// main entry point for data writer
func main() {
var err error
var writerSocket *zmq4.Socket
var eventSubSocket *zmq4.Socket
fog.Info("program starts")
if writerSocket, err = createWriterSocket(); err != nil {
fog.Critical("createWriterSocket %s", err)
}
defer writerSocket.Close()
fog.Info("binding writer socket to %s", dataWriterAddress)
if err = writerSocket.Bind(dataWriterAddress); err != nil {
fog.Critical("Bind(%s) %s", dataWriterAddress, err)
}
if eventSubSocket, err = createEventSubSocket(); err != nil {
fog.Critical("createEventSubSocket %s", err)
}
defer eventSubSocket.Close()
fog.Info("connecting event sub socket to %s", eventAggregatorPubAddress)
if err = eventSubSocket.Connect(eventAggregatorPubAddress); err != nil {
fog.Critical("Connect(%s) %s", eventAggregatorPubAddress, err)
}
messageChan := NewMessageHandler()
reactor := zmq4.NewReactor()
reactor.AddChannel(tools.NewSignalWatcher(), 1, tools.SigtermHandler)
reactor.AddSocket(writerSocket, zmq4.POLLIN,
NewWriterSocketHandler(writerSocket, messageChan))
reactor.AddSocket(eventSubSocket, zmq4.POLLIN,
NewEventSubSocketHandler(eventSubSocket))
fog.Debug("starting reactor.Run")
reactor.SetVerbose(true)
err = reactor.Run(reactorPollingInterval)
if err == tools.SigtermError {
fog.Info("program terminates normally due to SIGTERM")
} else if errno, ok := err.(syscall.Errno); ok {
// we can get 'interrupted system call' if we get SIGTERM while
// a socket is waiting on a read. That's not too bad.
if errno == syscall.EINTR {
fog.Warn("reactor.Run returns '%s' assuming SIGTERM", errno)
} else {
fog.Error("reactor.Run returns %T '%s'", errno, errno)
}
} else {
fog.Error("reactor.Run returns %T %s", err, err)
}
}
func testPOST(serviceDomain string, useTLS bool) {
var contentLength uint64 = 1024 * 1024 * 1024
fog.Debug("start post %dmb", contentLength/(1024*1024))
client, scheme := getClient(useTLS)
url := fmt.Sprintf("%s://%s/admin", scheme, serviceDomain)
bodyReader := tools.NewSizeReader(contentLength)
request, err := http.NewRequest("POST", url, bodyReader)
if err != nil {
fog.Critical("NewRequest (POST) failed %s", err)
}
request.TransferEncoding = []string{"identity"}
request.Header.Add("Content-Type", "text/plain")
request.Header.Add("Content-Length", fmt.Sprintf("%s", contentLength))
request.ContentLength = int64(contentLength)
response, err := client.Do(request)
if err != nil {
fog.Error("post %s", err)
return
}
tools.ReadAndDiscard(response.Body)
response.Body.Close()
fog.Debug("finished post %s", response.Status)
}
// sendErrorReply sends an error reply to the client
func sendErrorReply(conn net.Conn, httpCode int, errorMessage string) {
reply := fmt.Sprintf("HTTP/1.0 %d %s\r\n\r\n%s",
httpCode, http.StatusText(httpCode), errorMessage)
if _, err := conn.Write([]byte(reply)); err != nil {
fog.Error("Write error: %s %s", reply, err)
}
}
func handleFinishConjoinedArchive(message types.Message,
nimbusioWriter writer.NimbusioWriter,
replyChan chan<- *reply.ReplyMessage) {
var conjoined msg.Conjoined
var err error
conjoined, err = msg.UnmarshalConjoined(message.Marshalled)
if err != nil {
fog.Error("UnmarshalConjoined failed %s", err)
return
}
replyMessage := reply.NewReplyMessage("finish-conjoined-archive", message.ID,
conjoined.UserRequestID, conjoined.ReturnAddress)
lgr := logger.NewLogger(conjoined.UserRequestID, conjoined.UnifiedID,
0, 0, conjoined.Key)
lgr.Info("finish-conjoined-archive (%d)", conjoined.CollectionID)
if err = nimbusioWriter.FinishConjoinedArchive(conjoined); err != nil {
lgr.Error("StartConjoinedArchive: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
replyMessage.Success()
replyChan <- replyMessage
return
}
func handleDestroyKey(message types.Message,
nimbusioWriter writer.NimbusioWriter,
replyChan chan<- *reply.ReplyMessage) {
var destroyKey msg.DestroyKey
var err error
destroyKey, err = msg.UnmarshalDestroyKey(message.Marshalled)
if err != nil {
fog.Error("UnmarshalDestroyKey failed %s", err)
return
}
replyMessage := reply.NewReplyMessage("destroy-key", message.ID,
destroyKey.UserRequestID, destroyKey.ReturnAddress)
lgr := logger.NewLogger(destroyKey.UserRequestID, destroyKey.UnifiedID,
destroyKey.ConjoinedPart, destroyKey.SegmentNum, destroyKey.Key)
lgr.Info("archive-key-cancel")
if err = nimbusioWriter.DestroyKey(destroyKey); err != nil {
lgr.Error("DestroyKey: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
replyMessage.Success()
replyChan <- replyMessage
return
}
func handleArchiveKeyCancel(message types.Message,
nimbusioWriter writer.NimbusioWriter,
replyChan chan<- *reply.ReplyMessage) {
var archiveKeyCancel msg.ArchiveKeyCancel
var err error
archiveKeyCancel, err = msg.UnmarshalArchiveKeyCancel(message.Marshalled)
if err != nil {
fog.Error("UnmarshalArchiveKeyCancel failed %s", err)
return
}
replyMessage := reply.NewReplyMessage("archive-key-cancel", message.ID,
archiveKeyCancel.UserRequestID, archiveKeyCancel.ReturnAddress)
lgr := logger.NewLogger(archiveKeyCancel.UserRequestID, archiveKeyCancel.UnifiedID,
archiveKeyCancel.ConjoinedPart, archiveKeyCancel.SegmentNum, "")
lgr.Info("archive-key-cancel")
if err = nimbusioWriter.CancelSegment(archiveKeyCancel); err != nil {
lgr.Error("CancelSegment: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
replyMessage.Success()
replyChan <- replyMessage
return
}
func handleSignoff(message types.Message) {
returnAddress, err := msg.UnmarshalReturnAddress(message.Marshalled)
if err != nil {
fog.Error("handleSignoff: unable to unmarshall %s", err)
return
}
fog.Info("signoff from %s", returnAddress.ClientAddress)
}
func handleArchiveKeyNext(message types.Message,
nimbusioWriter writer.NimbusioWriter,
replyChan chan<- *reply.ReplyMessage) {
var archiveKeyNext msg.ArchiveKeyNext
var md5Digest []byte
var err error
archiveKeyNext, err = msg.UnmarshalArchiveKeyNext(message.Marshalled)
if err != nil {
fog.Error("UnmarshalArchiveKeyNext failed %s", err)
return
}
replyMessage := reply.NewReplyMessage("archive-key-final", message.ID,
archiveKeyNext.UserRequestID, archiveKeyNext.ReturnAddress)
lgr := logger.NewLogger(archiveKeyNext.UserRequestID, archiveKeyNext.UnifiedID,
archiveKeyNext.ConjoinedPart, archiveKeyNext.SegmentNum, archiveKeyNext.Key)
lgr.Info("archive-key-Next")
if archiveKeyNext.SegmentSize != uint64(len(message.Data)) {
lgr.Error("size mismatch (%d != %d)", archiveKeyNext.SegmentSize,
len(message.Data))
replyMessage.Error("size-mismatch", "segment size does not match expected value")
replyChan <- replyMessage
return
}
md5Digest, err = base64.StdEncoding.DecodeString(archiveKeyNext.EncodedSegmentMD5Digest)
if err != nil {
lgr.Error("base64.StdEncoding.DecodeString %s", err)
replyMessage.Error("base64", "base64.StdEncoding.DecodeString")
replyChan <- replyMessage
return
}
if !MD5DigestMatches(message.Data, md5Digest) {
lgr.Error("md5 mismatch")
replyMessage.Error("md5-mismatch", "segment md5 does not match expected value")
replyChan <- replyMessage
return
}
_, err = nimbusioWriter.StoreSequence(archiveKeyNext.UserRequestID,
archiveKeyNext.Segment,
archiveKeyNext.Sequence, message.Data)
if err != nil {
lgr.Error("StoreSequence: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
replyMessage.Success()
replyChan <- replyMessage
return
}
func NewReplyHandler() chan<- *ReplyMessage {
replyChan := make(chan *ReplyMessage, replyChanCapacity)
pushSockets := make(map[string]*zmq4.Socket)
go func() {
for replyMessage := range replyChan {
marshalledReply, err := json.Marshal(replyMessage.Content)
if err != nil {
fog.Error("unable to marshall reply %s %s", replyMessage, err)
continue
}
var pushSocket *zmq4.Socket
var ok bool
pushSocket, ok = pushSockets[replyMessage.ClientAddress]
if !ok {
fog.Info("creating PUSH socket to %s", replyMessage.ClientAddress)
if pushSocket, err = createPushSocket(); err != nil {
fog.Error("Unable to create PUSH socket for %s %s",
replyMessage.ClientAddress, err)
continue
}
if err = pushSocket.Connect(replyMessage.ClientAddress); err != nil {
fog.Error("Unable to Connect PUSH socket to %s %s",
replyMessage.ClientAddress, err)
pushSocket.Close()
continue
}
pushSockets[replyMessage.ClientAddress] = pushSocket
}
if _, err = pushSocket.SendMessage(marshalledReply); err != nil {
fog.Error("pushSocket SendMessage to %s failed %s",
replyMessage.ClientAddress, err)
pushSocket.Close()
delete(pushSockets, replyMessage.ClientAddress)
continue
}
}
}()
return replyChan
}
// NewNimbusioWriter returns an entity that implements the NimbusioWriter interface
func NewNimbusioWriter() (NimbusioWriter, error) {
var err error
var state writerState
state.SegmentMap = make(map[segmentKey]segmentMapEntry)
if state.NodeIDMap, err = centraldb.GetNodeIDMap(); err != nil {
return nil, fmt.Errorf("centraldb.GetNodeIDMap() failed %s", err)
}
if state.FileSpaceInfo, err = tools.NewFileSpaceInfo(nodedb.NodeDB); err != nil {
return nil, err
}
if state.ValueFile, err = NewOutputValueFile(state.FileSpaceInfo); err != nil {
return nil, err
}
writerChan := make(chan interface{}, writerChanCapacity)
state.WriterChan = nimbusioWriterChan(writerChan)
if state.StatGrabber, err = gostatgrabber.NewStatGrabber(); err != nil {
return nil, fmt.Errorf("NewStatGrabber failed %s", err)
}
startSyncTimer(&state)
go func() {
for item := range writerChan {
switch request := item.(type) {
case requestSync:
handleSync(&state)
case requestStartSegment:
handleStartSegment(&state, request)
case requestStoreSequence:
handleStoreSequence(&state, request)
case requestCancelSegment:
handleCancelSegment(&state, request)
case requestWaitSyncForFinishSegment:
handleWaitSyncForFinishSegment(&state, request)
case requestFinishSegment:
handleFinishSegment(&state, request)
case requestDestroyKey:
handleDestroyKey(&state, request)
case requestStartConjoinedArchive:
handleStartConjoinedArchive(&state, request)
case requestAbortConjoinedArchive:
handleAbortConjoinedArchive(&state, request)
case requestFinishConjoinedArchive:
handleFinishConjoinedArchive(&state, request)
default:
fog.Error("unknown request type %T", item)
}
}
}()
return state.WriterChan, nil
}
func (s serverImpl) handleAll(w http.ResponseWriter, req *http.Request) {
switch req.Method {
case "GET":
s.handleGET(w, req)
case "POST":
s.handlePOST(w, req)
default:
fog.Error("(%s) unknown method %s %s", s.Name, req.Method, req.URL)
}
}
func handleSync(state *writerState) {
if state.SyncTimer != nil {
state.SyncTimer.Stop()
}
state.SyncTimer = nil
if err := state.ValueFile.Sync(); err != nil {
fog.Error("sync failed %s", err)
}
for _, request := range state.WaitSyncRequests {
state.WriterChan <- request
}
state.WaitSyncRequests = nil
startSyncTimer(state)
}
func NewMessageHandler() chan<- types.Message {
var nimbusioWriter writer.NimbusioWriter
var replyChan chan<- *reply.ReplyMessage
var err error
messageChan := make(chan types.Message, messageChanCapacity)
if err = nodedb.Initialize(); err != nil {
fog.Critical("NewMessageHandler: nodedb.Initialize failed %s", err)
}
if nimbusioWriter, err = writer.NewNimbusioWriter(); err != nil {
fog.Critical("NewMessageHandler: NewNimbusioWriter() failed %s", err)
}
replyChan = reply.NewReplyHandler()
dispatchTable := map[string]messageHandler{
"archive-key-entire": handleArchiveKeyEntire,
"archive-key-start": handleArchiveKeyStart,
"archive-key-next": handleArchiveKeyNext,
"archive-key-final": handleArchiveKeyFinal,
"archive-key-cancel": handleArchiveKeyCancel,
"destroy-key": handleDestroyKey,
"start-conjoined-archive": handleStartConjoinedArchive,
"abort-conjoined-archive": handleAbortConjoinedArchive,
"finish-conjoined-archive": handleFinishConjoinedArchive}
go func() {
for message := range messageChan {
handler, ok := dispatchTable[message.Type]
if !ok {
fog.Error("Unknown message type %s %s",
message.Type, message.Marshalled)
continue
}
go handler(message, nimbusioWriter, replyChan)
}
}()
return messageChan
}
func testGET(serviceDomain string, useTLS bool) {
fog.Debug("start get")
client, scheme := getClient(useTLS)
url := fmt.Sprintf("%s://%s/admin", scheme, serviceDomain)
request, err := http.NewRequest("GET", url, nil)
if err != nil {
fog.Critical("NewRequest (GET) failed %s", err)
}
response, err := client.Do(request)
if err != nil {
fog.Error("get %s", err)
return
}
fog.Debug("reading GET response body")
tools.ReadAndDiscard(response.Body)
response.Body.Close()
fog.Debug("finished get %s", response.Status)
}
// handleConnection manages one HTTP connection
// expected to be run in a goroutine
func handleConnection(router routing.Router, conn net.Conn) {
defer conn.Close()
const bufferSize = 64 * 1024
var err error
requestID, err := tools.CreateUUID()
if err != nil {
fog.Error("%s tools.CreateUUID(): %s", conn.RemoteAddr().String(), err)
return
}
fog.Info("%s starts %s", requestID, conn.RemoteAddr().String())
request, err := http.ReadRequest(bufio.NewReaderSize(conn, bufferSize))
if err != nil {
fog.Error("%s %s ReadRequest failed: %s", requestID,
conn.RemoteAddr().String(), err)
fog.Info("%s aborts", requestID)
return
}
// change the URL to point to our internal host
request.URL.Host, err = router.Route(requestID, request)
if err != nil {
routerErr, ok := err.(routing.RouterError)
if ok {
fog.Error("%s %s, %s router error: %s",
requestID, request.Method, request.URL, err)
sendErrorReply(conn, routerErr.HTTPCode(), routerErr.ErrorMessage())
} else {
fog.Error("%s %s, %s Unexpected error type: %T %s",
requestID, request.Method, request.URL, err, err)
}
fog.Info("%s aborts", requestID)
return
}
request.URL.Scheme = "http"
// heave the incoming RequestURI: can't be set in a client request
request.RequestURI = ""
modifyHeaders(request, conn.RemoteAddr().String(), requestID)
fog.Debug("%s routing %s %s", requestID, request.Method, request.URL)
// TODO: cache the connection to the internal server
internalConn, err := net.Dial("tcp", request.URL.Host)
if err != nil {
fog.Error("%s %s, %s unable to dial internal server: %s",
requestID, request.Method, request.URL, err)
sendErrorReply(conn, http.StatusInternalServerError, err.Error())
fog.Info("%s aborts", requestID)
return
}
defer internalConn.Close()
err = request.Write(bufio.NewWriterSize(internalConn, bufferSize))
if err != nil {
fog.Error("%s %s, %s request.Write: %s",
requestID, request.Method, request.URL, err)
sendErrorReply(conn, http.StatusInternalServerError, err.Error())
fog.Info("%s aborts", requestID)
return
}
request.Body.Close()
response, err := http.ReadResponse(bufio.NewReaderSize(internalConn, bufferSize),
request)
if err != nil {
fog.Error("%s %s, %s http.ReadResponse: %s",
requestID, request.Method, request.URL, err)
sendErrorReply(conn, http.StatusInternalServerError, err.Error())
fog.Info("%s aborts", requestID)
return
}
if err := response.Write(bufio.NewWriterSize(conn, bufferSize)); err != nil {
fog.Error("%s %s, %s error sending response: %s",
requestID, request.Method, request.URL, err)
}
response.Body.Close()
fog.Info("%s ends (%d) %s", requestID, response.StatusCode, response.Status)
}
// Error prepends literal 'ERROR' to log message
// program continues to execute
func (l logData) Error(text string, args ...interface{}) {
fog.Error(l.prefix()+text, args...)
}
func handleArchiveKeyEntire(message types.Message,
nimbusioWriter writer.NimbusioWriter,
replyChan chan<- *reply.ReplyMessage) {
var archiveKeyEntire msg.ArchiveKeyEntire
var md5Digest []byte
var err error
var valueFileID uint32
archiveKeyEntire, err = msg.UnmarshalArchiveKeyEntire(message.Marshalled)
if err != nil {
fog.Error("UnmarshalArchiveKeyEntire failed %s", err)
return
}
replyMessage := reply.NewReplyMessage("archive-key-final", message.ID,
archiveKeyEntire.UserRequestID, archiveKeyEntire.ReturnAddress)
lgr := logger.NewLogger(archiveKeyEntire.UserRequestID, archiveKeyEntire.UnifiedID,
archiveKeyEntire.ConjoinedPart, archiveKeyEntire.SegmentNum, archiveKeyEntire.Key)
lgr.Info("archive-key-entire")
if archiveKeyEntire.SegmentSize != uint64(len(message.Data)) {
lgr.Error("size mismatch (%d != %d)", archiveKeyEntire.SegmentSize,
len(message.Data))
replyMessage.Error("size-mismatch", "segment size does not match expected value")
replyChan <- replyMessage
return
}
md5Digest, err = base64.StdEncoding.DecodeString(archiveKeyEntire.EncodedSegmentMD5Digest)
if err != nil {
lgr.Error("base64.StdEncoding.DecodeString %s", err)
replyMessage.Error("base64", "base64.StdEncoding.DecodeString")
replyChan <- replyMessage
return
}
if !MD5DigestMatches(message.Data, md5Digest) {
lgr.Error("md5 mismatch")
replyMessage.Error("md5-mismatch", "segment md5 does not match expected value")
replyChan <- replyMessage
return
}
err = nimbusioWriter.StartSegment(archiveKeyEntire.UserRequestID, archiveKeyEntire.Segment,
archiveKeyEntire.NodeNames)
if err != nil {
lgr.Error("StartSegment: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
valueFileID, err = nimbusioWriter.StoreSequence(
archiveKeyEntire.UserRequestID,
archiveKeyEntire.Segment,
archiveKeyEntire.Sequence, message.Data)
if err != nil {
lgr.Error("StoreSequence: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
metaData := msg.GetMetaFromJSON(message.Marshalled)
err = nimbusioWriter.FinishSegment(archiveKeyEntire.UserRequestID,
archiveKeyEntire.Segment,
archiveKeyEntire.File,
metaData,
valueFileID)
if err != nil {
lgr.Error("FinishSegment: %s", err)
replyMessage.Error("error", err.Error())
replyChan <- replyMessage
return
}
replyMessage.Success()
replyChan <- replyMessage
return
}
// Route reads a request and decides where it should go <host:port>
func (router *routerImpl) Route(requestID string, req *http.Request) (string, error) {
var err error
hostName := req.Host
router.requestCounter += 1
fog.Debug("%s host=%s, method=%s, URL=%s", requestID, hostName, req.Method,
req.URL)
// TODO: be able to handle http requests from http 1.0 clients w/o a
// host header to at least the website, if nothing else.
if hostName == "" {
return "", routerErrorImpl{httpCode: http.StatusBadRequest,
errorMessage: "HOST header not found"}
}
routingHostName := strings.Split(hostName, ":")[0]
if !strings.HasSuffix(routingHostName, serviceDomain) {
return "", routerErrorImpl{httpCode: http.StatusNotFound,
errorMessage: fmt.Sprintf("Invalid HOST '%s'", routingHostName)}
}
var routingMethod string
var routedHost string
if routingHostName == serviceDomain {
// this is not a request specific to any particular collection
// TODO: figure out how to route these requests.
// in production, this might not matter.
routingMethod = "management API"
routedHost = router.managmentAPIDests.Next()
fog.Debug("%s %s routed to %s by %s", requestID, req.URL.Path,
routedHost, routingMethod)
return routedHost, nil
}
destPort, ok := destPortMap[req.Method]
if !ok {
return "", routerErrorImpl{httpCode: http.StatusBadRequest,
errorMessage: fmt.Sprintf("Unknown method '%s'", req.Method)}
}
collectionName := parseCollectionFromHostName(routingHostName)
if collectionName == "" {
return "", routerErrorImpl{httpCode: http.StatusNotFound,
errorMessage: fmt.Sprintf("Unparseable host name '%s'", hostName)}
}
hostsForCollection, err := router.centralDB.GetHostsForCollection(collectionName)
if err != nil {
fog.Error("database error: collection '%s' %s", collectionName, err)
return "", routerErrorImpl{httpCode: http.StatusInternalServerError,
errorMessage: fmt.Sprintf("database error: collection '%s'",
collectionName)}
}
if len(hostsForCollection) == 0 {
return "", routerErrorImpl{httpCode: http.StatusNotFound,
errorMessage: fmt.Sprintf("no hosts for collection '%s'",
collectionName)}
}
availableHosts, err := router.availability.AvailableHosts(
hostsForCollection, destPort)
if err != nil {
return "", routerErrorImpl{httpCode: http.StatusInternalServerError,
errorMessage: fmt.Sprintf("collection '%s': %s", collectionName, err)}
}
if len(availableHosts) == 0 {
// XXX: the python web_director retries here, after a delay.
// IMO, that's what HTTP Status 503 is for
return "", routerErrorImpl{httpCode: http.StatusServiceUnavailable,
errorMessage: fmt.Sprintf("no hosts available for collection '%s'",
collectionName)}
}
switch {
case alwaysRouteToFirstNode:
routingMethod = "NIMBUSIO_WEB_DIRECTOR_ALWAYS_FIRST_NODE"
routedHost = availableHosts[0]
case (req.Method == "GET" || req.Method == "HEAD") &&
strings.HasPrefix(req.URL.Path, "/data/") &&
len(req.URL.Path) > len("/data/"):
routedHost, err = consistentHashDest(hostsForCollection, availableHosts,
collectionName, req.URL.Path)
if err != nil {
return "", routerErrorImpl{httpCode: http.StatusInternalServerError,
errorMessage: fmt.Sprintf("collection '%s': %s", collectionName, err)}
}
routingMethod = "hash"
default:
if router.roundRobinCounter == 0 {
// start the round robin dispatcher at a random number, so all the
// workers don't start on the same point.
n, err := rand.Int(rand.Reader, big.NewInt(int64(len(hostsForCollection))))
if err != nil {
return "", routerErrorImpl{httpCode: http.StatusInternalServerError,
errorMessage: fmt.Sprintf("collection '%s': %s", collectionName, err)}
}
router.roundRobinCounter = n.Uint64()
} else {
router.roundRobinCounter += 1
}
// XXX: the python version works with hostsForCollection and then tries
// to find one in availableHosts. IMO, assuming the group of
// available hosts is fairly stable, we get the same result working
// strictly with availableHosts
i := int(router.roundRobinCounter % uint64(len(availableHosts)))
routedHost = availableHosts[i]
routingMethod = "round robin"
}
fog.Debug("%s %s %s routed to %s by %s", requestID, collectionName,
req.URL.Path, routedHost, routingMethod)
return fmt.Sprintf("%s:%s", routedHost, destPort), nil
}
// main entry point for webdirector
func main() {
var err error
fog.Info("program starts")
// set up a signal handling channel
signalChannel := make(chan os.Signal)
signal.Notify(signalChannel, os.Interrupt, syscall.SIGTERM)
if profilePath := os.Getenv("WEBDIRECTOR_CPU_PROFILE_PATH"); profilePath != "" {
profileFile, err := os.Create(profilePath)
if err != nil {
fog.Critical("os.Create(%s) failed %s", profilePath, err)
}
fog.Info("writing CPU profile data to %s", profilePath)
pprof.StartCPUProfile(profileFile)
defer pprof.StopCPUProfile()
}
useTLS := os.Getenv("NIMBUS_IO_SERVICE_SSL") == "1"
fog.Info("TLS = %t", useTLS)
listenAddress, err := getListenAddress()
if err != nil {
fog.Critical("error getListenAddress %s", err)
}
fog.Info("webdirector listens to %s", listenAddress)
var listener net.Listener
if useTLS {
if listener, err = getTLSListener(listenAddress); err != nil {
fog.Critical("Unable to create TLS listener: %s", err)
}
} else {
if listener, err = getTCPListener(listenAddress); err != nil {
fog.Critical("Unable to create TCP listener: %s", err)
}
}
managmentAPIDests, err := mgmtapi.NewManagementAPIDestinations()
if err != nil {
fog.Critical("NewManagementAPIDestinations: %s", err)
}
centralDB := centraldb.NewCentralDB()
availableHosts, err := avail.NewAvailability()
if err != nil {
fog.Critical("NewAvailability: %s", err)
}
router := routing.NewRouter(managmentAPIDests, centralDB, availableHosts)
fog.Info("NIMBUS_IO_SERVICE_DOMAIN = '%s'",
os.Getenv("NIMBUS_IO_SERVICE_DOMAIN"))
fog.Info("NIMBUSIO_WEB_PUBLIC_READER_PORT = '%s'",
os.Getenv("NIMBUSIO_WEB_PUBLIC_READER_PORT"))
fog.Info("NIMBUSIO_WEB_WRITER_PORT = '%s'",
os.Getenv("NIMBUSIO_WEB_WRITER_PORT"))
listenerChan := make(chan net.Conn, listenerChanCapacity)
go func() {
for {
connection, err := listener.Accept()
if err != nil {
fog.Error("listener.Accept() %s", err)
close(listenerChan)
break
}
listenerChan <- connection
}
}()
for running := true; running; {
select {
case signal := <-signalChannel:
fog.Info("terminated by signal: %v", signal)
running = false
case conn, ok := <-listenerChan:
if ok {
fog.Info("connection from %s", conn.RemoteAddr().String())
go handleConnection(router, conn)
} else {
running = false
}
}
}
listener.Close()
fog.Info("program terminates")
}
