func (cc *clientConn) dispatch(data []byte) error {
cmd := data[0]
data = data[1:]
cc.lastCmd = hack.String(data)
token := cc.server.getToken()
defer func() {
cc.server.releaseToken(token)
}()
switch cmd {
case mysql.ComQuit:
return io.EOF
case mysql.ComQuery:
return cc.handleQuery(hack.String(data))
case mysql.ComPing:
return cc.writeOK()
case mysql.ComInitDB:
log.Debug("init db", hack.String(data))
if err := cc.useDB(hack.String(data)); err != nil {
return errors.Trace(err)
}
return cc.writeOK()
case mysql.ComFieldList:
return cc.handleFieldList(hack.String(data))
case mysql.ComStmtPrepare:
return cc.handleStmtPrepare(hack.String(data))
case mysql.ComStmtExecute:
return cc.handleStmtExecute(data)
case mysql.ComStmtClose:
return cc.handleStmtClose(data)
case mysql.ComStmtSendLongData:
return cc.handleStmtSendLongData(data)
case mysql.ComStmtReset:
return cc.handleStmtReset(data)
default:
msg := fmt.Sprintf("command %d not supported now", cmd)
return mysql.NewError(mysql.ErUnknownError, msg)
}
}
func (cc *clientConn) writeError(e error) error {
var m *mysql.SQLError
var ok bool
if m, ok = e.(*mysql.SQLError); !ok {
m = mysql.NewError(mysql.ErUnknownError, e.Error())
}
data := make([]byte, 4, 16+len(m.Message))
data = append(data, mysql.ErrHeader)
data = append(data, byte(m.Code), byte(m.Code>>8))
if cc.capability&mysql.ClientProtocol41 > 0 {
data = append(data, '#')
data = append(data, m.State...)
}
data = append(data, m.Message...)
err := cc.writePacket(data)
if err != nil {
return errors.Trace(err)
}
return errors.Trace(cc.flush())
}
func (cc *clientConn) handleStmtExecute(data []byte) (err error) {
if len(data) < 9 {
return mysql.ErrMalformPacket
}
pos := 0
stmtID := binary.LittleEndian.Uint32(data[0:4])
pos += 4
stmt := cc.ctx.GetStatement(int(stmtID))
if stmt == nil {
return mysql.NewDefaultError(mysql.ErUnknownStmtHandler,
strconv.FormatUint(uint64(stmtID), 10), "stmt_execute")
}
flag := data[pos]
pos++
//now we only support CURSOR_TYPE_NO_CURSOR flag
if flag != 0 {
return mysql.NewError(mysql.ErUnknownError, fmt.Sprintf("unsupported flag %d", flag))
}
//skip iteration-count, always 1
pos += 4
var (
nullBitmaps []byte
paramTypes []byte
paramValues []byte
)
numParams := stmt.NumParams()
args := make([]interface{}, numParams)
if numParams > 0 {
nullBitmapLen := (numParams + 7) >> 3
if len(data) < (pos + nullBitmapLen + 1) {
return mysql.ErrMalformPacket
}
nullBitmaps = data[pos : pos+nullBitmapLen]
pos += nullBitmapLen
//new param bound flag
if data[pos] == 1 {
pos++
if len(data) < (pos + (numParams << 1)) {
return mysql.ErrMalformPacket
}
paramTypes = data[pos : pos+(numParams<<1)]
pos += (numParams << 1)
paramValues = data[pos:]
}
err = parseStmtArgs(args, stmt.BoundParams(), nullBitmaps, paramTypes, paramValues)
if err != nil {
return errors.Trace(err)
}
}
rs, err := stmt.Execute(args...)
if err != nil {
return errors.Trace(err)
}
if rs == nil {
return errors.Trace(cc.writeOK())
}
return errors.Trace(cc.writeResultset(rs, true))
}
