Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/pingcap/tidb/sessionctx/variable/session.go

@@ -0,0 +1,144 @@
+// Copyright 2015 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package variable
+
+import (
+	"github.com/pingcap/tidb/context"
+)
+
+// SessionVars is to handle user-defined or global variables in current session.
+type SessionVars struct {
+	// user-defined variables
+	Users map[string]string
+	// system variables
+	Systems map[string]string
+	// prepared statement
+	PreparedStmts map[uint32]interface{}
+
+	PreparedStmtNameToID map[string]uint32
+	// prepared statement auto increment id
+	preparedStmtID uint32
+
+	// following variables are special for current session
+	Status       uint16
+	LastInsertID uint64
+	AffectedRows uint64
+
+	// Client capability
+	ClientCapability uint32
+
+	// Connection ID
+	ConnectionID uint64
+
+	// Found rows
+	FoundRows uint64
+
+	// Current user
+	User string
+}
+
+// sessionVarsKeyType is a dummy type to avoid naming collision in context.
+type sessionVarsKeyType int
+
+// String defines a Stringer function for debugging and pretty printing.
+func (k sessionVarsKeyType) String() string {
+	return "session_vars"
+}
+
+const sessionVarsKey sessionVarsKeyType = 0
+
+// BindSessionVars creates a session vars object and binds it to context.
+func BindSessionVars(ctx context.Context) {
+	v := &SessionVars{
+		Users:                make(map[string]string),
+		Systems:              make(map[string]string),
+		PreparedStmts:        make(map[uint32]interface{}),
+		PreparedStmtNameToID: make(map[string]uint32),
+	}
+
+	ctx.SetValue(sessionVarsKey, v)
+}
+
+// GetSessionVars gets the session vars from context.
+func GetSessionVars(ctx context.Context) *SessionVars {
+	v, ok := ctx.Value(sessionVarsKey).(*SessionVars)
+	if !ok {
+		return nil
+	}
+	return v
+}
+
+const (
+	characterSetConnection = "character_set_connection"
+	collationConnection    = "collation_connection"
+)
+
+// GetCharsetInfo gets charset and collation for current context.
+// What character set should the server translate a statement to after receiving it?
+// For this, the server uses the character_set_connection and collation_connection system variables.
+// It converts statements sent by the client from character_set_client to character_set_connection
+// (except for string literals that have an introducer such as _latin1 or _utf8).
+// collation_connection is important for comparisons of literal strings.
+// For comparisons of strings with column values, collation_connection does not matter because columns
+// have their own collation, which has a higher collation precedence.
+// See: https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html
+func GetCharsetInfo(ctx context.Context) (charset, collation string) {
+	sessionVars := GetSessionVars(ctx)
+	charset = sessionVars.Systems[characterSetConnection]
+	collation = sessionVars.Systems[collationConnection]
+	return
+}
+
+// SetLastInsertID saves the last insert id to the session context.
+// TODO: we may store the result for last_insert_id sys var later.
+func (s *SessionVars) SetLastInsertID(insertID uint64) {
+	s.LastInsertID = insertID
+}
+
+// SetAffectedRows saves the affected rows to the session context.
+func (s *SessionVars) SetAffectedRows(affectedRows uint64) {
+	s.AffectedRows = affectedRows
+}
+
+// AddAffectedRows adds affected rows with the argument rows.
+func (s *SessionVars) AddAffectedRows(rows uint64) {
+	s.AffectedRows += rows
+}
+
+// AddFoundRows adds found rows with the argument rows.
+func (s *SessionVars) AddFoundRows(rows uint64) {
+	s.FoundRows += rows
+}
+
+// SetStatusFlag sets the session server status variable.
+// If on is ture sets the flag in session status,
+// otherwise removes the flag.
+func (s *SessionVars) SetStatusFlag(flag uint16, on bool) {
+	if on {
+		s.Status |= flag
+		return
+	}
+	s.Status &= (^flag)
+}
+
+// GetNextPreparedStmtID generates and returns the next session scope prepared statement id.
+func (s *SessionVars) GetNextPreparedStmtID() uint32 {
+	s.preparedStmtID++
+	return s.preparedStmtID
+}
+
+// SetCurrentUser saves the current user to the session context.
+func (s *SessionVars) SetCurrentUser(user string) {
+	s.User = user
+}