[downloader/http] Retry on more errors (#3065)

Closes #3056, #2071
Related: #3034, #2969
Authored-by: coletdjnz

yt_dlp/downloader/http.py

@@ -1,8 +1,7 @@
 from __future__ import unicode_literals
 
-import errno
 import os
-import socket
+import ssl
 import time
 import random
 
@@ -10,6 +9,7 @@
 from ..compat import (
     compat_str,
     compat_urllib_error,
+    compat_http_client
 )
 from ..utils import (
     ContentTooShortError,
@@ -23,6 +23,8 @@
     XAttrUnavailableError,
 )
 
+RESPONSE_READ_EXCEPTIONS = (TimeoutError, ConnectionError, ssl.SSLError, compat_http_client.HTTPException)
+
 
 class HttpFD(FileDownloader):
     def real_download(self, filename, info_dict):
@@ -124,15 +126,8 @@ def establish_connection():
             if has_range:
                 set_range(request, range_start, range_end)
             # Establish connection
-            try:
             try:
                 ctx.data = self.ydl.urlopen(request)
-                except (compat_urllib_error.URLError, ) as err:
-                    # reason may not be available, e.g. for urllib2.HTTPError on python 2.6
-                    reason = getattr(err, 'reason', None)
-                    if isinstance(reason, socket.timeout):
-                        raise RetryDownload(err)
-                    raise err
                 # When trying to resume, Content-Range HTTP header of response has to be checked
                 # to match the value of requested Range HTTP header. This is due to a webservers
                 # that don't support resuming and serve a whole file with no Content-Range
@@ -202,13 +197,14 @@ def establish_connection():
                     # Unexpected HTTP error
                     raise
                 raise RetryDownload(err)
-            except socket.timeout as err:
-                raise RetryDownload(err)
-            except socket.error as err:
-                if err.errno in (errno.ECONNRESET, errno.ETIMEDOUT):
-                    # Connection reset is no problem, just retry
-                    raise RetryDownload(err)
+            except compat_urllib_error.URLError as err:
+                if isinstance(err.reason, ssl.CertificateError):
                     raise
+                raise RetryDownload(err)
+            # In urllib.request.AbstractHTTPHandler, the response is partially read on request.
+            # Any errors that occur during this will not be wrapped by URLError
+            except RESPONSE_READ_EXCEPTIONS as err:
+                raise RetryDownload(err)
 
         def download():
             nonlocal throttle_start
@@ -254,16 +250,8 @@ def retry(e):
                 try:
                     # Download and write
                     data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
-                # socket.timeout is a subclass of socket.error but may not have
-                # errno set
-                except socket.timeout as e:
-                    retry(e)
-                except socket.error as e:
-                    # SSLError on python 2 (inherits socket.error) may have
-                    # no errno set but this error message
-                    if e.errno in (errno.ECONNRESET, errno.ETIMEDOUT) or getattr(e, 'message', None) == 'The read operation timed out':
-                        retry(e)
-                    raise
+                except RESPONSE_READ_EXCEPTIONS as err:
+                    retry(err)
 
                 byte_counter += len(data_block)