From df26827a3f00d64f5af01271818c7c8bd7eaa387 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Fri, 5 Apr 2024 00:57:56 +0100
Subject: start of networking, and packet_reader

---
 server/main.ha | 143 +++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 109 insertions(+), 34 deletions(-)

(limited to 'server')

diff --git a/server/main.ha b/server/main.ha
index 43bdf34..f1eec0a 100644
--- a/server/main.ha
+++ b/server/main.ha
@@ -1,43 +1,118 @@
 use fmt;
-use os;
+use net;
+use net::tcp;
+use net::ip;
 use io;
-use fs;
-use errors;
-use drawing::{pos};
+use os;
+use unix::poll;
+use bufio;
 
-// type chunk = struct {
-// 	fd: io::file,
-// 	d: []u32,
-// };
+def PORT: u16 = 41460;
 
-// def CHUNKSIZE: size = 512;
-// def CHUNK_LENGTH: size = CHUNKSIZE*CHUNKSIZE*size(u32);
-
-// fn open_chunk_file(chunkpos: pos) (chunk | fs::error) = {
-// 	const path = fmt::asprintf("c.{}.{}.dat", chunkpos.0, chunkpos.1);
-// 	defer free(path);
-// 	const fd = fs::create_file(os::cwd, path,
-// 		fs::mode::USER_RW | fs::mode::GROUP_RW,
-// 		fs::flag::RDWR)?;
-// 	io::trunc(fd, CHUNK_LENGTH)?;
-// 	const dp = io::mmap(null, CHUNK_LENGTH,
-// 		io::prot::READ | io::prot::WRITE,
-// 		io::mflag::SHARED,
-// 		fd, 0)?;
-// 	const d = (dp: *[*]u32)[..CHUNKSIZE*CHUNKSIZE];
-// 	return chunk { fd = fd, d = d };
-// };
+type conn = net::socket;
+
+type packet = []u8;
+def PCKSZ: size = 4;
+
+type packet_reader = struct {
+	buf: [256]u8,
+	good: []u8,
+};
+
+fn packet_reader_new() packet_reader = {
+	let pr = packet_reader {
+		buf = [0...],
+		...
+	};
+	pr.good = pr.buf[0..0];
+	return pr;
+
+};
+
+// call when input is ready. could block otherwise
+fn packet_reader_read(pr: *packet_reader, sock: net::socket) (void | io::error | io::EOF) = {
+	const remaining_amt = len(pr.good);
+	const read_pos = if (remaining_amt > 0) {
+		// still some unconsumed content in the buffer
+		// move unconsumed stuff to start of buffer
+		fmt::printfln("moving {} remaining bytes",remaining_amt)!;
+		pr.buf[0..remaining_amt] = pr.good;
+		yield remaining_amt;
+	} else 0z;
+	const nread = match(io::read(sock, pr.buf[read_pos..])?) {
+		case io::EOF => return io::EOF;
+		case let n: size => yield n;
+	};
+	fmt::printfln("read {} bytes",nread)!;
+	const total_amt = read_pos + nread;
+	pr.good = pr.buf[0..total_amt];
+	fmt::printfln("now {} bytes in buffer",total_amt)!;
+};
+
+
+fn packet_reader_next(pr: *packet_reader) (packet | done) = {
+	// either parse a full packet out of the front of good,
+	// move good along that many bytes,
+	// and return the packet,
+	// or, ascertain there is no full packet, and return done
+	if (len(pr.good) < PCKSZ) return done;
+	const packet_bytes = pr.good[..PCKSZ];
+	pr.good = pr.good[PCKSZ..];
+	return packet_bytes;
+};
 
 export fn main() void = {
-	// match (open_chunk_file((-3,12))) {
-	// case let e: fs::error =>
-	// 	fmt::fatal(fs::strerror(e));
-	// case let ch: chunk =>
-	// 	ch.d[0] = 0x12345678;
-	// 	ch.d[CHUNKSIZE*CHUNKSIZE - 1]=0xdeadbeef;
-	// };
+	const listener = tcp::listen(ip::ANY_V4, PORT)!;
+	const conn = tcp::accept(listener)!;
 
-	const t = test2 { a=4, b=5 };
-	thethe(&t);
+	const pr = packet_reader_new();
+	for :mainloop (true) {
+		if (packet_reader_read(&pr, conn)! is io::EOF)
+			fmt::fatal("disconnected");
+		let i = 0;
+		for (const packet => packet_reader_next(&pr)) {
+			fmt::printf("#{} got {}:",i,len(packet))!;
+			i+=1;
+			for (let byte .. packet) fmt::printf(" {:x}",byte)!;
+			fmt::println("")!;
+		};
+	};
 
 };
+
+
+// fn loop(listener: net::socket) void = {
+// 	const buf: [256]u8 = [0...];
+// 	let pollfds: []poll::pollfd = alloc([ poll::pollfd {
+// 		fd = listener, events = poll::event::POLLIN, revents = 0
+// 	}]);
+
+// 	for (true) {
+// 		poll::poll(pollfds, poll::INDEF)!;
+// 		if (0 != pollfds[0].revents & poll::event::POLLIN) {
+// 			fmt::println("new conn")!;
+// 			append(pollfds, poll::pollfd {
+// 				fd = tcp::accept(pollfds[0].fd)!,
+// 				events = poll::event::POLLIN, revents = 0
+// 			});
+// 		};
+// 		for (let i = 1z; i < len(pollfds); i += 1) {
+// 			if (0 != pollfds[i].revents & poll::event::POLLIN) {
+// 				match (io::read(pollfds[i].fd, buf)!) {
+// 				case io::EOF =>
+// 					fmt::println("disconnect", i)!;
+// 					delete(pollfds[i]);
+// 					i -= 1;
+// 				case let n: size =>
+// 					io::write(os::stdout_file, buf[..n])!;
+// 					for (let j = 1z; j < len(pollfds); j += 1) {
+// 						if (i != j) {
+// 							io::writeall(pollfds[j].fd, buf[..n])!;
+// 						};
+// 					};
+// 				};
+// 			};
+
+// 		};
+// 	};
+// };
-- 
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