Replaces the Prometheus client with VictoriaMetrics/metrics

13 files changed, 114 insertions, 300 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 316e451..318c4f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Extensions are now built with a build tool; this is an interim solution until issues with the Go plugin API are resolved.
 - Command line help text is cleaned up.
 - Version bump of gopsutil
+- Prometheus client replaced by [VictoriaMetrics/metrics](https://github.com/VictoriaMetrics/metrics). This eliminated 6 indirect package dependencies and saved 3.5MB (25%) of the compiled binary size.
 
 ### Removed
 
diff --git a/README.md b/README.md
index 8a3e55e..4d3e571 100644
--- a/README.md
+++ b/README.md
@@ -229,6 +229,7 @@ Run `gotop -h` to see the list of all command line options.
 - [shirou/gopsutil](https://github.com/shirou/gopsutil)
 - [goreleaser/nfpm](https://github.com/goreleaser/nfpm)
 - [distatus/battery](https://github.com/distatus/battery)
+- [VictoriaMetrics/metrics](https://github.com/VictoriaMetrics/metrics) Check this out! The API is clean, elegant, introduces many fewer indirect dependencies than the Prometheus client, and adds 50% less size to binaries.
 
 ## History
 
diff --git a/cmd/gotop/main.go b/cmd/gotop/main.go
index 25dd5b8..dc869ce 100644
--- a/cmd/gotop/main.go
+++ b/cmd/gotop/main.go
@@ -17,8 +17,8 @@ import (
 
 	//_ "net/http/pprof"
 
+	"github.com/VictoriaMetrics/metrics"
 	ui "github.com/gizak/termui/v3"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/shibukawa/configdir"
 	"github.com/xxxserxxx/opflag"
 
@@ -447,7 +447,9 @@ func run() int {
 
 	if conf.ExportPort != "" {
 		go func() {
-			http.Handle("/metrics", promhttp.Handler())
+			http.HandleFunc("/metrics", func(w http.ResponseWriter, req *http.Request) {
+				metrics.WritePrometheus(w, true)
+			})
 			http.ListenAndServe(conf.ExportPort, nil)
 		}()
 	}
diff --git a/go.mod b/go.mod
index 975ca3d..1763e3d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,25 +1,19 @@
 module github.com/xxxserxxx/gotop/v4
 
 require (
-	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
+	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
+	github.com/VictoriaMetrics/metrics v1.11.2
 	github.com/distatus/battery v0.9.0
-	github.com/docopt/docopt.go v0.0.0-20180111231733-ee0de3bc6815
 	github.com/gizak/termui/v3 v3.0.0
-	github.com/go-ole/go-ole v1.2.1 // indirect
+	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/mattn/go-runewidth v0.0.4
-	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
-	github.com/prometheus/client_golang v1.4.1
 	github.com/shibukawa/configdir v0.0.0-20170330084843-e180dbdc8da0
 	github.com/shirou/gopsutil v2.20.3+incompatible
-	github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
 	github.com/stretchr/testify v1.4.0
 	github.com/xxxserxxx/iSMC v1.0.1
 	github.com/xxxserxxx/opflag v1.0.5
-	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a // indirect
-	golang.org/x/tools v0.0.0-20200425043458-8463f397d07c // indirect
-	golang.org/x/tools/gopls v0.4.0 // indirect
-	howett.net/plist v0.0.0-20181124034731-591f970eefbb // indirect
-	mvdan.cc/xurls/v2 v2.2.0 // indirect
+	golang.org/x/sys v0.0.0-20200511232937-7e40ca221e25 // indirect
+	howett.net/plist v0.0.0-20200419221736-3b63eb3a43b5 // indirect
 )
 
 go 1.14
diff --git a/go.sum b/go.sum
index 2e2c454..d698b71 100644
--- a/go.sum
+++ b/go.sum
@@ -1,52 +1,18 @@
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-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
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@@ -55,134 +21,38 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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 github.com/xxxserxxx/iSMC v1.0.1/go.mod h1:TGgNjU7BF2DZSuxiTft+BdzxzcujFJYqFfMCzcTl/aY=
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 github.com/xxxserxxx/opflag v1.0.5/go.mod h1:GWZtb3/tGGj5W1GE/JTyJAuqgxDxl1+jqDGAGM+P/p4=
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 golang.org/x/arch v0.0.0-20181203225421-5a4828bb7045/go.mod h1:cYlCBUl1MsqxdiKgmc4uh7TxZfWSFLOGSRR090WDxt8=
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-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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-mvdan.cc/xurls/v2 v2.1.0/go.mod h1:5GrSd9rOnKOpZaji1OZLYL/yeAAtGDlo/cFe+8K5n8E=
-mvdan.cc/xurls/v2 v2.2.0 h1:NSZPykBXJFCetGZykLAxaL6SIpvbVy/UFEniIfHAa8A=
-mvdan.cc/xurls/v2 v2.2.0/go.mod h1:EV1RMtya9D6G5DMYPGD8zTQzaHet6Jh8gFlRgGRJeO8=
+howett.net/plist v0.0.0-20200419221736-3b63eb3a43b5 h1:AQkaJpH+/FmqRjmXZPELom5zIERYZfwTjnHpfoVMQEc=
+howett.net/plist v0.0.0-20200419221736-3b63eb3a43b5/go.mod h1:vMygbs4qMhSZSc4lCUl2OEE+rDiIIJAIdR4m7MiMcm0=
diff --git a/widgets/battery.go b/widgets/battery.go
index 7167668..77b102f 100644
--- a/widgets/battery.go
+++ b/widgets/battery.go
@@ -7,8 +7,8 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/VictoriaMetrics/metrics"
 	"github.com/distatus/battery"
-	"github.com/prometheus/client_golang/prometheus"
 
 	ui "github.com/xxxserxxx/gotop/v4/termui"
 )
@@ -16,7 +16,6 @@ import (
 type BatteryWidget struct {
 	*ui.LineGraph
 	updateInterval time.Duration
-	metric         []prometheus.Gauge
 }
 
 func NewBatteryWidget(horizontalScale int) *BatteryWidget {
@@ -49,16 +48,14 @@ func (b *BatteryWidget) EnableMetric() {
 		log.Printf("error setting up metrics: %v", err)
 		return
 	}
-	b.metric = make([]prometheus.Gauge, len(bats))
-	for i, bat := range bats {
-		gauge := prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "gotop",
-			Subsystem: "battery",
-			Name:      fmt.Sprintf("%d", i),
+	for i, _ := range bats {
+		id := makeID(i)
+		metrics.NewGauge(makeName("battery", i), func() float64 {
+			if ds, ok := b.Data[id]; ok {
+				return ds[len(ds)-1]
+			}
+			return 0.0
 		})
-		gauge.Set(bat.Current / bat.Full)
-		b.metric[i] = gauge
-		prometheus.MustRegister(gauge)
 	}
 }
 
@@ -97,10 +94,8 @@ func (b *BatteryWidget) update() {
 		id := makeID(i)
 		perc := battery.Current / battery.Full
 		percentFull := math.Abs(perc) * 100.0
+		// TODO: look into this sort of thing; doesn't the array grow forever? Is the widget library truncating it?
 		b.Data[id] = append(b.Data[id], percentFull)
 		b.Labels[id] = fmt.Sprintf("%3.0f%% %.0f/%.0f", percentFull, math.Abs(battery.Current), math.Abs(battery.Full))
-		if b.metric != nil {
-			b.metric[i].Set(perc)
-		}
 	}
 }
diff --git a/widgets/batterygauge.go b/widgets/batterygauge.go
index 45fec1c..3a89707 100644
--- a/widgets/batterygauge.go
+++ b/widgets/batterygauge.go
@@ -6,15 +6,15 @@ import (
 
 	"time"
 
+	"github.com/VictoriaMetrics/metrics"
 	"github.com/distatus/battery"
-	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/xxxserxxx/gotop/v4/termui"
 )
 
 type BatteryGauge struct {
 	*termui.Gauge
-	metric prometheus.Gauge
+	metric *metrics.Gauge
 }
 
 func NewBatteryGauge() *BatteryGauge {
@@ -35,25 +35,9 @@ func NewBatteryGauge() *BatteryGauge {
 }
 
 func (b *BatteryGauge) EnableMetric() {
-	bats, err := battery.GetAll()
-	if err != nil {
-		log.Printf("error setting up metrics: %v", err)
-		return
-	}
-	mx := 0.0
-	cu := 0.0
-	for _, bat := range bats {
-		mx += bat.Full
-		cu += bat.Current
-		gauge := prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "gotop",
-			Subsystem: "battery",
-			Name:      "total",
-		})
-		gauge.Set(cu / mx)
-		b.metric = gauge
-		prometheus.MustRegister(gauge)
-	}
+	metrics.NewGauge(makeName("battery", "total"), func() float64 {
+		return float64(b.Percent)
+	})
 }
 
 func (b *BatteryGauge) update() {
@@ -80,7 +64,4 @@ func (b *BatteryGauge) update() {
 	d, _ := time.ParseDuration(fmt.Sprintf("%fh", tn))
 	b.Percent = int((cu / mx) * 100.0)
 	b.Label = fmt.Sprintf(charging, b.Percent, d.Truncate(time.Minute))
-	if b.metric != nil {
-		b.metric.Set(cu / mx)
-	}
 }
diff --git a/widgets/cpu.go b/widgets/cpu.go
index 03346bf..d8d9a50 100644
--- a/widgets/cpu.go
+++ b/widgets/cpu.go
@@ -2,11 +2,10 @@ package widgets
 
 import (
 	"fmt"
-	"log"
 	"sync"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"github.com/VictoriaMetrics/metrics"
 	"github.com/xxxserxxx/gotop/v4/devices"
 
 	ui "github.com/xxxserxxx/gotop/v4/termui"
@@ -19,7 +18,7 @@ type CPUWidget struct {
 	ShowPerCPULoad  bool
 	updateInterval  time.Duration
 	updateLock      sync.Mutex
-	metric          map[string]prometheus.Gauge
+	cpuLoads        map[string]float64
 }
 
 var cpuLabels []string
@@ -31,6 +30,7 @@ func NewCPUWidget(updateInterval time.Duration, horizontalScale int, showAverage
 		updateInterval:  updateInterval,
 		ShowAverageLoad: showAverageLoad,
 		ShowPerCPULoad:  showPerCPULoad,
+		cpuLoads:        make(map[string]float64),
 	}
 	self.Title = " CPU Usage "
 	self.HorizontalScale = horizontalScale
@@ -66,26 +66,22 @@ func NewCPUWidget(updateInterval time.Duration, horizontalScale int, showAverage
 	return self
 }
 
+const AVRG = "AVRG"
+
 func (cpu *CPUWidget) EnableMetric() {
 	if cpu.ShowAverageLoad {
-		cpu.metric = make(map[string]prometheus.Gauge)
-		cpu.metric["AVRG"] = prometheus.NewGauge(prometheus.GaugeOpts{
-			Subsystem: "cpu",
-			Name:      "avg",
+		metrics.NewGauge(makeName("cpu", " avg"), func() float64 {
+			return cpu.cpuLoads[AVRG]
 		})
 	} else {
 		cpus := make(map[string]int)
 		devices.UpdateCPU(cpus, cpu.updateInterval, cpu.ShowPerCPULoad)
-		cpu.metric = make(map[string]prometheus.Gauge)
 		for key, perc := range cpus {
-			gauge := prometheus.NewGauge(prometheus.GaugeOpts{
-				Namespace: "gotop",
-				Subsystem: "cpu",
-				Name:      key,
+			kc := key
+			cpu.cpuLoads[key] = float64(perc)
+			metrics.NewGauge(makeName("cpu", key), func() float64 {
+				return cpu.cpuLoads[kc]
 			})
-			gauge.Set(float64(perc))
-			prometheus.MustRegister(gauge)
-			cpu.metric[key] = gauge
 		}
 	}
 }
@@ -108,11 +104,9 @@ func (cpu *CPUWidget) update() {
 				val = float64(v)
 				break
 			}
-			cpu.Data["AVRG"] = append(cpu.Data["AVRG"], val)
-			cpu.Labels["AVRG"] = fmt.Sprintf("%3.0f%%", val)
-			if cpu.metric != nil {
-				cpu.metric["AVRG"].Set(val)
-			}
+			cpu.Data[AVRG] = append(cpu.Data[AVRG], val)
+			cpu.Labels[AVRG] = fmt.Sprintf("%3.0f%%", val)
+			cpu.cpuLoads[AVRG] = val
 		}()
 	}
 
@@ -127,13 +121,7 @@ func (cpu *CPUWidget) update() {
 			for key, percent := range cpus {
 				cpu.Data[key] = append(cpu.Data[key], float64(percent))
 				cpu.Labels[key] = fmt.Sprintf("%d%%", percent)
-				if cpu.metric != nil {
-					if cpu.metric[key] == nil {
-						log.Printf("no metrics for %s", key)
-					} else {
-						cpu.metric[key].Set(float64(percent))
-					}
-				}
+				cpu.cpuLoads[key] = float64(percent)
 			}
 		}()
 	}
diff --git a/widgets/disk.go b/widgets/disk.go
index fb77ace..dd49b9a 100644
--- a/widgets/disk.go
+++ b/widgets/disk.go
@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"github.com/VictoriaMetrics/metrics"
 	psDisk "github.com/shirou/gopsutil/disk"
 
 	ui "github.com/xxxserxxx/gotop/v4/termui"
@@ -29,7 +29,6 @@ type DiskWidget struct {
 	*ui.Table
 	updateInterval time.Duration
 	Partitions     map[string]*Partition
-	metric         map[string]prometheus.Gauge
 }
 
 // TODO: Add filtering
@@ -65,17 +64,11 @@ func NewDiskWidget() *DiskWidget {
 }
 
 func (disk *DiskWidget) EnableMetric() {
-	disk.metric = make(map[string]prometheus.Gauge)
 	for key, part := range disk.Partitions {
-		gauge := prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "gotop",
-			Subsystem: "disk",
-			Name:      strings.ReplaceAll(key, "/", ":"),
-			//Name:      strings.Replace(strings.Replace(part.Device, "/dev/", "", -1), "mapper/", "", -1),
+		pc := part
+		metrics.NewGauge(makeName("disk", strings.ReplaceAll(key, "/", ":")), func() float64 {
+			return float64(pc.UsedPercent) / 100.0
 		})
-		gauge.Set(float64(part.UsedPercent) / 100.0)
-		prometheus.MustRegister(gauge)
-		disk.metric[key] = gauge
 	}
 }
 
@@ -176,12 +169,5 @@ func (disk *DiskWidget) update() {
 		disk.Rows[i][3] = partition.Free
 		disk.Rows[i][4] = partition.BytesReadRecently
 		disk.Rows[i][5] = partition.BytesWrittenRecently
-		if disk.metric != nil {
-			if disk.metric[key] == nil {
-				log.Printf("ERROR: missing metric %s", key)
-			} else {
-				disk.metric[key].Set(float64(partition.UsedPercent) / 100.0)
-			}
-		}
 	}
 }
diff --git a/widgets/mem.go b/widgets/mem.go
index 6b5d326..b994276 100644
--- a/widgets/mem.go
+++ b/widgets/mem.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"github.com/VictoriaMetrics/metrics"
 
 	"github.com/xxxserxxx/gotop/v4/devices"
 	ui "github.com/xxxserxxx/gotop/v4/termui"
@@ -14,52 +14,47 @@ import (
 type MemWidget struct {
 	*ui.LineGraph
 	updateInterval time.Duration
-	metrics        map[string]prometheus.Gauge
 }
 
 func NewMemWidget(updateInterval time.Duration, horizontalScale int) *MemWidget {
-	self := &MemWidget{
+	widg := &MemWidget{
 		LineGraph:      ui.NewLineGraph(),
 		updateInterval: updateInterval,
 	}
-	self.Title = " Memory Usage "
-	self.HorizontalScale = horizontalScale
+	widg.Title = " Memory Usage "
+	widg.HorizontalScale = horizontalScale
 	mems := make(map[string]devices.MemoryInfo)
 	devices.UpdateMem(mems)
 	for name, mem := range mems {
-		self.Data[name] = []float64{0}
-		self.renderMemInfo(name, mem)
+		widg.Data[name] = []float64{0}
+		widg.renderMemInfo(name, mem)
 	}
 
 	go func() {
-		for range time.NewTicker(self.updateInterval).C {
-			self.Lock()
+		for range time.NewTicker(widg.updateInterval).C {
+			widg.Lock()
 			devices.UpdateMem(mems)
 			for label, mi := range mems {
-				self.renderMemInfo(label, mi)
-				if self.metrics != nil && self.metrics[label] != nil {
-					self.metrics[label].Set(mi.UsedPercent)
-				}
+				widg.renderMemInfo(label, mi)
 			}
-			self.Unlock()
+			widg.Unlock()
 		}
 	}()
 
-	return self
+	return widg
 }
 
 func (mem *MemWidget) EnableMetric() {
-	mem.metrics = make(map[string]prometheus.Gauge)
 	mems := make(map[string]devices.MemoryInfo)
 	devices.UpdateMem(mems)
-	for l, m := range mems {
-		mem.metrics[l] = prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: "gotop",
-			Subsystem: "memory",
-			Name:      l,
+	for l, _ := range mems {
+		lc := l
+		metrics.NewGauge(makeName("memory", l), func() float64 {
+			if ds, ok := mem.Data[lc]; ok {
+				return ds[len(ds)-1]
+			}
+			return 0.0
 		})
-		mem.metrics[l].Set(m.UsedPercent)
-		prometheus.MustRegister(mem.metrics[l])
 	}
 }
 
diff --git a/widgets/metrics.go b/widgets/metrics.go
new file mode 100644
index 0000000..683b196
--- /dev/null
+++ b/widgets/metrics.go
@@ -0,0 +1,19 @@
+package widgets
+
+import (
+	"fmt"
+	"strings"
+)
+
+// makeName creates a prometheus metric name in the gotop space
+// This function doesn't have to be very efficient because it's only
+// called at init time, and only a few dozen times... and it isn't
+// (very efficient).
+func makeName(parts ...interface{}) string {
+	args := make([]string, len(parts)+1)
+	args[0] = "gotop"
+	for i, v := range parts {
+		args[i+1] = fmt.Sprintf("%v", v)
+	}
+	return strings.Join(args, "_")
+}
diff --git a/widgets/net.go b/widgets/net.go
index 9cd4211..b76d6b4 100644
--- a/widgets/net.go
+++ b/widgets/net.go
@@ -6,7 +6,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
+	"github.com/VictoriaMetrics/metrics"
 	psNet "github.com/shirou/gopsutil/net"
 
 	ui "github.com/xxxserxxx/gotop/v4/termui"
@@ -28,8 +28,8 @@ type NetWidget struct {
 	totalBytesRecv uint64
 	totalBytesSent uint64
 	NetInterface   []string
-	sentMetric     prometheus.Counter
-	recvMetric     prometheus.Counter
+	sentMetric     *metrics.Counter
+	recvMetric     *metrics.Counter
 	Mbps           bool
 }
 
@@ -66,19 +66,8 @@ func NewNetWidget(netInterface string) *NetWidget {
 }
 
 func (net *NetWidget) EnableMetric() {
-	net.recvMetric = prometheus.NewCounter(prometheus.CounterOpts{
-		Namespace: "gotop",
-		Subsystem: "net",
-		Name:      "recv",
-	})
-	prometheus.MustRegister(net.recvMetric)
-
-	net.sentMetric = prometheus.NewCounter(prometheus.CounterOpts{
-		Namespace: "gotop",
-		Subsystem: "net",
-		Name:      "sent",
-	})
-	prometheus.MustRegister(net.sentMetric)
+	net.recvMetric = metrics.NewCounter(makeName("net", "recv"))
+	net.sentMetric = metrics.NewCounter(makeName("net", "sent"))
 }
 
 func (net *NetWidget) update() {
@@ -138,8 +127,8 @@ func (net *NetWidget) update() {
 		net.Lines[0].Data = append(net.Lines[0].Dat