Henry
e75c8b37c8
Co-authored-by: nova28 <17953305+nova28@users.noreply.github.com> Co-authored-by: Carlos Florencio <carlosmflorencio@gmail.com>
35 lines
1.4 KiB
Go
35 lines
1.4 KiB
Go
package process
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// attachedCount tracks how many live backend event-stream connections
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// (/agent/stream) this instance currently has. It is a count rather than a
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// single flag so an overlapping reconnect -- a new connection arriving
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// before the old one's teardown has run -- cannot make IsAttached report
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// false while a connection is still actually live.
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//
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// This is the agentctl-local "instance is attached" signal design 03
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// requires: an instance is attached when its event stream to the owning
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// backend is established, evaluated at INSTANCE granularity (not "the
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// server has an owning backend", which is true during the window after
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// adoption and before this instance's own stream reconnects -- exactly the
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// window a permission request must not be auto-denied in).
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// MarkAttached records that a backend event-stream connection is now live
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// for this instance. Called by the /agent/stream handler once the
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// WebSocket upgrade succeeds.
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func (m *Manager) MarkAttached() {
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m.attachedCount.Add(1)
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}
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// MarkDetached records that a backend event-stream connection for this
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// instance has ended. Called by the /agent/stream handler when the
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// connection closes, for symmetry with MarkAttached.
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func (m *Manager) MarkDetached() {
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m.attachedCount.Add(-1)
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}
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// IsAttached reports whether this instance currently has at least one live
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// backend event-stream connection.
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func (m *Manager) IsAttached() bool {
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return m.attachedCount.Load() > 0
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}
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