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mysql_handler.go
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mysql_handler.go
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package mysqlfe
import (
"fmt"
"strings"
u "github.com/araddon/gou"
"github.com/kr/pretty"
"github.com/araddon/qlbridge/exec"
"github.com/araddon/qlbridge/expr"
"github.com/araddon/qlbridge/lex"
"github.com/araddon/qlbridge/plan"
"github.com/araddon/qlbridge/rel"
"github.com/araddon/qlbridge/schema"
"github.com/araddon/qlbridge/value"
"github.com/dataux/dataux/models"
"github.com/dataux/dataux/vendored/mixer/mysql"
mysqlproxy "github.com/dataux/dataux/vendored/mixer/proxy"
)
func init() {
// Load our Frontend Listener's
models.ListenerRegister(mysqlproxy.ListenerType, &MySqlConnCreator{})
}
const (
// Default Max Allowed packets for connections
MaxAllowedPacket = 4194304
//MaxAllowedPacketStr = "4194304"
)
var (
_ = value.ErrValue
_ = u.EMPTY
_ = pretty.Diff
// Ensure we meet our interfaces
_ models.Listener = (*MySqlConnCreator)(nil)
_ models.StatementHandler = (*mySqlHandler)(nil)
)
// MySql connection handler, a single connection session
// not threadsafe, not shared
type MySqlConnCreator struct {
svr *models.ServerCtx
conf *models.ListenerConfig
l models.Listener
}
func (m *MySqlConnCreator) Init(conf *models.ListenerConfig, svr *models.ServerCtx) error {
//u.Debugf("mysql conn creator")
l, err := mysqlproxy.ListenerInit(conf, svr.Config, m)
if err != nil {
u.Errorf("could not get mysql listener: %v", err)
return err
}
m.l = l
m.svr = svr
m.conf = conf
return nil
}
// Open handler is a per-client/conn copy of handler
// - this occurs once when a new tcp-conn is established
// - it re-uses the HandlerShard with has schema, etc on it
func (m *MySqlConnCreator) Open(connI interface{}) models.StatementHandler {
handler := mySqlHandler{svr: m.svr}
if conn, ok := connI.(*mysqlproxy.Conn); ok {
//u.Debugf("Cloning Mysql handler %v", conn)
handler.conn = conn
handler.connId = conn.ConnId()
handler.sess = NewMySqlSessionVars("default", conn.User(), conn.ConnId())
return &handler
}
panic(fmt.Sprintf("not proxy.Conn? %T", connI))
}
func (m *MySqlConnCreator) Run(stop chan bool) error {
return m.l.Run(stop)
}
func (m *MySqlConnCreator) Close() error {
// TODO Better close management
return nil
}
// MySql connection creator
// - per connection, ie session specific
type mySqlHandler struct {
svr *models.ServerCtx
sess expr.ContextReadWriter // session info
conn *mysqlproxy.Conn // Connection to client, inbound mysql conn
schema *schema.Schema
connId uint32
}
func (m *mySqlHandler) Close() error {
if m.conn != nil {
err := m.conn.Close()
m.conn = nil
return err
}
return nil
}
// Implement the Handle interface for frontends
func (m *mySqlHandler) Handle(writer models.ResultWriter, req *models.Request) error {
return m.chooseCommand(writer, req)
}
// Session level schema Use command of sql
func (m *mySqlHandler) SchemaUse(db string) *schema.Schema {
schema, ok := m.svr.Schema(db)
if schema == nil || !ok {
u.Warnf("Could not find schema for db=%s", db)
return nil
}
m.schema = schema
m.sess = NewMySqlSessionVars(db, m.conn.User(), m.connId)
return schema
}
func (m *mySqlHandler) chooseCommand(writer models.ResultWriter, req *models.Request) error {
// First byte of mysql is a "command" type
cmd := req.Raw[0]
req.Raw = req.Raw[1:] // the rest is the statement which will get parsed
//u.Debugf("chooseCommand: %v:%v", cmd, mysql.CommandString(cmd))
switch cmd {
case mysql.COM_FIELD_LIST:
// mysql is going to deprecate it, so we don't support it
msg := fmt.Sprintf("command %d:%s is deprecated", cmd, mysql.CommandString(cmd))
return mysql.NewError(mysql.ER_WARN_DEPRECATED_SYNTAX, msg)
case mysql.COM_QUERY, mysql.COM_STMT_PREPARE:
return m.handleQuery(writer, string(req.Raw))
case mysql.COM_PING:
return m.writeOK(nil)
case mysql.COM_QUIT:
//u.Warnf("who is asking me to Quit? %s", string(cmd))
m.Close()
return nil
case mysql.COM_INIT_DB:
if s := m.SchemaUse(string(req.Raw)); s == nil {
return fmt.Errorf("Schema not found %s", string(req.Raw))
} else {
return m.writeOK(nil)
}
// case mysql.COM_STMT_EXECUTE:
// case mysql.COM_STMT_CLOSE:
// case mysql.COM_STMT_SEND_LONG_DATA:
// case mysql.COM_STMT_RESET:
default:
msg := fmt.Sprintf("command %d:%s not yet supported", cmd, mysql.CommandString(cmd))
return mysql.NewError(mysql.ER_UNKNOWN_ERROR, msg)
}
return nil
}
func (m *mySqlHandler) handleQuery(writer models.ResultWriter, sql string) (err error) {
u.Debugf("%d %p handleQuery: %v", m.connId, m, sql)
if !m.svr.Config.SupressRecover {
//u.Debugf("running recovery? ")
defer func() {
if e := recover(); e != nil {
u.Errorf("recover? %v", e)
err = fmt.Errorf("handle query %s error %v", sql, e)
return
}
}()
}
if m.schema == nil {
s, err := m.svr.InfoSchema()
if err != nil {
return err
}
//u.Warnf("no schema so use info schema? %#v", s)
m.schema = s.InfoSchema
}
// Ensure it parses, right now we can't handle multiple statement (ie with semi-colons separating)
// sql = strings.TrimRight(sql, ";")
ctx := plan.NewContext(sql)
ctx.DisableRecover = m.svr.Config.SupressRecover
ctx.Session = m.sess
ctx.Schema = m.schema
ctx.Funcs = fr
if ctx.Schema == nil {
u.Warnf("no schema: ")
} else {
//u.Debugf("ctx has schema? %#v", ctx.Schema)
}
job, err := BuildMySqlJob(m.svr, ctx)
if err != nil {
u.Debugf("error? nilstmt?%v err=%v", ctx.Stmt == nil, err)
if ctx.Stmt != nil {
switch ctx.Stmt.Keyword() {
case lex.TokenRollback, lex.TokenCommit:
// we don't currently support transactions
return m.conn.WriteOK(nil)
case lex.TokenSet:
// set autocommit
// SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ
return m.conn.WriteOK(nil)
}
} else {
sql = strings.ToLower(sql)
switch {
case strings.HasPrefix(sql, "rollback") || strings.HasPrefix(sql, "commit"):
case strings.HasPrefix(sql, "set "):
}
}
u.Debugf("error on parse sql statement: %v", err)
return err
}
if job == nil {
// we are done, already wrote results
return nil
}
//u.Infof("job.Ctx %p Session %p", job.Ctx, job.Ctx.Session)
//job.Ctx.Session = m.sess
var resultWriter exec.Task
switch stmt := job.Ctx.Stmt.(type) {
case *rel.SqlSelect:
resultWriter = NewMySqlResultWriter(writer, job.Ctx)
case *rel.SqlShow, *rel.SqlDescribe:
resultWriter = NewMySqlSchemaWriter(writer, job.Ctx)
case *rel.SqlInsert, *rel.SqlUpsert, *rel.SqlUpdate, *rel.SqlDelete:
resultWriter = NewMySqlExecResultWriter(writer, job.Ctx)
case *rel.SqlCommand:
if stmt.Keyword() == lex.TokenRollback {
return m.conn.WriteOK(nil)
}
err = job.Run()
job.Close()
if err != nil {
return err
}
return m.conn.WriteOK(nil)
default:
u.Warnf("sql not supported? %v %T", stmt, stmt)
return fmt.Errorf("statement type %T not supported", stmt)
}
// job.Finalize() will:
// - insert any network/distributed tasks to other worker nodes
// - wait for those nodes to be ready to run
// - append the result writer after those tasks
err = job.Finalize(resultWriter)
if err != nil {
u.Errorf("error on finalize %v", err)
return err
}
//u.Infof("mysqlhandler %p task.Run() start", job.RootTask)
err = job.Run()
//u.Infof("mysqlhandler %p task.Run() complete", job.RootTask)
if err != nil {
u.Errorf("error on Query.Run(): %v", err)
}
//u.Infof("mysqlhandler %p task.Close() start for %T", job.RootTask, job.RootTask)
closeErr := job.Close()
if closeErr != nil {
u.Errorf("could not close ? %v", closeErr)
}
//u.Infof("mysqlhandler %p task.Close() complete err=%v", job.RootTask, err)
return err
}
func (m *mySqlHandler) writeOK(r *mysql.Result) error {
return m.conn.WriteOK(r)
}
func makeBindVars(args []interface{}) map[string]interface{} {
bindVars := make(map[string]interface{}, len(args))
for i, v := range args {
bindVars[fmt.Sprintf("v%d", i+1)] = v
}
return bindVars
}