enhancement(blackbox_exporter): allows using multiple web listen addresses

Signed-off-by: Christian Krause <christian.krause@idiv.de>

roles/blackbox_exporter/molecule/alternative/molecule.yml

@@ -3,10 +3,13 @@ provisioner:
   inventory:
     group_vars:
       all:
-        blackbox_exporter_web_listen_address: "127.0.0.1:9000"
+        blackbox_exporter_web_listen_address:
+          - '127.0.0.1:9000'
+          - '127.0.1.1:9000'
         blackbox_exporter_cli_flags:
           log.level: "warn"
         blackbox_exporter_configuration_modules:
           tcp_connect:
             prober: tcp
             timeout: 5s
+        blackbox_exporter_version: 0.23.0

roles/blackbox_exporter/molecule/alternative/tests/test_alternative.py

@@ -33,6 +33,9 @@ def test_service(host):
         raise  # Re-raise the original assertion error
 
 
-def test_socket(host):
-    s = host.socket("tcp://127.0.0.1:9000")
-    assert s.is_listening
+@pytest.mark.parametrize("sockets", [
+    "tcp://127.0.0.1:9000",
+    "tcp://127.0.1.1:9000",
+])
+def test_socket(host, sockets):
+    assert host.socket(sockets).is_listening

roles/blackbox_exporter/tasks/preflight.yml

@@ -20,10 +20,26 @@
   ansible.builtin.package_facts:
   when: "not 'packages' in ansible_facts"
 
+- name: Assert that used version supports listen address type
+  ansible.builtin.assert:
+    that:
+      - >-
+        blackbox_exporter_web_listen_address is string
+        or
+        (
+          blackbox_exporter_version is version('0.23.0', '>=') and
+          blackbox_exporter_web_listen_address | type_debug == "list"
+        )
+
 - name: Naive assertion of proper listen address
   ansible.builtin.assert:
     that:
-      - "':' in blackbox_exporter_web_listen_address"
+      - >-
+        [blackbox_exporter_web_listen_address] |
+          flatten |
+          reject('match', '.+:\\d+$') |
+          list |
+          length == 0
 
 - name: Discover latest version
   ansible.builtin.set_fact:

roles/blackbox_exporter/templates/blackbox_exporter.service.j2

@@ -16,7 +16,16 @@ ExecStart=/usr/local/bin/blackbox_exporter \
   {% for flag, flag_value in blackbox_exporter_cli_flags.items() -%}
   --{{ flag }}={{ flag_value }} \
   {% endfor -%}
+{% if blackbox_exporter_version is version('0.23.0', '>=') and
+      blackbox_exporter_web_listen_address is iterable and
+      blackbox_exporter_web_listen_address is not mapping and
+      blackbox_exporter_web_listen_address is not string %}
+{%   for address in blackbox_exporter_web_listen_address %}
+  --web.listen-address={{ address }}{{ " \\" if not loop.last else "" }}
+{%   endfor %}
+{% else %}
   --web.listen-address={{ blackbox_exporter_web_listen_address }}
+{% endif %}
 
 SyslogIdentifier=blackbox_exporter
 KillMode=process