mirror of https://github.com/docker/docs.git
79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
package api
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import (
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"fmt"
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"io"
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"net/http"
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"sync"
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"github.com/docker/swarm/cluster"
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)
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type eventsHandler struct {
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sync.RWMutex
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ws map[string]io.Writer
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cs map[string]chan struct{}
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}
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// NewEventsHandler creates a new eventsHandler for a cluster.
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// The new eventsHandler is initialized with no writers or channels.
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func NewEventsHandler() *eventsHandler {
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return &eventsHandler{
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ws: make(map[string]io.Writer),
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cs: make(map[string]chan struct{}),
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}
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}
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// Add adds the writer and a new channel for the remote address.
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func (eh *eventsHandler) Add(remoteAddr string, w io.Writer) {
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eh.Lock()
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eh.ws[remoteAddr] = w
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eh.cs[remoteAddr] = make(chan struct{})
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eh.Unlock()
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}
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// Wait waits on a signal from the remote address.
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func (eh *eventsHandler) Wait(remoteAddr string) {
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<-eh.cs[remoteAddr]
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}
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// Handle writes information about a cluster event to each remote address in the cluster that has been added to the events handler.
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// After a successful write to a remote address, the associated channel is closed and the address is removed from the events handler.
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func (eh *eventsHandler) Handle(e *cluster.Event) error {
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eh.RLock()
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str := fmt.Sprintf("{%q:%q,%q:%q,%q:%q,%q:%d,%q:{%q:%q,%q:%q,%q:%q,%q:%q}}",
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"status", e.Status,
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"id", e.Id,
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"from", e.From+" node:"+e.Engine.Name,
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"time", e.Time,
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"node",
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"Name", e.Engine.Name,
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"Id", e.Engine.ID,
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"Addr", e.Engine.Addr,
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"Ip", e.Engine.IP)
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for key, w := range eh.ws {
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if _, err := fmt.Fprintf(w, str); err != nil {
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close(eh.cs[key])
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delete(eh.ws, key)
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delete(eh.cs, key)
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continue
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}
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if f, ok := w.(http.Flusher); ok {
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f.Flush()
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}
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}
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eh.RUnlock()
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return nil
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}
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// Size returns the number of remote addresses that the events handler currently contains.
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func (eh *eventsHandler) Size() int {
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eh.RLock()
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defer eh.RUnlock()
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return len(eh.ws)
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}
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