wip3

internal/runtime/standard/fetch.go

@@ -0,0 +1,92 @@
+package standard
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/dop251/goja"
+	"reichard.io/poiesis/internal/runtime/pkg/builtin"
+)
+
+type FetchResult struct {
+	OK      bool
+	Status  int
+	Body    string
+	Headers map[string]string
+}
+
+func Fetch(url string, options map[string]any) (*FetchResult, error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch: %w", err)
+	}
+	defer func() {
+		_ = resp.Body.Close()
+	}()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read body: %w", err)
+	}
+
+	headers := make(map[string]string)
+	for key, values := range resp.Header {
+		if len(values) > 0 {
+			val := values[0]
+			headers[key] = val
+			headers[strings.ToLower(key)] = val
+		}
+	}
+
+	return &FetchResult{
+		OK:      resp.StatusCode >= 200 && resp.StatusCode < 300,
+		Status:  resp.StatusCode,
+		Body:    string(body),
+		Headers: headers,
+	}, nil
+}
+
+func convertFetchResult(vm *goja.Runtime, result *FetchResult) goja.Value {
+	if result == nil {
+		return goja.Null()
+	}
+
+	obj := vm.NewObject()
+	_ = obj.Set("ok", result.OK)
+	_ = obj.Set("status", result.Status)
+	_ = obj.Set("text", func() string {
+		return result.Body
+	})
+
+	headersObj := vm.NewObject()
+	headers := result.Headers
+	_ = headersObj.Set("get", func(c goja.FunctionCall) goja.Value {
+		if len(c.Arguments) < 1 {
+			return goja.Undefined()
+		}
+		key := c.Arguments[0].String()
+		return vm.ToValue(headers[key])
+	})
+	_ = obj.Set("headers", headersObj)
+
+	return obj
+}
+
+func init() {
+	builtin.RegisterCustomConverter(convertFetchResult)
+
+	builtin.RegisterBuiltin("fetch", Fetch)
+	builtin.RegisterBuiltin("add", func(a, b int) int {
+		return a + b
+	})
+	builtin.RegisterBuiltin("greet", func(name string) string {
+		return fmt.Sprintf("Hello, %s!", name)
+	})
+}