forked from canonical/lxd
/
events.go
145 lines (113 loc) · 2.78 KB
/
events.go
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package main
import (
"encoding/json"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/pborman/uuid"
log "gopkg.in/inconshreveable/log15.v2"
"github.com/lxc/lxd/shared"
)
type eventsHandler struct {
}
func logContextMap(ctx []interface{}) map[string]string {
var key string
ctxMap := map[string]string{}
for _, entry := range ctx {
if key == "" {
key = entry.(string)
} else {
ctxMap[key] = fmt.Sprintf("%s", entry)
key = ""
}
}
return ctxMap
}
func (h eventsHandler) Log(r *log.Record) error {
eventSend("logging", shared.Jmap{
"message": r.Msg,
"level": r.Lvl.String(),
"context": logContextMap(r.Ctx)})
return nil
}
var eventsLock sync.Mutex
var eventListeners map[string]*eventListener = make(map[string]*eventListener)
type eventListener struct {
connection *websocket.Conn
messageTypes []string
active chan bool
id string
msgLock sync.Mutex
}
type eventsServe struct {
req *http.Request
}
func (r *eventsServe) Render(w http.ResponseWriter) error {
return eventsSocket(r.req, w)
}
func (r *eventsServe) String() string {
return "event handler"
}
func eventsSocket(r *http.Request, w http.ResponseWriter) error {
listener := eventListener{}
typeStr := r.FormValue("type")
if typeStr == "" {
typeStr = "logging,operation"
}
c, err := shared.WebsocketUpgrader.Upgrade(w, r, nil)
if err != nil {
return err
}
listener.active = make(chan bool, 1)
listener.connection = c
listener.id = uuid.NewRandom().String()
listener.messageTypes = strings.Split(typeStr, ",")
eventsLock.Lock()
eventListeners[listener.id] = &listener
eventsLock.Unlock()
shared.LogDebugf("New events listener: %s", listener.id)
<-listener.active
eventsLock.Lock()
delete(eventListeners, listener.id)
eventsLock.Unlock()
listener.connection.Close()
shared.LogDebugf("Disconnected events listener: %s", listener.id)
return nil
}
func eventsGet(d *Daemon, r *http.Request) Response {
return &eventsServe{r}
}
var eventsCmd = Command{name: "events", get: eventsGet}
func eventSend(eventType string, eventMessage interface{}) error {
event := shared.Jmap{}
event["type"] = eventType
event["timestamp"] = time.Now()
event["metadata"] = eventMessage
body, err := json.Marshal(event)
if err != nil {
return err
}
eventsLock.Lock()
listeners := eventListeners
for _, listener := range listeners {
if !shared.StringInSlice(eventType, listener.messageTypes) {
continue
}
go func(listener *eventListener, body []byte) {
if listener == nil {
return
}
listener.msgLock.Lock()
err = listener.connection.WriteMessage(websocket.TextMessage, body)
listener.msgLock.Unlock()
if err != nil {
listener.active <- false
}
}(listener, body)
}
eventsLock.Unlock()
return nil
}