[downloader/aria2c] Native progress for aria2c via RPC (#3724)

Authored by: Lesmiscore, pukkandan

Closes #2038

README.md

@@ -153,6 +153,7 @@ Some of yt-dlp's default options are different from that of youtube-dl and youtu
 * When `--embed-subs` and `--write-subs` are used together, the subtitles are written to disk and also embedded in the media file. You can use just `--embed-subs` to embed the subs and automatically delete the separate file. See [#630 (comment)](https://github.com/yt-dlp/yt-dlp/issues/630#issuecomment-893659460) for more info. `--compat-options no-keep-subs` can be used to revert this
 * `certifi` will be used for SSL root certificates, if installed. If you want to use system certificates (e.g. self-signed), use `--compat-options no-certifi`
 * yt-dlp's sanitization of invalid characters in filenames is different/smarter than in youtube-dl. You can use `--compat-options filename-sanitization` to revert to youtube-dl's behavior
+* yt-dlp tries to parse the external downloader outputs into the standard progress output if possible (Currently implemented: `aria2c`). You can use `--compat-options no-external-downloader-progress` to get the downloader output as-is
 
 For ease of use, a few more compat options are available:
 
@@ -160,7 +161,7 @@ For ease of use, a few more compat options are available:
 * `--compat-options youtube-dl`: Same as `--compat-options all,-multistreams`
 * `--compat-options youtube-dlc`: Same as `--compat-options all,-no-live-chat,-no-youtube-channel-redirect`
 * `--compat-options 2021`: Same as `--compat-options 2022,no-certifi,filename-sanitization,no-youtube-prefer-utc-upload-date`
-* `--compat-options 2022`: Currently does nothing. Use this to enable all future compat options
+* `--compat-options 2022`: Same as `--compat-options no-external-downloader-progress`. Use this to enable all future compat options
 
 
 # INSTALLATION

yt_dlp/downloader/external.py

@@ -1,9 +1,11 @@
 import enum
+import json
 import os.path
 import re
 import subprocess
 import sys
 import time
+import uuid
 
 from .fragment import FragmentFD
 from ..compat import functools
@@ -20,8 +22,10 @@ from ..utils import (
     determine_ext,
     encodeArgument,
     encodeFilename,
+    find_available_port,
     handle_youtubedl_headers,
     remove_end,
+    sanitized_Request,
     traverse_obj,
 )
 
@@ -60,7 +64,6 @@ class ExternalFD(FragmentFD):
             }
             if filename != '-':
                 fsize = os.path.getsize(encodeFilename(tmpfilename))
-                self.to_screen(f'\r[{self.get_basename()}] Downloaded {fsize} bytes')
                 self.try_rename(tmpfilename, filename)
                 status.update({
                     'downloaded_bytes': fsize,
@@ -129,8 +132,7 @@ class ExternalFD(FragmentFD):
         self._debug_cmd(cmd)
 
         if 'fragments' not in info_dict:
-            _, stderr, returncode = Popen.run(
+            _, stderr, returncode = self._call_process(cmd, info_dict)
-                cmd, text=True, stderr=subprocess.PIPE if self._CAPTURE_STDERR else None)
             if returncode and stderr:
                 self.to_stderr(stderr)
             return returncode
@@ -140,7 +142,7 @@ class ExternalFD(FragmentFD):
         retry_manager = RetryManager(self.params.get('fragment_retries'), self.report_retry,
                                      frag_index=None, fatal=not skip_unavailable_fragments)
         for retry in retry_manager:
-            _, stderr, returncode = Popen.run(cmd, text=True, stderr=subprocess.PIPE)
+            _, stderr, returncode = self._call_process(cmd, info_dict)
             if not returncode:
                 break
             # TODO: Decide whether to retry based on error code
@@ -172,6 +174,9 @@ class ExternalFD(FragmentFD):
         self.try_remove(encodeFilename('%s.frag.urls' % tmpfilename))
         return 0
 
+    def _call_process(self, cmd, info_dict):
+        return Popen.run(cmd, text=True, stderr=subprocess.PIPE)
+
 
 class CurlFD(ExternalFD):
     AVAILABLE_OPT = '-V'
@@ -256,6 +261,14 @@ class Aria2cFD(ExternalFD):
     def _aria2c_filename(fn):
         return fn if os.path.isabs(fn) else f'.{os.path.sep}{fn}'
 
+    def _call_downloader(self, tmpfilename, info_dict):
+        if 'no-external-downloader-progress' not in self.params.get('compat_opts', []):
+            info_dict['__rpc'] = {
+                'port': find_available_port() or 19190,
+                'secret': str(uuid.uuid4()),
+            }
+        return super()._call_downloader(tmpfilename, info_dict)
+
     def _make_cmd(self, tmpfilename, info_dict):
         cmd = [self.exe, '-c',
                '--console-log-level=warn', '--summary-interval=0', '--download-result=hide',
@@ -276,6 +289,12 @@ class Aria2cFD(ExternalFD):
         cmd += self._bool_option('--show-console-readout', 'noprogress', 'false', 'true', '=')
         cmd += self._configuration_args()
 
+        if '__rpc' in info_dict:
+            cmd += [
+                '--enable-rpc',
+                f'--rpc-listen-port={info_dict["__rpc"]["port"]}',
+                f'--rpc-secret={info_dict["__rpc"]["secret"]}']
+
         # aria2c strips out spaces from the beginning/end of filenames and paths.
         # We work around this issue by adding a "./" to the beginning of the
         # filename and relative path, and adding a "/" at the end of the path.
@@ -304,6 +323,88 @@ class Aria2cFD(ExternalFD):
             cmd += ['--', info_dict['url']]
         return cmd
 
+    def aria2c_rpc(self, rpc_port, rpc_secret, method, params=()):
+        # Does not actually need to be UUID, just unique
+        sanitycheck = str(uuid.uuid4())
+        d = json.dumps({
+            'jsonrpc': '2.0',
+            'id': sanitycheck,
+            'method': method,
+            'params': [f'token:{rpc_secret}', *params],
+        }).encode('utf-8')
+        request = sanitized_Request(
+            f'http://localhost:{rpc_port}/jsonrpc',
+            data=d, headers={
+                'Content-Type': 'application/json',
+                'Content-Length': f'{len(d)}',
+                'Ytdl-request-proxy': '__noproxy__',
+            })
+        with self.ydl.urlopen(request) as r:
+            resp = json.load(r)
+        assert resp.get('id') == sanitycheck, 'Something went wrong with RPC server'
+        return resp['result']
+
+    def _call_process(self, cmd, info_dict):
+        if '__rpc' not in info_dict:
+            return super()._call_process(cmd, info_dict)
+
+        send_rpc = functools.partial(self.aria2c_rpc, info_dict['__rpc']['port'], info_dict['__rpc']['secret'])
+        started = time.time()
+
+        fragmented = 'fragments' in info_dict
+        frag_count = len(info_dict['fragments']) if fragmented else 1
+        status = {
+            'filename': info_dict.get('_filename'),
+            'status': 'downloading',
+            'elapsed': 0,
+            'downloaded_bytes': 0,
+            'fragment_count': frag_count if fragmented else None,
+            'fragment_index': 0 if fragmented else None,
+        }
+        self._hook_progress(status, info_dict)
+
+        def get_stat(key, *obj, average=False):
+            val = tuple(filter(None, map(float, traverse_obj(obj, (..., ..., key))))) or [0]
+            return sum(val) / (len(val) if average else 1)
+
+        with Popen(cmd, text=True, stdout=subprocess.DEVNULL, stderr=subprocess.PIPE) as p:
+            # Add a small sleep so that RPC client can receive response,
+            # or the connection stalls infinitely
+            time.sleep(0.2)
+            retval = p.poll()
+            while retval is None:
+                # We don't use tellStatus as we won't know the GID without reading stdout
+                # Ref: https://aria2.github.io/manual/en/html/aria2c.html#aria2.tellActive
+                active = send_rpc('aria2.tellActive')
+                completed = send_rpc('aria2.tellStopped', [0, frag_count])
+
+                downloaded = get_stat('totalLength', completed) + get_stat('completedLength', active)
+                speed = get_stat('downloadSpeed', active)
+                total = frag_count * get_stat('totalLength', active, completed, average=True)
+                if total < downloaded:
+                    total = None
+
+                status.update({
+                    'downloaded_bytes': int(downloaded),
+                    'speed': speed,
+                    'total_bytes': None if fragmented else total,
+                    'total_bytes_estimate': total,
+                    'eta': (total - downloaded) / (speed or 1),
+                    'fragment_index': min(frag_count, len(completed) + 1) if fragmented else None,
+                    'elapsed': time.time() - started
+                })
+                self._hook_progress(status, info_dict)
+
+                if not active and len(completed) >= frag_count:
+                    send_rpc('aria2.shutdown')
+                    retval = p.wait()
+                    break
+
+                time.sleep(0.1)
+                retval = p.poll()
+
+            return '', p.stderr.read(), retval
+
 
 class HttpieFD(ExternalFD):
     AVAILABLE_OPT = '--version'

yt_dlp/options.py

@@ -464,14 +464,14 @@ def create_parser():
             'allowed_values': {
                 'filename', 'filename-sanitization', 'format-sort', 'abort-on-error', 'format-spec', 'no-playlist-metafiles',
                 'multistreams', 'no-live-chat', 'playlist-index', 'list-formats', 'no-direct-merge',
-                'no-attach-info-json', 'embed-metadata', 'embed-thumbnail-atomicparsley',
+                'no-attach-info-json', 'embed-thumbnail-atomicparsley', 'no-external-downloader-progress',
-                'seperate-video-versions', 'no-clean-infojson', 'no-keep-subs', 'no-certifi',
+                'embed-metadata', 'seperate-video-versions', 'no-clean-infojson', 'no-keep-subs', 'no-certifi',
                 'no-youtube-channel-redirect', 'no-youtube-unavailable-videos', 'no-youtube-prefer-utc-upload-date',
             }, 'aliases': {
                 'youtube-dl': ['all', '-multistreams'],
                 'youtube-dlc': ['all', '-no-youtube-channel-redirect', '-no-live-chat'],
                 '2021': ['2022', 'no-certifi', 'filename-sanitization', 'no-youtube-prefer-utc-upload-date'],
-                '2022': [],
+                '2022': ['no-external-downloader-progress'],
             }
         }, help=(
             'Options that can help keep compatibility with youtube-dl or youtube-dlc '

yt_dlp/utils.py

@@ -5243,6 +5243,15 @@ def random_birthday(year_field, month_field, day_field):
     }
 
 
+def find_available_port(interface=''):
+    try:
+        with socket.socket() as sock:
+            sock.bind((interface, 0))
+            return sock.getsockname()[1]
+    except OSError:
+        return None
+
+
 # Templates for internet shortcut files, which are plain text files.
 DOT_URL_LINK_TEMPLATE = '''\
 [InternetShortcut]