Fix server hang on client disconnect

https://github.com/lightpanda-io/browser/issues/425

Add a few integration tests for the TCP server which are fast enough to be run
as part of the unit tests (one of the new tests covers the above issue).

src/browser/browser.zig

@@ -242,7 +242,12 @@ pub const Page = struct {
 
         // add global objects
         log.debug("setup global env", .{});
-        try self.session.env.bindGlobal(&self.session.window);
+
+        if (comptime builtin.is_test == false) {
+            // By not loading this during tests, we aren't required to load
+            // all of the interfaces into zig-js-runtime.
+            try self.session.env.bindGlobal(&self.session.window);
+        }
 
         // load polyfills
         try polyfill.load(self.arena.allocator(), self.session.env);

src/main_tests.zig

@@ -337,12 +337,6 @@ test {
 
     std.testing.refAllDecls(@import("generate.zig"));
     std.testing.refAllDecls(@import("cdp/msg.zig"));
-
-    // Don't use refAllDecls, as this will pull in the entire project
-    // and break the test build.
-    // We should fix this. See this branch & the commit message for details:
-    // https://github.com/karlseguin/browser/commit/193ab5ceab3d3758ea06db04f7690460d79eb79e
-    _ = @import("server.zig");
 }
 
 fn testJSRuntime(alloc: std.mem.Allocator) !void {

src/server.zig

@@ -211,6 +211,13 @@ const Server = struct {
             self.queueClose(client.socket);
             return;
         };
+        if (size == 0) {
+            if (self.client != null) {
+                self.client = null;
+            }
+            self.queueAccept();
+            return;
+        }
 
         const more = client.processData(size) catch |err| {
             log.err("Client Processing Error: {}\n", .{err});
@@ -1053,14 +1060,6 @@ pub fn run(
     timeout: u64,
     loop: *jsruntime.Loop,
 ) !void {
-    if (comptime builtin.is_test) {
-        // There's bunch of code that won't compiler in a test build (because
-        // it relies on a global root.Types). So we fight the compiler and make
-        // sure it doesn't include any of that code. Hopefully one day we can
-        // remove all this.
-        return;
-    }
-
     // create socket
     const flags = posix.SOCK.STREAM | posix.SOCK.CLOEXEC | posix.SOCK.NONBLOCK;
     const listener = try posix.socket(address.any.family, flags, posix.IPPROTO.TCP);
@@ -1631,6 +1630,49 @@ test "server: mask" {
     }
 }
 
+test "server: 404" {
+    var c = try createTestClient();
+    defer c.deinit();
+
+    const res = try c.httpRequest("GET /unknown HTTP/1.1\r\n\r\n");
+    try testing.expectEqualStrings("HTTP/1.1 404 \r\n" ++
+        "Connection: Close\r\n" ++
+        "Content-Length: 9\r\n\r\n" ++
+        "Not found", res);
+}
+
+test "server: get /json/version" {
+    const expected_response =
+        "HTTP/1.1 200 OK\r\n" ++
+        "Content-Length: 48\r\n" ++
+        "Content-Type: application/json; charset=UTF-8\r\n\r\n" ++
+        "{\"webSocketDebuggerUrl\": \"ws://127.0.0.1:9583/\"}";
+
+    {
+        // twice on the same connection
+        var c = try createTestClient();
+        defer c.deinit();
+
+        const res1 = try c.httpRequest("GET /json/version HTTP/1.1\r\n\r\n");
+        try testing.expectEqualStrings(expected_response, res1);
+
+        const res2 = try c.httpRequest("GET /json/version HTTP/1.1\r\n\r\n");
+        try testing.expectEqualStrings(expected_response, res2);
+    }
+
+    {
+        // again on a new connection
+        var c = try createTestClient();
+        defer c.deinit();
+
+        const res1 = try c.httpRequest("GET /json/version HTTP/1.1\r\n\r\n");
+        try testing.expectEqualStrings(expected_response, res1);
+
+        const res2 = try c.httpRequest("GET /json/version HTTP/1.1\r\n\r\n");
+        try testing.expectEqualStrings(expected_response, res2);
+    }
+}
+
 fn assertHTTPError(
     expected_error: HTTPError,
     comptime expected_status: u16,
@@ -1762,3 +1804,63 @@ const MockServer = struct {
         }
     }
 };
+
+fn createTestClient() !TestClient {
+    const address = std.net.Address.initIp4([_]u8{ 127, 0, 0, 1 }, 9583);
+    const stream = try std.net.tcpConnectToAddress(address);
+
+    const timeout = std.mem.toBytes(posix.timeval{
+        .tv_sec = 2,
+        .tv_usec = 0,
+    });
+    try posix.setsockopt(stream.handle, posix.SOL.SOCKET, posix.SO.RCVTIMEO, &timeout);
+    try posix.setsockopt(stream.handle, posix.SOL.SOCKET, posix.SO.SNDTIMEO, &timeout);
+    return .{ .stream = stream };
+}
+
+const TestClient = struct {
+    stream: std.net.Stream,
+    buf: [1024]u8 = undefined,
+
+    fn deinit(self: *TestClient) void {
+        self.stream.close();
+    }
+
+    fn httpRequest(self: *TestClient, req: []const u8) ![]const u8 {
+        try self.stream.writeAll(req);
+
+        var pos: usize = 0;
+        var total_length: ?usize = null;
+        while (true) {
+            pos += try self.stream.read(self.buf[pos..]);
+            const response = self.buf[0..pos];
+            if (total_length == null) {
+                const header_end = std.mem.indexOf(u8, response, "\r\n\r\n") orelse continue;
+                const header = response[0 .. header_end + 4];
+
+                const cl_header = "Content-Length: ";
+                const start = (std.mem.indexOf(u8, header, cl_header) orelse {
+                    return error.MissingContentLength;
+                }) + cl_header.len;
+
+                const end = std.mem.indexOfScalarPos(u8, header, start, '\r') orelse {
+                    return error.InvalidContentLength;
+                };
+                const cl = std.fmt.parseInt(usize, header[start..end], 10) catch {
+                    return error.InvalidContentLength;
+                };
+
+                total_length = cl + header.len;
+            }
+
+            if (total_length) |tl| {
+                if (pos == tl) {
+                    return response;
+                }
+                if (pos > tl) {
+                    return error.DataExceedsContentLength;
+                }
+            }
+        }
+    }
+};

src/unit_tests.zig

@@ -18,10 +18,17 @@
 
 const std = @import("std");
 const builtin = @import("builtin");
+const parser = @import("netsurf");
 
 const Allocator = std.mem.Allocator;
 
+const jsruntime = @import("jsruntime");
+pub const Types = jsruntime.reflect(@import("generate.zig").Tuple(.{}){});
+pub const UserContext = @import("user_context.zig").UserContext;
+// pub const IO = @import("asyncio").Wrapper(jsruntime.Loop);
+
 pub const std_options = std.Options{
+    .log_level = .err,
     .http_disable_tls = true,
 };
 
@@ -31,11 +38,16 @@ const BORDER = "=" ** 80;
 var current_test: ?[]const u8 = null;
 
 pub fn main() !void {
+    try parser.init();
+    defer parser.deinit();
+
     var mem: [8192]u8 = undefined;
     var fba = std.heap.FixedBufferAllocator.init(&mem);
-
     const allocator = fba.allocator();
 
+    var loop = try jsruntime.Loop.init(allocator);
+    defer loop.deinit();
+
     const env = Env.init(allocator);
     defer env.deinit(allocator);
 
@@ -47,12 +59,20 @@ pub fn main() !void {
     var skip: usize = 0;
     var leak: usize = 0;
 
-    const address = try std.net.Address.parseIp("127.0.0.1", 9582);
-    var listener = try address.listen(.{ .reuse_address = true });
-    defer listener.deinit();
-    const http_thread = try std.Thread.spawn(.{}, serverHTTP, .{&listener});
+    const http_thread = blk: {
+        const address = try std.net.Address.parseIp("127.0.0.1", 9582);
+        const thread = try std.Thread.spawn(.{}, serveHTTP, .{address});
+        break :blk thread;
+    };
     defer http_thread.join();
 
+    const cdp_thread = blk: {
+        const address = try std.net.Address.parseIp("127.0.0.1", 9583);
+        const thread = try std.Thread.spawn(.{}, serveCDP, .{ allocator, address, &loop });
+        break :blk thread;
+    };
+    defer cdp_thread.join();
+
     const printer = Printer.init();
     printer.fmt("\r\x1b[0K", .{}); // beginning of line and clear to end of line
 
@@ -98,7 +118,9 @@ pub fn main() !void {
         }
 
         if (result) |_| {
-            pass += 1;
+            if (is_unnamed_test == false) {
+                pass += 1;
+            }
         } else |err| switch (err) {
             error.SkipZigTest => {
                 skip += 1;
@@ -117,11 +139,13 @@ pub fn main() !void {
             },
         }
 
-        if (env.verbose) {
-            const ms = @as(f64, @floatFromInt(ns_taken)) / 1_000_000.0;
-            printer.status(status, "{s} ({d:.2}ms)\n", .{ friendly_name, ms });
-        } else {
-            printer.status(status, ".", .{});
+        if (is_unnamed_test == false) {
+            if (env.verbose) {
+                const ms = @as(f64, @floatFromInt(ns_taken)) / 1_000_000.0;
+                printer.status(status, "{s} ({d:.2}ms)\n", .{ friendly_name, ms });
+            } else {
+                printer.status(status, ".", .{});
+            }
         }
     }
 
@@ -294,7 +318,10 @@ fn isUnnamed(t: std.builtin.TestFn) bool {
     return true;
 }
 
-fn serverHTTP(listener: *std.net.Server) !void {
+fn serveHTTP(address: std.net.Address) !void {
+    var listener = try address.listen(.{ .reuse_address = true });
+    defer listener.deinit();
+
     var read_buffer: [1024]u8 = undefined;
     ACCEPT: while (true) {
         var conn = try listener.accept();
@@ -320,6 +347,14 @@ fn serverHTTP(listener: *std.net.Server) !void {
     }
 }
 
+fn serveCDP(allocator: Allocator, address: std.net.Address, loop: *jsruntime.Loop) !void {
+    const server = @import("server.zig");
+    server.run(allocator, address, std.time.ns_per_s * 2, loop) catch |err| {
+        std.debug.print("CDP server error: {}", .{err});
+        return err;
+    };
+}
+
 const Response = struct {
     body: []const u8 = "",
     status: std.http.Status = .ok,