WIP: start work on a ip_tcp_client_server test in zig

test/ip_tcp_client_server.zig

@@ -0,0 +1,281 @@
+const std = @import("std");
+const thespian = @import("thespian");
+
+const Allocator = std.mem.Allocator;
+
+const exit_normal = thespian.exit_normal;
+const exit_error = thespian.exit_error;
+const result = thespian.result;
+const unexpected = thespian.unexpected;
+
+const pid = thespian.pid;
+const pid_ref = thespian.pid_ref;
+const self_pid = thespian.self_pid;
+
+const Receiver = thespian.Receiver;
+const spawn_link = thespian.spawn_link;
+
+const message = thespian.message;
+const extract = thespian.extract;
+
+const socket = thespian.socket;
+const tcp_acceptor = thespian.tcp_acceptor;
+const tcp_connector = thespian.tcp_connector;
+const in6addr_loopback = thespian.in6addr_loopback;
+
+pub const std_options = .{
+    .log_level = .err,
+};
+
+const ClientConnection = struct {
+    allocator: Allocator,
+    sock: socket,
+    client_pid: pid,
+    receiver: Receiver(*@This()),
+
+    const Args = struct { allocator: Allocator, fd: i32, client_pid: pid };
+
+    fn start(args: Args) result {
+        const sock = socket.init("client_connection", args.fd) catch |e| return exit_error(e, @errorReturnTrace());
+        var self = args.allocator.create(@This()) catch |e| return exit_error(e, @errorReturnTrace());
+        self.* = .{
+            .allocator = args.allocator,
+            .sock = sock,
+            .client_pid = args.client_pid,
+            .receiver = .init(receive_safe, self),
+        };
+        errdefer self.deinit();
+        self.sock.read() catch |e| return exit_error(e, @errorReturnTrace());
+        thespian.receive(&self.receiver);
+    }
+
+    fn deinit(self: *@This()) void {
+        self.client_pid.deinit();
+        self.allocator.destroy(self);
+    }
+
+    fn receive_safe(self: *@This(), from: pid_ref, m: message) result {
+        errdefer self.deinit();
+        self.receive(from, m) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn receive(self: *@This(), _: pid_ref, m: message) !void {
+        var buf: []const u8 = "";
+        var written: i64 = 0;
+        if (try m.match(.{ "socket", "client_connection", "read_complete", extract(&buf) })) {
+            if (std.mem.eql(u8, buf, "ping"))
+                try self.sock.write("pong");
+        } else if (try m.match(.{ "socket", "client_connection", "write_complete", extract(&written) })) {
+            // just wait for server to close
+        } else if (try m.match(.{ "socket", "client_connection", "closed" })) {
+            // connection done
+            _ = self.client_pid.send(.{ "client_connection", "done" }) catch {};
+            return exit_normal();
+        } else {
+            return unexpected(m);
+        }
+    }
+};
+
+const Client = struct {
+    allocator: Allocator,
+    connector: tcp_connector,
+    server_pid: pid,
+    receiver: Receiver(*@This()),
+
+    const Args = struct { allocator: Allocator, server_pid: pid, port: u16 };
+
+    fn start(args: Args) result {
+        return init(args) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn init(args: Args) !void {
+        const connector: tcp_connector = try .init("client");
+        var self = try args.allocator.create(@This());
+        self.* = .{
+            .allocator = args.allocator,
+            .connector = connector,
+            .server_pid = args.server_pid,
+            .receiver = .init(receive_safe, self),
+        };
+        errdefer self.deinit();
+        try self.connector.connect(in6addr_loopback, args.port);
+        thespian.receive(&self.receiver);
+    }
+
+    fn deinit(self: *@This()) void {
+        self.server_pid.deinit();
+        self.allocator.destroy(self);
+    }
+
+    fn receive_safe(self: *@This(), from: pid_ref, m: message) result {
+        errdefer self.deinit();
+        self.receive(from, m) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn receive(self: *@This(), _: pid_ref, m: message) !void {
+        var fd: i32 = 0;
+        if (try m.match(.{ "connector", "client", "connected", extract(&fd) })) {
+            _ = try spawn_link(self.allocator, ClientConnection.Args{
+                .allocator = self.allocator,
+                .fd = fd,
+                .client_pid = self_pid().clone(),
+            }, ClientConnection.start, "client_connection");
+        } else if (try m.match(.{ "client_connection", "done" })) {
+            _ = try self.server_pid.send(.{ "client", "done" });
+            return exit_normal();
+        } else {
+            return unexpected(m);
+        }
+    }
+};
+
+const ServerConnection = struct {
+    allocator: Allocator,
+    sock: socket,
+    server_pid: pid,
+    receiver: Receiver(*@This()),
+
+    const Args = struct { allocator: Allocator, fd: i32, server_pid: pid };
+
+    fn start(args: Args) result {
+        return init(args) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn init(args: Args) !void {
+        const sock = try socket.init("server_connection", args.fd);
+        var self = try args.allocator.create(@This());
+        self.* = .{
+            .allocator = args.allocator,
+            .sock = sock,
+            .server_pid = args.server_pid,
+            .receiver = .init(receive_safe, self),
+        };
+        errdefer self.deinit();
+        try self.sock.write("ping");
+        thespian.receive(&self.receiver);
+    }
+
+    fn deinit(self: *@This()) void {
+        self.server_pid.deinit();
+        self.allocator.destroy(self);
+    }
+
+    fn receive_safe(self: *@This(), from: pid_ref, m: message) result {
+        errdefer self.deinit();
+        self.receive(from, m) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn receive(self: *@This(), _: pid_ref, m: message) !void {
+        var buf: []const u8 = "";
+        var written: i64 = 0;
+
+        if (try m.match(.{ "socket", "server_connection", "write_complete", extract(&written) })) {
+            // ping sent, start reading
+            try self.sock.read();
+        } else if (try m.match(.{ "socket", "server_connection", "read_complete", extract(&buf) })) {
+            // received pong, close socket
+            if (std.mem.eql(u8, buf, "pong"))
+                try self.sock.close();
+        } else if (try m.match(.{ "socket", "server_connection", "closed" })) {
+            // connection done, notify server
+            _ = self.server_pid.send(.{ "server_connection", "done" }) catch {};
+            return exit_normal();
+        } else {
+            return unexpected(m);
+        }
+    }
+};
+
+const Server = struct {
+    allocator: Allocator,
+    acceptor: tcp_acceptor,
+    client_done: bool = false,
+    server_conn_done: bool = false,
+    acceptor_closed: bool = false,
+    receiver: Receiver(*@This()),
+
+    const Args = struct { allocator: Allocator };
+
+    fn start(args: Args) result {
+        return init(args) catch |e| exit_error(e, @errorReturnTrace());
+    }
+
+    fn init(args: Args) !void {
+        const acceptor: tcp_acceptor = try .init("server");
+        var self = try args.allocator.create(@This());
+        self.* = .{
+            .allocator = args.allocator,
+            .acceptor = acceptor,
+            .receiver = .init(receive_safe, self),
+        };
+        errdefer self.deinit();
+
+        const port = try self.acceptor.listen(in6addr_loopback, 0);
+
+        _ = try spawn_link(args.allocator, Client.Args{
+            .allocator = args.allocator,
+            .server_pid = self_pid().clone(),
+            .port = port,
+        }, Client.start, "client");
+
+        thespian.receive(&self.receiver);
+    }
+
+    fn deinit(self: *@This()) void {
+        self.acceptor.deinit();
+        self.allocator.destroy(self);
+    }
+
+    fn receive_safe(self: *@This(), from: pid_ref, m: message) result {
+        errdefer self.deinit();
+        self.receive(from, m) catch |e| return exit_error(e, @errorReturnTrace());
+    }
+
+    fn receive(self: *@This(), _: pid_ref, m: message) !void {
+        var fd: i32 = 0;
+        if (try m.match(.{ "acceptor", "server", "accept", extract(&fd) })) {
+            _ = try spawn_link(self.allocator, ServerConnection.Args{
+                .allocator = self.allocator,
+                .fd = fd,
+                .server_pid = self_pid().clone(),
+            }, ServerConnection.start, "server_connection");
+            // just one connection for this test
+            try self.acceptor.close();
+        } else if (try m.match(.{ "acceptor", "server", "closed" })) {
+            self.acceptor_closed = true;
+        } else if (try m.match(.{ "client", "done" })) {
+            self.client_done = true;
+        } else if (try m.match(.{ "server_connection", "done" })) {
+            self.server_conn_done = true;
+        } else {
+            return unexpected(m);
+        }
+        if (self.acceptor_closed and self.client_done and self.server_conn_done)
+            return exit_normal();
+    }
+};
+
+test "ip_tcp_client_server test" {
+    const allocator = std.testing.allocator;
+    var ctx = try thespian.context.init(allocator);
+    defer ctx.deinit();
+
+    var success = false;
+
+    var exit_handler = thespian.make_exit_handler(&success, struct {
+        fn handle(ok: *bool, status: []const u8) void {
+            if (std.mem.eql(u8, status, "normal")) {
+                ok.* = true;
+            } else {
+                std.log.err("EXITED: {s}", .{status});
+            }
+        }
+    }.handle);
+
+    _ = try ctx.spawn_link(Server.Args{ .allocator = allocator }, Server.start, "ip_tcp_client_server", &exit_handler, null);
+
+    ctx.run();
+
+    if (!success) return error.TestFailed;
+}