src/server/client.zig

@@ -11,41 +11,130 @@ pub const ClientState = struct {
     recv_queue: std.Io.Queue(Message),
     recv_queue_buffer: [1024]Message = undefined,
 
-    /// Mapping of the subjects to the IDs.
-    subscription_ids: std.StringHashMapUnmanaged([]const u8) = .empty,
+    from_client: *std.Io.Reader,
+    to_client: *std.Io.Writer,
 
-    pub fn init(id: usize, connect: Message.Connect) ClientState {
+    write_task: std.Io.Future(void),
+    read_task: std.Io.Future(void),
+
+    pub fn init(
+        io: std.Io,
+        allocator: std.mem.Allocator,
+        id: usize,
+        connect: Message.Connect,
+        in: *std.Io.Reader,
+        out: *std.Io.Writer,
+    ) ClientState {
         var res: ClientState = .{
             .id = id,
             .connect = connect,
             .send_queue = undefined,
             .recv_queue = undefined,
+            .from_client = in,
+            .to_client = out,
+            .write_task = undefined,
+            .read_task = undefined,
         };
         res.send_queue = .init(&res.send_queue_buffer);
         res.recv_queue = .init(&res.recv_queue_buffer);
+        const write_task = io.async(processWrite, .{ &res, io, out });
+        // @compileLog(@TypeOf(write_task));
+        const read_task = io.async(processRead, .{ &res, io, allocator, in });
+        // @compileLog(@TypeOf(read_task));
+        res.write_task = write_task;
+        res.read_task = read_task;
+
         return res;
     }
 
-    pub fn deinit(self: *ClientState, alloc: std.mem.Allocator) void {
-        self.subscription_ids.clearAndFree(alloc);
+    fn processWrite(
+        self: *ClientState,
+        io: std.Io,
+        out: *std.Io.Writer,
+    ) void {
+        while (true) {
+            const message = self.recv_queue.getOne(io) catch break;
+            switch (message) {
+                .@"+ok" => writeOk(out) catch break,
+                .pong => writePong(out) catch break,
+                .info => |info| writeInfo(out, info) catch break,
+                .msg => |m| writeMsg(out, m) catch break,
+                else => std.debug.panic("unimplemented write", .{}),
+            }
+        }
     }
 
-    pub fn subscribe(self: *ClientState, gpa: std.mem.Allocator, sub: Message.Sub) !void {
-        self.subscription_ids.lockPointers();
-        defer self.subscription_ids.unlockPointers();
-        try self.subscription_ids.putNoClobber(gpa, sub.subject, sub.sid);
-    }
-
-    pub fn unsubscribe(self: *ClientState, gpa: std.mem.Allocator, sid: []const u8) void {
-        _ = gpa;
-        self.subscription_ids.lockPointers();
-        defer self.subscription_ids.unlockPointers();
-        var iter = self.subscription_ids.iterator();
-        while (iter.next()) |entry| {
-            if (std.mem.eql(u8, sid, entry.value_ptr.*)) {
-                self.subscription_ids.swapRemove(entry.value_ptr.*);
+    fn processRead(
+        self: *ClientState,
+        io: std.Io,
+        allocator: std.mem.Allocator,
+        in: *std.Io.Reader,
+    ) void {
+        while (true) {
+            const next_message = Message.next(allocator, in) catch |err| switch (err) {
+                error.EndOfStream => {
                     break;
+                },
+                else => {
+                    std.debug.panic("guh: {any}\n", .{err});
+                    break;
+                    // return err;
+                },
+            };
+            self.send_queue.putOne(io, next_message) catch break;
         }
-        } else unreachable; // Assert that the SID is in the subscriptions.
+    }
+
+    pub fn deinit(self: *ClientState, alloc: std.mem.Allocator) void {
+        _ = self;
+        // self.write_task.cancel() catch {
+        //     std.debug.print("failed to cancel write task of {}\n", .{self.id});
+        // };
+        // self.read_taks.cancel() catch {
+        //     std.debug.print("failed to cancel read task of {}\n", .{self.id});
+        // };
+        // TODO: dealloc things.
+        _ = alloc;
+    }
+
+    /// Return true if the value was put in the clients buffer to process, else false.
+    pub fn send(self: *ClientState, io: std.Io, msg: Message) std.Io.Cancelable!bool {
+        return (try self.recv_queue.put(io, &.{msg}, 0)) > 0;
+    }
+
+    pub fn next(self: *ClientState, io: std.Io) std.Io.Cancelable!Message {
+        return self.send_queue.getOne(io);
     }
 };
+
+fn writeOk(out: *std.Io.Writer) !void {
+    _ = try out.write("+OK\r\n");
+    try out.flush();
+}
+
+fn writePong(out: *std.Io.Writer) !void {
+    _ = try out.write("PONG\r\n");
+    try out.flush();
+}
+
+pub fn writeInfo(out: *std.Io.Writer, info: Message.ServerInfo) !void {
+    _ = try out.write("INFO ");
+    try std.json.Stringify.value(info, .{}, out);
+    _ = try out.write("\r\n");
+    try out.flush();
+}
+
+fn writeMsg(out: *std.Io.Writer, msg: Message.Msg) !void {
+    std.debug.print("PRINTING MESSAGE\n\n\n\n", .{});
+    try out.print(
+        "MSG {s} {s} {s} {d}\r\n{s}\r\n",
+        .{
+            msg.subject,
+            msg.sid,
+            msg.reply_to orelse "",
+            msg.payload.len,
+            msg.payload,
+        },
+    );
+    try out.flush();
+}

src/server/main.zig

@@ -29,11 +29,30 @@ pub fn main(gpa: std.mem.Allocator, server_config: ServerInfo) !void {
     while (true) : (id +%= 1) {
         if (server.clients.contains(id)) continue;
         const stream = try tcp_server.accept(io);
-        _ = io.async(handleConnection, .{ gpa, io, id, stream, &server });
+        _ = io.async(handleConnection, .{ &server, gpa, io, id, stream });
     }
 }
 
-fn handleConnection(allocator: std.mem.Allocator, io: std.Io, id: usize, stream: std.Io.net.Stream, server: *Server) !void {
+fn addClient(server: *Server, allocator: std.mem.Allocator, id: usize, client: ClientState) !void {
+    // server.clients.lockPointers();
+    try server.clients.put(allocator, id, client);
+    // server.clients.unlockPointers();
+}
+
+fn removeClient(server: *Server, allocator: std.mem.Allocator, id: usize) void {
+    // TODO: implement
+    _ = server;
+    _ = allocator;
+    _ = id;
+}
+
+fn handleConnection(
+    server: *Server,
+    allocator: std.mem.Allocator,
+    io: std.Io,
+    id: usize,
+    stream: std.Io.net.Stream,
+) !void {
     defer stream.close(io);
     var w_buffer: [1024]u8 = undefined;
     var writer = stream.writer(io, &w_buffer);
@@ -43,15 +62,14 @@ fn handleConnection(allocator: std.mem.Allocator, io: std.Io, id: usize, stream:
     var reader = stream.reader(io, &r_buffer);
     const in = &reader.interface;
 
-    writeInfo(out, server.info) catch return;
+    @import("./client.zig").writeInfo(out, server.info) catch return;
     var connect_arena: std.heap.ArenaAllocator = .init(allocator);
     defer connect_arena.deinit();
     const connect = (Message.next(connect_arena.allocator(), in) catch return).connect;
-    var client_state: ClientState = .init(id, connect);
+    var client_state: ClientState = .init(io, allocator, id, connect, in, out);
 
-    // server.clients.lockPointers();
-    try server.clients.put(allocator, id, client_state);
-    // server.clients.unlockPointers();
+    try server.addClient(allocator, id, client_state);
+    defer server.removeClient(allocator, id);
 
     // defer {
     //     server.clients.lockPointers();
@@ -73,91 +91,143 @@ fn handleConnection(allocator: std.mem.Allocator, io: std.Io, id: usize, stream:
     //     server.subscriptions.unlockPointers();
     // }
 
-    processClient(allocator, io, in, out, server, &client_state) catch |err| {
+    server.processClient(allocator, io, &client_state) catch |err| {
         std.debug.panic("Error processing client: {}\n", .{err});
     };
 }
 
-fn processClient(gpa: std.mem.Allocator, io: std.Io, in: *std.Io.Reader, out: *std.Io.Writer, server: *Server, client_state: *ClientState) !void {
-    var parse_task = io.async(parseMessages, .{ gpa, io, in, client_state });
-    defer if (parse_task.cancel(io)) {} else |err| {
-        std.debug.print("Error canceling parse_task for {d}: {any}", .{ client_state.id, err });
-    };
-    var write_task = io.async(writeMessages, .{ io, out, server.*, client_state });
-    defer if (write_task.cancel(io)) {} else |err| {
-        std.debug.print("Error canceling write_task for {d}: {any}", .{ client_state.id, err });
-    };
+// // Result is owned by the caller
+// fn subscribers(server: *Server, gpa: std.mem.Allocator, subject: []const u8) []ClientState {
+//     var acc: std.ArrayList(ClientState) = .empty;
 
-    while (!io.cancelRequested()) {
-        if (client_state.send_queue.getOne(io)) |msg| {
-            switch (msg) {
-                // TODO: REMOVE
-                .not_real => {},
-                // Respond to ping with pong.
-                .ping => {
-                    try client_state.recv_queue.putOne(io, .pong);
-                },
-                .@"pub" => |p| {
-                    std.debug.print("subs (in pub): {any}\n", .{server.subscriptions});
-                    std.debug.print("subs size: {d}\n", .{server.subscriptions.size});
-                    std.debug.print("subs subjects:\n", .{});
-                    var key_iter = server.subscriptions.keyIterator();
-                    while (key_iter.next()) |k| {
-                        std.debug.print("- {s}\n", .{k.*});
-                    } else std.debug.print("<none>\n", .{});
-                    std.debug.print("pub subject: '{s}'\n", .{p.subject});
-                    std.debug.print("pub: {any}\n", .{p});
-                    errdefer _ = client_state.recv_queue.put(io, &.{.@"-err"}, 1) catch {};
-                    // Just publishing to exact matches right now.
-                    // TODO: Publish to pattern matching subjects.
-                    if (server.subscriptions.get(p.subject)) |subs| {
+//     return acc.toOwnedSlice();
+// }
+
+fn publishMessage(server: *Server, io: std.Io, msg: Message.Pub) !void {
+    if (server.subscriptions.get(msg.subject)) |subs| {
         var subs_iter = subs.iterator();
         while (subs_iter.next()) |sub| {
-                            var client = server.clients.get(sub.key_ptr.*) orelse std.debug.panic("Trying to pub to a client that doesn't exist!\n", .{});
-                            std.debug.print("{d} is pubbing to {d}\n", .{ client_state.id, client.id });
-                            if ((try client.recv_queue.put(
-                                io,
-                                &.{
-                                    .{
-                                        .msg = .{
-                                            .subject = p.subject,
-                                            .sid = sub.value_ptr.*,
-                                            .reply_to = p.reply_to,
-                                            .payload = p.payload,
-                                        },
-                                    },
-                                },
-                                0,
-                            )) > 0) {
-                                std.debug.print("published message!\n", .{});
-                            } else {
-                                std.debug.print("skipped publishing for some reason\n", .{});
-                            }
-                        }
-                        try client_state.recv_queue.putOne(io, .@"+ok");
-                    } else {
-                        std.debug.print("no subs with subject\n", .{});
-                    }
-                },
-                .sub => |s| {
-                    var subscribers = try server.subscriptions.getOrPut(gpa, s.subject);
-                    if (!subscribers.found_existing) {
-                        subscribers.value_ptr.* = .empty;
-                    }
-                    try subscribers.value_ptr.*.put(gpa, client_state.id, s.sid);
+            const client_id = sub.key_ptr.*;
+            const sid = sub.value_ptr.*;
 
-                    std.debug.print("subs: {any}\n", .{server.subscriptions});
+            var client = server.clients.getPtr(client_id) orelse {
+                std.debug.print("trying to publish to a client that no longer exists: {d}", .{client_id});
+                continue;
+            };
+
+            _ = try client.send(io, .{ .msg = .{
+                .subject = msg.subject,
+                .sid = sid,
+                .reply_to = msg.reply_to,
+                .payload = msg.payload,
+            } });
+        }
+    } else {
+        std.debug.print("no subs on {s}\n", .{msg.subject});
+    }
+}
+
+fn subscribe(server: *Server, gpa: std.mem.Allocator, id: usize, msg: Message.Sub) !void {
+    var subs_for_subject: std.AutoHashMapUnmanaged(usize, []const u8) = if (server.subscriptions.fetchRemove(msg.subject)) |s| s.value else .empty;
+    try subs_for_subject.put(gpa, id, msg.sid);
+    try server.subscriptions.put(gpa, msg.subject, subs_for_subject);
+}
+
+fn processClient(server: *Server, gpa: std.mem.Allocator, io: std.Io, client_state: *ClientState) !void {
+    defer client_state.deinit(gpa);
+
+    while (true) {
+        switch (try client_state.next(io)) {
+            .ping => {
+                for (0..5) |_| {
+                    if (try client_state.send(io, .pong)) break;
+                } else {
+                    std.debug.print("could not pong to client {}\n", .{client_state.id});
+                }
             },
-                .info => |info| {
-                    std.debug.panic("got an info message? : {any}\n", .{info});
+            .@"pub" => |msg| {
+                try server.publishMessage(io, msg);
+                if (client_state.connect.verbose) {
+                    _ = try client_state.send(io, .@"+ok");
+                }
             },
-                else => |m| {
-                    std.debug.panic("Unimplemented: {any}\n", .{m});
+            .sub => |msg| {
+                try server.subscribe(gpa, client_state.id, msg);
+            },
+            else => |msg| {
+                std.debug.panic("Unimplemented message: {any}\n", .{msg});
             },
         }
-        } else |err| return err;
     }
 
+    // while (!io.cancelRequested()) {
+    //     if (client_state.send_queue.getOne(io)) |msg| {
+    //         switch (msg) {
+    //             // Respond to ping with pong.
+    //             .ping => {
+    //                 try client_state.recv_queue.putOne(io, .pong);
+    //             },
+    //             .@"pub" => |p| {
+    //                 std.debug.print("subs (in pub): {any}\n", .{server.subscriptions});
+    //                 std.debug.print("subs size: {d}\n", .{server.subscriptions.size});
+    //                 std.debug.print("subs subjects:\n", .{});
+    //                 var key_iter = server.subscriptions.keyIterator();
+    //                 while (key_iter.next()) |k| {
+    //                     std.debug.print("- {s}\n", .{k.*});
+    //                 } else std.debug.print("<none>\n", .{});
+    //                 std.debug.print("pub subject: '{s}'\n", .{p.subject});
+    //                 std.debug.print("pub: {any}\n", .{p});
+    //                 errdefer _ = client_state.recv_queue.put(io, &.{.@"-err"}, 1) catch {};
+    //                 // Just publishing to exact matches right now.
+    //                 // TODO: Publish to pattern matching subjects.
+    //                 if (server.subscriptions.get(p.subject)) |subs| {
+    //                     var subs_iter = subs.iterator();
+    //                     while (subs_iter.next()) |sub| {
+    //                         var client = server.clients.get(sub.key_ptr.*) orelse std.debug.panic("Trying to pub to a client that doesn't exist!\n", .{});
+    //                         std.debug.print("{d} is pubbing to {d}\n", .{ client_state.id, client.id });
+    //                         if ((try client.recv_queue.put(
+    //                             io,
+    //                             &.{
+    //                                 .{
+    //                                     .msg = .{
+    //                                         .subject = p.subject,
+    //                                         .sid = sub.value_ptr.*,
+    //                                         .reply_to = p.reply_to,
+    //                                         .payload = p.payload,
+    //                                     },
+    //                                 },
+    //                             },
+    //                             0,
+    //                         )) > 0) {
+    //                             std.debug.print("published message!\n", .{});
+    //                         } else {
+    //                             std.debug.print("skipped publishing for some reason\n", .{});
+    //                         }
+    //                     }
+    //                     try client_state.recv_queue.putOne(io, .@"+ok");
+    //                 } else {
+    //                     std.debug.print("no subs with subject\n", .{});
+    //                 }
+    //             },
+    //             .sub => |s| {
+    //                 var subscribers = try server.subscriptions.getOrPut(gpa, s.subject);
+    //                 if (!subscribers.found_existing) {
+    //                     subscribers.value_ptr.* = .empty;
+    //                 }
+    //                 try subscribers.value_ptr.*.put(gpa, client_state.id, s.sid);
+
+    //                 std.debug.print("subs: {any}\n", .{server.subscriptions});
+    //             },
+    //             .info => |info| {
+    //                 std.debug.panic("got an info message? : {any}\n", .{info});
+    //             },
+    //             else => |m| {
+    //                 std.debug.panic("Unimplemented: {any}\n", .{m});
+    //             },
+    //         }
+    //     } else |err| return err;
+    // }
+
     // while (true) {
     //     switch (next_message) {
     //         .connect => |connect| {
@@ -170,77 +240,6 @@ fn processClient(gpa: std.mem.Allocator, io: std.Io, in: *std.Io.Reader, out: *s
     // }
 }
 
-fn parseMessages(gpa: std.mem.Allocator, io: std.Io, in: *std.Io.Reader, client_state: *ClientState) !void {
-    // var message_parsing_arena: std.heap.ArenaAllocator = .init();
-    // defer message_parsing_arena.deinit();
-    // const message_parsing_allocator = message_parsing_arena.allocator();
-
-    while (!io.cancelRequested()) {
-        // defer _ = message_parsing_arena.reset(.retain_capacity);
-        const next_message = // Message.next(message_parsing_allocator, in)
-            Message.next(gpa, in) catch |err| {
-                switch (err) {
-                    error.EndOfStream => {
-                        break;
-                    },
-                    else => {
-                        return err;
-                    },
-                }
-            };
-        std.debug.print("received message from client {d}: {any}\n'{s}'\n", .{ client_state.id, next_message, in.buffered() });
-        try client_state.send_queue.putOne(io, next_message);
-    }
-}
-
-fn writeMessages(io: std.Io, out: *std.Io.Writer, server: Server, client_state: *ClientState) !void {
-    while (true) {
-        std.debug.print("in writeMessage loop for {d}\n", .{client_state.id});
-        if (client_state.recv_queue.getOne(io)) |msg| {
-            std.debug.print("attempting to write message for {d}: {any}\n", .{ client_state.id, msg });
-            switch (msg) {
-                .@"+ok" => try writeOk(out),
-                .pong => try writePong(out),
-                .info => try writeInfo(out, server.info),
-                .msg => |m| try writeMsg(out, m),
-                else => std.debug.panic("unimplemented write", .{}),
-            }
-        } else |err| return err;
-    }
-}
-
-fn writeOk(out: *std.Io.Writer) !void {
-    _ = try out.write("+OK\r\n");
-    try out.flush();
-}
-
-fn writePong(out: *std.Io.Writer) !void {
-    _ = try out.write("PONG\r\n");
-    try out.flush();
-}
-
-fn writeInfo(out: *std.Io.Writer, info: ServerInfo) !void {
-    _ = try out.write("INFO ");
-    try std.json.Stringify.value(info, .{}, out);
-    _ = try out.write("\r\n");
-    try out.flush();
-}
-
-fn writeMsg(out: *std.Io.Writer, msg: Message.Msg) !void {
-    std.debug.print("PRINTING MESSAGE\n\n\n\n", .{});
-    try out.print(
-        "MSG {s} {s} {s} {d}\r\n{s}\r\n",
-        .{
-            msg.subject,
-            msg.sid,
-            msg.reply_to orelse "",
-            msg.payload.len,
-            msg.payload,
-        },
-    );
-    try out.flush();
-}
-
 pub fn createId() []const u8 {
     return "SERVERID";
 }
@@ -248,7 +247,3 @@ pub fn createId() []const u8 {
 pub fn createName() []const u8 {
     return "SERVERNAME";
 }
-
-// test "handle pub" {
-//     const io = std.testing.io;
-// }

src/server/message_parser.zig

@@ -32,8 +32,6 @@ pub const MessageType = enum {
 };
 
 pub const Message = union(enum) {
-    /// TODO: REMOVE
-    not_real: void,
     info: ServerInfo,
     connect: Connect,
     @"pub": Pub,