Add an option for starting a gops agent

Author: arnested

go.mod

@@ -17,6 +17,7 @@ require (
 require (
 	github.com/carlmjohnson/versioninfo v0.22.5
 	github.com/coreos/go-systemd/v22 v22.6.0
+	github.com/google/gops v0.3.28
 )
 
 require (

go.sum

@@ -39,6 +39,8 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/gops v0.3.28 h1:2Xr57tqKAmQYRAfG12E+yLcoa2Y42UJo2lOrUFL9ark=
+github.com/google/gops v0.3.28/go.mod h1:6f6+Nl8LcHrzJwi8+p0ii+vmBFSlB4f8cOOkTJ7sk4c=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 h1:YBftPWNWd4WwGqtY2yeZL2ef8rHAxPBD8KFhJpmcqms=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0/go.mod h1:YN5jB8ie0yfIUg6VvR9Kz84aCaG7AsGZnLjhHbUqwPg=
 github.com/holoplot/go-avahi v1.0.1 h1:XcqR2keL4qWRnlxHD5CAOdWpLFZJ+EOUK0vEuylfvvk=

main.go

@@ -13,6 +13,7 @@ import (
 	"github.com/coreos/go-systemd/v22/daemon"
 	"github.com/docker/docker/client"
 	"github.com/godbus/dbus/v5"
+	"github.com/google/gops/agent"
 	"github.com/holoplot/go-avahi"
 	"github.com/kelseyhightower/envconfig"
 	"ldddns.arnested.dk/internal/log"
@@ -29,6 +30,7 @@ var (
 //
 //nolint:lll
 type Config struct {
+	Gops                      bool     `default:"false"                          json:"Gops"                      split_words:"true"`
 	HostnameLookup            []string `default:"env:VIRTUAL_HOST,containerName" json:"HostnameLookup"            split_words:"true"`
 	IgnoreDockerComposeOneoff bool     `default:"true"                           json:"IgnoreDockerComposeOneoff" split_words:"true"`
 }
@@ -53,6 +55,8 @@ func main() {
 		panic(fmt.Errorf("could not read environment config: %w", err))
 	}
 
+	gops(config.Gops)
+
 	docker, err := client.NewClientWithOpts(
 		client.FromEnv,
 		client.WithAPIVersionNegotiation(),
@@ -132,3 +136,17 @@ func getVersion() string {
 
 	return version
 }
+
+// gops starts the gops agent if the config option is set.
+func gops(start bool) {
+	if !start {
+		return
+	}
+
+	err := agent.Listen(agent.Options{
+		ShutdownCleanup: true, // automatically closes on os.Interrupt
+	})
+	if err != nil {
+		panic(fmt.Errorf("could not start gops agent: %w", err))
+	}
+}