mirror of
https://github.com/moby/moby.git
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115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
package system
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import (
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"fmt"
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"io"
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"sort"
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"strings"
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"time"
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"golang.org/x/net/context"
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"github.com/docker/docker/api/client"
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"github.com/docker/docker/cli"
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"github.com/docker/docker/pkg/jsonlog"
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"github.com/docker/engine-api/types"
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eventtypes "github.com/docker/engine-api/types/events"
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"github.com/docker/engine-api/types/filters"
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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 []string
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}
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// NewEventsCommand creats a new cobra.Command for `docker events`
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func NewEventsCommand(dockerCli *client.DockerCli) *cobra.Command {
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var opts eventsOptions
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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, &opts)
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},
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}
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flags := cmd.Flags()
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flags.StringVar(&opts.since, "since", "", "Show all events created since timestamp")
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flags.StringVar(&opts.until, "until", "", "Stream events until this timestamp")
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flags.StringSliceVarP(&opts.filter, "filter", "f", []string{}, "Filter output based on conditions provided")
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return cmd
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}
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func runEvents(dockerCli *client.DockerCli, opts *eventsOptions) error {
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eventFilterArgs := filters.NewArgs()
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// Consolidate all filter flags, and sanity check them early.
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// They'll get process in the daemon/server.
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for _, f := range opts.filter {
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var err error
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eventFilterArgs, err = filters.ParseFlag(f, eventFilterArgs)
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if err != nil {
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return err
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}
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}
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options := types.EventsOptions{
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Since: opts.since,
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Until: opts.until,
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Filters: eventFilterArgs,
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}
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responseBody, err := dockerCli.Client().Events(context.Background(), options)
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if err != nil {
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return err
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}
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defer responseBody.Close()
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return streamEvents(responseBody, dockerCli.Out())
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}
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// streamEvents decodes prints the incoming events in the provided output.
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func streamEvents(input io.Reader, output io.Writer) error {
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return DecodeEvents(input, func(event eventtypes.Message, err error) error {
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if err != nil {
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return err
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}
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printOutput(event, output)
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return nil
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})
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}
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type eventProcessor func(event eventtypes.Message, err error) error
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// printOutput 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 printOutput(event eventtypes.Message, output io.Writer) {
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if event.TimeNano != 0 {
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fmt.Fprintf(output, "%s ", time.Unix(0, event.TimeNano).Format(jsonlog.RFC3339NanoFixed))
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} else if event.Time != 0 {
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fmt.Fprintf(output, "%s ", time.Unix(event.Time, 0).Format(jsonlog.RFC3339NanoFixed))
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}
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fmt.Fprintf(output, "%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(output, " (%s)", strings.Join(attrs, ", "))
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}
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fmt.Fprint(output, "\n")
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}
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