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thrsafe.go
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thrsafe.go
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// Thread safe engine for MyMySQL
//
// In contrast to native engine:
// - one connection can be used by multiple gorutines,
// - if connection is idle pings are sent to the server (once per minute) to
// avoid timeout.
//
// See documentation of mymysql/native for details
package thrsafe
import (
"github.com/ziutek/mymysql/mysql"
_ "github.com/ziutek/mymysql/native"
"io"
"sync"
"time"
)
type Conn struct {
mysql.Conn
mutex *sync.Mutex
stopPinger chan struct{}
lastUsed time.Time
}
func (c *Conn) lock() {
//log.Println(c, ":: lock @", c.mutex)
c.mutex.Lock()
}
func (c *Conn) unlock() {
//log.Println(c, ":: unlock @", c.mutex)
c.lastUsed = time.Now()
c.mutex.Unlock()
}
type Result struct {
mysql.Result
conn *Conn
}
type Stmt struct {
mysql.Stmt
conn *Conn
}
type Transaction struct {
*Conn
conn *Conn
}
func New(proto, laddr, raddr, user, passwd string, db ...string) mysql.Conn {
return &Conn{
Conn: orgNew(proto, laddr, raddr, user, passwd, db...),
mutex: new(sync.Mutex),
}
}
func (c *Conn) Clone() mysql.Conn {
return &Conn{
Conn: c.Conn.Clone(),
mutex: new(sync.Mutex),
}
}
func (c *Conn) pinger() {
const to = 60 * time.Second
sleep := to
for {
timer := time.After(sleep)
select {
case <-c.stopPinger:
return
case t := <-timer:
sleep := to - t.Sub(c.lastUsed)
if sleep <= 0 {
if c.Ping() != nil {
return
}
sleep = to
}
}
}
}
func (c *Conn) Connect() error {
//log.Println("Connect")
c.lock()
defer c.unlock()
c.stopPinger = make(chan struct{})
go c.pinger()
return c.Conn.Connect()
}
func (c *Conn) Close() error {
//log.Println("Close")
close(c.stopPinger) // Stop pinger before lock connection
c.lock()
defer c.unlock()
return c.Conn.Close()
}
func (c *Conn) Reconnect() error {
//log.Println("Reconnect")
c.lock()
defer c.unlock()
if c.stopPinger == nil {
go c.pinger()
}
return c.Conn.Reconnect()
}
func (c *Conn) Use(dbname string) error {
//log.Println("Use")
c.lock()
defer c.unlock()
return c.Conn.Use(dbname)
}
func (c *Conn) Start(sql string, params ...interface{}) (mysql.Result, error) {
//log.Println("Start")
c.lock()
res, err := c.Conn.Start(sql, params...)
// Unlock if error or OK result (which doesn't provide any fields)
if err != nil {
c.unlock()
return nil, err
}
if res.StatusOnly() && !res.MoreResults() {
c.unlock()
}
return &Result{Result: res, conn: c}, err
}
func (res *Result) ScanRow(row mysql.Row) error {
//log.Println("ScanRow")
err := res.Result.ScanRow(row)
if err == nil {
// There are more rows to read
return nil
}
if err == mysql.ErrReadAfterEOR {
// Trying read after EOR - connection unlocked before
return err
}
if err != io.EOF || !res.StatusOnly() && !res.MoreResults() {
// Error or no more rows in not empty result set and no more resutls.
// In case if empty result set and no more resutls Start has unlocked
// it before.
res.conn.unlock()
}
return err
}
func (res *Result) GetRow() (mysql.Row, error) {
return mysql.GetRow(res)
}
func (res *Result) NextResult() (mysql.Result, error) {
//log.Println("NextResult")
next, err := res.Result.NextResult()
if err != nil {
return nil, err
}
if next == nil {
return nil, nil
}
if next.StatusOnly() && !next.MoreResults() {
res.conn.unlock()
}
return &Result{next, res.conn}, nil
}
func (c *Conn) Ping() error {
c.lock()
defer c.unlock()
return c.Conn.Ping()
}
func (c *Conn) Prepare(sql string) (mysql.Stmt, error) {
//log.Println("Prepare")
c.lock()
defer c.unlock()
stmt, err := c.Conn.Prepare(sql)
if err != nil {
return nil, err
}
return &Stmt{Stmt: stmt, conn: c}, nil
}
func (stmt *Stmt) Run(params ...interface{}) (mysql.Result, error) {
//log.Println("Run")
stmt.conn.lock()
res, err := stmt.Stmt.Run(params...)
// Unlock if error or OK result (which doesn't provide any fields)
if err != nil {
stmt.conn.unlock()
return nil, err
}
if res.StatusOnly() && !res.MoreResults() {
stmt.conn.unlock()
}
return &Result{Result: res, conn: stmt.conn}, nil
}
func (stmt *Stmt) Delete() error {
//log.Println("Delete")
stmt.conn.lock()
defer stmt.conn.unlock()
return stmt.Stmt.Delete()
}
func (stmt *Stmt) Reset() error {
//log.Println("Reset")
stmt.conn.lock()
defer stmt.conn.unlock()
return stmt.Stmt.Reset()
}
func (stmt *Stmt) SendLongData(pnum int, data interface{}, pkt_size int) error {
//log.Println("SendLongData")
stmt.conn.lock()
defer stmt.conn.unlock()
return stmt.Stmt.SendLongData(pnum, data, pkt_size)
}
// See mysql.Query
func (c *Conn) Query(sql string, params ...interface{}) ([]mysql.Row, mysql.Result, error) {
return mysql.Query(c, sql, params...)
}
// See mysql.QueryFirst
func (my *Conn) QueryFirst(sql string, params ...interface{}) (mysql.Row, mysql.Result, error) {
return mysql.QueryFirst(my, sql, params...)
}
// See mysql.QueryLast
func (my *Conn) QueryLast(sql string, params ...interface{}) (mysql.Row, mysql.Result, error) {
return mysql.QueryLast(my, sql, params...)
}
// See mysql.Exec
func (stmt *Stmt) Exec(params ...interface{}) ([]mysql.Row, mysql.Result, error) {
return mysql.Exec(stmt, params...)
}
// See mysql.ExecFirst
func (stmt *Stmt) ExecFirst(params ...interface{}) (mysql.Row, mysql.Result, error) {
return mysql.ExecFirst(stmt, params...)
}
// See mysql.ExecLast
func (stmt *Stmt) ExecLast(params ...interface{}) (mysql.Row, mysql.Result, error) {
return mysql.ExecLast(stmt, params...)
}
// See mysql.End
func (res *Result) End() error {
return mysql.End(res)
}
// See mysql.GetFirstRow
func (res *Result) GetFirstRow() (mysql.Row, error) {
return mysql.GetFirstRow(res)
}
// See mysql.GetLastRow
func (res *Result) GetLastRow() (mysql.Row, error) {
return mysql.GetLastRow(res)
}
// See mysql.GetRows
func (res *Result) GetRows() ([]mysql.Row, error) {
return mysql.GetRows(res)
}
// Begins a new transaction. No any other thread can send command on this
// connection until Commit or Rollback will be called.
// Periodical pinging the server is disabled during transaction.
func (c *Conn) Begin() (mysql.Transaction, error) {
//log.Println("Begin")
c.lock()
tr := Transaction{
&Conn{Conn: c.Conn, mutex: new(sync.Mutex)},
c,
}
_, err := c.Conn.Start("START TRANSACTION")
if err != nil {
c.unlock()
return nil, err
}
return &tr, nil
}
func (tr *Transaction) end(cr string) error {
tr.lock()
_, err := tr.conn.Conn.Start(cr)
tr.conn.unlock()
// Invalidate this transaction
m := tr.Conn.mutex
tr.Conn = nil
tr.conn = nil
m.Unlock() // One goorutine which still uses this transaction will panic
return err
}
func (tr *Transaction) Commit() error {
//log.Println("Commit")
return tr.end("COMMIT")
}
func (tr *Transaction) Rollback() error {
//log.Println("Rollback")
return tr.end("ROLLBACK")
}
func (tr *Transaction) IsValid() bool {
return tr.Conn != nil
}
func (tr *Transaction) Do(st mysql.Stmt) mysql.Stmt {
if s, ok := st.(*Stmt); ok && s.conn == tr.conn {
// Returns new statement which uses statement mutexes
return &Stmt{s.Stmt, tr.Conn}
}
panic("Transaction and statement doesn't belong to the same connection")
}
var orgNew func(proto, laddr, raddr, user, passwd string, db ...string) mysql.Conn
func init() {
orgNew = mysql.New
mysql.New = New
}