database/sql: add SetMaxOpenConns
Update #4805
Add the ability to set an open connection limit.
Fixed case where the Conn finalCloser was being called with db.mu locked.
Added separate benchmarks for each path for Exec and Query.
Replaced slice based idle pool with list based idle pool.
R=bradfitz
CC=golang-dev
https://golang.org/cl/10726044
diff --git a/src/pkg/database/sql/fakedb_test.go b/src/pkg/database/sql/fakedb_test.go
index 8af753b..39c0282 100644
--- a/src/pkg/database/sql/fakedb_test.go
+++ b/src/pkg/database/sql/fakedb_test.go
@@ -447,6 +447,10 @@
return c.prepareCreate(stmt, parts)
case "INSERT":
return c.prepareInsert(stmt, parts)
+ case "NOSERT":
+ // Do all the prep-work like for an INSERT but don't actually insert the row.
+ // Used for some of the concurrent tests.
+ return c.prepareInsert(stmt, parts)
default:
stmt.Close()
return nil, errf("unsupported command type %q", cmd)
@@ -497,13 +501,20 @@
}
return driver.ResultNoRows, nil
case "INSERT":
- return s.execInsert(args)
+ return s.execInsert(args, true)
+ case "NOSERT":
+ // Do all the prep-work like for an INSERT but don't actually insert the row.
+ // Used for some of the concurrent tests.
+ return s.execInsert(args, false)
}
fmt.Printf("EXEC statement, cmd=%q: %#v\n", s.cmd, s)
return nil, fmt.Errorf("unimplemented statement Exec command type of %q", s.cmd)
}
-func (s *fakeStmt) execInsert(args []driver.Value) (driver.Result, error) {
+// When doInsert is true, add the row to the table.
+// When doInsert is false do prep-work and error checking, but don't
+// actually add the row to the table.
+func (s *fakeStmt) execInsert(args []driver.Value, doInsert bool) (driver.Result, error) {
db := s.c.db
if len(args) != s.placeholders {
panic("error in pkg db; should only get here if size is correct")
@@ -518,7 +529,10 @@
t.mu.Lock()
defer t.mu.Unlock()
- cols := make([]interface{}, len(t.colname))
+ var cols []interface{}
+ if doInsert {
+ cols = make([]interface{}, len(t.colname))
+ }
argPos := 0
for n, colname := range s.colName {
colidx := t.columnIndex(colname)
@@ -532,10 +546,14 @@
} else {
val = s.colValue[n]
}
- cols[colidx] = val
+ if doInsert {
+ cols[colidx] = val
+ }
}
- t.rows = append(t.rows, &row{cols: cols})
+ if doInsert {
+ t.rows = append(t.rows, &row{cols: cols})
+ }
return driver.RowsAffected(1), nil
}
diff --git a/src/pkg/database/sql/sql.go b/src/pkg/database/sql/sql.go
index d81f6fe..ae313ca 100644
--- a/src/pkg/database/sql/sql.go
+++ b/src/pkg/database/sql/sql.go
@@ -10,6 +10,7 @@
package sql
import (
+ "container/list"
"database/sql/driver"
"errors"
"fmt"
@@ -192,12 +193,22 @@
driver driver.Driver
dsn string
- mu sync.Mutex // protects following fields
- freeConn []*driverConn
+ mu sync.Mutex // protects following fields
+ freeConn *list.List // of *driverConn
+ connRequests *list.List // of connRequest
+ numOpen int
+ pendingOpens int
+ // Used to sygnal the need for new connections
+ // a goroutine running connectionOpener() reads on this chan and
+ // maybeOpenNewConnections sends on the chan (one send per needed connection)
+ // It is closed during db.Close(). The close tells the connectionOpener
+ // goroutine to exit.
+ openerCh chan struct{}
closed bool
dep map[finalCloser]depSet
lastPut map[*driverConn]string // stacktrace of last conn's put; debug only
maxIdle int // zero means defaultMaxIdleConns; negative means 0
+ maxOpen int // <= 0 means unlimited
}
// driverConn wraps a driver.Conn with a mutex, to
@@ -217,6 +228,9 @@
inUse bool
onPut []func() // code (with db.mu held) run when conn is next returned
dbmuClosed bool // same as closed, but guarded by db.mu, for connIfFree
+ // This is the Element returned by db.freeConn.PushFront(conn).
+ // It's used by connIfFree to remove the conn from the freeConn list.
+ listElem *list.Element
}
func (dc *driverConn) releaseConn(err error) {
@@ -254,15 +268,14 @@
}
// the dc.db's Mutex is held.
-func (dc *driverConn) closeDBLocked() error {
+func (dc *driverConn) closeDBLocked() func() error {
dc.Lock()
+ defer dc.Unlock()
if dc.closed {
- dc.Unlock()
- return errors.New("sql: duplicate driverConn close")
+ return func() error { return errors.New("sql: duplicate driverConn close") }
}
dc.closed = true
- dc.Unlock() // not defer; removeDep finalClose calls may need to lock
- return dc.db.removeDepLocked(dc, dc)()
+ return dc.db.removeDepLocked(dc, dc)
}
func (dc *driverConn) Close() error {
@@ -293,8 +306,13 @@
err := dc.ci.Close()
dc.ci = nil
dc.finalClosed = true
-
dc.Unlock()
+
+ dc.db.mu.Lock()
+ dc.db.numOpen--
+ dc.db.maybeOpenNewConnections()
+ dc.db.mu.Unlock()
+
return err
}
@@ -380,6 +398,13 @@
}
}
+// This is the size of the connectionOpener request chan (dn.openerCh).
+// This value should be larger than the maximum typical value
+// used for db.maxOpen. If maxOpen is significantly larger than
+// connectionRequestQueueSize then it is possible for ALL calls into the *DB
+// to block until the connectionOpener can satify the backlog of requests.
+var connectionRequestQueueSize = 1000000
+
// Open opens a database specified by its database driver name and a
// driver-specific data source name, usually consisting of at least a
// database name and connection information.
@@ -398,10 +423,14 @@
return nil, fmt.Errorf("sql: unknown driver %q (forgotten import?)", driverName)
}
db := &DB{
- driver: driveri,
- dsn: dataSourceName,
- lastPut: make(map[*driverConn]string),
+ driver: driveri,
+ dsn: dataSourceName,
+ openerCh: make(chan struct{}, connectionRequestQueueSize),
+ lastPut: make(map[*driverConn]string),
}
+ db.freeConn = list.New()
+ db.connRequests = list.New()
+ go db.connectionOpener()
return db, nil
}
@@ -422,16 +451,32 @@
// Close closes the database, releasing any open resources.
func (db *DB) Close() error {
db.mu.Lock()
- defer db.mu.Unlock()
+ if db.closed { // Make DB.Close idempotent
+ db.mu.Unlock()
+ return nil
+ }
+ close(db.openerCh)
var err error
- for _, dc := range db.freeConn {
- err1 := dc.closeDBLocked()
+ fns := make([]func() error, 0, db.freeConn.Len())
+ for db.freeConn.Front() != nil {
+ dc := db.freeConn.Front().Value.(*driverConn)
+ dc.listElem = nil
+ fns = append(fns, dc.closeDBLocked())
+ db.freeConn.Remove(db.freeConn.Front())
+ }
+ db.closed = true
+ for db.connRequests.Front() != nil {
+ req := db.connRequests.Front().Value.(connRequest)
+ db.connRequests.Remove(db.connRequests.Front())
+ close(req)
+ }
+ db.mu.Unlock()
+ for _, fn := range fns {
+ err1 := fn()
if err1 != nil {
err = err1
}
}
- db.freeConn = nil
- db.closed = true
return err
}
@@ -453,6 +498,9 @@
// SetMaxIdleConns sets the maximum number of connections in the idle
// connection pool.
//
+// If MaxOpenConns is greater than 0 but less than the new MaxIdleConns
+// then the new MaxIdleConns will be reduced to match the MaxOpenConns limit
+//
// If n <= 0, no idle connections are retained.
func (db *DB) SetMaxIdleConns(n int) {
db.mu.Lock()
@@ -463,40 +511,148 @@
// No idle connections.
db.maxIdle = -1
}
- for len(db.freeConn) > 0 && len(db.freeConn) > n {
- nfree := len(db.freeConn)
- dc := db.freeConn[nfree-1]
- db.freeConn[nfree-1] = nil
- db.freeConn = db.freeConn[:nfree-1]
+ // Make sure maxIdle doesn't exceed maxOpen
+ if db.maxOpen > 0 && db.maxIdleConnsLocked() > db.maxOpen {
+ db.maxIdle = db.maxOpen
+ }
+ for db.freeConn.Len() > db.maxIdleConnsLocked() {
+ dc := db.freeConn.Back().Value.(*driverConn)
+ dc.listElem = nil
+ db.freeConn.Remove(db.freeConn.Back())
go dc.Close()
}
}
+// SetMaxOpenConns sets the maximum number of open connections to the database.
+//
+// If MaxIdleConns is greater than 0 and the new MaxOpenConns is less than
+// MaxIdleConns, then MaxIdleConns will be reduced to match the new
+// MaxOpenConns limit
+//
+// If n <= 0, then there is no limit on the number of open connections.
+// The default is 0 (unlimited).
+func (db *DB) SetMaxOpenConns(n int) {
+ db.mu.Lock()
+ db.maxOpen = n
+ if n < 0 {
+ db.maxOpen = 0
+ }
+ syncMaxIdle := db.maxOpen > 0 && db.maxIdleConnsLocked() > db.maxOpen
+ db.mu.Unlock()
+ if syncMaxIdle {
+ db.SetMaxIdleConns(n)
+ }
+}
+
+// Assumes db.mu is locked.
+// If there are connRequests and the connection limit hasn't been reached,
+// then tell the connectionOpener to open new connections.
+func (db *DB) maybeOpenNewConnections() {
+ numRequests := db.connRequests.Len() - db.pendingOpens
+ if db.maxOpen > 0 {
+ numCanOpen := db.maxOpen - (db.numOpen + db.pendingOpens)
+ if numRequests > numCanOpen {
+ numRequests = numCanOpen
+ }
+ }
+ for numRequests > 0 {
+ db.pendingOpens++
+ numRequests--
+ db.openerCh <- struct{}{}
+ }
+}
+
+// Runs in a seperate goroutine, opens new connections when requested.
+func (db *DB) connectionOpener() {
+ for _ = range db.openerCh {
+ db.openNewConnection()
+ }
+}
+
+// Open one new connection
+func (db *DB) openNewConnection() {
+ ci, err := db.driver.Open(db.dsn)
+ db.mu.Lock()
+ defer db.mu.Unlock()
+ if db.closed {
+ if err == nil {
+ ci.Close()
+ }
+ return
+ }
+ db.pendingOpens--
+ if err != nil {
+ db.putConnDBLocked(nil, err)
+ return
+ }
+ dc := &driverConn{
+ db: db,
+ ci: ci,
+ }
+ db.addDepLocked(dc, dc)
+ db.numOpen++
+ db.putConnDBLocked(dc, err)
+}
+
+// connRequest represents one request for a new connection
+// When there are no idle connections available, DB.conn will create
+// a new connRequest and put it on the db.connRequests list.
+type connRequest chan<- interface{} // takes either a *driverConn or an error
+
+var errDBClosed = errors.New("sql: database is closed")
+
// conn returns a newly-opened or cached *driverConn
func (db *DB) conn() (*driverConn, error) {
db.mu.Lock()
if db.closed {
db.mu.Unlock()
- return nil, errors.New("sql: database is closed")
+ return nil, errDBClosed
}
- if n := len(db.freeConn); n > 0 {
- conn := db.freeConn[n-1]
- db.freeConn = db.freeConn[:n-1]
+
+ // If db.maxOpen > 0 and the number of open connections is over the limit
+ // or there are no free connection, then make a request and wait.
+ if db.maxOpen > 0 && (db.numOpen >= db.maxOpen || db.freeConn.Len() == 0) {
+ // Make the connRequest channel. It's buffered so that the
+ // connectionOpener doesn't block while waiting for the req to be read.
+ ch := make(chan interface{}, 1)
+ req := connRequest(ch)
+ db.connRequests.PushBack(req)
+ db.maybeOpenNewConnections()
+ db.mu.Unlock()
+ ret, ok := <-ch
+ if !ok {
+ return nil, errDBClosed
+ }
+ switch ret.(type) {
+ case *driverConn:
+ return ret.(*driverConn), nil
+ case error:
+ return nil, ret.(error)
+ default:
+ panic("sql: Unexpected type passed through connRequest.ch")
+ }
+ }
+
+ if f := db.freeConn.Front(); f != nil {
+ conn := f.Value.(*driverConn)
+ conn.listElem = nil
+ db.freeConn.Remove(f)
conn.inUse = true
db.mu.Unlock()
return conn, nil
}
- db.mu.Unlock()
+ db.mu.Unlock()
ci, err := db.driver.Open(db.dsn)
if err != nil {
return nil, err
}
+ db.mu.Lock()
+ db.numOpen++
dc := &driverConn{
db: db,
ci: ci,
}
- db.mu.Lock()
db.addDepLocked(dc, dc)
dc.inUse = true
db.mu.Unlock()
@@ -524,12 +680,9 @@
if wanted.inUse {
return nil, errConnBusy
}
- for i, conn := range db.freeConn {
- if conn != wanted {
- continue
- }
- db.freeConn[i] = db.freeConn[len(db.freeConn)-1]
- db.freeConn = db.freeConn[:len(db.freeConn)-1]
+ if wanted.listElem != nil {
+ db.freeConn.Remove(wanted.listElem)
+ wanted.listElem = nil
wanted.inUse = true
return wanted, nil
}
@@ -589,6 +742,10 @@
if err == driver.ErrBadConn {
// Don't reuse bad connections.
+ // Since the conn is considered bad and is being discarded, treat it
+ // as closed. Decrement the open count.
+ db.numOpen--
+ db.maybeOpenNewConnections()
db.mu.Unlock()
dc.Close()
return
@@ -596,14 +753,39 @@
if putConnHook != nil {
putConnHook(db, dc)
}
- if n := len(db.freeConn); !db.closed && n < db.maxIdleConnsLocked() {
- db.freeConn = append(db.freeConn, dc)
- db.mu.Unlock()
- return
- }
+ added := db.putConnDBLocked(dc, nil)
db.mu.Unlock()
- dc.Close()
+ if !added {
+ dc.Close()
+ }
+}
+
+// Satisfy a connRequest or put the driverConn in the idle pool and return true
+// or return false.
+// putConnDBLocked will satisfy a connRequest if there is one, or it will
+// return the *driverConn to the freeConn list if err != nil and the idle
+// connection limit would not be reached.
+// If err != nil, the value of dc is ignored.
+// If err == nil, then dc must not equal nil.
+// If a connRequest was fullfilled or the *driverConn was placed in the
+// freeConn list, then true is returned, otherwise false is returned.
+func (db *DB) putConnDBLocked(dc *driverConn, err error) bool {
+ if db.connRequests.Len() > 0 {
+ req := db.connRequests.Front().Value.(connRequest)
+ db.connRequests.Remove(db.connRequests.Front())
+ if err != nil {
+ req <- err
+ } else {
+ dc.inUse = true
+ req <- dc
+ }
+ return true
+ } else if err == nil && !db.closed && db.maxIdleConnsLocked() > 0 && db.maxIdleConnsLocked() > db.freeConn.Len() {
+ dc.listElem = db.freeConn.PushFront(dc)
+ return true
+ }
+ return false
}
// Prepare creates a prepared statement for later queries or executions.
@@ -1250,26 +1432,32 @@
return s.stickyErr
}
s.mu.Lock()
- defer s.mu.Unlock()
if s.closed {
+ s.mu.Unlock()
return nil
}
s.closed = true
if s.tx != nil {
s.txsi.Close()
+ s.mu.Unlock()
return nil
}
+ s.mu.Unlock()
return s.db.removeDep(s, s)
}
func (s *Stmt) finalClose() error {
- for _, v := range s.css {
- s.db.noteUnusedDriverStatement(v.dc, v.si)
- v.dc.removeOpenStmt(v.si)
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.css != nil {
+ for _, v := range s.css {
+ s.db.noteUnusedDriverStatement(v.dc, v.si)
+ v.dc.removeOpenStmt(v.si)
+ }
+ s.css = nil
}
- s.css = nil
return nil
}
diff --git a/src/pkg/database/sql/sql_test.go b/src/pkg/database/sql/sql_test.go
index 4005f15..435d79c 100644
--- a/src/pkg/database/sql/sql_test.go
+++ b/src/pkg/database/sql/sql_test.go
@@ -8,6 +8,7 @@
"database/sql/driver"
"errors"
"fmt"
+ "math/rand"
"reflect"
"runtime"
"strings"
@@ -23,14 +24,12 @@
}
freedFrom := make(map[dbConn]string)
putConnHook = func(db *DB, c *driverConn) {
- for _, oc := range db.freeConn {
- if oc == c {
- // print before panic, as panic may get lost due to conflicting panic
- // (all goroutines asleep) elsewhere, since we might not unlock
- // the mutex in freeConn here.
- println("double free of conn. conflicts are:\nA) " + freedFrom[dbConn{db, c}] + "\n\nand\nB) " + stack())
- panic("double free of conn.")
- }
+ if c.listElem != nil {
+ // print before panic, as panic may get lost due to conflicting panic
+ // (all goroutines asleep) elsewhere, since we might not unlock
+ // the mutex in freeConn here.
+ println("double free of conn. conflicts are:\nA) " + freedFrom[dbConn{db, c}] + "\n\nand\nB) " + stack())
+ panic("double free of conn.")
}
freedFrom[dbConn{db, c}] = stack()
}
@@ -80,14 +79,15 @@
t.Errorf("Error closing fakeConn: %v", err)
}
})
- for i, dc := range db.freeConn {
+ for node, i := db.freeConn.Front(), 0; node != nil; node, i = node.Next(), i+1 {
+ dc := node.Value.(*driverConn)
if n := len(dc.openStmt); n > 0 {
// Just a sanity check. This is legal in
// general, but if we make the tests clean up
// their statements first, then we can safely
// verify this is always zero here, and any
// other value is a leak.
- t.Errorf("while closing db, freeConn %d/%d had %d open stmts; want 0", i, len(db.freeConn), n)
+ t.Errorf("while closing db, freeConn %d/%d had %d open stmts; want 0", i, db.freeConn.Len(), n)
}
}
err := db.Close()
@@ -99,10 +99,10 @@
// numPrepares assumes that db has exactly 1 idle conn and returns
// its count of calls to Prepare
func numPrepares(t *testing.T, db *DB) int {
- if n := len(db.freeConn); n != 1 {
+ if n := db.freeConn.Len(); n != 1 {
t.Fatalf("free conns = %d; want 1", n)
}
- return db.freeConn[0].ci.(*fakeConn).numPrepare
+ return (db.freeConn.Front().Value.(*driverConn)).ci.(*fakeConn).numPrepare
}
func (db *DB) numDeps() int {
@@ -127,7 +127,7 @@
func (db *DB) numFreeConns() int {
db.mu.Lock()
defer db.mu.Unlock()
- return len(db.freeConn)
+ return db.freeConn.Len()
}
func (db *DB) dumpDeps(t *testing.T) {
@@ -642,10 +642,10 @@
if err != nil {
t.Fatal(err)
}
- if len(db.freeConn) != 1 {
+ if db.freeConn.Len() != 1 {
t.Fatalf("expected 1 free conn")
}
- fakeConn := db.freeConn[0].ci.(*fakeConn)
+ fakeConn := (db.freeConn.Front().Value.(*driverConn)).ci.(*fakeConn)
if made, closed := fakeConn.stmtsMade, fakeConn.stmtsClosed; made != closed {
t.Errorf("statement close mismatch: made %d, closed %d", made, closed)
}
@@ -841,13 +841,13 @@
t.Fatal(err)
}
tx.Commit()
- if got := len(db.freeConn); got != 1 {
+ if got := db.freeConn.Len(); got != 1 {
t.Errorf("freeConns = %d; want 1", got)
}
db.SetMaxIdleConns(0)
- if got := len(db.freeConn); got != 0 {
+ if got := db.freeConn.Len(); got != 0 {
t.Errorf("freeConns after set to zero = %d; want 0", got)
}
@@ -856,11 +856,146 @@
t.Fatal(err)
}
tx.Commit()
- if got := len(db.freeConn); got != 0 {
+ if got := db.freeConn.Len(); got != 0 {
t.Errorf("freeConns = %d; want 0", got)
}
}
+func TestMaxOpenConns(t *testing.T) {
+ if testing.Short() {
+ t.Skip("skipping in short mode")
+ }
+ defer setHookpostCloseConn(nil)
+ setHookpostCloseConn(func(_ *fakeConn, err error) {
+ if err != nil {
+ t.Errorf("Error closing fakeConn: %v", err)
+ }
+ })
+
+ db := newTestDB(t, "magicquery")
+ defer closeDB(t, db)
+
+ driver := db.driver.(*fakeDriver)
+
+ // Force the number of open connections to 0 so we can get an accurate
+ // count for the test
+ db.SetMaxIdleConns(0)
+
+ if g, w := db.numFreeConns(), 0; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(0, time.Second); n > 0 {
+ t.Errorf("number of dependencies = %d; expected 0", n)
+ db.dumpDeps(t)
+ }
+
+ driver.mu.Lock()
+ opens0 := driver.openCount
+ closes0 := driver.closeCount
+ driver.mu.Unlock()
+
+ db.SetMaxIdleConns(10)
+ db.SetMaxOpenConns(10)
+
+ stmt, err := db.Prepare("SELECT|magicquery|op|op=?,millis=?")
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // Start 50 parallel slow queries.
+ const (
+ nquery = 50
+ sleepMillis = 25
+ nbatch = 2
+ )
+ var wg sync.WaitGroup
+ for batch := 0; batch < nbatch; batch++ {
+ for i := 0; i < nquery; i++ {
+ wg.Add(1)
+ go func() {
+ defer wg.Done()
+ var op string
+ if err := stmt.QueryRow("sleep", sleepMillis).Scan(&op); err != nil && err != ErrNoRows {
+ t.Error(err)
+ }
+ }()
+ }
+ // Sleep for twice the expected length of time for the
+ // batch of 50 queries above to finish before starting
+ // the next round.
+ time.Sleep(2 * sleepMillis * time.Millisecond)
+ }
+ wg.Wait()
+
+ if g, w := db.numFreeConns(), 10; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(20, time.Second); n > 20 {
+ t.Errorf("number of dependencies = %d; expected <= 20", n)
+ db.dumpDeps(t)
+ }
+
+ driver.mu.Lock()
+ opens := driver.openCount - opens0
+ closes := driver.closeCount - closes0
+ driver.mu.Unlock()
+
+ if opens > 10 {
+ t.Logf("open calls = %d", opens)
+ t.Logf("close calls = %d", closes)
+ t.Errorf("db connections opened = %d; want <= 10", opens)
+ db.dumpDeps(t)
+ }
+
+ if err := stmt.Close(); err != nil {
+ t.Fatal(err)
+ }
+
+ if g, w := db.numFreeConns(), 10; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(10, time.Second); n > 10 {
+ t.Errorf("number of dependencies = %d; expected <= 10", n)
+ db.dumpDeps(t)
+ }
+
+ db.SetMaxOpenConns(5)
+
+ if g, w := db.numFreeConns(), 5; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(5, time.Second); n > 5 {
+ t.Errorf("number of dependencies = %d; expected 0", n)
+ db.dumpDeps(t)
+ }
+
+ db.SetMaxOpenConns(0)
+
+ if g, w := db.numFreeConns(), 5; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(5, time.Second); n > 5 {
+ t.Errorf("number of dependencies = %d; expected 0", n)
+ db.dumpDeps(t)
+ }
+
+ db.SetMaxIdleConns(0)
+
+ if g, w := db.numFreeConns(), 0; g != w {
+ t.Errorf("free conns = %d; want %d", g, w)
+ }
+
+ if n := db.numDepsPollUntil(0, time.Second); n > 0 {
+ t.Errorf("number of dependencies = %d; expected 0", n)
+ db.dumpDeps(t)
+ }
+}
+
// golang.org/issue/5323
func TestStmtCloseDeps(t *testing.T) {
if testing.Short() {
@@ -926,8 +1061,8 @@
driver.mu.Lock()
opens := driver.openCount - opens0
closes := driver.closeCount - closes0
- driver.mu.Unlock()
openDelta := (driver.openCount - driver.closeCount) - openDelta0
+ driver.mu.Unlock()
if openDelta > 2 {
t.Logf("open calls = %d", opens)
@@ -985,10 +1120,10 @@
t.Fatal(err)
}
- if len(db.freeConn) != 1 {
- t.Fatalf("expected 1 freeConn; got %d", len(db.freeConn))
+ if db.freeConn.Len() != 1 {
+ t.Fatalf("expected 1 freeConn; got %d", db.freeConn.Len())
}
- dc := db.freeConn[0]
+ dc := db.freeConn.Front().Value.(*driverConn)
if dc.closed {
t.Errorf("conn shouldn't be closed")
}
@@ -1082,6 +1217,350 @@
}
}
+type concurrentTest interface {
+ init(t testing.TB, db *DB)
+ finish(t testing.TB)
+ test(t testing.TB) error
+}
+
+type concurrentDBQueryTest struct {
+ db *DB
+}
+
+func (c *concurrentDBQueryTest) init(t testing.TB, db *DB) {
+ c.db = db
+}
+
+func (c *concurrentDBQueryTest) finish(t testing.TB) {
+ c.db = nil
+}
+
+func (c *concurrentDBQueryTest) test(t testing.TB) error {
+ rows, err := c.db.Query("SELECT|people|name|")
+ if err != nil {
+ t.Error(err)
+ return err
+ }
+ var name string
+ for rows.Next() {
+ rows.Scan(&name)
+ }
+ rows.Close()
+ return nil
+}
+
+type concurrentDBExecTest struct {
+ db *DB
+}
+
+func (c *concurrentDBExecTest) init(t testing.TB, db *DB) {
+ c.db = db
+}
+
+func (c *concurrentDBExecTest) finish(t testing.TB) {
+ c.db = nil
+}
+
+func (c *concurrentDBExecTest) test(t testing.TB) error {
+ _, err := c.db.Exec("NOSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?", 3, chrisBirthday)
+ if err != nil {
+ t.Error(err)
+ return err
+ }
+ return nil
+}
+
+type concurrentStmtQueryTest struct {
+ db *DB
+ stmt *Stmt
+}
+
+func (c *concurrentStmtQueryTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.stmt, err = db.Prepare("SELECT|people|name|")
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentStmtQueryTest) finish(t testing.TB) {
+ if c.stmt != nil {
+ c.stmt.Close()
+ c.stmt = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentStmtQueryTest) test(t testing.TB) error {
+ rows, err := c.stmt.Query()
+ if err != nil {
+ t.Errorf("error on query: %v", err)
+ return err
+ }
+
+ var name string
+ for rows.Next() {
+ rows.Scan(&name)
+ }
+ rows.Close()
+ return nil
+}
+
+type concurrentStmtExecTest struct {
+ db *DB
+ stmt *Stmt
+}
+
+func (c *concurrentStmtExecTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.stmt, err = db.Prepare("NOSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?")
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentStmtExecTest) finish(t testing.TB) {
+ if c.stmt != nil {
+ c.stmt.Close()
+ c.stmt = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentStmtExecTest) test(t testing.TB) error {
+ _, err := c.stmt.Exec(3, chrisBirthday)
+ if err != nil {
+ t.Errorf("error on exec: %v", err)
+ return err
+ }
+ return nil
+}
+
+type concurrentTxQueryTest struct {
+ db *DB
+ tx *Tx
+}
+
+func (c *concurrentTxQueryTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.tx, err = c.db.Begin()
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentTxQueryTest) finish(t testing.TB) {
+ if c.tx != nil {
+ c.tx.Rollback()
+ c.tx = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentTxQueryTest) test(t testing.TB) error {
+ rows, err := c.db.Query("SELECT|people|name|")
+ if err != nil {
+ t.Error(err)
+ return err
+ }
+ var name string
+ for rows.Next() {
+ rows.Scan(&name)
+ }
+ rows.Close()
+ return nil
+}
+
+type concurrentTxExecTest struct {
+ db *DB
+ tx *Tx
+}
+
+func (c *concurrentTxExecTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.tx, err = c.db.Begin()
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentTxExecTest) finish(t testing.TB) {
+ if c.tx != nil {
+ c.tx.Rollback()
+ c.tx = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentTxExecTest) test(t testing.TB) error {
+ _, err := c.tx.Exec("NOSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?", 3, chrisBirthday)
+ if err != nil {
+ t.Error(err)
+ return err
+ }
+ return nil
+}
+
+type concurrentTxStmtQueryTest struct {
+ db *DB
+ tx *Tx
+ stmt *Stmt
+}
+
+func (c *concurrentTxStmtQueryTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.tx, err = c.db.Begin()
+ if err != nil {
+ t.Fatal(err)
+ }
+ c.stmt, err = c.tx.Prepare("SELECT|people|name|")
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentTxStmtQueryTest) finish(t testing.TB) {
+ if c.stmt != nil {
+ c.stmt.Close()
+ c.stmt = nil
+ }
+ if c.tx != nil {
+ c.tx.Rollback()
+ c.tx = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentTxStmtQueryTest) test(t testing.TB) error {
+ rows, err := c.stmt.Query()
+ if err != nil {
+ t.Errorf("error on query: %v", err)
+ return err
+ }
+
+ var name string
+ for rows.Next() {
+ rows.Scan(&name)
+ }
+ rows.Close()
+ return nil
+}
+
+type concurrentTxStmtExecTest struct {
+ db *DB
+ tx *Tx
+ stmt *Stmt
+}
+
+func (c *concurrentTxStmtExecTest) init(t testing.TB, db *DB) {
+ c.db = db
+ var err error
+ c.tx, err = c.db.Begin()
+ if err != nil {
+ t.Fatal(err)
+ }
+ c.stmt, err = c.tx.Prepare("NOSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?")
+ if err != nil {
+ t.Fatal(err)
+ }
+}
+
+func (c *concurrentTxStmtExecTest) finish(t testing.TB) {
+ if c.stmt != nil {
+ c.stmt.Close()
+ c.stmt = nil
+ }
+ if c.tx != nil {
+ c.tx.Rollback()
+ c.tx = nil
+ }
+ c.db = nil
+}
+
+func (c *concurrentTxStmtExecTest) test(t testing.TB) error {
+ _, err := c.stmt.Exec(3, chrisBirthday)
+ if err != nil {
+ t.Errorf("error on exec: %v", err)
+ return err
+ }
+ return nil
+}
+
+type concurrentRandomTest struct {
+ tests []concurrentTest
+}
+
+func (c *concurrentRandomTest) init(t testing.TB, db *DB) {
+ c.tests = []concurrentTest{
+ new(concurrentDBQueryTest),
+ new(concurrentDBExecTest),
+ new(concurrentStmtQueryTest),
+ new(concurrentStmtExecTest),
+ new(concurrentTxQueryTest),
+ new(concurrentTxExecTest),
+ new(concurrentTxStmtQueryTest),
+ new(concurrentTxStmtExecTest),
+ }
+ for _, ct := range c.tests {
+ ct.init(t, db)
+ }
+}
+
+func (c *concurrentRandomTest) finish(t testing.TB) {
+ for _, ct := range c.tests {
+ ct.finish(t)
+ }
+}
+
+func (c *concurrentRandomTest) test(t testing.TB) error {
+ ct := c.tests[rand.Intn(len(c.tests))]
+ return ct.test(t)
+}
+
+func doConcurrentTest(t testing.TB, ct concurrentTest) {
+ maxProcs, numReqs := 1, 500
+ if testing.Short() {
+ maxProcs, numReqs = 4, 50
+ }
+ defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(maxProcs))
+
+ db := newTestDB(t, "people")
+ defer closeDB(t, db)
+
+ ct.init(t, db)
+ defer ct.finish(t)
+
+ var wg sync.WaitGroup
+ wg.Add(numReqs)
+
+ reqs := make(chan bool)
+ defer close(reqs)
+
+ for i := 0; i < maxProcs*2; i++ {
+ go func() {
+ for _ = range reqs {
+ err := ct.test(t)
+ if err != nil {
+ wg.Done()
+ continue
+ }
+ wg.Done()
+ }
+ }()
+ }
+
+ for i := 0; i < numReqs; i++ {
+ reqs <- true
+ }
+
+ wg.Wait()
+}
+
func manyConcurrentQueries(t testing.TB) {
maxProcs, numReqs := 16, 500
if testing.Short() {
@@ -1178,12 +1657,77 @@
}
func TestConcurrency(t *testing.T) {
- manyConcurrentQueries(t)
+ doConcurrentTest(t, new(concurrentDBQueryTest))
+ doConcurrentTest(t, new(concurrentDBExecTest))
+ doConcurrentTest(t, new(concurrentStmtQueryTest))
+ doConcurrentTest(t, new(concurrentStmtExecTest))
+ doConcurrentTest(t, new(concurrentTxQueryTest))
+ doConcurrentTest(t, new(concurrentTxExecTest))
+ doConcurrentTest(t, new(concurrentTxStmtQueryTest))
+ doConcurrentTest(t, new(concurrentTxStmtExecTest))
+ doConcurrentTest(t, new(concurrentRandomTest))
}
-func BenchmarkConcurrency(b *testing.B) {
+func BenchmarkConcurrentDBExec(b *testing.B) {
b.ReportAllocs()
+ ct := new(concurrentDBExecTest)
for i := 0; i < b.N; i++ {
- manyConcurrentQueries(b)
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentStmtQuery(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentStmtQueryTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentStmtExec(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentStmtExecTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentTxQuery(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentTxQueryTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentTxExec(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentTxExecTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentTxStmtQuery(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentTxStmtQueryTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentTxStmtExec(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentTxStmtExecTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
+ }
+}
+
+func BenchmarkConcurrentRandom(b *testing.B) {
+ b.ReportAllocs()
+ ct := new(concurrentRandomTest)
+ for i := 0; i < b.N; i++ {
+ doConcurrentTest(b, ct)
}
}
