src/main.zig

@@ -2,6 +2,8 @@ const std = @import("std");
 const zits = @import("zits");
 const clap = @import("clap");
 
+const MessageType = zits.MessageParser.MessageType;
+
 const SubCommands = enum {
     help,
     serve,
@@ -135,12 +137,12 @@ fn handleConnection(io: std.Io, stream: std.Io.net.Stream, info: ServerInfo) voi
     var writer = stream.writer(io, &w_buffer);
     const out = &writer.interface;
 
-    var r_buffer: [1024]u8 = undefined;
+    var r_buffer: [8192]u8 = undefined;
     var reader = stream.reader(io, &r_buffer);
     const in = &reader.interface;
 
     processClient(in, out, info) catch |err| {
-        std.debug.print("Error processing client: {}\n", .{err});
+        std.debug.panic("Error processing client: {}\n", .{err});
     };
 
     // var stdout_buffer: [1024]u8 = undefined;
@@ -171,102 +173,36 @@ fn handleConnection(io: std.Io, stream: std.Io.net.Stream, info: ServerInfo) voi
 fn processClient(in: *std.Io.Reader, out: *std.Io.Writer, info: ServerInfo) !void {
     try writeInfo(out, info);
 
-    const ClientState = struct {
+    const initial_message_type = MessageType.parse((in.takeDelimiter(' ') catch return error.InvalidMessageType) orelse "") orelse return error.InvalidMessageType;
-        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 MessageType = enum {
-        info,
-        connect,
-        @"pub",
-        hpub,
-        sub,
-        unsub,
-        msg,
-        hmsg,
-        ping,
-        pong,
-        @"+ok",
-        @"-err",
-
-        // fn parse(input: []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(@This()).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 parse(input: []u8) !@This() {
-            return client_types.get(input) orelse return error.InvalidMessageType;
-        }
-    };
-
-    const initial_message_type = try MessageType.parse((in.takeDelimiter(' ') catch return error.InvalidMessageType) orelse return error.InvalidMessageType);
     if (initial_message_type != .connect) return error.InvalidMessageType;
 
     // move this inside client_state declaration
-    var json_parse_buf: [1024]u8 = undefined;
+    var json_parse_buf: [4096]u8 = undefined;
     var json_parse_alloc_fb: std.heap.FixedBufferAllocator = std.heap.FixedBufferAllocator.init(&json_parse_buf);
     var json_parse_alloc = json_parse_alloc_fb.allocator();
     var json_reader: std.json.Reader = .init(json_parse_alloc, in);
 
     std.debug.print("buffered:{s}\n", .{in.buffered()});
 
-    var client_state = try std.json.parseFromTokenSourceLeaky(ClientState, json_parse_alloc, &json_reader, .{});
+    // var client_state = try std.json.parseFromSliceLeaky(ClientState, json_parse_alloc, in.buffered(), .{});
+    // in.toss(in.buffered().len);
 
-    std.debug.print("client_state: {any}\n", .{client_state});
+    // var client_state = try std.json.parseFromTokenSourceLeaky(ClientState, json_parse_alloc, &json_reader, .{});
+
+    const client_state = 0;
+    std.debug.print("client_state: {}\n", .{client_state});
 
     while (true) {
         // Rebase the next message to the start of the buffer
         // in.rebase(in.buffer.len);
-        const next_message_type = try MessageType.parse((in.takeDelimiter(' ') catch return error.InvalidMessageType) orelse return error.InvalidMessageType);
+        const next_message_type = MessageType.parse((in.takeDelimiter(' ') catch return error.InvalidMessageType) orelse "") orelse return error.InvalidMessageType;
 
         switch (next_message_type) {
             .connect => {
                 json_parse_alloc_fb = std.heap.FixedBufferAllocator.init(&json_parse_buf);
                 json_parse_alloc = json_parse_alloc_fb.allocator();
                 json_reader = .init(json_parse_alloc, in);
-                client_state = try std.json.parseFromTokenSourceLeaky(ClientState, json_parse_alloc, &json_reader, .{});
+                // client_state = try std.json.parseFromTokenSourceLeaky(ClientState, json_parse_alloc, &json_reader, .{});
                 std.debug.print("client_state: {any}\n", .{client_state});
             },
             else => |msg| std.debug.print("received {}\n", .{msg}),

src/root.zig

@@ -1,23 +1 @@
-//! By convention, root.zig is the root source file when making a library.
+pub const MessageParser = @import("server/message_parser.zig");
-const std = @import("std");
-
-pub fn bufferedPrint() !void {
-    // Stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    var stdout_buffer: [1024]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writer(&stdout_buffer);
-    const stdout = &stdout_writer.interface;
-
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
-
-    try stdout.flush(); // Don't forget to flush!
-}
-
-pub fn add(a: i32, b: i32) i32 {
-    return a + b;
-}
-
-test "basic add functionality" {
-    try std.testing.expect(add(3, 7) == 10);
-}

src/server/client.zig

@@ -0,0 +1,18 @@
+const ClientState = 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,
+};

src/server/message_parser.zig

@@ -0,0 +1,168 @@
+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 {
+    var json_reader: std.json.Reader = .init(alloc, in);
+    defer json_reader.deinit();
+
+    return std.json.parseFromTokenSourceLeaky(T, alloc, &json_reader, .{});
+}
+
+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}
+    ;
+    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
+}