feat: add logic of prometheus and gauge type

Author: coderi421

gmicro/core/metric/gauge.go

@@ -0,0 +1,47 @@
+package metric
+
+import "github.com/prometheus/client_golang/prometheus"
+
+type (
+	GaugeVecOpts VectorOpts // GaugeVecOpts 指标向量选项
+
+	GaugeVec interface {
+		Set(v float64, labels ...string) // Set 设置标签
+		Inc(labels ...string)            // Inc 增加标签
+		Add(v float64, labels ...string) // Add 添加标签
+	}
+
+	promGaugeVec struct {
+		gauge *prometheus.GaugeVec
+	}
+)
+
+// NewGaugeVec 封装 prometheus.NewGaugeVec 为了增加 labels 参数
+func NewGaugeVec(cfg *GaugeVecOpts) GaugeVec {
+	if cfg == nil {
+		return nil
+	}
+
+	vec := prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: cfg.Namespace,
+		Subsystem: cfg.Subsystem,
+		Name:      cfg.Name,
+		Help:      cfg.Help,
+	}, cfg.Labels)
+	// 反向注册，将指标注册到指标注册器中
+	prometheus.MustRegister(vec)
+	//将注册到指标注册器中的指标包装成promGaugeVec
+	return &promGaugeVec{gauge: vec}
+}
+
+func (p promGaugeVec) Set(v float64, labels ...string) {
+	p.gauge.WithLabelValues(labels...).Set(v)
+}
+
+func (p promGaugeVec) Inc(labels ...string) {
+	p.gauge.WithLabelValues(labels...).Inc()
+}
+
+func (p promGaugeVec) Add(v float64, labels ...string) {
+	p.gauge.WithLabelValues(labels...).Add(v)
+}

gmicro/core/metric/metric.go

@@ -0,0 +1,10 @@
+package metric
+
+// VectorOpts 指标选项
+type VectorOpts struct {
+	Namespace string   // 命名空间
+	Subsystem string   // 子系统
+	Name      string   // 指标名称
+	Help      string   // 指标帮助信息
+	Labels    []string // 指标标签
+}

gmicro/server/rpcserver/serverinterceptors/prometheusinterceptors.go

@@ -0,0 +1 @@
+package serverinterceptors