HTTP-FLV: Notify connection to expire when unpublishing. v6.0.152 v7.0.11

[winlinvip]

When stopping the stream, it will wait for the HTTP Streaming to exit. If the HTTP Streaming goroutine hangs, it will not exit automatically.

void SrsHttpStreamServer::http_unmount(SrsRequest* r)
{
    SrsUniquePtr<SrsLiveStream> stream(entry->stream);
    if (stream->entry) stream->entry->enabled = false;
    srs_usleep(...); // Wait for about 120s.
    mux.unhandle(entry->mount, stream.get()); // Free stream.
}

srs_error_t SrsLiveStream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r)
{
    err = do_serve_http(w, r); // If stuck in here for 120s+
    alive_viewers_--; // Crash at here, because stream has been deleted.

We should notify http stream connection to interrupt(expire):

void SrsHttpStreamServer::http_unmount(SrsRequest* r)
{
    SrsUniquePtr<SrsLiveStream> stream(entry->stream);
    if (stream->entry) stream->entry->enabled = false;
    stream->expire(); // Notify http stream to interrupt.

Note that we should notify all viewers pulling stream from this http stream.

Note that we have tried to fix this issue, but only try to wait for all viewers to quit, without interrupting the viewers, see https://github.com/ossrs/srs/pull/4144

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Co-authored-by: Jacob Su suzp1984@gmail.com