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events.go
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events.go
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package client
import (
"encoding/json"
"fmt"
"io"
"sort"
"strings"
"sync"
"time"
"golang.org/x/net/context"
"github.com/Sirupsen/logrus"
Cli "github.com/docker/docker/cli"
"github.com/docker/docker/opts"
"github.com/docker/docker/pkg/jsonlog"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/engine-api/types"
eventtypes "github.com/docker/engine-api/types/events"
"github.com/docker/engine-api/types/filters"
)
// CmdEvents prints a live stream of real time events from the server.
//
// Usage: docker events [OPTIONS]
func (cli *DockerCli) CmdEvents(args ...string) error {
cmd := Cli.Subcmd("events", nil, Cli.DockerCommands["events"].Description, true)
since := cmd.String([]string{"-since"}, "", "Show all events created since timestamp")
until := cmd.String([]string{"-until"}, "", "Stream events until this timestamp")
flFilter := opts.NewListOpts(nil)
cmd.Var(&flFilter, []string{"f", "-filter"}, "Filter output based on conditions provided")
cmd.Require(flag.Exact, 0)
cmd.ParseFlags(args, true)
eventFilterArgs := filters.NewArgs()
// Consolidate all filter flags, and sanity check them early.
// They'll get process in the daemon/server.
for _, f := range flFilter.GetAll() {
var err error
eventFilterArgs, err = filters.ParseFlag(f, eventFilterArgs)
if err != nil {
return err
}
}
options := types.EventsOptions{
Since: *since,
Until: *until,
Filters: eventFilterArgs,
}
responseBody, err := cli.client.Events(context.Background(), options)
if err != nil {
return err
}
defer responseBody.Close()
return streamEvents(responseBody, cli.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
func decodeEvents(input io.Reader, ep eventProcessor) error {
dec := json.NewDecoder(input)
for {
var event eventtypes.Message
err := dec.Decode(&event)
if err != nil && err == io.EOF {
break
}
if procErr := ep(event, err); procErr != nil {
return procErr
}
}
return nil
}
// 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")
}
type eventHandler struct {
handlers map[string]func(eventtypes.Message)
mu sync.Mutex
}
func (w *eventHandler) Handle(action string, h func(eventtypes.Message)) {
w.mu.Lock()
w.handlers[action] = h
w.mu.Unlock()
}
// Watch ranges over the passed in event chan and processes the events based on the
// handlers created for a given action.
// To stop watching, close the event chan.
func (w *eventHandler) Watch(c <-chan eventtypes.Message) {
for e := range c {
w.mu.Lock()
h, exists := w.handlers[e.Action]
w.mu.Unlock()
if !exists {
continue
}
logrus.Debugf("event handler: received event: %v", e)
go h(e)
}
}