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Source file src/github.com/gomodule/redigo/redis/pool_test.go

Documentation: github.com/gomodule/redigo/redis

     1  // Copyright 2011 Gary Burd
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package redis_test
    16  
    17  import (
    18  	"errors"
    19  	"io"
    20  	"reflect"
    21  	"sync"
    22  	"testing"
    23  	"time"
    24  
    25  	"github.com/gomodule/redigo/redis"
    26  )
    27  
    28  type poolTestConn struct {
    29  	d   *poolDialer
    30  	err error
    31  	redis.Conn
    32  }
    33  
    34  func (c *poolTestConn) Close() error {
    35  	c.d.mu.Lock()
    36  	c.d.open -= 1
    37  	c.d.mu.Unlock()
    38  	return c.Conn.Close()
    39  }
    40  
    41  func (c *poolTestConn) Err() error { return c.err }
    42  
    43  func (c *poolTestConn) Do(commandName string, args ...interface{}) (interface{}, error) {
    44  	if commandName == "ERR" {
    45  		c.err = args[0].(error)
    46  		commandName = "PING"
    47  	}
    48  	if commandName != "" {
    49  		c.d.commands = append(c.d.commands, commandName)
    50  	}
    51  	return c.Conn.Do(commandName, args...)
    52  }
    53  
    54  func (c *poolTestConn) Send(commandName string, args ...interface{}) error {
    55  	c.d.commands = append(c.d.commands, commandName)
    56  	return c.Conn.Send(commandName, args...)
    57  }
    58  
    59  type poolDialer struct {
    60  	mu       sync.Mutex
    61  	t        *testing.T
    62  	dialed   int
    63  	open     int
    64  	commands []string
    65  	dialErr  error
    66  }
    67  
    68  func (d *poolDialer) dial() (redis.Conn, error) {
    69  	d.mu.Lock()
    70  	d.dialed += 1
    71  	dialErr := d.dialErr
    72  	d.mu.Unlock()
    73  	if dialErr != nil {
    74  		return nil, d.dialErr
    75  	}
    76  	c, err := redis.DialDefaultServer()
    77  	if err != nil {
    78  		return nil, err
    79  	}
    80  	d.mu.Lock()
    81  	d.open += 1
    82  	d.mu.Unlock()
    83  	return &poolTestConn{d: d, Conn: c}, nil
    84  }
    85  
    86  func (d *poolDialer) check(message string, p *redis.Pool, dialed, open, inuse int) {
    87  	d.mu.Lock()
    88  	if d.dialed != dialed {
    89  		d.t.Errorf("%s: dialed=%d, want %d", message, d.dialed, dialed)
    90  	}
    91  	if d.open != open {
    92  		d.t.Errorf("%s: open=%d, want %d", message, d.open, open)
    93  	}
    94  
    95  	stats := p.Stats()
    96  
    97  	if stats.ActiveCount != open {
    98  		d.t.Errorf("%s: active=%d, want %d", message, stats.ActiveCount, open)
    99  	}
   100  	if stats.IdleCount != open-inuse {
   101  		d.t.Errorf("%s: idle=%d, want %d", message, stats.IdleCount, open-inuse)
   102  	}
   103  
   104  	d.mu.Unlock()
   105  }
   106  
   107  func TestPoolReuse(t *testing.T) {
   108  	d := poolDialer{t: t}
   109  	p := &redis.Pool{
   110  		MaxIdle: 2,
   111  		Dial:    d.dial,
   112  	}
   113  
   114  	for i := 0; i < 10; i++ {
   115  		c1 := p.Get()
   116  		c1.Do("PING")
   117  		c2 := p.Get()
   118  		c2.Do("PING")
   119  		c1.Close()
   120  		c2.Close()
   121  	}
   122  
   123  	d.check("before close", p, 2, 2, 0)
   124  	p.Close()
   125  	d.check("after close", p, 2, 0, 0)
   126  }
   127  
   128  func TestPoolMaxIdle(t *testing.T) {
   129  	d := poolDialer{t: t}
   130  	p := &redis.Pool{
   131  		MaxIdle: 2,
   132  		Dial:    d.dial,
   133  	}
   134  	defer p.Close()
   135  
   136  	for i := 0; i < 10; i++ {
   137  		c1 := p.Get()
   138  		c1.Do("PING")
   139  		c2 := p.Get()
   140  		c2.Do("PING")
   141  		c3 := p.Get()
   142  		c3.Do("PING")
   143  		c1.Close()
   144  		c2.Close()
   145  		c3.Close()
   146  	}
   147  	d.check("before close", p, 12, 2, 0)
   148  	p.Close()
   149  	d.check("after close", p, 12, 0, 0)
   150  }
   151  
   152  func TestPoolError(t *testing.T) {
   153  	d := poolDialer{t: t}
   154  	p := &redis.Pool{
   155  		MaxIdle: 2,
   156  		Dial:    d.dial,
   157  	}
   158  	defer p.Close()
   159  
   160  	c := p.Get()
   161  	c.Do("ERR", io.EOF)
   162  	if c.Err() == nil {
   163  		t.Errorf("expected c.Err() != nil")
   164  	}
   165  	c.Close()
   166  
   167  	c = p.Get()
   168  	c.Do("ERR", io.EOF)
   169  	c.Close()
   170  
   171  	d.check(".", p, 2, 0, 0)
   172  }
   173  
   174  func TestPoolClose(t *testing.T) {
   175  	d := poolDialer{t: t}
   176  	p := &redis.Pool{
   177  		MaxIdle: 2,
   178  		Dial:    d.dial,
   179  	}
   180  	defer p.Close()
   181  
   182  	c1 := p.Get()
   183  	c1.Do("PING")
   184  	c2 := p.Get()
   185  	c2.Do("PING")
   186  	c3 := p.Get()
   187  	c3.Do("PING")
   188  
   189  	c1.Close()
   190  	if _, err := c1.Do("PING"); err == nil {
   191  		t.Errorf("expected error after connection closed")
   192  	}
   193  
   194  	c2.Close()
   195  	c2.Close()
   196  
   197  	p.Close()
   198  
   199  	d.check("after pool close", p, 3, 1, 1)
   200  
   201  	if _, err := c1.Do("PING"); err == nil {
   202  		t.Errorf("expected error after connection and pool closed")
   203  	}
   204  
   205  	c3.Close()
   206  
   207  	d.check("after conn close", p, 3, 0, 0)
   208  
   209  	c1 = p.Get()
   210  	if _, err := c1.Do("PING"); err == nil {
   211  		t.Errorf("expected error after pool closed")
   212  	}
   213  }
   214  
   215  func TestPoolClosedConn(t *testing.T) {
   216  	d := poolDialer{t: t}
   217  	p := &redis.Pool{
   218  		MaxIdle:     2,
   219  		IdleTimeout: 300 * time.Second,
   220  		Dial:        d.dial,
   221  	}
   222  	defer p.Close()
   223  	c := p.Get()
   224  	if c.Err() != nil {
   225  		t.Fatal("get failed")
   226  	}
   227  	c.Close()
   228  	if err := c.Err(); err == nil {
   229  		t.Fatal("Err on closed connection did not return error")
   230  	}
   231  	if _, err := c.Do("PING"); err == nil {
   232  		t.Fatal("Do on closed connection did not return error")
   233  	}
   234  	if err := c.Send("PING"); err == nil {
   235  		t.Fatal("Send on closed connection did not return error")
   236  	}
   237  	if err := c.Flush(); err == nil {
   238  		t.Fatal("Flush on closed connection did not return error")
   239  	}
   240  	if _, err := c.Receive(); err == nil {
   241  		t.Fatal("Receive on closed connection did not return error")
   242  	}
   243  }
   244  
   245  func TestPoolIdleTimeout(t *testing.T) {
   246  	d := poolDialer{t: t}
   247  	p := &redis.Pool{
   248  		MaxIdle:     2,
   249  		IdleTimeout: 300 * time.Second,
   250  		Dial:        d.dial,
   251  	}
   252  	defer p.Close()
   253  
   254  	now := time.Now()
   255  	redis.SetNowFunc(func() time.Time { return now })
   256  	defer redis.SetNowFunc(time.Now)
   257  
   258  	c := p.Get()
   259  	c.Do("PING")
   260  	c.Close()
   261  
   262  	d.check("1", p, 1, 1, 0)
   263  
   264  	now = now.Add(p.IdleTimeout + 1)
   265  
   266  	c = p.Get()
   267  	c.Do("PING")
   268  	c.Close()
   269  
   270  	d.check("2", p, 2, 1, 0)
   271  }
   272  
   273  func TestPoolMaxLifetime(t *testing.T) {
   274  	d := poolDialer{t: t}
   275  	p := &redis.Pool{
   276  		MaxIdle:         2,
   277  		MaxConnLifetime: 300 * time.Second,
   278  		Dial:            d.dial,
   279  	}
   280  	defer p.Close()
   281  
   282  	now := time.Now()
   283  	redis.SetNowFunc(func() time.Time { return now })
   284  	defer redis.SetNowFunc(time.Now)
   285  
   286  	c := p.Get()
   287  	c.Do("PING")
   288  	c.Close()
   289  
   290  	d.check("1", p, 1, 1, 0)
   291  
   292  	now = now.Add(p.MaxConnLifetime + 1)
   293  
   294  	c = p.Get()
   295  	c.Do("PING")
   296  	c.Close()
   297  
   298  	d.check("2", p, 2, 1, 0)
   299  }
   300  
   301  func TestPoolConcurrenSendReceive(t *testing.T) {
   302  	p := &redis.Pool{
   303  		Dial: redis.DialDefaultServer,
   304  	}
   305  	defer p.Close()
   306  
   307  	c := p.Get()
   308  	done := make(chan error, 1)
   309  	go func() {
   310  		_, err := c.Receive()
   311  		done <- err
   312  	}()
   313  	c.Send("PING")
   314  	c.Flush()
   315  	err := <-done
   316  	if err != nil {
   317  		t.Fatalf("Receive() returned error %v", err)
   318  	}
   319  	_, err = c.Do("")
   320  	if err != nil {
   321  		t.Fatalf("Do() returned error %v", err)
   322  	}
   323  	c.Close()
   324  }
   325  
   326  func TestPoolBorrowCheck(t *testing.T) {
   327  	d := poolDialer{t: t}
   328  	p := &redis.Pool{
   329  		MaxIdle:      2,
   330  		Dial:         d.dial,
   331  		TestOnBorrow: func(redis.Conn, time.Time) error { return redis.Error("BLAH") },
   332  	}
   333  	defer p.Close()
   334  
   335  	for i := 0; i < 10; i++ {
   336  		c := p.Get()
   337  		c.Do("PING")
   338  		c.Close()
   339  	}
   340  	d.check("1", p, 10, 1, 0)
   341  }
   342  
   343  func TestPoolMaxActive(t *testing.T) {
   344  	d := poolDialer{t: t}
   345  	p := &redis.Pool{
   346  		MaxIdle:   2,
   347  		MaxActive: 2,
   348  		Dial:      d.dial,
   349  	}
   350  	defer p.Close()
   351  
   352  	c1 := p.Get()
   353  	c1.Do("PING")
   354  	c2 := p.Get()
   355  	c2.Do("PING")
   356  
   357  	d.check("1", p, 2, 2, 2)
   358  
   359  	c3 := p.Get()
   360  	if _, err := c3.Do("PING"); err != redis.ErrPoolExhausted {
   361  		t.Errorf("expected pool exhausted")
   362  	}
   363  
   364  	c3.Close()
   365  	d.check("2", p, 2, 2, 2)
   366  	c2.Close()
   367  	d.check("3", p, 2, 2, 1)
   368  
   369  	c3 = p.Get()
   370  	if _, err := c3.Do("PING"); err != nil {
   371  		t.Errorf("expected good channel, err=%v", err)
   372  	}
   373  	c3.Close()
   374  
   375  	d.check("4", p, 2, 2, 1)
   376  }
   377  
   378  func TestPoolMonitorCleanup(t *testing.T) {
   379  	d := poolDialer{t: t}
   380  	p := &redis.Pool{
   381  		MaxIdle:   2,
   382  		MaxActive: 2,
   383  		Dial:      d.dial,
   384  	}
   385  	defer p.Close()
   386  
   387  	c := p.Get()
   388  	c.Send("MONITOR")
   389  	c.Close()
   390  
   391  	d.check("", p, 1, 0, 0)
   392  }
   393  
   394  func TestPoolPubSubCleanup(t *testing.T) {
   395  	d := poolDialer{t: t}
   396  	p := &redis.Pool{
   397  		MaxIdle:   2,
   398  		MaxActive: 2,
   399  		Dial:      d.dial,
   400  	}
   401  	defer p.Close()
   402  
   403  	c := p.Get()
   404  	c.Send("SUBSCRIBE", "x")
   405  	c.Close()
   406  
   407  	want := []string{"SUBSCRIBE", "UNSUBSCRIBE", "PUNSUBSCRIBE", "ECHO"}
   408  	if !reflect.DeepEqual(d.commands, want) {
   409  		t.Errorf("got commands %v, want %v", d.commands, want)
   410  	}
   411  	d.commands = nil
   412  
   413  	c = p.Get()
   414  	c.Send("PSUBSCRIBE", "x*")
   415  	c.Close()
   416  
   417  	want = []string{"PSUBSCRIBE", "UNSUBSCRIBE", "PUNSUBSCRIBE", "ECHO"}
   418  	if !reflect.DeepEqual(d.commands, want) {
   419  		t.Errorf("got commands %v, want %v", d.commands, want)
   420  	}
   421  	d.commands = nil
   422  }
   423  
   424  func TestPoolTransactionCleanup(t *testing.T) {
   425  	d := poolDialer{t: t}
   426  	p := &redis.Pool{
   427  		MaxIdle:   2,
   428  		MaxActive: 2,
   429  		Dial:      d.dial,
   430  	}
   431  	defer p.Close()
   432  
   433  	c := p.Get()
   434  	c.Do("WATCH", "key")
   435  	c.Do("PING")
   436  	c.Close()
   437  
   438  	want := []string{"WATCH", "PING", "UNWATCH"}
   439  	if !reflect.DeepEqual(d.commands, want) {
   440  		t.Errorf("got commands %v, want %v", d.commands, want)
   441  	}
   442  	d.commands = nil
   443  
   444  	c = p.Get()
   445  	c.Do("WATCH", "key")
   446  	c.Do("UNWATCH")
   447  	c.Do("PING")
   448  	c.Close()
   449  
   450  	want = []string{"WATCH", "UNWATCH", "PING"}
   451  	if !reflect.DeepEqual(d.commands, want) {
   452  		t.Errorf("got commands %v, want %v", d.commands, want)
   453  	}
   454  	d.commands = nil
   455  
   456  	c = p.Get()
   457  	c.Do("WATCH", "key")
   458  	c.Do("MULTI")
   459  	c.Do("PING")
   460  	c.Close()
   461  
   462  	want = []string{"WATCH", "MULTI", "PING", "DISCARD"}
   463  	if !reflect.DeepEqual(d.commands, want) {
   464  		t.Errorf("got commands %v, want %v", d.commands, want)
   465  	}
   466  	d.commands = nil
   467  
   468  	c = p.Get()
   469  	c.Do("WATCH", "key")
   470  	c.Do("MULTI")
   471  	c.Do("DISCARD")
   472  	c.Do("PING")
   473  	c.Close()
   474  
   475  	want = []string{"WATCH", "MULTI", "DISCARD", "PING"}
   476  	if !reflect.DeepEqual(d.commands, want) {
   477  		t.Errorf("got commands %v, want %v", d.commands, want)
   478  	}
   479  	d.commands = nil
   480  
   481  	c = p.Get()
   482  	c.Do("WATCH", "key")
   483  	c.Do("MULTI")
   484  	c.Do("EXEC")
   485  	c.Do("PING")
   486  	c.Close()
   487  
   488  	want = []string{"WATCH", "MULTI", "EXEC", "PING"}
   489  	if !reflect.DeepEqual(d.commands, want) {
   490  		t.Errorf("got commands %v, want %v", d.commands, want)
   491  	}
   492  	d.commands = nil
   493  }
   494  
   495  func startGoroutines(p *redis.Pool, cmd string, args ...interface{}) chan error {
   496  	errs := make(chan error, 10)
   497  	for i := 0; i < cap(errs); i++ {
   498  		go func() {
   499  			c := p.Get()
   500  			_, err := c.Do(cmd, args...)
   501  			c.Close()
   502  			errs <- err
   503  		}()
   504  	}
   505  
   506  	return errs
   507  }
   508  
   509  func TestWaitPool(t *testing.T) {
   510  	d := poolDialer{t: t}
   511  	p := &redis.Pool{
   512  		MaxIdle:   1,
   513  		MaxActive: 1,
   514  		Dial:      d.dial,
   515  		Wait:      true,
   516  	}
   517  	defer p.Close()
   518  
   519  	c := p.Get()
   520  	errs := startGoroutines(p, "PING")
   521  	d.check("before close", p, 1, 1, 1)
   522  	c.Close()
   523  	timeout := time.After(2 * time.Second)
   524  	for i := 0; i < cap(errs); i++ {
   525  		select {
   526  		case err := <-errs:
   527  			if err != nil {
   528  				t.Fatal(err)
   529  			}
   530  		case <-timeout:
   531  			t.Fatalf("timeout waiting for blocked goroutine %d", i)
   532  		}
   533  	}
   534  	d.check("done", p, 1, 1, 0)
   535  }
   536  
   537  func TestWaitPoolClose(t *testing.T) {
   538  	d := poolDialer{t: t}
   539  	p := &redis.Pool{
   540  		MaxIdle:   1,
   541  		MaxActive: 1,
   542  		Dial:      d.dial,
   543  		Wait:      true,
   544  	}
   545  	defer p.Close()
   546  
   547  	c := p.Get()
   548  	if _, err := c.Do("PING"); err != nil {
   549  		t.Fatal(err)
   550  	}
   551  	errs := startGoroutines(p, "PING")
   552  	d.check("before close", p, 1, 1, 1)
   553  	p.Close()
   554  	timeout := time.After(2 * time.Second)
   555  	for i := 0; i < cap(errs); i++ {
   556  		select {
   557  		case err := <-errs:
   558  			switch err {
   559  			case nil:
   560  				t.Fatal("blocked goroutine did not get error")
   561  			case redis.ErrPoolExhausted:
   562  				t.Fatal("blocked goroutine got pool exhausted error")
   563  			}
   564  		case <-timeout:
   565  			t.Fatal("timeout waiting for blocked goroutine")
   566  		}
   567  	}
   568  	c.Close()
   569  	d.check("done", p, 1, 0, 0)
   570  }
   571  
   572  func TestWaitPoolCommandError(t *testing.T) {
   573  	testErr := errors.New("test")
   574  	d := poolDialer{t: t}
   575  	p := &redis.Pool{
   576  		MaxIdle:   1,
   577  		MaxActive: 1,
   578  		Dial:      d.dial,
   579  		Wait:      true,
   580  	}
   581  	defer p.Close()
   582  
   583  	c := p.Get()
   584  	errs := startGoroutines(p, "ERR", testErr)
   585  	d.check("before close", p, 1, 1, 1)
   586  	c.Close()
   587  	timeout := time.After(2 * time.Second)
   588  	for i := 0; i < cap(errs); i++ {
   589  		select {
   590  		case err := <-errs:
   591  			if err != nil {
   592  				t.Fatal(err)
   593  			}
   594  		case <-timeout:
   595  			t.Fatalf("timeout waiting for blocked goroutine %d", i)
   596  		}
   597  	}
   598  	d.check("done", p, cap(errs), 0, 0)
   599  }
   600  
   601  func TestWaitPoolDialError(t *testing.T) {
   602  	testErr := errors.New("test")
   603  	d := poolDialer{t: t}
   604  	p := &redis.Pool{
   605  		MaxIdle:   1,
   606  		MaxActive: 1,
   607  		Dial:      d.dial,
   608  		Wait:      true,
   609  	}
   610  	defer p.Close()
   611  
   612  	c := p.Get()
   613  	errs := startGoroutines(p, "ERR", testErr)
   614  	d.check("before close", p, 1, 1, 1)
   615  
   616  	d.dialErr = errors.New("dial")
   617  	c.Close()
   618  
   619  	nilCount := 0
   620  	errCount := 0
   621  	timeout := time.After(2 * time.Second)
   622  	for i := 0; i < cap(errs); i++ {
   623  		select {
   624  		case err := <-errs:
   625  			switch err {
   626  			case nil:
   627  				nilCount++
   628  			case d.dialErr:
   629  				errCount++
   630  			default:
   631  				t.Fatalf("expected dial error or nil, got %v", err)
   632  			}
   633  		case <-timeout:
   634  			t.Fatalf("timeout waiting for blocked goroutine %d", i)
   635  		}
   636  	}
   637  	if nilCount != 1 {
   638  		t.Errorf("expected one nil error, got %d", nilCount)
   639  	}
   640  	if errCount != cap(errs)-1 {
   641  		t.Errorf("expected %d dial errors, got %d", cap(errs)-1, errCount)
   642  	}
   643  	d.check("done", p, cap(errs), 0, 0)
   644  }
   645  
   646  // Borrowing requires us to iterate over the idle connections, unlock the pool,
   647  // and perform a blocking operation to check the connection still works. If
   648  // TestOnBorrow fails, we must reacquire the lock and continue iteration. This
   649  // test ensures that iteration will work correctly if multiple threads are
   650  // iterating simultaneously.
   651  func TestLocking_TestOnBorrowFails_PoolDoesntCrash(t *testing.T) {
   652  	const count = 100
   653  
   654  	// First we'll Create a pool where the pilfering of idle connections fails.
   655  	d := poolDialer{t: t}
   656  	p := &redis.Pool{
   657  		MaxIdle:   count,
   658  		MaxActive: count,
   659  		Dial:      d.dial,
   660  		TestOnBorrow: func(c redis.Conn, t time.Time) error {
   661  			return errors.New("No way back into the real world.")
   662  		},
   663  	}
   664  	defer p.Close()
   665  
   666  	// Fill the pool with idle connections.
   667  	conns := make([]redis.Conn, count)
   668  	for i := range conns {
   669  		conns[i] = p.Get()
   670  	}
   671  	for i := range conns {
   672  		conns[i].Close()
   673  	}
   674  
   675  	// Spawn a bunch of goroutines to thrash the pool.
   676  	var wg sync.WaitGroup
   677  	wg.Add(count)
   678  	for i := 0; i < count; i++ {
   679  		go func() {
   680  			c := p.Get()
   681  			if c.Err() != nil {
   682  				t.Errorf("pool get failed: %v", c.Err())
   683  			}
   684  			c.Close()
   685  			wg.Done()
   686  		}()
   687  	}
   688  	wg.Wait()
   689  	if d.dialed != count*2 {
   690  		t.Errorf("Expected %d dials, got %d", count*2, d.dialed)
   691  	}
   692  }
   693  
   694  func BenchmarkPoolGet(b *testing.B) {
   695  	b.StopTimer()
   696  	p := redis.Pool{Dial: redis.DialDefaultServer, MaxIdle: 2}
   697  	c := p.Get()
   698  	if err := c.Err(); err != nil {
   699  		b.Fatal(err)
   700  	}
   701  	c.Close()
   702  	defer p.Close()
   703  	b.StartTimer()
   704  	for i := 0; i < b.N; i++ {
   705  		c = p.Get()
   706  		c.Close()
   707  	}
   708  }
   709  
   710  func BenchmarkPoolGetErr(b *testing.B) {
   711  	b.StopTimer()
   712  	p := redis.Pool{Dial: redis.DialDefaultServer, MaxIdle: 2}
   713  	c := p.Get()
   714  	if err := c.Err(); err != nil {
   715  		b.Fatal(err)
   716  	}
   717  	c.Close()
   718  	defer p.Close()
   719  	b.StartTimer()
   720  	for i := 0; i < b.N; i++ {
   721  		c = p.Get()
   722  		if err := c.Err(); err != nil {
   723  			b.Fatal(err)
   724  		}
   725  		c.Close()
   726  	}
   727  }
   728  
   729  func BenchmarkPoolGetPing(b *testing.B) {
   730  	b.StopTimer()
   731  	p := redis.Pool{Dial: redis.DialDefaultServer, MaxIdle: 2}
   732  	c := p.Get()
   733  	if err := c.Err(); err != nil {
   734  		b.Fatal(err)
   735  	}
   736  	c.Close()
   737  	defer p.Close()
   738  	b.StartTimer()
   739  	for i := 0; i < b.N; i++ {
   740  		c = p.Get()
   741  		if _, err := c.Do("PING"); err != nil {
   742  			b.Fatal(err)
   743  		}
   744  		c.Close()
   745  	}
   746  }
   747  

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