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package bilibili
import (
"bilibili-livestream-archiver/common"
"context"
"errors"
"fmt"
"io"
"net/http"
"strings"
)
// CopyLiveStream read data from a livestream video stream, copy them to a writer.
func (b Bilibili) CopyLiveStream(
ctx context.Context,
roomId common.RoomId,
stream StreamingUrlInfo,
out io.Writer,
) (err error) {
url := stream.URL
if !strings.HasPrefix(url, "https://") &&
!strings.HasPrefix(url, "http://") {
return fmt.Errorf("invalid URL: %v", url)
}
r, err := b.newGet(url)
if err != nil {
b.error.Printf("Cannot create HTTP GET instance on %v: %v", url, err)
return err
}
r.Header.Set("Referer",
fmt.Sprintf("https://live.bilibili.com/blanc/%d?liteVersion=true", roomId))
resp, err := b.Do(r)
if err != nil {
b.error.Printf("Cannot make HTTP GET request on %v: %v\n", url, err)
return
}
// 404 when not streaming
if resp.StatusCode == http.StatusNotFound {
return ErrRoomIsClosed
}
err = validateHttpStatus(resp)
if err != nil {
return
}
defer func() { _ = resp.Body.Close() }()
// guard the following copy loop
// if the context is cancelled, stop it by closing the reader
guardianCtx, cancelGuardian := context.WithCancel(ctx)
go func() {
<-guardianCtx.Done()
_ = resp.Body.Close()
}()
defer cancelGuardian()
// blocking copy
n, err := common.Copy(ctx, out, resp.Body)
if err != nil && !errors.Is(err, context.Canceled) {
// real error happens
b.error.Printf("Stream copying was interrupted unexpectedly: %v", err)
}
if err == nil {
b.info.Printf("The live is ended. (room %v)", roomId)
}
b.info.Printf("Bytes copied: %v", n)
return err
}
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