metrics: metric utils

internal/metrics/utils/utils.go

@@ -0,0 +1,36 @@
+package metricsutils
+
+import (
+	"net/url"
+	"strconv"
+	"time"
+)
+
+func CalculateBeginEnd(n, limit, offset int) (int, int, bool) {
+	if n == 0 || offset >= n {
+		return 0, 0, false
+	}
+	if limit == 0 {
+		limit = n
+	}
+	if offset+limit > n {
+		limit = n - offset
+	}
+	return offset, offset + limit, true
+}
+
+func QueryInt(query url.Values, key string, defaultValue int) int {
+	value, _ := strconv.Atoi(query.Get(key))
+	if value == 0 {
+		return defaultValue
+	}
+	return value
+}
+
+func QueryDuration(query url.Values, key string, defaultValue time.Duration) time.Duration {
+	value, _ := time.ParseDuration(query.Get(key))
+	if value == 0 {
+		return defaultValue
+	}
+	return value
+}