From 8429cbfd6e39ae43c5ac855ffd223092f8fe59c5 Mon Sep 17 00:00:00 2001
From: Mikayla Fischler <mikayla@ky8.io>
Date: Tue, 25 Jan 2022 13:51:43 -0500
Subject: [PATCH] scada alarms

---
 scada-common/alarm.lua | 54 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 scada-common/alarm.lua

diff --git a/scada-common/alarm.lua b/scada-common/alarm.lua
new file mode 100644
index 0000000..b93df73
--- /dev/null
+++ b/scada-common/alarm.lua
@@ -0,0 +1,54 @@
+SEVERITY = {
+    INFO = 0,       -- basic info message
+    WARNING = 1,    -- warning about some abnormal state
+    ALERT = 2,      -- important device state changes
+    FACILITY = 3,   -- facility-wide alert
+    SAFETY = 4,     -- safety alerts
+    EMERGENCY = 5   -- critical safety alarm
+}
+
+function scada_alarm(severity, device, message)
+    local self = {
+        time = os.time(),
+        ts_string = os.date("[%H:%M:%S]"),
+        severity = severity,
+        device = device,
+        message = message
+    }
+
+    local format = function ()
+        return self.ts_string .. " [" .. severity_to_string(self.severity) .. "] (" .. self.device ") >> " .. self.message
+    end
+
+    local properties = function ()
+        return {
+            time = self.time,
+            severity = self.severity,
+            device = self.device,
+            message = self.message
+        }
+    end
+
+    return {
+        format = format,
+        properties = properties
+    }
+end
+
+function severity_to_string(severity)
+    if severity == SEVERITY.INFO then
+        return "INFO"
+    elseif severity == SEVERITY.WARNING then
+        return "WARNING"
+    elseif severity == SEVERITY.ALERT then
+        return "ALERT"
+    elseif severity == SEVERITY.FACILITY then
+        return "FACILITY"
+    elseif severity == SEVERITY.SAFETY then
+        return "SAFETY"
+    elseif severity == SEVERITY.EMERGENCY then
+        return "EMERGENCY"
+    else
+        return "UNKNOWN"
+    end
+end