1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
const std = @import("std");
pub const MessageType = enum {
info,
connect,
@"pub",
hpub,
sub,
unsub,
msg,
hmsg,
ping,
pong,
@"+ok",
@"-err",
fn parseMemEql(input: []const u8) ?MessageType {
// if (std.mem.eql(u8, "INFO", input)) return .info;
if (std.mem.eql(u8, "CONNECT", input)) return .connect;
if (std.mem.eql(u8, "PUB", input)) return .@"pub";
if (std.mem.eql(u8, "HPUB", input)) return .hpub;
if (std.mem.eql(u8, "SUB", input)) return .sub;
if (std.mem.eql(u8, "UNSUB", input)) return .unsub;
// if (std.mem.eql(u8, "MSG", input)) return .msg;
// if (std.mem.eql(u8, "HMSG", input)) return .hmsg;
if (std.mem.eql(u8, "PING", input)) return .ping;
if (std.mem.eql(u8, "PONG", input)) return .pong;
// if (std.mem.eql(u8, "@"+OK"", input)) return .@"+ok";
// if (std.mem.eql(u8, "@"-ERR"", input)) return .@"-err";
return error.InvalidMessageType;
}
const client_types = std.StaticStringMap(MessageType).initComptime(
.{
// {"INFO", .info},
.{ "CONNECT", .connect },
.{ "PUB", .@"pub" },
.{ "HPUB", .hpub },
.{ "SUB", .sub },
.{ "UNSUB", .unsub },
// {"MSG", .msg},
// {"HMSG", .hmsg},
.{ "PING", .ping },
.{ "PONG", .pong },
// {"+OK", .@"+ok"},
// {"-ERR", .@"-err"},
},
);
fn parseStaticStringMap(input: []const u8) ?MessageType {
std.debug.print("input: '{s}'\n", .{input});
return client_types.get(input);
}
pub const parse = parseStaticStringMap;
};
const Message = union(MessageType) {
info: void,
connect: Connect,
@"pub": Pub,
hpub: void,
sub: void,
unsub: void,
msg: void,
hmsg: void,
ping,
pong,
@"+ok": void,
@"-err": void,
const Connect = struct {
verbose: bool = false,
pedantic: bool = false,
tls_required: bool = false,
auth_token: ?[]const u8 = null,
user: ?[]const u8 = null,
pass: ?[]const u8 = null,
name: ?[]const u8 = null,
lang: []const u8,
version: []const u8,
protocol: u32,
echo: ?bool = null,
sig: ?[]const u8 = null,
jwt: ?[]const u8 = null,
no_responders: ?bool = null,
headers: ?bool = null,
nkey: ?[]const u8 = null,
};
const Pub = struct {
subject: []const u8,
reply_to: ?[]const u8,
bytes: usize,
payload: []const u8,
};
};
fn parseJsonMessage(T: type, alloc: std.mem.Allocator, in: *std.Io.Reader) !T {
const slice = try in.takeDelimiterInclusive('}');
return std.json.parseFromSliceLeaky(T, alloc, slice, .{});
}
fn parsePub(in: *std.Io.Reader) !Message.Pub {
const subject = (try in.takeDelimiter(' ')) orelse return error.EndOfStream;
const next = (try in.takeDelimiter(' ')) orelse return error.EndOfStream;
var reply_to: ?[]const u8 = null;
const bytes = std.fmt.parseUnsigned(usize, next, 10) catch blk: {
reply_to = next;
break :blk try std.fmt.parseUnsigned(usize, (try in.takeDelimiter(' ')) orelse return error.EndOfStream, 10);
};
in.toss(2); // CRLF
const payload = try in.take(bytes);
return .{
.subject = subject,
.reply_to = reply_to,
.bytes = bytes,
.payload = payload,
};
}
// try returning error in debug mode, only null in release?
pub fn parseNextMessage(alloc: std.mem.Allocator, in: *std.Io.Reader) ?Message {
const message_type: MessageType = blk: {
const word: []const u8 = (in.takeDelimiter(' ') catch return null) orelse return null;
std.debug.print("word: {s}\n", .{word});
break :blk MessageType.parse(word) orelse return null;
};
defer in.toss(2); // CRLF
return switch (message_type) {
.connect => .{ .connect = parseJsonMessage(Message.Connect, alloc, in) catch return null },
.@"pub" => .{ .@"pub" = parsePub(in) catch return null },
.ping => .{ .ping = {} },
else => null,
};
}
test parseNextMessage {
const input =
\\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
;
var reader: std.Io.Reader = .fixed(input);
var arena: std.heap.ArenaAllocator = .init(std.testing.allocator);
defer arena.deinit();
const gpa = arena.allocator();
const msg: ?Message = parseNextMessage(gpa, &reader);
const expected: ?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,
} };
try std.testing.expect(msg != null);
try std.testing.expectEqualDeep(msg, expected);
}
test "MessageType.parse performance" {
// Measure perf for parseMemEql
// Measure perf for parseStaticStringMap
// assert parse = fastest perf
}
|
