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main.go
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main.go
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// Copyright 2018 Istio 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 main
import (
"flag"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/spf13/cobra"
"istio.io/istio/pkg/log"
"istio.io/istio/pkg/test/fakes/policy"
)
var (
port int
address string
logOptions *log.Options
)
func main() {
rootCmd := &cobra.Command{
Use: "policybackend",
Short: "Fake Policy Backend.",
SilenceUsage: true,
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
return fmt.Errorf("'%s' is an invalid argument", args[0])
}
return nil
},
}
serviceCmd := &cobra.Command{
Use: "server",
Short: "Start backend as server.",
SilenceUsage: true,
Run: func(cmd *cobra.Command, args []string) {
runServer()
},
}
rootCmd.AddCommand(serviceCmd)
resetCmd := &cobra.Command{
Use: "reset",
Short: "Reset a target Policy Backend.",
SilenceUsage: true,
Run: func(cmd *cobra.Command, args []string) {
runReset()
},
}
rootCmd.AddCommand(resetCmd)
rootCmd.SetArgs(os.Args[1:])
rootCmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)
logOptions = log.DefaultOptions()
logOptions.AttachCobraFlags(rootCmd)
rootCmd.PersistentFlags().IntVar(&port, "port", policy.DefaultPort, "GRPC port")
rootCmd.PersistentFlags().StringVar(&address, "address", "", "Address of the service")
if err := rootCmd.Execute(); err != nil {
fmt.Printf("Error during execution: %v", err)
os.Exit(-1)
}
}
func runServer() {
if err := log.Configure(logOptions); err != nil {
os.Exit(-1)
}
log.Infof("Starting up the policy backend: %v", port)
b := policy.NewPolicyBackend(port)
if err := b.Start(); err != nil {
log.Errora(err)
os.Exit(-1)
}
// Wait for the process to be shutdown.
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
<-sigs
}
func runReset() {
if err := log.Configure(logOptions); err != nil {
os.Exit(-1)
}
controller, err := policy.NewController(address)
if err != nil {
os.Exit(-1)
}
if err := controller.Reset(); err != nil {
os.Exit(-1)
}
}