More features (#9)

* added config file implementation, refactoring
* add gitignore
* improved test
* preperations for more metrics
* added resource metrics
* added first bgp metrics
* added asn as label for bgp metrics
* added prefix and message counts to bgp metrics
* simplified
* Update README.md
* added yaml dependency
* fixed go routine call
* added timeout
* clean up
* added TLS support
* set default api port for TLS
* added routes metric
* added missing log information
* added type collectorContext to reduce the count of parameters for better readability
* added DHCP and DHCPv6 metrics
* filter for active dhcp leases only
* added pool metrics
* enable/disable feature in config file
* refactoring

* clean up

* comment fix

collector/collector.go

@@ -37,7 +37,7 @@ var (
 
 type collector struct {
 	devices     []config.Device
-	collectors  []metricCollector
+	collectors  []routerOSCollector
 	timeout     time.Duration
 	enableTLS   bool
 	insecureTLS bool
@@ -53,7 +53,28 @@ func WithBGP() Option {
 // WithRoutes enables routing table metrics
 func WithRoutes() Option {
 	return func(c *collector) {
-		c.collectors = append(c.collectors, &routesCollector{})
+		c.collectors = append(c.collectors, newRoutesCollector())
+	}
+}
+
+// WithDHCP enables DHCP serrver metrics
+func WithDHCP() Option {
+	return func(c *collector) {
+		c.collectors = append(c.collectors, newDHCPCollector())
+	}
+}
+
+// WithDHCPv6 enables DHCPv6 serrver metrics
+func WithDHCPv6() Option {
+	return func(c *collector) {
+		c.collectors = append(c.collectors, newDHCPv6Collector())
+	}
+}
+
+// WithPools enables IP(v6) pool metrics
+func WithPools() Option {
+	return func(c *collector) {
+		c.collectors = append(c.collectors, newPoolCollector())
 	}
 }
 
@@ -84,9 +105,9 @@ func NewCollector(cfg *config.Config, opts ...Option) (prometheus.Collector, err
 	c := &collector{
 		devices: cfg.Devices,
 		timeout: DefaultTimeout,
-		collectors: []metricCollector{
-			&interfaceCollector{},
-			&resourceCollector{},
+		collectors: []routerOSCollector{
+			newInterfaceCollector(),
+			newResourceCollector(),
 		},
 	}
 
@@ -153,7 +174,8 @@ func (c *collector) connectAndCollect(d *config.Device, ch chan<- prometheus.Met
 	defer cl.Close()
 
 	for _, co := range c.collectors {
-		err = co.collect(ch, d, cl)
+		ctx := &collectorContext{ch, d, cl}
+		err = co.collect(ctx)
 		if err != nil {
 			return err
 		}