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moby--moby/api/client/system/events.go
allencloud 0d459f5ed3 fix typo creats into creates in comments
Signed-off-by: allencloud <allen.sun@daocloud.io>
2016-07-16 17:55:18 +08:00

115 lines
3.1 KiB
Go

package system
import (
"fmt"
"io"
"sort"
"strings"
"time"
"golang.org/x/net/context"
"github.com/docker/docker/api/client"
"github.com/docker/docker/cli"
"github.com/docker/docker/pkg/jsonlog"
"github.com/docker/engine-api/types"
eventtypes "github.com/docker/engine-api/types/events"
"github.com/docker/engine-api/types/filters"
"github.com/spf13/cobra"
)
type eventsOptions struct {
since string
until string
filter []string
}
// NewEventsCommand creates a new cobra.Command for `docker events`
func NewEventsCommand(dockerCli *client.DockerCli) *cobra.Command {
var opts eventsOptions
cmd := &cobra.Command{
Use: "events [OPTIONS]",
Short: "Get real time events from the server",
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return runEvents(dockerCli, &opts)
},
}
flags := cmd.Flags()
flags.StringVar(&opts.since, "since", "", "Show all events created since timestamp")
flags.StringVar(&opts.until, "until", "", "Stream events until this timestamp")
flags.StringSliceVarP(&opts.filter, "filter", "f", []string{}, "Filter output based on conditions provided")
return cmd
}
func runEvents(dockerCli *client.DockerCli, opts *eventsOptions) error {
eventFilterArgs := filters.NewArgs()
// Consolidate all filter flags, and sanity check them early.
// They'll get process in the daemon/server.
for _, f := range opts.filter {
var err error
eventFilterArgs, err = filters.ParseFlag(f, eventFilterArgs)
if err != nil {
return err
}
}
options := types.EventsOptions{
Since: opts.since,
Until: opts.until,
Filters: eventFilterArgs,
}
responseBody, err := dockerCli.Client().Events(context.Background(), options)
if err != nil {
return err
}
defer responseBody.Close()
return streamEvents(responseBody, dockerCli.Out())
}
// streamEvents decodes prints the incoming events in the provided output.
func streamEvents(input io.Reader, output io.Writer) error {
return DecodeEvents(input, func(event eventtypes.Message, err error) error {
if err != nil {
return err
}
printOutput(event, output)
return nil
})
}
type eventProcessor func(event eventtypes.Message, err error) error
// printOutput prints all types of event information.
// Each output includes the event type, actor id, name and action.
// Actor attributes are printed at the end if the actor has any.
func printOutput(event eventtypes.Message, output io.Writer) {
if event.TimeNano != 0 {
fmt.Fprintf(output, "%s ", time.Unix(0, event.TimeNano).Format(jsonlog.RFC3339NanoFixed))
} else if event.Time != 0 {
fmt.Fprintf(output, "%s ", time.Unix(event.Time, 0).Format(jsonlog.RFC3339NanoFixed))
}
fmt.Fprintf(output, "%s %s %s", event.Type, event.Action, event.Actor.ID)
if len(event.Actor.Attributes) > 0 {
var attrs []string
var keys []string
for k := range event.Actor.Attributes {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
v := event.Actor.Attributes[k]
attrs = append(attrs, fmt.Sprintf("%s=%s", k, v))
}
fmt.Fprintf(output, " (%s)", strings.Join(attrs, ", "))
}
fmt.Fprint(output, "\n")
}