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, 7 insertions, 7 deletions

diff --git a/src/zenhttp/transports/asiotransport.cpp b/src/zenhttp/transports/asiotransport.cpp
index 23ac1bc8b..d5413b9af 100644
--- a/src/zenhttp/transports/asiotransport.cpp
+++ b/src/zenhttp/transports/asiotransport.cpp
@@ -47,10 +47,10 @@ private:
 	uint16_t m_BasePort	   = 8558;
 	int		 m_ThreadCount = 0;
 
-	asio::io_service					   m_IoService;
-	asio::io_service::work				   m_Work{m_IoService};
-	std::unique_ptr<AsioTransportAcceptor> m_Acceptor;
-	std::vector<std::thread>			   m_ThreadPool;
+	asio::io_context										   m_IoService;
+	asio::executor_work_guard<asio::io_context::executor_type> m_Work{m_IoService.get_executor()};
+	std::unique_ptr<AsioTransportAcceptor>					   m_Acceptor;
+	std::vector<std::thread>								   m_ThreadPool;
 };
 
 struct AsioTransportConnection : public TransportConnection, std::enable_shared_from_this<AsioTransportConnection>
@@ -85,7 +85,7 @@ private:
 
 struct AsioTransportAcceptor
 {
-	AsioTransportAcceptor(TransportServer* ServerInterface, asio::io_service& IoService, uint16_t BasePort);
+	AsioTransportAcceptor(TransportServer* ServerInterface, asio::io_context& IoService, uint16_t BasePort);
 	~AsioTransportAcceptor();
 
 	void Start();
@@ -95,7 +95,7 @@ struct AsioTransportAcceptor
 
 private:
 	TransportServer*		m_ServerInterface = nullptr;
-	asio::io_service&		m_IoService;
+	asio::io_context&		m_IoService;
 	asio::ip::tcp::acceptor m_Acceptor;
 	std::atomic<bool>		m_IsStopped{false};
 
@@ -104,7 +104,7 @@ private:
 
 //////////////////////////////////////////////////////////////////////////
 
-AsioTransportAcceptor::AsioTransportAcceptor(TransportServer* ServerInterface, asio::io_service& IoService, uint16_t BasePort)
+AsioTransportAcceptor::AsioTransportAcceptor(TransportServer* ServerInterface, asio::io_context& IoService, uint16_t BasePort)
 : m_ServerInterface(ServerInterface)
 , m_IoService(IoService)
 , m_Acceptor(m_IoService, asio::ip::tcp::v6())