PT-1706 Made mongo tools compile with Go 1.12

- Removed t.parallel from tests
- Added lock to stats  pkg
- Fixed timeout channels usage in stats pkg
- Removed non-compatible dependency (badfix/slice) and its dependencies
- Made code improvements for linter

Gopkg.lock

@@ -2,138 +2,179 @@
 
 
 [[projects]]
+  digest = "1:b856d8248663c39265a764561c1a1a149783f6cc815feb54a1f3a591b91f6eca"
   name = "github.com/Masterminds/semver"
   packages = ["."]
+  pruneopts = ""
   revision = "c7af12943936e8c39859482e61f0574c2fd7fc75"
   version = "v1.4.2"
 
 [[projects]]
+  digest = "1:f82b8ac36058904227087141017bb82f4b0fc58272990a4cdae3e2d6d222644e"
   name = "github.com/StackExchange/wmi"
   packages = ["."]
+  pruneopts = ""
   revision = "5d049714c4a64225c3c79a7cf7d02f7fb5b96338"
   version = "1.0.0"
 
 [[projects]]
+  digest = "1:15d017551627c8bb091bde628215b2861bed128855343fdd570c62d08871f6e1"
   name = "github.com/alecthomas/kingpin"
   packages = ["."]
+  pruneopts = ""
   revision = "947dcec5ba9c011838740e680966fd7087a71d0d"
   version = "v2.2.6"
 
 [[projects]]
   branch = "master"
+  digest = "1:a74730e052a45a3fab1d310fdef2ec17ae3d6af16228421e238320846f2aaec8"
   name = "github.com/alecthomas/template"
   packages = [
     ".",
-    "parse"
+    "parse",
   ]
+  pruneopts = ""
   revision = "a0175ee3bccc567396460bf5acd36800cb10c49c"
 
 [[projects]]
   branch = "master"
+  digest = "1:8483994d21404c8a1d489f6be756e25bfccd3b45d65821f25695577791a08e68"
   name = "github.com/alecthomas/units"
   packages = ["."]
+  pruneopts = ""
   revision = "2efee857e7cfd4f3d0138cc3cbb1b4966962b93a"
 
 [[projects]]
-  branch = "master"
+  digest = "1:03edf882162b807cdf1bc558c66226167fa2f8eb44359eac2eeb3794a91cb168"
-  name = "github.com/bradfitz/slice"
-  packages = ["."]
-  revision = "d9036e2120b5ddfa53f3ebccd618c4af275f47da"
-
-[[projects]]
   name = "github.com/go-ini/ini"
   packages = ["."]
-  revision = "ace140f73450505f33e8b8418216792275ae82a7"
+  pruneopts = ""
-  version = "v1.35.0"
+  revision = "c85607071cf08ca1adaf48319cd1aa322e81d8c1"
+  version = "v1.42.0"
 
 [[projects]]
+  digest = "1:b6581f9180e0f2d5549280d71819ab951db9d511478c87daca95669589d505c0"
   name = "github.com/go-ole/go-ole"
   packages = [
     ".",
-    "oleutil"
+    "oleutil",
   ]
-  revision = "a41e3c4b706f6ae8dfbff342b06e40fa4d2d0506"
+  pruneopts = ""
-  version = "v1.2.1"
+  revision = "97b6244175ae18ea6eef668034fd6565847501c9"
+  version = "v1.2.4"
 
 [[projects]]
+  digest = "1:530233672f656641b365f8efb38ed9fba80e420baff2ce87633813ab3755ed6d"
   name = "github.com/golang/mock"
   packages = ["gomock"]
-  revision = "c34cdb4725f4c3844d095133c6e40e448b86589b"
+  pruneopts = ""
-  version = "v1.1.1"
+  revision = "51421b967af1f557f93a59e0057aaf15ca02e29c"
+  version = "v1.2.0"
 
 [[projects]]
   branch = "master"
+  digest = "1:b759103c9b4135568253c17d2866064cde398e93764b611caabf5aa8e3059685"
   name = "github.com/hashicorp/go-version"
   packages = ["."]
-  revision = "23480c0665776210b5fbbac6eaaee40e3e6a96b7"
+  pruneopts = ""
+  revision = "d40cf49b3a77bba84a7afdbd7f1dc295d114efb1"
 
 [[projects]]
   branch = "master"
+  digest = "1:f81c8d7354cc0c6340f2f7a48724ee6c2b3db3e918ecd441c985b4d2d97dd3e7"
   name = "github.com/howeyc/gopass"
   packages = ["."]
+  pruneopts = ""
   revision = "bf9dde6d0d2c004a008c27aaee91170c786f6db8"
 
 [[projects]]
+  digest = "1:0f51cee70b0d254dbc93c22666ea2abf211af81c1701a96d04e2284b408621db"
+  name = "github.com/konsorten/go-windows-terminal-sequences"
+  packages = ["."]
+  pruneopts = ""
+  revision = "f55edac94c9bbba5d6182a4be46d86a2c9b5b50e"
+  version = "v1.0.2"
+
+[[projects]]
+  digest = "1:3108ec0946181c60040ff51b811908f89d03e521e2b4ade5ef5c65b3c0e911ae"
   name = "github.com/kr/pretty"
   packages = ["."]
+  pruneopts = ""
   revision = "73f6ac0b30a98e433b289500d779f50c1a6f0712"
   version = "v0.1.0"
 
 [[projects]]
+  digest = "1:11b056b4421396ab14e384ab8ab8c2079b03f1e51aa5eb4d9b81f9e0d1aa8fbf"
   name = "github.com/kr/text"
   packages = ["."]
+  pruneopts = ""
   revision = "e2ffdb16a802fe2bb95e2e35ff34f0e53aeef34f"
   version = "v0.1.0"
 
 [[projects]]
+  digest = "1:0093a7c66d5b9e0cdaf4be5c20e0a9b889d1d839148eeed1d587e99b4cfd90ff"
   name = "github.com/mattn/go-shellwords"
   packages = ["."]
-  revision = "02e3cf038dcea8290e44424da473dd12be796a8a"
+  pruneopts = ""
-  version = "v1.0.3"
+  revision = "a72fbe27a1b0ed0df2f02754945044ce1456608b"
+  version = "v1.0.5"
 
 [[projects]]
+  digest = "1:a067513044dc491395a58f56f39cedddb5ad35789b832b570c283a64d712f81b"
   name = "github.com/montanaflynn/stats"
   packages = ["."]
+  pruneopts = ""
   revision = "eeaced052adbcfeea372c749c281099ed7fdaa38"
   version = "0.2.0"
 
 [[projects]]
   branch = "master"
+  digest = "1:020f67c818cb9c3fdc77d92c5744fb2d5b90930280cc43311ba43c6459fd0b98"
   name = "github.com/pborman/getopt"
   packages = [
     ".",
-    "v2"
+    "v2",
   ]
-  revision = "7148bc3a4c3008adfcab60cbebfd0576018f330b"
+  pruneopts = ""
+  revision = "fd6d657c3083960b8d604310c34a621ec24bdc6a"
 
 [[projects]]
   branch = "master"
+  digest = "1:7a840dbacabd648e5b511010dea5da9eed99030dd185b3c7c7195fdadb3051a8"
   name = "github.com/percona/go-mysql"
   packages = ["query"]
-  revision = "82ed67a1d0f1779cd60a025c54e0827da0c0838b"
+  pruneopts = ""
+  revision = "f5cfaf6a5e55b754b7b106f4488e1bc24cb8c2d6"
 
 [[projects]]
+  digest = "1:16b4510ba61ab0bb7a4e694ea6396a7b2879f5fabb21e93066e182691f790173"
   name = "github.com/percona/pmgo"
   packages = [
     ".",
-    "pmgomock"
+    "pmgomock",
   ]
+  pruneopts = ""
   revision = "497d06e28f910fbe26d5d60f59d36284a6901c6f"
   version = "0.5.2"
 
 [[projects]]
+  digest = "1:1d7e1867c49a6dd9856598ef7c3123604ea3daabf5b83f303ff457bcbc410b1d"
   name = "github.com/pkg/errors"
   packages = ["."]
-  revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
+  pruneopts = ""
-  version = "v0.8.0"
+  revision = "ba968bfe8b2f7e042a574c888954fccecfa385b4"
+  version = "v0.8.1"
 
 [[projects]]
+  digest = "1:7f569d906bdd20d906b606415b7d794f798f91a62fcfb6a4daa6d50690fb7a3f"
   name = "github.com/satori/go.uuid"
   packages = ["."]
+  pruneopts = ""
   revision = "f58768cc1a7a7e77a3bd49e98cdd21419399b6a3"
   version = "v1.2.0"
 
 [[projects]]
+  digest = "1:d77a85cf43b70ae61fa2543d402d782b40dca0f5f41413839b5f916782b0fab9"
   name = "github.com/shirou/gopsutil"
   packages = [
     "cpu",
@@ -141,52 +182,58 @@
     "internal/common",
     "mem",
     "net",
-    "process"
+    "process",
   ]
-  revision = "fc04d2dd9a512906a2604242b35275179e250eda"
+  pruneopts = ""
-  version = "v2.18.03"
+  revision = "6c6abd6d1666d6b27f1c261e0f850441ba22aa3a"
+  version = "v2.19.02"
 
 [[projects]]
   branch = "master"
+  digest = "1:99c6a6dab47067c9b898e8c8b13d130c6ab4ffbcc4b7cc6236c2cd0b1e344f5b"
   name = "github.com/shirou/w32"
   packages = ["."]
+  pruneopts = ""
   revision = "bb4de0191aa41b5507caa14b0650cdbddcd9280b"
 
 [[projects]]
+  digest = "1:b73fe282e350b3ef2c71d8ff08e929e0b9670b1bb5b7fde1d3c1b4cd6e6dc8b1"
   name = "github.com/sirupsen/logrus"
   packages = ["."]
-  revision = "d682213848ed68c0a260ca37d6dd5ace8423f5ba"
+  pruneopts = ""
-  version = "v1.0.4"
+  revision = "dae0fa8d5b0c810a8ab733fbd5510c7cae84eca4"
-
+  version = "v1.4.0"
-[[projects]]
-  branch = "master"
-  name = "go4.org"
-  packages = ["reflectutil"]
-  revision = "9599cf28b011184741f249bd9f9330756b506cbc"
 
 [[projects]]
   branch = "master"
+  digest = "1:36ef1d8645934b1744cc7d8726e00d3dd9d8d84c18617bf7367a3a6d532f3370"
   name = "golang.org/x/crypto"
   packages = ["ssh/terminal"]
-  revision = "d6449816ce06963d9d136eee5a56fca5b0616e7e"
+  pruneopts = ""
+  revision = "a5d413f7728c81fb97d96a2b722368945f651e78"
 
 [[projects]]
   branch = "master"
+  digest = "1:adcb9e84ce154ef1d45851b57c40f8a211db3e36373a65b7c4f10c79b7428718"
   name = "golang.org/x/net"
   packages = ["context"]
-  revision = "d41e8174641f662c5a2d1c7a5f9e828788eb8706"
+  pruneopts = ""
+  revision = "74de082e2cca95839e88aa0aeee5aadf6ce7710f"
 
 [[projects]]
   branch = "master"
+  digest = "1:1b0de777d8ddd63356d5a4d76799ea8f47e811aa9dda85ddc72b2a061c799cc9"
   name = "golang.org/x/sys"
   packages = [
     "unix",
-    "windows"
+    "windows",
   ]
-  revision = "3ccc7e5779793fd54564baf60c51bf017955e0ba"
+  pruneopts = ""
+  revision = "9eb1bfa1ce65ae8a6ff3114b0aaf9a41a6cf3560"
 
 [[projects]]
   branch = "v2"
+  digest = "1:f54ba71a035aac92ced3e902d2bff3734a15d1891daff73ec0f90ef236750139"
   name = "gopkg.in/mgo.v2"
   packages = [
     ".",
@@ -194,19 +241,45 @@
     "dbtest",
     "internal/json",
     "internal/sasl",
-    "internal/scram"
+    "internal/scram",
   ]
-  revision = "3f83fa5005286a7fe593b055f0d7771a7dce4655"
+  pruneopts = ""
+  revision = "9856a29383ce1c59f308dd1cf0363a79b5bef6b5"
 
 [[projects]]
   branch = "v2"
+  digest = "1:61a650a53e5e865a91ae9581f02990a4b6e3afcb8d280f19b1e67a3c284944e6"
   name = "gopkg.in/tomb.v2"
   packages = ["."]
+  pruneopts = ""
   revision = "d5d1b5820637886def9eef33e03a27a9f166942c"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "35a93d0003438bc707c085101ccfca910f349d201cd01edc986d0ed64ef2a12f"
+  input-imports = [
+    "github.com/Masterminds/semver",
+    "github.com/alecthomas/kingpin",
+    "github.com/go-ini/ini",
+    "github.com/golang/mock/gomock",
+    "github.com/hashicorp/go-version",
+    "github.com/howeyc/gopass",
+    "github.com/kr/pretty",
+    "github.com/mattn/go-shellwords",
+    "github.com/montanaflynn/stats",
+    "github.com/pborman/getopt",
+    "github.com/pborman/getopt/v2",
+    "github.com/percona/go-mysql/query",
+    "github.com/percona/pmgo",
+    "github.com/percona/pmgo/pmgomock",
+    "github.com/pkg/errors",
+    "github.com/satori/go.uuid",
+    "github.com/shirou/gopsutil/process",
+    "github.com/sirupsen/logrus",
+    "golang.org/x/crypto/ssh/terminal",
+    "gopkg.in/mgo.v2",
+    "gopkg.in/mgo.v2/bson",
+    "gopkg.in/mgo.v2/dbtest",
+  ]
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -24,10 +24,6 @@
   name = "github.com/Masterminds/semver"
   version = "1.4.0"
 
-[[constraint]]
-  branch = "master"
-  name = "github.com/bradfitz/slice"
-
 [[constraint]]
   name = "github.com/golang/mock"
   version = "1.0.0"

src/go/lib/tutil/util.go

@@ -52,6 +52,7 @@ func LoadBson(filename string, destination interface{}) error {
 	if err != nil {
 		return err
 	}
+	defer file.Close()
 
 	buf, err := ioutil.ReadAll(file)
 	if err != nil {

src/go/mongolib/profiler/profiler.go

@@ -57,7 +57,7 @@ func NewProfiler(iterator pmgo.IterManager, filters []filter.Filter, ticker <-ch
 
 		// internal
 		docsChan:     make(chan proto.SystemProfile, DocsBufferSize),
-		timeoutsChan: nil,
+		timeoutsChan: make(chan time.Time),
 		keyFilters:   []string{"^shardVersion$", "^\\$"},
 	}
 }
@@ -97,9 +97,6 @@ func (p *Profile) Stop() {
 func (p *Profile) TimeoutsChan() <-chan time.Time {
 	p.lock.Lock()
 	defer p.lock.Unlock()
-	if p.timeoutsChan == nil {
-		p.timeoutsChan = make(chan time.Time)
-	}
 	return p.timeoutsChan
 }
 
@@ -129,14 +126,15 @@ func (p *Profile) getDocs() {
 
 	for p.iterator.Next(&doc) || p.iterator.Timeout() {
 		if p.iterator.Timeout() {
-			if p.timeoutsChan != nil {
+			select {
-				p.timeoutsChan <- time.Now().UTC()
+			case p.timeoutsChan <- time.Now().UTC():
+			default:
 			}
 			continue
 		}
 		valid := true
 		for _, filter := range p.filters {
-			if filter(doc) == false {
+			if !filter(doc) {
 				valid = false
 				break
 			}

src/go/mongolib/stats/stats.go

@@ -91,6 +91,7 @@ func (s *Stats) Add(doc proto.SystemProfile) error {
 	qiac.Count++
 	// docsExamined is renamed from nscannedObjects in 3.2.0.
 	// https://docs.mongodb.com/manual/reference/database-profiler/#system.profile.docsExamined
+	s.Lock()
 	if doc.NscannedObjects > 0 {
 		qiac.NScanned = append(qiac.NScanned, float64(doc.NscannedObjects))
 	} else {
@@ -105,14 +106,15 @@ func (s *Stats) Add(doc proto.SystemProfile) error {
 	if qiac.LastSeen.IsZero() || qiac.LastSeen.Before(doc.Ts) {
 		qiac.LastSeen = doc.Ts
 	}
+	s.Unlock()
 
 	return nil
 }
 
 // Queries returns all collected statistics
 func (s *Stats) Queries() Queries {
-	s.RLock()
+	s.Lock()
-	defer s.RUnlock()
+	defer s.Unlock()
 
 	keys := GroupKeys{}
 	for key := range s.queryInfoAndCounters {

src/go/mongolib/stats/stats_test.go

@@ -188,8 +188,6 @@ func TestStatsSingle(t *testing.T) {
 	for _, file := range files {
 		f := file.Name()
 		t.Run(f, func(t *testing.T) {
-			t.Parallel()
-
 			doc := proto.SystemProfile{}
 			err = tutil.LoadBson(dir+f, &doc)
 			if err != nil {

src/go/mongolib/util/util.go

@@ -1,10 +1,10 @@
 package util
 
 import (
+	"sort"
 	"strings"
 	"time"
 
-	"github.com/bradfitz/slice"
 	"github.com/percona/percona-toolkit/src/go/mongolib/proto"
 	"github.com/percona/pmgo"
 	"github.com/pkg/errors"
@@ -58,9 +58,7 @@ func GetReplicasetMembers(dialer pmgo.Dialer, di *pmgo.DialInfo) ([]proto.Member
 			if serverStatus, err := GetServerStatus(dialer, di, m.Name); err == nil {
 				m.ID = serverStatus.Pid
 				m.StorageEngine = serverStatus.StorageEngine
-				if cmdOpts.Parsed.Sharding.ClusterRole == "" {
+				if cmdOpts.Parsed.Sharding.ClusterRole != "" {
-					m.StateStr = m.StateStr
-				} else {
 					m.StateStr = cmdOpts.Parsed.Sharding.ClusterRole + "/" + m.StateStr
 				}
 				m.StateStr = strings.ToUpper(m.StateStr)
@@ -75,7 +73,7 @@ func GetReplicasetMembers(dialer pmgo.Dialer, di *pmgo.DialInfo) ([]proto.Member
 		members = append(members, member)
 	}
 
-	slice.Sort(members, func(i, j int) bool { return members[i].Name < members[j].Name })
+	sort.Slice(members, func(i, j int) bool { return members[i].Name < members[j].Name })
 	return members, nil
 }
 
@@ -145,13 +143,13 @@ func buildHostsListFromShardMap(shardsMap proto.ShardsMap) []string {
 	/* Example
 	mongos> db.getSiblingDB('admin').runCommand('getShardMap')
 	{
-	        "map" : {
+	  "map" : {
-	                "config" : "localhost:19001,localhost:19002,localhost:19003",
+	    "config" : "localhost:19001,localhost:19002,localhost:19003",
-	                "localhost:17001" : "r1/localhost:17001,localhost:17002,localhost:17003",
+	    "localhost:17001" : "r1/localhost:17001,localhost:17002,localhost:17003",
-	                "r1" : "r1/localhost:17001,localhost:17002,localhost:17003",
+	    "r1" : "r1/localhost:17001,localhost:17002,localhost:17003",
-	                "r1/localhost:17001,localhost:17002,localhost:17003" : "r1/localhost:17001,localhost:17002,localhost:17003",
+	    "r1/localhost:17001,localhost:17002,localhost:17003" : "r1/localhost:17001,localhost:17002,localhost:17003",
-	        },
+	  },
-	        "ok" : 1
+	  "ok" : 1
 	}
 	*/
 
@@ -200,12 +198,10 @@ func GetShardedHosts(dialer pmgo.Dialer, di *pmgo.DialInfo) ([]string, error) {
 		return hostnames, errors.Wrap(err, "cannot list shards")
 	}
 
-	if shardsInfo != nil {
+	for _, shardInfo := range shardsInfo.Shards {
-		for _, shardInfo := range shardsInfo.Shards {
+		m := strings.Split(shardInfo.Host, "/")
-			m := strings.Split(shardInfo.Host, "/")
+		h := strings.Split(m[1], ",")
-			h := strings.Split(m[1], ",")
+		hostnames = append(hostnames, h[0])
-			hostnames = append(hostnames, h[0])
-		}
 	}
 	return hostnames, nil
 }
@@ -230,7 +226,11 @@ func GetServerStatus(dialer pmgo.Dialer, di *pmgo.DialInfo, hostname string) (pr
 	defer session.Close()
 	session.SetMode(mgo.Monotonic, true)
 
-	if err := session.DB("admin").Run(bson.D{{"serverStatus", 1}, {"recordStats", 1}}, &ss); err != nil {
+	query := bson.D{
+		{Name: "serverStatus", Value: 1},
+		{Name: "recordStats", Value: 1},
+	}
+	if err := session.DB("admin").Run(query, &ss); err != nil {
 		return ss, errors.Wrap(err, "GetHostInfo.serverStatus")
 	}
 

src/go/pt-mongodb-summary/main.go

@@ -30,12 +30,13 @@ import (
 const (
 	TOOLNAME = "pt-mongodb-summary"
 
-	DEFAULT_AUTHDB             = "admin"
+	DefaultAuthDB             = "admin"
-	DEFAULT_HOST               = "localhost:27017"
+	DefaultHost               = "localhost:27017"
-	DEFAULT_LOGLEVEL           = "warn"
+	DefaultLogLevel           = "warn"
-	DEFAULT_RUNNINGOPSINTERVAL = 1000 // milliseconds
+	DefaultRunningOpsInterval = 1000 // milliseconds
-	DEFAULT_RUNNINGOPSSAMPLES  = 5
+	DefaultRunningOpsSamples  = 5
-	DEFAULT_OUTPUT_FORMAT      = "text"
+	DefaultOutputFormat       = "text"
+	typeMongos                = "mongos"
 )
 
 var (
@@ -99,10 +100,10 @@ type security struct {
 
 type databases struct {
 	Databases []struct {
-		Name       string           `bson:"name"`
+		Name string `bson:"name"`
-		SizeOnDisk int64            `bson:"sizeOnDisk"`
+		// SizeOnDisk int64            `bson:"sizeOnDisk"`
-		Empty      bool             `bson:"empty"`
+		// Empty      bool             `bson:"empty"`
-		Shards     map[string]int64 `bson:"shards"`
+		// Shards     map[string]int64 `bson:"shards"`
 	} `bson:"databases"`
 	TotalSize   int64 `bson:"totalSize"`
 	TotalSizeMb int64 `bson:"totalSizeMb"`
@@ -227,7 +228,7 @@ func main() {
 
 	ci := &collectedInfo{}
 
-	ci.HostInfo, err = GetHostinfo(session)
+	ci.HostInfo, err = getHostinfo(session)
 	if err != nil {
 		message := fmt.Sprintf("Cannot get host info for %q: %s", di.Addrs[0], err.Error())
 		log.Errorf(message)
@@ -241,13 +242,18 @@ func main() {
 	log.Debugf("replicaMembers:\n%+v\n", ci.ReplicaMembers)
 
 	if opts.RunningOpsSamples > 0 && opts.RunningOpsInterval > 0 {
-		if ci.RunningOps, err = GetOpCountersStats(session, opts.RunningOpsSamples, time.Duration(opts.RunningOpsInterval)*time.Millisecond); err != nil {
+		ci.RunningOps, err = getOpCountersStats(
+			session,
+			opts.RunningOpsSamples,
+			time.Duration(opts.RunningOpsInterval)*time.Millisecond,
+		)
+		if err != nil {
 			log.Printf("[Error] cannot get Opcounters stats: %v\n", err)
 		}
 	}
 
 	if ci.HostInfo != nil {
-		if ci.SecuritySettings, err = GetSecuritySettings(session, ci.HostInfo.Version); err != nil {
+		if ci.SecuritySettings, err = getSecuritySettings(session, ci.HostInfo.Version); err != nil {
 			log.Errorf("[Error] cannot get security settings: %v\n", err)
 		}
 	} else {
@@ -255,7 +261,7 @@ func main() {
 	}
 
 	if ci.OplogInfo, err = oplog.GetOplogInfo(hostnames, di); err != nil {
-		log.Info("Cannot get Oplog info: %v\n", err)
+		log.Infof("Cannot get Oplog info: %s\n", err)
 	} else {
 		if len(ci.OplogInfo) == 0 {
 			log.Info("oplog info is empty. Skipping")
@@ -265,13 +271,13 @@ func main() {
 	}
 
 	// individual servers won't know about this info
-	if ci.HostInfo.NodeType == "mongos" {
+	if ci.HostInfo.NodeType == typeMongos {
-		if ci.ClusterWideInfo, err = GetClusterwideInfo(session); err != nil {
+		if ci.ClusterWideInfo, err = getClusterwideInfo(session); err != nil {
 			log.Printf("[Error] cannot get cluster wide info: %v\n", err)
 		}
 	}
 
-	if ci.HostInfo.NodeType == "mongos" {
+	if ci.HostInfo.NodeType == typeMongos {
 		if ci.BalancerStats, err = GetBalancerStats(session); err != nil {
 			log.Printf("[Error] cannot get balancer stats: %v\n", err)
 		}
@@ -326,7 +332,7 @@ func formatResults(ci *collectedInfo, format string) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
-func GetHostinfo(session pmgo.SessionManager) (*hostInfo, error) {
+func getHostinfo(session pmgo.SessionManager) (*hostInfo, error) {
 
 	hi := proto.HostInfo{}
 	if err := session.Run(bson.M{"hostInfo": 1}, &hi); err != nil {
@@ -357,7 +363,7 @@ func GetHostinfo(session pmgo.SessionManager) (*hostInfo, error) {
 		Hostname:          hi.System.Hostname,
 		HostOsType:        hi.Os.Type,
 		HostSystemCPUArch: hi.System.CpuArch,
-		DBPath:            "", // Sets default. It will be overriden later if necessary
+		DBPath:            "", // Sets default. It will be overridden later if necessary
 
 		ProcessName:      ss.Process,
 		ProcProcessCount: procCount,
@@ -390,19 +396,19 @@ func countMongodProcesses() (int, error) {
 		if err != nil {
 			continue
 		}
-		if name, _ := p.Name(); name == "mongod" || name == "mongos" {
+		if name, _ := p.Name(); name == "mongod" || name == typeMongos {
 			count++
 		}
 	}
 	return count, nil
 }
 
-func GetClusterwideInfo(session pmgo.SessionManager) (*clusterwideInfo, error) {
+func getClusterwideInfo(session pmgo.SessionManager) (*clusterwideInfo, error) {
 	var databases databases
 
 	err := session.Run(bson.M{"listDatabases": 1}, &databases)
 	if err != nil {
-		return nil, errors.Wrap(err, "GetClusterwideInfo.listDatabases ")
+		return nil, errors.Wrap(err, "getClusterwideInfo.listDatabases ")
 	}
 
 	cwi := &clusterwideInfo{
@@ -456,7 +462,7 @@ func sizeAndUnit(size int64) (float64, string) {
 	return newSize, unit[idx]
 }
 
-func GetSecuritySettings(session pmgo.SessionManager, ver string) (*security, error) {
+func getSecuritySettings(session pmgo.SessionManager, ver string) (*security, error) {
 	s := security{
 		Auth: "disabled",
 		SSL:  "disabled",
@@ -498,13 +504,22 @@ func GetSecuritySettings(session pmgo.SessionManager, ver string) (*security, er
 			isPrivate, err := isPrivateNetwork(strings.TrimSpace(ip))
 			if !isPrivate && err == nil {
 				if s.Auth == "enabled" {
-					s.WarningMsgs = append(s.WarningMsgs, fmt.Sprintf("Warning: You might be insecure (bind ip %s is public)", ip))
+					s.WarningMsgs = append(
+						s.WarningMsgs,
+						fmt.Sprintf("Warning: You might be insecure (bind ip %s is public)", ip),
+					)
 				} else {
-					s.WarningMsgs = append(s.WarningMsgs, fmt.Sprintf("Error. You are insecure: bind ip %s is public and auth is disabled", ip))
+					s.WarningMsgs = append(
+						s.WarningMsgs,
+						fmt.Sprintf("Error. You are insecure: bind ip %s is public and auth is disabled", ip),
+					)
 				}
 			} else {
 				if ip != "127.0.0.1" && ip != extIP {
-					s.WarningMsgs = append(s.WarningMsgs, fmt.Sprintf("WARNING: You might be insecure. IP binding %s is not localhost", ip))
+					s.WarningMsgs = append(
+						s.WarningMsgs,
+						fmt.Sprintf("WARNING: You might be insecure. IP binding %s is not localhost", ip),
+					)
 				}
 			}
 		}
@@ -553,12 +568,12 @@ func getNodeType(session pmgo.SessionManager) (string, error) {
 	} else if md.Msg == "isdbgrid" {
 		// isdbgrid is always the msg value when calling isMaster on a mongos
 		// see http://docs.mongodb.org/manual/core/sharded-cluster-query-router/
-		return "mongos", nil
+		return typeMongos, nil
 	}
 	return "mongod", nil
 }
 
-func GetOpCountersStats(session pmgo.SessionManager, count int, sleep time.Duration) (*opCounters, error) {
+func getOpCountersStats(session pmgo.SessionManager, count int, sleep time.Duration) (*opCounters, error) {
 	oc := &opCounters{}
 	prevOpCount := &opCounters{}
 	ss := proto.ServerStatus{}
@@ -694,7 +709,7 @@ func getProcInfo(pid int32, templateData *procInfo) error {
 	//proc, err := process.NewProcess(templateData.ServerStatus.Pid)
 	proc, err := process.NewProcess(pid)
 	if err != nil {
-		return fmt.Errorf("cannot get process %d\n", pid)
+		return fmt.Errorf("cannot get process %d", pid)
 	}
 	ct, err := proc.CreateTime()
 	if err != nil {
@@ -850,12 +865,12 @@ func externalIP() (string, error) {
 
 func parseFlags() (*options, error) {
 	opts := &options{
-		Host:               DEFAULT_HOST,
+		Host:               DefaultHost,
-		LogLevel:           DEFAULT_LOGLEVEL,
+		LogLevel:           DefaultLogLevel,
-		RunningOpsSamples:  DEFAULT_RUNNINGOPSSAMPLES,
+		RunningOpsSamples:  DefaultRunningOpsSamples,
-		RunningOpsInterval: DEFAULT_RUNNINGOPSINTERVAL, // milliseconds
+		RunningOpsInterval: DefaultRunningOpsInterval, // milliseconds
-		AuthDB:             DEFAULT_AUTHDB,
+		AuthDB:             DefaultAuthDB,
-		OutputFormat:       DEFAULT_OUTPUT_FORMAT,
+		OutputFormat:       DefaultOutputFormat,
 	}
 
 	gop := getopt.New()
@@ -864,17 +879,22 @@ func parseFlags() (*options, error) {
 	gop.BoolVarLong(&opts.NoVersionCheck, "no-version-check", 'c', "", "Default: Don't check for updates")
 
 	gop.StringVarLong(&opts.User, "username", 'u', "", "Username to use for optional MongoDB authentication")
-	gop.StringVarLong(&opts.Password, "password", 'p', "", "Password to use for optional MongoDB authentication").SetOptional()
+	gop.StringVarLong(&opts.Password, "password", 'p', "", "Password to use for optional MongoDB authentication").
+		SetOptional()
 	gop.StringVarLong(&opts.AuthDB, "authenticationDatabase", 'a', "admin",
 		"Database to use for optional MongoDB authentication. Default: admin")
-	gop.StringVarLong(&opts.LogLevel, "log-level", 'l', "error", "Log level: panic, fatal, error, warn, info, debug. Default: error")
+	gop.StringVarLong(&opts.LogLevel, "log-level", 'l', "error",
+		"Log level: panic, fatal, error, warn, info, debug. Default: error")
 	gop.StringVarLong(&opts.OutputFormat, "output-format", 'f', "text", "Output format: text, json. Default: text")
 
 	gop.IntVarLong(&opts.RunningOpsSamples, "running-ops-samples", 's',
-		fmt.Sprintf("Number of samples to collect for running ops. Default: %d", opts.RunningOpsSamples))
+		fmt.Sprintf("Number of samples to collect for running ops. Default: %d", opts.RunningOpsSamples),
+	)
 
 	gop.IntVarLong(&opts.RunningOpsInterval, "running-ops-interval", 'i',
-		fmt.Sprintf("Interval to wait betwwen running ops samples in milliseconds. Default %d milliseconds", opts.RunningOpsInterval))
+		fmt.Sprintf("Interval to wait betwwen running ops samples in milliseconds. Default %d milliseconds",
+			opts.RunningOpsInterval),
+	)
 
 	gop.StringVarLong(&opts.SSLCAFile, "sslCAFile", 0, "SSL CA cert file used for authentication")
 	gop.StringVarLong(&opts.SSLPEMKeyFile, "sslPEMKeyFile", 0, "SSL client PEM file used for authentication")