mirror of
https://github.com/gravitational/teleport.git
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rosstimothy
f5d254259b
This adds a test, `TestCacheWatchKindExistsInEvents`, that ensures all `types.WatchKind` registered for all Cache components have a corresponding `proto.Event` defined. By doing this we can ensure that for a release there will be no `resource type X is not suppported` errors causing the Cache to be unhealthy. Unfortunately this does not prevent issues across releases which may have different resources being emitted.
113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
/*
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Copyright 2020 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package client
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import (
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"context"
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"sync"
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"github.com/gravitational/teleport/api/client/proto"
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"github.com/gravitational/teleport/api/types"
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"github.com/gravitational/trace"
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"github.com/gravitational/trace/trail"
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)
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// NewWatcher returns a new streamWatcher
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func (c *Client) NewWatcher(ctx context.Context, watch types.Watch) (types.Watcher, error) {
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cancelCtx, cancel := context.WithCancel(ctx)
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var protoWatch proto.Watch
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for _, kind := range watch.Kinds {
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protoWatch.Kinds = append(protoWatch.Kinds, proto.FromWatchKind(kind))
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}
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stream, err := c.grpc.WatchEvents(cancelCtx, &protoWatch, c.callOpts...)
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if err != nil {
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cancel()
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return nil, trail.FromGRPC(err)
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}
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w := &streamWatcher{
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stream: stream,
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ctx: cancelCtx,
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cancel: cancel,
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eventsC: make(chan types.Event),
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}
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go w.receiveEvents()
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return w, nil
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}
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type streamWatcher struct {
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mu sync.RWMutex
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stream proto.AuthService_WatchEventsClient
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ctx context.Context
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cancel context.CancelFunc
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eventsC chan types.Event
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err error
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}
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// Error returns the streamWatcher's error
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func (w *streamWatcher) Error() error {
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w.mu.RLock()
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defer w.mu.RUnlock()
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if w.err == nil {
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return trace.Wrap(w.ctx.Err())
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}
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return w.err
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}
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func (w *streamWatcher) closeWithError(err error) {
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w.mu.Lock()
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defer w.mu.Unlock()
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w.Close()
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w.err = err
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}
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// Events returns the streamWatcher's events channel
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func (w *streamWatcher) Events() <-chan types.Event {
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return w.eventsC
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}
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func (w *streamWatcher) receiveEvents() {
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for {
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event, err := w.stream.Recv()
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if err != nil {
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w.closeWithError(trail.FromGRPC(err))
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return
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}
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out, err := EventFromGRPC(*event)
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if err != nil {
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w.closeWithError(trail.FromGRPC(err))
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return
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}
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select {
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case w.eventsC <- *out:
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case <-w.Done():
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return
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}
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}
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}
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// Done returns a channel that closes once the streamWatcher is Closed
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func (w *streamWatcher) Done() <-chan struct{} {
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return w.ctx.Done()
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}
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// Close the streamWatcher
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func (w *streamWatcher) Close() error {
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w.cancel()
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return nil
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}
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