text: /*
   * Copyright 2015 Cloudius Systems
   */
  
  #include <seastar/http/httpd.hh>
  #include <seastar/http/handlers.hh>
  #include <seastar/http/matcher.hh>
  #include <seastar/http/matchrules.hh>
  #include <seastar/json/formatter.hh>
  #include <seastar/http/routes.hh>
  #include <seastar/http/exception.hh>
  #include <seastar/http/transformers.hh>
  #include <seastar/core/future-util.hh>
  #include <seastar/testing/test_case.hh>
  #include "loopback_socket.hh"
  #include <boost/algorithm/string.hpp>
  #include <seastar/core/thread.hh>
  #include <seastar/util/noncopyable_function.hh>
  #include <seastar/http/json_path.hh>
  #include <sstream>
  
  using namespace seastar;
  using namespace httpd;
  
  class handl : public httpd::handler_base {
  public:
      virtual future<std::unique_ptr<reply> > handle(const sstring& path,
              std::unique_ptr<request> req, std::unique_ptr<reply> rep) {
          rep->done("html");
          return make_ready_future<std::unique_ptr<reply>>(std::move(rep));
      }
  };
  
  SEASTAR_TEST_CASE(test_reply)
  {
      reply r;
      r.set_content_type("txt");
      BOOST_REQUIRE_EQUAL(r._headers["Content-Type"], sstring("text/plain"));
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_str_matcher)
  {
  
      str_matcher m("/hello");
      parameters param;
      BOOST_REQUIRE_EQUAL(m.match("/abc/hello", 4, param), 10u);
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_param_matcher)
  {
  
      param_matcher m("param");
      parameters param;
      BOOST_REQUIRE_EQUAL(m.match("/abc/hello", 4, param), 10u);
      BOOST_REQUIRE_EQUAL(param.path("param"), "/hello");
      BOOST_REQUIRE_EQUAL(param["param"], "hello");
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_match_rule)
  {
  
      parameters param;
      handl* h = new handl();
      match_rule mr(h);
      mr.add_str("/hello").add_param("param");
      httpd::handler_base* res = mr.get("/hello/val1", param);
      BOOST_REQUIRE_EQUAL(res, h);
      BOOST_REQUIRE_EQUAL(param["param"], "val1");
      res = mr.get("/hell/val1", param);
      httpd::handler_base* nl = nullptr;
      BOOST_REQUIRE_EQUAL(res, nl);
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_match_rule_order)
  {
      parameters param;
      routes route;
  
      handl* h1 = new handl();
      route.add(operation_type::GET, url("/hello"), h1);
  
      handl* h2 = new handl();
      route.add(operation_type::GET, url("/hello"), h2);
  
      auto rh = route.get_handler(GET, "/hello", param);
      BOOST_REQUIRE_EQUAL(rh, h1);
  
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_put_drop_rule)
  {
      routes rts;
      auto h = std::make_unique<handl>();
      parameters params;
  
      {
          auto reg = handler_registration(rts, *h, "/hello", operation_type::GET);
          auto res = rts.get_handler(operation_type::GET, "/hello", params);
          BOOST_REQUIRE_EQUAL(res, h.get());
      }
  
      auto res = rts.get_handler(operation_type::GET, "/hello", params);
      httpd::handler_base* nl = nullptr;
      BOOST_REQUIRE_EQUAL(res, nl);
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_add_del_cookie)
  {
      routes rts;
      handl* h = new handl();
      match_rule mr(h);
      mr.add_str("/hello");
      parameters params;
  
      {
          auto reg = rule_registration(rts, mr, operation_type::GET);
          auto res = rts.get_handler(operation_type::GET, "/hello", params);
          BOOST_REQUIRE_EQUAL(res, h);
      }
  
      auto res = rts.get_handler(operation_type::GET, "/hello", params);
      httpd::handler_base* nl = nullptr;
      BOOST_REQUIRE_EQUAL(res, nl);
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_formatter)
  {
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(true), "true");
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(false), "false");
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(1), "1");
      const char* txt = "efg";
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(txt), "\"efg\"");
      sstring str = "abc";
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(str), "\"abc\"");
      float f = 1;
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(f), "1");
      f = 1.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(f), std::out_of_range);
      f = -1.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(f), std::out_of_range);
      f = 0.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(f), std::invalid_argument);
      double d = -1;
      BOOST_REQUIRE_EQUAL(json::formatter::to_json(d), "-1");
      d = 1.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(d), std::out_of_range);
      d = -1.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(d), std::out_of_range);
      d = 0.0/0.0;
      BOOST_CHECK_THROW(json::formatter::to_json(d), std::invalid_argument);
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_decode_url) {
      request req;
      req._url = "/a?q=%23%24%23";
      sstring url = http_server::connection::set_query_param(req);
      BOOST_REQUIRE_EQUAL(url, "/a");
      BOOST_REQUIRE_EQUAL(req.get_query_param("q"), "#$#");
      req._url = "/a?a=%23%24%23&b=%22%26%22";
      http_server::connection::set_query_param(req);
      BOOST_REQUIRE_EQUAL(req.get_query_param("a"), "#$#");
      BOOST_REQUIRE_EQUAL(req.get_query_param("b"), "\"&\"");
      return make_ready_future<>();
  }
  
  SEASTAR_TEST_CASE(test_routes) {
      handl* h1 = new handl();
      handl* h2 = new handl();
      routes route;
      route.add(operation_type::GET, url("/api").remainder("path"), h1);
      route.add(operation_type::GET, url("/"), h2);
      std::unique_ptr<request> req = std::make_unique<request>();
      std::unique_ptr<reply> rep = std::make_unique<reply>();
  
      auto f1 =
              route.handle("/api", std::move(req), std::move(rep)).then(
                      [] (std::unique_ptr<reply> rep) {
                          BOOST_REQUIRE_EQUAL((int )rep->_status, (int )reply::status_type::ok);
                      });
      req.reset(new request);
      rep.reset(new reply);
  
      auto f2 =
              route.handle("/", std::move(req), std::move(rep)).then(
                      [] (std::unique_ptr<reply> rep) {
                          BOOST_REQUIRE_EQUAL((int )rep->_status, (int )reply::status_type::ok);
                      });
      req.reset(new request);
      rep.reset(new reply);
      auto f3 =
              route.handle("/api/abc", std::move(req), std::move(rep)).then(
                      [] (std::unique_ptr<reply> rep) {
                      });
      req.reset(new request);
      rep.reset(new reply);
      auto f4 =
              route.handle("/ap", std::move(req), std::move(rep)).then(
                      [] (std::unique_ptr<reply> rep) {
                          BOOST_REQUIRE_EQUAL((int )rep->_status,
                                              (int )reply::status_type::not_found);
                      });
      return when_all(std::move(f1), std::move(f2), std::move(f3), std::move(f4))
              .then([] (std::tuple<future<>, future<>, future<>, future<>> fs) {
          std::get<0>(fs).get();
          std::get<1>(fs).get();
          std::get<2>(fs).get();
          std::get<3>(fs).get();
      });
  }
  
  SEASTAR_TEST_CASE(test_json_path) {
      shared_ptr<bool> res1 = make_shared<bool>(false);
      shared_ptr<bool> res2 = make_shared<bool>(false);
      shared_ptr<bool> res3 = make_shared<bool>(false);
      shared_ptr<routes> route = make_shared<routes>();
      path_description path1("/my/path",GET,"path1",
          {{"param1", path_description::url_component_type::PARAM}
          ,{"/text", path_description::url_component_type::FIXED_STRING}},{});
      path_description path2("/my/path",GET,"path2",
              {{"param1", path_description::url_component_type::PARAM}
              ,{"param2", path_description::url_component_type::PARAM}},{});
      path_description path3("/my/path",GET,"path3",
              {{"param1", path_description::url_component_type::PARAM}
              ,{"param2", path_description::url_component_type::PARAM_UNTIL_END_OF_PATH}},{});
  
      path1.set(*route, [res1] (const_req req) {
          (*res1) = true;
          BOOST_REQUIRE_EQUAL(req.param["param1"], "value1");
          return "";
      });
  
      path2.set(*route, [res2] (const_req req) {
          (*res2) = true;
          BOOST_REQUIRE_EQUAL(req.param["param1"], "value2");
          BOOST_REQUIRE_EQUAL(req.param["param2"], "text1");
          return "";
      });
  
      path3.set(*route, [res3] (const_req req) {
          (*res3) = true;
          BOOST_REQUIRE_EQUAL(req.param["param1"], "value3");
          BOOST_REQUIRE_EQUAL(req.param["param2"], "text2/text3");
          return "";
      });
  
      auto f1 = route->handle("/my/path/value1/text", std::make_unique<request>(), std::make_unique<reply>()).then([res1, route] (auto f) {
          BOOST_REQUIRE_EQUAL(*res1, true);
      });
  
      auto f2 = route->handle("/my/path/value2/text1", std::make_unique<request>(), std::make_unique<reply>()).then([res2, route] (auto f) {
          BOOST_REQUIRE_EQUAL(*res2, true);
      });
  
      auto f3 = route->handle("/my/path/value3/text2/text3", std::make_unique<request>(), std::make_unique<reply>()).then([res3, route] (auto f) {
          BOOST_REQUIRE_EQUAL(*res3, true);
      });
  
      return when_all(std::move(f1), std::move(f2), std::move(f3))
                  .then([] (std::tuple<future<>, future<>, future<>> fs) {
              std::get<0>(fs).get();
              std::get<1>(fs).get();
              std::get<2>(fs).get();
      });
  }
  
  /*!
   * \brief a helper data sink that stores everything it gets in a stringstream
   */
  class memory_data_sink_impl : public data_sink_impl {
      std::stringstream& _ss;
  public:
      memory_data_sink_impl(std::stringstream& ss) : _ss(ss) {
      }
      virtual future<> put(net::packet data)  override {
          abort();
          return make_ready_future<>();
      }
      virtual future<> put(temporary_buffer<char> buf) override {
          _ss.write(buf.get(), buf.size());
          return make_ready_future<>();
      }
      virtual future<> flush() override {
          return make_ready_future<>();
      }
  
      virtual future<> close() override {
          return make_ready_future<>();
      }
  };
  
  class memory_data_sink : public data_sink {
  public:
      memory_data_sink(std::stringstream& ss)
          : data_sink(std::make_unique<memory_data_sink_impl>(ss)) {}
  };
  
  future<> test_transformer_stream(std::stringstream& ss, content_replace& cr, std::vector<sstring>&& buffer_parts) {
      std::unique_ptr<seastar::httpd::request> req = std::make_unique<seastar::httpd::request>();
      ss.str("");
      req->_headers["Host"] = "localhost";
      return do_with(output_stream<char>(cr.transform(std::move(req), "json", output_stream<char>(memory_data_sink(ss), 32000, true))),
              std::vector<sstring>(std::move(buffer_parts)), [] (output_stream<char>& os, std::vector<sstring>& parts) {
          return do_for_each(parts, [&os](auto& p) {
              return os.write(p);
          }).then([&os] {
              return os.close();
          });
      });
  }
  
  SEASTAR_TEST_CASE(test_transformer) {
      return do_with(std::stringstream(), content_replace("json"), [] (std::stringstream& ss, content_replace& cr) {
          return do_with(output_stream<char>(cr.transform(std::make_unique<seastar::httpd::request>(), "html", output_stream<char>(memory_data_sink(ss), 32000, true))),
                  [] (output_stream<char>& os) {
              return os.write(sstring("hello-{{Protocol}}-xyz-{{Host}}")).then([&os] {
                  return os.close();
              });
          }).then([&ss, &cr] () {
              BOOST_REQUIRE_EQUAL(ss.str(), "hello-{{Protocol}}-xyz-{{Host}}");
              return test_transformer_stream(ss, cr, {"hell", "o-{", "{Pro", "tocol}}-xyz-{{Ho", "st}}{{Pr"}).then([&ss, &cr] {
                  BOOST_REQUIRE_EQUAL(ss.str(), "hello-http-xyz-localhost{{Pr");
                  return test_transformer_stream(ss, cr, {"hell", "o-{{", "Pro", "tocol}}{{Protocol}}-{{Protoxyz-{{Ho", "st}}{{Pr"}).then([&ss, &cr] {
                      BOOST_REQUIRE_EQUAL(ss.str(), "hello-httphttp-{{Protoxyz-localhost{{Pr");
                      return test_transformer_stream(ss, cr, {"hell", "o-{{Pro", "t{{Protocol}}ocol}}", "{{Host}}"}).then([&ss] {
                          BOOST_REQUIRE_EQUAL(ss.str(), "hello-{{Prothttpocol}}localhost");
                      });
                  });
              });
          });
      });
  }
  
  struct http_consumer {
      std::map<sstring, std::string> _headers;
      std::string _body;
      uint32_t _remain = 0;
      std::string _current;
      char last = '\0';
      uint32_t _size = 0;
      bool _concat = true;
  
      enum class status_type {
          READING_HEADERS,
          CHUNK_SIZE,
          CHUNK_BODY,
          CHUNK_END,
          READING_BODY_BY_SIZE,
          DONE
      };
      status_type status = status_type::READING_HEADERS;
  
      bool read(const temporary_buffer<char>& b) {
          for (auto c : b) {
              if (last =='\r' && c == '\n') {
                  if (_current == "") {
                      if (status == status_type::READING_HEADERS || (status == status_type::CHUNK_BODY && _remain == 0)) {
                          if (status == status_type::READING_HEADERS && _headers.find("Content-Length") != _headers.end()) {
                              _remain = stoi(_headers["Content-Length"], nullptr, 16);
                              if (_remain == 0) {
                                  status = status_type::DONE;
                                  break;
                              }
                              status = status_type::READING_BODY_BY_SIZE;
                          } else {
                              status = status_type::CHUNK_SIZE;
                          }
                      } else if (status == status_type::CHUNK_END) {
                          status = status_type::DONE;
                          break;
                      }
                  } else {
                      switch (status) {
                      case status_type::READING_HEADERS: add_header(_current);
                      break;
                      case status_type::CHUNK_SIZE: set_chunk(_current);
                      break;
                      default:
                          break;
                      }
                      _current = "";
                  }
                  last = '\0';
              } else {
                  if (last != '\0') {
                      if (status == status_type::CHUNK_BODY || status == status_type::READING_BODY_BY_SIZE) {
                          if (_concat) {
                              _body = _body + last;
                          }
                          _size++;
                          _remain--;
                          if (_remain <= 1 && status == status_type::READING_BODY_BY_SIZE) {
                              if (_concat) {
                                  _body = _body + c;
                              }
                              _size++;
                              status = status_type::DONE;
                              break;
                          }
                      } else {
                          _current = _current + last;
                      }
  
                  }
                  last = c;
              }
          }
          return status == status_type::DONE;
      }
  
      void set_chunk(const std::string& s) {
          _remain = stoi(s, nullptr, 16);
          if (_remain == 0) {
              status = status_type::CHUNK_END;
          } else {
              status = status_type::CHUNK_BODY;
          }
      }
  
      void add_header(const std::string& s) {
          std::vector<std::string> strs;
          boost::split(strs, s, boost::is_any_of(":"));
          if (strs.size() > 1) {
              _headers[strs[0]] = strs[1];
          }
      }
  };
  
  class test_client_server {
  public:
      static future<> write_request(output_stream<char>& output) {
          return output.write(sstring("GET /test HTTP/1.1\r\nHost: myhost.org\r\n\r\n")).then([&output]{
                  return output.flush();
          });
      }
  
      static future<> run_test(std::function<future<>(output_stream<char> &&)>&& write_func, std::function<bool(size_t, http_consumer&)> reader) {
          return do_with(loopback_connection_factory(), foreign_ptr<shared_ptr<http_server>>(make_shared<http_server>("test")),
                  [reader, &write_func] (loopback_connection_factory& lcf, auto& server) {
              return do_with(loopback_socket_impl(lcf), [&server, &lcf, reader, &write_func](loopback_socket_impl& lsi) {
                  httpd::http_server_tester::listeners(*server).emplace_back(lcf.get_server_socket());
  
                  auto client = seastar::async([&lsi, reader] {
                      connected_socket c_socket = std::get<connected_socket>(lsi.connect(socket_address(ipv4_addr()), socket_address(ipv4_addr())).get());
                      input_stream<char> input(c_socket.input());
                      output_stream<char> output(c_socket.output());
                      bool more = true;
                      size_t count = 0;
                      while (more) {
                          http_consumer htp;
                          htp._concat = false;
  
                          write_request(output).get();
                          repeat([&input, &htp] {
                              return input.read().then([&htp](const temporary_buffer<char>& b) mutable {
                                  return (b.size() == 0 || htp.read(b)) ? make_ready_future<stop_iteration>(stop_iteration::yes) :
                                          make_ready_future<stop_iteration>(stop_iteration::no);
                              });
                          }).get();
                          std::cout << htp._body << std::endl;
                          more = reader(count, htp);
                          count++;
                      }
                      if (input.eof()) {
                          input.close().get();
                      }
                  });
  
                  auto writer = seastar::async([&server, &write_func] {
                      class test_handler : public handler_base {
                          size_t count = 0;
                          http_server& _server;
                          std::function<future<>(output_stream<char> &&)> _write_func;
                          promise<> _all_message_sent;
                      public:
                          test_handler(http_server& server, std::function<future<>(output_stream<char> &&)>&& write_func) : _server(server), _write_func(write_func) {
                          }
                          future<std::unique_ptr<reply>> handle(const sstring& path,
                                  std::unique_ptr<request> req, std::unique_ptr<reply> rep) override {
                              rep->write_body("json", std::move(_write_func));
                              count++;
                              _all_message_sent.set_value();
                              return make_ready_future<std::unique_ptr<reply>>(std::move(rep));
                          }
                          future<> wait_for_message() {
                              return _all_message_sent.get_future();
                          }
                      };
                      auto handler = new test_handler(*server, std::move(write_func));
                      server->_routes.put(GET, "/test", handler);
                      when_all(server->do_accepts(0), handler->wait_for_message()).get();
                  });
                  return when_all(std::move(client), std::move(writer));
              }).discard_result().then_wrapped([&server] (auto f) {
                  f.ignore_ready_future();
                  return server->stop();
              });
          });
      }
      static future<> run(std::vector<std::tuple<bool, size_t>> tests) {
          return do_with(loopback_connection_factory(), foreign_ptr<shared_ptr<http_server>>(make_shared<http_server>("test")),
                  [tests] (loopback_connection_factory& lcf, auto& server) {
              return do_with(loopback_socket_impl(lcf), [&server, &lcf, tests](loopback_socket_impl& lsi) {
                  httpd::http_server_tester::listeners(*server).emplace_back(lcf.get_server_socket());
  
                  auto client = seastar::async([&lsi, tests] {
                      connected_socket c_socket = std::get<connected_socket>(lsi.connect(socket_address(ipv4_addr()), socket_address(ipv4_addr())).get());
                      input_stream<char> input(c_socket.input());
                      output_stream<char> output(c_socket.output());
                      bool more = true;
                      size_t count = 0;
                      while (more) {
                          http_consumer htp;
                          write_request(output).get();
                          repeat([&input, &htp] {
                              return input.read().then([&htp](const temporary_buffer<char>& b) mutable {
                                  return (b.size() == 0 || htp.read(b)) ? make_ready_future<stop_iteration>(stop_iteration::yes) :
                                          make_ready_future<stop_iteration>(stop_iteration::no);
                              });
                          }).get();
                          if (std::get<bool>(tests[count])) {
                              BOOST_REQUIRE_EQUAL(htp._body.length(), std::get<size_t>(tests[count]));
                          } else {
                              BOOST_REQUIRE_EQUAL(input.eof(), true);
                              more = false;
                          }
                          count++;
                          if (count == tests.size()) {
                              more = false;
                          }
                      }
                      if (input.eof()) {
                          input.close().get();
                      }
                  });
  
                  auto writer = seastar::async([&server, tests] {
                      class test_handler : public handler_base {
                          size_t count = 0;
                          http_server& _server;
                          std::vector<std::tuple<bool, size_t>> _tests;
                          promise<> _all_message_sent;
                      public:
                          test_handler(http_server& server, const std::vector<std::tuple<bool, size_t>>& tests) : _server(server), _tests(tests) {
                          }
                          future<std::unique_ptr<reply>> handle(const sstring& path,
                                  std::unique_ptr<request> req, std::unique_ptr<reply> rep) override {
                              rep->write_body("txt", make_writer(std::get<size_t>(_tests[count]), std::get<bool>(_tests[count])));
                              count++;
                              if (count == _tests.size()) {
                                  _all_message_sent.set_value();
                              }
                              return make_ready_future<std::unique_ptr<reply>>(std::move(rep));
                          }
                          future<> wait_for_message() {
                              return _all_message_sent.get_future();
                          }
                      };
                      auto handler = new test_handler(*server, tests);
                      server->_routes.put(GET, "/test", handler);
                      when_all(server->do_accepts(0), handler->wait_for_message()).get();
                  });
                  return when_all(std::move(client), std::move(writer));
              }).discard_result().then_wrapped([&server] (auto f) {
                  f.ignore_ready_future();
                  return server->stop();
              });
          });
      }
  
      static noncopyable_function<future<>(output_stream<char>&& o_stream)> make_writer(size_t len, bool success) {
          return [len, success] (output_stream<char>&& o_stream) mutable {
              return do_with(output_stream<char>(std::move(o_stream)), uint32_t(len/10), [success](output_stream<char>& str, uint32_t& remain) {
                  if (remain == 0) {
                      if (success) {
                          return str.close();
                      } else {
                          throw std::runtime_error("Throwing exception before writing");
                      }
                  }
                  return repeat([&str, &remain] () mutable {
                      return str.write("1234567890").then([&remain]() mutable {
                          remain--;
                          return (remain == 0)? make_ready_future<stop_iteration>(stop_iteration::yes) : make_ready_future<stop_iteration>(stop_iteration::no);
                      });
                  }).then([&str, success] {
                      if (!success) {
                          return str.flush();
                      }
                      return make_ready_future<>();
                  }).then([&str, success] {
                      if (success) {
                          return str.close();
                      } else {
                          throw std::runtime_error("Throwing exception after writing");
                      }
                  });
              });
          };
      }
  };
  
  SEASTAR_TEST_CASE(test_message_with_error_non_empty_body) {
      std::vector<std::tuple<bool, size_t>> tests = {
          std::make_tuple(true, 100),
          std::make_tuple(false, 10000)};
      return test_client_server::run(tests);
  }
  
  SEASTAR_TEST_CASE(test_simple_chunked) {
      std::vector<std::tuple<bool, size_t>> tests = {
          std::make_tuple(true, 100000),
          std::make_tuple(true, 100)};
      return test_client_server::run(tests);
  }
  
  SEASTAR_TEST_CASE(test_http_client_server_full) {
      std::vector<std::tuple<bool, size_t>> tests = {
          std::make_tuple(true, 100),
          std::make_tuple(true, 10000),
          std::make_tuple(true, 100),
          std::make_tuple(true, 0),
          std::make_tuple(true, 5000),
          std::make_tuple(true, 10000),
          std::make_tuple(true, 9000),
          std::make_tuple(true, 10000)};
      return test_client_server::run(tests);
  }
  
  /*
   * return string in the given size
   * The string size takes the quotes into consideration.
   */
  std::string get_value(int size) {
      std::stringstream res;
      for (auto i = 0; i < size - 2; i++) {
          res << "a";
      }
      return res.str();
  }
  
  /*
   * A helper object that map to a big json string
   * in the format of:
   * {"valu": "aaa....aa", "valu": "aaa....aa", "valu": "aaa....aa"...}
   *
   * The object can have an arbitrary size in multiplication of 10000 bytes
   *  */
  struct extra_big_object : public json::json_base {
      json::json_element<sstring>* value;
      extra_big_object(size_t size) {
          value = new json::json_element<sstring>;
          // size = brackets + (name + ": " + get_value) * n + ", " * (n-1)
          // size = 2 + (name + 6 + get_value) * n - 2
          value->_name = "valu";
          *value = get_value(9990);
          for (size_t i = 0; i < size/10000; i++) {
              _elements.emplace_back(value);
          }
      }
  
      virtual ~extra_big_object() {
          delete value;
      }
  
      extra_big_object(const extra_big_object& o) {
          value = new json::json_element<sstring>;
          value->_name = o.value->_name;
          *value = (*o.value)();
          for (size_t i = 0; i < o._elements.size(); i++) {
              _elements.emplace_back(value);
          }
      }
  };
  
  SEASTAR_TEST_CASE(json_stream) {
      std::vector<extra_big_object> vec;
      size_t num_objects = 1000;
      size_t total_size = num_objects * 1000001 + 1;
      for (size_t i = 0; i < num_objects; i++) {
          vec.emplace_back(1000000);
      }
      return test_client_server::run_test(json::stream_object(vec), [total_size](size_t s, http_consumer& h) {
          BOOST_REQUIRE_EQUAL(h._size, total_size);
          return false;
      });
  }
  
  SEASTAR_TEST_CASE(content_length_limit) {
      return seastar::async([] {
          loopback_connection_factory lcf;
          http_server server("test");
          server.set_content_length_limit(11);
          loopback_socket_impl lsi(lcf);
          httpd::http_server_tester::listeners(server).emplace_back(lcf.get_server_socket());
  
          future<> client = seastar::async([&lsi] {
              connected_socket c_socket = std::get<connected_socket>(lsi.connect(socket_address(ipv4_addr()), socket_address(ipv4_addr())).get());
              input_stream<char> input(c_socket.input());
              output_stream<char> output(c_socket.output());
  
              output.write(sstring("GET /test HTTP/1.1\r\nHost: test\r\n\r\n")).get();
              output.flush().get();
              auto resp = input.read().get0();
              BOOST_REQUIRE_NE(std::string(resp.get(), resp.size()).find("200 OK"), std::string::npos);
  
              output.write(sstring("GET /test HTTP/1.1\r\nHost: test\r\nContent-Length: 11\r\n\r\nxxxxxxxxxxx")).get();
              output.flush().get();
              resp = input.read().get0();
              BOOST_REQUIRE_NE(std::string(resp.get(), resp.size()).find("200 OK"), std::string::npos);
  
              output.write(sstring("GET /test HTTP/1.1\r\nHost: test\r\nContent-Length: 17\r\n\r\nxxxxxxxxxxxxxxxx")).get();
              output.flush().get();
              resp = input.read().get0();
              BOOST_REQUIRE_EQUAL(std::string(resp.get(), resp.size()).find("200 OK"), std::string::npos);
              BOOST_REQUIRE_NE(std::string(resp.get(), resp.size()).find("413 Payload Too Large"), std::string::npos);
  
              input.close().get();
              output.close().get();
          });
  
          future<> writer = seastar::async([&server] {
              class test_handler : public handler_base {
                  size_t count = 0;
                  http_server& _server;
                  std::function<future<>(output_stream<char> &&)> _write_func;
              public:
                  test_handler(http_server& server, std::function<future<>(output_stream<char> &&)>&& write_func) : _server(server), _write_func(write_func) {
                  }
                  future<std::unique_ptr<reply>> handle(const sstring& path,
                          std::unique_ptr<request> req, std::unique_ptr<reply> rep) override {
                      rep->write_body("json", _write_func);
                      return make_ready_future<std::unique_ptr<reply>>(std::move(rep));
                  }
              };
              auto handler = new test_handler(server, json::stream_object("hello"));
              server._routes.put(GET, "/test", handler);
              server.do_accepts(0).get();
          });
  
          client.get();
          writer.get();
          server.stop().get();
      });
  }
  