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package bilibili
import (
"context"
"errors"
"fmt"
"github.com/keuin/slbr/common"
"io"
"net/http"
"os"
"strings"
)
const kInitReadBytes = 4096 // 4KiB
// 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,
fileCreator func() (*os.File, error),
bufSize int64,
) (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.logger.Error("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.logger.Error("Cannot make HTTP GET request on %v: %v\n", url, err)
return
}
// 404 when not streaming
if resp.StatusCode == http.StatusNotFound {
return fmt.Errorf("live is not started or the room does not exist")
}
err = validateHttpStatus(resp)
if err != nil {
return
}
defer func() { _ = resp.Body.Close() }()
b.logger.Info("Waiting for stream initial bytes...")
// read some first bytes to ensure that the live is really started,
// so we don't create blank files if the live room is open
// but the live hasn't started yet
initBytes := make([]byte, kInitReadBytes)
_, err = io.ReadFull(resp.Body, initBytes)
if err != nil {
b.logger.Error("Failed to read stream initial bytes: %v", err)
return
}
b.logger.Info("Stream is started. Receiving live stream...")
// write initial bytes
var out *os.File
out, err = fileCreator()
if err != nil {
b.logger.Error("Cannot open file for writing: %v", err)
err = common.NewUnrecoverableTaskError("failed to create file", err)
return
}
_, err = out.Write(initBytes)
if err != nil {
b.logger.Error("Failed to write to file: %v", err)
return
}
initBytes = nil // discard that buffer
var n int64
// blocking copy
copyLoop:
for err == nil {
select {
case <-ctx.Done():
// cancelled
err = ctx.Err()
break copyLoop
default:
var sz int64
sz, err = io.CopyN(out, resp.Body, bufSize)
n += sz
}
}
if errors.Is(err, context.Canceled) {
b.logger.Info("Stop copying...")
} else if errors.Is(err, io.EOF) {
b.logger.Info("The live is ended. (room %v)", roomId)
} else {
b.logger.Error("Stream copying was interrupted unexpectedly: %v", err)
}
b.logger.Info("Total downloaded: %v", common.PrettyBytes(uint64(n)))
return err
}
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