Add metrics collector for HTTP status codes

monitor/http.go

@@ -0,0 +1,49 @@
+package monitor
+
+import (
+	"strconv"
+
+	"github.com/datarhei/core/v16/http/server"
+	"github.com/datarhei/core/v16/monitor/metric"
+)
+
+type httpCollector struct {
+	handler     server.Server
+	name        string
+	statusDescr *metric.Description
+}
+
+func NewHTTPCollector(name string, handler server.Server) metric.Collector {
+	c := &httpCollector{
+		handler: handler,
+		name:    name,
+	}
+
+	c.statusDescr = metric.NewDesc("http_status", "Total return status", []string{"name", "code"})
+
+	return c
+}
+
+func (c *httpCollector) Prefix() string {
+	return "filesystem"
+}
+
+func (c *httpCollector) Describe() []*metric.Description {
+	return []*metric.Description{
+		c.statusDescr,
+	}
+}
+
+func (c *httpCollector) Collect() metric.Metrics {
+	status := c.handler.HTTPStatus()
+
+	metrics := metric.NewMetrics()
+
+	for code, count := range status {
+		metrics.Add(metric.NewValue(c.statusDescr, float64(count), c.name, strconv.Itoa(code)))
+	}
+
+	return metrics
+}
+
+func (c *httpCollector) Stop() {}