Add some useful information to PG::Connection#inspect

.. instead of the useless instance variable.

lib/pg/connection.rb

@@ -93,6 +93,27 @@ class PG::Connection
 		return connect_hash_to_string(iopts)
 	end
 
+	# Return a String representation of the object suitable for debugging.
+	def inspect
+		str = self.to_s
+		str[-1,0] = if finished?
+			" finished"
+		else
+			stats = []
+			stats << " status=#{ PG.constants.grep(/CONNECTION_/).find{|c| PG.const_get(c) == status} }" if status != CONNECTION_OK
+			stats << " transaction_status=#{ PG.constants.grep(/PQTRANS_/).find{|c| PG.const_get(c) == transaction_status} }" if transaction_status != PG::PQTRANS_IDLE
+			stats << " nonblocking=#{ isnonblocking }" if isnonblocking
+			stats << " pipeline_status=#{ PG.constants.grep(/PQ_PIPELINE_/).find{|c| PG.const_get(c) == pipeline_status} }" if respond_to?(:pipeline_status) && pipeline_status != PG::PQ_PIPELINE_OFF
+			stats << " client_encoding=#{ get_client_encoding }" if get_client_encoding != "UTF8"
+			stats << " type_map_for_results=#{ type_map_for_results.to_s }" unless type_map_for_results.is_a?(PG::TypeMapAllStrings)
+			stats << " type_map_for_queries=#{ type_map_for_queries.to_s }" unless type_map_for_queries.is_a?(PG::TypeMapAllStrings)
+			stats << " encoder_for_put_copy_data=#{ encoder_for_put_copy_data.to_s }" if encoder_for_put_copy_data
+			stats << " decoder_for_get_copy_data=#{ decoder_for_get_copy_data.to_s }" if decoder_for_get_copy_data
+			" host=#{host} port=#{port} user=#{user}#{stats.join}"
+		end
+		return str
+	end
+
 	#  call-seq:
 	#     conn.copy_data( sql [, coder] ) {|sql_result| ... } -> PG::Result
 	#

spec/helpers.rb

@@ -46,6 +46,7 @@ module PG::TestingHelpers
 
 			mod.around( :each ) do |example|
 				begin
+					@conn.set_client_encoding "UTF8"
 					@conn.set_default_encoding
 					@conn.exec( 'BEGIN' ) unless example.metadata[:without_transaction]
 					desc = example.source_location.join(':')
@@ -64,6 +65,11 @@ module PG::TestingHelpers
 						end
 						@conn.exit_pipeline_mode
 					end
+					@conn.setnonblocking false
+					@conn.type_map_for_results = PG::TypeMapAllStrings.new
+					@conn.type_map_for_queries = PG::TypeMapAllStrings.new
+					@conn.encoder_for_put_copy_data = nil
+					@conn.decoder_for_get_copy_data = nil
 					@conn.exec( 'ROLLBACK' ) unless example.metadata[:without_transaction]
 				end
 			end

spec/pg/connection_spec.rb

@@ -14,6 +14,63 @@ describe PG::Connection do
 		expect( ObjectSpace.memsize_of(@conn) ).to be > DATA_OBJ_MEMSIZE
 	end
 
+	describe "#inspect", :without_transaction do
+		it "should print host, port and user of a fresh connection, but not more" do
+			expect( @conn.inspect ).to match(/<PG::Connection:[0-9a-fx]+ host=localhost port=#{@port} user=\w*>/)
+		end
+
+		it "should tell about finished connection" do
+			conn = PG.connect(@conninfo)
+			conn.finish
+			expect( conn.inspect ).to match(/<PG::Connection:[0-9a-fx]+ finished>/)
+		end
+
+		it "should tell about connection status" do
+			conn = PG::Connection.connect_start(@conninfo)
+			expect( conn.inspect ).to match(/ status=CONNECTION_STARTED/)
+		end
+
+		it "should tell about pipeline mode", :postgresql_14 do
+			@conn.enter_pipeline_mode
+			expect( @conn.inspect ).to match(/ pipeline_status=PQ_PIPELINE_ON/)
+		end
+
+		it "should tell about transaction_status" do
+			@conn.send_query "select 8"
+			expect( @conn.inspect ).to match(/ transaction_status=PQTRANS_ACTIVE/)
+		end
+
+		it "should tell about nonblocking mode" do
+			@conn.setnonblocking true
+			expect( @conn.inspect ).to match(/ nonblocking=true/)
+		end
+
+		it "should tell about non UTF8 client encoding" do
+			@conn.set_client_encoding "ISO-8859-1"
+			expect( @conn.inspect ).to match(/ client_encoding=LATIN1/)
+		end
+
+		it "should tell about non default type_map_for_results" do
+			@conn.type_map_for_results = PG::TypeMapByColumn.new([])
+			expect( @conn.inspect ).to match(/ type_map_for_results=#<PG::TypeMapByColumn:[0-9a-fx]+>/)
+		end
+
+		it "should tell about non default type_map_for_queries" do
+			@conn.type_map_for_queries = PG::TypeMapByColumn.new([])
+			expect( @conn.inspect ).to match(/ type_map_for_queries=#<PG::TypeMapByColumn:[0-9a-fx]+>/)
+		end
+
+		it "should tell about encoder_for_put_copy_data" do
+			@conn.encoder_for_put_copy_data = PG::TextEncoder::CopyRow.new
+			expect( @conn.inspect ).to match(/ encoder_for_put_copy_data=#<PG::TextEncoder::CopyRow:[0-9a-fx]+>/)
+		end
+
+		it "should tell about decoder_for_get_copy_data" do
+			@conn.decoder_for_get_copy_data = PG::TextDecoder::CopyRow.new
+			expect( @conn.inspect ).to match(/ decoder_for_get_copy_data=#<PG::TextDecoder::CopyRow:[0-9a-fx]+>/)
+		end
+	end
+
 	describe "PG::Connection#conninfo_parse" do
 		it "encode and decode Hash to connection string to Hash" do
 			hash = {