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metadata.go
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metadata.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package models
import (
"github.com/jedib0t/go-pretty/v6/table"
"github.com/lindb/lindb/sql/stmt"
)
// Metadata represents metadata query result model
type Metadata struct {
Type string `json:"type"`
Values interface{} `json:"values"`
}
// ToTable returns metadata list as table if it has value, else return empty string.
func (m *Metadata) ToTable() (rows int, tableStr string) {
writer := NewTableFormatter()
switch m.Type {
case stmt.Namespace.String():
return m.toTableForStringValues(table.Row{"Namespace"}, writer)
case stmt.Metric.String():
return m.toTableForStringValues(table.Row{"Metric"}, writer)
case stmt.TagKey.String():
return m.toTableForStringValues(table.Row{"Tag Key"}, writer)
case stmt.TagValue.String():
return m.toTableForStringValues(table.Row{"Tag Value"}, writer)
case stmt.Field.String():
return m.toTableForMapValues(table.Row{"Name", "Type"}, []string{"name", "type"}, writer)
default:
return 0, ""
}
}
// toTableForStringValues returns table for string values.
func (m *Metadata) toTableForStringValues(header table.Row, writer table.Writer) (rows int, tableStr string) {
writer.AppendHeader(header)
values := m.Values.([]interface{})
for i := range values {
writer.AppendRow(table.Row{values[i]})
}
return len(values), writer.Render()
}
// toTableForMapValues returns table for map values.
func (m *Metadata) toTableForMapValues(header table.Row, cols []string, writer table.Writer) (rows int, tableStr string) {
writer.AppendHeader(header)
values := m.Values.([]interface{})
for _, value := range values {
mapValue := value.(map[string]interface{})
var row table.Row
for _, col := range cols {
row = append(row, mapValue[col])
}
writer.AppendRow(row)
}
return len(values), writer.Render()
}
// Field represents field metadata
type Field struct {
Name string `json:"name"`
Type string `json:"type"`
}