Moved system package inputs out to top level (#4406)

plugins/inputs/all/all.go

@@ -17,7 +17,10 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/consul"
 	_ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
 	_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/cpu"
 	_ "github.com/influxdata/telegraf/plugins/inputs/dcos"
+	_ "github.com/influxdata/telegraf/plugins/inputs/disk"
+	_ "github.com/influxdata/telegraf/plugins/inputs/diskio"
 	_ "github.com/influxdata/telegraf/plugins/inputs/disque"
 	_ "github.com/influxdata/telegraf/plugins/inputs/dmcache"
 	_ "github.com/influxdata/telegraf/plugins/inputs/dns_query"
@@ -48,12 +51,16 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/kafka_consumer"
 	_ "github.com/influxdata/telegraf/plugins/inputs/kafka_consumer_legacy"
 	_ "github.com/influxdata/telegraf/plugins/inputs/kapacitor"
+	_ "github.com/influxdata/telegraf/plugins/inputs/kernel"
+	_ "github.com/influxdata/telegraf/plugins/inputs/kernel_vmstat"
 	_ "github.com/influxdata/telegraf/plugins/inputs/kubernetes"
 	_ "github.com/influxdata/telegraf/plugins/inputs/leofs"
+	_ "github.com/influxdata/telegraf/plugins/inputs/linux_sysctl_fs"
 	_ "github.com/influxdata/telegraf/plugins/inputs/logparser"
 	_ "github.com/influxdata/telegraf/plugins/inputs/lustre2"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mailchimp"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mcrouter"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mem"
 	_ "github.com/influxdata/telegraf/plugins/inputs/memcached"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mesos"
 	_ "github.com/influxdata/telegraf/plugins/inputs/minecraft"
@@ -62,6 +69,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/mysql"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nats"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nats_consumer"
+	_ "github.com/influxdata/telegraf/plugins/inputs/net"
 	_ "github.com/influxdata/telegraf/plugins/inputs/net_response"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nginx"
 	_ "github.com/influxdata/telegraf/plugins/inputs/nginx_plus"
@@ -80,6 +88,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/postgresql"
 	_ "github.com/influxdata/telegraf/plugins/inputs/postgresql_extensible"
 	_ "github.com/influxdata/telegraf/plugins/inputs/powerdns"
+	_ "github.com/influxdata/telegraf/plugins/inputs/processes"
 	_ "github.com/influxdata/telegraf/plugins/inputs/procstat"
 	_ "github.com/influxdata/telegraf/plugins/inputs/prometheus"
 	_ "github.com/influxdata/telegraf/plugins/inputs/puppetagent"
@@ -97,6 +106,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/solr"
 	_ "github.com/influxdata/telegraf/plugins/inputs/sqlserver"
 	_ "github.com/influxdata/telegraf/plugins/inputs/statsd"
+	_ "github.com/influxdata/telegraf/plugins/inputs/swap"
 	_ "github.com/influxdata/telegraf/plugins/inputs/syslog"
 	_ "github.com/influxdata/telegraf/plugins/inputs/sysstat"
 	_ "github.com/influxdata/telegraf/plugins/inputs/system"

plugins/inputs/cpu/cpu.go

@@ -1,4 +1,4 @@
-package system
+package cpu
 
 import (
 	"fmt"
@@ -6,11 +6,12 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/shirou/gopsutil/cpu"
 )
 
 type CPUStats struct {
-	ps        PS
+	ps        system.PS
 	lastStats map[string]cpu.TimesStat
 
 	PerCPU         bool `toml:"percpu"`
@@ -19,7 +20,7 @@ type CPUStats struct {
 	ReportActive   bool `toml:"report_active"`
 }
 
-func NewCPUStats(ps PS) *CPUStats {
+func NewCPUStats(ps system.PS) *CPUStats {
 	return &CPUStats{
 		ps:             ps,
 		CollectCPUTime: true,
@@ -146,7 +147,7 @@ func init() {
 		return &CPUStats{
 			PerCPU:   true,
 			TotalCPU: true,
-			ps:       newSystemPS(),
+			ps:       system.NewSystemPS(),
 		}
 	})
 }

plugins/inputs/cpu/cpu_test.go

@@ -1,9 +1,10 @@
-package system
+package cpu
 
 import (
 	"fmt"
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/cpu"
 	"github.com/stretchr/testify/assert"
@@ -11,7 +12,7 @@ import (
 )
 
 func TestCPUStats(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator
 
@@ -68,7 +69,7 @@ func TestCPUStats(t *testing.T) {
 	assertContainsTaggedFloat(t, &acc, "cpu", "time_guest", 3.1, 0, cputags)
 	assertContainsTaggedFloat(t, &acc, "cpu", "time_guest_nice", 0.324, 0, cputags)
 
-	mps2 := MockPS{}
+	mps2 := system.MockPS{}
 	mps2.On("CPUTimes").Return([]cpu.TimesStat{cts2}, nil)
 	cs.ps = &mps2
 
@@ -153,8 +154,8 @@ func assertContainsTaggedFloat(
 // TestCPUCountChange tests that no errors are encountered if the number of
 // CPUs increases as reported with LXC.
 func TestCPUCountIncrease(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
-	var mps2 MockPS
+	var mps2 system.MockPS
 	var acc testutil.Accumulator
 	var err error
 
@@ -188,7 +189,7 @@ func TestCPUCountIncrease(t *testing.T) {
 // TestCPUTimesDecrease tests that telegraf continue to works after
 // CPU times decrease, which seems to occur when Linux system is suspended.
 func TestCPUTimesDecrease(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator
 
@@ -230,7 +231,7 @@ func TestCPUTimesDecrease(t *testing.T) {
 	assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 80, 0, cputags)
 	assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 2, 0, cputags)
 
-	mps2 := MockPS{}
+	mps2 := system.MockPS{}
 	mps2.On("CPUTimes").Return([]cpu.TimesStat{cts2}, nil)
 	cs.ps = &mps2
 
@@ -238,7 +239,7 @@ func TestCPUTimesDecrease(t *testing.T) {
 	err = cs.Gather(&acc)
 	require.Error(t, err)
 
-	mps3 := MockPS{}
+	mps3 := system.MockPS{}
 	mps3.On("CPUTimes").Return([]cpu.TimesStat{cts3}, nil)
 	cs.ps = &mps3
 

plugins/inputs/disk/disk.go

@@ -1,4 +1,4 @@
-package system
+package disk
 
 import (
 	"fmt"
@@ -6,10 +6,11 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 type DiskStats struct {
-	ps PS
+	ps system.PS
 
 	// Legacy support
 	Mountpoints []string
@@ -105,7 +106,7 @@ func parseOptions(opts string) MountOptions {
 }
 
 func init() {
-	ps := newSystemPS()
+	ps := system.NewSystemPS()
 	inputs.Add("disk", func() telegraf.Input {
 		return &DiskStats{ps: ps}
 	})

plugins/inputs/disk/disk_test.go

@@ -1,9 +1,10 @@
-package system
+package disk
 
 import (
 	"os"
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/disk"
 	"github.com/stretchr/testify/assert"
@@ -17,7 +18,7 @@ type MockFileInfo struct {
 
 func TestDiskUsage(t *testing.T) {
 	mck := &mock.Mock{}
-	mps := MockPSDisk{&systemPS{&mockDiskUsage{mck}}, mck}
+	mps := system.MockPSDisk{SystemPS: &system.SystemPS{PSDiskDeps: &system.MockDiskUsage{Mock: mck}}, Mock: mck}
 	defer mps.AssertExpectations(t)
 
 	var acc testutil.Accumulator
@@ -229,7 +230,7 @@ func TestDiskUsageHostMountPrefix(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			mck := &mock.Mock{}
-			mps := MockPSDisk{&systemPS{&mockDiskUsage{mck}}, mck}
+			mps := system.MockPSDisk{SystemPS: &system.SystemPS{PSDiskDeps: &system.MockDiskUsage{Mock: mck}}, Mock: mck}
 			defer mps.AssertExpectations(t)
 
 			var acc testutil.Accumulator
@@ -252,7 +253,7 @@ func TestDiskUsageHostMountPrefix(t *testing.T) {
 }
 
 func TestDiskStats(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator
 	var err error

plugins/inputs/diskio/diskio.go

@@ -1,4 +1,4 @@
-package system
+package diskio
 
 import (
 	"fmt"
@@ -9,6 +9,7 @@ import (
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/filter"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 var (
@@ -16,7 +17,7 @@ var (
 )
 
 type DiskIO struct {
-	ps PS
+	ps system.PS
 
 	Devices          []string
 	DeviceTags       []string
@@ -189,7 +190,7 @@ func (s *DiskIO) diskTags(devName string) map[string]string {
 }
 
 func init() {
-	ps := newSystemPS()
+	ps := system.NewSystemPS()
 	inputs.Add("diskio", func() telegraf.Input {
 		return &DiskIO{ps: ps, SkipSerialNumber: true}
 	})

plugins/inputs/diskio/diskio_linux.go

@@ -1,4 +1,4 @@
-package system
+package diskio
 
 import (
 	"bufio"

plugins/inputs/diskio/diskio_linux_test.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package system
+package diskio
 
 import (
 	"io/ioutil"

plugins/inputs/diskio/diskio_other.go

@@ -1,6 +1,6 @@
 // +build !linux
 
-package system
+package diskio
 
 type diskInfoCache struct{}
 

plugins/inputs/diskio/diskio_test.go

@@ -1,8 +1,9 @@
-package system
+package diskio
 
 import (
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/disk"
 	"github.com/stretchr/testify/require"
@@ -96,7 +97,7 @@ func TestDiskIO(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			var mps MockPS
+			var mps system.MockPS
 			mps.On("DiskIO").Return(tt.result.stats, tt.result.err)
 
 			var acc testutil.Accumulator

plugins/inputs/kernel/kernel.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package system
+package kernel
 
 import (
 	"bytes"

plugins/inputs/kernel/kernel_notlinux.go

@@ -1,6 +1,6 @@
 // +build !linux
 
-package system
+package kernel
 
 import (
 	"github.com/influxdata/telegraf"

plugins/inputs/kernel/kernel_test.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package system
+package kernel
 
 import (
 	"io/ioutil"
@@ -168,7 +168,7 @@ const entropyStatFile_Partial = `1024`
 const entropyStatFile_Invalid = ``
 
 func makeFakeStatFile(content []byte) string {
-	tmpfile, err := ioutil.TempFile("", "kerneltest")
+	tmpfile, err := ioutil.TempFile("", "kernel_test")
 	if err != nil {
 		panic(err)
 	}

plugins/inputs/kernel_vmstat/kernel_vmstat.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package system
+package kernel_vmstat
 
 import (
 	"bytes"

plugins/inputs/kernel_vmstat/kernel_vmstat_notlinux.go

@@ -0,0 +1,3 @@
+// +build !linux
+
+package kernel_vmstat

plugins/inputs/kernel_vmstat/kernel_vmstat_test.go

@@ -1,6 +1,6 @@
 // +build linux
 
-package system
+package kernel_vmstat
 
 import (
 	"io/ioutil"
@@ -13,7 +13,7 @@ import (
 )
 
 func TestFullVmStatProcFile(t *testing.T) {
-	tmpfile := makeFakeStatFile([]byte(vmStatFile_Full))
+	tmpfile := makeFakeVmStatFile([]byte(vmStatFile_Full))
 	defer os.Remove(tmpfile)
 
 	k := KernelVmstat{
@@ -121,7 +121,7 @@ func TestFullVmStatProcFile(t *testing.T) {
 }
 
 func TestPartialVmStatProcFile(t *testing.T) {
-	tmpfile := makeFakeStatFile([]byte(vmStatFile_Partial))
+	tmpfile := makeFakeVmStatFile([]byte(vmStatFile_Partial))
 	defer os.Remove(tmpfile)
 
 	k := KernelVmstat{
@@ -151,7 +151,7 @@ func TestPartialVmStatProcFile(t *testing.T) {
 }
 
 func TestInvalidVmStatProcFile1(t *testing.T) {
-	tmpfile := makeFakeStatFile([]byte(vmStatFile_Invalid))
+	tmpfile := makeFakeVmStatFile([]byte(vmStatFile_Invalid))
 	defer os.Remove(tmpfile)
 
 	k := KernelVmstat{
@@ -164,7 +164,7 @@ func TestInvalidVmStatProcFile1(t *testing.T) {
 }
 
 func TestNoVmStatProcFile(t *testing.T) {
-	tmpfile := makeFakeStatFile([]byte(vmStatFile_Invalid))
+	tmpfile := makeFakeVmStatFile([]byte(vmStatFile_Invalid))
 	os.Remove(tmpfile)
 
 	k := KernelVmstat{

plugins/inputs/linux_sysctl_fs/linux_sysctl_fs.go

@@ -1,4 +1,4 @@
-package system
+package linux_sysctl_fs
 
 import (
 	"bytes"

plugins/inputs/linux_sysctl_fs/linux_sysctl_fs_test.go

@@ -1,4 +1,4 @@
-package system
+package linux_sysctl_fs
 
 import (
 	"io/ioutil"

plugins/inputs/mem/memory.go

@@ -1,14 +1,15 @@
-package system
+package mem
 
 import (
 	"fmt"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 type MemStats struct {
-	ps PS
+	ps system.PS
 }
 
 func (_ *MemStats) Description() string {
@@ -43,7 +44,7 @@ func (s *MemStats) Gather(acc telegraf.Accumulator) error {
 }
 
 func init() {
-	ps := newSystemPS()
+	ps := system.NewSystemPS()
 	inputs.Add("mem", func() telegraf.Input {
 		return &MemStats{ps: ps}
 	})

plugins/inputs/mem/memory_test.go

@@ -1,15 +1,16 @@
-package system
+package mem
 
 import (
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/mem"
 	"github.com/stretchr/testify/require"
 )
 
 func TestMemStats(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	var err error
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator

plugins/inputs/net/NETSTAT_README.md

@@ -1,10 +1,18 @@
-Telegraf plugin: NETSTAT
+# Netstat Input Plugin
 
-#### Description
+This plugin collects TCP connections state and UDP socket counts by using `lsof`.
 
-The NETSTAT plugin collects TCP connections state and UDP socket counts by using `lsof`.
+### Configuration:
 
-Supported TCP Connection states are follows. 
+``` toml
+# Collect TCP connections state and UDP socket counts
+[[inputs.netstat]]
+  # no configuration
+```
+
+# Measurements:
+
+Supported TCP Connection states are follows.
 
 - established
 - syn_sent
@@ -19,8 +27,6 @@ Supported TCP Connection states are follows.
 - closing
 - none
 
-
-# Measurements:
 ### TCP Connection State measurements:
 
 Meta:
@@ -49,4 +55,3 @@ Meta:
 
 Measurement names:
 - udp_socket
-

plugins/inputs/net/net.go

@@ -1,4 +1,4 @@
-package system
+package net
 
 import (
 	"fmt"
@@ -8,11 +8,12 @@ import (
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/filter"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 type NetIOStats struct {
 	filter filter.Filter
-	ps     PS
+	ps     system.PS
 
 	skipChecks          bool
 	IgnoreProtocolStats bool
@@ -119,6 +120,6 @@ func (s *NetIOStats) Gather(acc telegraf.Accumulator) error {
 
 func init() {
 	inputs.Add("net", func() telegraf.Input {
-		return &NetIOStats{ps: newSystemPS()}
+		return &NetIOStats{ps: system.NewSystemPS()}
 	})
 }

plugins/inputs/net/net_test.go

@@ -1,16 +1,17 @@
-package system
+package net
 
 import (
 	"syscall"
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/net"
 	"github.com/stretchr/testify/require"
 )
 
 func TestNetStats(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	var err error
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator

plugins/inputs/net/netstat.go

@@ -1,4 +1,4 @@
-package system
+package net
 
 import (
 	"fmt"
@@ -6,10 +6,11 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 type NetStats struct {
-	ps PS
+	ps system.PS
 }
 
 func (_ *NetStats) Description() string {
@@ -66,6 +67,6 @@ func (s *NetStats) Gather(acc telegraf.Accumulator) error {
 
 func init() {
 	inputs.Add("netstat", func() telegraf.Input {
-		return &NetStats{ps: newSystemPS()}
+		return &NetStats{ps: system.NewSystemPS()}
 	})
 }

plugins/inputs/processes/processes.go

@@ -1,6 +1,6 @@
 // +build !windows
 
-package system
+package processes
 
 import (
 	"bytes"
@@ -16,6 +16,7 @@ import (
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/linux_sysctl_fs"
 )
 
 type Processes struct {
@@ -133,7 +134,7 @@ func (p *Processes) gatherFromPS(fields map[string]interface{}) error {
 
 // get process states from /proc/(pid)/stat files
 func (p *Processes) gatherFromProc(fields map[string]interface{}) error {
-	filenames, err := filepath.Glob(GetHostProc() + "/[0-9]*/stat")
+	filenames, err := filepath.Glob(linux_sysctl_fs.GetHostProc() + "/[0-9]*/stat")
 
 	if err != nil {
 		return err

plugins/inputs/processes/processes_test.go

@@ -1,4 +1,6 @@
-package system
+// +build !windows
+
+package processes
 
 import (
 	"fmt"

plugins/inputs/processes/processes_windows.go

@@ -0,0 +1,3 @@
+// +build windows
+
+package processes

plugins/inputs/swap/swap.go

@@ -1,14 +1,15 @@
-package system
+package swap
 
 import (
 	"fmt"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 )
 
 type SwapStats struct {
-	ps PS
+	ps system.PS
 }
 
 func (_ *SwapStats) Description() string {
@@ -40,7 +41,7 @@ func (s *SwapStats) Gather(acc telegraf.Accumulator) error {
 }
 
 func init() {
-	ps := newSystemPS()
+	ps := system.NewSystemPS()
 	inputs.Add("swap", func() telegraf.Input {
 		return &SwapStats{ps: ps}
 	})

plugins/inputs/swap/swap_test.go

@@ -1,15 +1,16 @@
-package system
+package swap
 
 import (
 	"testing"
 
+	"github.com/influxdata/telegraf/plugins/inputs/system"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/shirou/gopsutil/mem"
 	"github.com/stretchr/testify/require"
 )
 
 func TestSwapStats(t *testing.T) {
-	var mps MockPS
+	var mps system.MockPS
 	var err error
 	defer mps.AssertExpectations(t)
 	var acc testutil.Accumulator

plugins/inputs/system/mock_PS.go

@@ -19,11 +19,11 @@ type MockPS struct {
 }
 
 type MockPSDisk struct {
-	*systemPS
+	*SystemPS
 	*mock.Mock
 }
 
-type mockDiskUsage struct {
+type MockDiskUsage struct {
 	*mock.Mock
 }
 
@@ -109,7 +109,7 @@ func (m *MockPS) NetConnections() ([]net.ConnectionStat, error) {
 	return r0, r1
 }
 
-func (m *mockDiskUsage) Partitions(all bool) ([]disk.PartitionStat, error) {
+func (m *MockDiskUsage) Partitions(all bool) ([]disk.PartitionStat, error) {
 	ret := m.Called(all)
 
 	r0 := ret.Get(0).([]disk.PartitionStat)
@@ -118,12 +118,12 @@ func (m *mockDiskUsage) Partitions(all bool) ([]disk.PartitionStat, error) {
 	return r0, r1
 }
 
-func (m *mockDiskUsage) OSGetenv(key string) string {
+func (m *MockDiskUsage) OSGetenv(key string) string {
 	ret := m.Called(key)
 	return ret.Get(0).(string)
 }
 
-func (m *mockDiskUsage) OSStat(name string) (os.FileInfo, error) {
+func (m *MockDiskUsage) OSStat(name string) (os.FileInfo, error) {
 	ret := m.Called(name)
 
 	r0 := ret.Get(0).(os.FileInfo)
@@ -132,7 +132,7 @@ func (m *mockDiskUsage) OSStat(name string) (os.FileInfo, error) {
 	return r0, r1
 }
 
-func (m *mockDiskUsage) PSDiskUsage(path string) (*disk.UsageStat, error) {
+func (m *MockDiskUsage) PSDiskUsage(path string) (*disk.UsageStat, error) {
 	ret := m.Called(path)
 
 	r0 := ret.Get(0).(*disk.UsageStat)

plugins/inputs/system/ps.go

@@ -39,17 +39,17 @@ func add(acc telegraf.Accumulator,
 	}
 }
 
-func newSystemPS() *systemPS {
+func NewSystemPS() *SystemPS {
-	return &systemPS{&systemPSDisk{}}
+	return &SystemPS{&SystemPSDisk{}}
 }
 
-type systemPS struct {
+type SystemPS struct {
 	PSDiskDeps
 }
 
-type systemPSDisk struct{}
+type SystemPSDisk struct{}
 
-func (s *systemPS) CPUTimes(perCPU, totalCPU bool) ([]cpu.TimesStat, error) {
+func (s *SystemPS) CPUTimes(perCPU, totalCPU bool) ([]cpu.TimesStat, error) {
 	var cpuTimes []cpu.TimesStat
 	if perCPU {
 		if perCPUTimes, err := cpu.Times(true); err == nil {
@@ -68,7 +68,7 @@ func (s *systemPS) CPUTimes(perCPU, totalCPU bool) ([]cpu.TimesStat, error) {
 	return cpuTimes, nil
 }
 
-func (s *systemPS) DiskUsage(
+func (s *SystemPS) DiskUsage(
 	mountPointFilter []string,
 	fstypeExclude []string,
 ) ([]*disk.UsageStat, []*disk.PartitionStat, error) {
@@ -139,19 +139,19 @@ func (s *systemPS) DiskUsage(
 	return usage, partitions, nil
 }
 
-func (s *systemPS) NetProto() ([]net.ProtoCountersStat, error) {
+func (s *SystemPS) NetProto() ([]net.ProtoCountersStat, error) {
 	return net.ProtoCounters(nil)
 }
 
-func (s *systemPS) NetIO() ([]net.IOCountersStat, error) {
+func (s *SystemPS) NetIO() ([]net.IOCountersStat, error) {
 	return net.IOCounters(true)
 }
 
-func (s *systemPS) NetConnections() ([]net.ConnectionStat, error) {
+func (s *SystemPS) NetConnections() ([]net.ConnectionStat, error) {
 	return net.Connections("all")
 }
 
-func (s *systemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error) {
+func (s *SystemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error) {
 	m, err := disk.IOCounters(names...)
 	if err == internal.NotImplementedError {
 		return nil, nil
@@ -160,26 +160,26 @@ func (s *systemPS) DiskIO(names []string) (map[string]disk.IOCountersStat, error
 	return m, err
 }
 
-func (s *systemPS) VMStat() (*mem.VirtualMemoryStat, error) {
+func (s *SystemPS) VMStat() (*mem.VirtualMemoryStat, error) {
 	return mem.VirtualMemory()
 }
 
-func (s *systemPS) SwapStat() (*mem.SwapMemoryStat, error) {
+func (s *SystemPS) SwapStat() (*mem.SwapMemoryStat, error) {
 	return mem.SwapMemory()
 }
 
-func (s *systemPSDisk) Partitions(all bool) ([]disk.PartitionStat, error) {
+func (s *SystemPSDisk) Partitions(all bool) ([]disk.PartitionStat, error) {
 	return disk.Partitions(all)
 }
 
-func (s *systemPSDisk) OSGetenv(key string) string {
+func (s *SystemPSDisk) OSGetenv(key string) string {
 	return os.Getenv(key)
 }
 
-func (s *systemPSDisk) OSStat(name string) (os.FileInfo, error) {
+func (s *SystemPSDisk) OSStat(name string) (os.FileInfo, error) {
 	return os.Stat(name)
 }
 
-func (s *systemPSDisk) PSDiskUsage(path string) (*disk.UsageStat, error) {
+func (s *SystemPSDisk) PSDiskUsage(path string) (*disk.UsageStat, error) {
 	return disk.Usage(path)
 }