Sync contrib/tools/python3 layout with upstream

* Move src/ subdir contents to the top of the layout
* Rename self-written lib -> lib2 to avoid CaseFolding warning from the VCS
* Regenerate contrib/libs/python proxy-headers accordingly
4ccc62ac1511abcf0fed14ccade38e984e088f1e

1 files changed, 41 insertions, 0 deletions

diff --git a/contrib/tools/python3/Lib/asyncio/constants.py b/contrib/tools/python3/Lib/asyncio/constants.py
new file mode 100644
index 0000000000..b60c1e4236
--- /dev/null
+++ b/contrib/tools/python3/Lib/asyncio/constants.py
@@ -0,0 +1,41 @@
+# Contains code from https://github.com/MagicStack/uvloop/tree/v0.16.0
+# SPDX-License-Identifier: PSF-2.0 AND (MIT OR Apache-2.0)
+# SPDX-FileCopyrightText: Copyright (c) 2015-2021 MagicStack Inc.  http://magic.io
+
+import enum
+
+# After the connection is lost, log warnings after this many write()s.
+LOG_THRESHOLD_FOR_CONNLOST_WRITES = 5
+
+# Seconds to wait before retrying accept().
+ACCEPT_RETRY_DELAY = 1
+
+# Number of stack entries to capture in debug mode.
+# The larger the number, the slower the operation in debug mode
+# (see extract_stack() in format_helpers.py).
+DEBUG_STACK_DEPTH = 10
+
+# Number of seconds to wait for SSL handshake to complete
+# The default timeout matches that of Nginx.
+SSL_HANDSHAKE_TIMEOUT = 60.0
+
+# Number of seconds to wait for SSL shutdown to complete
+# The default timeout mimics lingering_time
+SSL_SHUTDOWN_TIMEOUT = 30.0
+
+# Used in sendfile fallback code.  We use fallback for platforms
+# that don't support sendfile, or for TLS connections.
+SENDFILE_FALLBACK_READBUFFER_SIZE = 1024 * 256
+
+FLOW_CONTROL_HIGH_WATER_SSL_READ = 256  # KiB
+FLOW_CONTROL_HIGH_WATER_SSL_WRITE = 512  # KiB
+
+# Default timeout for joining the threads in the threadpool
+THREAD_JOIN_TIMEOUT = 300
+
+# The enum should be here to break circular dependencies between
+# base_events and sslproto
+class _SendfileMode(enum.Enum):
+    UNSUPPORTED = enum.auto()
+    TRY_NATIVE = enum.auto()
+    FALLBACK = enum.auto()