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options.go
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options.go
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// Copyright (c) 2018 The Jaeger 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 kafka
import (
"flag"
"fmt"
"strings"
"github.com/spf13/viper"
"github.com/jaegertracing/jaeger/pkg/kafka/producer"
)
const (
// EncodingJSON is used for spans encoded as Protobuf-based JSON.
EncodingJSON = "json"
// EncodingProto is used for spans encoded as Protobuf.
EncodingProto = "protobuf"
// EncodingZipkinThrift is used for spans encoded as Zipkin Thrift.
EncodingZipkinThrift = "zipkin-thrift"
configPrefix = "kafka.producer"
suffixBrokers = ".brokers"
suffixTopic = ".topic"
suffixEncoding = ".encoding"
defaultBroker = "127.0.0.1:9092"
defaultTopic = "jaeger-spans"
defaultEncoding = EncodingProto
)
var (
// AllEncodings is a list of all supported encodings.
AllEncodings = []string{EncodingJSON, EncodingProto, EncodingZipkinThrift}
)
// Options stores the configuration options for Kafka
type Options struct {
config producer.Configuration
topic string
encoding string
}
// AddFlags adds flags for Options
func (opt *Options) AddFlags(flagSet *flag.FlagSet) {
flagSet.String(
configPrefix+suffixBrokers,
defaultBroker,
"(experimental) The comma-separated list of kafka brokers. i.e. '127.0.0.1:9092,0.0.0:1234'")
flagSet.String(
configPrefix+suffixTopic,
defaultTopic,
"(experimental) The name of the kafka topic")
flagSet.String(
configPrefix+suffixEncoding,
defaultEncoding,
fmt.Sprintf(`(experimental) Encoding of spans ("%s" or "%s") sent to kafka.`, EncodingJSON, EncodingProto),
)
}
// InitFromViper initializes Options with properties from viper
func (opt *Options) InitFromViper(v *viper.Viper) {
opt.config = producer.Configuration{
Brokers: strings.Split(stripWhiteSpace(v.GetString(configPrefix+suffixBrokers)), ","),
}
opt.topic = v.GetString(configPrefix + suffixTopic)
opt.encoding = v.GetString(configPrefix + suffixEncoding)
}
// stripWhiteSpace removes all whitespace characters from a string
func stripWhiteSpace(str string) string {
return strings.Replace(str, " ", "", -1)
}