[#16] .Update added metrics

cosmos.go

@@ -27,6 +27,8 @@ type Cosmos struct {
 	numMaxActiveConnections int
 	connectionIdleTimeout   time.Duration
 
+	metrics Metrics
+
 	wg sync.WaitGroup
 }
 
@@ -71,6 +73,7 @@ func New(host string, options ...Option) (*Cosmos, error) {
 		host:                    host,
 		numMaxActiveConnections: 10,
 		connectionIdleTimeout:   time.Second * 30,
+		metrics:                 NewMetrics("gremcos"),
 	}
 
 	for _, opt := range options {

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/golang/mock v1.4.0
 	github.com/gorilla/websocket v1.4.1
 	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.4.1
 	github.com/rs/zerolog v1.18.0
 	github.com/spf13/cast v1.3.1
 	github.com/stretchr/testify v1.4.0

go.sum

@@ -1,42 +1,117 @@
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metrics.go

@@ -0,0 +1,27 @@
+package gremcos
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	m "github.com/supplyon/gremcos/metrics"
+)
+
+// Metrics represents the collection of metrics internally set by the service.
+type Metrics struct {
+	statusCodeTotal m.CounterVec
+}
+
+// NewMetrics returns the metrics collection
+func NewMetrics(namespace string) Metrics {
+
+	statusCode := []string{"code"}
+	statusCodeTotal := m.NewWrappedCounterVec(prometheus.CounterOpts{
+		Namespace: namespace,
+		Subsystem: "cosmos",
+		Name:      "statuscode_total",
+		Help:      "Counts the number of responses from cosmos separated by status code.",
+	}, statusCode)
+
+	return Metrics{
+		statusCodeTotal: statusCodeTotal,
+	}
+}

metrics/metrics.go

@@ -0,0 +1,28 @@
+package metrics
+
+// Counter represents a counter metric
+type Counter interface {
+	Inc()
+	Add(float64)
+}
+
+// Gauge represents a gauge metric
+type Gauge interface {
+	Set(float64)
+	Add(float64)
+}
+
+// GaugeVec represents a vector of labelled gauges
+type GaugeVec interface {
+	WithLabelValues(lvs ...string) Gauge
+}
+
+// CounterVec represents a vector of labelled counters
+type CounterVec interface {
+	WithLabelValues(lvs ...string) Counter
+}
+
+// Histogram represents a histogram metric
+type Histogram interface {
+	Observe(float64)
+}

metrics/wrappedProm.go

@@ -0,0 +1,40 @@
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+// WrappedGaugeVec wraps a prometheus GaugeVec
+type WrappedGaugeVec struct {
+	prom *prometheus.GaugeVec
+}
+
+// WithLabelValues implements the WithLabelValues to meet the GaugeVec interface
+func (wG *WrappedGaugeVec) WithLabelValues(lvs ...string) Gauge {
+	return wG.prom.WithLabelValues(lvs...)
+}
+
+// NewWrappedGaugeVec creates a prometheus GaugeVec that is wrapped
+func NewWrappedGaugeVec(opts prometheus.GaugeOpts, labelNames []string) *WrappedGaugeVec {
+	return &WrappedGaugeVec{
+		prom: promauto.NewGaugeVec(opts, labelNames),
+	}
+}
+
+// WrappedCounterVec wraps a prometheus CounterVec
+type WrappedCounterVec struct {
+	prom *prometheus.CounterVec
+}
+
+// WithLabelValues implements the WithLabelValues to meet the CounterVec interface
+func (wG *WrappedCounterVec) WithLabelValues(lvs ...string) Counter {
+	return wG.prom.WithLabelValues(lvs...)
+}
+
+// NewWrappedCounterVec creates a prometheus CounterVec that is wrapped
+func NewWrappedCounterVec(opts prometheus.CounterOpts, labelNames []string) *WrappedCounterVec {
+	return &WrappedCounterVec{
+		prom: promauto.NewCounterVec(opts, labelNames),
+	}
+}