From b2c83498a968108469af260880cc778b1d706d57 Mon Sep 17 00:00:00 2001
From: andy <zhiangli029@gmail.com>
Date: Thu, 22 Aug 2019 11:16:48 +0800
Subject: [PATCH] *: add autocommit-false-is-txn to set autocommit=0 start txn
 #298

---
 src/config/config.go  |  2 ++
 src/proxy/proxy.go    |  8 ++++++++
 src/proxy/set.go      |  3 ++-
 src/proxy/set_test.go | 33 ++++++++++++++++++++++++++++++++-
 src/proxy/spanner.go  |  4 ++++
 5 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/src/config/config.go b/src/config/config.go
index 2d1f1581..b38cddf6 100644
--- a/src/config/config.go
+++ b/src/config/config.go
@@ -38,6 +38,8 @@ type ProxyConfig struct {
 	LongQueryTime    int    `json:"long-query-time"`
 	StreamBufferSize int    `json:"stream-buffer-size"`
 	IdleTxnTimeout   uint32 `json:"kill-idle-transaction"` //is consistent with the official 8.0 kill_idle_transaction
+
+	AutocommitFalseIsTxn bool `json:"autocommit-false-is-txn"`
 }
 
 // DefaultProxyConfig returns default proxy config.
diff --git a/src/proxy/proxy.go b/src/proxy/proxy.go
index d16d658a..232315d0 100644
--- a/src/proxy/proxy.go
+++ b/src/proxy/proxy.go
@@ -229,6 +229,14 @@ func (p *Proxy) SetTwoPC(enable bool) {
 	p.conf.Proxy.TwopcEnable = enable
 }
 
+// SetAutocommitFalseIsTxn used to set autocommitFalseIsTxn to true or false.
+func (p *Proxy) SetAutocommitFalseIsTxn(enable bool) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.log.Info("proxy.SetAutocommitFalseIsTxn:[%v->%v]", p.conf.Proxy.AutocommitFalseIsTxn, enable)
+	p.conf.Proxy.AutocommitFalseIsTxn = enable
+}
+
 // SetAllowIP used to set allow ips.
 func (p *Proxy) SetAllowIP(ips []string) {
 	p.mu.Lock()
diff --git a/src/proxy/set.go b/src/proxy/set.go
index 679b348f..c414e532 100644
--- a/src/proxy/set.go
+++ b/src/proxy/set.go
@@ -56,6 +56,7 @@ func (spanner *Spanner) handleSet(session *driver.Session, query string, node *s
 					txSession.setStreamingFetchVar(false)
 				}
 			}
+
 		case var_mysql_autocommit:
 			var autocommit = true
 
@@ -68,7 +69,7 @@ func (spanner *Spanner) handleSet(session *driver.Session, query string, node *s
 					}
 				}
 			}
-			if !autocommit {
+			if !autocommit && spanner.isAutocommitFalseIsTxn() {
 				query := "begin"
 				node := &sqlparser.Transaction{
 					Action: "begin",
diff --git a/src/proxy/set_test.go b/src/proxy/set_test.go
index de36384c..9c8c44b6 100644
--- a/src/proxy/set_test.go
+++ b/src/proxy/set_test.go
@@ -79,7 +79,7 @@ func TestProxySet(t *testing.T) {
 }
 
 func TestProxySetAutocommit(t *testing.T) {
-	log := xlog.NewStdLog(xlog.Level(xlog.DEBUG))
+	log := xlog.NewStdLog(xlog.Level(xlog.PANIC))
 	fakedbs, proxy, cleanup := MockProxy(log)
 	defer cleanup()
 	address := proxy.Address()
@@ -87,6 +87,7 @@ func TestProxySetAutocommit(t *testing.T) {
 	// fakedbs.
 	{
 		proxy.conf.Proxy.TwopcEnable = true
+		proxy.conf.Proxy.AutocommitFalseIsTxn = true
 		fakedbs.AddQueryPattern("create .*", &sqltypes.Result{})
 		fakedbs.AddQueryPattern("select .*", &sqltypes.Result{})
 		fakedbs.AddQueryPattern("xa .*", &sqltypes.Result{})
@@ -119,4 +120,34 @@ func TestProxySetAutocommit(t *testing.T) {
 			assert.NotNil(t, err)
 		}
 	}
+
+	proxy.conf.Proxy.AutocommitFalseIsTxn = false
+	{
+		client, err := driver.NewConn("mock", "mock", address, "", "utf8")
+		assert.Nil(t, err)
+		{
+			query := "set autocommit=0"
+			_, err := client.FetchAll(query, -1)
+			assert.Nil(t, err)
+
+			query = "select 1"
+			_, err = client.FetchAll(query, -1)
+			assert.Nil(t, err)
+
+			query = "commit"
+			_, err = client.FetchAll(query, -1)
+			assert.NotNil(t, err)
+		}
+		{
+			query := "set autocommit=1"
+			_, err := client.FetchAll(query, -1)
+			assert.Nil(t, err)
+
+			query = "commit"
+			_, err = client.FetchAll(query, -1)
+			assert.NotNil(t, err)
+		}
+	}
+
+
 }
diff --git a/src/proxy/spanner.go b/src/proxy/spanner.go
index cec59d26..b545b795 100644
--- a/src/proxy/spanner.go
+++ b/src/proxy/spanner.go
@@ -124,3 +124,7 @@ func (spanner *Spanner) ServerVersion() string {
 func (spanner *Spanner) isTwoPC() bool {
 	return spanner.conf.Proxy.TwopcEnable
 }
+
+func (spanner *Spanner) isAutocommitFalseIsTxn() bool {
+	return spanner.conf.Proxy.AutocommitFalseIsTxn
+}