Golang mgo.GetStats函數代碼示例

func (s *S) TestTopologySyncWithSlaveSeed(c *C) {
	// That's supposed to be a slave. Must run discovery
	// and find out master to insert successfully.
	session, err := mgo.Dial("localhost:40012")
	c.Assert(err, IsNil)
	defer session.Close()

	coll := session.DB("mydb").C("mycoll")
	coll.Insert(M{"a": 1, "b": 2})

	result := struct{ Ok bool }{}
	err = session.Run("getLastError", &result)
	c.Assert(err, IsNil)
	c.Assert(result.Ok, Equals, true)

	// One connection to each during discovery. Master
	// socket recycled for insert.
	stats := mgo.GetStats()
	c.Assert(stats.MasterConns, Equals, 1)
	c.Assert(stats.SlaveConns, Equals, 2)

	// Only one socket reference alive, in the master socket owned
	// by the above session.
	c.Assert(stats.SocketsInUse, Equals, 1)

	// Refresh it, and it must be gone.
	session.Refresh()
	stats = mgo.GetStats()
	c.Assert(stats.SocketsInUse, Equals, 0)
}

func (s *S) TearDownTest(c *C) {
	if s.stopped {
		s.StartAll()
	}
	for _, host := range s.frozen {
		if host != "" {
			s.Thaw(host)
		}
	}
	var stats mgo.Stats
	for i := 0; ; i++ {
		stats = mgo.GetStats()
		if stats.SocketsInUse == 0 && stats.SocketsAlive == 0 {
			break
		}
		if i == 20 {
			c.Fatal("Test left sockets in a dirty state")
		}
		c.Logf("Waiting for sockets to die: %d in use, %d alive", stats.SocketsInUse, stats.SocketsAlive)
		time.Sleep(500 * time.Millisecond)
	}
	for i := 0; ; i++ {
		stats = mgo.GetStats()
		if stats.Clusters == 0 {
			break
		}
		if i == 60 {
			c.Fatal("Test left clusters alive")
		}
		c.Logf("Waiting for clusters to die: %d alive", stats.Clusters)
		time.Sleep(1 * time.Second)
	}
}

func (s *S) TestNewSession(c *C) {
	session, err := mgo.Dial("localhost:40001")
	c.Assert(err, IsNil)
	defer session.Close()

	// Do a dummy operation to wait for connection.
	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"_id": 1})
	c.Assert(err, IsNil)

	// Tweak safety and query settings to ensure other has copied those.
	session.SetSafe(nil)
	session.SetBatch(-1)
	other := session.New()
	defer other.Close()
	session.SetSafe(&mgo.Safe{})

	// Clone was copied while session was unsafe, so no errors.
	otherColl := other.DB("mydb").C("mycoll")
	err = otherColl.Insert(M{"_id": 1})
	c.Assert(err, IsNil)

	// Original session was made safe again.
	err = coll.Insert(M{"_id": 1})
	c.Assert(err, NotNil)

	// With New(), each session has its own socket now.
	stats := mgo.GetStats()
	c.Assert(stats.MasterConns, Equals, 2)
	c.Assert(stats.SocketsInUse, Equals, 2)

	// Ensure query parameters were cloned.
	err = otherColl.Insert(M{"_id": 2})
	c.Assert(err, IsNil)

	// Ping the database to ensure the nonce has been received already.
	c.Assert(other.Ping(), IsNil)

	mgo.ResetStats()

	iter := otherColl.Find(M{}).Iter()
	c.Assert(err, IsNil)

	m := M{}
	ok := iter.Next(m)
	c.Assert(ok, Equals, true)
	err = iter.Err()
	c.Assert(err, IsNil)

	// If Batch(-1) is in effect, a single document must have been received.
	stats = mgo.GetStats()
	c.Assert(stats.ReceivedDocs, Equals, 1)
}

func (s *S) TestAuthLoginCachingAcrossPoolWithLogout(c *C) {
	// Now verify that logouts are properly flushed if they
	// are not revalidated after leaving the pool.

	session, err := mgo.Dial("localhost:40002")
	c.Assert(err, IsNil)
	defer session.Close()

	admindb := session.DB("admin")
	err = admindb.Login("root", "rapadura")
	c.Assert(err, IsNil)

	// Add another user to test the logout case at the same time.
	mydb := session.DB("mydb")
	err = mydb.AddUser("myuser", "mypass", true)
	c.Assert(err, IsNil)

	err = mydb.Login("myuser", "mypass")
	c.Assert(err, IsNil)

	// Just some data to query later.
	err = session.DB("mydb").C("mycoll").Insert(M{"n": 1})
	c.Assert(err, IsNil)

	// Give socket back to pool.
	session.Refresh()

	// Brand new session, should use socket from the pool.
	other := session.New()
	defer other.Close()

	oldStats := mgo.GetStats()

	err = other.DB("mydb").Login("myuser", "mypass")
	c.Assert(err, IsNil)

	// Login was cached, so no ops.
	newStats := mgo.GetStats()
	c.Assert(newStats.SentOps, Equals, oldStats.SentOps)

	// Can't write, since root has been implicitly logged out
	// when the collection went into the pool, and not revalidated.
	err = other.DB("mydb").C("mycoll").Insert(M{"n": 1})
	c.Assert(err, ErrorMatches, "unauthorized")

	// But can read due to the revalidated myuser login.
	result := struct{ N int }{}
	err = other.DB("mydb").C("mycoll").Find(nil).One(&result)
	c.Assert(err, IsNil)
	c.Assert(result.N, Equals, 1)
}

func (s *S) TestAuthLoginCachingAcrossPool(c *C) {
	// Logins are cached even when the conenction goes back
	// into the pool.

	session, err := mgo.Dial("localhost:40002")
	c.Assert(err, IsNil)
	defer session.Close()

	admindb := session.DB("admin")
	err = admindb.Login("root", "rapadura")
	c.Assert(err, IsNil)

	// Add another user to test the logout case at the same time.
	mydb := session.DB("mydb")
	err = mydb.AddUser("myuser", "mypass", false)
	c.Assert(err, IsNil)

	err = mydb.Login("myuser", "mypass")
	c.Assert(err, IsNil)

	// Logout root explicitly, to test both cases.
	admindb.Logout()

	// Give socket back to pool.
	session.Refresh()

	// Brand new session, should use socket from the pool.
	other := session.New()
	defer other.Close()

	oldStats := mgo.GetStats()

	err = other.DB("admin").Login("root", "rapadura")
	c.Assert(err, IsNil)
	err = other.DB("mydb").Login("myuser", "mypass")
	c.Assert(err, IsNil)

	// Both logins were cached, so no ops.
	newStats := mgo.GetStats()
	c.Assert(newStats.SentOps, Equals, oldStats.SentOps)

	// And they actually worked.
	err = other.DB("mydb").C("mycoll").Insert(M{"n": 1})
	c.Assert(err, IsNil)

	other.DB("admin").Logout()

	err = other.DB("mydb").C("mycoll").Insert(M{"n": 1})
	c.Assert(err, IsNil)
}

func (s *S) TestPreserveSocketCountOnSync(c *C) {
	if *fast {
		c.Skip("-fast")
	}

	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	stats := mgo.GetStats()
	for stats.MasterConns+stats.SlaveConns != 3 {
		stats = mgo.GetStats()
		c.Log("Waiting for all connections to be established...")
		time.Sleep(5e8)
	}

	c.Assert(stats.SocketsAlive, Equals, 3)

	// Kill the master (with rs1, 'a' is always the master).
	s.Stop("localhost:40011")

	// Wait for the logic to run for a bit and bring it back.
	go func() {
		time.Sleep(5e9)
		s.StartAll()
	}()

	// Do an action to kick the resync logic in, and also to
	// wait until the cluster recognizes the server is back.
	result := struct{ Ok bool }{}
	err = session.Run("getLastError", &result)
	c.Assert(err, IsNil)
	c.Assert(result.Ok, Equals, true)

	for i := 0; i != 20; i++ {
		stats = mgo.GetStats()
		if stats.SocketsAlive == 3 {
			break
		}
		c.Logf("Waiting for 3 sockets alive, have %d", stats.SocketsAlive)
		time.Sleep(5e8)
	}

	// Ensure the number of sockets is preserved after syncing.
	stats = mgo.GetStats()
	c.Assert(stats.SocketsAlive, Equals, 3)
	c.Assert(stats.SocketsInUse, Equals, 1)
	c.Assert(stats.SocketRefs, Equals, 1)
}

func (s *S) TestDirect(c *C) {
	session, err := mgo.Dial("localhost:40012?connect=direct")
	c.Assert(err, IsNil)
	defer session.Close()

	// We know that server is a slave.
	session.SetMode(mgo.Monotonic, true)

	result := &struct{ Host string }{}
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)
	c.Assert(strings.HasSuffix(result.Host, ":40012"), Equals, true)

	stats := mgo.GetStats()
	c.Assert(stats.SocketsAlive, Equals, 1)
	c.Assert(stats.SocketsInUse, Equals, 1)
	c.Assert(stats.SocketRefs, Equals, 1)

	// We've got no master, so it'll timeout.
	session.SetSyncTimeout(5e8 * time.Nanosecond)

	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"test": 1})
	c.Assert(err, ErrorMatches, "no reachable servers")

	// Slave is still reachable.
	result.Host = ""
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)
	c.Assert(strings.HasSuffix(result.Host, ":40012"), Equals, true)
}

func (s *S) TestSetModeMonotonicAfterStrong(c *C) {
	// Test that a strong session shifting to a monotonic
	// one preserves the socket untouched.

	session, err := mgo.Dial("localhost:40012")
	c.Assert(err, IsNil)
	defer session.Close()

	// Insert something to force a connection to the master.
	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"a": 1})
	c.Assert(err, IsNil)

	session.SetMode(mgo.Monotonic, false)

	// Wait since the sync also uses sockets.
	for len(session.LiveServers()) != 3 {
		c.Log("Waiting for cluster sync to finish...")
		time.Sleep(5e8)
	}

	// Master socket should still be reserved.
	stats := mgo.GetStats()
	c.Assert(stats.SocketsInUse, Equals, 1)

	// Confirm it's the master even though it's Monotonic by now.
	result := M{}
	cmd := session.DB("admin").C("$cmd")
	err = cmd.Find(M{"ismaster": 1}).One(&result)
	c.Assert(err, IsNil)
	c.Assert(result["ismaster"], Equals, true)
}

func (s *S) TestAuthLoginTwiceDoesNothing(c *C) {
	session, err := mgo.Dial("localhost:40002")
	c.Assert(err, IsNil)
	defer session.Close()

	admindb := session.DB("admin")
	err = admindb.Login("root", "rapadura")
	c.Assert(err, IsNil)

	oldStats := mgo.GetStats()

	err = admindb.Login("root", "rapadura")
	c.Assert(err, IsNil)

	newStats := mgo.GetStats()
	c.Assert(newStats.SentOps, Equals, oldStats.SentOps)
}

func (s *S) TestSocketLimit(c *C) {
	if *fast {
		c.Skip("-fast")
	}
	const socketLimit = 64
	restore := mgo.HackSocketsPerServer(socketLimit)
	defer restore()

	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	stats := mgo.GetStats()
	for stats.MasterConns+stats.SlaveConns != 3 {
		stats = mgo.GetStats()
		c.Log("Waiting for all connections to be established...")
		time.Sleep(5e8)
	}
	c.Assert(stats.SocketsAlive, Equals, 3)

	// Consume the whole limit for the master.
	var master []*mgo.Session
	for i := 0; i < socketLimit; i++ {
		s := session.Copy()
		defer s.Close()
		err := s.Ping()
		c.Assert(err, IsNil)
		master = append(master, s)
	}

	before := time.Now()
	go func() {
		time.Sleep(3e9)
		master[0].Refresh()
	}()

	// Now a single ping must block, since it would need another
	// connection to the master, over the limit. Once the goroutine
	// above releases its socket, it should move on.
	session.Ping()
	delay := time.Now().Sub(before)
	c.Assert(delay > 3e9, Equals, true)
	c.Assert(delay < 6e9, Equals, true)
}

func (s *S) TestSetModeMonotonic(c *C) {
	// Must necessarily connect to a slave, otherwise the
	// master connection will be available first.
	session, err := mgo.Dial("localhost:40012")
	c.Assert(err, IsNil)
	defer session.Close()

	session.SetMode(mgo.Monotonic, false)

	c.Assert(session.Mode(), Equals, mgo.Monotonic)

	result := M{}
	cmd := session.DB("admin").C("$cmd")
	err = cmd.Find(M{"ismaster": 1}).One(&result)
	c.Assert(err, IsNil)
	c.Assert(result["ismaster"], Equals, false)

	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"a": 1})
	c.Assert(err, IsNil)

	result = M{}
	err = cmd.Find(M{"ismaster": 1}).One(&result)
	c.Assert(err, IsNil)
	c.Assert(result["ismaster"], Equals, true)

	// Wait since the sync also uses sockets.
	for len(session.LiveServers()) != 3 {
		c.Log("Waiting for cluster sync to finish...")
		time.Sleep(5e8)
	}

	stats := mgo.GetStats()
	c.Assert(stats.MasterConns, Equals, 1)
	c.Assert(stats.SlaveConns, Equals, 2)
	c.Assert(stats.SocketsInUse, Equals, 1)

	session.SetMode(mgo.Monotonic, true)

	stats = mgo.GetStats()
	c.Assert(stats.SocketsInUse, Equals, 0)
}

// Connect to the master of a deployment with a single server,
// run an insert, and then ensure the insert worked and that a
// single connection was established.
func (s *S) TestTopologySyncWithSingleMaster(c *C) {
	// Use hostname here rather than IP, to make things trickier.
	session, err := mgo.Dial("localhost:40001")
	c.Assert(err, IsNil)
	defer session.Close()

	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"a": 1, "b": 2})
	c.Assert(err, IsNil)

	// One connection used for discovery. Master socket recycled for
	// insert. Socket is reserved after insert.
	stats := mgo.GetStats()
	c.Assert(stats.MasterConns, Equals, 1)
	c.Assert(stats.SlaveConns, Equals, 0)
	c.Assert(stats.SocketsInUse, Equals, 1)

	// Refresh session and socket must be released.
	session.Refresh()
	stats = mgo.GetStats()
	c.Assert(stats.SocketsInUse, Equals, 0)
}

func (s *S) TearDownTest(c *C) {
	if s.stopped {
		s.StartAll()
	}
	for i := 0; ; i++ {
		stats := mgo.GetStats()
		if stats.SocketsInUse == 0 && stats.SocketsAlive == 0 {
			break
		}
		if i == 20 {
			c.Fatal("Test left sockets in a dirty state")
		}
		c.Logf("Waiting for sockets to die: %d in use, %d alive", stats.SocketsInUse, stats.SocketsAlive)
		time.Sleep(5e8)
	}
}

func (s *S) TestDirect(c *C) {
	session, err := mgo.Dial("localhost:40012?connect=direct")
	c.Assert(err, IsNil)
	defer session.Close()

	// We know that server is a slave.
	session.SetMode(mgo.Monotonic, true)

	result := &struct{ Host string }{}
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)
	c.Assert(strings.HasSuffix(result.Host, ":40012"), Equals, true)

	stats := mgo.GetStats()
	c.Assert(stats.SocketsAlive, Equals, 1)
	c.Assert(stats.SocketsInUse, Equals, 1)
	c.Assert(stats.SocketRefs, Equals, 1)

	// We've got no master, so it'll timeout.
	session.SetSyncTimeout(5e8 * time.Nanosecond)

	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"test": 1})
	c.Assert(err, ErrorMatches, "no reachable servers")

	// Writing to the local database is okay.
	coll = session.DB("local").C("mycoll")
	defer coll.RemoveAll(nil)
	id := bson.NewObjectId()
	err = coll.Insert(M{"_id": id})
	c.Assert(err, IsNil)

	// Data was stored in the right server.
	n, err := coll.Find(M{"_id": id}).Count()
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 1)

	// Server hasn't changed.
	result.Host = ""
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)
	c.Assert(strings.HasSuffix(result.Host, ":40012"), Equals, true)
}

func (s *S) TestSetModeStrongAfterMonotonic(c *C) {
	// Test that shifting from Monotonic to Strong while
	// using a slave socket will keep the socket reserved
	// until the master socket is necessary, so that no
	// switch over occurs unless it's actually necessary.

	// Must necessarily connect to a slave, otherwise the
	// master connection will be available first.
	session, err := mgo.Dial("localhost:40012")
	c.Assert(err, IsNil)
	defer session.Close()

	session.SetMode(mgo.Monotonic, false)

	// Ensure we're talking to a slave, and reserve the socket.
	result := M{}
	err = session.Run("ismaster", &result)
	c.Assert(err, IsNil)
	c.Assert(result["ismaster"], Equals, false)

	// Switch to a Strong session.
	session.SetMode(mgo.Strong, false)

	// Wait since the sync also uses sockets.
	for len(session.LiveServers()) != 3 {
		c.Log("Waiting for cluster sync to finish...")
		time.Sleep(5e8)
	}

	// Slave socket should still be reserved.
	stats := mgo.GetStats()
	c.Assert(stats.SocketsInUse, Equals, 1)

	// But any operation will switch it to the master.
	result = M{}
	err = session.Run("ismaster", &result)
	c.Assert(err, IsNil)
	c.Assert(result["ismaster"], Equals, true)
}