/
info.go
127 lines (111 loc) · 3.13 KB
/
info.go
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//
// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
//
// Licensed 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
//
// https://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 info provides general info metrics functions
package info
import (
"context"
"fmt"
"reflect"
"strconv"
"github.com/vdaas/vald/internal/observability/metrics"
)
type info struct {
name string
fullname string
info metrics.Int64Measure
kvs map[metrics.Key]string
}
// New creates new general info metric according to the provided struct.
func New(name, fullname, description string, i interface{}) (metrics.Metric, error) {
kvs, err := labelKVs(i)
if err != nil {
return nil, err
}
return &info{
name: name,
fullname: fullname,
info: *metrics.Int64(metrics.ValdOrg+"/"+name, description, metrics.UnitDimensionless),
kvs: kvs,
}, nil
}
func labelKVs(i interface{}) (map[metrics.Key]string, error) {
rt, rv := reflect.TypeOf(i), reflect.ValueOf(i)
kvs := make(map[metrics.Key]string, rt.NumField())
for k := 0; k < rt.NumField(); k++ {
keyName := rt.Field(k).Tag.Get("info")
if keyName == "" {
continue
}
var value string
switch v := rv.Field(k); v.Kind() {
case reflect.String:
value = v.String()
case reflect.Slice, reflect.Array:
switch v.Interface().(type) {
case []string:
value = fmt.Sprintf("%.255s", fmt.Sprintf("%v", v.Interface()))
case []rune:
value = v.Convert(reflect.TypeOf("")).String()
default:
continue
}
case reflect.Bool:
value = strconv.FormatBool(v.Bool())
case reflect.Int, reflect.Int8, reflect.Int16,
reflect.Int32, reflect.Int64:
value = strconv.FormatInt(v.Int(), 10)
case reflect.Uint, reflect.Uint8, reflect.Uint16,
reflect.Uint32, reflect.Uint64, reflect.Uintptr:
value = strconv.FormatUint(v.Uint(), 10)
case reflect.Float32, reflect.Float64:
value = strconv.FormatFloat(v.Float(), 'E', -1, 64)
default:
continue
}
mk, err := metrics.NewKey(keyName)
if err != nil {
return nil, err
}
kvs[mk] = value
}
return kvs, nil
}
func (i *info) Measurement(ctx context.Context) ([]metrics.Measurement, error) {
return []metrics.Measurement{}, nil
}
func (i *info) MeasurementWithTags(ctx context.Context) ([]metrics.MeasurementWithTags, error) {
return []metrics.MeasurementWithTags{
{
Measurement: i.info.M(int64(1)),
Tags: i.kvs,
},
}, nil
}
func (i *info) View() []*metrics.View {
keys := make([]metrics.Key, 0, len(i.kvs))
for k := range i.kvs {
keys = append(keys, k)
}
return []*metrics.View{
{
Name: i.fullname,
Description: i.info.Description(),
TagKeys: keys,
Measure: &i.info,
Aggregation: metrics.LastValue(),
},
}
}