Golang mgo.GetStats函数代码示例

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

	coll := session.DB("mydb").C("mycoll")

	// Insert an element with a predefined key.
	err = coll.Insert(M{"_id": 1})
	c.Assert(err, IsNil)

	mgo.ResetStats()

	// Session should be safe by default, so inserting it again must fail.
	err = coll.Insert(M{"_id": 1})
	c.Assert(err, Matches, "E11000 duplicate.*")
	c.Assert(err.(*mgo.LastError).Code, Equals, 11000)

	// It must have sent two operations (INSERT_OP + getLastError QUERY_OP)
	stats := mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 2)

	mgo.ResetStats()

	// If we disable safety, though, it won't complain.
	session.SetSafe(nil)
	err = coll.Insert(M{"_id": 1})
	c.Assert(err, IsNil)

	// Must have sent a single operation this time (just the INSERT_OP)
	stats = mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 1)
}

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.Mongo("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) TestPrefetching(c *C) {
	session, err := mgo.Mongo("localhost:40001")
	c.Assert(err, IsNil)
	defer session.Close()

	coll := session.DB("mydb").C("mycoll")

	docs := make([]interface{}, 200)
	for i := 0; i != 200; i++ {
		docs[i] = M{"n": i}
	}
	coll.Insert(docs...)

	// Same test three times.  Once with prefetching via query, then with the
	// default prefetching, and a third time tweaking the default settings in
	// the session.
	for testi := 0; testi != 3; testi++ {
		mgo.ResetStats()

		var iter *mgo.Iter
		var nextn int

		switch testi {
		case 0: // First, using query methods.
			iter, err = coll.Find(M{}).Prefetch(0.27).Batch(100).Iter()
			c.Assert(err, IsNil)
			nextn = 73

		case 1: // Then, the default session value.
			session.SetBatch(100)
			iter, err = coll.Find(M{}).Iter()
			c.Assert(err, IsNil)
			nextn = 75

		case 2: // Then, tweaking the session value.
			session.SetBatch(100)
			session.SetPrefetch(0.27)
			iter, err = coll.Find(M{}).Iter()
			c.Assert(err, IsNil)
			nextn = 73
		}

		result := struct{ N int }{}
		for i := 0; i != nextn; i++ {
			iter.Next(&result)
		}

		stats := mgo.GetStats()
		c.Assert(stats.ReceivedDocs, Equals, 100)

		iter.Next(&result)

		// Ping the database just to wait for the fetch above
		// to get delivered.
		session.Run("ping", M{}) // XXX Should support nil here.

		stats = mgo.GetStats()
		c.Assert(stats.ReceivedDocs, Equals, 201) // 200 + the ping result
	}
}

func (s *S) TestNewSession(c *C) {
	session, err := mgo.Mongo("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.Mongo("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) TestSetModeMonotonicAfterStrong(c *C) {
	// Test that a strong session shifting to a monotonic
	// one preserves the socket untouched.

	session, err := mgo.Mongo("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) TestDirect(c *C) {
	session, err := mgo.Mongo("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)

	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(M{"test": 1})
	c.Assert(err, Matches, "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) 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) TestFindIterLimitWithBatch(c *C) {
	session, err := mgo.Mongo("localhost:40001")
	c.Assert(err, IsNil)
	defer session.Close()

	coll := session.DB("mydb").C("mycoll")

	ns := []int{40, 41, 42, 43, 44, 45, 46}
	for _, n := range ns {
		coll.Insert(M{"n": n})
	}

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

	session.Refresh() // Release socket.

	mgo.ResetStats()

	query := coll.Find(M{"n": M{"$gte": 42}}).Sort(M{"$natural": 1}).Limit(3).Batch(2)
	iter, err := query.Iter()
	c.Assert(err, IsNil)

	result := struct{ N int }{}
	for i := 2; i < 5; i++ {
		err = iter.Next(&result)
		c.Assert(err, IsNil)
		c.Assert(result.N, Equals, ns[i])
		if i == 3 {
			stats := mgo.GetStats()
			c.Assert(stats.ReceivedDocs, Equals, 2)
		}
	}

	err = iter.Next(&result)
	c.Assert(err == mgo.NotFound, Equals, true)

	session.Refresh() // Release socket.

	stats := mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 2)     // 1*QUERY_OP + 1*GET_MORE_OP
	c.Assert(stats.ReceivedOps, Equals, 2) // and its REPLY_OPs
	c.Assert(stats.ReceivedDocs, Equals, 3)
	c.Assert(stats.SocketsInUse, Equals, 0)
}

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.Mongo("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)
}

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

	coll := session.DB("mydb").C("mycoll")

	ns := []int{40, 41, 42, 43, 44, 45, 46}
	for _, n := range ns {
		coll.Insert(M{"n": n})
	}

	session.Refresh() // Release socket.

	mgo.ResetStats()

	query := coll.Find(M{"n": M{"$gte": 42}}).Sort(M{"$natural": 1}).Prefetch(0).Batch(2)
	iter, err := query.Iter()
	c.Assert(err, IsNil)

	i := 2
	var result *struct{ N int }
	err = iter.For(&result, func() os.Error {
		c.Assert(i < 7, Equals, true)
		c.Assert(result.N, Equals, ns[i])
		if i == 1 {
			stats := mgo.GetStats()
			c.Assert(stats.ReceivedDocs, Equals, 2)
		}
		i++
		return nil
	})
	c.Assert(err, IsNil)

	session.Refresh() // Release socket.

	stats := mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 3)     // 1*QUERY_OP + 2*GET_MORE_OP
	c.Assert(stats.ReceivedOps, Equals, 3) // and their REPLY_OPs.
	c.Assert(stats.ReceivedDocs, Equals, 5)
	c.Assert(stats.SocketsInUse, Equals, 0)
}

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

	coll := session.DB("mydb").C("mycoll")

	err = coll.EnsureIndexKey([]string{"a"})
	c.Assert(err, IsNil)

	mgo.ResetStats()

	// Second EnsureIndex should be cached and do nothing.
	err = coll.EnsureIndexKey([]string{"a"})
	c.Assert(err, IsNil)

	stats := mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 0)

	// Resetting the cache should make it contact the server again.
	session.ResetIndexCache()

	err = coll.EnsureIndexKey([]string{"a"})
	c.Assert(err, IsNil)

	stats = mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 2)

	// Dropping the index should also drop the cached index key.
	err = coll.DropIndex([]string{"a"})
	c.Assert(err, IsNil)

	mgo.ResetStats()

	err = coll.EnsureIndexKey([]string{"a"})
	c.Assert(err, IsNil)

	stats = mgo.GetStats()
	c.Assert(stats.SentOps, Equals, 2)
}