Bump minimum version bound on Twisted to 21.2.0. (#18727)

Distro packagers have been consulted and as far as has been answered so
far, the lowest version of Twisted on the distros' platforms is 22.1, so
this bump should be safe.

This gives us 2 notable things:

- contextvar propagation support, which would let us remove A LOT of
logcontext machinery
  and vastly simplify logcontext rules!
- The test helpers have moved to the new location, so no longer will you
import test helpers
from the 'correct' (non-deprecated) path and get told by CI (olddeps)
that your test
  doesn't exist.

Changelog entries for those are reproduced below:

> - twisted.internet.defer.inlineCallbacks and ensureDeferred will now
associate a contextvars.Context with the coroutines they run, meaning
that ContextVar objects will maintain their value within the same
coroutine, similarly to asyncio Tasks. This functionality requires
Python 3.7+, or the contextvars PyPI backport to be installed for Python
3.5-3.6. (#<!--- -->9719, #<!--- -->9826)
>
> - twisted.test.proto_helpers has moved to twisted.internet.testing.
twisted.test.proto_helpers has been deprecated. (#<!--- -->6435)

---------

Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>

changelog.d/18727.misc

@@ -0,0 +1 @@
+Bump minimum version bound on Twisted to 21.2.0.

poetry.lock

@@ -39,7 +39,7 @@ description = "The ultimate Python library in building OAuth and OpenID Connect
 optional = true
 python-versions = ">=3.9"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"jwt\" or extra == \"oidc\""
+markers = "extra == \"oidc\" or extra == \"jwt\" or extra == \"all\""
 files = [
     {file = "authlib-1.6.1-py2.py3-none-any.whl", hash = "sha256:e9d2031c34c6309373ab845afc24168fe9e93dc52d252631f52642f21f5ed06e"},
     {file = "authlib-1.6.1.tar.gz", hash = "sha256:4dffdbb1460ba6ec8c17981a4c67af7d8af131231b5a36a88a1e8c80c111cdfd"},
@@ -435,7 +435,7 @@ description = "XML bomb protection for Python stdlib modules"
 optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "defusedxml-0.7.1-py2.py3-none-any.whl", hash = "sha256:a352e7e428770286cc899e2542b6cdaedb2b4953ff269a210103ec58f6198a61"},
     {file = "defusedxml-0.7.1.tar.gz", hash = "sha256:1bb3032db185915b62d7c6209c5a8792be6a32ab2fedacc84e01b52c51aa3e69"},
@@ -478,7 +478,7 @@ description = "XPath 1.0/2.0/3.0/3.1 parsers and selectors for ElementTree and l
 optional = true
 python-versions = ">=3.7"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "elementpath-4.1.5-py3-none-any.whl", hash = "sha256:2ac1a2fb31eb22bbbf817f8cf6752f844513216263f0e3892c8e79782fe4bb55"},
     {file = "elementpath-4.1.5.tar.gz", hash = "sha256:c2d6dc524b29ef751ecfc416b0627668119d8812441c555d7471da41d4bacb8d"},
@@ -528,7 +528,7 @@ description = "Python wrapper for hiredis"
 optional = true
 python-versions = ">=3.8"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"redis\""
+markers = "extra == \"redis\" or extra == \"all\""
 files = [
     {file = "hiredis-3.2.1-cp310-cp310-macosx_10_15_universal2.whl", hash = "sha256:add17efcbae46c5a6a13b244ff0b4a8fa079602ceb62290095c941b42e9d5dec"},
     {file = "hiredis-3.2.1-cp310-cp310-macosx_10_15_x86_64.whl", hash = "sha256:5fe955cc4f66c57df1ae8e5caf4de2925d43b5efab4e40859662311d1bcc5f54"},
@@ -865,7 +865,7 @@ description = "Jaeger Python OpenTracing Tracer implementation"
 optional = true
 python-versions = ">=3.7"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"opentracing\""
+markers = "extra == \"opentracing\" or extra == \"all\""
 files = [
     {file = "jaeger-client-4.8.0.tar.gz", hash = "sha256:3157836edab8e2c209bd2d6ae61113db36f7ee399e66b1dcbb715d87ab49bfe0"},
 ]
@@ -1003,7 +1003,7 @@ description = "A strictly RFC 4510 conforming LDAP V3 pure Python client library
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"matrix-synapse-ldap3\""
+markers = "extra == \"matrix-synapse-ldap3\" or extra == \"all\""
 files = [
     {file = "ldap3-2.9.1-py2.py3-none-any.whl", hash = "sha256:5869596fc4948797020d3f03b7939da938778a0f9e2009f7a072ccf92b8e8d70"},
     {file = "ldap3-2.9.1.tar.gz", hash = "sha256:f3e7fc4718e3f09dda568b57100095e0ce58633bcabbed8667ce3f8fbaa4229f"},
@@ -1019,7 +1019,7 @@ description = "Powerful and Pythonic XML processing library combining libxml2/li
 optional = true
 python-versions = ">=3.8"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"url-preview\""
+markers = "extra == \"url-preview\" or extra == \"all\""
 files = [
     {file = "lxml-6.0.0-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:35bc626eec405f745199200ccb5c6b36f202675d204aa29bb52e27ba2b71dea8"},
     {file = "lxml-6.0.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:246b40f8a4aec341cbbf52617cad8ab7c888d944bfe12a6abd2b1f6cfb6f6082"},
@@ -1260,7 +1260,7 @@ description = "An LDAP3 auth provider for Synapse"
 optional = true
 python-versions = ">=3.7"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"matrix-synapse-ldap3\""
+markers = "extra == \"matrix-synapse-ldap3\" or extra == \"all\""
 files = [
     {file = "matrix-synapse-ldap3-0.3.0.tar.gz", hash = "sha256:8bb6517173164d4b9cc44f49de411d8cebdb2e705d5dd1ea1f38733c4a009e1d"},
     {file = "matrix_synapse_ldap3-0.3.0-py3-none-any.whl", hash = "sha256:8b4d701f8702551e98cc1d8c20dbed532de5613584c08d0df22de376ba99159d"},
@@ -1493,7 +1493,7 @@ description = "OpenTracing API for Python. See documentation at http://opentraci
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"opentracing\""
+markers = "extra == \"opentracing\" or extra == \"all\""
 files = [
     {file = "opentracing-2.4.0.tar.gz", hash = "sha256:a173117e6ef580d55874734d1fa7ecb6f3655160b8b8974a2a1e98e5ec9c840d"},
 ]
@@ -1699,7 +1699,7 @@ description = "psycopg2 - Python-PostgreSQL Database Adapter"
 optional = true
 python-versions = ">=3.8"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"postgres\""
+markers = "extra == \"postgres\" or extra == \"all\""
 files = [
     {file = "psycopg2-2.9.10-cp310-cp310-win32.whl", hash = "sha256:5df2b672140f95adb453af93a7d669d7a7bf0a56bcd26f1502329166f4a61716"},
     {file = "psycopg2-2.9.10-cp310-cp310-win_amd64.whl", hash = "sha256:c6f7b8561225f9e711a9c47087388a97fdc948211c10a4bccbf0ba68ab7b3b5a"},
@@ -1720,7 +1720,7 @@ description = ".. image:: https://travis-ci.org/chtd/psycopg2cffi.svg?branch=mas
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "platform_python_implementation == \"PyPy\" and (extra == \"all\" or extra == \"postgres\")"
+markers = "platform_python_implementation == \"PyPy\" and (extra == \"postgres\" or extra == \"all\")"
 files = [
     {file = "psycopg2cffi-2.9.0.tar.gz", hash = "sha256:7e272edcd837de3a1d12b62185eb85c45a19feda9e62fa1b120c54f9e8d35c52"},
 ]
@@ -1736,7 +1736,7 @@ description = "A Simple library to enable psycopg2 compatability"
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "platform_python_implementation == \"PyPy\" and (extra == \"all\" or extra == \"postgres\")"
+markers = "platform_python_implementation == \"PyPy\" and (extra == \"postgres\" or extra == \"all\")"
 files = [
     {file = "psycopg2cffi-compat-1.1.tar.gz", hash = "sha256:d25e921748475522b33d13420aad5c2831c743227dc1f1f2585e0fdb5c914e05"},
 ]
@@ -1996,7 +1996,7 @@ description = "A development tool to measure, monitor and analyze the memory beh
 optional = true
 python-versions = ">=3.6"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"cache-memory\""
+markers = "extra == \"cache-memory\" or extra == \"all\""
 files = [
     {file = "Pympler-1.0.1-py3-none-any.whl", hash = "sha256:d260dda9ae781e1eab6ea15bacb84015849833ba5555f141d2d9b7b7473b307d"},
     {file = "Pympler-1.0.1.tar.gz", hash = "sha256:993f1a3599ca3f4fcd7160c7545ad06310c9e12f70174ae7ae8d4e25f6c5d3fa"},
@@ -2056,7 +2056,7 @@ description = "Python implementation of SAML Version 2 Standard"
 optional = true
 python-versions = ">=3.9,<4.0"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "pysaml2-7.5.0-py3-none-any.whl", hash = "sha256:bc6627cc344476a83c757f440a73fda1369f13b6fda1b4e16bca63ffbabb5318"},
     {file = "pysaml2-7.5.0.tar.gz", hash = "sha256:f36871d4e5ee857c6b85532e942550d2cf90ea4ee943d75eb681044bbc4f54f7"},
@@ -2081,7 +2081,7 @@ description = "Extensions to the standard Python datetime module"
 optional = true
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},
@@ -2109,7 +2109,7 @@ description = "World timezone definitions, modern and historical"
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "pytz-2022.7.1-py2.py3-none-any.whl", hash = "sha256:78f4f37d8198e0627c5f1143240bb0206b8691d8d7ac6d78fee88b78733f8c4a"},
     {file = "pytz-2022.7.1.tar.gz", hash = "sha256:01a0681c4b9684a28304615eba55d1ab31ae00bf68ec157ec3708a8182dbbcd0"},
@@ -2474,7 +2474,7 @@ description = "Python client for Sentry (https://sentry.io)"
 optional = true
 python-versions = ">=3.6"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"sentry\""
+markers = "extra == \"sentry\" or extra == \"all\""
 files = [
     {file = "sentry_sdk-2.32.0-py2.py3-none-any.whl", hash = "sha256:6cf51521b099562d7ce3606da928c473643abe99b00ce4cb5626ea735f4ec345"},
     {file = "sentry_sdk-2.32.0.tar.gz", hash = "sha256:9016c75d9316b0f6921ac14c8cd4fb938f26002430ac5be9945ab280f78bec6b"},
@@ -2662,7 +2662,7 @@ description = "Tornado IOLoop Backed Concurrent Futures"
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"opentracing\""
+markers = "extra == \"opentracing\" or extra == \"all\""
 files = [
     {file = "threadloop-1.0.2-py2-none-any.whl", hash = "sha256:5c90dbefab6ffbdba26afb4829d2a9df8275d13ac7dc58dccb0e279992679599"},
     {file = "threadloop-1.0.2.tar.gz", hash = "sha256:8b180aac31013de13c2ad5c834819771992d350267bddb854613ae77ef571944"},
@@ -2678,7 +2678,7 @@ description = "Python bindings for the Apache Thrift RPC system"
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"opentracing\""
+markers = "extra == \"opentracing\" or extra == \"all\""
 files = [
     {file = "thrift-0.16.0.tar.gz", hash = "sha256:2b5b6488fcded21f9d312aa23c9ff6a0195d0f6ae26ddbd5ad9e3e25dfc14408"},
 ]
@@ -2740,7 +2740,7 @@ description = "Tornado is a Python web framework and asynchronous networking lib
 optional = true
 python-versions = ">=3.9"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"opentracing\""
+markers = "extra == \"opentracing\" or extra == \"all\""
 files = [
     {file = "tornado-6.5-cp39-abi3-macosx_10_9_universal2.whl", hash = "sha256:f81067dad2e4443b015368b24e802d0083fecada4f0a4572fdb72fc06e54a9a6"},
     {file = "tornado-6.5-cp39-abi3-macosx_10_9_x86_64.whl", hash = "sha256:9ac1cbe1db860b3cbb251e795c701c41d343f06a96049d6274e7c77559117e41"},
@@ -2877,7 +2877,7 @@ description = "non-blocking redis client for python"
 optional = true
 python-versions = "*"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"redis\""
+markers = "extra == \"redis\" or extra == \"all\""
 files = [
     {file = "txredisapi-1.4.11-py3-none-any.whl", hash = "sha256:ac64d7a9342b58edca13ef267d4fa7637c1aa63f8595e066801c1e8b56b22d0b"},
     {file = "txredisapi-1.4.11.tar.gz", hash = "sha256:3eb1af99aefdefb59eb877b1dd08861efad60915e30ad5bf3d5bf6c5cedcdbc6"},
@@ -3208,7 +3208,7 @@ description = "An XML Schema validator and decoder"
 optional = true
 python-versions = ">=3.7"
 groups = ["main"]
-markers = "extra == \"all\" or extra == \"saml2\""
+markers = "extra == \"saml2\" or extra == \"all\""
 files = [
     {file = "xmlschema-2.4.0-py3-none-any.whl", hash = "sha256:dc87be0caaa61f42649899189aab2fd8e0d567f2cf548433ba7b79278d231a4a"},
     {file = "xmlschema-2.4.0.tar.gz", hash = "sha256:d74cd0c10866ac609e1ef94a5a69b018ad16e39077bc6393408b40c6babee793"},
@@ -3352,4 +3352,4 @@ url-preview = ["lxml"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9.0"
-content-hash = "b1a0f4708465fd597d0bc7ebb09443ce0e2613cd58a33387a28036249f26856b"
+content-hash = "d2560fb09c99bf87690749ad902753cfa3f3063bd14cd9d0c0f37ca9e89a7757"

pyproject.toml

@@ -178,8 +178,13 @@ signedjson = "^1.1.0"
 service-identity = ">=18.1.0"
 # Twisted 18.9 introduces some logger improvements that the structured
 # logger utilises
-Twisted = {extras = ["tls"], version = ">=18.9.0"}
+# Twisted 19.7.0 moves test helpers to a new module and deprecates the old location.
-treq = ">=15.1"
+# Twisted 21.2.0 introduces contextvar support.
+# We could likely bump this to 22.1 without making distro packagers'
+# lives hard (as of 2025-07, distro support is Ubuntu LTS: 22.1, Debian stable: 22.4,
+# RHEL 9: 22.10)
+Twisted = {extras = ["tls"], version = ">=21.2.0"}
+treq = ">=21.5.0"
 # Twisted has required pyopenssl 16.0 since about Twisted 16.6.
 pyOpenSSL = ">=16.0.0"
 PyYAML = ">=5.3"