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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 {
switch (msg) {
.MSG => |m| try self.msg_queue.putOne(io, .{ .MSG = m }),
.HMSG => |m| try self.msg_queue.putOne(io, .{ .HMSG = m }),
else => try self.recv_queue.putOne(io, msg),
}
}
test send {
const io = std.testing.io;
const gpa = std.testing.allocator;
var to_client: std.Io.Writer = .fixed(blk: {
var buf: [1024]u8 = undefined;
break :blk &buf;
});
var recv_queue: Queue(Message) = .init(&.{});
var msgs_queue: Queue(Msgs) = .init(blk: {
var buf: [1]Msgs = undefined;
break :blk &buf;
});
var client: Client = .init(null, gpa, &recv_queue, &msgs_queue, undefined, &to_client);
defer client.deinit(gpa);
var c_task = try io.concurrent(Client.start, .{ &client, io });
defer c_task.cancel(io) catch {};
{
try client.send(io, .PONG);
// Wait for the concurrent client task to write to the writer
try io.sleep(.fromMilliseconds(1), .awake);
try std.testing.expectEqualSlices(u8, "PONG\r\n", to_client.buffered());
}
to_client.end = 0;
{
const payload = "payload";
const msg: Message.Msg = .{
.sid = "1",
.subject = "subject",
.reply_to = "reply",
.payload = .{
.len = payload.len,
.short = blk: {
var buf: [128]u8 = undefined;
@memcpy(buf[0..payload.len], payload);
break :blk buf;
},
.long = null,
},
};
try client.send(io, .{
// msg must be owned by the allocator the client uses
.MSG = try msg.dupe(gpa),
});
try io.sleep(.fromMilliseconds(1), .awake);
try std.testing.expectEqualSlices(u8, "MSG subject 1 reply 7\r\npayload\r\n", to_client.buffered());
}
}
pub fn next(self: *Client, allocator: std.mem.Allocator) !Message {
return Message.next(allocator, self.from_client);
}
test next {
const gpa = std.testing.allocator;
var from_client: std.Io.Reader = .fixed(
"CONNECT {\"verbose\":false,\"pedantic\":false,\"tls_r" ++
"equired\":false,\"name\":\"NATS CLI Version v0.2." ++
"4\",\"lang\":\"go\",\"version\":\"1.43.0\",\"prot" ++
"ocol\":1,\"echo\":true,\"headers\":true,\"no_responders\":true}\r\n" ++
"PING\r\n",
);
var client: Client = .init(null, undefined, undefined, undefined, &from_client, undefined);
{
// Simulate stream
{
const msg = try client.next(gpa);
try std.testing.expectEqual(.CONNECT, std.meta.activeTag(msg));
defer msg.CONNECT.deinit(gpa);
try std.testing.expectEqualDeep(Message{
.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,
},
}, msg);
}
{
const msg = try client.next(gpa);
try std.testing.expectEqual(.PING, std.meta.activeTag(msg));
}
}
}
|
