upgrade asio from 1.29.0 to 1.38.0 (#827)

Migrate removed deprecated APIs:
- io_service -> io_context
- io_service::work -> executor_work_guard
- resolver::query/iterator -> resolver::resolve() with results_type
- address::from_string() -> make_address()

---

Breaking Changes (1.33.0)
  - deferred as default completion token — can omit token in coroutines: co_await socket.async_read_some(buf)
  - cancel_after / cancel_at — timeout any async operation: co_await sock.async_read_some(buf, cancel_after(5s))
  - Partial completion token adapters — as_tuple, redirect_error, bind_executor etc. composable via pipe: co_await (async_write(sock, buf) | as_tuple | cancel_after(10s))
  - composed — simpler alternative to async_compose for stateful operation implementations
  - co_composed moved out of experimental

  1.35.0 — Allocator & Resolver
  - Allocator constructors for io_context and thread_pool — control memory allocation for services, I/O objects, strands
  - Configurable resolver thread pool ("resolver"/"threads")
  - Timer heap pre-allocation ("timer"/"heap_reserve")

  1.37.0 — Inline Executors & Reactor Tuning
  - inline_executor — always executes inline (useful as completion executor)
  - inline_or_executor<> — tries inline first, falls back to wrapped executor
  - New dispatch/post/defer overloads that run a function on one executor and deliver result to a handler on another
  - redirect_disposition — captures disposition into a variable (like redirect_error but generic)
  - Reactor config: reset_edge_on_partial_read, use_eventfd, use_timerfd

  Notable Fixes

  - Resource leak in awaitable move assignment (1.37.0)
  - Memory leak in SSL stream move assignment (1.37.0)
  - Thread sanitizer issue in kqueue reactor (1.37.0)
  - co_spawn non-reentrant completion handler fix (1.36.0)
  - Windows file append mode fix (1.32.0)
  - SSL engine move assignment leak (1.33.0)

1 files changed, 12 insertions, 12 deletions

diff --git a/src/zenhttp/servers/httpasio.cpp b/src/zenhttp/servers/httpasio.cpp
index ee8e71256..e8b27da70 100644
--- a/src/zenhttp/servers/httpasio.cpp
+++ b/src/zenhttp/servers/httpasio.cpp
@@ -530,9 +530,9 @@ public:
 
 	int GetEffectiveHttpsPort() const;
 
-	asio::io_service						 m_IoService;
-	asio::io_service::work					 m_Work{m_IoService};
-	std::unique_ptr<asio_http::HttpAcceptor> m_Acceptor;
+	asio::io_context										   m_IoService;
+	asio::executor_work_guard<asio::io_context::executor_type> m_Work{m_IoService.get_executor()};
+	std::unique_ptr<asio_http::HttpAcceptor>				   m_Acceptor;
 #if defined(ASIO_HAS_LOCAL_SOCKETS)
 	std::unique_ptr<asio_http::UnixAcceptor> m_UnixAcceptor;
 #endif
@@ -1507,7 +1507,7 @@ HttpServerConnectionT<SocketType>::HandleRequest()
 struct TcpAcceptorBase
 {
 	TcpAcceptorBase(HttpAsioServerImpl& Server,
-					asio::io_service&	IoService,
+					asio::io_context&	IoService,
 					uint16_t			BasePort,
 					bool				ForceLoopback,
 					bool				AllowPortProbing,
@@ -1580,7 +1580,7 @@ protected:
 	virtual void OnAccept(std::unique_ptr<asio::ip::tcp::socket> Socket) = 0;
 
 	HttpAsioServerImpl& m_Server;
-	asio::io_service&	m_IoService;
+	asio::io_context&	m_IoService;
 
 private:
 	template<typename AddressType>
@@ -1785,7 +1785,7 @@ private:
 
 struct HttpAcceptor final : TcpAcceptorBase
 {
-	HttpAcceptor(HttpAsioServerImpl& Server, asio::io_service& IoService, uint16_t BasePort, bool ForceLoopback, bool AllowPortProbing)
+	HttpAcceptor(HttpAsioServerImpl& Server, asio::io_context& IoService, uint16_t BasePort, bool ForceLoopback, bool AllowPortProbing)
 	: TcpAcceptorBase(Server, IoService, BasePort, ForceLoopback, AllowPortProbing, "HTTP")
 	{
 	}
@@ -1810,7 +1810,7 @@ protected:
 
 struct UnixAcceptor
 {
-	UnixAcceptor(HttpAsioServerImpl& Server, asio::io_service& IoService, const std::string& SocketPath)
+	UnixAcceptor(HttpAsioServerImpl& Server, asio::io_context& IoService, const std::string& SocketPath)
 	: m_Server(Server)
 	, m_IoService(IoService)
 	, m_Acceptor(m_IoService)
@@ -1897,7 +1897,7 @@ private:
 	}
 
 	HttpAsioServerImpl&					   m_Server;
-	asio::io_service&					   m_IoService;
+	asio::io_context&					   m_IoService;
 	asio::local::stream_protocol::acceptor m_Acceptor;
 	std::string							   m_SocketPath;
 	bool								   m_IsValid{false};
@@ -1913,7 +1913,7 @@ private:
 struct HttpsAcceptor final : TcpAcceptorBase
 {
 	HttpsAcceptor(HttpAsioServerImpl& Server,
-				  asio::io_service&	  IoService,
+				  asio::io_context&	  IoService,
 				  asio::ssl::context& SslContext,
 				  uint16_t			  Port,
 				  bool				  ForceLoopback,
@@ -2284,7 +2284,7 @@ HttpAsioServerImpl::Stop()
 
 	// Drain remaining handlers (e.g. cancellation callbacks from active WebSocket
 	// connections) so that their captured Ref<> pointers are released while the
-	// io_service and its epoll reactor are still alive.  Without this, sockets
+	// io_context and its epoll reactor are still alive.  Without this, sockets
 	// held by external code (e.g. IWebSocketHandler connection lists) can outlive
 	// the reactor and crash during deregistration.
 	m_IoService.restart();
@@ -2486,9 +2486,9 @@ HttpAsioServer::OnGetExternalHost() const
 	// causes the OS to select the appropriate local interface without sending any data.
 	try
 	{
-		asio::io_service	  IoService;
+		asio::io_context	  IoService;
 		asio::ip::udp::socket Sock(IoService, asio::ip::udp::v4());
-		Sock.connect(asio::ip::udp::endpoint(asio::ip::address::from_string("8.8.8.8"), 80));
+		Sock.connect(asio::ip::udp::endpoint(asio::ip::make_address("8.8.8.8"), 80));
 		return Sock.local_endpoint().address().to_string();
 	}
 	catch (const std::exception&)