cloudflared-mirror/origin/tunnel.go

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package origin
import (
"bufio"
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
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"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"github.com/cloudflare/cloudflared/buffer"
"github.com/cloudflare/cloudflared/cmd/cloudflared/buildinfo"
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"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/h2mux"
"github.com/cloudflare/cloudflared/signal"
"github.com/cloudflare/cloudflared/streamhandler"
"github.com/cloudflare/cloudflared/tunnelrpc"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
"github.com/cloudflare/cloudflared/validation"
"github.com/cloudflare/cloudflared/websocket"
)
const (
dialTimeout = 15 * time.Second
openStreamTimeout = 30 * time.Second
muxerTimeout = 5 * time.Second
lbProbeUserAgentPrefix = "Mozilla/5.0 (compatible; Cloudflare-Traffic-Manager/1.0; +https://www.cloudflare.com/traffic-manager/;"
TagHeaderNamePrefix = "Cf-Warp-Tag-"
DuplicateConnectionError = "EDUPCONN"
)
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type registerRPCName string
const (
register registerRPCName = "register"
reconnect registerRPCName = "reconnect"
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unknown registerRPCName = "unknown"
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)
type TunnelConfig struct {
BuildInfo *buildinfo.BuildInfo
ClientID string
ClientTlsConfig *tls.Config
CloseConnOnce *sync.Once // Used to close connectedSignal no more than once
CompressionQuality uint64
EdgeAddrs []string
GracePeriod time.Duration
HAConnections int
HTTPTransport http.RoundTripper
HeartbeatInterval time.Duration
Hostname string
HTTPHostHeader string
IncidentLookup IncidentLookup
IsAutoupdated bool
IsFreeTunnel bool
LBPool string
Logger *log.Logger
MaxHeartbeats uint64
Metrics *TunnelMetrics
MetricsUpdateFreq time.Duration
NoChunkedEncoding bool
OriginCert []byte
ReportedVersion string
Retries uint
RunFromTerminal bool
Tags []tunnelpogs.Tag
TlsConfig *tls.Config
TransportLogger *log.Logger
UseDeclarativeTunnel bool
WSGI bool
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// OriginUrl may not be used if a user specifies a unix socket.
OriginUrl string
// feature-flag to use new edge reconnect tokens
UseReconnectToken bool
}
// ReconnectTunnelCredentialManager is invoked by functions in this file to
// get/set parameters for ReconnectTunnel RPC calls.
type ReconnectTunnelCredentialManager interface {
ReconnectToken() ([]byte, error)
EventDigest() ([]byte, error)
SetEventDigest(eventDigest []byte)
}
type dupConnRegisterTunnelError struct{}
func (e dupConnRegisterTunnelError) Error() string {
return "already connected to this server"
}
type muxerShutdownError struct{}
func (e muxerShutdownError) Error() string {
return "muxer shutdown"
}
// RegisterTunnel error from server
type serverRegisterTunnelError struct {
cause error
permanent bool
}
func (e serverRegisterTunnelError) Error() string {
return e.cause.Error()
}
// RegisterTunnel error from client
type clientRegisterTunnelError struct {
cause error
}
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func newClientRegisterTunnelError(cause error, counter *prometheus.CounterVec, name registerRPCName) clientRegisterTunnelError {
counter.WithLabelValues(cause.Error(), string(name)).Inc()
return clientRegisterTunnelError{cause: cause}
}
func (e clientRegisterTunnelError) Error() string {
return e.cause.Error()
}
func (c *TunnelConfig) muxerConfig(handler h2mux.MuxedStreamHandler) h2mux.MuxerConfig {
return h2mux.MuxerConfig{
Timeout: muxerTimeout,
Handler: handler,
IsClient: true,
HeartbeatInterval: c.HeartbeatInterval,
MaxHeartbeats: c.MaxHeartbeats,
Logger: c.TransportLogger.WithFields(log.Fields{}),
CompressionQuality: h2mux.CompressionSetting(c.CompressionQuality),
}
}
func (c *TunnelConfig) RegistrationOptions(connectionID uint8, OriginLocalIP string, uuid uuid.UUID) *tunnelpogs.RegistrationOptions {
policy := tunnelrpc.ExistingTunnelPolicy_balance
if c.HAConnections <= 1 && c.LBPool == "" {
policy = tunnelrpc.ExistingTunnelPolicy_disconnect
}
return &tunnelpogs.RegistrationOptions{
ClientID: c.ClientID,
Version: c.ReportedVersion,
OS: fmt.Sprintf("%s_%s", c.BuildInfo.GoOS, c.BuildInfo.GoArch),
ExistingTunnelPolicy: policy,
PoolName: c.LBPool,
Tags: c.Tags,
ConnectionID: connectionID,
OriginLocalIP: OriginLocalIP,
IsAutoupdated: c.IsAutoupdated,
RunFromTerminal: c.RunFromTerminal,
CompressionQuality: c.CompressionQuality,
UUID: uuid.String(),
Features: connection.SUPPORTED_FEATURES,
}
}
func StartTunnelDaemon(ctx context.Context, config *TunnelConfig, connectedSignal *signal.Signal, cloudflaredID uuid.UUID) error {
s, err := NewSupervisor(config, cloudflaredID)
if err != nil {
return err
}
return s.Run(ctx, connectedSignal)
}
func ServeTunnelLoop(ctx context.Context,
credentialManager ReconnectTunnelCredentialManager,
config *TunnelConfig,
addr *net.TCPAddr,
connectionID uint8,
connectedSignal *signal.Signal,
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u uuid.UUID,
bufferPool *buffer.Pool,
) error {
connectionLogger := config.Logger.WithField("connectionID", connectionID)
config.Metrics.incrementHaConnections()
defer config.Metrics.decrementHaConnections()
backoff := BackoffHandler{MaxRetries: config.Retries}
connectedFuse := h2mux.NewBooleanFuse()
go func() {
if connectedFuse.Await() {
connectedSignal.Notify()
}
}()
// Ensure the above goroutine will terminate if we return without connecting
defer connectedFuse.Fuse(false)
for {
err, recoverable := ServeTunnel(
ctx,
credentialManager,
config,
connectionLogger,
addr, connectionID,
connectedFuse,
&backoff,
u,
bufferPool,
)
if recoverable {
if duration, ok := backoff.GetBackoffDuration(ctx); ok {
connectionLogger.Infof("Retrying in %s seconds", duration)
backoff.Backoff(ctx)
continue
}
}
return err
}
}
func ServeTunnel(
ctx context.Context,
credentialManager ReconnectTunnelCredentialManager,
config *TunnelConfig,
logger *log.Entry,
addr *net.TCPAddr,
connectionID uint8,
connectedFuse *h2mux.BooleanFuse,
backoff *BackoffHandler,
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u uuid.UUID,
bufferPool *buffer.Pool,
) (err error, recoverable bool) {
// Treat panics as recoverable errors
defer func() {
if r := recover(); r != nil {
var ok bool
err, ok = r.(error)
if !ok {
err = fmt.Errorf("ServeTunnel: %v", r)
}
recoverable = true
}
}()
connectionTag := uint8ToString(connectionID)
// additional tags to send other than hostname which is set in cloudflared main package
tags := make(map[string]string)
tags["ha"] = connectionTag
// Returns error from parsing the origin URL or handshake errors
handler, originLocalIP, err := NewTunnelHandler(ctx, config, addr, connectionID, bufferPool)
if err != nil {
errLog := logger.WithError(err)
switch err.(type) {
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case connection.DialError:
errLog.Error("Unable to dial edge")
case h2mux.MuxerHandshakeError:
errLog.Error("Handshake failed with edge server")
default:
errLog.Error("Tunnel creation failure")
return err, false
}
return err, true
}
errGroup, serveCtx := errgroup.WithContext(ctx)
errGroup.Go(func() (err error) {
defer func() {
if err == nil {
connectedFuse.Fuse(true)
backoff.SetGracePeriod()
}
}()
if config.UseReconnectToken && connectedFuse.Value() {
token, tokenErr := credentialManager.ReconnectToken()
eventDigest, eventDigestErr := credentialManager.EventDigest()
// if we have both credentials, we can reconnect
if tokenErr == nil && eventDigestErr == nil {
return ReconnectTunnel(serveCtx, token, eventDigest, handler.muxer, config, logger, connectionID, originLocalIP, u)
}
// log errors and proceed to RegisterTunnel
if tokenErr != nil {
logger.WithError(tokenErr).Error("Couldn't get reconnect token")
}
if eventDigestErr != nil {
logger.WithError(eventDigestErr).Error("Couldn't get event digest")
}
}
return RegisterTunnel(serveCtx, credentialManager, handler.muxer, config, logger, connectionID, originLocalIP, u)
})
errGroup.Go(func() error {
updateMetricsTickC := time.Tick(config.MetricsUpdateFreq)
for {
select {
case <-serveCtx.Done():
// UnregisterTunnel blocks until the RPC call returns
err := UnregisterTunnel(handler.muxer, config.GracePeriod, config.TransportLogger)
handler.muxer.Shutdown()
return err
case <-updateMetricsTickC:
handler.UpdateMetrics(connectionTag)
}
}
})
errGroup.Go(func() error {
// All routines should stop when muxer finish serving. When muxer is shutdown
// gracefully, it doesn't return an error, so we need to return errMuxerShutdown
// here to notify other routines to stop
err := handler.muxer.Serve(serveCtx)
if err == nil {
return muxerShutdownError{}
}
return err
})
err = errGroup.Wait()
if err != nil {
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_ = newClientRegisterTunnelError(err, config.Metrics.regFail, unknown)
switch castedErr := err.(type) {
case dupConnRegisterTunnelError:
logger.Info("Already connected to this server, selecting a different one")
return err, true
case serverRegisterTunnelError:
logger.WithError(castedErr.cause).Error("Register tunnel error from server side")
// Don't send registration error return from server to Sentry. They are
// logged on server side
if incidents := config.IncidentLookup.ActiveIncidents(); len(incidents) > 0 {
logger.Error(activeIncidentsMsg(incidents))
}
return castedErr.cause, !castedErr.permanent
case clientRegisterTunnelError:
logger.WithError(castedErr.cause).Error("Register tunnel error on client side")
return err, true
case muxerShutdownError:
logger.Infof("Muxer shutdown")
return err, true
default:
logger.WithError(err).Error("Serve tunnel error")
return err, true
}
}
return nil, true
}
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func RegisterTunnel(
ctx context.Context,
credentialManager ReconnectTunnelCredentialManager,
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muxer *h2mux.Muxer,
config *TunnelConfig,
logger *log.Entry,
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connectionID uint8,
originLocalIP string,
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uuid uuid.UUID,
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) error {
config.TransportLogger.Debug("initiating RPC stream to register")
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tunnelServer, err := connection.NewRPCClient(ctx, muxer, config.TransportLogger.WithField("subsystem", "rpc-register"), openStreamTimeout)
if err != nil {
// RPC stream open error
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return newClientRegisterTunnelError(err, config.Metrics.rpcFail, register)
}
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defer tunnelServer.Close()
// Request server info without blocking tunnel registration; must use capnp library directly.
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serverInfoPromise := tunnelrpc.TunnelServer{Client: tunnelServer.Client}.GetServerInfo(ctx, func(tunnelrpc.TunnelServer_getServerInfo_Params) error {
return nil
})
LogServerInfo(serverInfoPromise.Result(), connectionID, config.Metrics, logger)
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registration := tunnelServer.RegisterTunnel(
ctx,
config.OriginCert,
config.Hostname,
config.RegistrationOptions(connectionID, originLocalIP, uuid),
)
if registrationErr := registration.DeserializeError(); registrationErr != nil {
// RegisterTunnel RPC failure
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return processRegisterTunnelError(registrationErr, config.Metrics, register)
}
credentialManager.SetEventDigest(registration.EventDigest)
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return processRegistrationSuccess(config, logger, connectionID, registration, register)
}
func ReconnectTunnel(
ctx context.Context,
token []byte,
eventDigest []byte,
muxer *h2mux.Muxer,
config *TunnelConfig,
logger *log.Entry,
connectionID uint8,
originLocalIP string,
uuid uuid.UUID,
) error {
config.TransportLogger.Debug("initiating RPC stream to reconnect")
tunnelServer, err := connection.NewRPCClient(ctx, muxer, config.TransportLogger.WithField("subsystem", "rpc-reconnect"), openStreamTimeout)
if err != nil {
// RPC stream open error
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return newClientRegisterTunnelError(err, config.Metrics.rpcFail, reconnect)
}
defer tunnelServer.Close()
// Request server info without blocking tunnel registration; must use capnp library directly.
serverInfoPromise := tunnelrpc.TunnelServer{Client: tunnelServer.Client}.GetServerInfo(ctx, func(tunnelrpc.TunnelServer_getServerInfo_Params) error {
return nil
})
LogServerInfo(serverInfoPromise.Result(), connectionID, config.Metrics, logger)
registration := tunnelServer.ReconnectTunnel(
ctx,
token,
eventDigest,
config.Hostname,
config.RegistrationOptions(connectionID, originLocalIP, uuid),
)
if registrationErr := registration.DeserializeError(); registrationErr != nil {
// ReconnectTunnel RPC failure
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return processRegisterTunnelError(registrationErr, config.Metrics, reconnect)
}
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return processRegistrationSuccess(config, logger, connectionID, registration, reconnect)
}
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func processRegistrationSuccess(config *TunnelConfig, logger *log.Entry, connectionID uint8, registration *tunnelpogs.TunnelRegistration, name registerRPCName) error {
for _, logLine := range registration.LogLines {
logger.Info(logLine)
}
if registration.TunnelID != "" {
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config.Metrics.tunnelsHA.AddTunnelID(connectionID, registration.TunnelID)
logger.Infof("Each HA connection's tunnel IDs: %v", config.Metrics.tunnelsHA.String())
}
// Print out the user's trial zone URL in a nice box (if they requested and got one)
if isTrialTunnel := config.Hostname == ""; isTrialTunnel {
if url, err := url.Parse(registration.Url); err == nil {
for _, line := range asciiBox(trialZoneMsg(url.String()), 2) {
logger.Infoln(line)
}
} else {
logger.Errorln("Failed to connect tunnel, please try again.")
return fmt.Errorf("empty URL in response from Cloudflare edge")
}
}
config.Metrics.userHostnamesCounts.WithLabelValues(registration.Url).Inc()
logger.Infof("Route propagating, it may take up to 1 minute for your new route to become functional")
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config.Metrics.regSuccess.WithLabelValues(string(name)).Inc()
return nil
}
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func processRegisterTunnelError(err tunnelpogs.TunnelRegistrationError, metrics *TunnelMetrics, name registerRPCName) error {
if err.Error() == DuplicateConnectionError {
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metrics.regFail.WithLabelValues("dup_edge_conn", string(name)).Inc()
return dupConnRegisterTunnelError{}
}
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metrics.regFail.WithLabelValues("server_error", string(name)).Inc()
return serverRegisterTunnelError{
cause: fmt.Errorf("Server error: %s", err.Error()),
permanent: err.IsPermanent(),
}
}
func UnregisterTunnel(muxer *h2mux.Muxer, gracePeriod time.Duration, logger *log.Logger) error {
logger.Debug("initiating RPC stream to unregister")
ctx := context.Background()
tunnelServer, err := connection.NewRPCClient(ctx, muxer, logger.WithField("subsystem", "rpc-unregister"), openStreamTimeout)
if err != nil {
// RPC stream open error
return err
}
// gracePeriod is encoded in int64 using capnproto
return tunnelServer.UnregisterTunnel(ctx, gracePeriod.Nanoseconds())
}
func LogServerInfo(
promise tunnelrpc.ServerInfo_Promise,
connectionID uint8,
metrics *TunnelMetrics,
logger *log.Entry,
) {
serverInfoMessage, err := promise.Struct()
if err != nil {
logger.WithError(err).Warn("Failed to retrieve server information")
return
}
serverInfo, err := tunnelpogs.UnmarshalServerInfo(serverInfoMessage)
if err != nil {
logger.WithError(err).Warn("Failed to retrieve server information")
return
}
logger.Infof("Connected to %s", serverInfo.LocationName)
metrics.registerServerLocation(uint8ToString(connectionID), serverInfo.LocationName)
}
type TunnelHandler struct {
originUrl string
httpHostHeader string
muxer *h2mux.Muxer
httpClient http.RoundTripper
tlsConfig *tls.Config
tags []tunnelpogs.Tag
metrics *TunnelMetrics
// connectionID is only used by metrics, and prometheus requires labels to be string
connectionID string
logger *log.Logger
noChunkedEncoding bool
bufferPool *buffer.Pool
}
// NewTunnelHandler returns a TunnelHandler, origin LAN IP and error
func NewTunnelHandler(ctx context.Context,
config *TunnelConfig,
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addr *net.TCPAddr,
connectionID uint8,
bufferPool *buffer.Pool,
) (*TunnelHandler, string, error) {
originURL, err := validation.ValidateUrl(config.OriginUrl)
if err != nil {
return nil, "", fmt.Errorf("unable to parse origin URL %#v", originURL)
}
h := &TunnelHandler{
originUrl: originURL,
httpHostHeader: config.HTTPHostHeader,
httpClient: config.HTTPTransport,
tlsConfig: config.ClientTlsConfig,
tags: config.Tags,
metrics: config.Metrics,
connectionID: uint8ToString(connectionID),
logger: config.Logger,
noChunkedEncoding: config.NoChunkedEncoding,
bufferPool: bufferPool,
}
if h.httpClient == nil {
h.httpClient = http.DefaultTransport
}
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edgeConn, err := connection.DialEdge(ctx, dialTimeout, config.TlsConfig, addr)
if err != nil {
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return nil, "", err
}
// Establish a muxed connection with the edge
// Client mux handshake with agent server
h.muxer, err = h2mux.Handshake(edgeConn, edgeConn, config.muxerConfig(h), h.metrics.activeStreams)
if err != nil {
return nil, "", errors.Wrap(err, "h2mux handshake with edge error")
}
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return h, edgeConn.LocalAddr().String(), nil
}
func (h *TunnelHandler) AppendTagHeaders(r *http.Request) {
for _, tag := range h.tags {
r.Header.Add(TagHeaderNamePrefix+tag.Name, tag.Value)
}
}
func (h *TunnelHandler) ServeStream(stream *h2mux.MuxedStream) error {
h.metrics.incrementRequests(h.connectionID)
defer h.metrics.decrementConcurrentRequests(h.connectionID)
req, reqErr := h.createRequest(stream)
if reqErr != nil {
h.logError(stream, reqErr)
return reqErr
}
cfRay := streamhandler.FindCfRayHeader(req)
lbProbe := streamhandler.IsLBProbeRequest(req)
h.logRequest(req, cfRay, lbProbe)
var resp *http.Response
var respErr error
if websocket.IsWebSocketUpgrade(req) {
resp, respErr = h.serveWebsocket(stream, req)
} else {
resp, respErr = h.serveHTTP(stream, req)
}
if respErr != nil {
h.logError(stream, respErr)
return respErr
}
h.logResponseOk(resp, cfRay, lbProbe)
return nil
}
func (h *TunnelHandler) createRequest(stream *h2mux.MuxedStream) (*http.Request, error) {
req, err := http.NewRequest("GET", h.originUrl, h2mux.MuxedStreamReader{MuxedStream: stream})
if err != nil {
return nil, errors.Wrap(err, "Unexpected error from http.NewRequest")
}
err = h2mux.OldH2RequestHeadersToH1Request(stream.Headers, req)
if err != nil {
return nil, errors.Wrap(err, "invalid request received")
}
h.AppendTagHeaders(req)
return req, nil
}
func (h *TunnelHandler) serveWebsocket(stream *h2mux.MuxedStream, req *http.Request) (*http.Response, error) {
if h.httpHostHeader != "" {
req.Header.Set("Host", h.httpHostHeader)
req.Host = h.httpHostHeader
}
conn, response, err := websocket.ClientConnect(req, h.tlsConfig)
if err != nil {
return nil, err
}
defer conn.Close()
err = stream.WriteHeaders(h2mux.OldH1ResponseToH2ResponseHeaders(response))
if err != nil {
return nil, errors.Wrap(err, "Error writing response header")
}
// Copy to/from stream to the undelying connection. Use the underlying
// connection because cloudflared doesn't operate on the message themselves
websocket.Stream(conn.UnderlyingConn(), stream)
return response, nil
}
func (h *TunnelHandler) serveHTTP(stream *h2mux.MuxedStream, req *http.Request) (*http.Response, error) {
// Support for WSGI Servers by switching transfer encoding from chunked to gzip/deflate
if h.noChunkedEncoding {
req.TransferEncoding = []string{"gzip", "deflate"}
cLength, err := strconv.Atoi(req.Header.Get("Content-Length"))
if err == nil {
req.ContentLength = int64(cLength)
}
}
// Request origin to keep connection alive to improve performance
req.Header.Set("Connection", "keep-alive")
if h.httpHostHeader != "" {
req.Header.Set("Host", h.httpHostHeader)
req.Host = h.httpHostHeader
}
response, err := h.httpClient.RoundTrip(req)
if err != nil {
return nil, errors.Wrap(err, "Error proxying request to origin")
}
defer response.Body.Close()
err = stream.WriteHeaders(h2mux.OldH1ResponseToH2ResponseHeaders(response))
if err != nil {
return nil, errors.Wrap(err, "Error writing response header")
}
if h.isEventStream(response) {
h.writeEventStream(stream, response.Body)
} else {
// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
// compression generates dictionary on first write
buf := h.bufferPool.Get()
defer h.bufferPool.Put(buf)
io.CopyBuffer(stream, response.Body, buf)
}
return response, nil
}
func (h *TunnelHandler) writeEventStream(stream *h2mux.MuxedStream, responseBody io.ReadCloser) {
reader := bufio.NewReader(responseBody)
for {
line, err := reader.ReadBytes('\n')
if err != nil {
break
}
stream.Write(line)
}
}
func (h *TunnelHandler) isEventStream(response *http.Response) bool {
if response.Header.Get("content-type") == "text/event-stream" {
h.logger.Debug("Detected Server-Side Events from Origin")
return true
}
return false
}
func (h *TunnelHandler) logError(stream *h2mux.MuxedStream, err error) {
h.logger.WithError(err).Error("HTTP request error")
stream.WriteHeaders([]h2mux.Header{{Name: ":status", Value: "502"}})
stream.Write([]byte("502 Bad Gateway"))
h.metrics.incrementResponses(h.connectionID, "502")
}
func (h *TunnelHandler) logRequest(req *http.Request, cfRay string, lbProbe bool) {
logger := log.NewEntry(h.logger)
if cfRay != "" {
logger = logger.WithField("CF-RAY", cfRay)
logger.Debugf("%s %s %s", req.Method, req.URL, req.Proto)
} else if lbProbe {
logger.Debugf("Load Balancer health check %s %s %s", req.Method, req.URL, req.Proto)
} else {
logger.Warnf("All requests should have a CF-RAY header. Please open a support ticket with Cloudflare. %s %s %s ", req.Method, req.URL, req.Proto)
}
logger.Debugf("Request Headers %+v", req.Header)
if contentLen := req.ContentLength; contentLen == -1 {
logger.Debugf("Request Content length unknown")
} else {
logger.Debugf("Request content length %d", contentLen)
}
}
func (h *TunnelHandler) logResponseOk(r *http.Response, cfRay string, lbProbe bool) {
h.metrics.incrementResponses(h.connectionID, "200")
logger := log.NewEntry(h.logger)
if cfRay != "" {
logger = logger.WithField("CF-RAY", cfRay)
logger.Debugf("%s", r.Status)
} else if lbProbe {
logger.Debugf("Response to Load Balancer health check %s", r.Status)
} else {
logger.Infof("%s", r.Status)
}
logger.Debugf("Response Headers %+v", r.Header)
if contentLen := r.ContentLength; contentLen == -1 {
logger.Debugf("Response content length unknown")
} else {
logger.Debugf("Response content length %d", contentLen)
}
}
func (h *TunnelHandler) UpdateMetrics(connectionID string) {
h.metrics.updateMuxerMetrics(connectionID, h.muxer.Metrics())
}
func uint8ToString(input uint8) string {
return strconv.FormatUint(uint64(input), 10)
}
// Print out the given lines in a nice ASCII box.
func asciiBox(lines []string, padding int) (box []string) {
maxLen := maxLen(lines)
spacer := strings.Repeat(" ", padding)
border := "+" + strings.Repeat("-", maxLen+(padding*2)) + "+"
box = append(box, border)
for _, line := range lines {
box = append(box, "|"+spacer+line+strings.Repeat(" ", maxLen-len(line))+spacer+"|")
}
box = append(box, border)
return
}
func maxLen(lines []string) int {
max := 0
for _, line := range lines {
if len(line) > max {
max = len(line)
}
}
return max
}
func trialZoneMsg(url string) []string {
return []string{
"Your free tunnel has started! Visit it:",
" " + url,
}
}
func activeIncidentsMsg(incidents []Incident) string {
preamble := "There is an active Cloudflare incident that may be related:"
if len(incidents) > 1 {
preamble = "There are active Cloudflare incidents that may be related:"
}
incidentStrings := []string{}
for _, incident := range incidents {
incidentString := fmt.Sprintf("%s (%s)", incident.Name, incident.URL())
incidentStrings = append(incidentStrings, incidentString)
}
return preamble + " " + strings.Join(incidentStrings, "; ")
}