# frozen_string_literal: true

require_relative '../helper'

describe 'Network' do
  MemcachedManager.supported_protocols.each do |p|
    describe "using the #{p} protocol" do
      describe 'assuming a bad network' do
        it 'handle no server available' do
          dc = Dalli::Client.new 'localhost:19333'
          assert_error Dalli::RingError, /No server available/ do
            dc.get 'foo'
          end
        end

        describe 'with a fake server' do
          it 'handle connection reset' do
            memcached_mock(lambda(&:close)) do
              dc = Dalli::Client.new('localhost:19123')
              assert_error Dalli::RingError, /No server available/ do
                dc.get('abc')
              end
            end
          end

          it 'handle connection reset with unix socket' do
            socket_path = MemcachedMock::UNIX_SOCKET_PATH
            memcached_mock(lambda(&:close), :start_unix, socket_path) do
              dc = Dalli::Client.new(socket_path)
              assert_error Dalli::RingError, /No server available/ do
                dc.get('abc')
              end
            end
          end

          it 'handle malformed response' do
            memcached_mock(->(sock) { sock.write('123') }) do
              dc = Dalli::Client.new('localhost:19123')
              assert_error Dalli::RingError, /No server available/ do
                dc.get('abc')
              end
            end
          end

          it 'handle socket timeouts' do
            dc = Dalli::Client.new('localhost:19123', socket_timeout: 0)
            assert_raises Dalli::RingError do
              dc.get('abc')
            end
          end

          it 'handle connect timeouts' do
            memcached_mock(lambda { |sock|
                             sleep(0.6)
                             sock.close
                           }, :delayed_start) do
              dc = Dalli::Client.new('localhost:19123')
              assert_error Dalli::RingError, /No server available/ do
                dc.get('abc')
              end
            end
          end

          it 'handle read timeouts' do
            memcached_mock(lambda { |sock|
                             sleep(0.6)
                             sock.write('giraffe')
                           }) do
              dc = Dalli::Client.new('localhost:19123')
              assert_error Dalli::RingError, /No server available/ do
                dc.get('abc')
              end
            end
          end
        end

        it 'handles operation timeouts' do
          memcached_mock(lambda { |sock|
            # handle initial version call
            sock.gets
            sock.write("VERSION 1.6.0\r\n")

            sleep(0.3)
          }) do
            dc = Dalli::Client.new('localhost:19123', socket_timeout: 0.1, protocol: p, socket_max_failures: 0,
                                                      socket_failure_delay: 0.0, down_retry_delay: 0.0)
            # With socket_max_failures: 0, the first error triggers down! which raises NetworkError.
            # This NetworkError is not retried (only RetryableNetworkError is).
            assert_raises Dalli::NetworkError do
              dc.get('abc')
            end
          end
        end

        it 'does not retry NetworkError from down! with socket_max_failures: 0' do
          next if p == :binary

          memcached_mock(lambda { |sock|
            # handle initial version call
            sock.gets
            sock.write("VERSION 1.6.0\r\n")

            # handle the get request but never respond, causing timeout
            sock.gets
            sleep(0.3)
          }) do
            dc = Dalli::Client.new('localhost:19123', socket_timeout: 0.1, protocol: p, socket_max_failures: 0,
                                                      socket_failure_delay: 0.0, down_retry_delay: 0.0)
            # With socket_max_failures: 0, the first error triggers down! which raises NetworkError.
            # This NetworkError should NOT be caught and retried by perform (only RetryableNetworkError is).
            err = assert_raises Dalli::NetworkError do
              dc.get('abc')
            end
            assert_match(/is down/, err.message)
          end
        end

        it 'opens a standard TCP connection when ssl_context is not configured' do
          memcached_persistent(p) do |dc|
            server = dc.send(:ring).servers.first
            sock = Dalli::Socket::TCP.open(server.hostname, server.port, server.options)

            assert_instance_of Dalli::Socket::TCP, sock

            dc.set('abc', 123)

            assert_equal(123, dc.get('abc'))
          end
        end

        it 'opens a SSL TCP connection when there is an SSL context set' do
          memcached_ssl_persistent(p) do |dc|
            server = dc.send(:ring).servers.first
            sock = Dalli::Socket::TCP.open(server.hostname, server.port, server.options)

            assert_instance_of Dalli::Socket::SSLSocket, sock

            dc.set('abc', 123)

            assert_equal(123, dc.get('abc'))

            # Confirm that pipelined get works, since this depends on attributes on
            # the socket
            assert_equal({ 'abc' => 123 }, dc.get_multi(['abc']))
          end
        end

        it 'allow TCP connections to be configured for keepalive' do
          memcached_persistent(p) do |_, port|
            dc = Dalli::Client.new("localhost:#{port}", keepalive: true)
            dc.set(:a, 1)
            ring = dc.send(:ring)
            server = ring.servers.first
            socket = server.sock

            optval = socket.getsockopt(Socket::SOL_SOCKET, Socket::SO_KEEPALIVE)
            optval = optval.unpack 'i'

            refute_equal(optval[0], 0)
          end
        end

        it 'fails when SSL client connects to non-SSL server' do
          memcached_persistent(p) do |_, port|
            ssl_context = OpenSSL::SSL::SSLContext.new
            ssl_context.verify_mode = OpenSSL::SSL::VERIFY_NONE

            dc = Dalli::Client.new("localhost:#{port}", ssl_context: ssl_context)

            # SSL handshake fails when connecting to a non-SSL server
            assert_raises OpenSSL::SSL::SSLError do
              dc.get('abc')
            end
          end
        end

        it 'fails when SSL verification fails due to untrusted certificate' do
          memcached_ssl_persistent(p) do |_, port|
            # Create SSL context that does not trust the test CA
            strict_ssl_context = OpenSSL::SSL::SSLContext.new
            strict_ssl_context.verify_mode = OpenSSL::SSL::VERIFY_PEER
            # Don't set ca_file, so the self-signed cert won't be trusted

            dc = Dalli::Client.new("localhost:#{port}", ssl_context: strict_ssl_context)

            # SSL verification fails due to untrusted certificate
            assert_raises OpenSSL::SSL::SSLError do
              dc.get('abc')
            end
          end
        end
      end

      it 'handles timeout error during pipelined get' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            dc.send(:ring).server_for_key('abc').sock.stub(:write, proc { raise Timeout::Error }) do
              assert_empty dc.get_multi(['abc'])
            end
          end
        end
      end

      it 'handles SSL error during read operations' do
        # JRuby's socket classes don't support Minitest's stub method aliasing
        skip 'Minitest stub incompatible with JRuby sockets' if RUBY_ENGINE == 'jruby'

        with_nil_logger do
          memcached(p, 19_191) do |dc|
            # First set a value so we have something to get
            dc.set('ssl_test_key', 'test_value')

            server = dc.send(:ring).server_for_key('ssl_test_key')

            # Stub error_on_request! to verify SSLError triggers error handling
            # This confirms the SSL error is caught by the rescue clause
            error_handled = false
            original_error_on_request = server.instance_variable_get(:@connection_manager).method(:error_on_request!)

            server.instance_variable_get(:@connection_manager).define_singleton_method(:error_on_request!) do |err|
              error_handled = true if err.is_a?(OpenSSL::SSL::SSLError)
              original_error_on_request.call(err)
            end

            ssl_error = OpenSSL::SSL::SSLError.new('SSL_read: unexpected eof while reading')

            server.sock.stub(:gets, proc { raise ssl_error }) do
              # The operation will retry with a new connection and may succeed
              # What matters is the SSLError is caught, not propagated
              dc.get('ssl_test_key')
            rescue Dalli::NetworkError
              # Expected if retries exhausted
            end

            assert error_handled, 'SSLError should trigger error_on_request!'
          end
        end
      end

      it 'handles SSL error during pipelined get' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            ssl_error = OpenSSL::SSL::SSLError.new('SSL_read: unexpected eof while reading')

            dc.send(:ring).server_for_key('abc').sock.stub(:write, proc { raise ssl_error }) do
              assert_empty dc.get_multi(['abc'])
            end
          end
        end
      end

      it 'handles closed socket with IOError' do
        with_nil_logger do
          memcached_persistent(p) do |dc|
            dc.set('test_key', 'test_value')

            # Force close the socket to simulate IOError: closed stream
            server = dc.instance_variable_get(:@ring).servers.first
            socket = server.instance_variable_get(:@connection_manager).sock
            socket&.close

            # Should recover by reconnecting and return the cached value
            assert_equal 'test_value', dc.get('test_key')
          end
        end
      end

      it 'handles asynchronous Thread#raise' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            10.times do |i|
              # Pre-set the key so we're testing Thread#raise handling,
              # not whether the set completed before interruption
              dc.set("key:#{i}", i.to_s)

              thread = Thread.new do
                loop do
                  assert_instance_of Integer, dc.set("key:#{i}", i.to_s)
                end
              rescue RuntimeError
                nil # expected
              end
              thread.join(rand(0.01..0.2))

              thread.raise('Test Timeout Error')
              joined_thread = thread.join(1)

              refute_nil joined_thread
              refute_predicate joined_thread, :alive?
              # Verify the connection is still usable after Thread#raise
              assert_equal i.to_s, dc.get("key:#{i}")
            end
          end
        end
      end

      it 'handles asynchronous Thread#raise during pipelined get' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            10.times do |i|
              expected_response = 100.times.to_h { |x| ["key:#{i}:#{x}", x.to_s] }
              expected_response.each do |key, val|
                dc.set(key, val)
              end

              thread = Thread.new do
                loop do
                  assert_equal expected_response, dc.get_multi(expected_response.keys)
                end
              rescue RuntimeError
                nil # expected
              end
              thread.join(rand(0.01..0.2))

              thread.raise('Test Timeout Error')
              joined_thread = thread.join(1)

              refute_nil joined_thread
              refute_predicate joined_thread, :alive?
              assert_equal expected_response, dc.get_multi(expected_response.keys)
            end
          end
        end
      end

      it 'handles asynchronous Thread#kill' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            10.times do |i|
              thread = Thread.new do
                loop do
                  assert_instance_of Integer, dc.set("key:#{i}", i.to_s)
                end
              rescue RuntimeError
                nil # expected
              end
              thread.join(rand(0.01..0.2))

              thread.kill
              joined_thread = thread.join(1)

              refute_nil joined_thread
              refute_predicate joined_thread, :alive?
              assert_equal i.to_s, dc.get("key:#{i}")
            end
          end
        end
      end

      it 'handles asynchronous Thread#kill during pipelined get' do
        with_nil_logger do
          memcached(p, 19_191) do |dc|
            10.times do |i|
              expected_response = 100.times.to_h { |x| ["key:#{i}:#{x}", x.to_s] }
              expected_response.each do |key, val|
                dc.set(key, val)
              end

              thread = Thread.new do
                loop do
                  assert_equal expected_response, dc.get_multi(expected_response.keys)
                end
              rescue RuntimeError
                nil # expected
              end
              thread.join(rand(0.01..0.2))

              thread.kill
              joined_thread = thread.join(1)

              refute_nil joined_thread
              refute_predicate joined_thread, :alive?
              assert_equal expected_response, dc.get_multi(expected_response.keys)
            end
          end
        end
      end

      it 'passes a simple smoke test on a TCP socket' do
        memcached_persistent(p) do |dc, port|
          resp = dc.flush

          refute_nil resp
          assert_equal [true, true], resp

          assert op_addset_succeeds(dc.set(:foo, 'bar'))
          assert_equal 'bar', dc.get(:foo)

          resp = dc.get('123')

          assert_nil resp

          assert op_addset_succeeds(dc.set('123', 'xyz'))

          resp = dc.get('123')

          assert_equal 'xyz', resp

          assert op_addset_succeeds(dc.set('123', 'abc'))

          dc.prepend('123', '0')
          dc.append('123', '0')

          assert_raises Dalli::UnmarshalError do
            resp = dc.get('123')
          end

          dc.close
          dc = nil

          dc = Dalli::Client.new("localhost:#{port}", digest_class: OpenSSL::Digest::SHA1)

          assert op_addset_succeeds(dc.set('456', 'xyz', 0, raw: true))

          resp = dc.prepend '456', '0'

          assert resp

          resp = dc.append '456', '9'

          assert resp

          resp = dc.get('456', raw: true)

          assert_equal '0xyz9', resp

          assert op_addset_succeeds(dc.set('456', false))

          resp = dc.get('456')

          refute resp

          resp = dc.stats

          assert_instance_of Hash, resp

          dc.close
        end
      end

      it 'passes a simple smoke test on unix socket' do
        memcached_persistent(:meta, MemcachedMock::UNIX_SOCKET_PATH) do |dc, path|
          resp = dc.flush

          refute_nil resp
          assert_equal [true], resp

          assert op_addset_succeeds(dc.set(:foo, 'bar'))
          assert_equal 'bar', dc.get(:foo)

          resp = dc.get('123')

          assert_nil resp

          assert op_addset_succeeds(dc.set('123', 'xyz'))

          resp = dc.get('123')

          assert_equal 'xyz', resp

          assert op_addset_succeeds(dc.set('123', 'abc'))

          dc.prepend('123', '0')
          dc.append('123', '0')

          assert_raises Dalli::UnmarshalError do
            resp = dc.get('123')
          end

          dc.close
          dc = nil

          dc = Dalli::Client.new(path)

          assert op_addset_succeeds(dc.set('456', 'xyz', 0, raw: true))

          resp = dc.prepend '456', '0'

          assert resp

          resp = dc.append '456', '9'

          assert resp

          resp = dc.get('456', raw: true)

          assert_equal '0xyz9', resp

          assert op_addset_succeeds(dc.set('456', false))

          resp = dc.get('456')

          refute resp

          resp = dc.stats

          assert_instance_of Hash, resp

          dc.close
        end
      end
    end
  end

  if MemcachedManager.supported_protocols.include?(:meta)
    describe 'ServerError' do
      it 'is raised when Memcached response with a SERVER_ERROR' do
        memcached_mock(->(sock) { sock.write("SERVER_ERROR foo bar\r\n") }) do
          dc = Dalli::Client.new('localhost:19123', protocol: :meta)
          err = assert_raises Dalli::ServerError do
            dc.get('abc')
          end

          assert_equal 'SERVER_ERROR foo bar', err.message
        end
      end
    end
  end
end
