F: add fetch (wip)

cloudflare/fetch/client.go

@@ -0,0 +1,24 @@
+package fetch
+
+import (
+	"net/http"
+	"syscall/js"
+
+	"github.com/syumai/workers/internal/jsutil"
+)
+
+// Client is an HTTP client.
+type Client struct {
+	*http.Client
+
+	// namespace - Objects that Fetch API belongs to. Default is Global
+	namespace js.Value
+}
+
+// NewClient returns new Client
+func NewClient() *Client {
+	return &Client{
+		Client:    &http.Client{},
+		namespace: jsutil.Global,
+	}
+}

cloudflare/fetch/http.go

@@ -0,0 +1,22 @@
+package fetch
+
+import (
+	"net/http"
+
+	"github.com/syumai/workers/internal/jshttp"
+	"github.com/syumai/workers/internal/jsutil"
+)
+
+// Do sends an HTTP request and returns an HTTP response
+func (c *Client) Do(req *Request) (*http.Response, error) {
+	jsReq := jshttp.ToJSRequest(req.Request)
+
+	init := jsutil.NewObject()
+	promise := c.namespace.Call("fetch2", jsReq, init)
+	jsRes, err := jsutil.AwaitPromise(promise)
+	if err != nil {
+		return nil, err
+	}
+
+	return jshttp.ToResponse(jsRes)
+}

cloudflare/fetch/request.go

@@ -0,0 +1,25 @@
+package fetch
+
+import (
+	"context"
+	"io"
+	"net/http"
+)
+
+// Request represents an HTTP request and is part of the Fetch API.
+// Docs: https://developers.cloudflare.com/workers/runtime-apis/request/
+type Request struct {
+	*http.Request
+}
+
+// NewRequest returns new Request given a method, URL, and optional body
+func NewRequest(ctx context.Context, method string, url string, body io.Reader) (*Request, error) {
+	req, err := http.NewRequestWithContext(ctx, method, url, body)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Request{
+		Request: req,
+	}, nil
+}