Merge pull request #4 from section/messagepack-array-prefix

Add messagepack array prefix so that multiple records will be processed.

lib/fluent/plugin/out_logtail.rb

@@ -38,11 +38,17 @@ def deliver(chunk, attempt)
         end
 
         http = build_http_client
-        body = chunk.read
+        records=0
+        chunk.each do
+          records=records+1
+        end
+        body = [0xdd,records].pack("CN")
+        body << chunk.read
 
         begin
           resp = http.start do |conn|
             req = build_request(body)
+            log.debug("sending #{req.body.length} bytes to logtail")
             conn.request(req)
           end
         ensure
@@ -51,6 +57,7 @@ def deliver(chunk, attempt)
 
         code = resp.code.to_i
         if code >= 200 && code <= 299
+          log.debug "POST request to logtail was responded to with status code #{code}"
           true
         elsif RETRYABLE_CODES.include?(code)
           sleep_time = sleep_for_attempt(attempt)

spec/fluent/plugin/out_logtail_spec.rb

@@ -31,7 +31,7 @@ def format(tag, time, record)
     it "should send a chunked request to the Logtail API" do
       stub = stub_request(:post, "https://in.logtail.com/").
         with(
-          :body => start_with("\x85\xA3age\x1A\xAArequest_id\xA242\xA9parent_id\xA6parent\xAArouting_id\xA7routing\xA2dt\xB4".force_encoding("ASCII-8BIT")),
+          :body => start_with("\xDD\x00\x00\x00\x01\x85\xA3age\x1A\xAArequest_id\xA242\xA9parent_id\xA6parent\xAArouting_id\xA7routing\xA2dt\xB4".force_encoding("ASCII-8BIT")),
           :headers => {'Accept'=>'*/*', 'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3', 'Authorization'=>'Bearer abcd1234', 'Content-Type'=>'application/msgpack', 'User-Agent'=>'Logtail Fluentd/0.1.1'}
         ).
         to_return(:status => 202, :body => "", :headers => {})