Add Request.signal

Allows aborting a fetch. Improves github integration

src/browser/tests/net/fetch.html

@@ -225,3 +225,17 @@
     URL.revokeObjectURL(blobUrl);
   });
 </script>
+
+<script id=abort>
+  testing.async(async (restore) => {
+    const controller = new AbortController();
+    controller.abort();
+    try {
+      await fetch('http://127.0.0.1:9582/xhr', { signal: controller.signal });
+      testain.fail('fetch should have been aborted');
+    } catch (e) {
+      restore();
+      testing.expectEqual("AbortError", e.name);
+    }
+  });
+</script>

src/browser/webapi/net/Fetch.zig

@@ -28,6 +28,8 @@ const URL = @import("../../URL.zig");
 const Blob = @import("../Blob.zig");
 const Request = @import("Request.zig");
 const Response = @import("Response.zig");
+const AbortSignal = @import("../AbortSignal.zig");
+const DOMException = @import("../DOMException.zig");
 
 const IS_DEBUG = @import("builtin").mode == .Debug;
 
@@ -39,6 +41,7 @@ _buf: std.ArrayList(u8),
 _response: *Response,
 _resolver: js.PromiseResolver.Global,
 _owns_response: bool,
+_signal: ?*AbortSignal,
 
 pub const Input = Request.Input;
 pub const InitOpts = Request.InitOpts;
@@ -47,6 +50,13 @@ pub fn init(input: Input, options: ?InitOpts, page: *Page) !js.Promise {
     const request = try Request.init(input, options, page);
     const resolver = page.js.local.?.createPromiseResolver();
 
+    if (request._signal) |signal| {
+        if (signal._aborted) {
+            resolver.reject("fetch aborted", DOMException.init("The operation was aborted.", "AbortError"));
+            return resolver.promise();
+        }
+    }
+
     if (std.mem.startsWith(u8, request._url, "blob:")) {
         return handleBlobUrl(request._url, resolver, page);
     }
@@ -62,6 +72,7 @@ pub fn init(input: Input, options: ?InitOpts, page: *Page) !js.Promise {
         ._resolver = try resolver.persist(),
         ._response = response,
         ._owns_response = true,
+        ._signal = request._signal,
     };
 
     const http_client = page._session.browser.http_client;
@@ -126,6 +137,12 @@ fn httpStartCallback(transfer: *HttpClient.Transfer) !void {
 fn httpHeaderDoneCallback(transfer: *HttpClient.Transfer) !bool {
     const self: *Fetch = @ptrCast(@alignCast(transfer.ctx));
 
+    if (self._signal) |signal| {
+        if (signal._aborted) {
+            return false;
+        }
+    }
+
     const arena = self._response._arena;
     if (transfer.getContentLength()) |cl| {
         try self._buf.ensureTotalCapacity(arena, cl);
@@ -175,6 +192,14 @@ fn httpHeaderDoneCallback(transfer: *HttpClient.Transfer) !bool {
 
 fn httpDataCallback(transfer: *HttpClient.Transfer, data: []const u8) !void {
     const self: *Fetch = @ptrCast(@alignCast(transfer.ctx));
+
+    // Check if aborted
+    if (self._signal) |signal| {
+        if (signal._aborted) {
+            return error.Abort;
+        }
+    }
+
     try self._buf.appendSlice(self._response._arena, data);
 }
 

src/browser/webapi/net/Request.zig

@@ -25,6 +25,7 @@ const URL = @import("../URL.zig");
 const Page = @import("../../Page.zig");
 const Headers = @import("Headers.zig");
 const Blob = @import("../Blob.zig");
+const AbortSignal = @import("../AbortSignal.zig");
 const Allocator = std.mem.Allocator;
 
 const Request = @This();
@@ -36,6 +37,7 @@ _body: ?[]const u8,
 _arena: Allocator,
 _cache: Cache,
 _credentials: Credentials,
+_signal: ?*AbortSignal,
 
 pub const Input = union(enum) {
     request: *Request,
@@ -48,6 +50,7 @@ pub const InitOpts = struct {
     body: ?[]const u8 = null,
     cache: Cache = .default,
     credentials: Credentials = .@"same-origin",
+    signal: ?*AbortSignal = null,
 };
 
 const Credentials = enum {
@@ -97,6 +100,13 @@ pub fn init(input: Input, opts_: ?InitOpts, page: *Page) !*Request {
         .request => |r| r._body,
     };
 
+    const signal = if (opts.signal) |s|
+        s
+    else switch (input) {
+        .url => null,
+        .request => |r| r._signal,
+    };
+
     return page._factory.create(Request{
         ._url = url,
         ._arena = arena,
@@ -105,6 +115,7 @@ pub fn init(input: Input, opts_: ?InitOpts, page: *Page) !*Request {
         ._cache = opts.cache,
         ._credentials = opts.credentials,
         ._body = body,
+        ._signal = signal,
     });
 }
 
@@ -144,6 +155,10 @@ pub fn getCredentials(self: *const Request) []const u8 {
     return @tagName(self._credentials);
 }
 
+pub fn getSignal(self: *const Request) ?*AbortSignal {
+    return self._signal;
+}
+
 pub fn getHeaders(self: *Request, page: *Page) !*Headers {
     if (self._headers) |headers| {
         return headers;
@@ -200,6 +215,7 @@ pub fn clone(self: *const Request, page: *Page) !*Request {
         ._cache = self._cache,
         ._credentials = self._credentials,
         ._body = self._body,
+        ._signal = self._signal,
     });
 }
 
@@ -218,6 +234,7 @@ pub const JsApi = struct {
     pub const headers = bridge.accessor(Request.getHeaders, null, .{});
     pub const cache = bridge.accessor(Request.getCache, null, .{});
     pub const credentials = bridge.accessor(Request.getCredentials, null, .{});
+    pub const signal = bridge.accessor(Request.getSignal, null, .{});
     pub const blob = bridge.function(Request.blob, .{});
     pub const text = bridge.function(Request.text, .{});
     pub const json = bridge.function(Request.json, .{});