monitoring: T4315: Add telegraf output plugin prometheus-client

Add output Plugin "prometheus-client" for telegraf:
  set service monitoring telegraf prometheus-client

3 files changed, 117 insertions, 6 deletions

diff --git a/data/templates/monitoring/telegraf.j2 b/data/templates/monitoring/telegraf.j2
index cf33eec4e..336a1d2c4 100644
--- a/data/templates/monitoring/telegraf.j2
+++ b/data/templates/monitoring/telegraf.j2
@@ -14,12 +14,28 @@
   logfile = ""
   hostname = ""
   omit_hostname = false
+{% if influxdb_configured is vyos_defined %}
 [[outputs.influxdb_v2]]
   urls = ["{{ url }}:{{ port }}"]
   insecure_skip_verify = true
   token = "$INFLUX_TOKEN"
   organization = "{{ authentication.organization }}"
   bucket = "{{ bucket }}"
+{% endif %}
+{% if prometheus_client is vyos_defined %}
+[[outputs.prometheus_client]]
+  ## Address to listen on
+  listen = "{{ prometheus_client.listen_address if prometheus_client.listen_address is vyos_defined else '' }}:{{ prometheus_client.port }}"
+  metric_version = {{ prometheus_client.metric_version }}
+{%     if prometheus_client.authentication.username is vyos_defined and prometheus_client.authentication.password is vyos_defined  %}
+  ## Use HTTP Basic Authentication
+  basic_username = "{{ prometheus_client.authentication.username }}"
+  basic_password = "{{ prometheus_client.authentication.password }}"
+{%     endif %}
+{%     if prometheus_client.allow_from is vyos_defined %}
+  ip_range = {{ prometheus_client.allow_from }}
+{%     endif %}
+{% endif %}
 [[inputs.cpu]]
     percpu = true
     totalcpu = true
@@ -50,6 +66,7 @@
   server = "unixgram:///run/telegraf/telegraf_syslog.sock"
   best_effort = true
   syslog_standard = "RFC3164"
+{% if influxdb_configured is vyos_defined %}
 [[inputs.exec]]
   commands = [
     "{{ custom_scripts_dir }}/show_firewall_input_filter.py",
@@ -58,3 +75,4 @@
   ]
   timeout = "10s"
   data_format = "influx"
+{% endif %}
diff --git a/interface-definitions/service_monitoring_telegraf.xml.in b/interface-definitions/service_monitoring_telegraf.xml.in
index 01bc16fc9..021174701 100644
--- a/interface-definitions/service_monitoring_telegraf.xml.in
+++ b/interface-definitions/service_monitoring_telegraf.xml.in
@@ -85,6 +85,89 @@
                 </properties>
                 <defaultValue>all</defaultValue>
               </leafNode>
+              <node name="prometheus-client">
+                <properties>
+                  <help>Output plugin Prometheus client</help>
+                </properties>
+                <children>
+                  <node name="authentication">
+                    <properties>
+                      <help>HTTP basic authentication parameters</help>
+                    </properties>
+                    <children>
+                      <leafNode name="username">
+                        <properties>
+                          <help>Authentication username</help>
+                        </properties>
+                      </leafNode>
+                      <leafNode name="password">
+                        <properties>
+                          <help>Authentication password</help>
+                          <valueHelp>
+                            <format>txt</format>
+                            <description>Authentication password</description>
+                          </valueHelp>
+                        </properties>
+                      </leafNode>
+                    </children>
+                  </node>
+                  <leafNode name="allow-from">
+                    <properties>
+                      <help>Networks allowed to query this server</help>
+                      <valueHelp>
+                        <format>ipv4net</format>
+                        <description>IP address and prefix length</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>ipv6net</format>
+                        <description>IPv6 address and prefix length</description>
+                      </valueHelp>
+                      <multi/>
+                      <constraint>
+                        <validator name="ip-prefix"/>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="listen-address">
+                    <properties>
+                      <help>Local IP addresses to listen on</help>
+                      <completionHelp>
+                        <script>${vyos_completion_dir}/list_local_ips.sh --both</script>
+                      </completionHelp>
+                      <valueHelp>
+                        <format>ipv4</format>
+                        <description>IPv4 address to listen for incoming connections</description>
+                      </valueHelp>
+                      <valueHelp>
+                        <format>ipv6</format>
+                        <description>IPv6 address to listen for incoming connections</description>
+                      </valueHelp>
+                      <constraint>
+                        <validator name="ipv4-address"/>
+                        <validator name="ipv6-address"/>
+                        <validator name="ipv6-link-local"/>
+                      </constraint>
+                    </properties>
+                  </leafNode>
+                  <leafNode name="metric-version">
+                    <properties>
+                      <help>Metric version control mapping from Telegraf to Prometheus format</help>
+                      <valueHelp>
+                        <format>u32:1-2</format>
+                        <description>Metric version (default: 2)</description>
+                      </valueHelp>
+                      <constraint>
+                        <validator name="numeric" argument="--range 1-2"/>
+                      </constraint>
+                    </properties>
+                    <defaultValue>2</defaultValue>
+                  </leafNode>
+                  #include <include/port-number.xml.i>
+                  <leafNode name="port">
+                    <defaultValue>9273</defaultValue>
+                  </leafNode>
+                </children>
+              </node>
               <leafNode name="url">
                 <properties>
                   <help>Remote URL [REQUIRED]</help>
diff --git a/src/conf_mode/service_monitoring_telegraf.py b/src/conf_mode/service_monitoring_telegraf.py
index 94bc02f10..2398b0174 100755
--- a/src/conf_mode/service_monitoring_telegraf.py
+++ b/src/conf_mode/service_monitoring_telegraf.py
@@ -99,6 +99,15 @@ def get_config(config=None):
     monitoring['interfaces_ethernet'] = get_interfaces('ethernet', vlan=False)
     monitoring['nft_chains'] = get_nft_filter_chains()
 
+    if 'authentication' in monitoring or \
+       'url' in monitoring:
+        monitoring['influxdb_configured'] = True
+
+    # Ignore default XML values if config doesn't exists
+    # Delete key from dict
+    if not conf.exists(base + ['prometheus-client']):
+        del monitoring['prometheus_client']
+
     return monitoring
 
 def verify(monitoring):
@@ -106,13 +115,14 @@ def verify(monitoring):
     if not monitoring:
         return None
 
-    if 'authentication' not in monitoring or \
-       'organization' not in monitoring['authentication'] or \
-       'token' not in monitoring['authentication']:
-        raise ConfigError(f'Authentication "organization and token" are mandatory!')
+    if 'influxdb_configured' in monitoring:
+        if 'authentication' not in monitoring or \
+           'organization' not in monitoring['authentication'] or \
+           'token' not in monitoring['authentication']:
+            raise ConfigError(f'Authentication "organization and token" are mandatory!')
 
-    if 'url' not in monitoring:
-        raise ConfigError(f'Monitoring "url" is mandatory!')
+        if 'url' not in monitoring:
+            raise ConfigError(f'Monitoring "url" is mandatory!')
 
     return None