completed SMS gateway project

app/models/concerns/metrics.rb

@@ -0,0 +1,81 @@
+module Metrics
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def increment_counter(metric_name, amount = 1)
+      cache_key = "metrics:#{metric_name}"
+      current_value = Rails.cache.read(cache_key) || 0
+      Rails.cache.write(cache_key, current_value + amount)
+    end
+
+    def decrement_counter(metric_name, amount = 1)
+      cache_key = "metrics:#{metric_name}"
+      current_value = Rails.cache.read(cache_key) || 0
+      new_value = [current_value - amount, 0].max
+      Rails.cache.write(cache_key, new_value)
+    end
+
+    def get_counter(metric_name)
+      cache_key = "metrics:#{metric_name}"
+      Rails.cache.read(cache_key) || 0
+    end
+
+    def reset_counter(metric_name)
+      cache_key = "metrics:#{metric_name}"
+      Rails.cache.delete(cache_key)
+    end
+
+    def set_gauge(metric_name, value)
+      cache_key = "metrics:gauge:#{metric_name}"
+      Rails.cache.write(cache_key, value)
+    end
+
+    def get_gauge(metric_name)
+      cache_key = "metrics:gauge:#{metric_name}"
+      Rails.cache.read(cache_key)
+    end
+
+    # Record timing metrics
+    def record_timing(metric_name, duration_ms)
+      cache_key = "metrics:timing:#{metric_name}"
+      timings = Rails.cache.read(cache_key) || []
+      timings << duration_ms
+      # Keep only last 100 measurements
+      timings = timings.last(100)
+      Rails.cache.write(cache_key, timings)
+    end
+
+    def get_timing_stats(metric_name)
+      cache_key = "metrics:timing:#{metric_name}"
+      timings = Rails.cache.read(cache_key) || []
+
+      return nil if timings.empty?
+
+      {
+        count: timings.size,
+        avg: timings.sum / timings.size.to_f,
+        min: timings.min,
+        max: timings.max,
+        p95: percentile(timings, 95),
+        p99: percentile(timings, 99)
+      }
+    end
+
+    private
+
+    def percentile(array, percent)
+      return nil if array.empty?
+
+      sorted = array.sort
+      k = (percent / 100.0) * (sorted.length - 1)
+      f = k.floor
+      c = k.ceil
+
+      if f == c
+        sorted[k]
+      else
+        sorted[f] * (c - k) + sorted[c] * (k - f)
+      end
+    end
+  end
+end