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There is a race condition where transfer has not been submitted yet while the request is cancelled which leads to the transfer state going back to `DOWNLOAD_REQUEST_STATE_OPEN` and the user of the request to get signalled about its completion (and the task actually happening after it was cancelled) leading to assertions and misbehaviours. To ensure that this race can't happen, we start differentiating between the UNSENT and CANCELLED states as in the normal case, when entering `submit_request` the state is UNSENT and at that point we need to know that it is not because the request has been cancelled. In practice this case lead to an assertion in `gst_adaptive_demux2_stream_begin_download_uri` because in a previous call to `gst_adaptive_demux2_stream_stop_default` we cancelled the previous request and setup a new one while it had not been submitted yet and then got a `on_download_complete` callback called from that previous cancelled request and then we tried to do `download_request_set_uri` on a request that was still `in_use`, leading to something like: ``` #0: 0x0000000186655ec8 g_assert (request->in_use == FALSE)assert.c:0 #1: 0x00000001127236b8 libgstadaptivedemux2.dylib`download_request_set_uri(request=0x000060000017cc00, uri="https://XXX/chunk-stream1-00002.webm", range_start=0, range_end=-1) at downloadrequest.c:361 #2: 0x000000011271cee8 libgstadaptivedemux2.dylib`gst_adaptive_demux2_stream_begin_download_uri(stream=0x00000001330f1800, uri="https://XXX/chunk-stream1-00002.webm", start=0, end=-1) at gstadaptivedemux-stream.c:1447 #3: 0x0000000112719898 libgstadaptivedemux2.dylib`gst_adaptive_demux2_stream_load_a_fragment [inlined] gst_adaptive_demux2_stream_download_fragment(stream=0x00000001330f1800) at gstadaptivedemux-stream.c:0 #4: 0x00000001127197f8 libgstadaptivedemux2.dylib`gst_adaptive_demux2_stream_load_a_fragment(stream=0x00000001330f1800) at gstadaptivedemux-stream.c:1969 #5: 0x000000011271c2a4 libgstadaptivedemux2.dylib`gst_adaptive_demux2_stream_next_download(stream=0x00000001330f1800) at gstadaptivedemux-stream.c:2112 ``` Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5435>
117 lines
4.8 KiB
C
117 lines
4.8 KiB
C
/* GStreamer
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* Copyright (C) 2011 Andoni Morales Alastruey <ylatuya@gmail.com>
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* Copyright (C) 2021-2022 Jan Schmidt <jan@centricular.com>
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*
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* downloadrequest.h:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __DOWNLOAD_REQUEST_H__
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#define __DOWNLOAD_REQUEST_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define DOWNLOAD_REQUEST(obj) ((DownloadRequest *)(obj))
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typedef struct _DownloadRequest DownloadRequest;
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typedef enum _DownloadRequestState DownloadRequestState;
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typedef void (*DownloadRequestEventCallback) (DownloadRequest *request, DownloadRequestState state, void *cb_data);
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enum _DownloadRequestState {
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DOWNLOAD_REQUEST_STATE_UNSENT,
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DOWNLOAD_REQUEST_STATE_OPEN, /* Request sent, but no response yet */
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DOWNLOAD_REQUEST_STATE_HEADERS_RECEIVED, /* Response headers received, awaiting body */
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DOWNLOAD_REQUEST_STATE_LOADING, /* Content loading in progress */
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DOWNLOAD_REQUEST_STATE_COMPLETE, /* Request processing finished successfully - check status_code for completion 200-399 codes */
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DOWNLOAD_REQUEST_STATE_ERROR, /* Request generated an http error - check status_code */
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DOWNLOAD_REQUEST_STATE_CANCELLED, /* Request has been cancelled by the user */
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};
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struct _DownloadRequest
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{
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gint ref_count;
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gboolean in_use; /* TRUE if this request is being serviced */
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gboolean send_progress; /* TRUE if this request wants progress events */
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DownloadRequestState state;
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guint status_code; /* HTTP status code */
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/* Request parameters */
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gchar * uri; /* URI of the request */
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gint64 range_start;
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gint64 range_end;
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/* possibly populated during a download */
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gchar * redirect_uri; /* Redirect target if any */
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gboolean redirect_permanent; /* If the redirect is permanent */
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GstStructure *headers; /* HTTP request/response headers */
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guint64 content_length; /* Response content length, if known (or 0) */
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guint64 content_received; /* Response content received so far */
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guint64 download_request_time; /* Epoch time when the download started */
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guint64 download_start_time; /* Epoch time when the first data for the download arrived */
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guint64 download_newest_data_time; /* Epoch time when the most recent data for the download arrived */
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guint64 download_end_time; /* Epoch time when the download finished */
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};
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void download_request_set_uri (DownloadRequest *request, const gchar *uri,
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gint64 range_start, gint64 range_end);
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/* Reset the request state back to UNSENT and clear any stored info. The request must not be in use */
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void download_request_reset (DownloadRequest *request);
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void download_request_begin_download (DownloadRequest *request);
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void download_request_set_caps (DownloadRequest * request, GstCaps * caps);
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GstCaps * download_request_get_caps (DownloadRequest * request);
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GstClockTime download_request_get_age (DownloadRequest *request);
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void download_request_add_buffer (DownloadRequest *request, GstBuffer *buffer);
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GstBuffer * download_request_take_buffer (DownloadRequest *request);
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GstBuffer * download_request_take_buffer_range (DownloadRequest *request, gint64 range_start, gint64 range_end);
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guint64 download_request_get_bytes_available (DownloadRequest *request);
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guint64 download_request_get_cur_offset (DownloadRequest *request);
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DownloadRequest * download_request_new (void);
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DownloadRequest * download_request_new_uri (const gchar * uri);
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DownloadRequest * download_request_new_uri_range (const gchar * uri, gint64 range_start, gint64 range_end);
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void download_request_set_callbacks (DownloadRequest *request,
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DownloadRequestEventCallback on_completion,
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DownloadRequestEventCallback on_error,
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DownloadRequestEventCallback on_cancellation,
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DownloadRequestEventCallback on_progress,
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void *cb_data);
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DownloadRequest *download_request_ref (DownloadRequest *request);
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void download_request_unref (DownloadRequest *request);
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void download_request_lock (DownloadRequest *request);
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void download_request_unlock (DownloadRequest *request);
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void download_request_despatch_progress (DownloadRequest *request);
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void download_request_despatch_completion (DownloadRequest *request);
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G_END_DECLS
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#endif /* __DOWNLOAD_REQUEST_H__ */
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