collect firmware version (#82)

collect packages/firmware versions and export them as labels for gauge under :

mikrotik_system_package

* updated versions of dependent libs
* fetch firmware version as gauge
* fixed the things that needed to be fixed

collector/collector.go

@@ -90,6 +90,13 @@ func WithDHCPv6() Option {
 	}
 }
 
+// WithFirmware grab installed firmware and version
+func WithFirmware() Option {
+	return func(c *collector) {
+		c.collectors = append(c.collectors, newFirmwareCollector())
+	}
+}
+
 // WithHealth enables board Health metrics
 func WithHealth() Option {
 	return func(c *collector) {

collector/firmware_collector.go

@@ -0,0 +1,51 @@
+package collector
+
+import (
+	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
+	log "github.com/sirupsen/logrus"
+)
+
+type firmwareCollector struct {
+	props       []string
+	description *prometheus.Desc
+}
+
+func newFirmwareCollector() routerOSCollector {
+	c := &firmwareCollector{}
+	c.init()
+	return c
+}
+
+func (c *firmwareCollector) init() {
+	labelNames := []string{"name", "disabled", "version", "build_time"}
+	c.description = description("system", "package", "system packages version", labelNames)
+}
+
+func (c *firmwareCollector) describe(ch chan<- *prometheus.Desc) {
+	ch <- c.description
+}
+
+func (c *firmwareCollector) collect(ctx *collectorContext) error {
+	reply, err := ctx.client.Run("/system/package/getall")
+	if err != nil {
+		log.WithFields(log.Fields{
+			"device": ctx.device.Name,
+			"error":  err,
+		})
+		return err
+	}
+
+	pkgs := reply.Re
+
+	for _, pkg := range pkgs {
+		v := 1.0
+		if strings.Compare(pkg.Map["disabled"], "true") == 0 {
+			v = 0.0
+		}
+		ctx.ch <- prometheus.MustNewConstMetric(c.description, prometheus.GaugeValue, v, pkg.Map["name"], pkg.Map["disabled"], pkg.Map["version"], pkg.Map["build-time"])
+	}
+
+	return nil
+}