95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
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package containerd
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import (
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"sync"
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"golang.org/x/net/context"
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)
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func newCollector(ctx context.Context, runtimes map[string]Runtime) (*collector, error) {
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c := &collector{
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context: ctx,
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ch: make(chan *Event, 2048),
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eventClients: make(map[*eventClient]struct{}),
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}
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for _, r := range runtimes {
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if err := c.collect(r); err != nil {
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return nil, err
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}
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}
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// run the publisher
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go c.publisher()
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// run a goroutine that waits for the context to be done
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// and closes the channel after all writes have finished
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go c.waitDone()
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return c, nil
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}
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type eventClient struct {
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eCh chan error
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w EventWriter
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}
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type collector struct {
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mu sync.Mutex
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wg sync.WaitGroup
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context context.Context
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ch chan *Event
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eventClients map[*eventClient]struct{}
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}
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// collect collects events from the provided runtime
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func (c *collector) collect(r Runtime) error {
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c.wg.Add(1)
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go func() {
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defer c.wg.Done()
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for e := range r.Events(c.context) {
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c.ch <- e
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}
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}()
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return nil
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}
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// Forward forwards all events from the collector to the EventWriters
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//
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// It forwards events until the channels are closed or the EventWriter
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// returns an error
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// This is a blocking call
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func (c *collector) forward(w EventWriter) (err error) {
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client := &eventClient{
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w: w,
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eCh: make(chan error, 1),
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}
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c.mu.Lock()
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c.eventClients[client] = struct{}{}
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c.mu.Unlock()
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if serr := <-client.eCh; serr != nil {
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err = serr
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}
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c.mu.Lock()
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delete(c.eventClients, client)
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c.mu.Unlock()
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return err
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}
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func (c *collector) publisher() {
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for e := range c.ch {
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c.mu.Lock()
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for client := range c.eventClients {
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if err := client.w.Write(e); err != nil {
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client.eCh <- err
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}
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}
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c.mu.Unlock()
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}
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}
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// waitDone waits for the context to finish, waits for all the goroutines to finish
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// collecting grpc events from the shim, and closes the output channel
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func (c *collector) waitDone() {
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<-c.context.Done()
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c.wg.Wait()
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close(c.ch)
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}
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