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Refactor server modules into main package and improve error handling

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adman
2026-02-24 23:27:56 +01:00
parent 85529b965b
commit bd83b9689e
18 changed files with 137 additions and 508 deletions
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LICENSE
+37 -178
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@@ -1,202 +1,61 @@
Copyright © 2007 Free Software Foundation, Inc. <https://fsf.org/>
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Version 2.0, January 2004
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Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
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client/client.go
+1
View File
@@ -7,6 +7,7 @@ import (
"github.com/admin-else/strom/proto_base"
)
// Connect connects to the given address note that it does not resolve the SRV records its just a raw net.Dial
func Connect(addr string) (ret *proto.Conn, err error) {
ret = &proto.Conn{}
err = ret.SetVersion("1.21.8")
client/modules/config_ignorer.go
+4 -3
View File
@@ -3,6 +3,7 @@ package modules
import (
"errors"
"fmt"
"log/slog"
"github.com/admin-else/strom/event"
"github.com/admin-else/strom/proto"
@@ -14,8 +15,8 @@ type ConfigIgnorer struct {
*proto.Conn
}
func (c *ConfigIgnorer) Default(event any) (err error) {
fmt.Printf("%#v\n", event)
func (c *ConfigIgnorer) Default(event event.Anything) (err error) {
slog.Debug("Config ignorer", "packet", fmt.Sprintf("%#v", event))
return
}
@@ -23,7 +24,7 @@ func (c *ConfigIgnorer) OnKnownPacks(packet *v1_21_8.ConfigurationToClientPacket
return c.Send(&v1_21_8.ConfigurationToServerPacketCommonSelectKnownPacks{Packs: packet.Packs})
}
func (c *ConfigIgnorer) OnFinish(_ v1_21_8.ConfigurationToClientPacketFinishConfiguration) (err error) {
func (c *ConfigIgnorer) OnFinish(_ *v1_21_8.ConfigurationToClientPacketFinishConfiguration) (err error) {
err = c.Send(&v1_21_8.ConfigurationToServerPacketFinishConfiguration{})
if err != nil {
return
client/modules/status.go
+2 -2
View File
@@ -25,7 +25,7 @@ func (s *StatusClient) Default(event any) (err error) {
func (s *StatusClient) OnStart(_ event.OnStart) (err error) {
parts := strings.Split(s.RemoteAddr().String(), ":")
versionData, err := data.LookUpProtocolVersionByName(s.Version)
versionData, err := data.LookUpVersionByName(s.Version)
if err != nil {
return
}
@@ -34,7 +34,7 @@ func (s *StatusClient) OnStart(_ event.OnStart) (err error) {
return
}
err = s.Send(&v1_21_8.HandshakingToServerPacketSetProtocol{
ProtocolVersion: int32(versionData.Version),
ProtocolVersion: versionData.Version,
ServerHost: parts[0],
ServerPort: uint16(port),
NextState: int32(proto_base.Status),
data/protocol_version.go
+5 -5
View File
@@ -9,18 +9,18 @@ package data
// "releaseType": "snapshot"
// },
type ProtocolVersion struct {
type VersionInfo struct {
MinecraftVersion string
Version int
Version int32
DataVersion int
UsesNetty bool
MajorVersion string
ReleaseType string
}
var ProtocolVersions []ProtocolVersion
var ProtocolVersions []VersionInfo
func LookUpProtocolVersionByName(name string) (ret ProtocolVersion, err error) {
func LookUpVersionByName(name string) (ret VersionInfo, err error) {
for _, v := range ProtocolVersions {
if v.MinecraftVersion == name {
ret = v
@@ -31,7 +31,7 @@ func LookUpProtocolVersionByName(name string) (ret ProtocolVersion, err error) {
return
}
func LookUpProtocolVersionByVersion(version int) (ret ProtocolVersion, err error) {
func LookUpVersionByProtocolVersion(version int32) (ret VersionInfo, err error) {
for _, v := range ProtocolVersions {
if v.Version == version {
ret = v
data/protocol_version_test.go
+1 -1
View File
@@ -7,7 +7,7 @@ import (
)
func TestLookUpProtocolVersion(t *testing.T) {
version, err := data.LookUpProtocolVersionByVersion(772)
version, err := data.LookUpVersionByProtocolVersion(772)
if err != nil {
t.Fatalf("Expected to find version 772, got error: %v", err)
}
event/event_bus.go
+3 -3
View File
@@ -44,8 +44,8 @@ func (e HandlerDoneErr) Unwrap() error {
// ErrDontForward will stop the event from being forwarded to other handlers, including anything handlers.
var ErrDontForward = errors.New("dont forward")
// FindHandlers initializes and populates the HandlerFunctions map by reflecting over methods of registered handlers.
func (l *Loop) FindHandlers() {
// SetHandlerFunctions initializes and populates the HandlerFunctions map by reflecting over methods of registered handlers.
func (l *Loop) SetHandlerFunctions() {
l.HandlerFunctions = make(map[reflect.Type][]reflect.Value)
for _, inst := range l.Handlers {
t := reflect.TypeOf(inst)
@@ -104,7 +104,7 @@ func (l *Loop) Fire(event any) (err error) {
func (l *Loop) Start() (err error) {
_ = *l // exit early on nil connection
l.FindHandlers()
l.SetHandlerFunctions()
err = l.Fire(OnStart{})
for err == nil {
err = l.Fire(Tick{})
go.work
-8
View File
@@ -1,8 +0,0 @@
go 1.25
use (
.devres/examples/ishacking
.
.devres/examples/ishackingapis
.devres/examples/testmod
)
nbt/nbt.go
+2 -2
View File
@@ -62,7 +62,7 @@ func (s *Anon) Encode(w io.Writer) (err error) {
return
}
func (s *Tag) Read(r io.Reader) (err error) {
func (s *Tag) Decode(r io.Reader) (err error) {
id := int8(0)
err = binary.Read(r, Order, &id)
if err != nil {
@@ -81,7 +81,7 @@ func (s *Tag) Read(r io.Reader) (err error) {
return
}
func (s *Tag) Write(w io.Writer) (err error) {
func (s *Tag) Encode(w io.Writer) (err error) {
id, err := getId(s.Value)
if err != nil {
return
proto/connection.go
+6 -1
View File
@@ -3,7 +3,9 @@ package proto
import (
"bytes"
"errors"
"fmt"
"io"
"log/slog"
"sync"
"github.com/admin-else/strom/data"
@@ -56,7 +58,7 @@ func (c *Conn) State() proto_base.State {
func (c *Conn) SetVersion(version string) (err error) {
c.Version = version
versionData, err := data.LookUpProtocolVersionByName(c.Version)
versionData, err := data.LookUpVersionByName(c.Version)
if err != nil {
return
}
@@ -122,6 +124,7 @@ func (c *Conn) OnTick(_ event.Tick) (err error) {
if err != nil {
return
}
slog.Debug("packet", "actor", c.Actor, "packet", fmt.Sprintf("%#v", packet))
err = c.Loop.Fire(packet)
return
}
@@ -131,5 +134,7 @@ func (c *Conn) Start(handlers ...any) (err error) {
c.Handlers = append(c.Handlers, c)
c.Handlers = append(c.Handlers, handlers...)
err = c.Loop.Start()
c.Handlers = c.Handlers[:len(c.Handlers)-len(handlers)]
c.Loop.SetHandlerFunctions()
return
}
proto_base/base_types.go
+11 -6
View File
@@ -45,6 +45,17 @@ const (
Client
)
func (a Actor) String() string {
switch a {
case Servee:
return "Servee"
case Client:
return "Client"
default:
return "Unknown"
}
}
func (a Actor) SendDirection() Direction {
switch a {
case Servee:
@@ -67,12 +78,6 @@ func (a Actor) ReceiveDirection() Direction {
}
}
type PacketIdentifier struct {
Direction Direction
State State
Name string
}
type (
ToDo struct{}
RestBuffer []byte
proto_generator/main.go
+2 -2
View File
@@ -247,7 +247,7 @@ func (g *Generator) GenerateTypes(prefix string, types Types) (err error) {
}
func (g *Generator) GenerateProtocol(protocol Protocol, version string) (err error) {
versionData, err := data.LookUpProtocolVersionByName(version)
versionData, err := data.LookUpVersionByName(version)
if err != nil {
return
}
@@ -298,7 +298,7 @@ func (g *Generator) GenerateProtocol(protocol Protocol, version string) (err err
Direction: types.Direction,
State: types.State,
PacketId: packetIdsRev[k2],
ProtocolVersion: strconv.Itoa(versionData.Version),
ProtocolVersion: strconv.Itoa(int(versionData.Version)),
MinecraftVersion: version,
})
}
server/server.go
+7 -3
View File
@@ -6,7 +6,6 @@ import (
"github.com/admin-else/strom/proto"
"github.com/admin-else/strom/proto_base"
"github.com/admin-else/strom/server/server_modules"
"github.com/admin-else/strom/text"
)
@@ -43,7 +42,12 @@ func StartServerWithFactory(listenAddr string, factory func(c *proto.Conn) (h an
if err != nil {
return
}
go ServeClient(cNet, factory)
go func() {
err := ServeClient(cNet, factory)
if err != nil {
slog.Error("error while serving client", "error", err, "client", cNet.RemoteAddr())
}
}()
}
}
@@ -67,7 +71,7 @@ func StartServerWithOnConn(listenAddr string, onConn func(c *proto.Conn) (err er
return // we dont care about status packets
}
slog.Error("Error while handling client", "error", connErr, "client", c.Conn.RemoteAddr())
connErr = server_modules.Kick(c, text.Pretty(connErr.Error()))
connErr = Kick(c, text.Pretty(connErr.Error()))
if connErr != nil {
slog.Error("Error while kicking client", "error", connErr, "client", c.Conn.RemoteAddr())
}
server/server_modules/kicker.go
-39
View File
@@ -1,39 +0,0 @@
package server_modules
import (
"errors"
"github.com/admin-else/strom/nbt"
"github.com/admin-else/strom/proto"
"github.com/admin-else/strom/proto_base"
"github.com/admin-else/strom/proto_generated/v1_21_8"
"github.com/admin-else/strom/text"
)
var (
NotClientErr = errors.New("not a servee")
CantKickInStateErr = errors.New("cant kick in this state")
)
func Kick(c *proto.Conn, reason *text.Component) (err error) {
if c.Actor != proto_base.Servee {
err = NotClientErr
return
}
switch c.State() {
case proto_base.Handshaking, proto_base.Status:
err = CantKickInStateErr
case proto_base.Login:
var b []byte
b, err = reason.MarshalJSON()
if err != nil {
return
}
err = c.Send(&v1_21_8.LoginToClientPacketDisconnect{Reason: string(b)})
case proto_base.Configuration:
err = c.Send(&v1_21_8.ConfigurationToClientPacketDisconnect{Reason: nbt.Anon{Value: reason.ToNBT()}})
case proto_base.Play:
err = c.Send(&v1_21_8.PlayToClientPacketKickDisconnect{Reason: nbt.Anon{Value: reason.ToNBT()}})
}
return
}
server/server_modules/login_server.go
-181
View File
@@ -1,181 +0,0 @@
package server_modules
import (
"encoding/json"
"errors"
"fmt"
"log/slog"
"slices"
"github.com/admin-else/strom/api"
"github.com/admin-else/strom/event"
"github.com/admin-else/strom/proto"
"github.com/admin-else/strom/proto_base"
"github.com/admin-else/strom/proto_generated/v1_21_8"
"github.com/google/uuid"
)
var StatusServedError = errors.New("status served")
var UnexpectedStatusRequest = UnexpectedNextStateError{proto_base.Status}
type NameAndUUID struct {
Name string
UUID uuid.UUID
}
type UnexpectedNextStateError struct {
NextState proto_base.State
}
func (u UnexpectedNextStateError) Error() string {
return fmt.Sprintf("unexpected next state: %v", u.NextState)
}
type LoginServer struct {
*proto.Conn
//OnlineMode bool FIXME: implement this
ServerHost string
ServerPort uint16
Requested NameAndUUID
Given *NameAndUUID
CompressionThreshold int32
Status []byte
CompatibleVersions []int32
}
func (l *LoginServer) OnHandshake(packet *v1_21_8.HandshakingToServerPacketSetProtocol) (err error) {
l.SetState(proto_base.State(packet.NextState))
l.ServerHost = packet.ServerHost
l.ServerPort = packet.ServerPort
if packet.NextState != int32(proto_base.Login) && !(l.Status != nil && packet.NextState == int32(proto_base.Status)) {
err = UnexpectedNextStateError{proto_base.State(packet.NextState)}
}
if len(l.CompatibleVersions) != 0 {
if !slices.Contains(l.CompatibleVersions, packet.ProtocolVersion) {
err = fmt.Errorf("incompatible protocol version please use one of %v you can look up the real coresponding version at https://minecraft.wiki/w/Minecraft_Wiki:Projects/wiki.vg_merge/Protocol_version_numbers", l.CompatibleVersions)
return
}
}
return
}
func (l *LoginServer) OnStatusRequest(_ *v1_21_8.StatusToServerPacketPingStart) (err error) {
err = l.Send(&v1_21_8.StatusToClientPacketServerInfo{Response: string(l.Status)})
return
}
func (l *LoginServer) OnStatusPing(packet *v1_21_8.StatusToServerPacketPing) (err error) {
err = l.Send(&v1_21_8.StatusToClientPacketPing{Time: packet.Time})
if err != nil {
return
}
return event.HandlerDoneErr{Return: StatusServedError}
}
func (l *LoginServer) SetCompressionThreshold(threshold int32) (err error) {
err = l.Send(&v1_21_8.LoginToClientPacketCompress{Threshold: threshold})
if err != nil {
return
}
l.CompressionThreshold = threshold
return
}
func (l *LoginServer) OnLoginStart(packet *v1_21_8.LoginToServerPacketLoginStart) (err error) {
l.Requested = NameAndUUID{packet.Username, packet.PlayerUUID}
//err = l.SetCompressionThreshold(l.CompressionThreshold)
//if err != nil {
// return
//}
if l.Given == nil {
l.Given = &l.Requested
}
err = l.Send(&v1_21_8.LoginToClientPacketSuccess{
Uuid: l.Given.UUID,
Username: l.Given.Name,
Properties: nil,
})
return
}
func (l *LoginServer) OnLoginAcknowledged(_ *v1_21_8.LoginToServerPacketLoginAcknowledged) (err error) {
l.SetState(proto_base.Configuration)
err = event.HandlerDoneErr{}
return
}
func (l *LoginServer) OnDefault(event event.Unhandled) (err error) {
err = fmt.Errorf("unexpected event during login: %#v", event)
fmt.Println(err)
return
}
func (l *LoginServer) OnStart(_ event.OnStart) (err error) {
return
}
func (l *LoginServer) OnCycle(_ event.Tick) (err error) {
return
}
type LoginServerSetting func(*LoginServer)
func WithOtherAccount(a *api.Account) LoginServerSetting {
return func(s *LoginServer) {
if s.Given == nil {
return
}
s.Given = &NameAndUUID{
Name: a.Name,
UUID: a.Uuid,
}
}
}
func WithRawStatus(status []byte) LoginServerSetting {
return func(s *LoginServer) {
s.Status = status
}
}
func WithStatus(response StatusResponse) LoginServerSetting {
var status []byte
status, err := json.Marshal(response)
if err != nil {
panic(err)
}
slog.Debug("With status", "status", status)
return WithRawStatus(status)
}
func WithCompatibleVersion(versions int32) LoginServerSetting {
return WithCompatibleVersions([]int32{versions})
}
func WithCompatibleVersionsRange(start, end int32) LoginServerSetting {
var versions []int32
for i := start; i <= end; i++ {
versions = append(versions, i)
}
return WithCompatibleVersions(versions)
}
func WithCompatibleVersions(versions []int32) LoginServerSetting {
return func(s *LoginServer) {
s.CompatibleVersions = versions
}
}
func ServeLogin(c *proto.Conn, settings ...LoginServerSetting) (ret *LoginServer, err error) {
ret = &LoginServer{Conn: c}
for _, s := range settings {
s(ret)
}
ret.CompressionThreshold = 256
err = ret.Start(ret)
return
}
server/server_modules/status.go
-58
View File
@@ -1,58 +0,0 @@
package server_modules
import (
"encoding/json"
"github.com/admin-else/strom/proto"
"github.com/admin-else/strom/proto_generated/v1_21_8"
"github.com/admin-else/strom/text"
)
// StatusResponse here is the structure I used: https://minecraft.wiki/w/Java_Edition_protocol/Server_List_Ping#Status_Response
type StatusResponse struct {
Version struct {
Name *text.Component `json:"name"`
Protocol int `json:"protocol"`
} `json:"version"`
Players struct {
Max int `json:"max"`
Online int `json:"online"`
Sample []struct {
Name *text.Component `json:"name"`
ID string `json:"id"`
} `json:"sample"`
} `json:"players"`
Description *text.Component `json:"description"`
Favicon string `json:"favicon"`
EnforcesSecureChat bool `json:"enforcesSecureChat"`
}
type StatusServer struct {
*proto.Conn
Status string
}
func (p *StatusServer) Default(_ any) (err error) {
return
}
func (p *StatusServer) OnStatusRequest(_ *v1_21_8.StatusToServerPacketPingStart) (err error) {
return p.Send(&v1_21_8.StatusToClientPacketServerInfo{Response: p.Status})
}
func (p *StatusServer) OnStatusPing(packet *v1_21_8.StatusToServerPacketPing) (err error) {
return p.Send(&v1_21_8.StatusToClientPacketPing{Time: packet.Time})
}
func ServeStatus(c *proto.Conn, s StatusResponse) (err error) {
status, err := json.Marshal(s)
if err != nil {
return
}
server := &StatusServer{
Conn: c,
Status: string(status),
}
err = server.Start(server)
return
}
text/text.go
+49
View File
@@ -62,11 +62,56 @@ func (c *Component) MarshalJSON() ([]byte, error) {
if c.isSimpleText() {
return json.Marshal(c.Text)
}
if c.hasFormattingButNoContent() {
// just like component but text does not have omitempty
type AliasWithText struct {
Bold *bool `json:"bold,omitempty"`
Italic *bool `json:"italic,omitempty"`
Underlined *bool `json:"underlined,omitempty"`
Strikethrough *bool `json:"strikethrough,omitempty"`
Obfuscated *bool `json:"obfuscated,omitempty"`
Font string `json:"font,omitempty"`
Color string `json:"color,omitempty"`
Insertion string `json:"insertion,omitempty"`
ClickEvent *ClickEvent `json:"clickEvent,omitempty"`
HoverEvent *HoverEvent `json:"hoverEvent,omitempty"`
Extra []Component `json:"extra,omitempty"`
Text string `json:"text"`
Translate string `json:"translate,omitempty"`
With []Component `json:"with,omitempty"`
Score *Score `json:"score,omitempty"`
Selector string `json:"selector,omitempty"`
Keybind string `json:"keybind,omitempty"`
NBT string `json:"nbt,omitempty"`
Interpret bool `json:"interpret,omitempty"`
Block string `json:"block,omitempty"`
Entity string `json:"entity,omitempty"`
Storage string `json:"storage,omitempty"`
Separator *Component `json:"separator,omitempty"`
}
return json.Marshal(AliasWithText(*c))
}
type Alias Component
return json.Marshal(Alias(*c))
}
// hasFormattingButNoContent checks if the component has formatting/styling but no content fields
func (c *Component) hasFormattingButNoContent() bool {
hasFormatting := c.Bold != nil || c.Italic != nil || c.Underlined != nil ||
c.Strikethrough != nil || c.Obfuscated != nil || c.Font != "" ||
c.Color != "" || c.Insertion != "" || c.ClickEvent != nil ||
c.HoverEvent != nil || len(c.Extra) > 0 || c.Separator != nil
hasContent := c.Text != "" || c.Translate != "" || len(c.With) > 0 ||
c.Score != nil || c.Selector != "" || c.Keybind != "" ||
c.NBT != "" || c.Block != "" || c.Entity != "" || c.Storage != ""
return hasFormatting && !hasContent
}
func (c *Component) isSimpleText() bool {
return c.Text != "" &&
c.Bold == nil && c.Italic == nil && c.Underlined == nil && c.Strikethrough == nil && c.Obfuscated == nil &&
@@ -215,6 +260,10 @@ func (c *Component) ToNBT() any {
m["separator"] = c.Separator.ToNBT()
}
if c.hasFormattingButNoContent() {
m["text"] = ""
}
return m
}
tools/uncodeable_packet_hunter_proxy/main.go
+7 -16
View File
@@ -4,6 +4,7 @@ package main
import (
"crypto/sha256"
"fmt"
"log/slog"
"os"
"github.com/admin-else/strom/api"
@@ -13,7 +14,6 @@ import (
"github.com/admin-else/strom/proto_base"
"github.com/admin-else/strom/proto_generated/v1_21_8"
"github.com/admin-else/strom/server"
"github.com/admin-else/strom/server/server_modules"
"github.com/admin-else/strom/text"
)
@@ -116,6 +116,7 @@ func SaveUnCodeAbleAsTest(d proto_base.Direction, packet proto.UnCodablePacket)
if err != nil {
panic(err)
}
//goland:noinspection GoUnhandledErrorResult
defer f.Close()
_, err = fmt.Fprintf(f, TestSrcF, packet.Err, h, d.Opposite(), packet.Data)
if err != nil {
@@ -124,32 +125,23 @@ func SaveUnCodeAbleAsTest(d proto_base.Direction, packet proto.UnCodablePacket)
fmt.Println("Error", packet.Err, "saved to", f.Name(), "data:", packet.Data)
}
var StatusResponse = server_modules.StatusResponse{
Version: struct {
Name *text.Component `json:"name"`
Protocol int `json:"protocol"`
}{
var StatusResponse = server.StatusResponse{
Version: server.StatusResponseVersion{
Name: text.Pretty("STROM"),
Protocol: 772,
},
Players: struct {
Max int `json:"max"`
Online int `json:"online"`
Sample []struct {
Name *text.Component `json:"name"`
ID string `json:"id"`
} `json:"sample"`
}{},
Players: server.StatusResponsePlayers{},
Description: text.Pretty("Hunt the uncodeable packets"),
Favicon: "",
EnforcesSecureChat: false,
}
func main() {
slog.SetLogLoggerLevel(slog.LevelDebug)
err := server.StartServerWithOnConn(":25565", func(serveeConn *proto.Conn) (err error) {
p := &Proxy{Conn: serveeConn, Client: nil}
acc := api.NewOfflineAccount("sigma")
_, err = server_modules.ServeLogin(serveeConn, server_modules.WithOtherAccount(acc), server_modules.WithStatus(StatusResponse))
_, err = server.ServeLogin(serveeConn, server.WithOtherAccount(acc), server.WithStatus(StatusResponse))
if err != nil {
return
}
@@ -161,7 +153,6 @@ func main() {
p.Client = pc
errChan := make(chan error)
defer pc.Close()
defer p.Close()
go func() {
errChan <- pc.Start(pc)
}()