285 lines
8.5 KiB
Go
285 lines
8.5 KiB
Go
package connection
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/cloudflare/cloudflared/cmd/cloudflared/buildinfo"
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"github.com/cloudflare/cloudflared/h2mux"
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"github.com/cloudflare/cloudflared/tunnelrpc/pogs"
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"github.com/google/uuid"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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const (
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quickStartLink = "https://developers.cloudflare.com/argo-tunnel/quickstart/"
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faqLink = "https://developers.cloudflare.com/argo-tunnel/faq/"
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)
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// EdgeManager manages connections with the edge
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type EdgeManager struct {
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// streamHandler handles stream opened by the edge
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streamHandler h2mux.MuxedStreamHandler
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// TLSConfig is the TLS configuration to connect with edge
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tlsConfig *tls.Config
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// cloudflaredConfig is the cloudflared configuration that is determined when the process first starts
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cloudflaredConfig *CloudflaredConfig
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// serviceDiscoverer returns the next edge addr to connect to
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serviceDiscoverer EdgeServiceDiscoverer
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// state is attributes of ConnectionManager that can change during runtime.
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state *edgeManagerState
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logger *logrus.Entry
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}
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// EdgeConnectionManagerConfigurable is the configurable attributes of a EdgeConnectionManager
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type EdgeManagerConfigurable struct {
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TunnelHostnames []h2mux.TunnelHostname
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*pogs.EdgeConnectionConfig
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}
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type CloudflaredConfig struct {
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CloudflaredID uuid.UUID
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Tags []pogs.Tag
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BuildInfo *buildinfo.BuildInfo
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Scope pogs.Scope
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}
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func NewEdgeManager(
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streamHandler h2mux.MuxedStreamHandler,
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edgeConnMgrConfigurable *EdgeManagerConfigurable,
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userCredential []byte,
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tlsConfig *tls.Config,
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serviceDiscoverer EdgeServiceDiscoverer,
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cloudflaredConfig *CloudflaredConfig,
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logger *logrus.Logger,
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) *EdgeManager {
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return &EdgeManager{
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streamHandler: streamHandler,
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tlsConfig: tlsConfig,
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cloudflaredConfig: cloudflaredConfig,
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serviceDiscoverer: serviceDiscoverer,
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state: newEdgeConnectionManagerState(edgeConnMgrConfigurable, userCredential),
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logger: logger.WithField("subsystem", "connectionManager"),
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}
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}
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func (em *EdgeManager) Run(ctx context.Context) error {
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defer em.shutdown()
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resolveEdgeIPTicker := time.Tick(resolveEdgeAddrTTL)
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for {
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select {
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case <-ctx.Done():
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return errors.Wrap(ctx.Err(), "EdgeConnectionManager terminated")
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case <-resolveEdgeIPTicker:
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if err := em.serviceDiscoverer.Refresh(); err != nil {
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em.logger.WithError(err).Warn("Cannot refresh Cloudflare edge addresses")
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}
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default:
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time.Sleep(1 * time.Second)
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}
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// Create/delete connection one at a time, so we don't need to adjust for connections that are being created/deleted
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// in shouldCreateConnection or shouldReduceConnection calculation
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if em.state.shouldCreateConnection(em.serviceDiscoverer.AvailableAddrs()) {
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if err := em.newConnection(ctx); err != nil {
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em.logger.WithError(err).Error("cannot create new connection")
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}
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} else if em.state.shouldReduceConnection() {
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if err := em.closeConnection(ctx); err != nil {
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em.logger.WithError(err).Error("cannot close connection")
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}
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}
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}
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}
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func (em *EdgeManager) UpdateConfigurable(newConfigurable *EdgeManagerConfigurable) {
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em.logger.Infof("New edge connection manager configuration %+v", newConfigurable)
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em.state.updateConfigurable(newConfigurable)
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}
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func (em *EdgeManager) newConnection(ctx context.Context) error {
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edgeIP := em.serviceDiscoverer.Addr()
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edgeConn, err := em.dialEdge(ctx, edgeIP)
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if err != nil {
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return errors.Wrap(err, "dial edge error")
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}
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configurable := em.state.getConfigurable()
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// Establish a muxed connection with the edge
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// Client mux handshake with agent server
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muxer, err := h2mux.Handshake(edgeConn, edgeConn, h2mux.MuxerConfig{
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Timeout: configurable.Timeout,
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Handler: em.streamHandler,
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IsClient: true,
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HeartbeatInterval: configurable.HeartbeatInterval,
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MaxHeartbeats: configurable.MaxFailedHeartbeats,
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Logger: em.logger.WithField("subsystem", "muxer"),
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})
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if err != nil {
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return errors.Wrap(err, "couldn't perform handshake with edge")
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}
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h2muxConn, err := newConnection(muxer, edgeIP)
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if err != nil {
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return errors.Wrap(err, "couldn't create h2mux connection")
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}
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go em.serveConn(ctx, h2muxConn)
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connResult, err := h2muxConn.Connect(ctx, &pogs.ConnectParameters{
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CloudflaredID: em.cloudflaredConfig.CloudflaredID,
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CloudflaredVersion: em.cloudflaredConfig.BuildInfo.CloudflaredVersion,
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NumPreviousAttempts: 0,
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OriginCert: em.state.getUserCredential(),
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Scope: em.cloudflaredConfig.Scope,
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Tags: em.cloudflaredConfig.Tags,
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}, em.logger)
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if err != nil {
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h2muxConn.Shutdown()
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return errors.Wrap(err, "couldn't connect to edge")
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}
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if connErr := connResult.Err; connErr != nil {
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if !connErr.ShouldRetry {
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return errors.Wrap(connErr, em.noRetryMessage())
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}
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return errors.Wrapf(connErr, "edge responded with RetryAfter=%v", connErr.RetryAfter)
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}
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em.state.newConnection(h2muxConn)
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em.logger.Infof("connected to %s", connResult.ServerInfo.LocationName)
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return nil
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}
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func (em *EdgeManager) closeConnection(ctx context.Context) error {
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conn := em.state.getFirstConnection()
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if conn == nil {
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return fmt.Errorf("no connection to close")
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}
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conn.Shutdown()
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return nil
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}
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func (em *EdgeManager) serveConn(ctx context.Context, conn *Connection) {
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err := conn.Serve(ctx)
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em.logger.WithError(err).Warn("Connection closed")
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em.state.closeConnection(conn)
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}
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func (em *EdgeManager) dialEdge(ctx context.Context, edgeIP *net.TCPAddr) (*tls.Conn, error) {
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timeout := em.state.getConfigurable().Timeout
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// Inherit from parent context so we can cancel (Ctrl-C) while dialing
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dialCtx, dialCancel := context.WithTimeout(ctx, timeout)
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defer dialCancel()
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dialer := net.Dialer{DualStack: true}
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edgeConn, err := dialer.DialContext(dialCtx, "tcp", edgeIP.String())
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if err != nil {
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return nil, dialError{cause: errors.Wrap(err, "DialContext error")}
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}
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tlsEdgeConn := tls.Client(edgeConn, em.tlsConfig)
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tlsEdgeConn.SetDeadline(time.Now().Add(timeout))
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if err = tlsEdgeConn.Handshake(); err != nil {
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return nil, dialError{cause: errors.Wrap(err, "Handshake with edge error")}
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}
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// clear the deadline on the conn; h2mux has its own timeouts
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tlsEdgeConn.SetDeadline(time.Time{})
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return tlsEdgeConn, nil
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}
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func (em *EdgeManager) noRetryMessage() string {
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messageTemplate := "cloudflared could not register an Argo Tunnel on your account. Please confirm the following before trying again:" +
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"1. You have Argo Smart Routing enabled in your account, See Enable Argo section of %s." +
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"2. Your credential at %s is still valid. See %s."
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return fmt.Sprintf(messageTemplate, quickStartLink, em.state.getConfigurable().UserCredentialPath, faqLink)
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}
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func (em *EdgeManager) shutdown() {
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em.state.shutdown()
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}
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type edgeManagerState struct {
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sync.RWMutex
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configurable *EdgeManagerConfigurable
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userCredential []byte
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conns map[uuid.UUID]*Connection
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}
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func newEdgeConnectionManagerState(configurable *EdgeManagerConfigurable, userCredential []byte) *edgeManagerState {
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return &edgeManagerState{
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configurable: configurable,
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userCredential: userCredential,
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conns: make(map[uuid.UUID]*Connection),
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}
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}
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func (ems *edgeManagerState) shouldCreateConnection(availableEdgeAddrs uint8) bool {
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ems.RLock()
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defer ems.RUnlock()
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expectedHAConns := ems.configurable.NumHAConnections
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if availableEdgeAddrs < expectedHAConns {
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expectedHAConns = availableEdgeAddrs
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}
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return uint8(len(ems.conns)) < expectedHAConns
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}
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func (ems *edgeManagerState) shouldReduceConnection() bool {
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ems.RLock()
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defer ems.RUnlock()
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return uint8(len(ems.conns)) > ems.configurable.NumHAConnections
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}
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func (ems *edgeManagerState) newConnection(conn *Connection) {
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ems.Lock()
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defer ems.Unlock()
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ems.conns[conn.id] = conn
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}
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func (ems *edgeManagerState) closeConnection(conn *Connection) {
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ems.Lock()
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defer ems.Unlock()
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delete(ems.conns, conn.id)
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}
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func (ems *edgeManagerState) getFirstConnection() *Connection {
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ems.RLock()
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defer ems.RUnlock()
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for _, conn := range ems.conns {
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return conn
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}
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return nil
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}
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func (ems *edgeManagerState) shutdown() {
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ems.Lock()
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defer ems.Unlock()
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for _, conn := range ems.conns {
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conn.Shutdown()
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}
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}
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func (ems *edgeManagerState) getConfigurable() *EdgeManagerConfigurable {
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ems.Lock()
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defer ems.Unlock()
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return ems.configurable
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}
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func (ems *edgeManagerState) updateConfigurable(newConfigurable *EdgeManagerConfigurable) {
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ems.Lock()
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defer ems.Unlock()
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ems.configurable = newConfigurable
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}
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func (ems *edgeManagerState) getUserCredential() []byte {
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ems.RLock()
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defer ems.RUnlock()
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return ems.userCredential
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}
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