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server_udp.go
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server_udp.go
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package internal
import (
"context"
"net"
"strconv"
"github.com/greenstatic/openspa/internal/observability"
"github.com/greenstatic/openspa/pkg/openspalib"
"github.com/greenstatic/openspa/pkg/openspalib/crypto"
"github.com/pkg/errors"
"github.com/rs/zerolog/log"
)
const readRequestBufferSize = openspalib.MaxPDUSize
type Server struct {
udpServer *UDPServer
httpServer *HTTPServer
handler UDPDatagramRequestHandler
reqCoord *RequestCoordinator
frm *FirewallRuleManager
settings ServerSettings
}
const NoRequestHandlersDefault = 100
type ServerSettings struct {
UDPServerIP net.IP
UDPServerPort int
NoRequestHandlers int
FW Firewall
CS crypto.CipherSuite
Authz AuthorizationStrategy
// HTTP server parameters, if HTTPServerPort is 0, the HTTP server will not be started
HTTPServerIP net.IP
HTTPServerPort int
// Optional
ADKSecret string
}
func NewServer(set ServerSettings) *Server {
frm := NewFirewallRuleManager(set.FW)
h := NewServerHandler(frm, set.CS, set.Authz, ServerHandlerOpt{ADKSecret: set.ADKSecret})
var handler UDPDatagramRequestHandler
var rc *RequestCoordinator
if set.NoRequestHandlers > 0 {
rc = NewRequestCoordinator(h, set.NoRequestHandlers)
handler = rc
} else {
handler = &datagramRequestHandlerUnbound{h}
}
var httpServer *HTTPServer
if set.HTTPServerPort != 0 {
httpServer = NewHTTPServer(set.HTTPServerIP, set.HTTPServerPort)
}
s := &Server{
udpServer: NewUDPServer(set.UDPServerIP, set.UDPServerPort, handler),
httpServer: httpServer,
handler: handler,
reqCoord: rc,
settings: set,
frm: frm,
}
return s
}
func (s *Server) Start() error {
if err := s.frm.fw.FirewallSetup(); err != nil {
log.Fatal().Err(err).Msgf("Failed to setup firewall")
}
if err := s.frm.Start(); err != nil {
log.Fatal().Err(err).Msgf("Failed to start firewall rule manager")
}
if s.httpServer != nil {
go func() {
if err := s.httpServer.Start(); err != nil {
log.Fatal().Err(err).Msgf("HTTP server crashed")
}
}()
}
bind := net.JoinHostPort(s.settings.UDPServerIP.String(), strconv.Itoa(s.settings.UDPServerPort))
rc := s.reqCoord != nil // do we have a request coordinator?
log.Info().Msgf("Starting UDP server (ADK support: %t, request coordinator: %t): %s", s.handler.ADKSupport(), rc, bind)
if s.reqCoord != nil {
s.reqCoord.Start()
}
return s.udpServer.Start()
}
func (s *Server) Stop() error {
// s.reqCoord.Stop() // TODO
if s.httpServer != nil {
if err := s.httpServer.Stop(); err != nil {
log.Error().Err(err).Msgf("Failed to stop HTTP server")
}
}
if err := s.udpServer.Stop(); err != nil {
return errors.Wrap(err, "udp server stop")
}
if err := s.frm.Stop(); err != nil {
return errors.Wrap(err, "firewall rule manager stop")
}
return nil
}
type UDPServer struct {
IP net.IP
Port int
handler UDPDatagramRequestHandler
c *net.UDPConn
metrics udpServerMetrics
}
type udpServerMetrics struct {
datagramRX observability.Counter
datagramTX observability.Counter
}
func NewUDPServer(ip net.IP, port int, reqHandle UDPDatagramRequestHandler) *UDPServer {
u := &UDPServer{
IP: ip,
Port: port,
handler: reqHandle,
metrics: newUDPServerMetrics(),
}
return u
}
func (u *UDPServer) Start() error {
return u.start()
}
func (u *UDPServer) start() error {
lAddr := &net.UDPAddr{
IP: u.IP,
Port: u.Port,
}
c, err := net.ListenUDP("udp", lAddr)
if err != nil {
return errors.Wrap(err, "listen packet stopped")
}
u.c = c
responder := NewUDPResponse(c, u.metrics)
defer c.Close()
b := make([]byte, readRequestBufferSize)
for {
n, rAddr, err := c.ReadFromUDP(b)
if err != nil {
if errors.Is(err, net.ErrClosed) {
break
}
return errors.Wrap(err, "failed to read from udp con")
}
u.metrics.datagramRX.Inc()
bCpy := make([]byte, n)
copy(bCpy, b)
ctx := context.Background()
u.handler.DatagramRequestHandler(ctx, responder, DatagramRequest{
data: bCpy,
rAddr: *rAddr,
})
}
return nil
}
func (u *UDPServer) Stop() error {
return u.stop()
}
func (u *UDPServer) stop() error {
if u.c != nil {
if err := u.c.Close(); err != nil {
return err
}
}
return nil
}
func newUDPServerMetrics() udpServerMetrics {
m := udpServerMetrics{}
mr := getMetricsRepository()
lbl := observability.NewLabels()
m.datagramRX = mr.Count("udp_server_rx", lbl)
m.datagramTX = mr.Count("udp_server_tx", lbl)
return m
}
type DatagramRequest struct {
data []byte
rAddr net.UDPAddr
}
type UDPDatagramRequestHandler interface {
DatagramRequestHandler(ctx context.Context, resp UDPResponser, r DatagramRequest)
ADKSupport() bool
}
var _ UDPDatagramRequestHandler = &RequestCoordinator{}
type RequestCoordinator struct {
reqHandler UDPDatagramRequestHandler
queue chan QueuedDatagramRequest
noHandlers int
started bool
}
type QueuedDatagramRequest struct {
DatagramRequest
resp UDPResponser
ctx context.Context
}
func NewRequestCoordinator(h UDPDatagramRequestHandler, handlers int) *RequestCoordinator {
d := &RequestCoordinator{
reqHandler: h,
queue: make(chan QueuedDatagramRequest),
noHandlers: handlers,
started: false,
}
return d
}
func (d *RequestCoordinator) Start() {
if !d.started {
d.startHandlers(d.queue, d.noHandlers)
}
}
func (d *RequestCoordinator) DatagramRequestHandler(ctx context.Context, resp UDPResponser, r DatagramRequest) {
d.queue <- QueuedDatagramRequest{ctx: ctx, DatagramRequest: r, resp: resp}
}
func (d *RequestCoordinator) ADKSupport() bool {
return d.reqHandler.ADKSupport()
}
// startHandlers spawns size handler(), each in a goroutine.
func (d *RequestCoordinator) startHandlers(queue chan QueuedDatagramRequest, size int) {
for i := 0; i < size; i++ {
go d.handler(queue)
}
}
func (d *RequestCoordinator) handler(queue chan QueuedDatagramRequest) {
for r := range queue {
if d.reqHandler != nil {
d.reqHandler.DatagramRequestHandler(r.ctx, r.resp, r.DatagramRequest)
}
}
}
// datagramRequestHandlerUnbound spawns each DatagramRequestHandler in its own goroutine. This is dangerous
// since we spawn goroutines without any limit.
type datagramRequestHandlerUnbound struct {
UDPDatagramRequestHandler
}
//nolint:lll
func (d *datagramRequestHandlerUnbound) DatagramRequestHandler(ctx context.Context, resp UDPResponser, r DatagramRequest) {
go d.UDPDatagramRequestHandler.DatagramRequestHandler(ctx, resp, r)
}