switch from deflate to gzip

Author: PetrHeinz

lib/logtail/log_devices/http.rb

@@ -206,10 +206,14 @@ def build_request(msgs)
           req = Net::HTTP::Post.new(path)
           req['Authorization'] = authorization_payload
           req['Content-Type'] = CONTENT_TYPE
-          req['Content-Encoding'] = 'deflate'
+          req['Content-Encoding'] = 'gzip'
           req['User-Agent'] = USER_AGENT
           uncompressed = msgs.map { |msg| force_utf8_encoding(msg.to_hash) }.to_msgpack
-          req.body = Zlib::Deflate.deflate(uncompressed, Zlib::BEST_SPEED)
+          string_io = StringIO.new
+          Zlib::GzipWriter.wrap(string_io) do |gz|
+            gz.write(uncompressed)
+          end
+          req.body = string_io.string
           req
         end
 

spec/logtail/log_devices/http_spec.rb

@@ -102,7 +102,7 @@
       request_queue = http.instance_variable_get(:@request_queue)
       request_attempt = request_queue.deq
       expect(request_attempt.request).to be_kind_of(Net::HTTP::Post)
-      decompressed_body = Zlib::Inflate.inflate(request_attempt.request.body)
+      decompressed_body = Zlib::GzipReader.new(StringIO.new(request_attempt.request.body)).read
       expect(decompressed_body).to start_with("\x92\x84\xA5level\xA4INFO\xA2dt\xBB2016-09-01T12:00:00.000000Z\xA7message\xB2test log message 1".force_encoding("ASCII-8BIT"))
 
       message_queue = http.instance_variable_get(:@msg_queue)
@@ -128,7 +128,7 @@
     it "should deliver requests on an interval" do
       stub = stub_request(:post, "https://in.logs.betterstack.com/").
         with do |request|
-        decompressed_body = Zlib::Inflate.inflate(request.body)
+        decompressed_body = Zlib::GzipReader.new(StringIO.new(request.body)).read
         expect(decompressed_body).to start_with("\x92\x84\xA5level\xA4INFO\xA2dt\xBB2016-09-01T12:00:00.000000Z\xA7message\xB2test log message 1".force_encoding("ASCII-8BIT"))
 
         expect(request.headers['Authorization']).to eq('Bearer MYKEY')