Update readme and log telemetry data

CHANGELOG.md

@@ -17,7 +17,7 @@ Data being sent:
 
 - Number of DAU (Daily Active Users)
 - App version
-- Instance ID
+- Instance ID (unique identifier of the Dawarich instance built by hashing the api key of the first user in the database)
 
 The data is being sent to a InfluxDB instance hosted by me and won't be shared with anyone.
 

app/jobs/telemetry_sending_job.rb

@@ -7,6 +7,7 @@ def perform
     return if ENV['DISABLE_TELEMETRY'] == 'true'
 
     data = Telemetry::Gather.new.call
+    Rails.logger.info("Telemetry data: #{data}")
 
     Telemetry::Send.new(data).call
   end

app/services/telemetry/send.rb

@@ -9,6 +9,8 @@ def initialize(payload)
   end
 
   def call
+    return if ENV['DISABLE_TELEMETRY'] == 'true'
+
     line_protocol = build_line_protocol
     response = send_request(line_protocol)
     handle_response(response)

spec/jobs/telemetry_sending_job_spec.rb

@@ -21,5 +21,17 @@
       expect(gather_service).to have_received(:call)
       expect(send_service).to have_received(:call)
     end
+
+    context 'when DISABLE_TELEMETRY is set to true' do
+      before do
+        stub_const('ENV', ENV.to_h.merge('DISABLE_TELEMETRY' => 'true'))
+      end
+
+      it 'does not send telemetry data' do
+        described_class.perform_now
+
+        expect(send_service).not_to have_received(:call)
+      end
+    end
   end
 end