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Simplified a ton of things and cleaned up ownership

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Robby Zambito
2025-12-31 03:11:42 +00:00
parent 0f138e5984
commit a781876038
3 changed files with 89 additions and 46 deletions
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17
src/server/client.zig
View File

@@ -7,6 +7,8 @@ pub const ClientState = struct {
/// Messages that this client should receive.
recv_queue: std.Io.Queue(Message) = undefined,
recv_queue_buffer: [1024]Message = undefined,
// Used to take ownership of values as they are put in the queue.
recv_alloc: std.mem.Allocator,
from_client: *std.Io.Reader,
to_client: *std.Io.Writer,
@@ -15,11 +17,13 @@ pub const ClientState = struct {
pub fn init(
connect: Message.AllocatedConnect,
alloc: std.mem.Allocator,
in: *std.Io.Reader,
out: *std.Io.Writer,
) !ClientState {
var res: ClientState = .{
.connect = connect,
.recv_alloc = alloc,
.from_client = in,
.to_client = out,
};
@@ -49,6 +53,7 @@ pub const ClientState = struct {
writeInfo(self.to_client, info) catch break;
},
.msg => |m| {
defer m.deinit(self.recv_alloc);
writeMsg(self.to_client, m) catch break;
},
else => {
@@ -68,8 +73,16 @@ pub const ClientState = struct {
}
/// Return true if the value was put in the clients buffer to process, else false.
pub fn send(self: *ClientState, io: std.Io, msg: Message) (std.Io.Cancelable || std.Io.QueueClosedError)!void {
try self.recv_queue.putOne(io, msg);
pub fn send(self: *ClientState, io: std.Io, msg: Message) !void {
// Client needs to own msg that is put in its queue
switch (msg) {
.msg => |m| {
try self.recv_queue.putOne(io, .{ .msg = try m.dupe(self.recv_alloc) });
},
else => {
try self.recv_queue.putOne(io, msg);
},
}
}
pub fn next(self: *ClientState, allocator: std.mem.Allocator) !Message {

90
src/server/main.zig
View File

@@ -5,10 +5,15 @@ pub const ServerInfo = Message.ServerInfo;
const ClientState = @import("./client.zig").ClientState;
const Server = @This();
const Subscription = struct {
subject: []const u8,
client_id: usize,
sid: []const u8,
};
info: ServerInfo,
clients: std.AutoHashMapUnmanaged(usize, *ClientState) = .empty,
/// Map of subjects to a map of (client ID => SID)
subscriptions: std.StringHashMapUnmanaged(std.AutoHashMapUnmanaged(usize, []const u8)) = .empty,
subscriptions: std.ArrayList(Subscription) = .empty,
var keep_running = std.atomic.Value(bool).init(true);
@@ -100,14 +105,19 @@ fn handleConnection(
var connect_arena: std.heap.ArenaAllocator = .init(allocator);
defer connect_arena.deinit();
const connect = (Message.next(connect_arena.allocator(), in) catch return).connect;
var client_state: ClientState = try .init(connect, in, out);
var client_state: ClientState = try .init(connect, allocator, in, out);
try client_state.start(io);
defer client_state.deinit(io, allocator);
try server.addClient(allocator, id, &client_state);
defer server.removeClient(allocator, id);
while (client_state.next(allocator)) |msg| {
var msg_arena: std.heap.ArenaAllocator = .init(allocator);
defer msg_arena.deinit();
const msg_allocator = msg_arena.allocator();
while (client_state.next(msg_allocator)) |msg| {
defer _ = msg_arena.reset(.retain_capacity);
switch (msg) {
.ping => {
// Respond to ping with pong.
@@ -115,10 +125,10 @@ fn handleConnection(
},
.@"pub" => |pb| {
defer {
allocator.free(pb.payload);
allocator.free(pb.subject);
msg_allocator.free(pb.payload);
msg_allocator.free(pb.subject);
if (pb.reply_to) |r| {
allocator.free(r);
msg_allocator.free(r);
}
}
try server.publishMessage(io, pb);
@@ -128,19 +138,19 @@ fn handleConnection(
},
.sub => |sub| {
defer {
allocator.free(sub.subject);
allocator.free(sub.sid);
msg_allocator.free(sub.subject);
msg_allocator.free(sub.sid);
if (sub.queue_group) |q| {
allocator.free(q);
msg_allocator.free(q);
}
}
try server.subscribe(allocator, id, sub);
try server.subscribe(server_allocator, id, sub);
},
.unsub => |unsub| {
defer {
allocator.free(unsub.sid);
msg_allocator.free(unsub.sid);
}
try server.unsubscribe(id, unsub);
try server.unsubscribe(server_allocator, id, unsub);
},
else => |e| {
std.debug.panic("Unimplemented message: {any}\n", .{e});
@@ -161,52 +171,44 @@ fn handleConnection(
// return acc.toOwnedSlice();
// }
fn publishMessage(server: *Server, io: std.Io, msg: Message.Pub) !void {
if (server.subscriptions.get(msg.subject)) |subs| {
var subs_iter = subs.iterator();
while (subs_iter.next()) |sub| {
const client_id = sub.key_ptr.*;
const sid = sub.value_ptr.*;
fn subjectMatches(expected: []const u8, actual: []const u8) bool {
return std.mem.eql(u8, expected, actual);
}
const client = server.clients.getPtr(client_id) orelse {
std.debug.print("trying to publish to a client that no longer exists: {d}", .{client_id});
fn publishMessage(server: *Server, io: std.Io, msg: Message.Pub) !void {
for (server.subscriptions.items) |subscription| {
if (subjectMatches(subscription.subject, msg.subject)) {
const client = server.clients.get(subscription.client_id) orelse {
std.debug.print("trying to publish to a client that no longer exists: {d}", .{subscription.client_id});
continue;
};
_ = try client.*.send(io, .{ .msg = .{
try client.send(io, .{ .msg = .{
.subject = msg.subject,
.sid = sid,
.sid = subscription.sid,
.reply_to = msg.reply_to,
.payload = msg.payload,
} });
}
} else {
std.debug.print("no subs on {s}\n", .{msg.subject});
}
}
fn subscribe(server: *Server, gpa: std.mem.Allocator, id: usize, msg: Message.Sub) !void {
std.debug.print("Recieved SUBSCRIBE message: {any}\n\n", .{msg});
var subs_for_subject: std.AutoHashMapUnmanaged(usize, []const u8) = if (server.subscriptions.fetchRemove(msg.subject)) |s| s.value else .empty;
try subs_for_subject.put(gpa, id, msg.sid);
try server.subscriptions.put(gpa, msg.subject, subs_for_subject);
try server.subscriptions.append(gpa, .{
.subject = try gpa.dupe(u8, msg.subject),
.client_id = id,
.sid = try gpa.dupe(u8, msg.sid),
});
}
fn unsubscribe(server: *Server, id: usize, msg: Message.Unsub) !void {
// Get the subscription in subscriptions by looping over all the subjects,
// and getting the SID for that subject for the current client ID.
// If the SID matches, remove the kv for the client ID from subscriptions for that subject.
// If the value for that subject is empty, remove the subject.
var subscriptions_iter = server.subscriptions.iterator();
while (subscriptions_iter.next()) |*subs_for_sub| {
if (subs_for_sub.value_ptr.get(id)) |client_sub| {
if (std.mem.eql(u8, client_sub, msg.sid)) {
_ = subs_for_sub.value_ptr.*.remove(id);
if (subs_for_sub.value_ptr.count() == 0) {
_ = server.subscriptions.remove(subs_for_sub.key_ptr.*);
}
break;
}
fn unsubscribe(server: *Server, gpa: std.mem.Allocator, id: usize, msg: Message.Unsub) !void {
const len = server.subscriptions.items.len;
for (0..len) |i| {
const sub = server.subscriptions.items[len - i];
if (sub.client_id == id and std.mem.eql(u8, sub.sid, msg.sid)) {
gpa.free(sub.sid);
gpa.free(sub.subject);
_ = server.subscriptions.swapRemove(i);
}
}
}

28
src/server/message_parser.zig
View File

@@ -104,6 +104,12 @@ pub const Message = union(MessageType) {
reply_to: ?[]const u8 = null,
/// The message payload data.
payload: []const u8,
pub fn deinit(self: Pub, alloc: std.mem.Allocator) void {
alloc.free(self.subject);
alloc.free(self.payload);
if (self.reply_to) |r| alloc.free(r);
}
};
pub const Sub = struct {
/// The subject name to subscribe to.
@@ -112,6 +118,12 @@ pub const Message = union(MessageType) {
queue_group: ?[]const u8,
/// A unique alphanumeric subscription ID, generated by the client.
sid: []const u8,
pub fn deinit(self: Sub, alloc: std.mem.Allocator) void {
alloc.free(self.subject);
alloc.free(self.sid);
if (self.queue_group) |q| alloc.free(q);
}
};
pub const Unsub = struct {
/// The unique alphanumeric subscription ID of the subject to unsubscribe from.
@@ -124,6 +136,22 @@ pub const Message = union(MessageType) {
sid: []const u8,
reply_to: ?[]const u8,
payload: []const u8,
pub fn deinit(self: Msg, alloc: std.mem.Allocator) void {
alloc.free(self.subject);
alloc.free(self.sid);
alloc.free(self.payload);
if (self.reply_to) |r| alloc.free(r);
}
pub fn dupe(self: Msg, alloc: std.mem.Allocator) !Msg {
return .{
.subject = try alloc.dupe(u8, self.subject),
.sid = try alloc.dupe(u8, self.sid),
.reply_to = if (self.reply_to) |r| try alloc.dupe(u8, r) else null,
.payload = try alloc.dupe(u8, self.payload),
};
}
};
const client_types = std.StaticStringMap(MessageType).initComptime(