[lbry] print out memory usage periodically

lbcd.go

@@ -150,6 +150,8 @@ func btcdMain(serverChan chan<- *server) error {
 
 	param.SetNetwork(activeNetParams.Params.Net) // prep the claimtrie params
 
+	go logMemoryUsage()
+
 	// Create server and start it.
 	server, err := newServer(cfg.Listeners, cfg.AgentBlacklist,
 		cfg.AgentWhitelist, db, activeNetParams.Params, interrupt)

resourceLogging.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/shirou/gopsutil/v3/disk"
+	"github.com/shirou/gopsutil/v3/mem"
+	"github.com/shirou/gopsutil/v3/process"
+
+	"os"
+	"path/filepath"
+	"time"
+)
+
+func toGB(n uint64) float64 {
+	return float64(n) / 1024.0 / 1024.0 / 1024.0
+}
+
+func dirSize(path string) (int64, error) {
+	var size int64
+	err := filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() {
+			size += info.Size()
+		}
+		return err
+	})
+	return size, err
+}
+
+func logMemoryUsage() {
+	last := ""
+	tick := time.NewTicker(40 * time.Second)
+	for range tick.C {
+		m, err := mem.VirtualMemory()
+		if err != nil {
+			btcdLog.Warnf("When reading memory size: %s", err.Error())
+			continue
+		}
+
+		d, err := disk.Usage(cfg.DataDir)
+		if err != nil {
+			btcdLog.Warnf("When reading disk usage: %s", err.Error())
+			continue
+		}
+
+		p, err := process.NewProcess(int32(os.Getpid()))
+		if err != nil {
+			btcdLog.Warnf("When reading process: %s", err.Error())
+			continue
+		}
+
+		m2, err := p.MemoryInfo()
+		if err != nil {
+			btcdLog.Warnf("When reading memory info: %s", err.Error())
+			continue
+		}
+
+		ds, err := dirSize(cfg.DataDir)
+		if err != nil {
+			btcdLog.Debugf("When reading directory: %s", err.Error())
+			continue
+		}
+
+		cur := fmt.Sprintf("RAM: using %.1f GB with %.1f available, DISK: using %.1f GB with %.1f available",
+			toGB(m2.RSS), toGB(m.Available), toGB(uint64(ds)), toGB(d.Free))
+		if cur != last {
+			btcdLog.Infof(cur)
+			last = cur
+		}
+	}
+}