Create public models for telegraf metrics, accumlator, plugins

This will basically make the root directory a place for storing the
major telegraf interfaces, which will make telegraf's godoc looks quite
a bit nicer. And make it easier for contributors to lookup the few data
types that they actually care about.

closes #564

plugins/inputs/system/cpu.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 	"github.com/shirou/gopsutil/cpu"
 )
@@ -39,7 +40,7 @@ func (_ *CPUStats) SampleConfig() string {
 	return sampleConfig
 }
 
-func (s *CPUStats) Gather(acc inputs.Accumulator) error {
+func (s *CPUStats) Gather(acc telegraf.Accumulator) error {
 	times, err := s.ps.CPUTimes(s.PerCPU, s.TotalCPU)
 	if err != nil {
 		return fmt.Errorf("error getting CPU info: %s", err)
@@ -111,7 +112,7 @@ func totalCpuTime(t cpu.CPUTimesStat) float64 {
 }
 
 func init() {
-	inputs.Add("cpu", func() inputs.Input {
+	inputs.Add("cpu", func() telegraf.Input {
 		return &CPUStats{ps: &systemPS{}}
 	})
 }

plugins/inputs/system/disk.go

@@ -3,6 +3,7 @@ package system
 import (
 	"fmt"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -29,7 +30,7 @@ func (_ *DiskStats) SampleConfig() string {
 	return diskSampleConfig
 }
 
-func (s *DiskStats) Gather(acc inputs.Accumulator) error {
+func (s *DiskStats) Gather(acc telegraf.Accumulator) error {
 	// Legacy support:
 	if len(s.Mountpoints) != 0 {
 		s.MountPoints = s.Mountpoints
@@ -90,7 +91,7 @@ func (_ *DiskIOStats) SampleConfig() string {
 	return diskIoSampleConfig
 }
 
-func (s *DiskIOStats) Gather(acc inputs.Accumulator) error {
+func (s *DiskIOStats) Gather(acc telegraf.Accumulator) error {
 	diskio, err := s.ps.DiskIO()
 	if err != nil {
 		return fmt.Errorf("error getting disk io info: %s", err)
@@ -136,11 +137,11 @@ func (s *DiskIOStats) Gather(acc inputs.Accumulator) error {
 }
 
 func init() {
-	inputs.Add("disk", func() inputs.Input {
+	inputs.Add("disk", func() telegraf.Input {
 		return &DiskStats{ps: &systemPS{}}
 	})
 
-	inputs.Add("diskio", func() inputs.Input {
+	inputs.Add("diskio", func() telegraf.Input {
 		return &DiskIOStats{ps: &systemPS{}}
 	})
 }

plugins/inputs/system/memory.go

@@ -3,6 +3,7 @@ package system
 import (
 	"fmt"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -16,7 +17,7 @@ func (_ *MemStats) Description() string {
 
 func (_ *MemStats) SampleConfig() string { return "" }
 
-func (s *MemStats) Gather(acc inputs.Accumulator) error {
+func (s *MemStats) Gather(acc telegraf.Accumulator) error {
 	vm, err := s.ps.VMStat()
 	if err != nil {
 		return fmt.Errorf("error getting virtual memory info: %s", err)
@@ -47,7 +48,7 @@ func (_ *SwapStats) Description() string {
 
 func (_ *SwapStats) SampleConfig() string { return "" }
 
-func (s *SwapStats) Gather(acc inputs.Accumulator) error {
+func (s *SwapStats) Gather(acc telegraf.Accumulator) error {
 	swap, err := s.ps.SwapStat()
 	if err != nil {
 		return fmt.Errorf("error getting swap memory info: %s", err)
@@ -67,11 +68,11 @@ func (s *SwapStats) Gather(acc inputs.Accumulator) error {
 }
 
 func init() {
-	inputs.Add("mem", func() inputs.Input {
+	inputs.Add("mem", func() telegraf.Input {
 		return &MemStats{ps: &systemPS{}}
 	})
 
-	inputs.Add("swap", func() inputs.Input {
+	inputs.Add("swap", func() telegraf.Input {
 		return &SwapStats{ps: &systemPS{}}
 	})
 }

plugins/inputs/system/net.go

@@ -5,6 +5,7 @@ import (
 	"net"
 	"strings"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -31,7 +32,7 @@ func (_ *NetIOStats) SampleConfig() string {
 	return netSampleConfig
 }
 
-func (s *NetIOStats) Gather(acc inputs.Accumulator) error {
+func (s *NetIOStats) Gather(acc telegraf.Accumulator) error {
 	netio, err := s.ps.NetIO()
 	if err != nil {
 		return fmt.Errorf("error getting net io info: %s", err)
@@ -103,7 +104,7 @@ func (s *NetIOStats) Gather(acc inputs.Accumulator) error {
 }
 
 func init() {
-	inputs.Add("net", func() inputs.Input {
+	inputs.Add("net", func() telegraf.Input {
 		return &NetIOStats{ps: &systemPS{}}
 	})
 }

plugins/inputs/system/netstat.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"syscall"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -21,7 +22,7 @@ func (_ *NetStats) SampleConfig() string {
 	return tcpstatSampleConfig
 }
 
-func (s *NetStats) Gather(acc inputs.Accumulator) error {
+func (s *NetStats) Gather(acc telegraf.Accumulator) error {
 	netconns, err := s.ps.NetConnections()
 	if err != nil {
 		return fmt.Errorf("error getting net connections info: %s", err)
@@ -64,7 +65,7 @@ func (s *NetStats) Gather(acc inputs.Accumulator) error {
 }
 
 func init() {
-	inputs.Add("netstat", func() inputs.Input {
+	inputs.Add("netstat", func() telegraf.Input {
 		return &NetStats{ps: &systemPS{}}
 	})
 }

plugins/inputs/system/ps.go

@@ -3,8 +3,8 @@ package system
 import (
 	"os"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal"
-	"github.com/influxdata/telegraf/plugins/inputs"
 
 	"github.com/shirou/gopsutil/cpu"
 	"github.com/shirou/gopsutil/disk"
@@ -23,7 +23,7 @@ type PS interface {
 	NetConnections() ([]net.NetConnectionStat, error)
 }
 
-func add(acc inputs.Accumulator,
+func add(acc telegraf.Accumulator,
 	name string, val float64, tags map[string]string) {
 	if val >= 0 {
 		acc.Add(name, val, tags)

plugins/inputs/system/system.go

@@ -8,6 +8,7 @@ import (
 	"github.com/shirou/gopsutil/host"
 	"github.com/shirou/gopsutil/load"
 
+	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -19,7 +20,7 @@ func (_ *SystemStats) Description() string {
 
 func (_ *SystemStats) SampleConfig() string { return "" }
 
-func (_ *SystemStats) Gather(acc inputs.Accumulator) error {
+func (_ *SystemStats) Gather(acc telegraf.Accumulator) error {
 	loadavg, err := load.LoadAvg()
 	if err != nil {
 		return err
@@ -68,7 +69,7 @@ func format_uptime(uptime uint64) string {
 }
 
 func init() {
-	inputs.Add("system", func() inputs.Input {
+	inputs.Add("system", func() telegraf.Input {
 		return &SystemStats{}
 	})
 }