mirror of https://github.com/docker/cli.git
144 lines
3.8 KiB
Go
144 lines
3.8 KiB
Go
package system
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import (
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"context"
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"fmt"
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"io"
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"sort"
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"strings"
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"text/template"
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"time"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/docker/cli/cli/command/completion"
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"github.com/docker/cli/opts"
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"github.com/docker/cli/templates"
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"github.com/docker/docker/api/types"
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eventtypes "github.com/docker/docker/api/types/events"
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"github.com/spf13/cobra"
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)
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type eventsOptions struct {
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since string
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until string
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filter opts.FilterOpt
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format string
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}
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// NewEventsCommand creates a new cobra.Command for `docker events`
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func NewEventsCommand(dockerCli command.Cli) *cobra.Command {
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options := eventsOptions{filter: opts.NewFilterOpt()}
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cmd := &cobra.Command{
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Use: "events [OPTIONS]",
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Short: "Get real time events from the server",
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Args: cli.NoArgs,
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RunE: func(cmd *cobra.Command, args []string) error {
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return runEvents(dockerCli, &options)
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},
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ValidArgsFunction: completion.NoComplete,
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}
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flags := cmd.Flags()
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flags.StringVar(&options.since, "since", "", "Show all events created since timestamp")
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flags.StringVar(&options.until, "until", "", "Stream events until this timestamp")
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flags.VarP(&options.filter, "filter", "f", "Filter output based on conditions provided")
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flags.StringVar(&options.format, "format", "", "Format the output using the given Go template")
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return cmd
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}
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func runEvents(dockerCli command.Cli, options *eventsOptions) error {
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tmpl, err := makeTemplate(options.format)
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if err != nil {
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return cli.StatusError{
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StatusCode: 64,
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Status: "Error parsing format: " + err.Error()}
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}
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eventOptions := types.EventsOptions{
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Since: options.since,
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Until: options.until,
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Filters: options.filter.Value(),
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}
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ctx, cancel := context.WithCancel(context.Background())
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events, errs := dockerCli.Client().Events(ctx, eventOptions)
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defer cancel()
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out := dockerCli.Out()
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for {
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select {
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case event := <-events:
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if err := handleEvent(out, event, tmpl); err != nil {
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return err
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}
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case err := <-errs:
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if err == io.EOF {
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return nil
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}
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return err
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}
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}
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}
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func handleEvent(out io.Writer, event eventtypes.Message, tmpl *template.Template) error {
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if tmpl == nil {
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return prettyPrintEvent(out, event)
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}
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return formatEvent(out, event, tmpl)
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}
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func makeTemplate(format string) (*template.Template, error) {
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if format == "" {
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return nil, nil
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}
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tmpl, err := templates.Parse(format)
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if err != nil {
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return tmpl, err
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}
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// we execute the template for an empty message, so as to validate
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// a bad template like "{{.badFieldString}}"
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return tmpl, tmpl.Execute(io.Discard, &eventtypes.Message{})
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}
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// rfc3339NanoFixed is similar to time.RFC3339Nano, except it pads nanoseconds
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// zeros to maintain a fixed number of characters
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const rfc3339NanoFixed = "2006-01-02T15:04:05.000000000Z07:00"
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// prettyPrintEvent prints all types of event information.
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// Each output includes the event type, actor id, name and action.
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// Actor attributes are printed at the end if the actor has any.
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func prettyPrintEvent(out io.Writer, event eventtypes.Message) error {
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if event.TimeNano != 0 {
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fmt.Fprintf(out, "%s ", time.Unix(0, event.TimeNano).Format(rfc3339NanoFixed))
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} else if event.Time != 0 {
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fmt.Fprintf(out, "%s ", time.Unix(event.Time, 0).Format(rfc3339NanoFixed))
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}
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fmt.Fprintf(out, "%s %s %s", event.Type, event.Action, event.Actor.ID)
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if len(event.Actor.Attributes) > 0 {
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var attrs []string
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var keys []string
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for k := range event.Actor.Attributes {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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for _, k := range keys {
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v := event.Actor.Attributes[k]
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attrs = append(attrs, fmt.Sprintf("%s=%s", k, v))
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}
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fmt.Fprintf(out, " (%s)", strings.Join(attrs, ", "))
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}
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fmt.Fprint(out, "\n")
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return nil
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}
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func formatEvent(out io.Writer, event eventtypes.Message, tmpl *template.Template) error {
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defer out.Write([]byte{'\n'})
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return tmpl.Execute(out, event)
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}
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