78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
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package api
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import (
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"strconv"
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"sync"
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"time"
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)
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// rememberedTitles bounds the title memory below. A household plays a handful of things
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// at once; this is generous enough that a report always finds its title and small enough
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// that a hostile client cannot grow it into a leak.
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const rememberedTitles = 256
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// playbackTitles remembers what each item was called when the player asked to play it.
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//
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// Progress and stop reports carry an item id and nothing else — the client already knows
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// the title and has no reason to send it back — so without this every playback event
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// after the first reads as an opaque GUID. Deliberately in memory and deliberately lossy:
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// a restarted gateway logs an id until the next play, which is a better trade than a
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// round trip to Emby on a report the viewer never sees.
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type playbackTitles struct {
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mu sync.Mutex
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titles map[string]string
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order []string
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}
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func (p *playbackTitles) remember(itemID, title string) {
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if itemID == "" || title == "" {
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return
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}
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p.mu.Lock()
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defer p.mu.Unlock()
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if p.titles == nil {
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p.titles = make(map[string]string, rememberedTitles)
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}
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if _, known := p.titles[itemID]; !known {
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p.order = append(p.order, itemID)
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if len(p.order) > rememberedTitles {
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delete(p.titles, p.order[0])
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p.order = p.order[1:]
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}
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}
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p.titles[itemID] = title
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}
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// name falls back to the id rather than an empty field: a line that says which item it
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// could not name is still usable.
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func (p *playbackTitles) name(itemID string) string {
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p.mu.Lock()
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defer p.mu.Unlock()
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if title, known := p.titles[itemID]; known {
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return title
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}
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return itemID
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}
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// millisecondDuration renders a playhead as "1h42m30s" rather than a seven-digit
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// millisecond count, which no one can read at a glance.
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func millisecondDuration(milliseconds int64) time.Duration {
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return (time.Duration(max64(milliseconds, 0)) * time.Millisecond).Round(time.Second)
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}
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// watchedPercent is how a stop is read at a glance: "did they finish it, or give up?"
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func watchedPercent(positionMs, durationMs int64) string {
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if durationMs <= 0 {
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return "unknown"
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}
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percent := max64(positionMs, 0) * 100 / durationMs
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return strconv.FormatInt(min64(percent, 100), 10) + "%"
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}
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func min64(v, ceiling int64) int64 {
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if v > ceiling {
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return ceiling
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}
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return v
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}
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