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flags.go
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flags.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 flags
import (
"flag"
"fmt"
"github.com/pkg/errors"
"github.com/spf13/viper"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/jaegertracing/jaeger/plugin/storage"
)
const (
spanStorageType = "span-storage.type" // deprecated
logLevel = "log-level"
configFile = "config-file"
)
// AddConfigFileFlag adds flags for ExternalConfFlags
func AddConfigFileFlag(flagSet *flag.FlagSet) {
flagSet.String(configFile, "", "Configuration file in JSON, TOML, YAML, HCL, or Java properties formats (default none). See spf13/viper for precedence.")
}
// TryLoadConfigFile initializes viper with config file specified as flag
func TryLoadConfigFile(v *viper.Viper) error {
if file := v.GetString(configFile); file != "" {
v.SetConfigFile(file)
err := v.ReadInConfig()
if err != nil {
return errors.Wrapf(err, "cannot load config file %s", file)
}
}
return nil
}
// SharedFlags holds flags configuration
type SharedFlags struct {
// Logging holds logging configuration
Logging logging
}
type logging struct {
Level string
}
// AddFlags adds flags for SharedFlags
func AddFlags(flagSet *flag.FlagSet) {
flagSet.String(spanStorageType, "", fmt.Sprintf(`(deprecated) please use %s environment variable. Run this binary with "env" command for help.`, storage.SpanStorageTypeEnvVar))
AddLoggingFlag(flagSet)
}
// AddLoggingFlag adds logging flag for SharedFlags
func AddLoggingFlag(flagSet *flag.FlagSet) {
flagSet.String(logLevel, "info", "Minimal allowed log Level. For more levels see https://github.com/uber-go/zap")
}
// InitFromViper initializes SharedFlags with properties from viper
func (flags *SharedFlags) InitFromViper(v *viper.Viper) *SharedFlags {
flags.Logging.Level = v.GetString(logLevel)
return flags
}
// NewLogger returns logger based on configuration in SharedFlags
func (flags *SharedFlags) NewLogger(conf zap.Config, options ...zap.Option) (*zap.Logger, error) {
var level zapcore.Level
err := (&level).UnmarshalText([]byte(flags.Logging.Level))
if err != nil {
return nil, err
}
conf.Level = zap.NewAtomicLevelAt(level)
return conf.Build(options...)
}