Metrics data is stored as structure, HTTP requests logging, got rid of context.

Metrics data now stored as structures. This is a first step for autodiscovery
helping for NMSes.

HTTP requests now logged.

Got rid of context.Context for getting metric data in applications
because context.Context is useless here.

internal/models/metric.go

@@ -0,0 +1,34 @@
+package models
+
+// Metric is a generic metric structure.
+type Metric struct {
+	// Metric name.
+	name string
+	// HELP data, if present.
+	description string
+	// Additional parameters, data inside "{}".
+	params []string
+	// Metric value.
+	value string
+}
+
+// NewMetric creates new structure for storing single metric data.
+func NewMetric(name, description string, params []string) Metric {
+	m := Metric{
+		name:        name,
+		description: description,
+		params:      params,
+	}
+
+	return m
+}
+
+// GetValue returns metric's value.
+func (m *Metric) GetValue() string {
+	return m.value
+}
+
+// SetValue sets value for metric.
+func (m *Metric) SetValue(value string) {
+	m.value = value
+}

internal/models/request_info.go

@@ -0,0 +1,9 @@
+package models
+
+// RequestInfo is a parsed request information to throw into application's handler.
+type RequestInfo struct {
+	ApiVersion  int
+	Application string
+	Metric      string
+	RequestType string
+}