Breakup the system plugin

plugins/system/memory.go

@@ -0,0 +1,78 @@
+package system
+
+import (
+	"fmt"
+
+	"github.com/influxdb/tivan/plugins"
+)
+
+type MemStats struct {
+	ps PS
+}
+
+func (_ *MemStats) Description() string {
+	return "Read metrics about memory usage"
+}
+
+func (_ *MemStats) SampleConfig() string { return "" }
+
+func (s *MemStats) Gather(acc plugins.Accumulator) error {
+	vm, err := s.ps.VMStat()
+	if err != nil {
+		return fmt.Errorf("error getting virtual memory info: %s", err)
+	}
+
+	vmtags := map[string]string(nil)
+
+	acc.Add("total", vm.Total, vmtags)
+	acc.Add("available", vm.Available, vmtags)
+	acc.Add("used", vm.Used, vmtags)
+	acc.Add("used_prec", vm.UsedPercent, vmtags)
+	acc.Add("free", vm.Free, vmtags)
+	acc.Add("active", vm.Active, vmtags)
+	acc.Add("inactive", vm.Inactive, vmtags)
+	acc.Add("buffers", vm.Buffers, vmtags)
+	acc.Add("cached", vm.Cached, vmtags)
+	acc.Add("wired", vm.Wired, vmtags)
+	acc.Add("shared", vm.Shared, vmtags)
+
+	return nil
+}
+
+type SwapStats struct {
+	ps PS
+}
+
+func (_ *SwapStats) Description() string {
+	return "Read metrics about swap memory usage"
+}
+
+func (_ *SwapStats) SampleConfig() string { return "" }
+
+func (s *SwapStats) Gather(acc plugins.Accumulator) error {
+	swap, err := s.ps.SwapStat()
+	if err != nil {
+		return fmt.Errorf("error getting swap memory info: %s", err)
+	}
+
+	swaptags := map[string]string(nil)
+
+	acc.Add("total", swap.Total, swaptags)
+	acc.Add("used", swap.Used, swaptags)
+	acc.Add("free", swap.Free, swaptags)
+	acc.Add("used_perc", swap.UsedPercent, swaptags)
+	acc.Add("in", swap.Sin, swaptags)
+	acc.Add("out", swap.Sout, swaptags)
+
+	return nil
+}
+
+func init() {
+	plugins.Add("mem", func() plugins.Plugin {
+		return &MemStats{ps: &systemPS{}}
+	})
+
+	plugins.Add("swap", func() plugins.Plugin {
+		return &SwapStats{ps: &systemPS{}}
+	})
+}