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package system
import (
"bufio"
"context"
"os"
"strings"
"text/template"
"github.com/containers/buildah/pkg/formats"
"github.com/containers/podman/v2/cmd/podman/registry"
"github.com/containers/podman/v2/cmd/podman/validate"
"github.com/containers/podman/v2/libpod/events"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
eventsDescription = `Monitor podman events.
By default, streaming mode is used, printing new events as they occur. Previous events can be listed via --since and --until.`
eventsCommand = &cobra.Command{
Use: "events",
Args: validate.NoArgs,
Short: "Show podman events",
Long: eventsDescription,
RunE: eventsCmd,
Example: `podman events
podman events --filter event=create
podman events --since 1h30s`,
}
)
var (
eventOptions entities.EventsOptions
eventFormat string
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: eventsCommand,
})
flags := eventsCommand.Flags()
flags.StringArrayVar(&eventOptions.Filter, "filter", []string{}, "filter output")
flags.StringVar(&eventFormat, "format", "", "format the output using a Go template")
flags.BoolVar(&eventOptions.Stream, "stream", true, "stream new events; for testing only")
flags.StringVar(&eventOptions.Since, "since", "", "show all events created since timestamp")
flags.StringVar(&eventOptions.Until, "until", "", "show all events until timestamp")
_ = flags.MarkHidden("stream")
}
func eventsCmd(cmd *cobra.Command, args []string) error {
var (
err error
eventsError error
tmpl *template.Template
)
if strings.Join(strings.Fields(eventFormat), "") == "{{json.}}" {
eventFormat = formats.JSONString
}
if eventFormat != formats.JSONString {
tmpl, err = template.New("events").Parse(eventFormat)
if err != nil {
return err
}
}
if len(eventOptions.Since) > 0 || len(eventOptions.Until) > 0 {
eventOptions.FromStart = true
}
eventChannel := make(chan *events.Event)
eventOptions.EventChan = eventChannel
go func() {
eventsError = registry.ContainerEngine().Events(context.Background(), eventOptions)
}()
if eventsError != nil {
return eventsError
}
w := bufio.NewWriter(os.Stdout)
for event := range eventChannel {
switch {
case eventFormat == formats.JSONString:
jsonStr, err := event.ToJSONString()
if err != nil {
return errors.Wrapf(err, "unable to format json")
}
if _, err := w.Write([]byte(jsonStr)); err != nil {
return err
}
case len(eventFormat) > 0:
if err := tmpl.Execute(w, event); err != nil {
return err
}
default:
if _, err := w.Write([]byte(event.ToHumanReadable())); err != nil {
return err
}
}
if _, err := w.Write([]byte("\n")); err != nil {
return err
}
if err := w.Flush(); err != nil {
return err
}
}
return nil
}
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