Initial QSfera import

Server/vendor/github.com/lufia/plan9stats/stats.go

@@ -0,0 +1,88 @@
+package stats
+
+import (
+	"bufio"
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type InterfaceStats struct {
+	PacketsReceived  int64 // in packets
+	Link             int   // link status
+	PacketsSent      int64 // out packets
+	NumCRCErr        int   // input CRC errors
+	NumOverflows     int   // packet overflows
+	NumSoftOverflows int   // software overflow
+	NumFramingErr    int   // framing errors
+	NumBufferingErr  int   // buffering errors
+	NumOutputErr     int   // output errors
+	Promiscuous      int   // number of promiscuous opens
+	Mbps             int   // megabits per sec
+	Addr             string
+}
+
+func ReadInterfaceStats(ctx context.Context, opts ...Option) (*InterfaceStats, error) {
+	cfg := newConfig(opts...)
+	file := filepath.Join(cfg.rootdir, "stats")
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var stats InterfaceStats
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		s := strings.TrimSpace(scanner.Text())
+		a := strings.SplitN(s, ":", 2)
+		if len(a) != 2 {
+			continue
+		}
+		var p intParser
+		v := strings.TrimSpace(a[1])
+		switch a[0] {
+		case "in":
+			stats.PacketsReceived = p.ParseInt64(v, 10)
+		case "link":
+			stats.Link = p.ParseInt(v, 10)
+		case "out":
+			stats.PacketsSent = p.ParseInt64(v, 10)
+		case "crc":
+			stats.NumCRCErr = p.ParseInt(v, 10)
+		case "overflows":
+			stats.NumOverflows = p.ParseInt(v, 10)
+		case "soft overflows":
+			stats.NumSoftOverflows = p.ParseInt(v, 10)
+		case "framing errs":
+			stats.NumFramingErr = p.ParseInt(v, 10)
+		case "buffer errs":
+			stats.NumBufferingErr = p.ParseInt(v, 10)
+		case "output errs":
+			stats.NumOutputErr = p.ParseInt(v, 10)
+		case "prom":
+			stats.Promiscuous = p.ParseInt(v, 10)
+		case "mbps":
+			stats.Mbps = p.ParseInt(v, 10)
+		case "addr":
+			stats.Addr = v
+		}
+		if err := p.Err(); err != nil {
+			return nil, err
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+	return &stats, nil
+}
+
+type TCPStats struct {
+	MaxConn            int
+	MaxSegment         int
+	ActiveOpens        int
+	PassiveOpens       int
+	EstablishedResets  int
+	CurrentEstablished int
+}