F: add incoming property context

cloudflare/internal/cfruntimecontext/cfruntimecontext.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"errors"
 	"syscall/js"
+
+	"github.com/syumai/workers/internal/cfcontext"
 )
 
 /**
@@ -47,7 +49,7 @@ var ErrValueNotFound = errors.New("execution context value for specified key not
 // GetRuntimeContextValue gets value for specified key from RuntimeContext.
 // - if the value is undefined, return error.
 func GetRuntimeContextValue(ctx context.Context, key string) (js.Value, error) {
-	runtimeCtxValue := cfcontext.MustExtract(ctx)
+	runtimeCtxValue := cfcontext.MustExtractRuntimeContext(ctx)
 	v := runtimeCtxValue.Get(key)
 	if v.IsUndefined() {
 		return js.Value{}, ErrValueNotFound

handler.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"syscall/js"
 
+	"github.com/syumai/workers/internal/cfcontext"
 	"github.com/syumai/workers/internal/jshttp"
 	"github.com/syumai/workers/internal/jsutil"
 )
@@ -48,7 +49,7 @@ func handleRequest(reqObj js.Value, runtimeCtxObj js.Value) (js.Value, error) {
 	if err != nil {
 		panic(err)
 	}
-	ctx := cfcontext.New(context.Background(), runtimeCtxObj)
+	ctx := cfcontext.New(context.Background(), runtimeCtxObj, reqObj.Get("cf"))
 	req = req.WithContext(ctx)
 	reader, writer := io.Pipe()
 	w := &jshttp.ResponseWriter{

internal/cfcontext/context.go

@@ -7,19 +7,33 @@ import (
 )
 
 type runtimeCtxKey struct{}
+type incomingPropertyKey struct{}
 
-func New(ctx context.Context, runtimeCtxObj js.Value) context.Context {
-	return context.WithValue(ctx, runtimeCtxKey{}, runtimeCtxObj)
+func New(ctx context.Context, runtimeCtxObj, incomingPropertyObj js.Value) context.Context {
+	ctx = context.WithValue(ctx, runtimeCtxKey{}, runtimeCtxObj)
+	ctx = context.WithValue(ctx, incomingPropertyKey{}, incomingPropertyObj)
+	return ctx
 }
 
 var ErrRuntimeContextNotFound = errors.New("runtime context was not found")
+var ErrIncomingPropertyNotFound = errors.New("incoming property was not found")
 
-// MustExtract extracts runtime context object from context.
+// MustExtractRuntimeContext extracts runtime context object from context.
 // This function panics when runtime context object was not found.
-func MustExtract(ctx context.Context) js.Value {
+func MustExtractRuntimeContext(ctx context.Context) js.Value {
 	v, ok := ctx.Value(runtimeCtxKey{}).(js.Value)
 	if !ok {
 		panic(ErrRuntimeContextNotFound)
 	}
 	return v
 }
+
+// MustExtractIncomingProperty extracts incoming property object from context.
+// This function panics when incoming property object was not found.
+func MustExtractIncomingProperty(ctx context.Context) js.Value {
+	v, ok := ctx.Value(incomingPropertyKey{}).(js.Value)
+	if !ok {
+		panic(ErrIncomingPropertyNotFound)
+	}
+	return v
+}