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publish.go
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publish.go
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package main
import (
gocontext "context"
"io"
"io/ioutil"
"net"
"os"
"time"
eventsapi "github.com/containerd/containerd/api/services/events/v1"
"github.com/containerd/containerd/dialer"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/namespaces"
"github.com/gogo/protobuf/types"
"github.com/pkg/errors"
"github.com/urfave/cli"
"google.golang.org/grpc"
)
var publishCommand = cli.Command{
Name: "publish",
Usage: "binary to publish events to containerd",
Flags: []cli.Flag{
cli.StringFlag{
Name: "namespace",
Usage: "namespace to publish to",
},
cli.StringFlag{
Name: "topic",
Usage: "topic of the event",
},
},
Action: func(context *cli.Context) error {
ctx := namespaces.WithNamespace(gocontext.Background(), context.String("namespace"))
topic := context.String("topic")
if topic == "" {
return errors.New("topic required to publish event")
}
payload, err := getEventPayload(os.Stdin)
if err != nil {
return err
}
client, err := connectEvents(context.GlobalString("address"))
if err != nil {
return err
}
if _, err := client.Publish(ctx, &eventsapi.PublishRequest{
Topic: topic,
Event: payload,
}); err != nil {
return errdefs.FromGRPC(err)
}
return nil
},
}
func getEventPayload(r io.Reader) (*types.Any, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
var any types.Any
if err := any.Unmarshal(data); err != nil {
return nil, err
}
return &any, nil
}
func connectEvents(address string) (eventsapi.EventsClient, error) {
conn, err := connect(address, dialer.Dialer)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial %q", address)
}
return eventsapi.NewEventsClient(conn), nil
}
func connect(address string, d func(string, time.Duration) (net.Conn, error)) (*grpc.ClientConn, error) {
gopts := []grpc.DialOption{
grpc.WithBlock(),
grpc.WithInsecure(),
grpc.WithTimeout(60 * time.Second),
grpc.WithDialer(d),
grpc.FailOnNonTempDialError(true),
grpc.WithBackoffMaxDelay(3 * time.Second),
}
conn, err := grpc.Dial(dialer.DialAddress(address), gopts...)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial %q", address)
}
return conn, nil
}