PMM-6494 Topology labels (#463)

* PMM-6494 Topology labels

Added common functions needed for topology lables in mongo exporter and
pt-mongodb-summary

* PMM-5723 Fix reviewdog.

Co-authored-by: Nurlan Moldomurov <nurlan.moldomurov@percona.com>

Gopkg.lock

@@ -201,6 +201,14 @@
   revision = "792786c7400a136282c1664665ae0a8db921c6c2"
   version = "v1.0.0"
 
+[[projects]]
+  digest = "1:9d1d58facb0409ecf634fec680d83b6f57f4e619458f7b7b5e4dda1665fd89ec"
+  name = "github.com/prometheus/common"
+  packages = ["log"]
+  pruneopts = ""
+  revision = "f39dfa2b000545b3a763b844012958c275a62266"
+  version = "v0.13.0"
+
 [[projects]]
   digest = "1:9d35a914be9b807050704f377becb1f864ee46b000f590566a8b9fb871d6c571"
   name = "github.com/shirou/gopsutil"
@@ -316,6 +324,8 @@
   packages = [
     "unix",
     "windows",
+    "windows/registry",
+    "windows/svc/eventlog",
   ]
   pruneopts = ""
   revision = "749cb33beabd9aa6d3178e3de05bcc914f70b2bf"
@@ -335,6 +345,25 @@
   revision = "342b2e1fbaa52c93f31447ad2c6abc048c63e475"
   version = "v0.3.2"
 
+[[projects]]
+  digest = "1:15d017551627c8bb091bde628215b2861bed128855343fdd570c62d08871f6e1"
+  name = "gopkg.in/alecthomas/kingpin.v2"
+  packages = ["."]
+  pruneopts = ""
+  revision = "947dcec5ba9c011838740e680966fd7087a71d0d"
+  version = "v2.2.6"
+
+[[projects]]
+  branch = "v2"
+  digest = "1:e56755c5336ff37d20befca76df29097085c85ea1fe58af746e3df6b815decfa"
+  name = "gopkg.in/mgo.v2"
+  packages = [
+    "bson",
+    "internal/json",
+  ]
+  pruneopts = ""
+  revision = "a6b53ec6cb22a3699387a57a161566f9402ee85b"
+
 [[projects]]
   branch = "v3"
   digest = "1:2e9c4d6def1d36dcd17730e00c06b49a2e97ea5e1e639bcd24fa60fa43e33ad6"
@@ -360,6 +389,7 @@
     "github.com/pborman/getopt",
     "github.com/percona/go-mysql/query",
     "github.com/pkg/errors",
+    "github.com/prometheus/common/log",
     "github.com/shirou/gopsutil/process",
     "github.com/sirupsen/logrus",
     "github.com/stretchr/testify/assert",
@@ -369,6 +399,7 @@
     "go.mongodb.org/mongo-driver/mongo",
     "go.mongodb.org/mongo-driver/mongo/options",
     "golang.org/x/crypto/ssh/terminal",
+    "gopkg.in/mgo.v2/bson",
   ]
   solver-name = "gps-cdcl"
   solver-version = 1

go.mod

@@ -6,8 +6,6 @@ require (
 	github.com/Masterminds/semver v1.4.2
 	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
 	github.com/alecthomas/kingpin v2.2.6+incompatible
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 // indirect
 	github.com/go-ini/ini v1.46.0
 	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/golang/mock v1.3.1-0.20190508161146-9fa652df1129
@@ -22,14 +20,14 @@ require (
 	github.com/pborman/getopt v0.0.0-20190409184431-ee0cd42419d3
 	github.com/percona/go-mysql v0.0.0-20190903141930-197f4ad8db8d
 	github.com/pkg/errors v0.9.1
+	github.com/prometheus/common v0.13.0
 	github.com/shirou/gopsutil v2.20.8+incompatible
-	github.com/sirupsen/logrus v1.4.2
+	github.com/sirupsen/logrus v1.6.0
-	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/stretchr/testify v1.6.1
 	github.com/xdg/stringprep v1.0.1-0.20180714160509-73f8eece6fdc // indirect
 	go.mongodb.org/mongo-driver v1.3.4
-	golang.org/x/crypto v0.0.0-20190907121410-71b5226ff739
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
-	golang.org/x/sys v0.0.0-20190904154756-749cb33beabd // indirect
 	gopkg.in/ini.v1 v1.61.0 // indirect
+	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
 )

go.sum

@@ -1,21 +1,78 @@
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 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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@@ -42,34 +99,103 @@ github.com/gobuffalo/packd v0.1.0/go.mod h1:M2Juc+hhDXf/PnmBANFCqx4DM3wRbgDvnVWe
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+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/ini.v1 v1.61.0 h1:LBCdW4FmFYL4s/vDZD1RQYX7oAR6IjujCYgMdbHBR10=
 gopkg.in/ini.v1 v1.61.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

src/go/internal/testutils/env.go

@@ -1,11 +1,16 @@
 package testutils
 
 import (
+	"context"
+	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 	"time"
+
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
 )
 
 const (
@@ -143,30 +148,70 @@ func BaseDir() string {
 	}
 
 	basedir = strings.TrimSpace(string(out))
+
 	return basedir
 }
 
 // GetMongoDBAddr returns the address of an instance by replicaset name and instance type like
-// (rs1, primary) or (rs1, secondary1)
+// (rs1, primary) or (rs1, secondary1).
 func GetMongoDBAddr(rs, name string) string {
 	if _, ok := hosts[rs]; !ok {
 		return ""
 	}
+
 	replset := hosts[rs]
+
 	if host, ok := replset[name]; ok {
 		return host
 	}
+
 	return ""
 }
 
-// GetMongoDBReplsetAddrs return the addresses of all instances for a replicaset name
+// GetMongoDBReplsetAddrs return the addresses of all instances for a replicaset name.
 func GetMongoDBReplsetAddrs(rs string) []string {
 	addrs := []string{}
+
 	if _, ok := hosts[rs]; !ok {
 		return addrs
 	}
+
 	for _, host := range hosts[rs] {
 		addrs = append(addrs, host)
 	}
+
 	return addrs
 }
+
+// TestClient returns a new MongoDB connection to the specified server port.
+func TestClient(ctx context.Context, port string) (*mongo.Client, error) {
+	if port == "" {
+		port = MongoDBShard1PrimaryPort
+	}
+
+	hostname := "127.0.0.1"
+	direct := true
+	to := time.Second
+	co := &options.ClientOptions{
+		ConnectTimeout: &to,
+		Hosts:          []string{net.JoinHostPort(hostname, port)},
+		Direct:         &direct,
+		Auth: &options.Credential{
+			Username:    MongoDBUser,
+			Password:    MongoDBPassword,
+			PasswordSet: true,
+		},
+	}
+
+	client, err := mongo.Connect(ctx, co)
+	if err != nil {
+		return nil, err
+	}
+
+	err = client.Ping(ctx, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return client, nil
+}

src/go/mongolib/proto/procinfo.go

@@ -0,0 +1,30 @@
+package proto
+
+import "time"
+
+type ProcInfo struct {
+	CreateTime time.Time
+	Path       string
+	UserName   string
+	Error      error
+}
+
+type GetHostInfo struct {
+	Hostname          string
+	HostOsType        string
+	HostSystemCPUArch string
+	HostDatabases     int
+	HostCollections   int
+	DBPath            string
+
+	ProcPath         string
+	ProcUserName     string
+	ProcCreateTime   time.Time
+	ProcProcessCount int
+
+	// Server Status
+	ProcessName    string
+	ReplicasetName string
+	Version        string
+	NodeType       string
+}

src/go/mongolib/proto/replstatus.go

@@ -1,6 +1,9 @@
 package proto
 
-import "go.mongodb.org/mongo-driver/bson/primitive"
+import (
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"gopkg.in/mgo.v2/bson"
+)
 
 const (
 	REPLICA_SET_MEMBER_STARTUP = iota
@@ -48,3 +51,83 @@ type ReplicaSetStatus struct {
 	Ok                      float64            `bson:"ok"`                      //
 	Set                     string             `bson:"set"`                     // Replica set name
 }
+
+type Member struct {
+	Host         string  `bson:"host"`
+	Votes        int32   `bson:"votes"`
+	ID           int32   `bson:"_id"`
+	SlaveDelay   int64   `bson:"slaveDelay"`
+	Priority     float64 `bson:"priority"`
+	BuildIndexes bool    `bson:"buildIndexes"`
+	ArbiterOnly  bool    `bson:"arbiterOnly"`
+	Hidden       bool    `bson:"hidden"`
+	Tags         bson.M  `bson:"tags"`
+}
+
+type RSConfig struct {
+	ID                                 string     `bson:"_id"`
+	ConfigServer                       bool       `bson:"configsvr"`
+	WriteConcernMajorityJournalDefault bool       `bson:"writeConcernMajorityJournalDefault"`
+	Version                            int32      `bson:"version"`
+	ProtocolVersion                    int64      `bson:"protocolVersion"`
+	Settings                           RSSettings `bson:"settings"`
+	Members                            []Member   `bson:"members"`
+}
+
+type LastErrorDefaults struct {
+	W        int32 `bson:"w"`
+	WTimeout int32 `bson:"wtimeout"`
+}
+
+type RSSettings struct {
+	HeartbeatTimeoutSecs       int32              `bson:"heartbeatTimeoutSecs"`
+	ElectionTimeoutMillis      int32              `bson:"electionTimeoutMillis"`
+	CatchUpTimeoutMillis       int32              `bson:"catchUpTimeoutMillis"`
+	GetLastErrorModes          bson.M             `bson:"getLastErrorModes"`
+	ChainingAllowed            bool               `bson:"chainingAllowed"`
+	HeartbeatIntervalMillis    int32              `bson:"heartbeatIntervalMillis"`
+	CatchUpTakeoverDelayMillis int32              `bson:"catchUpTakeoverDelayMillis"`
+	GetLastErrorDefaults       LastErrorDefaults  `bson:"getLastErrorDefaults"`
+	ReplicaSetID               primitive.ObjectID `bson:"replicaSetId"`
+}
+
+type Signature struct {
+	Hash  primitive.Binary `bson:"hash"`
+	KeyID int64            `bson:"keyId"`
+}
+
+type ClusterTime struct {
+	ClusterTime primitive.Timestamp `bson:"clusterTime"`
+	Signature   Signature           `bson:"signature"`
+}
+
+type ReplicasetConfig struct {
+	Config              RSConfig            `bson:"config"`
+	OK                  float64             `bson:"ok"`
+	LastCommittedOpTime primitive.Timestamp `bson:"lastCommittedOpTime"`
+	ClusterTime         ClusterTime         `bson:"$clusterTime"`
+	OperationTime       primitive.Timestamp `bson:"operationTime"`
+}
+
+type ConfigVersion struct {
+	ID                   int32              `bson:"_id"`
+	MinCompatibleVersion int32              `bson:"minCompatibleVersion"`
+	CurrentVersion       int32              `bson:"currentVersion"`
+	ClusterID            primitive.ObjectID `bson:"clusterId"`
+}
+
+type ShardIdentity struct {
+	ID                        string             `bson:"_id"`
+	ShardName                 string             `bson:"shardName"`
+	ClusterID                 primitive.ObjectID `bson:"clusterId"`
+	ConfigsvrConnectionString string             `bson:"configsvrConnectionString"`
+}
+
+// MyState is a subset of getDiagnosticData result used to tag metrics in the MongoDB exporter
+type MyState struct {
+	Data struct {
+		ReplicasetGetStatus struct {
+			MyState int `bson:"myState"`
+		} `bson:"replSetGetStatus"`
+	} `bson:"data"`
+}

src/go/mongolib/util/util.go

@@ -2,23 +2,39 @@ package util
 
 import (
 	"context"
+	"fmt"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/percona/percona-toolkit/src/go/mongolib/proto"
 	"github.com/pkg/errors"
+	"github.com/prometheus/common/log"
+	"github.com/shirou/gopsutil/process"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
+	"gopkg.in/mgo.v2/bson"
 )
 
 const (
+	TypeIsDBGrid    = "isdbgrid"
+	TypeMongos      = "mongos"
+	TypeMongod      = "mongod"
+	TypeShardServer = "shardsvr"
+
+	milliToSeconds              = 1000
 	shardingNotEnabledErrorCode = 203
+	ErrNotYetInitialized        = int32(94)
+	ErrNoReplicationEnabled     = int32(76)
 )
 
 var (
 	CannotGetQueryError     = errors.New("cannot get query field from the profile document (it is not a map)")
 	ShardingNotEnabledError = errors.New("sharding not enabled")
+
+	ErrCannotGetProcess   = fmt.Errorf("cannot get process")
+	ErrCannotGetClusterID = fmt.Errorf("cannot get cluster ID")
 )
 
 func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOptions) ([]proto.Members, error) {
@@ -26,6 +42,7 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 	if err != nil {
 		return nil, errors.Wrap(err, "cannot get a new client for GetReplicasetMembers")
 	}
+
 	if err := client.Connect(ctx); err != nil {
 		return nil, errors.Wrap(err, "cannot connect to MongoDB")
 	}
@@ -34,6 +51,7 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 	if err != nil {
 		return nil, err
 	}
+
 	if err := client.Disconnect(ctx); err != nil {
 		return nil, errors.Wrapf(err, "cannot disconnect from %v", clientOptions.Hosts)
 	}
@@ -54,7 +72,10 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 		cmdOpts := proto.CommandLineOptions{}
 		// Not always we can get this info. For examples, we cannot get this for hidden hosts so
 		// if there is an error, just ignore it
-		res := client.Database("admin").RunCommand(ctx, primitive.D{{"getCmdLineOpts", 1}, {"recordStats", 1}})
+		res := client.Database("admin").RunCommand(ctx, primitive.D{
+			{Key: "getCmdLineOpts", Value: 1},
+			{Key: "recordStats", Value: 1},
+		})
 		if res.Err() == nil {
 			if err := res.Decode(&cmdOpts); err != nil {
 				return nil, errors.Wrapf(err, "cannot decode getCmdLineOpts response for host %s", hostname)
@@ -62,6 +83,7 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 		}
 
 		rss := proto.ReplicaSetStatus{}
+
 		res = client.Database("admin").RunCommand(ctx, primitive.M{"replSetGetStatus": 1})
 		if res.Err() != nil {
 			m := proto.Members{
@@ -73,26 +95,34 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 				m.ID = serverStatus.Pid
 				m.StorageEngine = serverStatus.StorageEngine
 			}
+
 			membersMap[m.Name] = m
+
 			continue // If a host is a mongos we cannot get info but is not a real error
 		}
 
 		if err := res.Decode(&rss); err != nil {
 			return nil, errors.Wrap(err, "cannot decode replSetGetStatus response")
 		}
+
 		for _, m := range rss.Members {
 			if _, ok := membersMap[m.Name]; ok {
 				continue // already exists
 			}
+
 			m.Set = rss.Set
+
 			if serverStatus, err := GetServerStatus(ctx, client); err == nil {
 				m.ID = serverStatus.Pid
 				m.StorageEngine = serverStatus.StorageEngine
+
 				if cmdOpts.Parsed.Sharding.ClusterRole != "" {
 					m.StateStr = cmdOpts.Parsed.Sharding.ClusterRole + "/" + m.StateStr
 				}
+
 				m.StateStr = strings.ToUpper(m.StateStr)
 			}
+
 			membersMap[m.Name] = m
 		}
 
@@ -104,30 +134,36 @@ func GetReplicasetMembers(ctx context.Context, clientOptions *options.ClientOpti
 	}
 
 	sort.Slice(members, func(i, j int) bool { return members[i].Name < members[j].Name })
+
 	return members, nil
 }
 
 func GetHostnames(ctx context.Context, client *mongo.Client) ([]string, error) {
 	// Probably we are connected to an individual member of a replica set
 	rss := proto.ReplicaSetStatus{}
+
 	res := client.Database("admin").RunCommand(ctx, primitive.M{"replSetGetStatus": 1})
 	if res.Err() == nil {
 		if err := res.Decode(&rss); err != nil {
 			return nil, errors.Wrap(err, "cannot decode replSetGetStatus response for GetHostnames")
 		}
+
 		return buildHostsListFromReplStatus(rss), nil
 	}
 
 	// Try getShardMap first. If we are connected to a mongos it will return
 	// all hosts, including config hosts
 	var shardsMap proto.ShardsMap
+
 	smRes := client.Database("admin").RunCommand(ctx, primitive.M{"getShardMap": 1})
 	if smRes.Err() != nil {
 		if e, ok := smRes.Err().(mongo.CommandError); ok && e.Code == shardingNotEnabledErrorCode {
 			return nil, ShardingNotEnabledError // standalone instance
 		}
+
 		return nil, errors.Wrap(smRes.Err(), "cannot getShardMap for GetHostnames")
 	}
+
 	if err := smRes.Decode(&shardsMap); err != nil {
 		return nil, errors.Wrap(err, "cannot decode getShardMap result for GetHostnames")
 	}
@@ -145,48 +181,47 @@ func GetHostnames(ctx context.Context, client *mongo.Client) ([]string, error) {
 	return nil, nil // standalone instance
 }
 
+/*
+   "members" : [
+            {
+                    "_id" : 0,
+                    "name" : "localhost:17001",
+                    "health" : 1,
+                    "state" : 1,
+                    "stateStr" : "PRIMARY",
+                    "uptime" : 4700,
+                    "optime" : Timestamp(1486554836, 1),
+                    "optimeDate" : ISODate("2017-02-08T11:53:56Z"),
+                    "electionTime" : Timestamp(1486651810, 1),
+                    "electionDate" : ISODate("2017-02-09T14:50:10Z"),
+                    "configVersion" : 1,
+                    "self" : true
+            },
+*/
 func buildHostsListFromReplStatus(replStatus proto.ReplicaSetStatus) []string {
-	/*
-	   "members" : [
-	            {
-	                    "_id" : 0,
-	                    "name" : "localhost:17001",
-	                    "health" : 1,
-	                    "state" : 1,
-	                    "stateStr" : "PRIMARY",
-	                    "uptime" : 4700,
-	                    "optime" : Timestamp(1486554836, 1),
-	                    "optimeDate" : ISODate("2017-02-08T11:53:56Z"),
-	                    "electionTime" : Timestamp(1486651810, 1),
-	                    "electionDate" : ISODate("2017-02-09T14:50:10Z"),
-	                    "configVersion" : 1,
-	                    "self" : true
-	            },
-	*/
-
 	hostnames := []string{}
 	for _, member := range replStatus.Members {
 		hostnames = append(hostnames, member.Name)
 	}
+
 	sort.Strings(hostnames) // to make testing easier
 
 	return hostnames
 }
 
+/* Example
+mongos> db.getSiblingDB('admin').runCommand('getShardMap')
+{
+  "map" : {
+    "config" : "localhost:19001,localhost:19002,localhost:19003",
+    "localhost:17001" : "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",
+  },
+  "ok" : 1
+}.
+*/
 func buildHostsListFromShardMap(shardsMap proto.ShardsMap) []string {
-	/* Example
-	mongos> db.getSiblingDB('admin').runCommand('getShardMap')
-	{
-	  "map" : {
-	    "config" : "localhost:19001,localhost:19002,localhost:19003",
-	    "localhost:17001" : "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",
-	  },
-	  "ok" : 1
-	}
-	*/
-
 	hostnames := []string{}
 	hm := make(map[string]bool)
 
@@ -197,10 +232,11 @@ func buildHostsListFromShardMap(shardsMap proto.ShardsMap) []string {
 		for _, val := range shardsMap.Map {
 			m := strings.Split(val, "/")
 			hostsStr := ""
+
 			switch len(m) {
 			case 1:
 				hostsStr = m[0] // there is no / in the hosts list
-			case 2:
+			case 2: //nolint
 				hostsStr = m[1] // there is a / in the string. Remove the prefix until the / and keep the rest
 			}
 			// since there is no Sets in Go, build a map where the value is the map key
@@ -209,33 +245,39 @@ func buildHostsListFromShardMap(shardsMap proto.ShardsMap) []string {
 				hm[host] = false
 			}
 		}
+
 		for host := range hm {
 			hostnames = append(hostnames, host)
 		}
 	}
 
 	sort.Strings(hostnames)
+
 	return hostnames
 }
 
 // GetShardedHosts is like GetHostnames but it uses listShards instead of getShardMap
-// so it won't include config servers in the returned list
+// so it won't include config servers in the returned list.
 func GetShardedHosts(ctx context.Context, client *mongo.Client) ([]string, error) {
 	shardsInfo := &proto.ShardsInfo{}
+
 	res := client.Database("admin").RunCommand(ctx, primitive.M{"listShards": 1})
 	if res.Err() != nil {
 		return nil, errors.Wrap(res.Err(), "cannot list shards")
 	}
+
 	if err := res.Decode(&shardsInfo); err != nil {
 		return nil, errors.Wrap(err, "cannot decode listShards response")
 	}
 
 	hostnames := []string{}
+
 	for _, shardInfo := range shardsInfo.Shards {
 		m := strings.Split(shardInfo.Host, "/")
 		h := strings.Split(m[1], ",")
 		hostnames = append(hostnames, h[0])
 	}
+
 	return hostnames, nil
 }
 
@@ -248,6 +290,7 @@ func GetServerStatus(ctx context.Context, client *mongo.Client) (proto.ServerSta
 		{Key: "recordStats", Value: 1},
 	}
 	res := client.Database("admin").RunCommand(ctx, query)
+
 	if res.Err() != nil {
 		return ss, errors.Wrap(res.Err(), "GetHostInfo.serverStatus")
 	}
@@ -265,14 +308,17 @@ func GetQueryField(doc proto.SystemProfile) (primitive.M, error) {
 	// however MongoDB 3.0 doesn't have that field
 	// so we need to detect protocol by looking at actual data.
 	query := doc.Query
-	if len(doc.Command) > 0 {
+
+	if len(doc.Command) > 0 { //nolint
 		query = doc.Command
+
 		if doc.Op == "update" || doc.Op == "remove" {
 			if squery, ok := query.Map()["q"]; ok {
 				// just an extra check to ensure this type assertion won't fail
 				if ssquery, ok := squery.(primitive.M); ok {
 					return ssquery, nil
 				}
+
 				return nil, CannotGetQueryError
 			}
 		}
@@ -309,6 +355,7 @@ func GetQueryField(doc proto.SystemProfile) (primitive.M, error) {
 		if ssquery, ok := squery.(primitive.M); ok {
 			return ssquery, nil
 		}
+
 		return nil, CannotGetQueryError
 	}
 
@@ -317,6 +364,7 @@ func GetQueryField(doc proto.SystemProfile) (primitive.M, error) {
 		if ssquery, ok := squery.(primitive.M); ok {
 			return ssquery, nil
 		}
+
 		return nil, CannotGetQueryError
 	}
 
@@ -333,5 +381,173 @@ func GetQueryField(doc proto.SystemProfile) (primitive.M, error) {
 func GetClientForHost(co *options.ClientOptions, newHost string) (*mongo.Client, error) {
 	newOptions := options.MergeClientOptions(co, &options.ClientOptions{Hosts: []string{newHost}})
 	newOptions.SetDirect(true)
+
 	return mongo.NewClient(newOptions)
 }
+
+func GetHostInfo(ctx context.Context, client *mongo.Client) (*proto.GetHostInfo, error) {
+	hi := proto.HostInfo{}
+	if err := client.Database("admin").RunCommand(ctx, primitive.M{"hostInfo": 1}).Decode(&hi); err != nil {
+		log.Debugf("run('hostInfo') error: %s", err)
+		return nil, errors.Wrap(err, "GetHostInfo.hostInfo")
+	}
+
+	cmdOpts := proto.CommandLineOptions{}
+	query := primitive.D{{Key: "getCmdLineOpts", Value: 1}, {Key: "recordStats", Value: 1}}
+
+	err := client.Database("admin").RunCommand(ctx, query).Decode(&cmdOpts)
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot get command line options")
+	}
+
+	ss := proto.ServerStatus{}
+	query = primitive.D{{Key: "serverStatus", Value: 1}, {Key: "recordStats", Value: 1}}
+
+	if err := client.Database("admin").RunCommand(ctx, query).Decode(&ss); err != nil {
+		return nil, errors.Wrap(err, "GetHostInfo.serverStatus")
+	}
+
+	pi := proto.ProcInfo{}
+	if err := fillProcInfo(int32(ss.Pid), &pi); err != nil {
+		pi.Error = err
+	}
+
+	nodeType, _ := getNodeType(ctx, client)
+	procCount, _ := countMongodProcesses()
+
+	i := &proto.GetHostInfo{
+		Hostname:          hi.System.Hostname,
+		HostOsType:        hi.Os.Type,
+		HostSystemCPUArch: hi.System.CpuArch,
+		DBPath:            "", // Sets default. It will be overridden later if necessary
+
+		ProcessName:      ss.Process,
+		ProcProcessCount: procCount,
+		Version:          ss.Version,
+		NodeType:         nodeType,
+
+		ProcPath:       pi.Path,
+		ProcUserName:   pi.UserName,
+		ProcCreateTime: pi.CreateTime,
+	}
+	if ss.Repl != nil {
+		i.ReplicasetName = ss.Repl.SetName
+	}
+
+	if cmdOpts.Parsed.Storage.DbPath != "" {
+		i.DBPath = cmdOpts.Parsed.Storage.DbPath
+	}
+
+	return i, nil
+}
+
+func ClusterID(ctx context.Context, client *mongo.Client) (string, error) {
+	var cv proto.ConfigVersion
+	if err := client.Database("config").Collection("version").FindOne(ctx, bson.M{}).Decode(&cv); err == nil {
+		return cv.ClusterID.Hex(), nil
+	}
+
+	var si proto.ShardIdentity
+
+	filter := bson.M{"_id": "shardIdentity"}
+
+	if err := client.Database("admin").Collection("system.version").FindOne(ctx, filter).Decode(&si); err == nil {
+		return si.ClusterID.Hex(), nil
+	}
+
+	rc, err := ReplicasetConfig(ctx, client)
+	if err != nil {
+		if e, ok := err.(mongo.CommandError); ok && IsReplicationNotEnabledError(e) {
+			return "", nil
+		}
+
+		return "", err
+	}
+
+	return rc.Config.Settings.ReplicaSetID.Hex(), nil
+}
+
+func IsReplicationNotEnabledError(err mongo.CommandError) bool {
+	return err.Code == ErrNotYetInitialized || err.Code == ErrNoReplicationEnabled
+}
+
+func MyState(ctx context.Context, client *mongo.Client) (int, error) {
+	var ms proto.MyState
+	if err := client.Database("admin").RunCommand(ctx, bson.M{"getDiagnosticData": 1}).Decode(&ms); err != nil {
+		return 0, err
+	}
+
+	return ms.Data.ReplicasetGetStatus.MyState, nil
+}
+
+func ReplicasetConfig(ctx context.Context, client *mongo.Client) (*proto.ReplicasetConfig, error) {
+	var rs proto.ReplicasetConfig
+	if err := client.Database("admin").RunCommand(ctx, bson.M{"replSetGetConfig": 1}).Decode(&rs); err != nil {
+		return nil, err
+	}
+
+	return &rs, nil
+}
+
+func fillProcInfo(pid int32, procInfo *proto.ProcInfo) error {
+	proc, err := process.NewProcess(pid)
+	if err != nil {
+		return errors.Wrapf(ErrCannotGetProcess, "%s", err)
+	}
+
+	ct, err := proc.CreateTime()
+	if err != nil {
+		return err
+	}
+
+	procInfo.CreateTime = time.Unix(ct/milliToSeconds, 0)
+
+	if procInfo.Path, err = proc.Exe(); err != nil {
+		return err
+	}
+
+	if procInfo.UserName, err = proc.Username(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func getNodeType(ctx context.Context, client *mongo.Client) (string, error) {
+	md := proto.MasterDoc{}
+	if err := client.Database("admin").RunCommand(ctx, primitive.M{"isMaster": 1}).Decode(&md); err != nil {
+		return "", err
+	}
+
+	if md.SetName != nil || md.Hosts != nil {
+		return TypeShardServer, nil
+	} else if md.Msg == TypeIsDBGrid {
+		// isdbgrid is always the msg value when calling isMaster on a mongos
+		// see http://docs.mongodb.org/manual/core/sharded-cluster-query-router/
+		return TypeMongos, nil
+	}
+
+	return TypeMongod, nil
+}
+
+func countMongodProcesses() (int, error) {
+	pids, err := process.Pids()
+	if err != nil {
+		return 0, err
+	}
+
+	count := 0
+
+	for _, pid := range pids {
+		p, err := process.NewProcess(pid)
+		if err != nil {
+			continue
+		}
+
+		if name, _ := p.Name(); name == TypeMongod || name == TypeMongos {
+			count++
+		}
+	}
+
+	return count, nil
+}

src/go/mongolib/util/util_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	tu "github.com/percona/percona-toolkit/src/go/internal/testutils"
+	"github.com/stretchr/testify/assert"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
@@ -20,34 +21,58 @@ func TestGetHostnames(t *testing.T) {
 		wantError bool
 	}{
 		{
-			name:      "from_mongos",
+			name: "from_mongos",
-			uri:       fmt.Sprintf("mongodb://%s:%s@%s:%s", tu.MongoDBUser, tu.MongoDBPassword, tu.MongoDBHost, tu.MongoDBMongosPort),
+			uri: fmt.Sprintf("mongodb://%s:%s@%s:%s",
+				tu.MongoDBUser,
+				tu.MongoDBPassword,
+				tu.MongoDBHost,
+				tu.MongoDBMongosPort,
+			),
 			want:      []string{"127.0.0.1:17001", "127.0.0.1:17002", "127.0.0.1:17004", "127.0.0.1:17005", "127.0.0.1:17007"},
 			wantError: false,
 		},
 		{
-			name:      "from_mongod",
+			name: "from_mongod",
-			uri:       fmt.Sprintf("mongodb://%s:%s@%s:%s", tu.MongoDBUser, tu.MongoDBPassword, tu.MongoDBHost, tu.MongoDBShard1PrimaryPort),
+			uri: fmt.Sprintf("mongodb://%s:%s@%s:%s",
+				tu.MongoDBUser,
+				tu.MongoDBPassword,
+				tu.MongoDBHost,
+				tu.MongoDBShard1PrimaryPort,
+			),
 			want:      []string{"127.0.0.1:17001", "127.0.0.1:17002", "127.0.0.1:17003"},
 			wantError: false,
 		},
 		{
-			name:      "from_non_sharded",
+			name: "from_non_sharded",
-			uri:       fmt.Sprintf("mongodb://%s:%s@%s:%s", tu.MongoDBUser, tu.MongoDBPassword, tu.MongoDBHost, tu.MongoDBShard3PrimaryPort),
+			uri: fmt.Sprintf("mongodb://%s:%s@%s:%s",
+				tu.MongoDBUser,
+				tu.MongoDBPassword,
+				tu.MongoDBHost,
+				tu.MongoDBShard3PrimaryPort,
+			),
 			want:      []string{"127.0.0.1:17021", "127.0.0.1:17022", "127.0.0.1:17023"},
 			wantError: false,
 		},
 		{
-			name:      "from_standalone",
+			name: "from_standalone",
-			uri:       fmt.Sprintf("mongodb://%s:%s@%s:%s", tu.MongoDBUser, tu.MongoDBPassword, tu.MongoDBHost, tu.MongoDBStandalonePort),
+			uri: fmt.Sprintf("mongodb://%s:%s@%s:%s",
+				tu.MongoDBUser,
+				tu.MongoDBPassword,
+				tu.MongoDBHost,
+				tu.MongoDBStandalonePort,
+			),
 			want:      nil,
 			wantError: true,
 		},
 	}
 
 	for _, test := range testCases {
+		uri := test.uri
+		want := test.want
+		wantError := test.wantError
+
 		t.Run(test.name, func(t *testing.T) {
-			client, err := mongo.NewClient(options.Client().ApplyURI(test.uri))
+			client, err := mongo.NewClient(options.Client().ApplyURI(uri))
 			if err != nil {
 				t.Fatalf("cannot get a new MongoDB client: %s", err)
 			}
@@ -59,12 +84,12 @@ func TestGetHostnames(t *testing.T) {
 			}
 
 			hostnames, err := GetHostnames(ctx, client)
-			if err != nil && !test.wantError {
+			if err != nil && !wantError {
 				t.Errorf("Expecting error=nil, got: %v", err)
 			}
 
-			if !reflect.DeepEqual(hostnames, test.want) {
+			if !reflect.DeepEqual(hostnames, want) {
-				t.Errorf("Invalid hostnames. Got: %+v, want %+v", hostnames, test.want)
+				t.Errorf("Invalid hostnames. Got: %+v, want %+v", hostnames, want)
 			}
 		})
 	}
@@ -194,3 +219,139 @@ func TestGetShardedHosts(t *testing.T) {
 		})
 	}
 }
+
+func TestReplicasetConfig(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	tcs := []struct {
+		port             string
+		wantID           string
+		wantConfigServer bool
+		wantError        error
+	}{
+		{
+			port:             tu.MongoDBStandalonePort,
+			wantID:           "",
+			wantConfigServer: false,
+			wantError: mongo.CommandError{
+				Code:    76,
+				Message: "not running with --replSet",
+				Labels:  []string(nil),
+				Name:    "NoReplicationEnabled",
+				Wrapped: error(nil),
+			},
+		},
+		{
+			port:             tu.MongoDBMongosPort,
+			wantID:           "",
+			wantConfigServer: false,
+			wantError: mongo.CommandError{
+				Code:    59,
+				Message: "no such cmd: replSetGetConfig",
+				Labels:  []string(nil),
+				Name:    "CommandNotFound",
+				Wrapped: error(nil),
+			},
+		},
+		{
+			port:             tu.MongoDBShard1PrimaryPort,
+			wantID:           "rs1",
+			wantConfigServer: false,
+		},
+		{
+			port:             tu.MongoDBConfigsvr1Port,
+			wantID:           "csReplSet",
+			wantConfigServer: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		client, err := tu.TestClient(ctx, tc.port)
+		assert.NoError(t, err)
+
+		rs, err := ReplicasetConfig(ctx, client)
+		assert.Equal(t, tc.wantError, err, fmt.Sprintf("%v", tc.port))
+		if tc.wantError != nil {
+			continue
+		}
+		assert.Equal(t, tc.wantID, rs.Config.ID)
+		assert.Equal(t, tc.wantConfigServer, rs.Config.ConfigServer)
+		assert.NotEmpty(t, rs.Config.Settings.ReplicaSetID.Hex())
+	}
+}
+
+func TestClusterID(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	tcs := []struct {
+		port    string
+		emptyID bool
+	}{
+		{
+			port:    tu.MongoDBMongosPort,
+			emptyID: false,
+		},
+		{
+			port:    tu.MongoDBShard1PrimaryPort,
+			emptyID: false,
+		},
+		{
+			port:    tu.MongoDBShard1Secondary1Port,
+			emptyID: false,
+		},
+		{
+			port:    tu.MongoDBConfigsvr1Port,
+			emptyID: false,
+		},
+		{
+			port:    tu.MongoDBStandalonePort,
+			emptyID: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		client, err := tu.TestClient(ctx, tc.port)
+		assert.NoError(t, err)
+		cid, err := ClusterID(ctx, client)
+		assert.NoError(t, err, fmt.Sprintf("port: %v", tc.port))
+		assert.Equal(t, cid == "", tc.emptyID)
+	}
+}
+
+func TestMyState(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	tcs := []struct {
+		port string
+		want int
+	}{
+		{
+			port: tu.MongoDBShard1PrimaryPort,
+			want: 1,
+		},
+		{
+			port: tu.MongoDBShard1Secondary1Port,
+			want: 2,
+		},
+		{
+			port: tu.MongoDBMongosPort,
+			want: 0,
+		},
+		{
+			port: tu.MongoDBStandalonePort,
+			want: 0,
+		},
+	}
+
+	for _, tc := range tcs {
+		client, err := tu.TestClient(ctx, tc.port)
+		assert.NoError(t, err)
+
+		state, err := MyState(ctx, client)
+		assert.NoError(t, err)
+		assert.Equal(t, tc.want, state, fmt.Sprintf("port: %v", tc.port))
+	}
+}

src/go/runtests.sh

@@ -6,12 +6,12 @@ cd $BASEDIR
 
 source ${BASEDIR}/src/go/setenv.sh
 
-for dir in $(ls -d ./src/go/pt-*)
+for dir in $(ls -d ./src/go/pt-* ) ./src/go/mongolib
 do 
   echo "Running tests at $BASEDIR/$dir"
   cd $BASEDIR/$dir
   go get ./...
-  go test -v -coverprofile=coverage.out
+  go test -v -coverprofile=coverage.out ./...
   if [ -f coverage.out ]
   then
       go tool cover -func=coverage.out