boardwalkd (feat): add Slack commands for catching/releasing workspaces

Adds Slack integration to `boardwalkd` through means of a Slack App, such that
it is now possible to quickly view the status of workspaces--along with the
logged events--as well as catch or release workspaces from within Slack. This is
intended to augment--not replace--the web dashboard.

Using the Slack [app manifest](https://api.slack.com/reference/manifests)
located within `slack_app_manifest.yaml`, an individual implementing Boardwalk
can quickly conmfigure the required settings for the app. Additional
configuration, if desired, may be done after--or before by directly editing the
manifest--the app is [created within Slack's
system](https://api.slack.com/apps?new_app=1).

Using this feature is done by providing a Slack app and bot token, in the
`BOARDWALKD_SLACK_APP_TOKEN` and `BOARDWALKD_SLACK_BOT_TOKEN` environment
variables.

Features provided by this integration include:
1. A Slack app home page, which displays at a glance statuses for configured
   workspaces
2. The ability to catch or release one, multiple, or all workspaces.
3. Viewing the details of a specified workspace.
4. Adds the following Slack slash-commands:
    - `/brdwlk-version` - Returns the currently running version of Boardwalk.
    - `/brdwlk-catch-release` - Allows one or more workspaces to be caught or
      released from a single modal.
    - `/brdwlk-list` - Lists workspaces with an active worker

ATTRIBUTIONS.md

@@ -0,0 +1,6 @@
+- Boardwalk icon (`src/boardwalkd/static/boardwalk_icon.jpg`) - Cropped from a
+  public domain image from
+  [Ingolfson](https://commons.wikimedia.org/wiki/User:Ingolfson) on [Wikimedia
+  Commons](https://commons.wikimedia.org/wiki/File:Swampy_But_Pretty_Bog_In_Fiordland_NZ.jpg)
+- GitHub Corner code in `src/boardwalkd/templates/base.html` - MIT licensed,
+  from [tholman/github-corners](https://github.com/tholman/github-corners)

Dockerfile

@@ -1,11 +1,11 @@
-FROM python:3.11 AS build
+FROM docker.io/python:3.11 AS build
 WORKDIR /build
 COPY . .
 RUN python3 -m pip install --user pipx \
     && PATH=PATH:/root/.local/bin pipx install poetry \
     && PATH=PATH:/root/.local/bin poetry build
 
-FROM python:3.11-slim
+FROM docker.io/python:3.11-slim
 COPY --from=build /build/dist ./dist
 ENV DEBIAN_FRONTEND=noninteractive
 RUN groupadd -g 1000 not_root && useradd -u 1000 -g 1000 not_root \

README.md

@@ -1,4 +1,12 @@
 # Boardwalk
+![>](src/boardwalkd/static/boardwalk_icon.jpg)
+
+<style>
+    img[alt$=">"] {
+        float: right;
+        width: 25%;
+    }
+</style>
 
 Boardwalk is a linear [Ansible](https://www.ansible.com/) workflow engine. It's
 purpose-built to help systems engineers automate low-and-slow background jobs

pyproject.toml

@@ -7,7 +7,7 @@ requires-python = ">=3.11"
 
 [tool.poetry]
 name = "boardwalk"
-version = "0.8.18"
+version = "0.8.19-rc.0"
 description = "Boardwalk is a linear Ansible workflow engine"
 readme = "README.md"
 authors = [
@@ -44,6 +44,8 @@ cryptography = ">=38.0.3"
 email-validator = ">=1.3.0"  # Required by pydantic to validate emails using EmailStr
 pydantic = ">=2.4.2"
 tornado = ">=6.2"
+slack-bolt = "^1.18.1"
+aiohttp = "^3.9.3"           # Required by slack-bolt's AsyncApp
 
 [tool.poetry.group.dev.dependencies]
 pyright = "==1.1.350"
@@ -61,6 +63,7 @@ line-length = 120
 extend-exclude = [
     "typings/*",
 ]
+
 lint.extend-select = [
     "I",            # isort (import sorting)
     "W",            # pycodestyle warnings

slack_app_manifest.yaml

@@ -0,0 +1,51 @@
+display_information:
+  name: BoardwalkTest
+  description: Boardwalk is a linear Ansible workflow engine.
+  background_color: "#11359e"
+  long_description: "Boardwalk is a linear Ansible workflow engine. It's purpose-built to help systems engineers automate low-and-slow background jobs against large numbers of production hosts. It's ideal for rolling-maintenance jobs like kernel and operating system upgrades.\r
+
+    \r
+
+    This Slack application is intended to serve as a quick interface to one of the more common reasons one might visit the dashboard: that being to catch or release workspaces.\r
+
+    \r
+
+    License: MIT\r
+
+    Source code: https://github.com/Backblaze/boardwalk/"
+features:
+  app_home:
+    home_tab_enabled: true
+    messages_tab_enabled: true
+    messages_tab_read_only_enabled: false
+  bot_user:
+    display_name: Boardwalk
+    always_online: true
+  slash_commands:
+    - command: /brdwlk-version
+      description: Get the current version of Boardwalk
+      should_escape: false
+    - command: /brdwlk-catch-release
+      description: Catch or release workspace(s)
+      should_escape: false
+    - command: /brdwlk-list
+      description: List workspaces with an active worker
+      should_escape: false
+oauth_config:
+  scopes:
+    bot:
+      - chat:write
+      - commands
+      - im:write
+      - incoming-webhook
+      - users:read
+      - users:read.email
+settings:
+  event_subscriptions:
+    bot_events:
+      - app_home_opened
+  interactivity:
+    is_enabled: true
+  org_deploy_enabled: false
+  socket_mode_enabled: true
+  token_rotation_enabled: false

src/boardwalkd/broadcast.py

@@ -2,10 +2,11 @@
 Code for handling server broadcasts
 """
 
-import json
-import logging
-
-from tornado.httpclient import AsyncHTTPClient, HTTPError, HTTPRequest
+from slack_sdk.models.blocks import (
+    MarkdownTextObject,
+    SectionBlock,
+)
+from slack_sdk.webhook.async_client import AsyncWebhookClient
 
 from boardwalkd.protocol import WorkspaceEvent
 
@@ -30,46 +31,20 @@ async def handle_slack_broadcast(
         slack_message_severity = ":red_circle: ERROR"
     else:
         raise ValueError(f"Event severity is invalid: {event.severity}")
-    slack_message_blocks = {
-        "blocks": [
-            {
-                "type": "section",
-                "fields": [
-                    {
-                        "type": "mrkdwn",
-                        "text": f"*{slack_message_severity}*",
-                    },
-                    {
-                        "type": "mrkdwn",
-                        "text": f"*<{server_url}#{workspace}|{workspace}>*",
-                    },
-                ],
-            },
-            {
-                "type": "section",
-                "text": {
-                    "type": "mrkdwn",
-                    "text": f"```\n{event.message}\n```",
-                },
-            },
-        ]
-    }
-    payload = json.dumps(slack_message_blocks)
 
-    async def post_msg(url: str):
-        request = HTTPRequest(
-            method="POST",
-            headers={"Content-Type": "application/json"},
-            body=payload,
-            url=url,
-        )
-        client = AsyncHTTPClient()
-        try:
-            await client.fetch(request)
-        except HTTPError as e:
-            logging.error(f"slack_webhook:{e}")
+    slack_message_blocks = [
+        SectionBlock(
+            fields=[
+                MarkdownTextObject(text=f"*{slack_message_severity}*"),
+                MarkdownTextObject(text=f"*<{server_url}#{workspace}|{workspace}>*"),
+            ]
+        ),
+        SectionBlock(text=MarkdownTextObject(text=f"```\n{event.message}\n```")),
+    ]
 
     if error_webhook_url and event.severity == "error":
-        await post_msg(error_webhook_url)
+        webhook_client = AsyncWebhookClient(url=error_webhook_url)
+        await webhook_client.send(blocks=slack_message_blocks)
     elif webhook_url:
-        await post_msg(webhook_url)
+        webhook_client = AsyncWebhookClient(url=webhook_url)
+        await webhook_client.send(blocks=slack_message_blocks)

src/boardwalkd/cli.py

@@ -34,7 +34,7 @@ def cli():
 @cli.command(context_settings=CONTEXT_SETTINGS)
 @click.option(
     "--auth-expire-days",
-    help=("The number of days login tokens and user API keys are valid before" " they expire"),
+    help=("The number of days login tokens and user API keys are valid before they expire"),
     type=float,
     default=14,
     show_default=True,
@@ -94,7 +94,7 @@ def cli():
 )
 @click.option(
     "--port",
-    help=("The non-TLS port number the server binds to. --port and/or" " --tls-port must be configured"),
+    help=("The non-TLS port number the server binds to. --port and/or --tls-port must be configured"),
     type=int,
     default=None,
 )
@@ -115,6 +115,23 @@ def cli():
     default=None,
     show_envvar=True,
 )
+@click.option(
+    "--slack-app-token",
+    help=(
+        "A Slack App Token for the Slack App this Boardwalkd instance is to connect to."
+        " If specified, --slack-bot-token must also be provided."
+    ),
+    type=str,
+    default=None,
+    show_envvar=True,
+)
+@click.option(
+    "--slack-bot-token",
+    help=("A Slack OAuth Bot Token for the Slack App this Boardwalkd instance is to connect to."),
+    type=str,
+    default=None,
+    show_envvar=True,
+)
 @click.option(
     "--tls-crt",
     help=("Path to TLS certificate chain file for use along with --tls-port"),
@@ -155,6 +172,8 @@ def serve(
     port: int | None,
     slack_error_webhook_url: str,
     slack_webhook_url: str,
+    slack_app_token: str,
+    slack_bot_token: str,
     tls_crt: str | None,
     tls_key: str | None,
     tls_port: int | None,
@@ -173,17 +192,15 @@ def serve(
 
     # If there is no TLS port then reject setting a TLS key and cert
     if (not tls_port) and (tls_crt or tls_key):
-        raise BoardwalkException("--tls-crt and --tls-key should not be configured" " unless --tls-port is also set")
+        raise BoardwalkException("--tls-crt and --tls-key should not be configured unless --tls-port is also set")
 
     # Validate TLS configuration (key and cert paths are already validated by click)
     if tls_port is not None:
         try:
             assert tls_crt
             assert tls_key
         except AssertionError:
-            raise BoardwalkException(
-                "--tls-crt and --tls-key paths must be supplied when a" " --tls-port is configured"
-            )
+            raise BoardwalkException("--tls-crt and --tls-key paths must be supplied when a --tls-port is configured")
 
     # Validate --owner
     if owner:
@@ -196,6 +213,10 @@ def serve(
     else:
         owner = "[email protected]"
 
+    # Validate Slack app/bot token
+    if (not slack_bot_token) and slack_app_token:
+        raise BoardwalkException("If --slack-app-token is supplied, --slack-bot-token must also be supplied")
+
     asyncio.run(
         run(
             auth_expire_days=auth_expire_days,
@@ -204,6 +225,8 @@ def serve(
             host_header_pattern=host_header_regex,
             owner=owner,
             port_number=port,
+            slack_app_token=slack_app_token,
+            slack_bot_token=slack_bot_token,
             slack_error_webhook_url=slack_error_webhook_url,
             slack_webhook_url=slack_webhook_url,
             tls_crt_path=tls_crt,

src/boardwalkd/server.py

@@ -39,6 +39,8 @@
 
 module_dir = Path(__file__).resolve().parent
 state = load_state()
+SLACK_TOKENS: dict[str, str | None] = {"app": None, "bot": None}
+SERVER_URL: str | None = None
 atexit.register(state.flush)
 
 
@@ -272,7 +274,7 @@ async def get(self):  # pyright: ignore [reportIncompatibleMethodOverride]
             "boardwalk_user",
             anon_username,
             expires_days=self.settings["auth_expire_days"],
-            samesite="Strict",
+            samesite="Lax",  # To allow, for example, Slack to open the dashboard in a new window when the link is clicked from the Slack App
             secure=True,
         )
         return self.redirect(
@@ -944,6 +946,8 @@ async def run(
     port_number: int | None,
     tls_crt_path: str | None,
     tls_key_path: str | None,
+    slack_app_token: str | None,
+    slack_bot_token: str | None,
     tls_port_number: int | None,
     slack_error_webhook_url: str,
     slack_webhook_url: str,
@@ -988,4 +992,17 @@ async def run(
     state.users[owner].enabled = True
     state.flush()
 
+    # If configured, intialize Slack integration
+    if slack_app_token:
+        SLACK_TOKENS["app"] = slack_app_token
+        SLACK_TOKENS["bot"] = slack_bot_token
+
+        # Store the server URL so that other modules can read from it directly
+        global SERVER_URL
+        SERVER_URL = url
+
+        from boardwalkd import slack
+
+        await slack.connect()
+
     await asyncio.Event().wait()