feat: cdnsd role (#67)

Signed-off-by: Chris Gianelloni <[email protected]>

roles/cdnsd/README.md

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+cdnsd
+=========
+
+This role deploys a cDNSd instance.
+
+Requirements
+------------
+
+Any pre-requisites that may not be covered by Ansible itself or the role should
+be mentioned here. For instance, if the role uses the EC2 module, it may be a
+good idea to mention in this section that the boto package is required.
+
+Role Variables
+--------------
+
+A description of the settable variables for this role should go here, including
+any variables that are in defaults/main.yml, vars/main.yml, and any variables
+that can/should be set via parameters to the role. Any variables that are read
+from other roles and/or the global scope (ie. hostvars, group vars, etc.)
+should be mentioned here as well.
+
+Dependencies
+------------
+
+A list of other roles hosted on Galaxy should go here, plus any details in
+regards to parameters that may need to be set for other roles, or variables
+that are used from other roles.
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables
+passed in as parameters) is always nice for users too:
+
+```yaml
+    - hosts: servers
+      tasks:
+        - include_role:
+            name: blinklabs.cardano.cdnsd
+```
+
+License
+-------
+
+Apache 2.0
+
+Author Information
+------------------
+
+An optional section for the role authors to include contact information, or a website (HTML is not allowed).

roles/cdnsd/defaults/main.yml

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+---
+# Install method
+cdnsd_install_method: 'docker'
+
+# cDNSd version
+cdnsd_version: '0.11.1'
+
+# Base host directory for node data
+cardano_node_dir: /opt/cardano
+
+# DB directory for host/container
+cdnsd_db_dir: '{{ cardano_node_dir }}/cdnsd'
+cdnsd_db_container_dir: '/db'
+
+# User/group for file/directory ownership
+cardano_node_user: root
+cardano_node_group: root
+
+# Docker image
+cdnsd_docker_image: 'ghcr.io/blinklabs-io/cdnsd:v{{ cdnsd_version }}'
+
+# Docker container name
+cdnsd_docker_container_name: cdnsd
+
+# Port for host/container
+cdnsd_container_port: 53
+cdnsd_port: 20053
+
+# Cardano network
+cdnsd_network: preprod
+
+# Configuration variables
+cdnsd_indexer_script_address: "addr_test1vr75xezmpxastymx985l3gamuxrwqdwcfrcnjlygs55aynsqu3edq"
+cdnsd_indexer_intercept_slot: "50844079"
+cdnsd_indexer_intercept_hash: "81325118471fddb00a20327572b371aee7cce13b846a18500d011b9cefd2a34c"

roles/cdnsd/meta/main.yml

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+galaxy_info: {}
+
+dependencies: []

roles/cdnsd/tasks/docker.yml

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+---
+- name: Initialize cdnsd_docker_volumes fact
+  set_fact:
+    cdnsd_docker_volumes: '{{ cdnsd_docker_volumes | default([]) + [item] }}'
+  loop:
+    - '{{ cdnsd_db_dir }}:{{ cdnsd_db_container_dir }}'
+
+- name: Create container
+  docker_container:
+    name: '{{ cdnsd_docker_container_name }}'
+    image: '{{ cdnsd_docker_image }}'
+    restart_policy: unless-stopped
+    env:
+      DNS_LISTEN_PORT: '{{ cdnsd_container_port }}'
+      STATE_DIR: '{{ cdnsd_db_container_dir }}'
+      INDEXER_SCRIPT_ADDRESS: '{{ cdnsd_indexer_script_address }}'
+      INDEXER_INTERCEPT_SLOT: '{{ cdnsd_indexer_intercept_slot | string }}'
+      INDEXER_INTERCEPT_HASH: '{{ cdnsd_indexer_intercept_hash }}'
+      INDEXER_NETWORK: '{{ cdnsd_network }}'
+    ports:
+      - '{{ cdnsd_port }}:{{ cdnsd_container_port }}'
+    volumes: '{{ cdnsd_docker_volumes | list }}'

roles/cdnsd/tasks/main.yml

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+---
+- name: Check install method
+  vars:
+    _allowed_install_methods: ['docker']
+  ansible.builtin.assert:
+    that:
+      - cdnsd_install_method in _allowed_install_methods
+    fail_msg: 'The specified install method ({{ cdnsd_install_method }}) is not one of the allowed values ({{ _allowed_install_methods | join(", ") }})'
+
+# We use the node owner and group
+- name: Create directories
+  ansible.builtin.file:
+    state: directory
+    path: '{{ item }}'
+    owner: '{{ cardano_node_user | string }}'
+    group: '{{ cardano_node_group | string }}'
+    mode: '0755'
+  loop:
+    - '{{ cdnsd_db_dir }}'
+
+- name: Include docker-related tasks
+  ansible.builtin.include_tasks: docker.yml
+  when: cdnsd_install_method == 'docker'