all_flags_state is invalid if store isn't initialized (#182)

lib/ldclient-rb/ldclient.rb

@@ -338,6 +338,15 @@ def all_flags(user)
     def all_flags_state(user, options={})
       return FeatureFlagsState.new(false) if @config.offline?
 
+      if !initialized?
+        if @store.initialized?
+            @config.logger.warn { "Called all_flags_state before client initialization; using last known values from data store" }
+        else
+            @config.logger.warn { "Called all_flags_state before client initialization. Data store not available; returning empty state" }
+            return FeatureFlagsState.new(false)
+        end
+      end
+
       unless user && !user[:key].nil?
         @config.logger.error { "[LDClient] User and user key must be specified in all_flags_state" }
         return FeatureFlagsState.new(false)

spec/ldclient_evaluation_spec.rb

@@ -301,6 +301,22 @@ module LaunchDarkly
           expect(state.values_map).to eq({})
         end
       end
+
+      it "returns empty state if store is not initialize" do
+        wait = double
+        expect(wait).to receive(:wait).at_least(:once)
+
+        source = double
+        expect(source).to receive(:start).at_least(:once).and_return(wait)
+        expect(source).to receive(:stop).at_least(:once).and_return(wait)
+        expect(source).to receive(:initialized?).at_least(:once).and_return(false)
+        store = LaunchDarkly::InMemoryFeatureStore.new
+        with_client(test_config(store: store, data_source: source)) do |offline_client|
+          state = offline_client.all_flags_state({ key: 'userkey' })
+          expect(state.valid?).to be false
+          expect(state.values_map).to eq({})
+        end
+      end
     end
   end
 end