Merge pull request #12066 from LK4D4/split_events

Remove engine usage from events

api/server/server.go

@@ -3,6 +3,7 @@ package server
 import (
 	"bufio"
 	"bytes"
+	"time"
 
 	"encoding/base64"
 	"encoding/json"
@@ -23,7 +24,9 @@ import (
 	"github.com/docker/docker/daemon"
 	"github.com/docker/docker/daemon/networkdriver/bridge"
 	"github.com/docker/docker/engine"
+	"github.com/docker/docker/pkg/jsonmessage"
 	"github.com/docker/docker/pkg/parsers"
+	"github.com/docker/docker/pkg/parsers/filters"
 	"github.com/docker/docker/pkg/stdcopy"
 	"github.com/docker/docker/pkg/streamformatter"
 	"github.com/docker/docker/pkg/version"
@@ -324,13 +327,104 @@ func getEvents(eng *engine.Engine, version version.Version, w http.ResponseWrite
 	if err := parseForm(r); err != nil {
 		return err
 	}
+	var since int64 = -1
+	if r.Form.Get("since") != "" {
+		s, err := strconv.ParseInt(r.Form.Get("since"), 10, 64)
+		if err != nil {
+			return err
+		}
+		since = s
+	}
 
-	var job = eng.Job("events")
-	streamJSON(job, w, true)
-	job.Setenv("since", r.Form.Get("since"))
-	job.Setenv("until", r.Form.Get("until"))
-	job.Setenv("filters", r.Form.Get("filters"))
-	return job.Run()
+	var until int64 = -1
+	if r.Form.Get("until") != "" {
+		u, err := strconv.ParseInt(r.Form.Get("until"), 10, 64)
+		if err != nil {
+			return err
+		}
+		until = u
+	}
+	timer := time.NewTimer(0)
+	timer.Stop()
+	if until > 0 {
+		dur := time.Unix(until, 0).Sub(time.Now())
+		timer = time.NewTimer(dur)
+	}
+
+	ef, err := filters.FromParam(r.Form.Get("filters"))
+	if err != nil {
+		return err
+	}
+
+	isFiltered := func(field string, filter []string) bool {
+		if len(filter) == 0 {
+			return false
+		}
+		for _, v := range filter {
+			if v == field {
+				return false
+			}
+			if strings.Contains(field, ":") {
+				image := strings.Split(field, ":")
+				if image[0] == v {
+					return false
+				}
+			}
+		}
+		return true
+	}
+
+	d := getDaemon(eng)
+	es := d.EventsService
+	w.Header().Set("Content-Type", "application/json")
+	enc := json.NewEncoder(utils.NewWriteFlusher(w))
+
+	getContainerId := func(cn string) string {
+		c, err := d.Get(cn)
+		if err != nil {
+			return ""
+		}
+		return c.ID
+	}
+
+	sendEvent := func(ev *jsonmessage.JSONMessage) error {
+		//incoming container filter can be name,id or partial id, convert and replace as a full container id
+		for i, cn := range ef["container"] {
+			ef["container"][i] = getContainerId(cn)
+		}
+
+		if isFiltered(ev.Status, ef["event"]) || isFiltered(ev.From, ef["image"]) ||
+			isFiltered(ev.ID, ef["container"]) {
+			return nil
+		}
+
+		return enc.Encode(ev)
+	}
+
+	current, l := es.Subscribe()
+	defer es.Evict(l)
+	for _, ev := range current {
+		if ev.Time < since {
+			continue
+		}
+		if err := sendEvent(ev); err != nil {
+			return err
+		}
+	}
+	for {
+		select {
+		case ev := <-l:
+			jev, ok := ev.(*jsonmessage.JSONMessage)
+			if !ok {
+				continue
+			}
+			if err := sendEvent(jev); err != nil {
+				return err
+			}
+		case <-timer.C:
+			return nil
+		}
+	}
 }
 
 func getImagesHistory(eng *engine.Engine, version version.Version, w http.ResponseWriter, r *http.Request, vars map[string]string) error {