/
extension.go
131 lines (109 loc) · 3.09 KB
/
extension.go
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package stream
import (
"expvar"
"fmt"
"io"
"go.miragespace.co/heresy/extensions/common"
"go.miragespace.co/heresy/extensions/common/shared"
"go.miragespace.co/heresy/extensions/common/x"
"go.miragespace.co/heresy/polyfill"
"github.com/dop251/goja"
"github.com/dop251/goja_nodejs/eventloop"
)
var (
wrapperNew = expvar.NewInt("readerWrapper.New")
wrapperPut = expvar.NewInt("readerWrapper.Put")
respNew = expvar.NewInt("responseProxy.New")
respPut = expvar.NewInt("responseProxy.Put")
)
type StreamController struct {
eventLoop *eventloop.EventLoop
runtimeWrapper goja.Callable
streamPool *x.Pool[*ReadableStream]
respPool *x.Pool[*ResponseProxy]
}
type ReadableStream struct {
nativeWrapper *NativeReaderWrapper
nativeStream goja.Value
}
func (r *ReadableStream) NativeStream() goja.Value {
return r.nativeStream
}
func NewController(eventLoop *eventloop.EventLoop, symbols *polyfill.RuntimeSymbols) (*StreamController, error) {
s := &StreamController{
eventLoop: eventLoop,
}
setup := make(chan error, 1)
eventLoop.RunOnLoop(func(vm *goja.Runtime) {
_, err := vm.RunProgram(streamWrapperProg)
if err != nil {
setup <- err
return
}
runtimeIOWrapper := vm.Get(streamWrapperSymbol)
wrapper, ok := goja.AssertFunction(runtimeIOWrapper)
if !ok {
setup <- fmt.Errorf("internal error: %s is not a function", streamWrapperSymbol)
return
}
s.runtimeWrapper = wrapper
s.streamPool = x.NewPool[*ReadableStream](x.DefaultPoolCapacity).
WithFactory(func() *ReadableStream {
wrapperNew.Add(1)
wrapper := NewNativeReaderWrapper(vm, s.eventLoop)
return &ReadableStream{
nativeWrapper: wrapper,
}
})
s.respPool = x.NewPool[*ResponseProxy](x.DefaultPoolCapacity).
WithFactory(func() *ResponseProxy {
respNew.Add(1)
return newResponseProxy(vm, s, symbols)
})
setup <- nil
})
err := <-setup
if err != nil {
return nil, err
}
return s, nil
}
func (s *StreamController) GetResponseProxy(t *common.IOContext) *ResponseProxy {
resp := s.respPool.Get()
t.RegisterCleanup(func() {
s.respPool.Put(resp)
respPut.Add(1)
})
return resp
}
func (s *StreamController) NewReadableStreamVM(t *common.IOContext, r io.ReadCloser, vm *goja.Runtime) *ReadableStream {
stream := s.streamPool.Get()
stream.nativeWrapper.WithReader(r)
// unfortunately, ReadableStream itself cannot be reused. we have to create one every time.
fn, err := s.runtimeWrapper(goja.Undefined(), stream.nativeWrapper.NativeObject())
if err != nil {
panic(fmt.Errorf("runtime panic: Failed to get native ReadableStream: %w", err))
}
stream.nativeStream = fn
t.RegisterCleanup(func() {
buf := shared.GetBuffer()
defer shared.PutBuffer(buf)
stream.nativeWrapper.Reset(buf)
stream.nativeStream = nil
s.streamPool.Put(stream)
wrapperPut.Add(1)
})
return stream
}
func AssertReader(native goja.Value, vm *goja.Runtime) (io.Reader, bool) {
obj := native.ToObject(vm)
wrapper := obj.Get("wrapper")
if wrapper == nil {
return nil, false
}
w, ok := wrapper.Export().(*NativeReaderWrapper)
if ok {
return w.Reader(), true
}
return nil, false
}