Fix cdp full async

src/server.zig

@@ -17,26 +17,29 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 const std = @import("std");
+const builtin = @import("builtin");
 
 const jsruntime = @import("jsruntime");
 const Completion = jsruntime.IO.Completion;
 const AcceptError = jsruntime.IO.AcceptError;
 const RecvError = jsruntime.IO.RecvError;
 const SendError = jsruntime.IO.SendError;
 const CloseError = jsruntime.IO.CloseError;
+const CancelError = jsruntime.IO.CancelError;
 const TimeoutError = jsruntime.IO.TimeoutError;
 
 const MsgBuffer = @import("msg.zig").MsgBuffer;
 const Browser = @import("browser/browser.zig").Browser;
 const cdp = @import("cdp/cdp.zig");
 
 const NoError = error{NoError};
-const IOError = AcceptError || RecvError || SendError || CloseError || TimeoutError;
+const IOError = AcceptError || RecvError || SendError || CloseError || TimeoutError || CancelError;
 const Error = IOError || std.fmt.ParseIntError || cdp.Error || NoError;
 
 const TimeoutCheck = std.time.ns_per_ms * 100;
 
 const log = std.log.scoped(.server);
+const isLinux = builtin.target.os.tag == .linux;
 
 // I/O Main
 // --------
@@ -55,6 +58,7 @@ pub const Ctx = struct {
     err: ?Error = null,
 
     // I/O fields
+    accept_completion: *Completion,
     conn_completion: *Completion,
     timeout_completion: *Completion,
     timeout: u64,
@@ -76,12 +80,14 @@ pub const Ctx = struct {
         completion: *Completion,
         result: AcceptError!std.posix.socket_t,
     ) void {
-        std.debug.assert(completion == self.conn_completion);
+        std.debug.assert(completion == self.acceptCompletion());
 
         self.conn_socket = result catch |err| {
+            log.err("accept error: {any}", .{err});
             self.err = err;
             return;
         };
+        log.info("client connected", .{});
 
         // set connection timestamp and timeout
         self.last_active = std.time.Instant.now() catch |err| {
@@ -111,6 +117,11 @@ pub const Ctx = struct {
         std.debug.assert(completion == self.conn_completion);
 
         const size = result catch |err| {
+            if (err == error.Canceled) {
+                log.debug("read canceled", .{});
+                return;
+            }
+            log.err("read error: {any}", .{err});
             self.err = err;
             return;
         };
@@ -169,6 +180,7 @@ pub const Ctx = struct {
         std.debug.assert(completion == self.timeout_completion);
 
         _ = result catch |err| {
+            log.err("timeout error: {any}", .{err});
             self.err = err;
             return;
         };
@@ -185,21 +197,9 @@ pub const Ctx = struct {
         };
 
         if (now.since(self.last_active.?) > self.timeout) {
-            // closing
-            log.debug("conn timeout, closing...", .{});
-
-            // NOTE: we should cancel the current read
-            // but it seems that's just closing the connection is enough
-            // (and cancel does not work on MacOS)
-
             // close current connection
-            self.loop.io.close(
-                *Ctx,
-                self,
-                Ctx.closeCbk,
-                self.timeout_completion,
-                self.conn_socket,
-            );
+            log.debug("conn timeout, closing...", .{});
+            self.cancelAndClose();
             return;
         }
 
@@ -213,36 +213,17 @@ pub const Ctx = struct {
         );
     }
 
-    fn closeCbk(self: *Ctx, completion: *Completion, result: CloseError!void) void {
-        _ = completion;
-        // NOTE: completion can be either self.conn_completion or self.timeout_completion
+    fn cancelCbk(self: *Ctx, completion: *Completion, result: CancelError!void) void {
+        std.debug.assert(completion == self.accept_completion);
 
         _ = result catch |err| {
+            log.err("cancel error: {any}", .{err});
             self.err = err;
             return;
         };
+        log.debug("cancel done", .{});
 
-        // conn is closed
-        self.last_active = null;
-
-        // restart a new browser session in case of re-connect
-        if (!self.sessionNew) {
-            self.newSession() catch |err| {
-                log.err("new session error: {any}", .{err});
-                return;
-            };
-        }
-
-        log.info("accepting new conn...", .{});
-
-        // continue accepting incoming requests
-        self.loop.io.accept(
-            *Ctx,
-            self,
-            Ctx.acceptCbk,
-            self.conn_completion,
-            self.accept_socket,
-        );
+        self.close();
     }
 
     // shortcuts
@@ -263,6 +244,15 @@ pub const Ctx = struct {
         return self.browser.session.env;
     }
 
+    inline fn acceptCompletion(self: *Ctx) *Completion {
+        // NOTE: the logical completion to use here is the accept_completion
+        // as the pipe_connection can be used simulteanously by a recv I/O operation.
+        // But on MacOS (kqueue) the recv I/O operation on a closed socket leads to a panic
+        // so we use the pipe_connection to avoid this problem
+        if (isLinux) return self.accept_completion;
+        return self.conn_completion;
+    }
+
     // actions
     // -------
 
@@ -272,13 +262,7 @@ pub const Ctx = struct {
         if (std.mem.eql(u8, cmd, "close")) {
             // close connection
             log.info("close cmd, closing conn...", .{});
-            self.loop.io.close(
-                *Ctx,
-                self,
-                Ctx.closeCbk,
-                self.conn_completion,
-                self.conn_socket,
-            );
+            self.cancelAndClose();
             return error.Closed;
         }
 
@@ -303,6 +287,47 @@ pub const Ctx = struct {
         }
     }
 
+    fn cancelAndClose(self: *Ctx) void {
+        if (isLinux) { // cancel is only available on Linux
+            self.loop.io.cancel(
+                *Ctx,
+                self,
+                Ctx.cancelCbk,
+                self.accept_completion,
+                self.conn_completion,
+            );
+        } else {
+            self.close();
+        }
+    }
+
+    fn close(self: *Ctx) void {
+        std.posix.close(self.conn_socket);
+
+        // conn is closed
+        log.debug("connection closed", .{});
+        self.last_active = null;
+
+        // restart a new browser session in case of re-connect
+        if (!self.sessionNew) {
+            self.newSession() catch |err| {
+                log.err("new session error: {any}", .{err});
+                return;
+            };
+        }
+
+        log.info("accepting new conn...", .{});
+
+        // continue accepting incoming requests
+        self.loop.io.accept(
+            *Ctx,
+            self,
+            Ctx.acceptCbk,
+            self.acceptCompletion(),
+            self.accept_socket,
+        );
+    }
+
     fn newSession(self: *Ctx) !void {
         try self.browser.newSession(self.alloc(), self.loop);
         try self.browser.session.initInspector(
@@ -388,6 +413,7 @@ const Send = struct {
 
     fn asyncCbk(self: *Send, _: *Completion, result: SendError!usize) void {
         _ = result catch |err| {
+            log.err("send error: {any}", .{err});
             self.ctx.err = err;
             return;
         };
@@ -425,6 +451,7 @@ pub fn listen(
     defer msg_buf.deinit(loop.alloc);
 
     // create I/O completions
+    var accept_completion: Completion = undefined;
     var conn_completion: Completion = undefined;
     var timeout_completion: Completion = undefined;
 
@@ -438,6 +465,7 @@ pub fn listen(
         .msg_buf = &msg_buf,
         .accept_socket = server_socket,
         .timeout = timeout,
+        .accept_completion = &accept_completion,
         .conn_completion = &conn_completion,
         .timeout_completion = &timeout_completion,
     };
@@ -449,7 +477,7 @@ pub fn listen(
 
     // accepting connection asynchronously on internal server
     log.info("accepting new conn...", .{});
-    loop.io.accept(*Ctx, &ctx, Ctx.acceptCbk, ctx.conn_completion, ctx.accept_socket);
+    loop.io.accept(*Ctx, &ctx, Ctx.acceptCbk, ctx.acceptCompletion(), ctx.accept_socket);
 
     // infinite loop on I/O events, either:
     // - cmd from incoming connection on server socket