added load average calculations and moved the testing from main to their own cli commands

internal/load_average/linux_loadavg.go

@@ -0,0 +1,55 @@
+//go:build linux
+
+package loadaverage
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func getLinuxLoadAverage() (LoadAverageInformation, error) {
+	loadFile, err := os.Open("/proc/loadavg")
+	if err != nil {
+		return LoadAverageInformation{}, fmt.Errorf("Could not find /proc/loadavg. Are you sure you are on linux?")
+	}
+	defer loadFile.Close()
+
+	fileReader := bufio.NewScanner(loadFile)
+
+	var one_m float64
+	var five_m float64
+	var fifteen_m float64
+
+	fileReader.Scan()
+	if fileReader.Err() != nil {
+		return LoadAverageInformation{}, fmt.Errorf("Could not read /proc/uptime.")
+	}
+
+	data := fileReader.Text()
+
+	/*
+	 * fields[0] One minute load average
+	 * fields[1] Five minute load average
+	 * fields[2] Fifteen minute load average
+	 * fields[3] Currently executing/total scheduled
+	 * fields[4] Most recent process PID
+	 */
+	fields := strings.Split(data, " ")
+
+	one_m, _ = strconv.ParseFloat(fields[0], 64)
+	five_m, _ = strconv.ParseFloat(fields[1], 64)
+	fifteen_m, _ = strconv.ParseFloat(fields[2], 64)
+
+	return LoadAverageInformation{
+		Load1:  one_m,
+		Load5:  five_m,
+		Load15: fifteen_m,
+	}, nil
+}
+
+func GetLoadAverage() (LoadAverageInformation, error) {
+	return getLinuxLoadAverage()
+}