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cluster_test.go
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cluster_test.go
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// mgo - MongoDB driver for Go
//
// Copyright (c) 2010-2012 - Gustavo Niemeyer <gustavo@niemeyer.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package mgo_test
import (
"fmt"
"io"
"net"
"strings"
"sync"
"time"
. "gopkg.in/check.v1"
"github.com/CardInfoLink/mgo"
"github.com/CardInfoLink/mgo/bson"
)
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) TestCloneSession(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 clone is copying those.
session.SetSafe(nil)
session.SetBatch(-1)
clone := session.Clone()
defer clone.Close()
session.SetSafe(&mgo.Safe{})
// Clone was copied while session was unsafe, so no errors.
cloneColl := clone.DB("mydb").C("mycoll")
err = cloneColl.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 Clone(), same socket is shared between sessions now.
stats := mgo.GetStats()
c.Assert(stats.SocketsInUse, Equals, 1)
c.Assert(stats.SocketRefs, Equals, 2)
// Refreshing one of them should let the original socket go,
// while preserving the safety settings.
clone.Refresh()
err = cloneColl.Insert(M{"_id": 1})
c.Assert(err, IsNil)
// Must have used another connection now.
stats = mgo.GetStats()
c.Assert(stats.SocketsInUse, Equals, 2)
c.Assert(stats.SocketRefs, Equals, 2)
// Ensure query parameters were cloned.
err = cloneColl.Insert(M{"_id": 2})
c.Assert(err, IsNil)
// Ping the database to ensure the nonce has been received already.
c.Assert(clone.Ping(), IsNil)
mgo.ResetStats()
iter := cloneColl.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) TestModeStrong(c *C) {
session, err := mgo.Dial("localhost:40012")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Monotonic, false)
session.SetMode(mgo.Strong, false)
c.Assert(session.Mode(), Equals, mgo.Strong)
result := M{}
cmd := session.DB("admin").C("$cmd")
err = cmd.Find(M{"ismaster": 1}).One(&result)
c.Assert(err, IsNil)
c.Assert(result["ismaster"], Equals, true)
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// Wait since the sync also uses sockets.
for len(session.LiveServers()) != 3 {
c.Log("Waiting for cluster sync to finish...")
time.Sleep(5e8)
}
stats := mgo.GetStats()
c.Assert(stats.MasterConns, Equals, 1)
c.Assert(stats.SlaveConns, Equals, 2)
c.Assert(stats.SocketsInUse, Equals, 1)
session.SetMode(mgo.Strong, true)
stats = mgo.GetStats()
c.Assert(stats.SocketsInUse, Equals, 0)
}
func (s *S) TestModeMonotonic(c *C) {
// Must necessarily connect to a slave, otherwise the
// master connection will be available first.
session, err := mgo.Dial("localhost:40012")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Monotonic, false)
c.Assert(session.Mode(), Equals, mgo.Monotonic)
var result struct{ IsMaster bool }
cmd := session.DB("admin").C("$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)
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, 2)
session.SetMode(mgo.Monotonic, true)
stats = mgo.GetStats()
c.Assert(stats.SocketsInUse, Equals, 0)
}
func (s *S) TestModeMonotonicAfterStrong(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) TestModeStrongAfterMonotonic(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)
}
func (s *S) TestModeMonotonicWriteOnIteration(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)
coll1 := session.DB("mydb").C("mycoll1")
coll2 := session.DB("mydb").C("mycoll2")
ns := []int{40, 41, 42, 43, 44, 45, 46}
for _, n := range ns {
err := coll1.Insert(M{"n": n})
c.Assert(err, IsNil)
}
// Release master so we can grab a slave again.
session.Refresh()
// Wait until synchronization is done.
for {
n, err := coll1.Count()
c.Assert(err, IsNil)
if n == len(ns) {
break
}
}
iter := coll1.Find(nil).Batch(2).Iter()
i := 0
m := M{}
for iter.Next(&m) {
i++
if i > 3 {
err := coll2.Insert(M{"n": 47 + i})
c.Assert(err, IsNil)
}
}
c.Assert(i, Equals, len(ns))
}
func (s *S) TestModeEventual(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.Eventual, false)
c.Assert(session.Mode(), Equals, mgo.Eventual)
result := M{}
err = session.Run("ismaster", &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 = session.Run("ismaster", &result)
c.Assert(err, IsNil)
c.Assert(result["ismaster"], Equals, false)
// 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, 0)
}
func (s *S) TestModeEventualAfterStrong(c *C) {
// Test that a strong session shifting to an eventual
// 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.Eventual, 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 Eventual 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)
session.SetMode(mgo.Eventual, true)
stats = mgo.GetStats()
c.Assert(stats.SocketsInUse, Equals, 0)
}
func (s *S) TestModeStrongFallover(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)
// Kill the master.
host := result.Host
s.Stop(host)
// 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)
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(result.Host, Not(Equals), host)
// 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) TestModePrimaryHiccup(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) TestModeMonotonicFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40021")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Monotonic, true)
// Insert something to force a switch to the master.
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// Wait a bit for this to be synchronized to slaves.
time.Sleep(3 * time.Second)
result := &struct{ Host string }{}
err = session.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 = session.Run("serverStatus", result)
c.Assert(err, Equals, io.EOF)
// With monotonic 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.
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(result.Host, Not(Equals), host)
}
func (s *S) TestModeMonotonicWithSlaveFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40021")
c.Assert(err, IsNil)
defer session.Close()
ssresult := &struct{ Host string }{}
imresult := &struct{ IsMaster bool }{}
// Figure the master while still using the strong session.
err = session.Run("serverStatus", ssresult)
c.Assert(err, IsNil)
err = session.Run("isMaster", imresult)
c.Assert(err, IsNil)
master := ssresult.Host
c.Assert(imresult.IsMaster, Equals, true, Commentf("%s is not the master", master))
// Create new monotonic session with an explicit address to ensure
// a slave is synchronized before the master, otherwise a connection
// with the master may be used below for lack of other options.
var addr string
switch {
case strings.HasSuffix(ssresult.Host, ":40021"):
addr = "localhost:40022"
case strings.HasSuffix(ssresult.Host, ":40022"):
addr = "localhost:40021"
case strings.HasSuffix(ssresult.Host, ":40023"):
addr = "localhost:40021"
default:
c.Fatal("Unknown host: ", ssresult.Host)
}
session, err = mgo.Dial(addr)
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Monotonic, true)
// Check the address of the socket associated with the monotonic session.
c.Log("Running serverStatus and isMaster with monotonic session")
err = session.Run("serverStatus", ssresult)
c.Assert(err, IsNil)
err = session.Run("isMaster", imresult)
c.Assert(err, IsNil)
slave := ssresult.Host
c.Assert(imresult.IsMaster, Equals, false, Commentf("%s is not a slave", slave))
c.Assert(master, Not(Equals), slave)
// Kill the master.
s.Stop(master)
// Session must still be good, since we were talking to a slave.
err = session.Run("serverStatus", ssresult)
c.Assert(err, IsNil)
c.Assert(ssresult.Host, Equals, slave,
Commentf("Monotonic session moved from %s to %s", slave, ssresult.Host))
// If we try to insert something, it'll have to hold until the new
// master is available to move the connection, and work correctly.
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// Must now be talking to the new master.
err = session.Run("serverStatus", ssresult)
c.Assert(err, IsNil)
err = session.Run("isMaster", imresult)
c.Assert(err, IsNil)
c.Assert(imresult.IsMaster, Equals, true, Commentf("%s is not the master", master))
// ... which is not the old one, since it's still dead.
c.Assert(ssresult.Host, Not(Equals), master)
}
func (s *S) TestModeEventualFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40021")
c.Assert(err, IsNil)
defer session.Close()
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
master := result.Host
session.SetMode(mgo.Eventual, true)
// Should connect to the master when needed.
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// Wait a bit for this to be synchronized to slaves.
time.Sleep(3 * time.Second)
// Kill the master.
s.Stop(master)
// Should still work, with the new master now.
coll = session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(result.Host, Not(Equals), master)
}
func (s *S) TestModeSecondaryJustPrimary(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40001")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Secondary, true)
err = session.Ping()
c.Assert(err, ErrorMatches, "no reachable servers")
}
func (s *S) TestModeSecondaryPreferredJustPrimary(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40001")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.SecondaryPreferred, true)
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
}
func (s *S) TestModeSecondaryPreferredFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40011")
c.Assert(err, IsNil)
defer session.Close()
// Ensure secondaries are available for being picked up.
for len(session.LiveServers()) != 3 {
c.Log("Waiting for cluster sync to finish...")
time.Sleep(5e8)
}
session.SetMode(mgo.SecondaryPreferred, true)
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Not(Equals), "rs1a")
secondary := result.Host
// Should connect to the primary when needed.
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// Wait a bit for this to be synchronized to slaves.
time.Sleep(3 * time.Second)
// Kill the primary.
s.Stop("localhost:40011")
// It can still talk to the selected secondary.
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(result.Host, Equals, secondary)
// But cannot speak to the primary until reset.
coll = session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, Equals, io.EOF)
session.Refresh()
// Can still talk to a secondary.
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Not(Equals), "rs1a")
s.StartAll()
// Should now be able to talk to the primary again.
coll = session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
}
func (s *S) TestModePrimaryPreferredFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40011")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.PrimaryPreferred, true)
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Equals, "rs1a")
// Kill the primary.
s.Stop("localhost:40011")
// Should now fail as there was a primary socket in use already.
err = session.Run("serverStatus", result)
c.Assert(err, Equals, io.EOF)
// Refresh so the reserved primary socket goes away.
session.Refresh()
// Should be able to talk to the secondary.
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
s.StartAll()
// Should wait for the new primary to become available.
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
// And should use the new primary in general, as it is preferred.
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Equals, "rs1a")
}
func (s *S) TestModePrimaryFallover(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40011")
c.Assert(err, IsNil)
defer session.Close()
session.SetSyncTimeout(3 * time.Second)
session.SetMode(mgo.Primary, true)
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Equals, "rs1a")
// Kill the primary.
s.Stop("localhost:40011")
session.Refresh()
err = session.Ping()
c.Assert(err, ErrorMatches, "no reachable servers")
}
func (s *S) TestModeSecondary(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40011")
c.Assert(err, IsNil)
defer session.Close()
session.SetMode(mgo.Secondary, true)
result := &struct{ Host string }{}
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(supvName(result.Host), Not(Equals), "rs1a")
secondary := result.Host
coll := session.DB("mydb").C("mycoll")
err = coll.Insert(M{"a": 1})
c.Assert(err, IsNil)
err = session.Run("serverStatus", result)
c.Assert(err, IsNil)
c.Assert(result.Host, Equals, secondary)
}
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.SocketsAlive != 3 {
c.Logf("Waiting for all connections to be established (sockets alive currently %d)...", stats.SocketsAlive)
stats = mgo.GetStats()
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.
startedAll := make(chan bool)
go func() {
time.Sleep(5e9)
s.StartAll()
startedAll <- true
}()
// Do not allow the test to return before the goroutine above is done.
defer func() {
<-startedAll
}()
// 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)
}
// 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) 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) TestSyncTimeout(c *C) {
if *fast {
c.Skip("-fast")
}
session, err := mgo.Dial("localhost:40001")
c.Assert(err, IsNil)
defer session.Close()
s.Stop("localhost:40001")
timeout := 3 * time.Second
session.SetSyncTimeout(timeout)
started := time.Now()
// Do something.
result := struct{ Ok bool }{}