Update local_container_links to use python==3.13 and flask

examples/local_arg_printer/.bazelversion

@@ -0,0 +1 @@
+8.2.1

examples/local_arg_printer/MODULE.bazel

@@ -0,0 +1,6 @@
+module(
+    name = "xmanager_local_arg_printer_example",
+    version = "1.0",
+)
+
+bazel_dep(name = "rules_cc", version = "0.1.2")

examples/local_arg_printer/arg_printer.cc

@@ -12,6 +12,22 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// A simple C++ binary that prints its command-line arguments to a file.
+//
+// The output file path is read from the `OUTPUT_PATH` environment variable.
+// The first line of the output file will contain the argument count, followed
+// by each argument on a new line. The program then sleeps for 5 seconds to
+// simulate a long-running job before exiting.
+// Usage:
+// ```
+// $ OUTPUT_PATH="/tmp/output.txt" bazel run //:arg_printer -- "arg1" "arg2"
+// $ cat /tmp/output.txt
+// 3
+// /home/user/.cache/bazel/_bazel_user/b2b20ce9d34fd5389bf343c4cc37f48f/execroot/_main/bazel-out/k8-fastbuild/bin/arg_printer
+// arg1
+// arg2
+// ```
+
 #include <chrono>
 #include <fstream>
 #include <iostream>

examples/local_arg_printer/launcher.py

@@ -14,7 +14,7 @@
 """XManager launcher that runs locally a binary built with Bazel.
 
 One must `cd` into xmanager/examples/local_arg_printer/ in order to run this
-example because Bazel needs to locate the WORKSPACE file.
+example because Bazel needs to locate the `MODULE.bazel` file.
 """
 
 from typing import Sequence

examples/local_container_links/.bazelversion

@@ -0,0 +1 @@
+8.2.1

examples/local_container_links/BUILD.bazel

@@ -1,36 +1,39 @@
-# Copyright 2021 DeepMind Technologies Limited
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-load("@io_bazel_rules_docker//container:container.bzl", "container_image")
-load("@python_deps//:requirements.bzl", "requirement")
-load("@subpar//:subpar.bzl", "par_binary")
+load("@aspect_rules_py//py:defs.bzl", "py_image_layer")
+load("@rules_python//python:defs.bzl", "py_binary")
+load("@rules_oci//oci:defs.bzl", "oci_image", "oci_load")
+load("@rules_pkg//:pkg.bzl", "pkg_tar")
 
 licenses(["notice"])
 
-par_binary(
+py_binary(
     name = "server",
     srcs = ["server.py"],
     deps = [
-        requirement("absl-py"),
-        requirement("bottle"),
-        requirement("bottle-redis"),
+        "@pypi//absl_py",
+        "@pypi//flask",
+        "@pypi//redis",
     ],
 )
 
-container_image(
+oci_image(
     name = "server_image",
-    base = "@io_docker_index_library_python//image",
-    entrypoint = ["/server.par"],
-    files = [":server.par"],
+    base = "@docker_io_python",
+    entrypoint = ["/app/server"],
+    tars = py_image_layer(
+        name = "server_layer",
+        binary = ":server",
+        root = "/app/",
+    ),
+)
+
+oci_load(
+    name = "server_image.load",
+    image = ":server_image",
+    repo_tags = ["local_container_links_server:latest"],
+)
+
+filegroup(
+    name = "server_image.tar",
+    srcs = [":server_image.load"],
+    output_group = "tarball",
 )

examples/local_container_links/MODULE.bazel

@@ -0,0 +1,35 @@
+module(
+    name = "xmanager_local_container_links_bzlmod",
+    version = "1.0.0",
+)
+
+bazel_dep(name = "aspect_rules_py", version = "1.6.0")
+bazel_dep(name = "rules_python", version = "1.5.0-rc2")
+bazel_dep(name = "rules_oci", version = "2.2.6")
+bazel_dep(name = "rules_pkg", version = "1.1.0")
+
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+
+python.toolchain(python_version = "3.13")
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "pypi",
+    python_version = "3.13",
+    requirements_lock = "requirements.txt",
+)
+use_repo(pip, "pypi")
+
+oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
+
+oci.pull(
+    name = "docker_io_python",
+    digest = "sha256:034724ef64585eeb0e82385e9aabcbeabfe5f7cae2c2dcedb1da95114372b6d7",
+    image = "docker.io/library/python",
+    platforms = [
+        "linux/amd64",
+        "linux/arm64/v8",
+    ],
+    tag = "3.13-slim",
+)
+use_repo(oci, "docker_io_python", "docker_io_python_linux_amd64", "docker_io_python_linux_arm64_v8")

examples/local_container_links/README.md

@@ -1,6 +1,6 @@
 ## Description
 
-launcher.py packages and executes (locally) two Docker containers:
+`launcher.py` packages and executes (locally) two Docker containers:
 [Redis](https://hub.docker.com/_/redis), a key-value database, and a
 [Bottle](https://bottlepy.org/)-based HTTP server that listens on port 8080 and
 responds to requests at `/increment` by running

examples/local_arg_printer/WORKSPACE → examples/local_container_links/requirements.in

@@ -11,3 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+absl-py
+flask
+redis

examples/local_container_links/requirements.txt

@@ -1,17 +1,23 @@
-# Copyright 2021 DeepMind Technologies Limited
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-absl-py
-bottle
-bottle-redis
+# This file was autogenerated by uv via the following command:
+#    uv pip compile ./requirements.in -o ./requirements.txt
+absl-py==2.3.0
+    # via -r ./requirements.in
+blinker==1.9.0
+    # via flask
+click==8.2.1
+    # via flask
+flask==3.1.1
+    # via -r ./requirements.in
+itsdangerous==2.2.0
+    # via flask
+jinja2==3.1.6
+    # via flask
+markupsafe==3.0.2
+    # via
+    #   flask
+    #   jinja2
+    #   werkzeug
+redis==6.2.0
+    # via -r ./requirements.in
+werkzeug==3.1.3
+    # via flask

examples/local_container_links/server.py

@@ -1,41 +1,50 @@
-# Copyright 2021 DeepMind Technologies Limited
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
 """An HTTP server incrementing a value in Redis."""
 
+import time
 from typing import Sequence
 
 from absl import app
 from absl import flags
-import bottle
-import bottle.ext.redis
+from flask import Flask
+import redis
 
-redis_host = flags.DEFINE_string('redis_host', None, "Redis' host.")
+redis_host = flags.DEFINE_string("redis_host", None, "Address to Redis server.")
 
-server = bottle.Bottle()
+server = Flask(__name__)
 
 
-@server.route('/increment')
-def increment(rdb):
-  return str(rdb.incr('counter'))
+@server.route("/increment")
+def increment():
+  rdb = server.config["RDB"]
+  counter = rdb.incr("counter")
+  return f"{counter=}"
+
+
+@server.route("/")
+def index():
+  rdb = server.config["RDB"]
+  counter = int(rdb.get("counter"))
+  return f"{counter=}\nIncrement it by visiting `/increment`."
 
 
 def main(argv: Sequence[str]) -> None:
-  del argv  # Unused.
+  del argv
+
+  rdb = redis.Redis(host=redis_host.value, decode_responses=True)
+
+  while True:
+    print("Waiting for Redis to be available...")
+    try:
+      rdb.ping()
+      break
+    except redis.exceptions.ConnectionError:
+      time.sleep(1)
+
+  server.config["RDB"] = rdb
+  rdb.set("counter", 0)
 
-  server.install(bottle.ext.redis.RedisPlugin(host=redis_host.value))
-  bottle.run(server, host='0.0.0.0', port=8080, debug=True)
+  server.run(host="0.0.0.0", port=8080, debug=False)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
   app.run(main)