Initial cloud-services repo - gateway service + pkg modules

pkg/clickhouse/options.go

@@ -0,0 +1,31 @@
+package clickhouse
+
+import (
+	"net/http"
+
+	"fiskerinc.com/modules/validator"
+
+	"github.com/gorilla/schema"
+)
+
+const PageQueryOptionsLimitMaximum = 100
+
+type PageQueryOptions struct {
+	Limit  int `json:"limit" validate:"gte=0,lte=100"`
+	Offset int `json:"offset" validate:"gte=0"`
+}
+
+// ParsePageQuery parses PageQueryOptions from http request
+func ParsePageQuery(r *http.Request) (PageQueryOptions, error) {
+	decoder := schema.NewDecoder()
+	options := PageQueryOptions{}
+
+	decoder.SetAliasTag("json")
+	decoder.Decode(&options, r.URL.Query())
+	err := validator.ValidateStruct(options)
+	if err == nil && options.Limit == 0 {
+		options.Limit = PageQueryOptionsLimitMaximum
+	}
+
+	return options, err
+}