Update third_party/protobuf to 3.21.4 (grpc#30377)

* Update third_party/protobuf

* run tools/distrib/python/make_grpcio_tools.py

* regenerate protos for ruby, php

* update build_handwritten.yaml

* regenerate projects

* Build - Use :well_known_type_protos instead of :well_known_protos

* Fix target

* Update upb

* Update Python for Protobuf 4.21 (grpc#140)

* Update protobuf dependency on grpcio-tools

* Off by one

* Drop python 3.6 support

* Try upgrading pip

* And in the other script

* Try to figure out if we're compatible with abi3

* See what we've already got installed

* Update the requirements.txt file I didn't know existed

* And here too

* See what's installed

* Let's try that again

* Remove

* Try to confirm version

* Let me see the generated code

* Fix non-Bazel test runner

* Work for all test directories

* Regenerate example protos

* Clean up

* Generate .pyi files

* Fix type checking and linting

* Exclude pyi files from isort

* Upgrade to 3.21.4

* Update iwyu to get around messy protobuf IWYU rules

Co-authored-by: Richard Belleville <[email protected]>

.pylintrc-examples

@@ -102,5 +102,7 @@ disable=
 	wrong-import-order,
 	# TODO(https://github.com/PyCQA/pylint/issues/3882): Upgrade Pylint
 	unsubscriptable-object,
+	# NOTE(rbellevi): Pylint doesn't understand .pyi files.
+	no-member,
   # NOTE(sergiitk): yapf compatibility, ref #25071
   bad-continuation,

bazel/generate_cc.bzl

@@ -143,7 +143,7 @@ def generate_cc_impl(ctx):
         f = ctx.attr.well_known_protos.files.to_list()[0].dirname
         if f != "external/com_google_protobuf/src/google/protobuf":
             print(
-                "Error: Only @com_google_protobuf//:well_known_protos is supported",
+                "Error: Only @com_google_protobuf//:well_known_type_protos is supported",
             )  # buildifier: disable=print
         else:
             # f points to "external/com_google_protobuf/src/google/protobuf"
@@ -200,7 +200,7 @@ _generate_cc = rule(
 def generate_cc(well_known_protos, **kwargs):
     if well_known_protos:
         _generate_cc(
-            well_known_protos = "@com_google_protobuf//:well_known_protos",
+            well_known_protos = "@com_google_protobuf//:well_known_type_protos",
             **kwargs
         )
     else:

bazel/generate_objc.bzl

@@ -177,7 +177,7 @@ generate_objc = rule(
             default = False,
         ),
         "well_known_protos": attr.label(
-            default = "@com_google_protobuf//:well_known_protos",
+            default = "@com_google_protobuf//:well_known_type_protos",
         ),
         "_protoc": attr.label(
             default = Label("//external:protocol_compiler"),

bazel/grpc_deps.bzl

@@ -208,11 +208,11 @@ def grpc_deps():
     if "com_google_protobuf" not in native.existing_rules():
         http_archive(
             name = "com_google_protobuf",
-            sha256 = "bab1685f92cc4ea5b6420026eef6c7973ae96fc21f4f1a3ee626dc6ca6d77c12",
-            strip_prefix = "protobuf-22d0e265de7d2b3d2e9a00d071313502e7d4cccf",
+            sha256 = "fc4e76d540ade9a3a45cc6baf6d7c60eae2a414e2a454529b97b5364b9141ea9",
+            strip_prefix = "protobuf-c9869dc7803eb0a21d7e589c40ff4f9288cd34ae",
             urls = [
-                "https://storage.googleapis.com/grpc-bazel-mirror/github.com/protocolbuffers/protobuf/archive/22d0e265de7d2b3d2e9a00d071313502e7d4cccf.tar.gz",
-                "https://github.com/protocolbuffers/protobuf/archive/22d0e265de7d2b3d2e9a00d071313502e7d4cccf.tar.gz",
+                "https://storage.googleapis.com/grpc-bazel-mirror/github.com/protocolbuffers/protobuf/archive/c9869dc7803eb0a21d7e589c40ff4f9288cd34ae.tar.gz",
+                "https://github.com/protocolbuffers/protobuf/archive/c9869dc7803eb0a21d7e589c40ff4f9288cd34ae.tar.gz",
             ],
             patches = ["@com_github_grpc_grpc//third_party:protobuf.patch"],
             patch_args = ["-p1"],

build_handwritten.yaml

@@ -15,7 +15,7 @@ settings:
   core_version: 26.0.0
   csharp_major_version: 2
   g_stands_for: gamma
-  protobuf_version: 3.19.4
+  protobuf_version: 3.21.4
   version: 1.49.0-dev
 targets:
 - name: gen_hpack_tables