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serve.go
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serve.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 serve
import (
"fmt"
"os"
"os/signal"
"time"
"github.com/cilium/cilium/pkg/hubble/relay/defaults"
"github.com/cilium/cilium/pkg/hubble/relay/server"
"github.com/cilium/cilium/pkg/pprof"
"github.com/google/gops/agent"
"github.com/spf13/cobra"
"golang.org/x/sys/unix"
)
type flags struct {
debug bool
pprof bool
gops bool
gopsPort int
dialTimeout time.Duration
listenAddress string
peerService string
retryTimeout time.Duration
sortBufferMaxLen int
sortBufferDrainTimeout time.Duration
}
// New creates a new serve command.
func New() *cobra.Command {
var f flags
cmd := &cobra.Command{
Use: "serve",
Short: "Run the gRPC proxy server",
Long: `Run the gRPC proxy server.`,
RunE: func(_ *cobra.Command, _ []string) error {
return runServe(f)
},
}
cmd.Flags().BoolVarP(
&f.debug, "debug", "D", false, "Run in debug mode",
)
cmd.Flags().BoolVar(
&f.pprof, "pprof", false, "Enable serving the pprof debugging API",
)
cmd.Flags().BoolVar(
&f.gops, "gops", true, "Run gops agent",
)
cmd.Flags().IntVar(
&f.gopsPort, "gops-port",
defaults.GopsPort,
"Port for gops server to listen on")
cmd.Flags().DurationVar(
&f.dialTimeout, "dial-timeout",
defaults.DialTimeout,
"Dial timeout when connecting to hubble peers")
cmd.Flags().DurationVar(
&f.retryTimeout, "retry-timeout",
defaults.RetryTimeout,
"Time to wait before attempting to reconnect to a hubble peer when the connection is lost")
cmd.Flags().StringVar(
&f.listenAddress, "listen-address",
defaults.ListenAddress,
"Address on which to listen")
cmd.Flags().StringVar(
&f.peerService, "peer-service",
defaults.HubbleTarget,
"Address of the server that implements the peer gRPC service")
cmd.Flags().IntVar(
&f.sortBufferMaxLen, "sort-buffer-len-max",
defaults.SortBufferMaxLen,
"Max number of flows that can be buffered for sorting before being sent to the client (per request)")
cmd.Flags().DurationVar(
&f.sortBufferDrainTimeout, "sort-buffer-drain-timeout",
defaults.SortBufferDrainTimeout,
"When the per-request flows sort buffer is not full, a flow is drained every time this timeout is reached (only affects requests in follow-mode)")
return cmd
}
func runServe(f flags) error {
opts := []server.Option{
server.WithDialTimeout(f.dialTimeout),
server.WithHubbleTarget(f.peerService),
server.WithListenAddress(f.listenAddress),
server.WithRetryTimeout(f.retryTimeout),
server.WithSortBufferMaxLen(f.sortBufferMaxLen),
server.WithSortBufferDrainTimeout(f.sortBufferDrainTimeout),
}
if f.debug {
opts = append(opts, server.WithDebug())
}
if f.pprof {
pprof.Enable()
}
if f.gops {
addr := fmt.Sprintf("127.0.0.1:%d", f.gopsPort)
if err := agent.Listen(agent.Options{
Addr: addr,
ReuseSocketAddrAndPort: true,
}); err != nil {
return fmt.Errorf("failed to start gops agent: %v", err)
}
}
srv, err := server.New(opts...)
if err != nil {
return fmt.Errorf("cannot create hubble-relay server: %v", err)
}
go func() {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, unix.SIGINT, unix.SIGTERM)
<-sigs
srv.Stop()
if f.gops {
agent.Close()
}
}()
return srv.Serve()
}