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use bufio;
use fmt;
use net;
use net::tcp;
use net::ip;
use io;
use os;
use fs;
use strings;
use time;
use time::date;
use time::chrono;
use unix::poll;
use drawing;
use drawing::{pos};
use packet_reader;
use bytes;
def PORT: u16 = 41460;
type conn = net::socket;
def CHUNKSIZE = 512;
export fn main() void = {
// create 4 pictures. later we will have more pictures
// but for now there are just 4, and they are at fixed positions
const offs: [_]pos = [
(0,0), (0,CHUNKSIZE), (CHUNKSIZE,0), (CHUNKSIZE,CHUNKSIZE),
];
let pictures: []drawing::picture = alloc([],len(offs));
for (let i = 0z; i < len(offs); i +=1){
append(pictures, load_picture_from_file(offs[i])!);
};
const listener = match(tcp::listen(ip::ANY_V4, PORT, tcp::reuseaddr)) {
case let err: net::error =>
fmt::fatalf(net::strerror(err));
case let sock: net::socket =>
yield sock;
};
loop(listener, pictures);
};
def save_interval = 20 * time::SECOND;
// caller should free return value
fn filename_from_world_pos(pos: pos) str =
fmt::asprintf("./c.{}.{}.ppm",pos.0,pos.1);
fn save_world(pictures: []drawing::picture) void = {
fmt::printfln("saving world!")!;
for (const pic &.. pictures) {
const filename = filename_from_world_pos(pic.world_pos);
fmt::printfln("\t-> {}",filename)!;
defer free(filename);
const mode = fs::mode::USER_RW | fs::mode::GROUP_RW;
const file = os::create(filename, mode)!;
defer {
fmt::printfln("\t. {}",filename)!;
io::close(file)!;
};
const header = fmt::asprintf("P6\n{} {}\n{}\n", pic.w, pic.h, 255);
defer free(header);
io::writeall(file, strings::toutf8(header))!;
let buf: []u8 = alloc([0...],3*pic.w*pic.h);
defer free(buf);
for (let i = 0z; i < pic.w * pic.h; i += 1) {
const px = pic.d[i];
buf[3*i ] = ((px>>16)&0xff): u8;
buf[3*i+1] = ((px>>8) &0xff): u8;
buf[3*i+2] = ((px) &0xff): u8;
};
io::writeall(file, buf)!;
};
};
type bad_header = !void;
fn load_picture_from_file(world_pos: pos) (drawing::picture | fs::error | bad_header) = {
const filename = filename_from_world_pos(world_pos);
defer free(filename);
const file = os::open(filename)?;
fmt::printfln("reading from {}",filename)!;
defer {
fmt::printfln("closing {}",filename)!;
match (io::close(file)) {
case let err: io::error => fmt::println("error",io::strerror(err))!;
case => yield;
};
};
const header = fmt::asprintf("P6\n{} {}\n{}\n",CHUNKSIZE,CHUNKSIZE,255);
defer free(header);
const header_bytes = strings::toutf8(header);
let header_buf: []u8 = alloc([0...],len(header_bytes));
defer free(header_buf);
io::readall(file, header_buf)?;
if (!bytes::equal(header_buf, header_bytes)) return bad_header;
let file_buf: []u8 = alloc([0...], 3*CHUNKSIZE*CHUNKSIZE);
defer free(file_buf);
io::readall(file, file_buf)?;
let picture_buf: []u32 = alloc([0...], CHUNKSIZE*CHUNKSIZE);
for (let i = 0z; i < len(picture_buf); i += 1) {
picture_buf[i] = (file_buf[3*i]:u32<<16)
|(file_buf[3*i+1]:u32<<8)
|(file_buf[3*i+2]:u32);
if (picture_buf[i] != 0xffffff) fmt::println(i,picture_buf[i])!;
};
return drawing::picture {
w = CHUNKSIZE,
h = CHUNKSIZE,
d = picture_buf: *[*]u32,
world_pos = world_pos,
};
};
fn loop(listener: net::socket, pictures: []drawing::picture) void = {
// pollfds[0] is the listener
// pollfds[n>0] corresponds to packet_readers[n-1]
let pollfds: []poll::pollfd = alloc([ poll::pollfd {
fd = listener, events = poll::event::POLLIN, revents = 0
}]);
let packet_readers: []packet_reader::packet_reader = [];
let now = time::now(time::clock::MONOTONIC);
let next = time::add(now, save_interval);
save_world(pictures);
for (true) {
fmt::println("poll.")!;
const timeout = time::diff(now, next);
poll::poll(pollfds, timeout)!;
now = time::now(time::clock::MONOTONIC);
if (time::compare(now, next) >= 0) {
save_world(pictures);
next = time::add(now, save_interval);
};
if (0 != pollfds[0].revents & poll::event::POLLIN) {
fmt::println("new conn")!;
const new_conn = tcp::accept(pollfds[0].fd)!;
fmt::println("a")!;
append(pollfds, poll::pollfd {
fd = new_conn,
events = poll::event::POLLIN, revents = 0
});
append(packet_readers, packet_reader::new());
fmt::printfln("there are now {},{} conns.",len(pollfds),len(packet_readers))!;
send_world(new_conn, pictures)!;
};
for (let connidx = 1z; connidx < len(pollfds); connidx += 1) {
if (0 != pollfds[connidx].revents & poll::event::POLLIN) {
match (packet_reader::read(&packet_readers[connidx-1], pollfds[connidx].fd)) {
case void =>
for (const packet => packet_reader::next(&packet_readers[connidx-1])!) {
handle_packet(pictures, pollfds, packet, connidx);
};
case let err: io::error =>
fmt::printfln("#{} error: {}",connidx,io::strerror(err))!;
delete(pollfds[connidx]);
delete(packet_readers[connidx-1]);
connidx -= 1;
case io::EOF =>
fmt::printfln("#{} disconnect",connidx)!;
delete(pollfds[connidx]);
delete(packet_readers[connidx-1]);
connidx -= 1;
};
};
};
};
};
// ehh, really need a struct to put pollfds, pictures, connections... in
fn handle_packet(pictures: []drawing::picture, pollfds: []poll::pollfd, packet: packet_reader::packet, connidx: size) void = {
match (packet) {
case let op: packet_reader::packet_drawop =>
const opc = op as drawing::op_circle;
fmt::printfln("#{}: drawop ({:+6},{:+6})",connidx,opc.0,opc.1)!;
drawing::perform(pictures, opc);
for (let otheridx = 1z; otheridx < len(pollfds); otheridx += 1) {
if (otheridx == connidx) continue;
fmt::printfln("\t -> #{}",otheridx)!;
// ehhh shouldn't reserialize for each other thing
packet_reader::send(pollfds[otheridx].fd, packet)!;
};
case =>
abort("other packets not supported yet");
};
};
fn send_world(conn: io::file, pictures: []drawing::picture) (void | io::error) = {
for (const pic &.. pictures) {
packet_reader::send(conn, packet_reader::packet_sendchunk {
world_pos = pic.world_pos,
chunk_data = pic.d[..pic.w*pic.h],
})?;
};
};
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