Formatting the log using parameter progname for the logger

lib/faraday/logging/formatter.rb

@@ -23,16 +23,16 @@ def initialize(logger:, options:)
       def_delegators :@logger, :debug, :info, :warn, :error, :fatal
 
       def request(env)
-        public_send(log_level, 'request') do
-          "#{env.method.upcase} #{apply_filters(env.url.to_s)}"
+        public_send(log_level) do
+          "request: #{env.method.upcase} #{apply_filters(env.url.to_s)}"
         end
 
         log_headers('request', env.request_headers) if log_headers?(:request)
         log_body('request', env[:body]) if env[:body] && log_body?(:request)
       end
 
       def response(env)
-        public_send(log_level, 'response') { "Status #{env.status}" }
+        public_send(log_level) { "response: Status #{env.status}" }
 
         log_headers('response', env.response_headers) if log_headers?(:response)
         log_body('response', env[:body]) if env[:body] && log_body?(:response)
@@ -41,7 +41,7 @@ def response(env)
       def exception(exc)
         return unless log_errors?
 
-        public_send(log_level, 'error') { exc.full_message }
+        public_send(log_level) { "error: #{exc.full_message}" }
 
         log_headers('error', exc.response_headers) if exc.respond_to?(:response_headers) && log_headers?(:error)
         return unless exc.respond_to?(:response_body) && exc.response_body && log_body?(:error)
@@ -107,11 +107,11 @@ def log_level
       end
 
       def log_headers(type, headers)
-        public_send(log_level, type) { apply_filters(dump_headers(headers)) }
+        public_send(log_level) { "#{type}: #{apply_filters(dump_headers(headers))}" }
       end
 
       def log_body(type, body)
-        public_send(log_level, type) { apply_filters(dump_body(body)) }
+        public_send(log_level) { "#{type}: #{apply_filters(dump_body(body))}" }
       end
     end
   end

spec/faraday/response/logger_spec.rb

@@ -55,6 +55,26 @@
     end
   end
 
+  context 'when logger with program name' do
+    let(:logger) { Logger.new(string_io, progname: 'my_best_program') }
+
+    it 'logs with program name' do
+      conn.get '/hello'
+
+      expect(string_io.string).to match('-- my_best_program: request:')
+      expect(string_io.string).to match('-- my_best_program: response:')
+    end
+  end
+
+  context 'when logger without program name' do
+    it 'logs without program name' do
+      conn.get '/hello'
+
+      expect(string_io.string).to match('-- : request:')
+      expect(string_io.string).to match('-- : response:')
+    end
+  end
+
   context 'with default formatter' do
     let(:formatter) { instance_double(Faraday::Logging::Formatter, request: true, response: true, filter: []) }