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renderer.go
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package wx
import (
"encoding/json"
"fmt"
"io"
"strings"
v8 "github.com/apack/wx/internal/js/v8"
"github.com/apack/wx/internal/ssr"
)
type ViewDOM struct {
FileName string
Script []byte
}
type ViewCSS struct {
FileName string
Style []byte
}
type ViewSSR struct {
Script []byte
}
type View interface {
Name() string
DOM() *ViewDOM
CSS() *ViewCSS
SSR() *ViewSSR
}
type Renderer struct {
view View
vm *v8.VM
ssr *ssr.SSR
}
type Props map[string]interface{}
func NewRenderer(view View) (*Renderer, error) {
vm, err := v8.Load()
if err != nil {
return nil, err
}
ssr, err := ssr.Load(vm, string(view.SSR().Script))
if err != nil {
return nil, err
}
return &Renderer{
view: view,
vm: vm,
ssr: ssr,
}, nil
}
func (r *Renderer) Close() error {
r.vm.Close()
return nil
}
type ssrResult struct {
HEAD string
HTML string
}
func (r *Renderer) Render(props Props) ([]byte, error) {
var dst ssrResult
err := r.ssr.Execute(&dst, props)
if err != nil {
return nil, err
}
propsJSON, err := json.Marshal(props)
if err != nil {
return nil, err
}
html := `<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="/styles/` + r.view.CSS().FileName + `">
` + dst.HEAD + `
</head>
<body>
<div id="app">
` + dst.HTML + `
</div>
<script src="/scripts/` + r.view.DOM().FileName + `"></script>
<script>
var view = new __dom__.default({
target: document.getElementById('app'),
hydrate: true,
props: ` + string(propsJSON) + `,
});
</script>
</body>
</html>`
return []byte(html), nil
}
type ViewRegistry interface {
RegisterViews(views ...View) error
}
type closable interface {
Close() error
}
func makePool[T io.Closer](size int, createFn func() (T, error)) (*pool[T], error) {
p := &pool[T]{
slots: make(chan T, size),
}
for i := 0; i < size; i++ {
v, err := createFn()
if err != nil {
return nil, err
}
p.slots <- v
}
return p, nil
}
type pool[T io.Closer] struct {
slots chan T
}
func (p *pool[T]) get() T {
return <-p.slots
}
func (p *pool[T]) put(v T) {
p.slots <- v
}
func (p *pool[T]) Close() error {
var errs = make([]error, 0)
for len(p.slots) > 0 {
v := <-p.slots
err := v.Close()
if err != nil {
errs = append(errs, err)
}
}
if l := len(errs); l > 0 {
var strArr []string
for _, err := range errs {
strArr = append(strArr, err.Error())
}
return fmt.Errorf("wx: failed to close %d pool workers:: [%v]", l, strings.Join(strArr, ";"))
}
close(p.slots)
return nil
}
type RenderWorker struct {
pool *pool[*Renderer]
}
func NewRenderWorker(view View) (*RenderWorker, error) {
pool, err := makePool(4, func() (*Renderer, error) {
r, err := NewRenderer(view)
if err != nil {
return nil, err
}
return r, nil
})
if err != nil {
return nil, err
}
return &RenderWorker{
pool: pool,
}, nil
}
func (w *RenderWorker) Render(props Props) ([]byte, error) {
r := w.pool.get()
defer w.pool.put(r)
html, err := r.Render(props)
return html, err
}
func (w *RenderWorker) Close() error {
return w.pool.Close()
}
type RenderEngine struct {
wm map[View]*RenderWorker
}
func (e *RenderEngine) Close() {
for _, w := range e.wm {
w.Close()
}
}
func NewRenderEngine() *RenderEngine {
return &RenderEngine{
wm: make(map[View]*RenderWorker),
}
}
func (e *RenderEngine) RegisterViews(views ...View) error {
var err error
for _, view := range views {
if view == nil {
return fmt.Errorf("wx: view is nil")
}
if _, ok := e.wm[view]; ok {
return fmt.Errorf("wx: view %s already registered", view.Name())
}
e.wm[view], err = NewRenderWorker(view)
if err != nil {
return err
}
}
return nil
}
func (e *RenderEngine) Render(view View, props Props) ([]byte, error) {
w, ok := e.wm[view]
if !ok {
return nil, fmt.Errorf("wx: view %q is not registered", view.Name())
}
return w.Render(props)
}