From 815b15412f7e42a8981087fdd3a1fda00c33b956 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Fri, 31 Dec 2021 00:44:15 +0100
Subject: prometheus/node: add textfile collector sensors (WIP)

---
 .../prometheus/exporter/node/defaults/main.yml     | 36 +++++++++++++++
 .../prometheus/exporter/node/handlers/main.yml     |  5 +++
 .../node/tasks/textfile_collector_sensors.yml      | 32 ++++++++++++++
 .../textfile-collector-scripts/sensors.j2          | 51 ++++++++++++++++++++++
 .../textfile-collector-scripts/sensors.service.j2  | 33 ++++++++++++++
 .../textfile-collector-scripts/sensors.timer.j2    |  9 ++++
 6 files changed, 166 insertions(+)
 create mode 100644 roles/monitoring/prometheus/exporter/node/tasks/textfile_collector_sensors.yml
 create mode 100644 roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.j2
 create mode 100644 roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.service.j2
 create mode 100644 roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.timer.j2

(limited to 'roles/monitoring')

diff --git a/roles/monitoring/prometheus/exporter/node/defaults/main.yml b/roles/monitoring/prometheus/exporter/node/defaults/main.yml
index 0bcea14f..9e8bcf8b 100644
--- a/roles/monitoring/prometheus/exporter/node/defaults/main.yml
+++ b/roles/monitoring/prometheus/exporter/node/defaults/main.yml
@@ -16,3 +16,39 @@ prometheus_exporter_node_textfile_collector_scripts:
   - deleted-libraries
 #  - smartmon
 #  - chrony
+#  - sensors
+
+# prometheus_exporter_node_textfile_collector__sensors:
+#   i2c:
+#   - number: 1
+#     devices:
+#     - name: blub
+#       address: 0x5c
+#       type: am2315
+#     - address: 0x18
+#       type: ds2482
+#   - name: "10000900.i2c"
+#     devices:
+#     - address: 0x70
+#       type: pca9548
+#       channels:
+#       - number: 0
+#         devices:
+#         - name: foo
+#           address: 0x76
+#           type: bme280
+#       - number: 1
+#         devices:
+#         - name: bar
+#           address: 0x77
+#           type: bmp280
+#   w1:
+#   - name: temp1
+#     address: 28-987654321098
+#   - name: temp2
+#     address: 28-012345678901
+#   gpio:
+#   - name: everything-is-fine-and-dandy
+#     number: 0
+#   - name: something-went-horribly-wrong
+#     number: 1
diff --git a/roles/monitoring/prometheus/exporter/node/handlers/main.yml b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
index 56056ea6..8f5cb37c 100644
--- a/roles/monitoring/prometheus/exporter/node/handlers/main.yml
+++ b/roles/monitoring/prometheus/exporter/node/handlers/main.yml
@@ -8,3 +8,8 @@
   service:
     name: nginx
     state: reloaded
+
+- name: remove sensors state file
+  file:
+    path: /run/prometheus-node-exporter_sensors/state
+    state: absent
diff --git a/roles/monitoring/prometheus/exporter/node/tasks/textfile_collector_sensors.yml b/roles/monitoring/prometheus/exporter/node/tasks/textfile_collector_sensors.yml
new file mode 100644
index 00000000..966c6d7f
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/tasks/textfile_collector_sensors.yml
@@ -0,0 +1,32 @@
+---
+- name: install lua and libs needed by sensors script
+  apt:
+    name:
+    - lua5.1
+    - lua-cjson
+    - lua-posix
+    state: present
+
+- name: create lua 5.1 module path in /usr/local
+  file:
+    path: /usr/local/share/lua/5.1
+    state: directory
+
+- name: install sensors module
+  copy:
+    src: "{{ global_files_dir }}/common/openwrt/sensors.module_lua"
+    dest: /usr/local/share/lua/5.1/sensors.lua
+
+- name: create configure directory
+  file:
+    path: /etc/prometheus/exporter/node
+    state: directory
+
+- name: generate senors config
+  copy:
+    content: "{{ prometheus_exporter_node_textfile_collector__sensors | to_nice_json }}\n"
+    dest: /etc/prometheus/exporter/node/sensors.json
+  notify: remove sensors state file
+
+- name: install the sensors textfile collector script
+  include_tasks: textfile_collector_generic.yml
diff --git a/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.j2 b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.j2
new file mode 100644
index 00000000..822aa3b5
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.j2
@@ -0,0 +1,51 @@
+#!/usr/bin/lua5.1
+
+local sensors = require "sensors"
+local units = {
+    temperature = "celsius",
+    humidity = "percent",
+    pressure = "pascals",
+    gpio = "status",
+}
+
+local function metric(name, mtype, labels, value)
+  print("# TYPE " .. name .. " " .. mtype)
+
+  local label_string = ""
+  if labels then
+    for label,value in pairs(labels) do
+      label_string =  label_string .. label .. '="' .. value .. '",'
+    end
+    label_string = "{" .. string.sub(label_string, 1, -2) .. "}"
+  end
+  print(string.format("%s%s %s", name, label_string, value))
+end
+
+local function scrape(config, num_sensors)
+    local readings, err = sensors.read(config)
+    if not readings then return end
+
+    metric("sensors_count_total", "gauge", nil, num_sensors)
+    for name, values in pairs(readings) do
+        labels = { name = name, kind = values._kind_ }
+        for t, v in pairs(values) do
+            local unit = units[t]
+            if unit ~= nil then
+                metric("sensors_" .. t .. "_" .. unit, "gauge", labels, v)
+            end
+        end
+    end
+end
+
+function main()
+    local config, _ = sensors.read_config('/etc/prometheus/exporter/node/sensors.json')
+
+    -- TODO: only do this if sensor state file does not exist - else read num_sensors from state file
+    local num_sensors, err = sensors.setup(config)
+    if num_sensors == nil then error(err) end
+    -- TODO: write num_sensors to state file
+
+    scrape(config, num_sensors, units)
+end
+
+main()
diff --git a/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.service.j2 b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.service.j2
new file mode 100644
index 00000000..7a438317
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.service.j2
@@ -0,0 +1,33 @@
+[Unit]
+Description=Promethues node exporter textfile collector sensors
+
+[Service]
+Type=oneshot
+Environment=TMPDIR=/var/lib/prometheus-node-exporter/textfile-collector
+Environment=LC_NUMERIC=C
+ExecStart=bash -c "/usr/local/share/prometheus-node-exporter/sensors | sponge /var/lib/prometheus-node-exporter/textfile-collector/sensors.prom"
+TimeoutStartSec=30s
+
+# systemd hardening-options
+AmbientCapabilities=
+CapabilityBoundingSet=
+LockPersonality=true
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectControlGroups=true
+ProtectHome=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectSystem=strict
+ReadWritePaths=/var/lib/prometheus-node-exporter/textfile-collector
+RuntimeDirectory=prometheus-node-exporter_sensors
+RuntimeDirectoryPreserve=yes
+RemoveIPC=true
+RestrictNamespaces=true
+RestrictRealtime=true
+RestrictAddressFamilies=AF_UNIX
+SystemCallArchitectures=native
+
+[Install]
+WantedBy=multi-user.target
diff --git a/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.timer.j2 b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.timer.j2
new file mode 100644
index 00000000..164b4681
--- /dev/null
+++ b/roles/monitoring/prometheus/exporter/node/templates/textfile-collector-scripts/sensors.timer.j2
@@ -0,0 +1,9 @@
+[Unit]
+Description=Promethues node exporter textfile collector sensors
+
+[Timer]
+OnBootSec=50s
+OnUnitActiveSec=5min
+
+[Install]
+WantedBy=timers.target
-- 
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