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event_handlers.go
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/
event_handlers.go
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// Copyright 2017 VMware, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handlers
import (
"encoding/json"
"fmt"
"io"
log "github.com/Sirupsen/logrus"
"github.com/go-openapi/runtime/middleware"
"github.com/vmware/vic/lib/apiservers/portlayer/restapi/operations"
"github.com/vmware/vic/lib/apiservers/portlayer/restapi/operations/events"
ple "github.com/vmware/vic/lib/portlayer/event/events"
"github.com/vmware/vic/lib/portlayer/exec"
"github.com/vmware/vic/pkg/trace"
"github.com/vmware/vic/pkg/uid"
)
// EventHandlerImpl is the receiver for all of the event handler methods
type EventsHandlerImpl struct {
handlerCtx *HandlerContext
}
// Configure assigns functions to all the exec api handlers
func (handler *EventsHandlerImpl) Configure(api *operations.PortLayerAPI, handlerCtx *HandlerContext) {
api.EventsGetEventsHandler = events.GetEventsHandlerFunc(handler.GetEventsHandler)
handler.handlerCtx = handlerCtx
}
// GetEventsHandler provides a stream of events
func (handler *EventsHandlerImpl) GetEventsHandler(params events.GetEventsParams) middleware.Responder {
defer trace.End(trace.Begin(""))
r, w := io.Pipe()
enc := json.NewEncoder(w)
flusher := NewFlushingReader(r)
// uid for subscription
id := uid.New().String()
sub := fmt.Sprintf("%s-%s", "PLE", id)
// currently only containerEvents will be streamed
topic := ple.NewEventType(ple.ContainerEvent{}).Topic()
// func to clean up the event stream
onClose := func() {
exec.Config.EventManager.Unsubscribe(topic, sub)
closePipe(r, w)
}
// subscribe to event stream
exec.Config.EventManager.Subscribe(topic, sub, func(ie ple.Event) {
err := enc.Encode(ie)
if err != nil {
log.Errorf("Encoding Error: %s", err.Error())
exec.Config.EventManager.Unsubscribe(topic, sub)
closePipe(r, w)
}
})
return NewStreamOutputHandler("events").WithPayload(flusher, sub, onClose)
}