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root.go
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root.go
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// Copyright 2020 Authors of Cilium
//
// 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 (
"github.com/cilium/cilium/hubble-relay/cmd/completion"
"github.com/cilium/cilium/hubble-relay/cmd/serve"
"github.com/cilium/cilium/hubble-relay/cmd/version"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
v "github.com/cilium/cilium/pkg/version"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// configFilePath defines where the hubble-relay config file should be found.
const configFilePath = "/etc/hubble-relay/config.yaml"
// New creates a new hubble-relay command.
func New() *cobra.Command {
rootCmd := &cobra.Command{
Use: "hubble-relay",
Short: "hubble-relay is a proxy server for the hubble API",
Long: "hubble-relay is a proxy server for the hubble API.",
SilenceUsage: true,
Version: v.GetCiliumVersion().Version,
}
logger := logging.DefaultLogger.WithField(logfields.LogSubsys, "hubble-relay")
vp := newViper()
flags := rootCmd.PersistentFlags()
flags.BoolP("debug", "D", false, "Enable debug messages")
vp.BindPFlags(flags)
// We need to check for the debug environment variable or CLI flag before
// loading the configuration file since on configuration file read failure
// we will emit a debug log entry.
if vp.GetBool("debug") {
logging.SetLogLevel(logrus.DebugLevel)
}
if err := vp.ReadInConfig(); err != nil {
logger.WithError(err).Debugf("Failed to read config from file '%s'", configFilePath)
}
// Check for the debug flag again now that the configuration file may has
// been loaded, as it might have changed.
if vp.GetBool("debug") {
logging.SetLogLevel(logrus.DebugLevel)
} else {
logging.SetLogLevel(logrus.InfoLevel)
}
rootCmd.AddCommand(
completion.New(),
serve.New(vp),
version.New(),
)
rootCmd.SetVersionTemplate("{{with .Name}}{{printf \"%s \" .}}{{end}}{{printf \"v%s\" .Version}}\n")
return rootCmd
}
func newViper() *viper.Viper {
vp := viper.New()
vp.SetEnvPrefix("relay")
vp.SetConfigFile(configFilePath)
vp.AutomaticEnv()
return vp
}