From fac9e8bec1983fa9dff8f447fef106e427dfec26 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 20 Jul 2023 17:02:05 +0200
Subject: c++: Renamed src to c++

---
 c++/io/io.h | 219 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 219 insertions(+)
 create mode 100644 c++/io/io.h

(limited to 'c++/io/io.h')

diff --git a/c++/io/io.h b/c++/io/io.h
new file mode 100644
index 0000000..7653ace
--- /dev/null
+++ b/c++/io/io.h
@@ -0,0 +1,219 @@
+#pragma once
+
+#include <forstio/async/async.h>
+#include <forstio/core/common.h>
+#include "io_helpers.h"
+
+#include <string>
+#include <variant>
+
+namespace saw {
+/**
+ * Set of error common in io
+ */
+namespace err {
+struct disconnected {
+	static constexpr std::string_view description = "Disconnected";
+	static constexpr bool is_critical = true;
+};
+
+struct resource_busy {
+	static constexpr std::string_view description = "Resource busy";
+	static constexpr bool is_critical = false;
+};
+}
+/*
+ * Input stream
+ */
+class input_stream {
+public:
+	virtual ~input_stream() = default;
+
+	virtual error_or<size_t> read(void *buffer, size_t length) = 0;
+
+	virtual conveyor<void> read_ready() = 0;
+
+	virtual conveyor<void> on_read_disconnected() = 0;
+};
+
+/*
+ * Output stream
+ */
+class output_stream {
+public:
+	virtual ~output_stream() = default;
+
+	virtual error_or<size_t> write(const void *buffer, size_t length) = 0;
+
+	virtual conveyor<void> write_ready() = 0;
+};
+
+/*
+ * Io stream
+ */
+class io_stream : public input_stream, public output_stream {
+public:
+	virtual ~io_stream() = default;
+};
+
+class async_input_stream {
+public:
+	virtual ~async_input_stream() = default;
+
+	virtual void read(void *buffer, size_t min_length, size_t max_length) = 0;
+
+	virtual conveyor<size_t> read_done() = 0;
+	virtual conveyor<void> on_read_disconnected() = 0;
+};
+
+class async_output_stream {
+public:
+	virtual ~async_output_stream() = default;
+
+	virtual void write(const void *buffer, size_t length) = 0;
+
+	virtual conveyor<size_t> write_done() = 0;
+};
+
+class async_io_stream final : public async_input_stream,
+							  public async_output_stream {
+private:
+	own<io_stream> stream_;
+
+	conveyor_sink read_ready_;
+	conveyor_sink write_ready_;
+	conveyor_sink read_disconnected_;
+
+	read_task_and_step_helper read_stepper_;
+	write_task_and_step_helper write_stepper_;
+
+public:
+	async_io_stream(own<io_stream> str);
+
+	SAW_FORBID_COPY(async_io_stream);
+	SAW_FORBID_MOVE(async_io_stream);
+
+	void read(void *buffer, size_t length, size_t max_length) override;
+
+	conveyor<size_t> read_done() override;
+
+	conveyor<void> on_read_disconnected() override;
+
+	void write(const void *buffer, size_t length) override;
+
+	conveyor<size_t> write_done() override;
+};
+
+class server {
+public:
+	virtual ~server() = default;
+
+	virtual conveyor<own<io_stream>> accept() = 0;
+};
+
+class network_address;
+/**
+ * Datagram class. Bound to a local address it is able to receive inbound
+ * datagram messages and send them as well as long as an address is provided as
+ * well
+ */
+class datagram {
+public:
+	virtual ~datagram() = default;
+
+	virtual error_or<size_t> read(void *buffer, size_t length) = 0;
+	virtual conveyor<void> read_ready() = 0;
+
+	virtual error_or<size_t> write(const void *buffer, size_t length,
+								   network_address &dest) = 0;
+	virtual conveyor<void> write_ready() = 0;
+};
+
+class os_network_address;
+class string_network_address;
+
+class network_address {
+public:
+	using child_variant =
+		std::variant<os_network_address *, string_network_address *>;
+
+	virtual ~network_address() = default;
+
+	virtual network_address::child_variant representation() = 0;
+
+	virtual const std::string &address() const = 0;
+	virtual uint16_t port() const = 0;
+};
+
+class os_network_address : public network_address {
+public:
+	virtual ~os_network_address() = default;
+
+	network_address::child_variant representation() override { return this; }
+};
+
+class string_network_address final : public network_address {
+private:
+	std::string address_value_;
+	uint16_t port_value_;
+
+public:
+	string_network_address(const std::string &address, uint16_t port);
+
+	const std::string &address() const override;
+	uint16_t port() const override;
+
+	network_address::child_variant representation() override { return this; }
+};
+
+class network {
+public:
+	virtual ~network() = default;
+
+	/**
+	 * Resolve the provided string and uint16 to the preferred storage method
+	 */
+	virtual conveyor<own<network_address>>
+	resolve_address(const std::string &addr, uint16_t port_hint = 0) = 0;
+
+	/**
+	 * Parse the provided string and uint16 to the preferred storage method
+	 * Since no dns request is made here, no async conveyors have to be used.
+	 */
+	/// @todo implement
+	// virtual Own<NetworkAddress> parseAddress(const std::string& addr,
+	// uint16_t port_hint = 0) = 0;
+
+	/**
+	 * Set up a listener on this address
+	 */
+	virtual own<server> listen(network_address &bind_addr) = 0;
+
+	/**
+	 * Connect to a remote address
+	 */
+	virtual conveyor<own<io_stream>> connect(network_address &address) = 0;
+
+	/**
+	 * Bind a datagram socket at this address.
+	 */
+	virtual own<datagram> datagram(network_address &address) = 0;
+};
+
+class io_provider {
+public:
+	virtual ~io_provider() = default;
+
+	virtual own<input_stream> wrap_input_fd(int fd) = 0;
+
+	virtual network &get_network() = 0;
+};
+
+struct async_io_context {
+	own<io_provider> io;
+	event_loop &event_loop;
+	event_port &event_port;
+};
+
+error_or<async_io_context> setup_async_io();
+} // namespace saw
-- 
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