mirror of https://github.com/status-im/consul.git
Fix xDS deadlock due to syncLoop termination. (#20867)
* Fix xDS deadlock due to syncLoop termination. This fixes an issue where agentless xDS streams can deadlock permanently until a server is restarted. When this issue occurs, no new proxies are able to successfully connect to the server. Effectively, the trigger for this deadlock stems from the following return statement: https://github.com/hashicorp/consul/blob/v1.18.0/agent/proxycfg-sources/catalog/config_source.go#L199-L202 When this happens, the entire `syncLoop()` terminates and stops consuming from the following channel: https://github.com/hashicorp/consul/blob/v1.18.0/agent/proxycfg-sources/catalog/config_source.go#L182-L192 Which results in the `ConfigSource.cleanup()` function never receiving a response and holding a mutex indefinitely: https://github.com/hashicorp/consul/blob/v1.18.0/agent/proxycfg-sources/catalog/config_source.go#L241-L247 Because this mutex is shared, it effectively deadlocks the server's ability to process new xDS streams. ---- The fix to this issue involves removing the `chan chan struct{}` used like an RPC-over-channels pattern and replacing it with two distinct channels: + `stopSyncLoopCh` - indicates that the `syncLoop()` should terminate soon. + `syncLoopDoneCh` - indicates that the `syncLoop()` has terminated. Splitting these two concepts out and deferring a `close(syncLoopDoneCh)` in the `syncLoop()` function ensures that the deadlock above should no longer occur. We also now evict xDS connections of all proxies for the corresponding `syncLoop()` whenever it encounters an irrecoverable error. This is done by hoisting the new `syncLoopDoneCh` upwards so that it's visible to the xDS delta processing. Prior to this fix, the behavior was to simply orphan them so they would never receive catalog-registration or service-defaults updates. * Add changelog.
This commit is contained in:
Derek Menteer
GitHub
parent
eabff257d7
commit
0ac8ae6c3b
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@ -0,0 +1,3 @@
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```release-note:bug
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connect: Fix xDS deadlock that could result in proxies being unable to start.
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```
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@ -34,9 +34,12 @@ type ConfigSource struct {
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shutdownCh chan struct{}
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}
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var _ Watcher = (*ConfigSource)(nil)
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type watch struct {
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numWatchers int // guarded by ConfigSource.mu.
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closeCh chan chan struct{}
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numWatchers int // guarded by ConfigSource.mu.
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stopSyncLoopCh chan struct{}
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syncLoopDoneCh chan struct{}
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}
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// NewConfigSource creates a ConfigSource with the given configuration.
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@ -50,7 +53,7 @@ func NewConfigSource(cfg Config) *ConfigSource {
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// Watch wraps the underlying proxycfg.Manager and dynamically registers
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// services from the catalog with it when requested by the xDS server.
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func (m *ConfigSource) Watch(id *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error) {
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func (m *ConfigSource) Watch(id *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error) {
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// Create service ID
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serviceID := structs.NewServiceID(id.Name, GetEnterpriseMetaFromResourceID(id))
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// If the service is registered to the local agent, use the LocalConfigSource
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@ -67,7 +70,7 @@ func (m *ConfigSource) Watch(id *pbresource.ID, nodeName string, token string) (
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// See: https://github.com/hashicorp/consul/issues/15753
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session, err := m.SessionLimiter.BeginSession()
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if err != nil {
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return nil, nil, nil, err
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return nil, nil, nil, nil, err
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}
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proxyID := proxycfg.ProxyID{
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@ -79,6 +82,28 @@ func (m *ConfigSource) Watch(id *pbresource.ID, nodeName string, token string) (
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// Start the watch on the real proxycfg Manager.
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snapCh, cancelWatch := m.Manager.Watch(proxyID)
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m.mu.Lock()
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defer m.mu.Unlock()
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w, ok := m.watches[proxyID]
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if ok {
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w.numWatchers++
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} else {
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w = &watch{
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numWatchers: 1,
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stopSyncLoopCh: make(chan struct{}),
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syncLoopDoneCh: make(chan struct{}),
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}
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m.watches[proxyID] = w
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if err := m.startSync(w.stopSyncLoopCh, w.syncLoopDoneCh, proxyID); err != nil {
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delete(m.watches, proxyID)
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cancelWatch()
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session.End()
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return nil, nil, nil, nil, err
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}
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}
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// Wrap the cancelWatch function with our bookkeeping. m.mu must be held when calling.
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var cancelOnce sync.Once
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cancel := func() {
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@ -88,26 +113,7 @@ func (m *ConfigSource) Watch(id *pbresource.ID, nodeName string, token string) (
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session.End()
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})
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}
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m.mu.Lock()
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defer m.mu.Unlock()
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w, ok := m.watches[proxyID]
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if ok {
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w.numWatchers++
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} else {
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w = &watch{closeCh: make(chan chan struct{}), numWatchers: 1}
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m.watches[proxyID] = w
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if err := m.startSync(w.closeCh, proxyID); err != nil {
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delete(m.watches, proxyID)
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cancelWatch()
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session.End()
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return nil, nil, nil, err
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}
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}
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return snapCh, session.Terminated(), cancel, nil
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return snapCh, session.Terminated(), w.syncLoopDoneCh, cancel, nil
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}
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func (m *ConfigSource) Shutdown() {
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@ -122,7 +128,11 @@ func (m *ConfigSource) Shutdown() {
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//
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// If the first attempt to fetch and register the service fails, startSync
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// will return an error (and no goroutine will be started).
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func (m *ConfigSource) startSync(closeCh <-chan chan struct{}, proxyID proxycfg.ProxyID) error {
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func (m *ConfigSource) startSync(
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stopSyncLoopCh <-chan struct{},
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syncLoopDoneCh chan<- struct{},
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proxyID proxycfg.ProxyID,
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) error {
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logger := m.Logger.With(
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"proxy_service_id", proxyID.ServiceID.String(),
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"node", proxyID.NodeName,
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@ -170,7 +180,13 @@ func (m *ConfigSource) startSync(closeCh <-chan chan struct{}, proxyID proxycfg.
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syncLoop := func(ws memdb.WatchSet) {
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// Cancel the context on return to clean up the goroutine started by WatchCh.
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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defer func() {
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cancel()
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logger.Debug("de-registering service with proxycfg manager because all watchers have gone away")
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m.Manager.Deregister(proxyID, source)
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close(syncLoopDoneCh)
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logger.Debug("sync-loop terminated")
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}()
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for {
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select {
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@ -179,16 +195,13 @@ func (m *ConfigSource) startSync(closeCh <-chan chan struct{}, proxyID proxycfg.
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//
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// It is expected that all other branches of this select will return and
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// cancel the context given to WatchCh (to clean up its goroutine).
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case doneCh := <-closeCh:
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case <-stopSyncLoopCh:
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// All watchers of this service (xDS streams) have gone away, so it's time
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// to free its resources.
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//
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// TODO(agentless): we should probably wait for a short grace period before
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// de-registering the service to allow clients to reconnect after a network
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// blip.
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logger.Trace("de-registering service with proxycfg manager because all watchers have gone away")
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m.Manager.Deregister(proxyID, source)
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close(doneCh)
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return
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case <-m.shutdownCh:
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// Manager is shutting down, stop the goroutine.
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@ -198,6 +211,7 @@ func (m *ConfigSource) startSync(closeCh <-chan chan struct{}, proxyID proxycfg.
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var err error
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ws, err = fetchAndRegister()
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if err != nil {
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logger.Debug("error in syncLoop.fetchAndRegister", "err", err)
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return
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}
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}
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@ -233,18 +247,14 @@ func (m *ConfigSource) cleanup(id proxycfg.ProxyID) {
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h.numWatchers--
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if h.numWatchers == 0 {
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// We wait for doneCh to be closed by the sync goroutine, so that the lock is
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// Notify the sync loop that it should terminate.
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close(h.stopSyncLoopCh)
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// We wait for sync loop to be closed, so that the lock is
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// held until after the service is de-registered - this prevents a potential
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// race where another sync goroutine is started for the service and we undo
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// its call to register the service.
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//
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// This cannot deadlock because closeCh is unbuffered. Sending will only
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// succeed if the sync goroutine is ready to receive (which always closes
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// doneCh).
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doneCh := make(chan struct{})
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select {
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case h.closeCh <- doneCh:
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<-doneCh
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case <-h.syncLoopDoneCh:
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case <-m.shutdownCh:
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// ConfigSource is shutting down, so the goroutine will be stopped anyway.
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}
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@ -293,7 +303,7 @@ type Store interface {
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//go:generate mockery --name Watcher --inpackage
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type Watcher interface {
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Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error)
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Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error)
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}
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//go:generate mockery --name SessionLimiter --inpackage
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@ -6,6 +6,7 @@ package catalog
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import (
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"context"
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"errors"
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"fmt"
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"testing"
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"time"
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@ -79,7 +80,7 @@ func TestConfigSource_Success(t *testing.T) {
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})
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t.Cleanup(mgr.Shutdown)
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snapCh, termCh, cancelWatch1, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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snapCh, termCh, _, cancelWatch1, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.NoError(t, err)
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require.Equal(t, session1TermCh, termCh)
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@ -136,7 +137,7 @@ func TestConfigSource_Success(t *testing.T) {
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}
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// Start another watch.
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_, termCh2, cancelWatch2, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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_, termCh2, _, cancelWatch2, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.NoError(t, err)
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require.Equal(t, session2TermCh, termCh2)
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@ -179,7 +180,7 @@ func TestConfigSource_LocallyManagedService(t *testing.T) {
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localWatcher := NewMockWatcher(t)
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localWatcher.On("Watch", proxyID, nodeName, token).
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Return(make(<-chan proxysnapshot.ProxySnapshot), nil, proxysnapshot.CancelFunc(func() {}), nil)
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Return(make(<-chan proxysnapshot.ProxySnapshot), nil, nil, proxysnapshot.CancelFunc(func() {}), nil)
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mgr := NewConfigSource(Config{
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NodeName: nodeName,
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@ -191,7 +192,7 @@ func TestConfigSource_LocallyManagedService(t *testing.T) {
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})
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t.Cleanup(mgr.Shutdown)
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_, _, _, err := mgr.Watch(proxyID, nodeName, token)
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_, _, _, _, err := mgr.Watch(proxyID, nodeName, token)
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require.NoError(t, err)
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}
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@ -238,13 +239,173 @@ func TestConfigSource_ErrorRegisteringService(t *testing.T) {
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})
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t.Cleanup(mgr.Shutdown)
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_, _, _, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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_, _, _, _, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.Error(t, err)
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require.True(t, canceledWatch, "watch should've been canceled")
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session.AssertCalled(t, "End")
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}
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func TestConfigSource_ErrorInSyncLoop(t *testing.T) {
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serviceID := structs.NewServiceID("web-sidecar-proxy-1", nil)
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nodeName := "node-name"
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token := "token"
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store := testStateStore(t)
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// Register the proxy in the catalog/state store at port 9999.
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require.NoError(t, store.EnsureRegistration(0, &structs.RegisterRequest{
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Node: nodeName,
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Service: &structs.NodeService{
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ID: serviceID.ID,
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Service: "web-sidecar-proxy",
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Port: 9999,
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Kind: structs.ServiceKindConnectProxy,
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Proxy: structs.ConnectProxyConfig{
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Config: map[string]any{
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"local_connect_timeout_ms": 123,
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},
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},
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},
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}))
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cfgMgr := NewMockConfigManager(t)
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{
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proxyID := proxycfg.ProxyID{
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ServiceID: serviceID,
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NodeName: nodeName,
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Token: token,
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}
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snapCh := make(chan proxysnapshot.ProxySnapshot, 1)
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cfgMgr.On("Watch", proxyID).
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Return((<-chan proxysnapshot.ProxySnapshot)(snapCh), proxysnapshot.CancelFunc(func() {}), nil)
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// Answer the register call successfully for session 1 starting (Repeatability = 1).
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// Session 2 should not have caused a re-register to happen.
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cfgMgr.On("Register", mock.Anything, mock.Anything, source, token, false).
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Run(func(args mock.Arguments) {
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id := args.Get(0).(proxycfg.ProxyID)
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ns := args.Get(1).(*structs.NodeService)
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snapCh <- &proxycfg.ConfigSnapshot{
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ProxyID: id,
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Port: ns.Port,
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Proxy: ns.Proxy,
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}
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}).
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Return(nil).
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Repeatability = 1
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// Error on subsequent registrations afterwards (during the sync loop).
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cfgMgr.On("Register", mock.Anything, mock.Anything, source, token, false).
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Return(fmt.Errorf("intentional registration error"))
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cfgMgr.On("Deregister", proxyID, source).
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Run(func(mock.Arguments) { close(snapCh) }).
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Return()
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}
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lim := NewMockSessionLimiter(t)
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session1TermCh := make(limiter.SessionTerminatedChan)
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session2TermCh := make(limiter.SessionTerminatedChan)
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{
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session1 := newMockSession(t)
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session1.On("Terminated").Return(session1TermCh)
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session1.On("End").Return()
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session2 := newMockSession(t)
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session2.On("Terminated").Return(session2TermCh)
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session2.On("End").Return()
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lim.On("BeginSession").Return(session1, nil).Once()
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lim.On("BeginSession").Return(session2, nil).Once()
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}
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mgr := NewConfigSource(Config{
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Manager: cfgMgr,
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LocalState: testLocalState(t),
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Logger: hclog.NewNullLogger(),
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GetStore: func() Store { return store },
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SessionLimiter: lim,
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})
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t.Cleanup(mgr.Shutdown)
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snapCh, termCh, cfgSrcTerminated1, cancelWatch1, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.NoError(t, err)
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require.Equal(t, session1TermCh, termCh)
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// Expect Register to have been called with the proxy's inital port.
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select {
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case snap := <-snapCh:
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require.Equal(t, 9999, snap.(*proxycfg.ConfigSnapshot).Port)
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require.Equal(t, token, snap.(*proxycfg.ConfigSnapshot).ProxyID.Token)
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case <-time.After(100 * time.Millisecond):
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t.Fatal("timeout waiting for snapshot")
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}
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// Start another watch.
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_, termCh2, cfgSrcTerminated2, cancelWatch2, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.NoError(t, err)
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require.Equal(t, session2TermCh, termCh2)
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// Expect the service to have not been re-registered by the second watch.
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select {
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case <-snapCh:
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t.Fatal("service shouldn't have been re-registered")
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case <-time.After(100 * time.Millisecond):
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}
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// Ensure that no config-source syncLoops were terminated.
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select {
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case <-cfgSrcTerminated1:
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t.Fatal("unexpected config-source termination 1")
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case <-cfgSrcTerminated2:
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t.Fatal("unexpected config-source termination 2")
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default:
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}
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// Update the proxy's port to 8888.
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// This should trigger the config-source syncLoop termination channel due to an error.
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require.NoError(t, store.EnsureRegistration(0, &structs.RegisterRequest{
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Node: nodeName,
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Service: &structs.NodeService{
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ID: serviceID.ID,
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Service: "web-sidecar-proxy",
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Port: 8888,
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Kind: structs.ServiceKindConnectProxy,
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Proxy: structs.ConnectProxyConfig{
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Config: map[string]any{
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"local_connect_timeout_ms": 123,
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},
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},
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},
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}))
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// Expect both config sources to have terminated when the syncLoop errors.
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select {
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case _, ok := <-cfgSrcTerminated1:
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cancelWatch1()
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require.False(t, ok)
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case <-time.After(100 * time.Millisecond):
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t.Fatal("timeout waiting for config-source termination 1")
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}
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select {
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case _, ok := <-cfgSrcTerminated2:
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cancelWatch2()
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require.False(t, ok)
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case <-time.After(100 * time.Millisecond):
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t.Fatal("timeout waiting for config-source termination 2")
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}
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|
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// Expect the snap channels to have been closed.
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select {
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case _, ok := <-snapCh:
|
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require.False(t, ok)
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case <-time.After(100 * time.Millisecond):
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t.Fatal("snap channel was not closed")
|
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}
|
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}
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func TestConfigSource_NotProxyService(t *testing.T) {
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serviceID := structs.NewServiceID("web", nil)
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nodeName := "node-name"
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|
|
@ -279,7 +440,7 @@ func TestConfigSource_NotProxyService(t *testing.T) {
|
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})
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t.Cleanup(mgr.Shutdown)
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|
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_, _, _, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
|
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_, _, _, _, err := mgr.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, serviceID.ID).ID(), nodeName, token)
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require.Error(t, err)
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||||
require.Contains(t, err.Error(), "must be a sidecar proxy or gateway")
|
||||
require.True(t, canceledWatch, "watch should've been canceled")
|
||||
|
|
@ -295,7 +456,7 @@ func TestConfigSource_SessionLimiterError(t *testing.T) {
|
|||
})
|
||||
t.Cleanup(src.Shutdown)
|
||||
|
||||
_, _, _, err := src.Watch(
|
||||
_, _, _, _, err := src.Watch(
|
||||
rtest.Resource(pbmesh.ProxyConfigurationType, "web-sidecar-proxy-1").ID(),
|
||||
"node-name",
|
||||
"token",
|
||||
|
|
@ -303,7 +464,7 @@ func TestConfigSource_SessionLimiterError(t *testing.T) {
|
|||
require.Equal(t, limiter.ErrCapacityReached, err)
|
||||
}
|
||||
|
||||
func testConfigManager(t *testing.T, serviceID structs.ServiceID, nodeName string, token string) ConfigManager {
|
||||
func testConfigManager(t *testing.T, serviceID structs.ServiceID, nodeName string, token string) *MockConfigManager {
|
||||
t.Helper()
|
||||
|
||||
cfgMgr := NewMockConfigManager(t)
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
// Code generated by mockery v2.33.1. DO NOT EDIT.
|
||||
// Code generated by mockery v2.37.1. DO NOT EDIT.
|
||||
|
||||
package catalog
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
// Code generated by mockery v2.33.1. DO NOT EDIT.
|
||||
// Code generated by mockery v2.37.1. DO NOT EDIT.
|
||||
|
||||
package catalog
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
// Code generated by mockery v2.33.1. DO NOT EDIT.
|
||||
// Code generated by mockery v2.37.1. DO NOT EDIT.
|
||||
|
||||
package catalog
|
||||
|
||||
|
|
@ -8,6 +8,8 @@ import (
|
|||
|
||||
pbresource "github.com/hashicorp/consul/proto-public/pbresource"
|
||||
|
||||
proxycfg "github.com/hashicorp/consul/agent/proxycfg"
|
||||
|
||||
proxysnapshot "github.com/hashicorp/consul/internal/mesh/proxy-snapshot"
|
||||
)
|
||||
|
||||
|
|
@ -17,14 +19,15 @@ type MockWatcher struct {
|
|||
}
|
||||
|
||||
// Watch provides a mock function with given fields: proxyID, nodeName, token
|
||||
func (_m *MockWatcher) Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
func (_m *MockWatcher) Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
ret := _m.Called(proxyID, nodeName, token)
|
||||
|
||||
var r0 <-chan proxysnapshot.ProxySnapshot
|
||||
var r1 limiter.SessionTerminatedChan
|
||||
var r2 proxysnapshot.CancelFunc
|
||||
var r3 error
|
||||
if rf, ok := ret.Get(0).(func(*pbresource.ID, string, string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error)); ok {
|
||||
var r2 proxycfg.SrcTerminatedChan
|
||||
var r3 proxysnapshot.CancelFunc
|
||||
var r4 error
|
||||
if rf, ok := ret.Get(0).(func(*pbresource.ID, string, string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error)); ok {
|
||||
return rf(proxyID, nodeName, token)
|
||||
}
|
||||
if rf, ok := ret.Get(0).(func(*pbresource.ID, string, string) <-chan proxysnapshot.ProxySnapshot); ok {
|
||||
|
|
@ -43,21 +46,29 @@ func (_m *MockWatcher) Watch(proxyID *pbresource.ID, nodeName string, token stri
|
|||
}
|
||||
}
|
||||
|
||||
if rf, ok := ret.Get(2).(func(*pbresource.ID, string, string) proxysnapshot.CancelFunc); ok {
|
||||
if rf, ok := ret.Get(2).(func(*pbresource.ID, string, string) proxycfg.SrcTerminatedChan); ok {
|
||||
r2 = rf(proxyID, nodeName, token)
|
||||
} else {
|
||||
if ret.Get(2) != nil {
|
||||
r2 = ret.Get(2).(proxysnapshot.CancelFunc)
|
||||
r2 = ret.Get(2).(proxycfg.SrcTerminatedChan)
|
||||
}
|
||||
}
|
||||
|
||||
if rf, ok := ret.Get(3).(func(*pbresource.ID, string, string) error); ok {
|
||||
if rf, ok := ret.Get(3).(func(*pbresource.ID, string, string) proxysnapshot.CancelFunc); ok {
|
||||
r3 = rf(proxyID, nodeName, token)
|
||||
} else {
|
||||
r3 = ret.Error(3)
|
||||
if ret.Get(3) != nil {
|
||||
r3 = ret.Get(3).(proxysnapshot.CancelFunc)
|
||||
}
|
||||
}
|
||||
|
||||
return r0, r1, r2, r3
|
||||
if rf, ok := ret.Get(4).(func(*pbresource.ID, string, string) error); ok {
|
||||
r4 = rf(proxyID, nodeName, token)
|
||||
} else {
|
||||
r4 = ret.Error(4)
|
||||
}
|
||||
|
||||
return r0, r1, r2, r3, r4
|
||||
}
|
||||
|
||||
// NewMockWatcher creates a new instance of MockWatcher. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
|
||||
|
|
|
|||
|
|
@ -23,8 +23,13 @@ func NewConfigSource(cfgMgr ConfigManager) *ConfigSource {
|
|||
return &ConfigSource{cfgMgr}
|
||||
}
|
||||
|
||||
func (m *ConfigSource) Watch(proxyID *pbresource.ID, nodeName string, _ string) (<-chan proxysnapshot.ProxySnapshot,
|
||||
limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
func (m *ConfigSource) Watch(proxyID *pbresource.ID, nodeName string, _ string) (
|
||||
<-chan proxysnapshot.ProxySnapshot,
|
||||
limiter.SessionTerminatedChan,
|
||||
proxycfg.SrcTerminatedChan,
|
||||
proxysnapshot.CancelFunc,
|
||||
error,
|
||||
) {
|
||||
serviceID := structs.NewServiceID(proxyID.Name, catalog.GetEnterpriseMetaFromResourceID(proxyID))
|
||||
watchCh, cancelWatch := m.manager.Watch(proxycfg.ProxyID{
|
||||
ServiceID: serviceID,
|
||||
|
|
@ -36,5 +41,5 @@ func (m *ConfigSource) Watch(proxyID *pbresource.ID, nodeName string, _ string)
|
|||
// is checked before the watch is created).
|
||||
Token: "",
|
||||
})
|
||||
return watchCh, nil, cancelWatch, nil
|
||||
return watchCh, nil, nil, cancelWatch, nil
|
||||
}
|
||||
|
|
|
|||
|
|
@ -5,10 +5,11 @@ package proxycfg
|
|||
|
||||
import (
|
||||
"errors"
|
||||
"github.com/hashicorp/consul/lib/channels"
|
||||
"runtime/debug"
|
||||
"sync"
|
||||
|
||||
"github.com/hashicorp/consul/lib/channels"
|
||||
|
||||
"github.com/hashicorp/go-hclog"
|
||||
"golang.org/x/time/rate"
|
||||
|
||||
|
|
@ -38,6 +39,10 @@ type ProxyID struct {
|
|||
// from overwriting each other's registrations.
|
||||
type ProxySource string
|
||||
|
||||
// SrcTerminatedChan indicates that the config-source for the proxycfg is no longer running
|
||||
// and will stop receiving updates when it is closed.
|
||||
type SrcTerminatedChan <-chan struct{}
|
||||
|
||||
// Manager provides an API with which proxy services can be registered, and
|
||||
// coordinates the fetching (and refreshing) of intentions, upstreams, discovery
|
||||
// chain, certificates etc.
|
||||
|
|
|
|||
|
|
@ -87,7 +87,7 @@ func TestAgent_local_proxycfg(t *testing.T) {
|
|||
// Prior to fixes in https://github.com/hashicorp/consul/pull/16497
|
||||
// this call to Watch() would deadlock.
|
||||
var err error
|
||||
ch, stc, cancel, err = cfg.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, sid.ID).ID(), a.config.NodeName, token)
|
||||
ch, stc, _, cancel, err = cfg.Watch(rtest.Resource(pbmesh.ProxyConfigurationType, sid.ID).ID(), a.config.NodeName, token)
|
||||
require.NoError(t, err)
|
||||
}
|
||||
select {
|
||||
|
|
|
|||
|
|
@ -43,6 +43,7 @@ import (
|
|||
)
|
||||
|
||||
var errOverwhelmed = status.Error(codes.ResourceExhausted, "this server has too many xDS streams open, please try another")
|
||||
var errConfigSyncError = status.Errorf(codes.Internal, "config-source sync loop terminated due to error")
|
||||
|
||||
// xdsProtocolLegacyChildResend enables the legacy behavior for the `ensureChildResend` function.
|
||||
// This environment variable exists as an escape hatch so that users can disable the behavior, if needed.
|
||||
|
|
@ -144,13 +145,14 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
|
|||
|
||||
// Loop state
|
||||
var (
|
||||
proxySnapshot proxysnapshot.ProxySnapshot
|
||||
node *envoy_config_core_v3.Node
|
||||
stateCh <-chan proxysnapshot.ProxySnapshot
|
||||
drainCh limiter.SessionTerminatedChan
|
||||
watchCancel func()
|
||||
nonce uint64 // xDS requires a unique nonce to correlate response/request pairs
|
||||
ready bool // set to true after the first snapshot arrives
|
||||
proxySnapshot proxysnapshot.ProxySnapshot
|
||||
node *envoy_config_core_v3.Node
|
||||
stateCh <-chan proxysnapshot.ProxySnapshot
|
||||
drainCh limiter.SessionTerminatedChan
|
||||
cfgSrcTerminated proxycfg.SrcTerminatedChan
|
||||
watchCancel func()
|
||||
nonce uint64 // xDS requires a unique nonce to correlate response/request pairs
|
||||
ready bool // set to true after the first snapshot arrives
|
||||
|
||||
streamStartTime = time.Now()
|
||||
streamStartOnce sync.Once
|
||||
|
|
@ -309,6 +311,12 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
|
|||
resourceMap = newResourceMap
|
||||
currentVersions = newVersions
|
||||
ready = true
|
||||
case <-cfgSrcTerminated:
|
||||
// Ensure that we cancel and cleanup resources if the sync loop terminates for any reason.
|
||||
// This is necessary to handle the scenario where an unexpected error occurs that the loop
|
||||
// cannot recover from.
|
||||
logger.Debug("config-source sync loop terminated due to error")
|
||||
return errConfigSyncError
|
||||
}
|
||||
|
||||
// Trigger state machine
|
||||
|
|
@ -335,7 +343,7 @@ func (s *Server) processDelta(stream ADSDeltaStream, reqCh <-chan *envoy_discove
|
|||
return status.Errorf(codes.Internal, "failed to watch proxy service: %s", err)
|
||||
}
|
||||
|
||||
stateCh, drainCh, watchCancel, err = s.ProxyWatcher.Watch(proxyID, nodeName, options.Token)
|
||||
stateCh, drainCh, cfgSrcTerminated, watchCancel, err = s.ProxyWatcher.Watch(proxyID, nodeName, options.Token)
|
||||
switch {
|
||||
case errors.Is(err, limiter.ErrCapacityReached):
|
||||
return errOverwhelmed
|
||||
|
|
|
|||
|
|
@ -1608,6 +1608,34 @@ func TestServer_DeltaAggregatedResources_v3_CapacityReached(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
func TestServer_DeltaAggregatedResources_v3_CfgSrcTerminated(t *testing.T) {
|
||||
aclResolve := func(id string) (acl.Authorizer, error) { return acl.ManageAll(), nil }
|
||||
|
||||
scenario := newTestServerDeltaScenario(t, aclResolve, "web-sidecar-proxy", "", 0)
|
||||
mgr, errCh, envoy := scenario.mgr, scenario.errCh, scenario.envoy
|
||||
|
||||
sid := structs.NewServiceID("web-sidecar-proxy", nil)
|
||||
|
||||
mgr.RegisterProxy(t, sid)
|
||||
|
||||
snap := newTestSnapshot(t, nil, "", nil)
|
||||
envoy.SendDeltaReq(t, xdscommon.ClusterType, &envoy_discovery_v3.DeltaDiscoveryRequest{
|
||||
InitialResourceVersions: mustMakeVersionMap(t,
|
||||
makeTestCluster(t, snap, "tcp:geo-cache"),
|
||||
),
|
||||
})
|
||||
mgr.CfgSrcTerminate(sid)
|
||||
|
||||
select {
|
||||
case err := <-errCh:
|
||||
require.Error(t, err)
|
||||
require.Equal(t, codes.Internal.String(), status.Code(err).String())
|
||||
require.Equal(t, errConfigSyncError, err)
|
||||
case <-time.After(50 * time.Millisecond):
|
||||
t.Fatalf("timed out waiting for handler to finish")
|
||||
}
|
||||
}
|
||||
|
||||
type capacityReachedLimiter struct{}
|
||||
|
||||
func (capacityReachedLimiter) BeginSession() (limiter.Session, error) {
|
||||
|
|
|
|||
|
|
@ -20,9 +20,10 @@ import (
|
|||
"github.com/hashicorp/consul/acl"
|
||||
external "github.com/hashicorp/consul/agent/grpc-external"
|
||||
"github.com/hashicorp/consul/agent/grpc-external/limiter"
|
||||
"github.com/hashicorp/consul/agent/proxycfg"
|
||||
"github.com/hashicorp/consul/agent/xds/configfetcher"
|
||||
"github.com/hashicorp/consul/envoyextensions/xdscommon"
|
||||
"github.com/hashicorp/consul/internal/mesh/proxy-snapshot"
|
||||
proxysnapshot "github.com/hashicorp/consul/internal/mesh/proxy-snapshot"
|
||||
"github.com/hashicorp/consul/proto-public/pbresource"
|
||||
)
|
||||
|
||||
|
|
@ -83,7 +84,7 @@ type ACLResolverFunc func(id string) (acl.Authorizer, error)
|
|||
// ProxyConfigSource is the interface xds.Server requires to consume proxy
|
||||
// config updates.
|
||||
type ProxyWatcher interface {
|
||||
Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error)
|
||||
Watch(proxyID *pbresource.ID, nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot, limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error)
|
||||
}
|
||||
|
||||
// Server represents a gRPC server that can handle xDS requests from Envoy. All
|
||||
|
|
|
|||
|
|
@ -73,16 +73,18 @@ func newTestSnapshot(
|
|||
// testing. It also implements ConnectAuthz to allow control over authorization.
|
||||
type testManager struct {
|
||||
sync.Mutex
|
||||
stateChans map[structs.ServiceID]chan proxysnapshot.ProxySnapshot
|
||||
drainChans map[structs.ServiceID]chan struct{}
|
||||
cancels chan structs.ServiceID
|
||||
stateChans map[structs.ServiceID]chan proxysnapshot.ProxySnapshot
|
||||
drainChans map[structs.ServiceID]chan struct{}
|
||||
cfgSrcTerminateChans map[structs.ServiceID]chan struct{}
|
||||
cancels chan structs.ServiceID
|
||||
}
|
||||
|
||||
func newTestManager(t *testing.T) *testManager {
|
||||
return &testManager{
|
||||
stateChans: map[structs.ServiceID]chan proxysnapshot.ProxySnapshot{},
|
||||
drainChans: map[structs.ServiceID]chan struct{}{},
|
||||
cancels: make(chan structs.ServiceID, 10),
|
||||
stateChans: map[structs.ServiceID]chan proxysnapshot.ProxySnapshot{},
|
||||
drainChans: map[structs.ServiceID]chan struct{}{},
|
||||
cfgSrcTerminateChans: map[structs.ServiceID]chan struct{}{},
|
||||
cancels: make(chan structs.ServiceID, 10),
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -92,6 +94,7 @@ func (m *testManager) RegisterProxy(t *testing.T, proxyID structs.ServiceID) {
|
|||
defer m.Unlock()
|
||||
m.stateChans[proxyID] = make(chan proxysnapshot.ProxySnapshot, 1)
|
||||
m.drainChans[proxyID] = make(chan struct{})
|
||||
m.cfgSrcTerminateChans[proxyID] = make(chan struct{})
|
||||
}
|
||||
|
||||
// Deliver simulates a proxy registration
|
||||
|
|
@ -121,9 +124,23 @@ func (m *testManager) DrainStreams(proxyID structs.ServiceID) {
|
|||
close(ch)
|
||||
}
|
||||
|
||||
// CfgSrcTerminate terminates any open streams for the given proxyID by indicating that the
|
||||
// corresponding config-source terminated unexpectedly.
|
||||
func (m *testManager) CfgSrcTerminate(proxyID structs.ServiceID) {
|
||||
m.Lock()
|
||||
defer m.Unlock()
|
||||
|
||||
ch, ok := m.cfgSrcTerminateChans[proxyID]
|
||||
if !ok {
|
||||
ch = make(chan struct{})
|
||||
m.cfgSrcTerminateChans[proxyID] = ch
|
||||
}
|
||||
close(ch)
|
||||
}
|
||||
|
||||
// Watch implements ConfigManager
|
||||
func (m *testManager) Watch(id *pbresource.ID, _ string, _ string) (<-chan proxysnapshot.ProxySnapshot,
|
||||
limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
limiter.SessionTerminatedChan, proxycfg.SrcTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
// Create service ID
|
||||
proxyID := structs.NewServiceID(id.Name, catalog.GetEnterpriseMetaFromResourceID(id))
|
||||
m.Lock()
|
||||
|
|
@ -133,12 +150,12 @@ func (m *testManager) Watch(id *pbresource.ID, _ string, _ string) (<-chan proxy
|
|||
drainCh := m.drainChans[proxyID]
|
||||
select {
|
||||
case <-drainCh:
|
||||
return nil, nil, nil, limiter.ErrCapacityReached
|
||||
return nil, nil, nil, nil, limiter.ErrCapacityReached
|
||||
default:
|
||||
}
|
||||
|
||||
// ch might be nil but then it will just block forever
|
||||
return m.stateChans[proxyID], drainCh, func() {
|
||||
return m.stateChans[proxyID], drainCh, m.cfgSrcTerminateChans[proxyID], func() {
|
||||
m.cancels <- proxyID
|
||||
}, nil
|
||||
}
|
||||
|
|
|
|||
|
|
@ -6,12 +6,14 @@ package proxytracker
|
|||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"github.com/hashicorp/consul/lib/channels"
|
||||
"sync"
|
||||
|
||||
"github.com/hashicorp/consul/lib/channels"
|
||||
|
||||
"github.com/hashicorp/go-hclog"
|
||||
|
||||
"github.com/hashicorp/consul/agent/grpc-external/limiter"
|
||||
"github.com/hashicorp/consul/agent/proxycfg"
|
||||
"github.com/hashicorp/consul/internal/controller"
|
||||
proxysnapshot "github.com/hashicorp/consul/internal/mesh/proxy-snapshot"
|
||||
"github.com/hashicorp/consul/internal/resource"
|
||||
|
|
@ -87,13 +89,17 @@ func NewProxyTracker(cfg ProxyTrackerConfig) *ProxyTracker {
|
|||
|
||||
// Watch connects a proxy with ProxyTracker and returns the consumer a channel to receive updates,
|
||||
// a channel to notify of xDS terminated session, and a cancel function to cancel the watch.
|
||||
func (pt *ProxyTracker) Watch(proxyID *pbresource.ID,
|
||||
nodeName string, token string) (<-chan proxysnapshot.ProxySnapshot,
|
||||
limiter.SessionTerminatedChan, proxysnapshot.CancelFunc, error) {
|
||||
func (pt *ProxyTracker) Watch(proxyID *pbresource.ID, nodeName string, token string) (
|
||||
<-chan proxysnapshot.ProxySnapshot,
|
||||
limiter.SessionTerminatedChan,
|
||||
proxycfg.SrcTerminatedChan,
|
||||
proxysnapshot.CancelFunc,
|
||||
error,
|
||||
) {
|
||||
pt.config.Logger.Trace("watch initiated", "proxyID", proxyID, "nodeName", nodeName)
|
||||
if err := pt.validateWatchArgs(proxyID, nodeName); err != nil {
|
||||
pt.config.Logger.Error("args failed validation", err)
|
||||
return nil, nil, nil, err
|
||||
return nil, nil, nil, nil, err
|
||||
}
|
||||
// Begin a session with the xDS session concurrency limiter.
|
||||
//
|
||||
|
|
@ -101,7 +107,7 @@ func (pt *ProxyTracker) Watch(proxyID *pbresource.ID,
|
|||
session, err := pt.config.SessionLimiter.BeginSession()
|
||||
if err != nil {
|
||||
pt.config.Logger.Error("failed to begin session with xDS session concurrency limiter", err)
|
||||
return nil, nil, nil, err
|
||||
return nil, nil, nil, nil, err
|
||||
}
|
||||
|
||||
// This buffering is crucial otherwise we'd block immediately trying to
|
||||
|
|
@ -132,11 +138,11 @@ func (pt *ProxyTracker) Watch(proxyID *pbresource.ID,
|
|||
if err != nil {
|
||||
pt.config.Logger.Error("failed to notify controller of new proxy connection", err)
|
||||
pt.cancelWatchLocked(proxyReferenceKey, watchData.notifyCh, session)
|
||||
return nil, nil, nil, err
|
||||
return nil, nil, nil, nil, err
|
||||
}
|
||||
pt.config.Logger.Trace("controller notified of watch created", "proxyID", proxyID, "nodeName", nodeName)
|
||||
|
||||
return proxyStateChan, session.Terminated(), cancel, nil
|
||||
return proxyStateChan, session.Terminated(), nil, cancel, nil
|
||||
}
|
||||
|
||||
// notifyNewProxyChannel attempts to send a message to newProxyConnectionCh and will return an error if there's no receiver.
|
||||
|
|
|
|||
|
|
@ -37,7 +37,7 @@ func TestProxyTracker_Watch(t *testing.T) {
|
|||
})
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, _, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
proxyStateChan, _, _, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
require.NoError(t, err)
|
||||
|
||||
// ensure New Proxy Connection message is sent
|
||||
|
|
@ -91,7 +91,7 @@ func TestProxyTracker_Watch_ErrorConsumerNotReady(t *testing.T) {
|
|||
}
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, sessionTerminatedCh, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
proxyStateChan, sessionTerminatedCh, _, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
require.Nil(t, cancelFunc)
|
||||
require.Nil(t, proxyStateChan)
|
||||
require.Nil(t, sessionTerminatedCh)
|
||||
|
|
@ -146,7 +146,7 @@ func TestProxyTracker_Watch_ArgValidationErrors(t *testing.T) {
|
|||
})
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, sessionTerminateCh, cancelFunc, err := pt.Watch(tc.proxyID, tc.nodeName, tc.token)
|
||||
proxyStateChan, sessionTerminateCh, _, cancelFunc, err := pt.Watch(tc.proxyID, tc.nodeName, tc.token)
|
||||
require.Error(t, err)
|
||||
require.Equal(t, tc.expectedError, err)
|
||||
require.Nil(t, proxyStateChan)
|
||||
|
|
@ -166,7 +166,7 @@ func TestProxyTracker_Watch_SessionLimiterError(t *testing.T) {
|
|||
})
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, sessionTerminateCh, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
proxyStateChan, sessionTerminateCh, _, cancelFunc, err := pt.Watch(resourceID, "node 1", "token")
|
||||
require.Error(t, err)
|
||||
require.Equal(t, "kaboom", err.Error())
|
||||
require.Nil(t, proxyStateChan)
|
||||
|
|
@ -190,7 +190,7 @@ func TestProxyTracker_PushChange(t *testing.T) {
|
|||
})
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, _, _, err := pt.Watch(resourceID, "node 1", "token")
|
||||
proxyStateChan, _, _, _, err := pt.Watch(resourceID, "node 1", "token")
|
||||
require.NoError(t, err)
|
||||
|
||||
// PushChange
|
||||
|
|
@ -255,7 +255,7 @@ func TestProxyTracker_ProxyConnectedToServer(t *testing.T) {
|
|||
session.On("Terminated").Return(channel).Maybe()
|
||||
session.On("End").Return().Maybe()
|
||||
limiter.On("BeginSession").Return(session, nil)
|
||||
_, _, _, _ = pt.Watch(resourceID, "node 1", "token")
|
||||
_, _, _, _, _ = pt.Watch(resourceID, "node 1", "token")
|
||||
},
|
||||
},
|
||||
}
|
||||
|
|
@ -294,7 +294,7 @@ func TestProxyTracker_Shutdown(t *testing.T) {
|
|||
})
|
||||
|
||||
// Watch()
|
||||
proxyStateChan, _, _, err := pt.Watch(resourceID, "node 1", "token")
|
||||
proxyStateChan, _, _, _, err := pt.Watch(resourceID, "node 1", "token")
|
||||
require.NoError(t, err)
|
||||
|
||||
pt.Shutdown()
|
||||
|
|
|
|||
Loading…
Reference in New Issue