Add status cache.

Author: huacnlee

.gitignore

@@ -1,4 +1,4 @@
 pkg
 tmp
 coverage
-spec/dummy/log
+spec/dummy/log/*.log

lib/status-page/configuration.rb

@@ -2,11 +2,12 @@ module StatusPage
   class Configuration
     PROVIDERS = [:cache, :database, :redis, :resque, :sidekiq].freeze
 
-    attr_accessor :error_callback, :basic_auth_credentials
+    attr_accessor :error_callback, :basic_auth_credentials, :interval
     attr_reader :providers
 
     def initialize
       @providers = Set.new
+      @interval = 10
     end
 
     def use(provider_name)

lib/status-page/monitor.rb

@@ -17,13 +17,21 @@ def configure
   end
 
   def check(request: nil)
+    if configuration.interval > 0
+      if @cached_status && @cached_status[:timestamp] >= (configuration.interval || 5).seconds.ago
+        return @cached_status
+      end
+    end
+
     providers = configuration.providers || []
     results = providers.map { |provider| provider_result(provider, request) }
 
-    {
+    @cached_status = {
       results: results,
-      status: results.all? { |result| result[:status] == STATUSES[:ok] } ? :ok : :service_unavailable
+      status: results.all? { |result| result[:status] == STATUSES[:ok] } ? :ok : :service_unavailable,
+      timestamp: Time.now
     }
+    @cached_status
   end
 
   private
@@ -35,17 +43,15 @@ def provider_result(provider, request)
     {
       name: provider.provider_name,
       message: '',
-      status: STATUSES[:ok],
-      timestamp: Time.now.to_s(:db)
+      status: STATUSES[:ok]
     }
   rescue => e
     configuration.error_callback.call(e) if configuration.error_callback
 
     {
       name: provider.provider_name,
       message: e.message,
-      status: STATUSES[:error],
-      timestamp: Time.now.to_s(:db)
+      status: STATUSES[:error]
     }
   end
 end

spec/controllers/status_page/status_controller_spec.rb

@@ -10,7 +10,9 @@
   before do
     providers = Set.new
     providers << StatusPage::Services::Database
+
     allow(StatusPage.configuration).to receive(:providers).and_return(providers)
+    allow(StatusPage.configuration).to receive(:interval).and_return(0)
 
     Timecop.freeze(time)
   end
@@ -45,8 +47,7 @@
         expect(json['results']).to eq([{
           'name' => 'database',
           'message' => '',
-          'status' => 'OK',
-          'timestamp' => time.to_s(:db)
+          'status' => 'OK'
         }])
       end
     end
@@ -87,8 +88,7 @@
       expect(json['results'][0]).to eq({
         'name' => 'database',
         'message' => '',
-        'status' => 'OK',
-        'timestamp' => time.to_s(:db)
+        'status' => 'OK'
       })
     end
 
@@ -109,8 +109,7 @@
         expect(json['results'][0]).to eq({
           'name' => 'database',
           'message' => 'Exception',
-          'status' => 'ERROR',
-          'timestamp' => time.to_s(:db)
+          'status' => 'ERROR'
         })
       end
     end