refactor(channelserver): split handlers.go into sub-files

Extract from the 1638-line catch-all handlers.go into focused files:
- handlers_helpers.go: shared doAck* helpers and updateRights
- handlers_session.go: login/logout, save, system protocol handlers
- handlers_items.go: items, prices, stamps, stampcard
- handlers.go: remaining misc handlers (goocoo, earth, seibattle, etc.)

server/channelserver/handlers_helpers.go

@@ -0,0 +1,76 @@
+package channelserver
+
+import (
+	"erupe-ce/common/byteframe"
+	"erupe-ce/common/mhfcourse"
+	"erupe-ce/network/mhfpacket"
+)
+
+// Temporary function to just return no results for a MSG_MHF_ENUMERATE* packet
+func stubEnumerateNoResults(s *Session, ackHandle uint32) {
+	enumBf := byteframe.NewByteFrame()
+	enumBf.WriteUint32(0) // Entry count (count for quests, rankings, events, etc.)
+
+	doAckBufSucceed(s, ackHandle, enumBf.Data())
+}
+
+func doAckEarthSucceed(s *Session, ackHandle uint32, data []*byteframe.ByteFrame) {
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint32(uint32(s.server.erupeConfig.EarthID))
+	bf.WriteUint32(0)
+	bf.WriteUint32(0)
+	bf.WriteUint32(uint32(len(data)))
+	for i := range data {
+		bf.WriteBytes(data[i].Data())
+	}
+	doAckBufSucceed(s, ackHandle, bf.Data())
+}
+
+func doAckBufSucceed(s *Session, ackHandle uint32, data []byte) {
+	s.QueueSendMHF(&mhfpacket.MsgSysAck{
+		AckHandle:        ackHandle,
+		IsBufferResponse: true,
+		ErrorCode:        0,
+		AckData:          data,
+	})
+}
+
+func doAckBufFail(s *Session, ackHandle uint32, data []byte) {
+	s.QueueSendMHF(&mhfpacket.MsgSysAck{
+		AckHandle:        ackHandle,
+		IsBufferResponse: true,
+		ErrorCode:        1,
+		AckData:          data,
+	})
+}
+
+func doAckSimpleSucceed(s *Session, ackHandle uint32, data []byte) {
+	s.QueueSendMHF(&mhfpacket.MsgSysAck{
+		AckHandle:        ackHandle,
+		IsBufferResponse: false,
+		ErrorCode:        0,
+		AckData:          data,
+	})
+}
+
+func doAckSimpleFail(s *Session, ackHandle uint32, data []byte) {
+	s.QueueSendMHF(&mhfpacket.MsgSysAck{
+		AckHandle:        ackHandle,
+		IsBufferResponse: false,
+		ErrorCode:        1,
+		AckData:          data,
+	})
+}
+
+func updateRights(s *Session) {
+	rightsInt := uint32(2)
+	_ = s.server.db.QueryRow("SELECT rights FROM users u INNER JOIN characters c ON u.id = c.user_id WHERE c.id = $1", s.charID).Scan(&rightsInt)
+	s.courses, rightsInt = mhfcourse.GetCourseStruct(rightsInt)
+	update := &mhfpacket.MsgSysUpdateRight{
+		ClientRespAckHandle: 0,
+		Bitfield:            rightsInt,
+		Rights:              s.courses,
+		UnkSize:             0,
+	}
+	s.QueueSendMHFNonBlocking(update)
+}