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version.go
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version.go
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// Copyright (C) 2019-2023 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 version
import (
"context"
"fmt"
"reflect"
"github.com/vdaas/vald/internal/info"
"github.com/vdaas/vald/internal/observability/attribute"
"github.com/vdaas/vald/internal/observability/metrics"
"github.com/vdaas/vald/internal/strings"
"go.opentelemetry.io/otel/sdk/metric/aggregation"
"go.opentelemetry.io/otel/sdk/metric/view"
)
const (
name = "app_version_info"
description = "app version info"
)
var reps = strings.NewReplacer("_", " ", ",omitempty", "")
type version struct {
kvs map[string]string
}
func New(labels ...string) metrics.Metric {
return &version{
kvs: labelKVs(labels...),
}
}
func labelKVs(labels ...string) map[string]string {
labelMap := make(map[string]struct{}, len(labels))
for _, label := range labels {
labelMap[reps.Replace(label)] = struct{}{}
}
d := info.Get()
rt, rv := reflect.TypeOf(d), reflect.ValueOf(d)
info := make(map[string]string, rt.NumField())
for i := 0; i < rt.NumField(); i++ {
keyName := reps.Replace(rt.Field(i).Tag.Get("json"))
if _, ok := labelMap[keyName]; !ok {
continue
}
v := rv.Field(i).Interface()
value, ok := v.(string)
if !ok {
ss, ok := v.([]string)
if ok {
// tags must be less than 255 characters
info[keyName] = fmt.Sprintf("%.255s", fmt.Sprintf("%v", ss))
}
continue
}
if value != "" {
info[keyName] = value
}
}
return info
}
func (*version) View() ([]*metrics.View, error) {
otlv, err := view.New(
view.MatchInstrumentName(name),
view.WithSetDescription(description),
view.WithSetAggregation(aggregation.LastValue{}),
)
if err != nil {
return nil, err
}
return []*metrics.View{
&otlv,
}, nil
}
func (v *version) Register(m metrics.Meter) error {
info, err := m.AsyncInt64().Gauge(
name,
metrics.WithDescription(description),
metrics.WithUnit(metrics.Dimensionless),
)
if err != nil {
return err
}
return m.RegisterCallback(
[]metrics.AsynchronousInstrument{
info,
},
func(ctx context.Context) {
attrs := make([]attribute.KeyValue, 0, len(v.kvs))
for key, val := range v.kvs {
attrs = append(attrs, attribute.String(key, val))
}
info.Observe(ctx, 1, attrs...)
},
)
}