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events_streamer.go
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// Package handlers :collection of handlers (aka "HTTP middleware")
package handlers
import (
"context"
"fmt"
"io"
"net/http"
"strings"
"sync"
"time"
"encoding/json"
"github.com/gofrs/uuid"
"github.com/gorilla/mux"
"github.com/layer5io/meshery/server/meshes"
"github.com/layer5io/meshery/server/models"
"github.com/layer5io/meshkit/errors"
"github.com/layer5io/meshkit/models/events"
_events "github.com/layer5io/meshkit/utils/events"
"github.com/sirupsen/logrus"
)
var (
flusherMap map[string]http.Flusher
)
type eventStatusPayload struct {
Status string `json:"status"`
StatusIDs []*uuid.UUID `json:"ids"`
}
type statusIDs struct {
IDs []*uuid.UUID `json:"ids"`
}
// swagger:route GET /api/v2/events EventsAPI idGetEventStreamer
// Handle GET request for events.
// ```search={description}``` If search is non empty then a search is performed on event description
// ```?category=[eventcategory] Returns event belonging to provided categories ```
// ```?action=[eventaction] Returns events belonging to provided actions ```
// ```?status={[read/unread]}``` Return events filtered on event status Default is unread````
// ```?severity=[eventseverity] Returns events belonging to provided severities ```
// ```?sort={field} order the records based on passed field, defaults to updated_at```
// ```?order={[asc/desc]}``` Default behavior is desc
// ```?page={page-number}``` Default page number is 1
// ```?pagesize={pagesize}``` Default pagesize is 25. To return all results: ```pagesize=all```
// responses:
// 200: eventsResponseWrapper
func (h *Handler) GetAllEvents(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
userID := uuid.FromStringOrNil(user.ID)
page, offset, limit,
search, order, sortOnCol, status := getPaginationParams(req)
// eventCategory :=
filter, err := getEventFilter(req)
if err != nil {
h.log.Warn(err)
}
filter.Limit = limit
filter.Offset = offset
filter.Order = order
filter.SortOn = sortOnCol
filter.Search = search
filter.Status = events.EventStatus(status)
eventsResult, err := provider.GetAllEvents(filter, userID)
if err != nil {
h.log.Error(ErrGetEvents(err))
http.Error(w, ErrGetEvents(err).Error(), http.StatusInternalServerError)
return
}
eventsResult.Page = page
err = json.NewEncoder(w).Encode(eventsResult)
if err != nil {
h.log.Error(models.ErrMarshal(err, "events response"))
http.Error(w, models.ErrMarshal(err, "events response").Error(), http.StatusInternalServerError)
return
}
}
// swagger:route GET /api/events/types EventsAPI idGetEventStreamer
// Handle GET request for available event categories and actions.
// responses:
// 200:
func (h *Handler) GetEventTypes(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
userID := uuid.FromStringOrNil(user.ID)
eventTypes, err := provider.GetEventTypes(userID)
if err != nil {
http.Error(w, fmt.Errorf("error retrieving event cagegories and actions").Error(), http.StatusInternalServerError)
return
}
err = json.NewEncoder(w).Encode(eventTypes)
if err != nil {
h.log.Error(models.ErrMarshal(err, "event types response"))
http.Error(w, models.ErrMarshal(err, "event types response").Error(), http.StatusInternalServerError)
return
}
}
// swagger:route PUT /api/events/status/{id} idGetEventStreamer
// Handle PUT request to update event status.
// Updates event status for the event associated with the id.
// responses:
// 200: eventResponseWrapper
func (h *Handler) UpdateEventStatus(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
eventID := uuid.FromStringOrNil(mux.Vars(req)["id"])
defer func() {
_ = req.Body.Close()
}()
var reqBody map[string]interface{}
body, err := io.ReadAll(req.Body)
if err != nil {
h.log.Error(ErrRequestBody(err))
http.Error(w, ErrRequestBody(err).Error(), http.StatusInternalServerError)
return
}
_ = json.Unmarshal(body, &reqBody)
status, ok := reqBody["status"].(string)
if !ok {
h.log.Error(ErrUpdateEvent(fmt.Errorf("unable to parse provided event status %s", status), eventID.String()))
http.Error(w, ErrUpdateEvent(fmt.Errorf("unable to parse provided event status %s", status), eventID.String()).Error(), http.StatusInternalServerError)
return
}
event, err := provider.UpdateEventStatus(eventID, status)
if err != nil {
_err := ErrUpdateEvent(err, eventID.String())
h.log.Error(_err)
http.Error(w, _err.Error(), http.StatusInternalServerError)
return
}
err = json.NewEncoder(w).Encode(event)
if err != nil {
h.log.Error(err)
http.Error(w, models.ErrMarshal(err, "event response").Error(), http.StatusInternalServerError)
return
}
}
// swagger:route PUT /api/events/status idGetEventStreamer
// Handle PUT request to update event status in bulk.
// Bulk update status for the events associated with the ids.
// responses:
// 200: eventResponseWrapper
func (h *Handler) BulkUpdateEventStatus(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
defer func() {
_ = req.Body.Close()
}()
var reqBody eventStatusPayload
body, err := io.ReadAll(req.Body)
if err != nil {
h.log.Error(ErrRequestBody(err))
http.Error(w, ErrRequestBody(err).Error(), http.StatusInternalServerError)
return
}
_ = json.Unmarshal(body, &reqBody)
event, err := provider.BulkUpdateEventStatus(reqBody.StatusIDs, reqBody.Status)
if err != nil {
_err := ErrBulkUpdateEvent(err)
h.log.Error(_err)
http.Error(w, _err.Error(), http.StatusInternalServerError)
return
}
err = json.NewEncoder(w).Encode(event)
if err != nil {
h.log.Error(err)
http.Error(w, models.ErrMarshal(err, "event response").Error(), http.StatusInternalServerError)
return
}
}
// swagger:route DELETE /api/events/bulk idGetEventStreamer
// Handle DELETE request to delete events in bulk.
// Bulk delete events associated with the ids.
// responses:
// 200:
func (h *Handler) BulkDeleteEvent(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
defer func() {
_ = req.Body.Close()
}()
var reqBody statusIDs
body, err := io.ReadAll(req.Body)
if err != nil {
h.log.Error(ErrRequestBody(err))
http.Error(w, ErrRequestBody(err).Error(), http.StatusInternalServerError)
return
}
_ = json.Unmarshal(body, &reqBody)
err = provider.BulkDeleteEvent(reqBody.IDs)
if err != nil {
_err := ErrBulkDeleteEvent(err)
h.log.Error(_err)
http.Error(w, _err.Error(), http.StatusInternalServerError)
return
}
}
// swagger:route DELETE /api/events/{id} idGetEventStreamer
// Handle DELETE request for events.
// Deletes event associated with the id.
// responses:
// 200:
func (h *Handler) DeleteEvent(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, provider models.Provider) {
eventID := uuid.FromStringOrNil(mux.Vars(req)["id"])
err := provider.DeleteEvent(eventID)
if err != nil {
_err := ErrDeleteEvent(err, eventID.String())
h.log.Error(_err)
http.Error(w, _err.Error(), http.StatusInternalServerError)
return
}
}
func getEventFilter(req *http.Request) (*events.EventsFilter, error) {
urlValues := req.URL.Query()
category := urlValues.Get("category")
action := urlValues.Get("action")
severity := urlValues.Get("severity")
eventFilter := &events.EventsFilter{}
if category != "" {
err := json.Unmarshal([]byte(category), &eventFilter.Category)
if err != nil {
return eventFilter, models.ErrUnmarshal(err, "event category filter")
}
}
if action != "" {
err := json.Unmarshal([]byte(action), &eventFilter.Action)
if err != nil {
return eventFilter, models.ErrUnmarshal(err, "event action filter")
}
}
if severity != "" {
err := json.Unmarshal([]byte(severity), &eventFilter.Severity)
if err != nil {
return eventFilter, models.ErrUnmarshal(err, "event severity filter")
}
}
return eventFilter, nil
}
// swagger:route GET /api/events EventsAPI idGetEventStreamer
// Handle GET request for events.
// Listens for events across all of Meshery's components like adapters and server, streaming them to the UI via Server Side Events
// This API call never terminates and establishes a persistent keep-alive connection over which `EventsResponse`s are pushed.
// responses:
// 200:
// EventStreamHandler endpoint is used for streaming events to the frontend
func (h *Handler) EventStreamHandler(w http.ResponseWriter, req *http.Request, prefObj *models.Preference, user *models.User, p models.Provider) {
// if req.Method != http.MethodGet {
// w.WriteHeader(http.StatusNotFound)
// return
// }
log := logrus.WithField("file", "events_streamer")
client := "ui"
if req.URL.Query().Get("client") != "" {
client = req.URL.Query().Get("client")
}
if flusherMap == nil {
flusherMap = make(map[string]http.Flusher, 0)
}
flusher, ok := w.(http.Flusher)
flusherMap[client] = flusher
if !ok {
log.Error("Event streaming not supported.")
http.Error(w, "Event streaming is not supported at the moment.", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
w.Header().Set("Access-Control-Allow-Origin", "*")
notify := req.Context()
var err error
localMeshAdapters := map[string]*meshes.MeshClient{}
localMeshAdaptersLock := &sync.Mutex{}
respChan := make(chan []byte, 100)
newAdaptersChan := make(chan *meshes.MeshClient)
go func() {
for mClient := range newAdaptersChan {
log.Debug("received a new mesh client, listening for events")
go func(mClient *meshes.MeshClient) {
listenForAdapterEvents(req.Context(), mClient, respChan, log, p, h.config.EventBroadcaster, *h.SystemID, user.ID)
_ = mClient.Close()
}(mClient)
}
log.Debug("new adapters channel closed")
}()
go listenForCoreEvents(req.Context(), h.EventsBuffer, respChan, log, p)
go func(flusher http.Flusher) {
for data := range respChan {
log.Debug("received new data on response channel")
_, _ = fmt.Fprintf(w, "data: %s\n\n", data)
if flusher != nil {
flusher.Flush()
log.Debugf("Flushed the messages on the wire...")
}
}
log.Debug("response channel closed")
}(flusherMap[client])
STOP:
for {
select {
case <-notify.Done():
log.Debugf("received signal to close connection and channels")
close(newAdaptersChan)
break STOP
default:
meshAdapters := prefObj.MeshAdapters
if meshAdapters == nil {
meshAdapters = []*models.Adapter{}
}
adaptersLen := len(meshAdapters)
if adaptersLen == 0 {
// Clear the adapter cache
localMeshAdapters = closeAdapterConnections(localMeshAdaptersLock, localMeshAdapters)
} else {
localMeshAdaptersLock.Lock()
for _, ma := range meshAdapters {
mClient, ok := localMeshAdapters[ma.Location]
if !ok {
mClient, err = meshes.CreateClient(req.Context(), ma.Location)
if err == nil {
localMeshAdapters[ma.Location] = mClient
}
}
if mClient != nil {
_, err = mClient.MClient.MeshName(req.Context(), &meshes.MeshNameRequest{})
if err != nil {
_ = mClient.Close()
delete(localMeshAdapters, ma.Location)
} else {
if !ok { // reusing the map check, only when ok is false a new entry will be added
newAdaptersChan <- mClient
}
}
}
}
localMeshAdaptersLock.Unlock()
}
}
time.Sleep(5 * time.Second)
}
close(respChan)
defer log.Debug("events handler closed")
}
func listenForCoreEvents(ctx context.Context, eb *_events.EventStreamer, resp chan []byte, log *logrus.Entry, _ models.Provider) {
datach := make(chan interface{}, 10)
go eb.Subscribe(datach)
for {
select {
case datap := <-datach:
event, ok := datap.(*meshes.EventsResponse)
if !ok {
continue
}
data, err := json.Marshal(event)
if err != nil {
log.Error(models.ErrMarshal(err, "event"))
continue
}
resp <- data
case <-ctx.Done():
return
}
}
}
func listenForAdapterEvents(ctx context.Context, mClient *meshes.MeshClient, respChan chan []byte, log *logrus.Entry, p models.Provider, ec *models.Broadcast, systemID uuid.UUID, userID string) {
log.Debugf("Received a stream client...")
userUUID := uuid.FromStringOrNil(userID)
streamClient, err := mClient.MClient.StreamEvents(ctx, &meshes.EventsRequest{})
if err != nil {
log.Error(ErrStreamEvents(err))
// errChan <- err
// http.Error(w, "There was an error connecting to the backend to get events", http.StatusInternalServerError)
return
}
for {
log.Debugf("Waiting to receive events.")
event, err := streamClient.Recv()
if err != nil {
if err == io.EOF {
log.Error(ErrStreamClient(err))
return
}
log.Error(ErrStreamClient(err))
return
}
// log.Debugf("received an event: %+#v", event)
log.Debugf("Received an event.")
eventType := event.EventType.String()
eventBuilder := events.NewEvent().FromSystem(uuid.FromStringOrNil(event.Component)).
WithSeverity(events.Informational).WithDescription(event.Summary).WithCategory(event.ComponentName).WithAction("deploy").FromUser(userUUID)
if strings.Contains(event.Summary, "removed") {
eventBuilder.WithAction("undeploy")
}
if strings.Contains(event.Summary, "Smi conformance test") {
result := &models.SmiResult{}
err := json.Unmarshal([]byte(event.Details), result)
if err != nil {
log.Error(models.ErrUnmarshal(err, "event"))
return
}
id, err := p.PublishSmiResults(result)
if err != nil {
log.Error(ErrPublishSmiResults(err))
return
}
event.Details = fmt.Sprintf("Result-Id: %s", id)
}
if eventType == "ERROR" {
err := errors.New(event.ErrorCode, errors.Alert, []string{event.Summary}, []string{event.Details}, []string{event.ProbableCause}, []string{event.SuggestedRemediation})
eventBuilder.WithMetadata(map[string]interface{}{
"error": err,
})
}
_event := eventBuilder.Build()
_ = p.PersistEvent(_event)
ec.Publish(userUUID, _event)
data, err := json.Marshal(event)
if err != nil {
log.Error(models.ErrMarshal(err, "event"))
return
}
respChan <- data
}
}
func closeAdapterConnections(localMeshAdaptersLock *sync.Mutex, localMeshAdapters map[string]*meshes.MeshClient) map[string]*meshes.MeshClient {
localMeshAdaptersLock.Lock()
for _, mcl := range localMeshAdapters {
_ = mcl.Close()
}
localMeshAdaptersLock.Unlock()
return map[string]*meshes.MeshClient{}
}