/
configtelemetry.go
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/
configtelemetry.go
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// Copyright The OpenTelemetry Authors
//
// 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
//
// 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 configtelemetry
import (
"flag"
"fmt"
"strings"
)
const (
// LevelNone indicates that no telemetry data should be collected.
LevelNone Level = iota - 1
// LevelBasic is the recommended and covers the basics of the service telemetry.
LevelBasic
// LevelNormal adds some other indicators on top of basic.
LevelNormal
// LevelDetailed adds dimensions and views to the previous levels.
LevelDetailed
levelNoneStr = "none"
levelBasicStr = "basic"
levelNormalStr = "normal"
levelDetailedStr = "detailed"
metricsLevelCfg = "metrics-level"
)
var metricsLevelPtr = new(Level)
// Flags is a helper func, to add the telemetry config flags to the service that exposes
// the application flags.
func Flags(flags *flag.FlagSet) {
flags.Var(
metricsLevelPtr,
metricsLevelCfg,
"Output level of telemetry metrics (none, basic, normal, detailed)")
}
// Level is the level of internal telemetry (metrics, logs, traces about the component itself)
// that every component should generate.
type Level int8
var _ flag.Value = (*Level)(nil)
func (l *Level) String() string {
switch *l {
case LevelNone:
return levelNoneStr
case LevelBasic:
return levelBasicStr
case LevelNormal:
return levelNormalStr
case LevelDetailed:
return levelDetailedStr
}
return "unknown"
}
func (l *Level) Set(s string) error {
lvl, err := parseLevel(s)
if err != nil {
return err
}
*l = lvl
return nil
}
// GetMetricsLevelFlagValue returns the value of the "--metrics-level" flag.
// IMPORTANT: This must be used only in the core collector code for the moment.
func GetMetricsLevelFlagValue() Level {
return *metricsLevelPtr
}
// TelemetrySetting exposes the common Telemetry configuration for one component.
type TelemetrySetting struct {
// MetricsLevelStr is the level of telemetry metrics, the possible values are:
// - "none" indicates that no telemetry data should be collected;
// - "basic" is the recommended and covers the basics of the service telemetry.
// - "normal" adds some other indicators on top of basic.
// - "detailed" adds dimensions and views to the previous levels.
MetricsLevelStr string `mapstructure:"metrics_level"`
}
// DefaultTelemetrySetting returns the default TelemetrySetting.
// The level is set to the "--metrics-level" flag if set, otherwise the default "basic" level.
func DefaultTelemetrySetting() TelemetrySetting {
return TelemetrySetting{
MetricsLevelStr: metricsLevelPtr.String(),
}
}
// GetMetricsLevel returns the parsed level, or error if unknown value.
// Empty string is consider unknown value.
func (ts TelemetrySetting) GetMetricsLevel() (Level, error) {
return parseLevel(ts.MetricsLevelStr)
}
// ParseLevel returns the Level represented by the string. The parsing is case-insensitive
// and it returns error if the string value is unknown.
func parseLevel(str string) (Level, error) {
str = strings.ToLower(str)
switch str {
case levelNoneStr:
return LevelNone, nil
case levelBasicStr:
return LevelBasic, nil
case levelNormalStr:
return LevelNormal, nil
case levelDetailedStr:
return LevelDetailed, nil
}
return LevelNone, fmt.Errorf("unknown metrics level %q", str)
}