
if err = c.WritePacket(&StatusRequest{}); err != nil {
return
}
// Get the reply
var packet Packet
if packet, err = c.ReadPacket(); err != nil {
return
}
resp, ok := packet.(*StatusResponse)
if !ok {
err = fmt.Errorf("unexpected packet %#v", packet)
return
}
response = resp.Status
t := time.Now()
if err = c.WritePacket(&StatusPing{
Time: t.UnixNano(),
}); err != nil {
return
}
// Get the pong reply
packet, err = c.ReadPacket()
if err != nil {
return
}
_, ok = packet.(*StatusPong)
if !ok {
err = fmt.Errorf("unexpected packet %#v", packet)
}
ping = time.Now().Sub(t)
return
}