docs: add changelog entry and update contributing guide for uv migration

.github/workflows/integration_test.yaml

@@ -5,16 +5,19 @@ on:
 
 jobs:
   integration-tests:
-    uses: canonical/operator-workflows/.github/workflows/integration_test.yaml@main
+    uses: 
+      canonical/operator-workflows/.github/workflows/integration_test.yaml@main
     secrets: inherit
     with:
       provider: lxd
       juju-channel: 3/stable
       self-hosted-runner: true
       charmcraft-channel: latest/edge
-      modules: '["test_action.py","test_actions.py","test_charm.py","test_config.py","test_cos.py","test_ha.py","test_haproxy_route.py","test_http_interface.py","test_ingress.py", "test_ingress_per_unit.py", "test_haproxy_route_tcp.py"]'
+      modules: '["test_action.py","test_actions.py","test_charm.py","test_config.py","test_cos.py","test_ha.py","test_haproxy_route.py","test_http_interface.py","test_ingress.py",
+        "test_ingress_per_unit.py", "test_haproxy_route_tcp.py"]'
+      with-uv: true
   allure-report:
     if: always() && !cancelled()
     needs:
-      - integration-tests
+    - integration-tests
     uses: canonical/operator-workflows/.github/workflows/allure_report.yaml@main

.github/workflows/load_test.yaml

@@ -2,12 +2,14 @@ name: Load tests
 
 on:
   schedule:
-    - cron: "0 12 * * 0"
+  - cron: "0 12 * * 0"
 
 jobs:
   load-tests:
-    uses: canonical/operator-workflows/.github/workflows/integration_test.yaml@main
+    uses: 
+      canonical/operator-workflows/.github/workflows/integration_test.yaml@main
     with:
       load-test-enabled: true
       load-test-run-args: "-e LOAD_TEST_HOST=localhost"
+      with-uv: true
     secrets: inherit

.github/workflows/test.yaml

@@ -11,3 +11,4 @@ jobs:
       self-hosted-runner: true
       self-hosted-runner-image: "noble"
       charmcraft-channel: latest/edge
+      with-uv: true

.licenserc.yaml

@@ -27,4 +27,5 @@ header:
     - 'src/loki_alert_rules/*.rule'
     - 'docs/release-notes/**/*.yaml'
     - '**/*.md.j2'
+    - 'uv.lock'
   comment: on-failure

CONTRIBUTING.md

@@ -1,11 +1,32 @@
 # Contributing
 
+## Developing
+
 To make contributions to this charm, you'll need a working [development setup](https://documentation.ubuntu.com/juju/3.6/howto/manage-your-juju-deployment/set-up-your-juju-deployment-local-testing-and-development/).
 
-You can create an environment for development with `tox`:
+The code for this charm can be downloaded as follows:
+
+```
+git clone https://github.com/canonical/haproxy-operator
+```
+
+Make sure to install [uv](https://docs.astral.sh/uv/), for example:
+
+```sh
+sudo snap install astral-uv --classic
+```
+
+Then install `tox` with extensions, as well as a range of Python versions:
+
+```sh
+uv tool install tox --with tox-uv
+uv tool update-shell
+```
+
+To create an environment for development, use:
 
 ```shell
-tox devenv -e integration
+uv sync --all-groups
 source venv/bin/activate
 ```
 

charmcraft.yaml

@@ -9,25 +9,23 @@ platforms:
 
 parts:
   charm:
-    build-packages:
-      - build-essential
-      - python3-dev
-      - pkg-config
-      - libffi-dev
-      - libssl-dev
-      - git
+    source: .
+    plugin: uv
     build-snaps:
-      - rustup
-    override-build: |
-      rustup default stable
-      craftctl default
-
+    - astral-uv
+    build-packages:
+    - git
+  templates:
+    plugin: dump
+    source: .
+    stage:
+    - templates
 name: haproxy
 title: HAProxy charm.
 description: |
   A [Juju](https://juju.is/) [charm](https://juju.is/docs/olm/charmed-operators)
   deploying and managing [HAProxy](https://www.haproxy.org/) on machines.
-  
+
   HAProxy is a TCP/HTTP reverse proxy which is particularly suited for high
   availability environments. It features connection persistence through HTTP
   cookies, load balancing, header addition, modification, deletion both ways. It
@@ -38,14 +36,15 @@ description: |
   VMs and bare metal.
 summary: Fast and reliable load balancing reverse proxy.
 links:
-  documentation: https://discourse.charmhub.io/t/haproxy-documentation-overview/17216
+  documentation: 
+    https://discourse.charmhub.io/t/haproxy-documentation-overview/17216
   issues: https://github.com/canonical/haproxy-operator/issues
   source: https://github.com/canonical/haproxy-operator
   contact:
-    - https://launchpad.net/~canonical-is-devops
+  - https://launchpad.net/~canonical-is-devops
 
 assumes:
-  - juju >= 3.3
+- juju >= 3.3
 requires:
   certificates:
     interface: tls-certificates
@@ -85,21 +84,22 @@ config:
       default: 4096
       type: int
       description: |
-          Sets the maximum per-process number of concurrent connections to
-          <number>. Must be greater than 0.
+        Sets the maximum per-process number of concurrent connections to
+        <number>. Must be greater than 0.
     vip:
       type: string
       description: Virtual IP address, used in active-passive ha mode.
 
 actions:
   get-certificate:
-    description: Returns the TLS Certificate. Intended for testing and debugging purposes.
+    description: Returns the TLS Certificate. Intended for testing and debugging
+      purposes.
     params:
       hostname:
         type: string
         description: Hostname to extract certs from.
     required:
-      - hostname
+    - hostname
   get-proxied-endpoints:
     description: |
       Return a list of endpoints 
@@ -113,5 +113,5 @@ actions:
           If no backend with this name is present, an empty list is returned.
 
 charm-libs:
-  - lib: traefik_k8s.ingress_per_unit
-    version: "1"
+- lib: traefik_k8s.ingress_per_unit
+  version: "1"

docs/changelog.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 Each revision is versioned by the date of the revision.
 
+## 2025-11-12
+
+- Migrated development tooling to uv and ruff for faster dependency management and linting.
+
 ## 2025-10-14
 
 - Added action `get-proxied-endpoints`.

lib/charms/haproxy/v0/haproxy_route_tcp.py

@@ -174,7 +174,7 @@ def _on_haproxy_route_data_available(self, event: EventBase) -> None:
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 1
+LIBPATCH = 2
 
 logger = logging.getLogger(__name__)
 HAPROXY_ROUTE_TCP_RELATION_NAME = "haproxy-route-tcp"
@@ -575,7 +575,7 @@ class TcpRequirerApplicationData(_DatabagModel):
     port: int = Field(description="The port exposed on the provider.", gt=0, le=65535)
     backend_port: Optional[int] = Field(
         description=(
-            "The port where the backend service is listening. " "Defaults to the provider port."
+            "The port where the backend service is listening. Defaults to the provider port."
         ),
         default=None,
         gt=0,
@@ -1162,7 +1162,7 @@ def provide_haproxy_route_tcp_requirements(
         self.update_relation_data()
 
     # pylint: disable=too-many-arguments,too-many-positional-arguments,too-many-locals
-    def _generate_application_data(  # noqa: C901
+    def _generate_application_data(
         self,
         *,
         port: Optional[int] = None,
@@ -1625,10 +1625,8 @@ def configure_bandwidth_limit(
         """
         if not upload_bytes_per_second and not download_bytes_per_second:
             logger.error(
-                (
-                    "At least one of `upload_bytes_per_second` "
-                    "or `upload_bytes_per_second` must be set."
-                )
+                "At least one of `upload_bytes_per_second` "
+                "or `upload_bytes_per_second` must be set."
             )
             return self
         self._application_data["bandwidth_limit"] = {
@@ -1677,10 +1675,8 @@ def configure_timeout(
             server_timeout_in_seconds or connect_timeout_in_seconds or queue_timeout_in_seconds
         ):
             logger.error(
-                (
-                    "At least one of `server_timeout_in_seconds`, `connect_timeout_in_seconds` "
-                    "or `queue_timeout_in_seconds` must be set."
-                )
+                "At least one of `server_timeout_in_seconds`, `connect_timeout_in_seconds` "
+                "or `queue_timeout_in_seconds` must be set."
             )
             return self
         self._application_data["timeout"] = self._generate_timeout_configuration(

lib/charms/haproxy/v1/haproxy_route.py

@@ -151,7 +151,7 @@ def _on_haproxy_route_data_available(self, event: EventBase) -> None:
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 7
+LIBPATCH = 8
 
 logger = logging.getLogger(__name__)
 HAPROXY_ROUTE_RELATION_NAME = "haproxy-route"
@@ -875,9 +875,9 @@ def publish_proxied_endpoints(self, endpoints: list[str], relation: Relation) ->
             endpoints: The list of proxied endpoints to publish.
             relation: The relation with the requirer application.
         """
-        HaproxyRouteProviderAppData(
-            endpoints=list(map(lambda x: cast(AnyHttpUrl, x), endpoints))
-        ).dump(relation.data[self.charm.app], clear=True)
+        HaproxyRouteProviderAppData(endpoints=[cast(AnyHttpUrl, e) for e in endpoints]).dump(
+            relation.data[self.charm.app], clear=True
+        )
 
 
 class HaproxyRouteEnpointsReadyEvent(EventBase):