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root.go
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root.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 cmd
import (
"math/rand"
"os"
"time"
"github.com/spf13/cobra"
"github.com/uber/jaeger-lib/metrics"
"github.com/uber/jaeger-lib/metrics/go-kit"
"github.com/uber/jaeger-lib/metrics/go-kit/expvar"
jprom "github.com/uber/jaeger-lib/metrics/prometheus"
"go.uber.org/zap"
)
var (
metricsBackend string
logger *zap.Logger
metricsFactory metrics.Factory
)
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "jaeger-demo",
Short: "HotR.O.D. - A tracing demo application",
Long: `HotR.O.D. - A tracing demo application.`,
}
// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := RootCmd.Execute(); err != nil {
logger.Fatal("We bowled a googly", zap.Error(err))
os.Exit(-1)
}
}
func init() {
RootCmd.PersistentFlags().StringVarP(&metricsBackend, "metrics", "m", "expvar", "Metrics backend (expvar|prometheus)")
rand.Seed(int64(time.Now().Nanosecond()))
logger, _ = zap.NewDevelopment()
cobra.OnInitialize(initMetrics)
}
// initMetrics is called before the command is executed.
func initMetrics() {
if metricsBackend == "expvar" {
metricsFactory = xkit.Wrap("", expvar.NewFactory(10)) // 10 buckets for histograms
logger.Info("Using expvar as metrics backend")
} else if metricsBackend == "prometheus" {
metricsFactory = jprom.New()
logger.Info("Using Prometheus as metrics backend")
} else {
logger.Fatal("unsupported metrics backend " + metricsBackend)
}
}