20 lines
820 B
Go
20 lines
820 B
Go
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package download
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// GlobalDownloadGate wraps a GatedSemaphore for download-specific concurrency control.
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// See internal/middleware/rate_limit.go for the underlying GatedSemaphore implementation.
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//
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// The gate ensures that the total number of concurrent download streams never exceeds
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// the configured limit (default 50), which keeps total bandwidth usage under 10 Mbps
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// when each stream is throttled to ~25 KB/s.
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type GlobalDownloadGate struct {
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sem chan struct{}
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}
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func NewGlobalDownloadGate(maxConcurrent int) *GlobalDownloadGate {
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return &GlobalDownloadGate{sem: make(chan struct{}, maxConcurrent)}
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}
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func (g *GlobalDownloadGate) Acquire() { g.sem <- struct{}{} }
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func (g *GlobalDownloadGate) Release() { <-g.sem }
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func (g *GlobalDownloadGate) Available() int { return cap(g.sem) - len(g.sem) }
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