wehub-resource-sync
71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
package ipc
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import (
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"bufio"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"time"
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)
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// StreamBands holds one IPC connection open and writes one NDJSON line per
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// tick containing the current visualizer bands and mode. It exits cleanly
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// when ctx is cancelled or the server closes the socket.
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func StreamBands(ctx context.Context, sockPath string, interval time.Duration, out io.Writer) error {
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if interval <= 0 {
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interval = 33 * time.Millisecond
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}
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conn, err := dialSocket(sockPath, 3*time.Second)
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if err != nil {
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if isSocketUnavailable(err) {
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return fmt.Errorf("cliamp is not running (no socket at %s)", sockPath)
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}
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return fmt.Errorf("connect: %w", err)
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}
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defer conn.Close()
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reqLine, err := json.Marshal(Request{Cmd: "bands"})
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if err != nil {
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return fmt.Errorf("marshal request: %w", err)
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}
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reqLine = append(reqLine, '\n')
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scanner := bufio.NewScanner(conn)
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scanner.Buffer(make([]byte, 64*1024), 1024*1024)
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ticker := time.NewTicker(interval)
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defer ticker.Stop()
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// Reused per-frame buffer so we make one out.Write call per line.
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frame := make([]byte, 0, 512)
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for {
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select {
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case <-ctx.Done():
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return nil
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case <-ticker.C:
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}
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conn.SetWriteDeadline(time.Now().Add(2 * time.Second))
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if _, err := conn.Write(reqLine); err != nil {
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return fmt.Errorf("write: %w", err)
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}
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conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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if !scanner.Scan() {
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if err := scanner.Err(); err != nil {
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return fmt.Errorf("read: %w", err)
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}
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return nil
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}
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// Pass the response through as-is; it is already NDJSON.
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frame = append(frame[:0], scanner.Bytes()...)
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frame = append(frame, '\n')
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if _, err := out.Write(frame); err != nil {
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return err
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}
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}
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}
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