mirror of
https://git.robbyzambito.me/zits
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255 lines
9.9 KiB
Zig
255 lines
9.9 KiB
Zig
const std = @import("std");
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const Message = @import("./message_parser.zig").Message;
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pub const ServerInfo = Message.ServerInfo;
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const ClientState = @import("./client.zig").ClientState;
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const Server = @This();
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info: ServerInfo,
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clients: std.AutoHashMapUnmanaged(usize, ClientState) = .empty,
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/// Map of subjects to a map of (client ID => SID)
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subscriptions: std.StringHashMapUnmanaged(std.AutoHashMapUnmanaged(usize, []const u8)) = .empty,
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pub fn main(gpa: std.mem.Allocator, server_config: ServerInfo) !void {
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var server: Server = .{
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.info = server_config,
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};
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var threaded: std.Io.Threaded = .init(gpa);
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defer threaded.deinit();
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const io = threaded.io();
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var tcp_server = try std.Io.net.IpAddress.listen(try std.Io.net.IpAddress.parse(
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server.info.host,
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server.info.port,
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), io, .{});
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defer tcp_server.deinit(io);
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var id: usize = 0;
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while (true) : (id +%= 1) {
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if (server.clients.contains(id)) continue;
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const stream = try tcp_server.accept(io);
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_ = io.async(handleConnection, .{ gpa, io, id, stream, &server });
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}
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}
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fn handleConnection(allocator: std.mem.Allocator, io: std.Io, id: usize, stream: std.Io.net.Stream, server: *Server) !void {
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defer stream.close(io);
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var w_buffer: [1024]u8 = undefined;
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var writer = stream.writer(io, &w_buffer);
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const out = &writer.interface;
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var r_buffer: [8192]u8 = undefined;
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var reader = stream.reader(io, &r_buffer);
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const in = &reader.interface;
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writeInfo(out, server.info) catch return;
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var connect_arena: std.heap.ArenaAllocator = .init(allocator);
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defer connect_arena.deinit();
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const connect = (Message.next(connect_arena.allocator(), in) catch return).connect;
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var client_state: ClientState = .init(id, connect);
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// server.clients.lockPointers();
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try server.clients.put(allocator, id, client_state);
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// server.clients.unlockPointers();
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// defer {
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// server.clients.lockPointers();
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// server.clients.remove(allocator, id);
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// server.clients.unlockPointers();
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// server.subscriptions.lockPointers();
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// var sub_iter = server.subscriptions.iterator();
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// var to_free: std.ArrayList(usize) = .empty;
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// defer to_free.deinit(allocator);
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// while (sub_iter.next()) |sub| {
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// while (std.simd.firstIndexOfValue(sub.value_ptr.*, id)) |i| {
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// sub.value_ptr.*.orderedRemove(i);
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// }
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// if (sub.value_ptr.items.len == 0) {
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// to_free.append(allocator, sub.index);
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// }
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// }
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// server.subscriptions.orderedRemoveAtMany(allocator, to_free.items);
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// server.subscriptions.unlockPointers();
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// }
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processClient(allocator, io, in, out, server, &client_state) catch |err| {
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std.debug.panic("Error processing client: {}\n", .{err});
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};
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}
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fn processClient(gpa: std.mem.Allocator, io: std.Io, in: *std.Io.Reader, out: *std.Io.Writer, server: *Server, client_state: *ClientState) !void {
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var parse_task = io.async(parseMessages, .{ gpa, io, in, client_state });
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defer if (parse_task.cancel(io)) {} else |err| {
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std.debug.print("Error canceling parse_task for {d}: {any}", .{ client_state.id, err });
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};
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var write_task = io.async(writeMessages, .{ io, out, server.*, client_state });
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defer if (write_task.cancel(io)) {} else |err| {
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std.debug.print("Error canceling write_task for {d}: {any}", .{ client_state.id, err });
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};
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while (!io.cancelRequested()) {
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if (client_state.send_queue.getOne(io)) |msg| {
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switch (msg) {
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// TODO: REMOVE
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.not_real => {},
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// Respond to ping with pong.
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.ping => {
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try client_state.recv_queue.putOne(io, .pong);
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},
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.@"pub" => |p| {
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std.debug.print("subs (in pub): {any}\n", .{server.subscriptions});
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std.debug.print("subs size: {d}\n", .{server.subscriptions.size});
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std.debug.print("subs subjects:\n", .{});
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var key_iter = server.subscriptions.keyIterator();
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while (key_iter.next()) |k| {
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std.debug.print("- {s}\n", .{k.*});
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} else std.debug.print("<none>\n", .{});
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std.debug.print("pub subject: '{s}'\n", .{p.subject});
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std.debug.print("pub: {any}\n", .{p});
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errdefer _ = client_state.recv_queue.put(io, &.{.@"-err"}, 1) catch {};
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// Just publishing to exact matches right now.
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// TODO: Publish to pattern matching subjects.
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if (server.subscriptions.get(p.subject)) |subs| {
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var subs_iter = subs.iterator();
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while (subs_iter.next()) |sub| {
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var client = server.clients.get(sub.key_ptr.*) orelse std.debug.panic("Trying to pub to a client that doesn't exist!\n", .{});
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std.debug.print("{d} is pubbing to {d}\n", .{ client_state.id, client.id });
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if ((try client.recv_queue.put(
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io,
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&.{
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.{
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.msg = .{
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.subject = p.subject,
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.sid = sub.value_ptr.*,
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.reply_to = p.reply_to,
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.payload = p.payload,
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},
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},
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},
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0,
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)) > 0) {
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std.debug.print("published message!\n", .{});
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} else {
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std.debug.print("skipped publishing for some reason\n", .{});
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}
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}
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try client_state.recv_queue.putOne(io, .@"+ok");
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} else {
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std.debug.print("no subs with subject\n", .{});
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}
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},
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.sub => |s| {
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var subscribers = try server.subscriptions.getOrPut(gpa, s.subject);
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if (!subscribers.found_existing) {
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subscribers.value_ptr.* = .empty;
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}
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try subscribers.value_ptr.*.put(gpa, client_state.id, s.sid);
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std.debug.print("subs: {any}\n", .{server.subscriptions});
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},
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.info => |info| {
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std.debug.panic("got an info message? : {any}\n", .{info});
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},
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else => |m| {
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std.debug.panic("Unimplemented: {any}\n", .{m});
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},
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}
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} else |err| return err;
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}
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// while (true) {
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// switch (next_message) {
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// .connect => |connect| {
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// std.debug.panic("Connection message after already connected: {any}\n", .{connect});
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// },
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// .ping => try writePong(out),
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// .@"pub" => try writeOk(out),
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// else => |msg| std.debug.panic("Message type not implemented: {any}\n", .{msg}),
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// }
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// }
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}
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fn parseMessages(gpa: std.mem.Allocator, io: std.Io, in: *std.Io.Reader, client_state: *ClientState) !void {
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// var message_parsing_arena: std.heap.ArenaAllocator = .init();
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// defer message_parsing_arena.deinit();
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// const message_parsing_allocator = message_parsing_arena.allocator();
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while (!io.cancelRequested()) {
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// defer _ = message_parsing_arena.reset(.retain_capacity);
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const next_message = // Message.next(message_parsing_allocator, in)
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Message.next(gpa, in) catch |err| {
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switch (err) {
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error.EndOfStream => {
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break;
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},
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else => {
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return err;
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},
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}
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};
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std.debug.print("received message from client {d}: {any}\n'{s}'\n", .{ client_state.id, next_message, in.buffered() });
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try client_state.send_queue.putOne(io, next_message);
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}
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}
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fn writeMessages(io: std.Io, out: *std.Io.Writer, server: Server, client_state: *ClientState) !void {
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while (true) {
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std.debug.print("in writeMessage loop for {d}\n", .{client_state.id});
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if (client_state.recv_queue.getOne(io)) |msg| {
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std.debug.print("attempting to write message for {d}: {any}\n", .{ client_state.id, msg });
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switch (msg) {
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.@"+ok" => try writeOk(out),
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.pong => try writePong(out),
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.info => try writeInfo(out, server.info),
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.msg => |m| try writeMsg(out, m),
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else => std.debug.panic("unimplemented write", .{}),
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}
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} else |err| return err;
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}
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}
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fn writeOk(out: *std.Io.Writer) !void {
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_ = try out.write("+OK\r\n");
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try out.flush();
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}
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fn writePong(out: *std.Io.Writer) !void {
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_ = try out.write("PONG\r\n");
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try out.flush();
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}
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fn writeInfo(out: *std.Io.Writer, info: ServerInfo) !void {
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_ = try out.write("INFO ");
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try std.json.Stringify.value(info, .{}, out);
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_ = try out.write("\r\n");
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try out.flush();
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}
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fn writeMsg(out: *std.Io.Writer, msg: Message.Msg) !void {
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std.debug.print("PRINTING MESSAGE\n\n\n\n", .{});
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try out.print(
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"MSG {s} {s} {s} {d}\r\n{s}\r\n",
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.{
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msg.subject,
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msg.sid,
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msg.reply_to orelse "",
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msg.payload.len,
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msg.payload,
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},
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);
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try out.flush();
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}
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pub fn createId() []const u8 {
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return "SERVERID";
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}
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pub fn createName() []const u8 {
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return "SERVERNAME";
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}
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// test "handle pub" {
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// const io = std.testing.io;
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// }
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