Update the websocketpp library and change the configuration options w…

…e pass

when creating the websocket servers to enable deflate compression on
websocket frames.  This is relevant to cryptonomex/graphene#540 because
the spammed data is higly compressible.  In my tests, it reduces bandwidth
for a single idle node by a factor of ~16, from 577kbps down to 36kbps.
This doesn't require any changes to the wallets, simply upgrading the
public servers will begin sending compressed data to all clients that
support it.
Note: this commit adds a dependency on zlib for non-apple platforms
(it was already required on apple)

CMakeLists.txt

@@ -142,6 +142,17 @@ find_package(OpenSSL REQUIRED)
 
 set( CMAKE_FIND_LIBRARY_SUFFIXES ${ORIGINAL_LIB_SUFFIXES} )
 
+# We are now building in support for deflate compression into our websockets layer by default,
+# which requires zlib.  Aside from that, all of fc compiles without zlib, so this could be
+# made optional without much effort
+# (important exception, apple: as of 10.10 yosemite, the OpenSSL static libraries shipped with 
+# os x have a dependency on zlib)
+# On a side note, fc's fc::zlib_compress() function uses a separate implementation of zlib
+# from the miniz library.  If we're comfortable requiring an external zlib, we can 
+# reimplement fc::zlib_compress() to call the real zlib, and remove miniz.c from our
+# repository.
+find_package( ZLIB REQUIRED )
+
 option( UNITY_BUILD OFF )
 
 set( fc_sources
@@ -473,14 +484,6 @@ if(WIN32)
 
 endif(WIN32)
 
-IF(APPLE)
-  # As of 10.10 yosemite, the OpenSSL static libraries shipped with os x have a dependency
-  # on zlib, so any time you link in openssl you also need to link zlib.  .  We really want to detect whether openssl was configured with the --no-zlib
-  # option or not when it was built, but that's difficult to do in practice, so we
-  # just always try to link it in on mac.
-  find_package( ZLIB REQUIRED )
-ENDIF(APPLE)
-
 SET(OPENSSL_CONF_TARGET )
 IF(DEFINED CMAKE_RUNTIME_OUTPUT_DIRECTORY)
   SET (OPENSSL_CONF_TARGET ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})

src/network/http/websocket.cpp

@@ -3,6 +3,7 @@
 #include <websocketpp/config/asio.hpp>
 #include <websocketpp/server.hpp>
 #include <websocketpp/config/asio_client.hpp>
+#include <websocketpp/extensions/permessage_deflate/enabled.hpp>
 #include <websocketpp/client.hpp>
 #include <websocketpp/logger/stub.hpp>
 
@@ -61,47 +62,12 @@ namespace fc { namespace http {
               transport_type;
 
           static const long timeout_open_handshake = 0;
-      };
-      struct asio_tls_with_stub_log : public websocketpp::config::asio_tls {
-
-          typedef asio_with_stub_log type;
-          typedef asio_tls base;
-
-          typedef base::concurrency_type concurrency_type;
-
-          typedef base::request_type request_type;
-          typedef base::response_type response_type;
-
-          typedef base::message_type message_type;
-          typedef base::con_msg_manager_type con_msg_manager_type;
-          typedef base::endpoint_msg_manager_type endpoint_msg_manager_type;
-
-          /// Custom Logging policies
-          /*typedef websocketpp::log::syslog<concurrency_type,
-              websocketpp::log::elevel> elog_type;
-          typedef websocketpp::log::syslog<concurrency_type,
-              websocketpp::log::alevel> alog_type;
-          */
-          //typedef base::alog_type alog_type;
-          //typedef base::elog_type elog_type;
-          typedef websocketpp::log::stub elog_type;
-          typedef websocketpp::log::stub alog_type;
 
-          typedef base::rng_type rng_type;
+          /// permessage_compress extension
+          struct permessage_deflate_config {};
 
-          struct transport_config : public base::transport_config {
-              typedef type::concurrency_type concurrency_type;
-              typedef type::alog_type alog_type;
-              typedef type::elog_type elog_type;
-              typedef type::request_type request_type;
-              typedef type::response_type response_type;
-              typedef websocketpp::transport::asio::tls_socket::endpoint socket_type;
-          };
-
-          typedef websocketpp::transport::asio::endpoint<transport_config>
-              transport_type;
-
-          static const long timeout_open_handshake = 0;
+          typedef websocketpp::extensions::permessage_deflate::enabled
+              <permessage_deflate_config> permessage_deflate_type;
       };
       struct asio_tls_stub_log : public websocketpp::config::asio_tls {
          typedef asio_tls_stub_log type;
@@ -124,16 +90,22 @@ namespace fc { namespace http {
          typedef base::rng_type rng_type;
 
          struct transport_config : public base::transport_config {
-         typedef type::concurrency_type concurrency_type;
-         typedef type::alog_type alog_type;
-         typedef type::elog_type elog_type;
-         typedef type::request_type request_type;
-         typedef type::response_type response_type;
-         typedef websocketpp::transport::asio::tls_socket::endpoint socket_type;
+            typedef type::concurrency_type concurrency_type;
+            typedef type::alog_type alog_type;
+            typedef type::elog_type elog_type;
+            typedef type::request_type request_type;
+            typedef type::response_type response_type;
+            typedef websocketpp::transport::asio::tls_socket::endpoint socket_type;
          };
 
          typedef websocketpp::transport::asio::endpoint<transport_config>
          transport_type;
+
+         /// permessage_compress extension
+         struct permessage_deflate_config {};
+
+         typedef websocketpp::extensions::permessage_deflate::enabled
+             <permessage_deflate_config> permessage_deflate_type;
       };