Minecraft Server List Ping library written in Go.
package main
import (
"fmt"
"github.com/altea-minecraft/minequery/ping"
)
func main() {
res, err := ping.Ping("altea.land", 25565)
if err != nil {
panic(err)
}
fmt.Println(res.Description.Text)
}
When running pings in coroutines after a few "threads" finish i get this error/panic:
![panic: runtime error: slice bounds out of range [-1:]](https://avatars.githubusercontent.com/u/85793326?v=4)
panic: runtime error: slice bounds out of range [-3:]
goroutine 183 [running]:
github.com/dreamscached/minequery/v2.(*Pinger).ping17ReadStatusResponsePacketPayload(0xc0000564a0?, {0x2673ea66f98, 0xc0065da1c0})
C:/Users/Sandbox/go/pkg/mod/github.com/dreamscached/minequery/[email protected]/ping_17.go:1841 +0x525
This is my code:
var wg sync.WaitGroup
var pingout []minequery.Status17
for i, data := range payload {
wg.Add(1)
go func(data Data, i int) {
defer wg.Done()
res, err := minequery.Ping17(data.IP, data.Ports[0].Port)
if err != nil { fmt.Printf("[%d -> %s] (Failed) %s\n", i, data.IP, err); return }
pingout = append(pingout, *res)
}(data, i)
}
wg.Wait()
Hello, i run a velocity 3.1 server.
When i try to use the example in the README, i get:
panic: ping error: response error: expected packet 0x0 but got 0x1 instead
Current implementation of Query creates a new session for each request; ideally this has to be done with session pool of some sort per documentation at wiki.vg
Spigot 1.4 servers (unlike CraftBukkit and Vanilla) reply with 1.6 response, which include 5 and not 3 fields, and uses \0\0 separator instead of §.
Documentation on wiki.vg, however, doesn't mention it; in addition to that, Minecraft client 1.4.7 easily handles both responses, both from Spigot and Vanilla/Bukkit implementations of server.
So if server doesn't respond, we just staying locked.
See https://github.com/alteamc/minequery/blob/0902c57917dc366ee7e8fe4750c73942234f3b83/ping/ping.go#L16
// PingWithTimeout performs a Server List Ping interaction with modern (1.7 and newer) Minecraft server running on the specified host and the specified port with
// read and write timeout.
func PingWithTimeout(host string, port uint16, timeout time.Duration) (*Response, error) {
// ...
res, err := sendServerListPing(conn, host, port)
if err != nil {
return nil, fmt.Errorf("ping error: %w", err)
}
// ...
}
Although it is stated on the Server List Ping wiki page that one can ignore the description length, ignoring it and waiting for the connection to close results in a delay due to internal call to io.ReadAll function. This PR resolves this issue.
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