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const Message = @import("message_parser.zig").Message;
const std = @import("std");
const Queue = std.Io.Queue;
const Client = @This();
pub const Msgs = union(enum) {
MSG: Message.Msg,
HMSG: Message.HMsg,
};
connect: ?Message.Connect,
// Used to own messages that we receive in our queues.
alloc: std.mem.Allocator,
// Messages for this client to receive.
recv_queue: *Queue(Message),
msg_queue: *Queue(Msgs),
from_client: *std.Io.Reader,
to_client: *std.Io.Writer,
pub fn init(
connect: ?Message.Connect,
alloc: std.mem.Allocator,
recv_queue: *Queue(Message),
msg_queue: *Queue(Msgs),
in: *std.Io.Reader,
out: *std.Io.Writer,
) Client {
return .{
.connect = connect,
.alloc = alloc,
.recv_queue = recv_queue,
.msg_queue = msg_queue,
.from_client = in,
.to_client = out,
};
}
pub fn deinit(self: *Client, alloc: std.mem.Allocator) void {
if (self.connect) |c| {
c.deinit(alloc);
}
self.* = undefined;
}
pub fn start(self: *Client, io: std.Io) !void {
var msgs_buf: [1024]Msgs = undefined;
var recv_msgs_task = io.concurrent(Queue(Msgs).get, .{ self.msg_queue, io, &msgs_buf, 1 }) catch @panic("Concurrency unavailable");
errdefer _ = recv_msgs_task.cancel(io) catch {};
var recv_proto_task = io.concurrent(Queue(Message).getOne, .{ self.recv_queue, io }) catch unreachable;
errdefer _ = recv_proto_task.cancel(io) catch {};
while (true) {
switch (try io.select(.{ .msgs = &recv_msgs_task, .proto = &recv_proto_task })) {
.msgs => |len_err| {
@branchHint(.likely);
const msgs = msgs_buf[0..try len_err];
for (0..msgs.len) |i| {
const msg = msgs[i];
defer switch (msg) {
.MSG => |m| m.deinit(self.alloc),
.HMSG => |h| h.deinit(self.alloc),
};
errdefer for (msgs[i + 1 ..]) |mg| switch (mg) {
.MSG => |m| {
m.deinit(self.alloc);
},
.HMSG => |h| {
h.deinit(self.alloc);
},
};
switch (msg) {
.MSG => |m| {
try self.to_client.print(
"MSG {s} {s} {s} {d}\r\n",
.{
m.subject,
m.sid,
m.reply_to orelse "",
m.payload.len,
},
);
try m.payload.write(self.to_client);
try self.to_client.print("\r\n", .{});
},
.HMSG => |hmsg| {
try self.to_client.print("HMSG {s} {s} {s} {d} {d}\r\n", .{
hmsg.msg.subject,
hmsg.msg.sid,
hmsg.msg.reply_to orelse "",
hmsg.header_bytes,
hmsg.msg.payload.len,
});
try hmsg.msg.payload.write(self.to_client);
try self.to_client.print("\r\n", .{});
},
}
}
recv_msgs_task = io.concurrent(Queue(Msgs).get, .{ self.msg_queue, io, &msgs_buf, 1 }) catch unreachable;
},
.proto => |msg_err| {
@branchHint(.unlikely);
const msg = try msg_err;
switch (msg) {
.@"+OK" => {
_ = try self.to_client.write("+OK\r\n");
},
.PONG => {
_ = try self.to_client.write("PONG\r\n");
},
.INFO => |info| {
_ = try self.to_client.write("INFO ");
try std.json.Stringify.value(info, .{}, self.to_client);
_ = try self.to_client.write("\r\n");
},
.@"-ERR" => |s| {
_ = try self.to_client.print("-ERR '{s}'\r\n", .{s});
},
else => |m| {
std.debug.panic("unimplemented write: {any}\n", .{m});
},
}
recv_proto_task = io.concurrent(Queue(Message).getOne, .{ self.recv_queue, io }) catch unreachable;
},
}
try self.to_client.flush();
}
}
pub fn send(self: *Client, io: std.Io, msg: Message) !void {
try self.recv_queue.putOne(io, msg);
}
pub fn next(self: *Client, allocator: std.mem.Allocator) !Message {
return Message.next(allocator, self.from_client);
}
test {
const io = std.testing.io;
const gpa = std.testing.allocator;
var from_client: std.Io.Reader = .fixed(
"CONNECT {\"verbose\":false,\"pedantic\":false,\"tls_required\":false,\"name\":\"NATS CLI Version v0.2.4\",\"lang\":\"go\",\"version\":\"1.43.0\",\"protocol\":1,\"echo\":true,\"headers\":true,\"no_responders\":true}\r\n" ++
"PING\r\n",
);
var from_client_buf: [1024]Message = undefined;
var from_client_queue: std.Io.Queue(Message) = .init(&from_client_buf);
{
// Simulate stream
while (Message.next(gpa, &from_client)) |msg| {
try from_client_queue.putOne(io, msg);
} else |err| switch (err) {
error.EndOfStream => from_client_queue.close(io),
else => return err,
}
while (from_client_queue.getOne(io)) |msg| {
switch (msg) {
.connect => |*c| {
std.debug.print("Message: {any}\n", .{msg});
c.deinit(gpa);
},
else => {
std.debug.print("Message: {any}\n", .{msg});
},
}
} else |_| {}
}
from_client_queue = .init(&from_client_buf);
// Reset the reader to process it again.
from_client.seek = 0;
// {
// const SemiClient = struct {
// q: std.Io.Queue(Message),
// fn parseClientInput(self: *@This(), ioh: std.Io, in: *std.Io.Reader) void {
// defer std.debug.print("done parse\n", .{});
// while (Message.next(gpa, in)) |msg| {
// self.q.putOne(ioh, msg) catch return;
// } else |_| {}
// }
// fn next(self: *@This(), ioh: std.Io) !Message {
// return self.q.getOne(ioh);
// }
// fn printAll(self: *@This(), ioh: std.Io) void {
// defer std.debug.print("done print\n", .{});
// while (self.next(ioh)) |*msg| {
// std.debug.print("Client msg: {any}\n", .{msg});
// switch (msg.*) {
// .connect => |c| {
// c.deinit(gpa);
// },
// else => {},
// }
// } else |_| {}
// }
// };
// var c: SemiClient = .{ .q = from_client_queue };
// var group: std.Io.Group = .init;
// defer group.wait(io);
// group.concurrent(io, SemiClient.printAll, .{ &c, io }) catch {
// @panic("could not start printAll\n");
// };
// group.concurrent(io, SemiClient.parseClientInput, .{ &c, io, &from_client }) catch {
// @panic("could not start printAll\n");
// };
// }
////////
// const connect = (Message.next(gpa, &from_client) catch unreachable).connect;
// var to_client_alloc: std.Io.Writer.Allocating = .init(gpa);
// defer to_client_alloc.deinit();
// var to_client = to_client_alloc.writer;
// var client: ClientState = try .init(io, gpa, 0, connect, &from_client, &to_client);
// defer client.deinit(gpa);
// {
// var get_next = io.concurrent(ClientState.next, .{ &client, io }) catch unreachable;
// defer if (get_next.cancel(io)) |_| {} else |_| @panic("fail");
// var timeout = io.concurrent(std.Io.sleep, .{ io, .fromMilliseconds(1000), .awake }) catch unreachable;
// defer timeout.cancel(io) catch {};
// switch (try io.select(.{
// .get_next = &get_next,
// .timeout = &timeout,
// })) {
// .get_next => |next| {
// std.debug.print("next is {any}\n", .{next});
// try std.testing.expect((next catch |err| return err) == .ping);
// },
// .timeout => {
// std.debug.print("reached timeout\n", .{});
// return error.TestUnexpectedResult;
// },
// }
// }
}
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