Fix request data logging for httprb/http version 4

.gitignore

@@ -3,4 +3,5 @@
 pkg/
 *.gem
 coverage/
-spec/log/*.log
+spec/log/*.log
+gemfiles/*.lock

.travis.yml

@@ -3,6 +3,10 @@ rvm:
   - "2.2.8"
   - "2.3.5"
   - "2.4.2"
+gemfile:
+  - gemfiles/http2.gemfile
+  - gemfiles/http3.gemfile
+  - gemfiles/http4.gemfile
 # uncomment this line if your project needs to run something other than `rake`:
 script: bundle exec rspec spec
 # workaround for https://github.com/travis-ci/travis-ci/issues/5239:

gemfiles/http2.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "http", "~> 2.0"
+
+gemspec path: ".."

gemfiles/http3.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "http", "~> 3.0"
+
+gemspec path: ".."

gemfiles/http4.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "http", github: "httprb/http"
+
+gemspec path: ".."

lib/httplog/adapters/http.rb

@@ -14,7 +14,15 @@ class Client
         if log_enabled
           HttpLog.log_request(req.verb, req.uri)
           HttpLog.log_headers(req.headers.to_h)
-          HttpLog.log_data(req.body) #if req.verb == :post
+
+          if defined?(::HTTP::Request::Body)
+            body = req.body.respond_to?(:source) ? req.body.source : req.body.instance_variable_get(:@body)
+          else
+            body = req.body
+          end
+
+          HttpLog.log_data(body.to_s)
+          body.rewind if body.respond_to?(:rewind)
         end
 
         bm = Benchmark.realtime do