From 150bba462ee225c9c8f42e491984ea865dd51488 Mon Sep 17 00:00:00 2001
From: Marcin Maciaszczyk <Marcin.Maciaszczyk@ts.fujitsu.com>
Date: Mon, 30 Nov 2015 11:22:22 +0100
Subject: [PATCH] Implemented backend events API

---
 src/app/backend/apihandler.go | 21 ++++++++-
 src/app/backend/events.go     | 89 +++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+), 1 deletion(-)
 create mode 100644 src/app/backend/events.go

diff --git a/src/app/backend/apihandler.go b/src/app/backend/apihandler.go
index ea0f11d5c..e3b4dd8ea 100644
--- a/src/app/backend/apihandler.go
+++ b/src/app/backend/apihandler.go
@@ -74,6 +74,15 @@ func CreateHttpApiHandler(client *client.Client) http.Handler {
 			Writes(Logs{}))
 	wsContainer.Add(logsWs)
 
+	eventsWs := new(restful.WebService)
+	eventsWs.Path("/api/events").
+		Produces(restful.MIME_JSON)
+	eventsWs.Route(
+		eventsWs.GET("/{namespace}").
+			To(apiHandler.handleEvents).
+			Writes(Events{}))
+	wsContainer.Add(eventsWs)
+
 	return wsContainer
 }
 
@@ -155,7 +164,6 @@ func (apiHandler *ApiHandler) handleGetNamespaces(
 
 // Handles log API call.
 func (apiHandler *ApiHandler) handleLogs(request *restful.Request, response *restful.Response) {
-
 	namespace := request.PathParameter("namespace")
 	podId := request.PathParameter("podId")
 	result, err := GetPodLogs(apiHandler.client, namespace, podId)
@@ -166,6 +174,17 @@ func (apiHandler *ApiHandler) handleLogs(request *restful.Request, response *res
 	response.WriteHeaderAndEntity(http.StatusCreated, result)
 }
 
+// Handles event API call.
+func (apiHandler *ApiHandler) handleEvents(request *restful.Request, response *restful.Response) {
+	namespace := request.PathParameter("namespace")
+	result, err := GetEvents(apiHandler.client, namespace)
+	if err != nil {
+		handleInternalError(response, err)
+		return
+	}
+	response.WriteHeaderAndEntity(http.StatusCreated, result)
+}
+
 // Handler that writes the given error to the response and sets appropriate HTTP status headers.
 func handleInternalError(response *restful.Response, err error) {
 	response.AddHeader("Content-Type", "text/plain")
diff --git a/src/app/backend/events.go b/src/app/backend/events.go
new file mode 100644
index 000000000..8416ac4cc
--- /dev/null
+++ b/src/app/backend/events.go
@@ -0,0 +1,89 @@
+// Copyright 2015 Google 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 main
+
+import (
+	"k8s.io/kubernetes/pkg/api/unversioned"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+// Events response structure.
+type Events struct {
+	// Namespace.
+	Namespace string `json:"namespace"`
+
+	// List of events from given namespace.
+	Events []Event `json:"events"`
+}
+
+// Single event representation.
+type Event struct {
+	// Event message.
+	Message string `json:"message"`
+
+	// Component from which the event is generated.
+	SourceComponent string `json:"sourceComponent"`
+
+	// Host name on which the event is generated.
+	SourceHost string `json:"sourceHost"`
+
+	// Reference to a piece of an object, which triggered an event. For example
+	// "spec.containers{name}" refers to container within pod with given name, if no container
+	// name is specified, for example "spec.containers[2]", then it refers to container with
+	// index 2 in this pod.
+	SubObject string `json:"object"`
+
+	// The number of times this event has occurred.
+	Count int `json:"count"`
+
+	// The time at which the event was first recorded.
+	FirstSeen unversioned.Time `json:"firstSeen"`
+
+	// The time at which the most recent occurrence of this event was recorded.
+	LastSeen unversioned.Time `json:"lastSeen"`
+
+	// Reason why this event was generated.
+	Reason string `json:"reason"`
+}
+
+// Return events for particular namespace or error if occurred.
+func GetEvents(client *client.Client, namespace string) (*Events, error) {
+	list, err := client.Events(namespace).List(labels.Everything(), fields.Everything())
+
+	if err != nil {
+		return nil, err
+	}
+
+	events := &Events{
+		Namespace: namespace,
+	}
+
+	for _, element := range list.Items {
+		events.Events = append(events.Events, Event{
+			Message:         element.Message,
+			SourceComponent: element.Source.Component,
+			SourceHost:      element.Source.Host,
+			SubObject:       element.InvolvedObject.FieldPath,
+			Count:           element.Count,
+			FirstSeen:       element.FirstTimestamp,
+			LastSeen:        element.LastTimestamp,
+			Reason:          element.Reason,
+		})
+	}
+
+	return events, nil
+}
-- 
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