Fix parse errors, ownership errors.

src/server/main.zig

@@ -10,6 +10,11 @@ const Subscription = struct {
     subject: []const u8,
     client_id: usize,
     sid: []const u8,
+
+    fn deinit(self: Subscription, alloc: std.mem.Allocator) void {
+        alloc.free(self.subject);
+        alloc.free(self.sid);
+    }
 };
 
 info: ServerInfo,
@@ -29,12 +34,10 @@ pub fn deinit(server: *Server, io: std.Io, alloc: std.mem.Allocator) void {
     server.subs_lock.lockUncancelable(io);
     defer server.subs_lock.unlock(io);
     for (server.subscriptions.items) |sub| {
-        alloc.free(sub.sid);
-        alloc.free(sub.subject);
+        sub.deinit(alloc);
     }
-    server.subscriptions.shrinkAndFree(alloc, 0);
-
-    server.clients.clearAndFree(alloc);
+    server.subscriptions.deinit(alloc);
+    server.clients.deinit(alloc);
 }
 
 pub fn main(alloc: std.mem.Allocator, server_config: ServerInfo) !void {
@@ -118,8 +121,7 @@ fn removeClient(server: *Server, io: std.Io, allocator: std.mem.Allocator, id: u
             const i = len - from_end - 1;
             const sub = server.subscriptions.items[i];
             if (sub.client_id == id) {
-                allocator.free(sub.sid);
-                allocator.free(sub.subject);
+                sub.deinit(allocator);
                 _ = server.subscriptions.swapRemove(i);
             }
         }
@@ -205,9 +207,11 @@ fn handleConnection(
                 try server.publishMessage(io, server_allocator, &client, msg);
             },
             .sub => |sub| {
+                defer sub.deinit(server_allocator);
                 try server.subscribe(io, server_allocator, id, sub);
             },
             .unsub => |unsub| {
+                defer unsub.deinit(server_allocator);
                 try server.unsubscribe(io, server_allocator, id, unsub);
             },
             .connect => |connect| {
@@ -313,10 +317,14 @@ fn publishMessage(server: *Server, io: std.Io, alloc: std.mem.Allocator, source_
 fn subscribe(server: *Server, io: std.Io, gpa: std.mem.Allocator, id: usize, msg: Message.Sub) !void {
     try server.subs_lock.lock(io);
     defer server.subs_lock.unlock(io);
+    const subject = try gpa.dupe(u8, msg.subject);
+    errdefer gpa.free(subject);
+    const sid = try gpa.dupe(u8, msg.sid);
+    errdefer gpa.free(sid);
     try server.subscriptions.append(gpa, .{
-        .subject = msg.subject,
+        .subject = subject,
         .client_id = id,
-        .sid = msg.sid,
+        .sid = sid,
     });
 }
 
@@ -328,8 +336,7 @@ fn unsubscribe(server: *Server, io: std.Io, gpa: std.mem.Allocator, id: usize, m
         const i = len - from_end - 1;
         const sub = server.subscriptions.items[i];
         if (sub.client_id == id and std.mem.eql(u8, sub.sid, msg.sid)) {
-            gpa.free(sub.sid);
-            gpa.free(sub.subject);
+            sub.deinit(gpa);
             _ = server.subscriptions.swapRemove(i);
         }
     }

src/server/message_parser.zig

@@ -235,8 +235,6 @@ pub const Message = union(enum) {
             break :blk .initBuffer(&buf);
         };
 
-        std.log.debug("buffered: '{s}'", .{in.buffered()});
-
         while (in.peekByte()) |byte| {
             if (std.ascii.isUpper(byte)) {
                 try operation_string.appendBounded(byte);
@@ -362,6 +360,7 @@ fn parseSub(alloc: std.mem.Allocator, in: *std.Io.Reader) !Message {
             }
             try third.?.append(alloc, byte);
             in.toss(1);
+            continue :sw .in_third;
         },
         .in_end => {
             try expectStreamBytes(in, "\r\n");
@@ -453,49 +452,86 @@ test parseSub {
             res,
         );
     }
+    {
+        var in: std.Io.Reader = .fixed(" foo.echo q 10\r\n");
+        var res = try parseSub(std.testing.allocator, &in);
+        defer res.sub.deinit(std.testing.allocator);
+        try std.testing.expectEqualDeep(
+            Message{
+                .sub = .{
+                    .subject = "foo.echo",
+                    .queue_group = "q",
+                    .sid = "10",
+                },
+            },
+            res,
+        );
+    }
 }
 
 fn parseUnsub(alloc: std.mem.Allocator, in: *std.Io.Reader) !Message {
-    try in.discardAll(1); // throw away space
+    const States = enum {
+        before_first,
+        in_first,
+        after_first,
+        in_second,
+        in_end,
+    };
+
     var first: std.ArrayList(u8) = .empty;
     errdefer first.deinit(alloc);
+    var second: ?std.ArrayList(u8) = null;
+    defer if (second) |*s| s.deinit(alloc);
 
-    while (in.peekByte()) |byte| {
-        if (std.ascii.isWhitespace(byte)) break;
+    sw: switch (@as(States, .before_first)) {
+        .before_first => {
+            const byte = try in.peekByte();
+            if (std.ascii.isWhitespace(byte)) {
+                in.toss(1);
+                continue :sw .before_first;
+            }
+            continue :sw .in_first;
+        },
+        .in_first => {
+            const byte = try in.peekByte();
+            if (!std.ascii.isWhitespace(byte)) {
                 try first.append(alloc, byte);
                 in.toss(1);
-    } else |err| return err;
-
-    while (in.peekByte()) |byte| {
-        if (!std.ascii.isWhitespace(byte) or byte == '\r') break;
-        in.toss(1);
-    } else |err| return err;
-
-    if (try in.peekByte() == '\r') {
-        try expectStreamBytes(in, "\r\n");
-        return .{
-            .unsub = .{
-                .sid = try first.toOwnedSlice(alloc),
-            },
-        };
-    } else {
-        var second: std.ArrayList(u8) = .empty;
-        defer second.deinit(alloc);
-
-        while (in.peekByte()) |byte| {
-            if (std.ascii.isWhitespace(byte)) break;
-            try second.append(alloc, byte);
-            in.toss(1);
-        } else |err| return err;
-
-        try expectStreamBytes(in, "\r\n");
-        return .{
-            .unsub = .{
-                .max_msgs = try std.fmt.parseUnsigned(usize, second.items, 10),
-                .sid = try first.toOwnedSlice(alloc),
-            },
-        };
+                continue :sw .in_first;
             }
+            continue :sw .after_first;
+        },
+        .after_first => {
+            const byte = try in.peekByte();
+            if (byte == '\r') {
+                continue :sw .in_end;
+            } else if (std.ascii.isWhitespace(byte)) {
+                in.toss(1);
+                continue :sw .after_first;
+            }
+            second = .empty;
+            continue :sw .in_second;
+        },
+        .in_second => {
+            const byte = try in.peekByte();
+            if (byte == '\r') {
+                continue :sw .in_end;
+            }
+            try second.?.append(alloc, byte);
+            in.toss(1);
+            continue :sw .in_second;
+        },
+        .in_end => {
+            try expectStreamBytes(in, "\r\n");
+        },
+    }
+
+    return .{
+        .unsub = .{
+            .sid = try first.toOwnedSlice(alloc),
+            .max_msgs = if (second) |s| try std.fmt.parseUnsigned(usize, s.items, 10) else null,
+        },
+    };
 }
 
 test parseUnsub {