Golang mgo.Dial函數代碼示例

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

	// Dial the shard.
	session, err := mgo.Dial("localhost:40203")
	c.Assert(err, IsNil)
	defer session.Close()

	// Login and insert something to make it more realistic.
	session.DB("admin").Login("root", "rapadura")
	coll := session.DB("mydb").C("mycoll")
	err = coll.Insert(bson.M{"n": 1})
	c.Assert(err, IsNil)

	// Dial the replica set to figure the master out.
	rs, err := mgo.Dial("root:[email protected]:40031")
	c.Assert(err, IsNil)
	defer rs.Close()

	// With strong consistency, this will open a socket to the master.
	result := &struct{ Host string }{}
	err = rs.Run("serverStatus", result)
	c.Assert(err, IsNil)

	// Kill the master.
	host := result.Host
	s.Stop(host)

	// This must fail, since the connection was broken.
	err = rs.Run("serverStatus", result)
	c.Assert(err, Equals, io.EOF)

	// This won't work because the master just died.
	err = coll.Insert(bson.M{"n": 2})
	c.Assert(err, NotNil)

	// Refresh session and wait for re-election.
	session.Refresh()
	for i := 0; i < 60; i++ {
		err = coll.Insert(bson.M{"n": 3})
		if err == nil {
			break
		}
		c.Logf("Waiting for replica set to elect a new master. Last error: %v", err)
		time.Sleep(500 * time.Millisecond)
	}
	c.Assert(err, IsNil)

	count, err := coll.Count()
	c.Assert(count > 1, 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) TestSelectServers(c *C) {
	if !s.versionAtLeast(2, 2) {
		c.Skip("read preferences introduced in 2.2")
	}

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

	session.SetMode(mgo.Eventual, true)

	var result struct{ Host string }

	session.Refresh()
	session.SelectServers(bson.D{{"rs1", "b"}})
	err = session.Run("serverStatus", &result)
	c.Assert(err, IsNil)
	c.Assert(hostPort(result.Host), Equals, "40012")

	session.Refresh()
	session.SelectServers(bson.D{{"rs1", "c"}})
	err = session.Run("serverStatus", &result)
	c.Assert(err, IsNil)
	c.Assert(hostPort(result.Host), Equals, "40013")
}

func (s *S) TestGridFSRemove(c *C) {
	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	db := session.DB("mydb")

	gfs := db.GridFS("fs")

	file, err := gfs.Create("myfile.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'1'})
	file.Close()

	file, err = gfs.Create("myfile.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'2'})
	file.Close()

	err = gfs.Remove("myfile.txt")
	c.Assert(err, IsNil)

	_, err = gfs.Open("myfile.txt")
	c.Assert(err == mgo.ErrNotFound, Equals, true)

	n, err := db.C("fs.chunks").Find(nil).Count()
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 0)
}

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) TestDirectToUnknownStateMember(c *C) {
	session, err := mgo.Dial("localhost:40041?connect=direct")
	c.Assert(err, IsNil)
	defer session.Close()

	session.SetMode(mgo.Monotonic, true)

	result := &struct{ Host string }{}
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)
	c.Assert(strings.HasSuffix(result.Host, ":40041"), Equals, true)

	// 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, ":40041"), Equals, true)
}

func (s *S) TestGridFSOpen(c *C) {
	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	db := session.DB("mydb")

	gfs := db.GridFS("fs")

	file, err := gfs.Create("myfile.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'1'})
	file.Close()

	file, err = gfs.Create("myfile.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'2'})
	file.Close()

	file, err = gfs.Open("myfile.txt")
	c.Assert(err, IsNil)
	defer file.Close()

	var b [1]byte

	_, err = file.Read(b[:])
	c.Assert(err, IsNil)
	c.Assert(string(b[:]), Equals, "2")
}

func (s *S) TestGridFSReadChunking(c *C) {
	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	db := session.DB("mydb")

	gfs := db.GridFS("fs")

	file, err := gfs.Create("")
	c.Assert(err, IsNil)

	id := file.Id()

	file.SetChunkSize(5)

	n, err := file.Write([]byte("abcdefghijklmnopqrstuv"))
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 22)

	err = file.Close()
	c.Assert(err, IsNil)

	file, err = gfs.OpenId(id)
	c.Assert(err, IsNil)

	b := make([]byte, 30)

	// Smaller than the chunk size.
	n, err = file.Read(b[:3])
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 3)
	c.Assert(b[:3], DeepEquals, []byte("abc"))

	// Boundary in the middle.
	n, err = file.Read(b[:4])
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 4)
	c.Assert(b[:4], DeepEquals, []byte("defg"))

	// Boundary at the end.
	n, err = file.Read(b[:3])
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 3)
	c.Assert(b[:3], DeepEquals, []byte("hij"))

	// Larger than the chunk size, with 3 chunks.
	n, err = file.Read(b)
	c.Assert(err, IsNil)
	c.Assert(n, Equals, 12)
	c.Assert(b[:12], DeepEquals, []byte("klmnopqrstuv"))

	n, err = file.Read(b)
	c.Assert(n, Equals, 0)
	c.Assert(err == io.EOF, Equals, true)

	err = file.Close()
	c.Assert(err, IsNil)
}

func (s *S) TestGridFSOpenNext(c *C) {
	session, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session.Close()

	db := session.DB("mydb")

	gfs := db.GridFS("fs")

	file, err := gfs.Create("myfile1.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'1'})
	file.Close()

	file, err = gfs.Create("myfile2.txt")
	c.Assert(err, IsNil)
	file.Write([]byte{'2'})
	file.Close()

	var f *mgo.GridFile
	var b [1]byte

	iter := gfs.Find(nil).Sort("-filename").Iter()

	ok := gfs.OpenNext(iter, &f)
	c.Assert(ok, Equals, true)
	c.Check(f.Name(), Equals, "myfile2.txt")

	_, err = f.Read(b[:])
	c.Assert(err, IsNil)
	c.Assert(string(b[:]), Equals, "2")

	ok = gfs.OpenNext(iter, &f)
	c.Assert(ok, Equals, true)
	c.Check(f.Name(), Equals, "myfile1.txt")

	_, err = f.Read(b[:])
	c.Assert(err, IsNil)
	c.Assert(string(b[:]), Equals, "1")

	ok = gfs.OpenNext(iter, &f)
	c.Assert(ok, Equals, false)
	c.Assert(iter.Close(), IsNil)
	c.Assert(f, IsNil)

	// Do it again with a more restrictive query to make sure
	// it's actually taken into account.
	iter = gfs.Find(bson.M{"filename": "myfile1.txt"}).Iter()

	ok = gfs.OpenNext(iter, &f)
	c.Assert(ok, Equals, true)
	c.Check(f.Name(), Equals, "myfile1.txt")

	ok = gfs.OpenNext(iter, &f)
	c.Assert(ok, Equals, false)
	c.Assert(iter.Close(), IsNil)
	c.Assert(f, IsNil)
}

func (s *S) TestSetModeEventualIterBug(c *C) {
	session1, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session1.Close()

	session1.SetMode(mgo.Eventual, false)

	coll1 := session1.DB("mydb").C("mycoll")

	const N = 100
	for i := 0; i < N; i++ {
		err = coll1.Insert(M{"_id": i})
		c.Assert(err, IsNil)
	}

	c.Logf("Waiting until secondary syncs")
	for {
		n, err := coll1.Count()
		c.Assert(err, IsNil)
		if n == N {
			c.Logf("Found all")
			break
		}
	}

	session2, err := mgo.Dial("localhost:40011")
	c.Assert(err, IsNil)
	defer session2.Close()

	session2.SetMode(mgo.Eventual, false)

	coll2 := session2.DB("mydb").C("mycoll")

	i := 0
	iter := coll2.Find(nil).Batch(10).Iter()
	var result struct{}
	for iter.Next(&result) {
		i++
	}
	c.Assert(iter.Close(), Equals, nil)
	c.Assert(i, Equals, N)
}

func (s *S) SetUpSuite(c *C) {
	mgo.SetDebug(true)
	mgo.SetStats(true)
	s.StartAll()

	session, err := mgo.Dial("localhost:40001")
	c.Assert(err, IsNil)
	s.build, err = session.BuildInfo()
	c.Check(err, IsNil)
	session.Close()
}

func getOpCounters(server string) (c *OpCounters, err error) {
	session, err := mgo.Dial(server + "?connect=direct")
	if err != nil {
		return nil, err
	}
	defer session.Close()
	session.SetMode(mgo.Monotonic, true)
	result := struct{ OpCounters }{}
	err = session.Run("serverStatus", &result)
	return &result.OpCounters, err
}

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.Close()
	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) TestPrimaryHiccup(c *C) {
	if *fast {
		c.Skip("-fast")
	}

	session, err := mgo.Dial("localhost:40021")
	c.Assert(err, IsNil)
	defer session.Close()

	// With strong consistency, this will open a socket to the master.
	result := &struct{ Host string }{}
	err = session.Run("serverStatus", result)
	c.Assert(err, IsNil)

	// Establish a few extra sessions to create spare sockets to
	// the master. This increases a bit the chances of getting an
	// incorrect cached socket.
	var sessions []*mgo.Session
	for i := 0; i < 20; i++ {
		sessions = append(sessions, session.Copy())
		err = sessions[len(sessions)-1].Run("serverStatus", result)
		c.Assert(err, IsNil)
	}
	for i := range sessions {
		sessions[i].Close()
	}

	// Kill the master, but bring it back immediatelly.
	host := result.Host
	s.Stop(host)
	s.StartAll()

	// This must fail, since the connection was broken.
	err = session.Run("serverStatus", result)
	c.Assert(err, Equals, io.EOF)

	// With strong consistency, it fails again until reset.
	err = session.Run("serverStatus", result)
	c.Assert(err, Equals, io.EOF)

	session.Refresh()

	// Now we should be able to talk to the new master.
	// Increase the timeout since this may take quite a while.
	session.SetSyncTimeout(3 * time.Minute)

	// Insert some data to confirm it's indeed a master.
	err = session.DB("mydb").C("mycoll").Insert(M{"n": 42})
	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)
}