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TUN-6007: Implement new edge discovery algorithm

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This commit is contained in:
Devin Carr
2022-05-20 14:51:36 -07:00
parent e3aad7799e
commit 4f468b8a5d
14 changed files with 1378 additions and 587 deletions
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124
supervisor/supervisor.go
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@@ -7,7 +7,6 @@ import (
"time"
"github.com/google/uuid"
"github.com/lucas-clemente/quic-go"
"github.com/rs/zerolog"
"github.com/cloudflare/cloudflared/connection"
@@ -42,6 +41,7 @@ type Supervisor struct {
config *TunnelConfig
orchestrator *orchestration.Orchestrator
edgeIPs *edgediscovery.Edge
edgeTunnelServer EdgeTunnelServer
tunnelErrors chan tunnelError
tunnelsConnecting map[int]chan struct{}
// nextConnectedIndex and nextConnectedSignal are used to wait for all
@@ -76,12 +76,34 @@ func NewSupervisor(config *TunnelConfig, orchestrator *orchestration.Orchestrato
if len(config.EdgeAddrs) > 0 {
edgeIPs, err = edgediscovery.StaticEdge(config.Log, config.EdgeAddrs)
} else {
edgeIPs, err = edgediscovery.ResolveEdge(config.Log, config.Region)
edgeIPs, err = edgediscovery.ResolveEdge(config.Log, config.Region, config.EdgeIPVersion)
}
if err != nil {
return nil, err
}
reconnectCredentialManager := newReconnectCredentialManager(connection.MetricsNamespace, connection.TunnelSubsystem, config.HAConnections)
log := NewConnAwareLogger(config.Log, config.Observer)
var edgeAddrHandler EdgeAddrHandler
if config.EdgeIPVersion == allregions.IPv6Only || config.EdgeIPVersion == allregions.Auto {
edgeAddrHandler = &IPAddrFallback{}
} else { // IPv4Only
edgeAddrHandler = &DefaultAddrFallback{}
}
edgeTunnelServer := EdgeTunnelServer{
config: config,
cloudflaredUUID: cloudflaredUUID,
orchestrator: orchestrator,
credentialManager: reconnectCredentialManager,
edgeAddrs: edgeIPs,
edgeAddrHandler: edgeAddrHandler,
reconnectCh: reconnectCh,
gracefulShutdownC: gracefulShutdownC,
connAwareLogger: log,
}
useReconnectToken := false
if config.ClassicTunnel != nil {
useReconnectToken = config.ClassicTunnel.UseReconnectToken
@@ -92,11 +114,12 @@ func NewSupervisor(config *TunnelConfig, orchestrator *orchestration.Orchestrato
config: config,
orchestrator: orchestrator,
edgeIPs: edgeIPs,
edgeTunnelServer: edgeTunnelServer,
tunnelErrors: make(chan tunnelError),
tunnelsConnecting: map[int]chan struct{}{},
log: NewConnAwareLogger(config.Log, config.Observer),
log: log,
logTransport: config.LogTransport,
reconnectCredentialManager: newReconnectCredentialManager(connection.MetricsNamespace, connection.TunnelSubsystem, config.HAConnections),
reconnectCredentialManager: reconnectCredentialManager,
useReconnectToken: useReconnectToken,
reconnectCh: reconnectCh,
gracefulShutdownC: gracefulShutdownC,
@@ -143,11 +166,18 @@ func (s *Supervisor) Run(
tunnelsActive--
}
return nil
// startTunnel returned with error
// startTunnel completed with a response
// (note that this may also be caused by context cancellation)
case tunnelError := <-s.tunnelErrors:
tunnelsActive--
if tunnelError.err != nil && !shuttingDown {
switch tunnelError.err.(type) {
case ReconnectSignal:
// For tunnels that closed with reconnect signal, we reconnect immediately
go s.startTunnel(ctx, tunnelError.index, s.newConnectedTunnelSignal(tunnelError.index))
tunnelsActive++
continue
}
s.log.ConnAwareLogger().Err(tunnelError.err).Int(connection.LogFieldConnIndex, tunnelError.index).Msg("Connection terminated")
tunnelsWaiting = append(tunnelsWaiting, tunnelError.index)
s.waitForNextTunnel(tunnelError.index)
@@ -155,10 +185,9 @@ func (s *Supervisor) Run(
if backoffTimer == nil {
backoffTimer = backoff.BackoffTimer()
}
// Previously we'd mark the edge address as bad here, but now we'll just silently use another.
} else if tunnelsActive == 0 {
// all connected tunnels exited gracefully, no more work to do
s.log.ConnAwareLogger().Msg("no more connections active and exiting")
// All connected tunnels exited gracefully, no more work to do
return nil
}
// Backoff was set and its timer expired
@@ -192,6 +221,8 @@ func (s *Supervisor) Run(
}
// Returns nil if initialization succeeded, else the initialization error.
// Attempts here will be made to connect one tunnel, if successful, it will
// connect the available tunnels up to config.HAConnections.
func (s *Supervisor) initialize(
ctx context.Context,
connectedSignal *signal.Signal,
@@ -203,6 +234,8 @@ func (s *Supervisor) initialize(
}
go s.startFirstTunnel(ctx, connectedSignal)
// Wait for response from first tunnel before proceeding to attempt other HA edge tunnels
select {
case <-ctx.Done():
<-s.tunnelErrors
@@ -213,6 +246,7 @@ func (s *Supervisor) initialize(
return errEarlyShutdown
case <-connectedSignal.Wait():
}
// At least one successful connection, so start the rest
for i := 1; i < s.config.HAConnections; i++ {
ch := signal.New(make(chan struct{}))
@@ -229,102 +263,42 @@ func (s *Supervisor) startFirstTunnel(
connectedSignal *signal.Signal,
) {
var (
addr *allregions.EdgeAddr
err error
err error
)
const firstConnIndex = 0
defer func() {
s.tunnelErrors <- tunnelError{index: firstConnIndex, err: err}
}()
addr, err = s.edgeIPs.GetAddr(firstConnIndex)
if err != nil {
return
}
err = s.edgeTunnelServer.Serve(ctx, firstConnIndex, connectedSignal)
err = ServeTunnelLoop(
ctx,
s.reconnectCredentialManager,
s.config,
s.orchestrator,
addr,
s.log,
firstConnIndex,
connectedSignal,
s.cloudflaredUUID,
s.reconnectCh,
s.gracefulShutdownC,
)
// If the first tunnel disconnects, keep restarting it.
edgeErrors := 0
for s.unusedIPs() {
if ctx.Err() != nil {
return
}
switch err.(type) {
case nil:
return
// try the next address if it was a quic.IdleTimeoutError, dialError(network problem) or
// dupConnRegisterTunnelError
case *quic.IdleTimeoutError, edgediscovery.DialError, connection.DupConnRegisterTunnelError:
edgeErrors++
default:
if err == nil {
return
}
if edgeErrors >= 2 {
addr, err = s.edgeIPs.GetDifferentAddr(firstConnIndex)
if err != nil {
return
}
}
err = ServeTunnelLoop(
ctx,
s.reconnectCredentialManager,
s.config,
s.orchestrator,
addr,
s.log,
firstConnIndex,
connectedSignal,
s.cloudflaredUUID,
s.reconnectCh,
s.gracefulShutdownC,
)
err = s.edgeTunnelServer.Serve(ctx, firstConnIndex, connectedSignal)
}
}
// startTunnel starts a new tunnel connection. The resulting error will be sent on
// s.tunnelErrors.
// s.tunnelError as this is expected to run in a goroutine.
func (s *Supervisor) startTunnel(
ctx context.Context,
index int,
connectedSignal *signal.Signal,
) {
var (
addr *allregions.EdgeAddr
err error
err error
)
defer func() {
s.tunnelErrors <- tunnelError{index: index, err: err}
}()
addr, err = s.edgeIPs.GetDifferentAddr(index)
if err != nil {
return
}
err = ServeTunnelLoop(
ctx,
s.reconnectCredentialManager,
s.config,
s.orchestrator,
addr,
s.log,
uint8(index),
connectedSignal,
s.cloudflaredUUID,
s.reconnectCh,
s.gracefulShutdownC,
)
err = s.edgeTunnelServer.Serve(ctx, uint8(index), connectedSignal)
}
func (s *Supervisor) newConnectedTunnelSignal(index int) *signal.Signal {