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add docker events --format

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Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2016-09-02 07:40:06 +00:00
parent 3ae023cd22
commit 5af5a1be62
7 changed files with 152 additions and 13 deletions
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54
cli/command/system/events.go
View file

@ -3,8 +3,10 @@ package system
import (
"fmt"
"io"
"io/ioutil"
"sort"
"strings"
"text/template"
"time"
"golang.org/x/net/context"
@ -15,6 +17,7 @@ import (
"github.com/docker/docker/cli/command"
"github.com/docker/docker/opts"
"github.com/docker/docker/pkg/jsonlog"
"github.com/docker/docker/utils/templates"
"github.com/spf13/cobra"
)
@ -22,6 +25,7 @@ type eventsOptions struct {
since string
until string
filter opts.FilterOpt
format string
}
// NewEventsCommand creates a new cobra.Command for `docker events`
@ -41,11 +45,18 @@ func NewEventsCommand(dockerCli *command.DockerCli) *cobra.Command {
flags.StringVar(&opts.since, "since", "", "Show all events created since timestamp")
flags.StringVar(&opts.until, "until", "", "Stream events until this timestamp")
flags.VarP(&opts.filter, "filter", "f", "Filter output based on conditions provided")
flags.StringVar(&opts.format, "format", "", "Format the output using the given go template")
return cmd
}
func runEvents(dockerCli *command.DockerCli, opts *eventsOptions) error {
tmpl, err := makeTemplate(opts.format)
if err != nil {
return cli.StatusError{
StatusCode: 64,
Status: "Error parsing format: " + err.Error()}
}
options := types.EventsOptions{
Since: opts.since,
Until: opts.until,
@ -58,33 +69,48 @@ func runEvents(dockerCli *command.DockerCli, opts *eventsOptions) error {
}
defer responseBody.Close()
return streamEvents(responseBody, dockerCli.Out())
return streamEvents(dockerCli.Out(), responseBody, tmpl)
}
func makeTemplate(format string) (*template.Template, error) {
if format == "" {
return nil, nil
}
tmpl, err := templates.Parse(format)
if err != nil {
return tmpl, err
}
// we execute the template for an empty message, so as to validate
// a bad template like "{{.badFieldString}}"
return tmpl, tmpl.Execute(ioutil.Discard, &eventtypes.Message{})
}
// streamEvents decodes prints the incoming events in the provided output.
func streamEvents(input io.Reader, output io.Writer) error {
func streamEvents(out io.Writer, input io.Reader, tmpl *template.Template) error {
return DecodeEvents(input, func(event eventtypes.Message, err error) error {
if err != nil {
return err
}
printOutput(event, output)
return nil
if tmpl == nil {
return prettyPrintEvent(out, event)
}
return formatEvent(out, event, tmpl)
})
}
type eventProcessor func(event eventtypes.Message, err error) error
// printOutput prints all types of event information.
// prettyPrintEvent 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) {
func prettyPrintEvent(out io.Writer, event eventtypes.Message) error {
if event.TimeNano != 0 {
fmt.Fprintf(output, "%s ", time.Unix(0, event.TimeNano).Format(jsonlog.RFC3339NanoFixed))
fmt.Fprintf(out, "%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(out, "%s ", time.Unix(event.Time, 0).Format(jsonlog.RFC3339NanoFixed))
}
fmt.Fprintf(output, "%s %s %s", event.Type, event.Action, event.Actor.ID)
fmt.Fprintf(out, "%s %s %s", event.Type, event.Action, event.Actor.ID)
if len(event.Actor.Attributes) > 0 {
var attrs []string
@ -97,7 +123,13 @@ func printOutput(event eventtypes.Message, output io.Writer) {
v := event.Actor.Attributes[k]
attrs = append(attrs, fmt.Sprintf("%s=%s", k, v))
}
fmt.Fprintf(output, " (%s)", strings.Join(attrs, ", "))
fmt.Fprintf(out, " (%s)", strings.Join(attrs, ", "))
}
fmt.Fprint(output, "\n")
fmt.Fprint(out, "\n")
return nil
}
func formatEvent(out io.Writer, event eventtypes.Message, tmpl *template.Template) error {
defer out.Write([]byte{'\n'})
return tmpl.Execute(out, event)
}

2
contrib/completion/bash/docker
View file

@ -1162,7 +1162,7 @@ _docker_events() {
case "$cur" in
-*)
COMPREPLY=( $( compgen -W "--filter -f --help --since --until" -- "$cur" ) )
COMPREPLY=( $( compgen -W "--filter -f --help --since --until --format" -- "$cur" ) )
;;
esac
}

1
contrib/completion/fish/docker.fish
View file

@ -164,6 +164,7 @@ complete -c docker -A -f -n '__fish_seen_subcommand_from events' -s f -l filter
complete -c docker -A -f -n '__fish_seen_subcommand_from events' -l help -d 'Print usage'
complete -c docker -A -f -n '__fish_seen_subcommand_from events' -l since -d 'Show all events created since timestamp'
complete -c docker -A -f -n '__fish_seen_subcommand_from events' -l until -d 'Stream events until this timestamp'
complete -c docker -A -f -n '__fish_seen_subcommand_from events' -l format -d 'Format the output using the given go template'
# exec
complete -c docker -f -n '__fish_docker_no_subcommand' -a exec -d 'Run a command in a running container'

3
contrib/completion/zsh/_docker
View file

@ -1660,7 +1660,8 @@ __docker_subcommand() {
$opts_help \
"($help)*"{-f=,--filter=}"[Filter values]:filter:__docker_complete_events_filter" \
"($help)--since=[Events created since this timestamp]:timestamp: " \
"($help)--until=[Events created until this timestamp]:timestamp: " && ret=0
"($help)--until=[Events created until this timestamp]:timestamp: " \
"($help)--format=[Format the output using the given go template]:template: " && ret=0
;;
(exec)
local state

30
docs/reference/commandline/events.md
View file

@ -17,6 +17,7 @@ Get real time events from the server
Options:
-f, --filter value Filter output based on conditions provided (default [])
--format string Format the output using the given go template
--help Print usage
--since string Show all events created since timestamp
--until string Stream events until this timestamp
@ -85,6 +86,16 @@ The currently supported filters are:
* network (`network=<name or id>`)
* daemon (`daemon=<name or id>`)
## Format
If a format (`--format`) is specified, the given template will be executed
instead of the default
format. Go's [text/template](http://golang.org/pkg/text/template/) package
describes all the details of the format.
If a format is set to `{{json .}}`, the events are streamed as valid JSON
Lines. For information about JSON Lines, please refer to http://jsonlines.org/ .
## Examples
You'll need two shells for this example.
@ -180,3 +191,22 @@ relative to the current time on the client machine:
$ docker events --filter 'type=plugin' (experimental)
2016-07-25T17:30:14.825557616Z plugin pull ec7b87f2ce84330fe076e666f17dfc049d2d7ae0b8190763de94e1f2d105993f (name=tiborvass/no-remove:latest)
2016-07-25T17:30:14.888127370Z plugin enable ec7b87f2ce84330fe076e666f17dfc049d2d7ae0b8190763de94e1f2d105993f (name=tiborvass/no-remove:latest)
**Format:**
$ docker events --filter 'type=container' --format 'Type={{.Type}} Status={{.Status}} ID={{.ID}}'
Type=container Status=create ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=attach ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=start ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=resize ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=die ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=destroy ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
**Format (as JSON Lines):**
$ docker events --format '{{json .}}'
{"status":"create","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..
{"status":"attach","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..
{"Type":"network","Action":"connect","Actor":{"ID":"1b50a5bf755f6021dfa78e..
{"status":"start","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f42..
{"status":"resize","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..

46
integration-cli/docker_cli_events_test.go
View file

@ -2,7 +2,9 @@ package main
import (
"bufio"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
@ -11,6 +13,7 @@ import (
"sync"
"time"
eventtypes "github.com/docker/docker/api/types/events"
eventstestutils "github.com/docker/docker/daemon/events/testutils"
"github.com/docker/docker/pkg/integration/checker"
icmd "github.com/docker/docker/pkg/integration/cmd"
@ -745,3 +748,46 @@ func (s *DockerSuite) TestEventsUntilInThePast(c *check.C) {
c.Assert(out, checker.Not(checker.Contains), "test-container2")
c.Assert(out, checker.Contains, "test-container")
}
func (s *DockerSuite) TestEventsFormat(c *check.C) {
since := daemonUnixTime(c)
dockerCmd(c, "run", "--rm", "busybox", "true")
dockerCmd(c, "run", "--rm", "busybox", "true")
out, _ := dockerCmd(c, "events", "--since", since, "--until", daemonUnixTime(c), "--format", "{{json .}}")
dec := json.NewDecoder(strings.NewReader(out))
// make sure we got 2 start events
startCount := 0
for {
var err error
var ev eventtypes.Message
if err = dec.Decode(&ev); err == io.EOF {
break
}
c.Assert(err, checker.IsNil)
if ev.Status == "start" {
startCount++
}
}
c.Assert(startCount, checker.Equals, 2, check.Commentf("should have had 2 start events but had %d, out: %s", startCount, out))
}
func (s *DockerSuite) TestEventsFormatBadFunc(c *check.C) {
// make sure it fails immediately, without receiving any event
result := dockerCmdWithResult("events", "--format", "{{badFuncString .}}")
c.Assert(result, icmd.Matches, icmd.Expected{
Error: "exit status 64",
ExitCode: 64,
Err: "Error parsing format: template: :1: function \"badFuncString\" not defined",
})
}
func (s *DockerSuite) TestEventsFormatBadField(c *check.C) {
// make sure it fails immediately, without receiving any event
result := dockerCmdWithResult("events", "--format", "{{.badFieldString}}")
c.Assert(result, icmd.Matches, icmd.Expected{
Error: "exit status 64",
ExitCode: 64,
Err: "Error parsing format: template: :1:2: executing \"\" at <.badFieldString>: can't evaluate field badFieldString in type *events.Message",
})
}

29
man/docker-events.1.md
View file

@ -10,6 +10,7 @@ docker-events - Get real time events from the server
[**-f**|**--filter**[=*[]*]]
[**--since**[=*SINCE*]]
[**--until**[=*UNTIL*]]
[**--format**[=*FORMAT*]]
# DESCRIPTION
@ -45,6 +46,9 @@ Docker networks report the following events:
**--until**=""
Stream events until this timestamp
**--format**=""
Format the output using the given go template
The `--since` and `--until` parameters can be Unix timestamps, date formatted
timestamps, or Go duration strings (e.g. `10m`, `1h30m`) computed
relative to the client machine's time. If you do not provide the `--since` option,
@ -96,6 +100,31 @@ relative to the current time on the client machine:
If you do not provide the --since option, the command returns only new and/or
live events.
## Format
If a format (`--format`) is specified, the given template will be executed
instead of the default format. Go's **text/template** package describes all the
details of the format.
# docker events --filter 'type=container' --format 'Type={{.Type}} Status={{.Status}} ID={{.ID}}'
Type=container Status=create ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=attach ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=start ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=resize ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=die ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
Type=container Status=destroy ID=2ee349dac409e97974ce8d01b70d250b85e0ba8189299c126a87812311951e26
If a format is set to `{{json .}}`, the events are streamed as valid JSON
Lines. For information about JSON Lines, please refer to http://jsonlines.org/ .
# docker events --format '{{json .}}'
{"status":"create","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..
{"status":"attach","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..
{"Type":"network","Action":"connect","Actor":{"ID":"1b50a5bf755f6021dfa78e..
{"status":"start","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f42..
{"status":"resize","id":"196016a57679bf42424484918746a9474cd905dd993c4d0f4..
# HISTORY
April 2014, Originally compiled by William Henry (whenry at redhat dot com)
based on docker.com source material and internal work.