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migrado de js para go

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This commit is contained in:
Luiz Silva 2026-01-01 19:32:29 -03:00
parent 663a8d5bf2
commit 6f78511946
7 changed files with 964 additions and 83 deletions
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7
Dockerfile
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@ -13,6 +13,13 @@ RUN go mod download
COPY . .
# Build do WASM do widget (regras de negócio no cliente)
# Importante: a compilação do WASM exige GOOS=js/GOARCH=wasm.
RUN GOOS=js GOARCH=wasm go build -trimpath -ldflags="-s -w" -o web/static/e-li.nps.wasm ./cmd/widgetwasm
# Copia o runtime JS do Go para WASM (Go class, polyfills)
RUN cp "$(go env GOROOT)/lib/wasm/wasm_exec.js" web/static/wasm_exec.js
# Build do binário
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
go build -trimpath -ldflags="-s -w" -o /out/server ./cmd/server

32
README.md
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@ -27,6 +27,38 @@ O servidor controla o cache de `/static/e-li.nps.js` via **ETag**.
Isso evita problemas de clientes com JS antigo em cache após mudanças.
### WebAssembly (WASM) — regras do widget em Go
O widget `e-li.nps.js` carrega um módulo WASM compilado em Go, para concentrar
as regras de negócio do cliente (pré-validações, cooldown e decisão de abertura
com base na resposta do backend).
Arquivos servidos:
- `/static/e-li.nps.js` (arquivo único do widget)
- `/static/e-li.nps.wasm` (módulo WASM)
- `/static/wasm_exec.js` (runtime do Go para WASM)
Regras importantes:
- **Fail-closed**: se o WASM não carregar, o widget não abre.
- Cache é controlado por **ETag** e o browser sempre **revalida**.
- O backend Go continua sendo a **autoridade** das regras e persistência.
#### Build local do WASM
Para (re)gerar os arquivos do WASM localmente:
```bash
# gera o módulo WASM
GOOS=js GOARCH=wasm go build -o web/static/e-li.nps.wasm ./cmd/widgetwasm
# copia o runtime JS do Go para WASM
cp "$(go env GOROOT)/lib/wasm/wasm_exec.js" web/static/wasm_exec.js
```
> Observação: no build via Docker, esses passos já são executados no `Dockerfile`.
### Arquivo `.env`
O servidor carrega automaticamente um arquivo `.env` na raiz do projeto (se existir) usando `godotenv`.

32
cmd/server/main.go
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@ -92,6 +92,38 @@ func main() {
http.ServeFile(w, r, "web/static/e-li.nps.js")
})
// WASM do widget.
// Regra: cache controlado por ETag e revalidação obrigatória.
// Importante: mantemos o MESMO ETag da inicialização (versaoWidget)
// para JS e WASM, garantindo que ambos "andem juntos".
r.Get("/e-li.nps.wasm", func(w http.ResponseWriter, r *http.Request) {
etag := fmt.Sprintf("\"%s\"", versaoWidget)
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache, must-revalidate")
w.Header().Set("Content-Type", "application/wasm")
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
http.ServeFile(w, r, "web/static/e-li.nps.wasm")
})
// Runtime JS do Go para WASM.
// Também fica sob ETag + revalidação.
r.Get("/wasm_exec.js", func(w http.ResponseWriter, r *http.Request) {
etag := fmt.Sprintf("\"%s\"", versaoWidget)
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache, must-revalidate")
w.Header().Set("Content-Type", "application/javascript")
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
http.ServeFile(w, r, "web/static/wasm_exec.js")
})
r.Handle("/*", http.StripPrefix("/static/", fileServer))
})
// Conveniência: permitir /teste.html

249
cmd/widgetwasm/main.go Normal file
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@ -0,0 +1,249 @@
//go:build js && wasm
package main
import (
"regexp"
"strings"
"syscall/js"
)
// IMPORTANTE (.agent): o backend Go continua sendo a autoridade das regras.
// Este WASM existe para concentrar regras de negócio do widget (cliente) em Go,
// mantendo o arquivo JS pequeno e fácil de auditar.
var dataISORe = regexp.MustCompile(`^([0-9]{4})-([0-9]{2})-([0-9]{2})$`)
type cfgWidget struct {
ProdutoNome string
InquilinoCodigo string
InquilinoNome string
UsuarioCodigo string
UsuarioNome string
UsuarioTelefone string
UsuarioEmail string
CooldownHours float64
DataMinimaAbertura string
}
func main() {
js.Global().Set("__eli_nps_wasm_preflight", js.FuncOf(preflight))
js.Global().Set("__eli_nps_wasm_decidir", js.FuncOf(decidir))
js.Global().Set("__eli_nps_wasm_cooldown_ativo", js.FuncOf(cooldownAtivo))
js.Global().Set("__eli_nps_wasm_set_cooldown", js.FuncOf(setCooldown))
js.Global().Set("__eli_nps_wasm_ready", true)
// Mantém o módulo vivo.
select {}
}
func cooldownAtivo(this js.Value, args []js.Value) any {
if len(args) < 1 {
return false
}
chave := strings.TrimSpace(args[0].String())
if chave == "" {
return false
}
// Best-effort: se der erro, tratamos como não ativo.
storage := js.Global().Get("localStorage")
if storage.IsUndefined() || storage.IsNull() {
return false
}
v := storage.Call("getItem", chave)
if v.IsNull() || v.IsUndefined() {
return false
}
parsed := js.Global().Get("JSON").Call("parse", v)
until := parsed.Get("until")
if until.IsUndefined() || until.IsNull() {
return false
}
agora := js.Global().Get("Date").Call("now").Int()
return int64(agora) < int64(until.Int())
}
func setCooldown(this js.Value, args []js.Value) any {
if len(args) < 2 {
return nil
}
chave := strings.TrimSpace(args[0].String())
if chave == "" {
return nil
}
ateMs := int64(args[1].Int())
if ateMs <= 0 {
return nil
}
storage := js.Global().Get("localStorage")
if storage.IsUndefined() || storage.IsNull() {
return nil
}
obj := js.Global().Get("Object").New()
obj.Set("until", ateMs)
json := js.Global().Get("JSON").Call("stringify", obj)
storage.Call("setItem", chave, json)
return nil
}
func preflight(this js.Value, args []js.Value) any {
if len(args) < 1 {
return map[string]any{"ok": false, "motivo": "sem_cfg"}
}
cfg := lerCfg(args[0])
// Bloqueio por data mínima.
if antesDaDataMinima(cfg.DataMinimaAbertura) {
return map[string]any{"ok": false, "motivo": "antes_da_data_minima"}
}
// controle de exibição: produto + inquilino_codigo + usuario_codigo
if cfg.ProdutoNome == "" || cfg.InquilinoCodigo == "" || cfg.UsuarioCodigo == "" {
return map[string]any{"ok": false, "motivo": "contexto_incompleto"}
}
chaveCooldown := chaveCooldown(cfg.ProdutoNome, cfg.InquilinoCodigo, cfg.UsuarioCodigo)
untilMs := calcularCooldownAteMs(cfg.CooldownHours)
// Enviamos exatamente o produto_nome informado.
payload := map[string]any{
"produto_nome": cfg.ProdutoNome,
"inquilino_codigo": cfg.InquilinoCodigo,
"inquilino_nome": cfg.InquilinoNome,
"usuario_codigo": cfg.UsuarioCodigo,
"usuario_nome": cfg.UsuarioNome,
"usuario_telefone": cfg.UsuarioTelefone,
"usuario_email": normalizarEmail(cfg.UsuarioEmail),
}
return map[string]any{
"ok": true,
"chave_cooldown": chaveCooldown,
"cooldown_ate_ms": untilMs,
"payload": payload,
}
}
func decidir(this js.Value, args []js.Value) any {
// Entrada:
// - args[0] = cfg (para cooldownHours)
// - args[1] = resposta JSON do servidor (obj)
if len(args) < 2 {
return map[string]any{"abrir": false, "motivo": "sem_dados"}
}
cfg := lerCfg(args[0])
data := args[1]
untilMs := calcularCooldownAteMs(cfg.CooldownHours)
// Fail-closed.
if data.IsUndefined() || data.IsNull() {
return map[string]any{"abrir": false, "motivo": "resposta_invalida", "aplicar_cooldown": true, "cooldown_ate_ms": untilMs}
}
// Esperado: {pode_abrir:bool, id:string, produto:string}
podeAbrir := data.Get("pode_abrir")
if !podeAbrir.Truthy() {
return map[string]any{"abrir": false, "motivo": "nao_pode_abrir", "aplicar_cooldown": true, "cooldown_ate_ms": untilMs}
}
id := strings.TrimSpace(data.Get("id").String())
produtoRota := strings.TrimSpace(data.Get("produto").String())
if id == "" || produtoRota == "" {
// Não dá para montar URL segura.
return map[string]any{"abrir": false, "motivo": "sem_produto_ou_id", "aplicar_cooldown": true, "cooldown_ate_ms": untilMs}
}
return map[string]any{
"abrir": true,
"id": id,
"produto_rota": produtoRota,
"aplicar_cooldown": true,
"cooldown_ate_ms": untilMs,
}
}
func lerCfg(v js.Value) cfgWidget {
// Leitura defensiva: tudo é best-effort.
getStr := func(k string) string {
if v.Type() != js.TypeObject {
return ""
}
vv := v.Get(k)
if vv.IsUndefined() || vv.IsNull() {
return ""
}
return strings.TrimSpace(vv.String())
}
getNum := func(k string) float64 {
if v.Type() != js.TypeObject {
return 0
}
vv := v.Get(k)
if vv.IsUndefined() || vv.IsNull() {
return 0
}
return vv.Float()
}
return cfgWidget{
ProdutoNome: getStr("produto_nome"),
InquilinoCodigo: getStr("inquilino_codigo"),
InquilinoNome: getStr("inquilino_nome"),
UsuarioCodigo: getStr("usuario_codigo"),
UsuarioNome: getStr("usuario_nome"),
UsuarioTelefone: getStr("usuario_telefone"),
UsuarioEmail: getStr("usuario_email"),
CooldownHours: getNum("cooldownHours"),
DataMinimaAbertura: getStr("data_minima_abertura"),
}
}
func normalizarEmail(email string) string {
return strings.ToLower(strings.TrimSpace(email))
}
func chaveCooldown(produto, inquilino, usuarioCodigo string) string {
// Prefixo de storage atualizado para o novo nome do projeto.
return "eli-nps:cooldown:" + produto + ":" + inquilino + ":" + usuarioCodigo
}
func calcularCooldownAteMs(hours float64) int64 {
if hours <= 0 {
hours = 24
}
agora := js.Global().Get("Date").Call("now").Int()
return int64(agora) + int64(hours*3600*1000)
}
func antesDaDataMinima(s string) bool {
// Aceita somente ISO (data) YYYY-MM-DD.
v := strings.TrimSpace(s)
if v == "" {
return false
}
m := dataISORe.FindStringSubmatch(v)
if m == nil {
return false
}
// new Date(ano, mes-1, dia, 0, 0, 0, 0)
ano := m[1]
mes := m[2]
dia := m[3]
// Converte para números via JS (simplifica validação e compatibilidade de timezone).
nAno := js.Global().Get("Number").Invoke(ano).Int()
nMes := js.Global().Get("Number").Invoke(mes).Int()
nDia := js.Global().Get("Number").Invoke(dia).Int()
if nAno <= 0 || nMes < 1 || nMes > 12 || nDia < 1 || nDia > 31 {
return false
}
dataMin := js.Global().Get("Date").New(nAno, nMes-1, nDia, 0, 0, 0, 0)
agora := js.Global().Get("Date").New()
return agora.Call("getTime").Int() < dataMin.Call("getTime").Int()
}

146
web/static/e-li.nps.js
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@ -1,4 +1,14 @@
(function(){
// Widget NPS (arquivo único).
//
// Regras do projeto (.agent):
// - sem dependências externas
// - fail-closed
// - contratos públicos estáveis
//
// Evolução: regras de negócio do cliente foram movidas para WASM (Go)
// sempre que possível. O backend continua sendo a autoridade.
const DEFAULTS = {
apiBase: '',
cooldownHours: 24,
@ -8,51 +18,55 @@
data_minima_abertura: '',
};
function parseDataMinima(s){
// Aceita somente ISO (data) YYYY-MM-DD.
// Retorna um Date no início do dia (00:00) no horário local.
const v = String(s || '').trim();
if(!v) return null;
const m = /^([0-9]{4})-([0-9]{2})-([0-9]{2})$/.exec(v);
if(!m) return null;
const ano = Number(m[1]);
const mes = Number(m[2]);
const dia = Number(m[3]);
if(!ano || mes < 1 || mes > 12 || dia < 1 || dia > 31) return null;
return new Date(ano, mes-1, dia, 0, 0, 0, 0);
}
function antesDaDataMinima(cfg){
const d = parseDataMinima(cfg.data_minima_abertura);
if(!d) return false;
return new Date() < d;
}
function normalizeEmail(email){
return String(email || '').trim().toLowerCase();
}
function cooldownKey(produto, inquilino, usuarioCodigo){
// Prefixo de storage atualizado para o novo nome do projeto.
return `eli-nps:cooldown:${produto}:${inquilino}:${usuarioCodigo}`;
}
function nowMs(){ return Date.now(); }
// ------------------------------------------------------------------
// WASM (Go)
// ------------------------------------------------------------------
function withinCooldown(key){
async function carregarWasm(apiBase){
// fail-closed: se o WASM não carregar, o widget não abre.
if(window.__eli_nps_wasm_ready) return true;
if(window.__eli_nps_wasm_loading) return window.__eli_nps_wasm_loading;
window.__eli_nps_wasm_loading = (async function(){
try{
const v = localStorage.getItem(key);
if(!v) return false;
const obj = JSON.parse(v);
return obj && obj.until && nowMs() < obj.until;
}catch(e){ return false; }
// wasm_exec.js expõe global `Go`.
if(!window.Go){
await carregarScript(`${apiBase}/static/wasm_exec.js`);
}
function setCooldown(key, hours){
const go = new Go();
const res = await fetch(`${apiBase}/static/e-li.nps.wasm`, {cache: 'no-cache'});
if(!res.ok) return false;
const bytes = await res.arrayBuffer();
const {instance} = await WebAssembly.instantiate(bytes, go.importObject);
go.run(instance);
return !!window.__eli_nps_wasm_ready;
}catch(e){
return false;
}
})();
return window.__eli_nps_wasm_loading;
}
function carregarScript(src){
return new Promise(function(resolve, reject){
try{
const until = nowMs() + hours*3600*1000;
localStorage.setItem(key, JSON.stringify({until}));
}catch(e){}
const s = document.createElement('script');
s.src = src;
s.async = true;
s.onload = function(){ resolve(); };
s.onerror = function(){ reject(new Error('script_fail')); };
document.head.appendChild(s);
}catch(e){
reject(e);
}
});
}
function createModal(){
@ -133,71 +147,43 @@
init: async function(opts){
const cfg = Object.assign({}, DEFAULTS, opts || {});
// Bloqueio por data mínima (feature flag simples).
// Ex.: não abrir modal antes de 2026-01-01.
if(antesDaDataMinima(cfg)){
return;
}
// Carrega WASM (Go). Sem WASM, não abrimos o widget (fail-closed).
const okWasm = await carregarWasm(cfg.apiBase);
if(!okWasm) return;
// produto_nome pode ser qualquer string (ex.: "e-licencie", "Cachaça & Churras").
// Regra do projeto: o tratamento/normalização de caracteres deve ser feito
// apenas no backend, exclusivamente para nome de tabela/rotas.
const produtoNome = String(cfg.produto_nome || '').trim();
const inquilino = String(cfg.inquilino_codigo || '').trim();
const usuarioCodigo = String(cfg.usuario_codigo || '').trim();
const email = normalizeEmail(cfg.usuario_email);
// Pré-validação e preparação do payload no WASM.
const pre = window.__eli_nps_wasm_preflight(cfg);
if(!pre || !pre.ok) return;
// controle de exibição: produto + inquilino_codigo + usuario_codigo
if(!produtoNome || !inquilino || !usuarioCodigo){
return; // missing required context
}
// A chave do cooldown é “best-effort” e não participa de nenhuma regra
// de segurança. Mantemos o produto como foi informado.
const chaveCooldown = cooldownKey(produtoNome, inquilino, usuarioCodigo);
if(withinCooldown(chaveCooldown)) return;
// Enviamos exatamente o produto_nome informado.
const payload = {
produto_nome: produtoNome,
inquilino_codigo: inquilino,
inquilino_nome: String(cfg.inquilino_nome || '').trim(),
usuario_codigo: usuarioCodigo,
usuario_nome: String(cfg.usuario_nome || '').trim(),
usuario_telefone: String(cfg.usuario_telefone || '').trim(),
usuario_email: email,
};
// Cooldown visual no browser (WASM faz storage best-effort).
// A chave do cooldown é best-effort e não participa de regra de segurança.
if(window.__eli_nps_wasm_cooldown_ativo(pre.chave_cooldown)) return;
let data;
try{
const res = await postJSON(`${cfg.apiBase}/api/e-li.nps/pedido`, payload);
const res = await postJSON(`${cfg.apiBase}/api/e-li.nps/pedido`, pre.payload);
if(!res.ok) return; // fail-closed
data = await res.json();
}catch(e){
return; // fail-closed
}
if(!data || !data.pode_abrir || !data.id){
// small cooldown to avoid flicker if backend keeps rejecting
setCooldown(chaveCooldown, cfg.cooldownHours);
return;
const dec = window.__eli_nps_wasm_decidir(cfg, data);
if(!dec || !dec.abrir){
// cooldown para evitar flicker se o backend seguir rejeitando.
if(dec && dec.aplicar_cooldown){
window.__eli_nps_wasm_set_cooldown(pre.chave_cooldown, dec.cooldown_ate_ms);
}
// Backend can return normalized product; use it for building iframe URL.
const produtoRota = data.produto;
if(!produtoRota){
// fail-closed (não dá pra montar URL segura)
setCooldown(chaveCooldown, cfg.cooldownHours);
return;
}
const modal = createModal();
const iframe = document.createElement('iframe');
iframe.src = `${cfg.apiBase}/e-li.nps/${produtoRota}/${data.id}/form`;
iframe.src = `${cfg.apiBase}/e-li.nps/${dec.produto_rota}/${dec.id}/form`;
modal.panel.appendChild(iframe);
// Visual cooldown so it doesn't keep popping (even if user closes).
setCooldown(chaveCooldown, cfg.cooldownHours);
window.__eli_nps_wasm_set_cooldown(pre.chave_cooldown, dec.cooldown_ate_ms);
}
};
})();

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web/static/e-li.nps.wasm Executable file
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575
web/static/wasm_exec.js Normal file
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@ -0,0 +1,575 @@
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
"use strict";
(() => {
const enosys = () => {
const err = new Error("not implemented");
err.code = "ENOSYS";
return err;
};
if (!globalThis.fs) {
let outputBuf = "";
globalThis.fs = {
constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1, O_DIRECTORY: -1 }, // unused
writeSync(fd, buf) {
outputBuf += decoder.decode(buf);
const nl = outputBuf.lastIndexOf("\n");
if (nl != -1) {
console.log(outputBuf.substring(0, nl));
outputBuf = outputBuf.substring(nl + 1);
}
return buf.length;
},
write(fd, buf, offset, length, position, callback) {
if (offset !== 0 || length !== buf.length || position !== null) {
callback(enosys());
return;
}
const n = this.writeSync(fd, buf);
callback(null, n);
},
chmod(path, mode, callback) { callback(enosys()); },
chown(path, uid, gid, callback) { callback(enosys()); },
close(fd, callback) { callback(enosys()); },
fchmod(fd, mode, callback) { callback(enosys()); },
fchown(fd, uid, gid, callback) { callback(enosys()); },
fstat(fd, callback) { callback(enosys()); },
fsync(fd, callback) { callback(null); },
ftruncate(fd, length, callback) { callback(enosys()); },
lchown(path, uid, gid, callback) { callback(enosys()); },
link(path, link, callback) { callback(enosys()); },
lstat(path, callback) { callback(enosys()); },
mkdir(path, perm, callback) { callback(enosys()); },
open(path, flags, mode, callback) { callback(enosys()); },
read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
readdir(path, callback) { callback(enosys()); },
readlink(path, callback) { callback(enosys()); },
rename(from, to, callback) { callback(enosys()); },
rmdir(path, callback) { callback(enosys()); },
stat(path, callback) { callback(enosys()); },
symlink(path, link, callback) { callback(enosys()); },
truncate(path, length, callback) { callback(enosys()); },
unlink(path, callback) { callback(enosys()); },
utimes(path, atime, mtime, callback) { callback(enosys()); },
};
}
if (!globalThis.process) {
globalThis.process = {
getuid() { return -1; },
getgid() { return -1; },
geteuid() { return -1; },
getegid() { return -1; },
getgroups() { throw enosys(); },
pid: -1,
ppid: -1,
umask() { throw enosys(); },
cwd() { throw enosys(); },
chdir() { throw enosys(); },
}
}
if (!globalThis.path) {
globalThis.path = {
resolve(...pathSegments) {
return pathSegments.join("/");
}
}
}
if (!globalThis.crypto) {
throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
}
if (!globalThis.performance) {
throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
}
if (!globalThis.TextEncoder) {
throw new Error("globalThis.TextEncoder is not available, polyfill required");
}
if (!globalThis.TextDecoder) {
throw new Error("globalThis.TextDecoder is not available, polyfill required");
}
const encoder = new TextEncoder("utf-8");
const decoder = new TextDecoder("utf-8");
globalThis.Go = class {
constructor() {
this.argv = ["js"];
this.env = {};
this.exit = (code) => {
if (code !== 0) {
console.warn("exit code:", code);
}
};
this._exitPromise = new Promise((resolve) => {
this._resolveExitPromise = resolve;
});
this._pendingEvent = null;
this._scheduledTimeouts = new Map();
this._nextCallbackTimeoutID = 1;
const setInt64 = (addr, v) => {
this.mem.setUint32(addr + 0, v, true);
this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
}
const setInt32 = (addr, v) => {
this.mem.setUint32(addr + 0, v, true);
}
const getInt64 = (addr) => {
const low = this.mem.getUint32(addr + 0, true);
const high = this.mem.getInt32(addr + 4, true);
return low + high * 4294967296;
}
const loadValue = (addr) => {
const f = this.mem.getFloat64(addr, true);
if (f === 0) {
return undefined;
}
if (!isNaN(f)) {
return f;
}
const id = this.mem.getUint32(addr, true);
return this._values[id];
}
const storeValue = (addr, v) => {
const nanHead = 0x7FF80000;
if (typeof v === "number" && v !== 0) {
if (isNaN(v)) {
this.mem.setUint32(addr + 4, nanHead, true);
this.mem.setUint32(addr, 0, true);
return;
}
this.mem.setFloat64(addr, v, true);
return;
}
if (v === undefined) {
this.mem.setFloat64(addr, 0, true);
return;
}
let id = this._ids.get(v);
if (id === undefined) {
id = this._idPool.pop();
if (id === undefined) {
id = this._values.length;
}
this._values[id] = v;
this._goRefCounts[id] = 0;
this._ids.set(v, id);
}
this._goRefCounts[id]++;
let typeFlag = 0;
switch (typeof v) {
case "object":
if (v !== null) {
typeFlag = 1;
}
break;
case "string":
typeFlag = 2;
break;
case "symbol":
typeFlag = 3;
break;
case "function":
typeFlag = 4;
break;
}
this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
this.mem.setUint32(addr, id, true);
}
const loadSlice = (addr) => {
const array = getInt64(addr + 0);
const len = getInt64(addr + 8);
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
}
const loadSliceOfValues = (addr) => {
const array = getInt64(addr + 0);
const len = getInt64(addr + 8);
const a = new Array(len);
for (let i = 0; i < len; i++) {
a[i] = loadValue(array + i * 8);
}
return a;
}
const loadString = (addr) => {
const saddr = getInt64(addr + 0);
const len = getInt64(addr + 8);
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
}
const testCallExport = (a, b) => {
this._inst.exports.testExport0();
return this._inst.exports.testExport(a, b);
}
const timeOrigin = Date.now() - performance.now();
this.importObject = {
_gotest: {
add: (a, b) => a + b,
callExport: testCallExport,
},
gojs: {
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
// This changes the SP, thus we have to update the SP used by the imported function.
// func wasmExit(code int32)
"runtime.wasmExit": (sp) => {
sp >>>= 0;
const code = this.mem.getInt32(sp + 8, true);
this.exited = true;
delete this._inst;
delete this._values;
delete this._goRefCounts;
delete this._ids;
delete this._idPool;
this.exit(code);
},
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
"runtime.wasmWrite": (sp) => {
sp >>>= 0;
const fd = getInt64(sp + 8);
const p = getInt64(sp + 16);
const n = this.mem.getInt32(sp + 24, true);
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
},
// func resetMemoryDataView()
"runtime.resetMemoryDataView": (sp) => {
sp >>>= 0;
this.mem = new DataView(this._inst.exports.mem.buffer);
},
// func nanotime1() int64
"runtime.nanotime1": (sp) => {
sp >>>= 0;
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
},
// func walltime() (sec int64, nsec int32)
"runtime.walltime": (sp) => {
sp >>>= 0;
const msec = (new Date).getTime();
setInt64(sp + 8, msec / 1000);
this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
},
// func scheduleTimeoutEvent(delay int64) int32
"runtime.scheduleTimeoutEvent": (sp) => {
sp >>>= 0;
const id = this._nextCallbackTimeoutID;
this._nextCallbackTimeoutID++;
this._scheduledTimeouts.set(id, setTimeout(
() => {
this._resume();
while (this._scheduledTimeouts.has(id)) {
// for some reason Go failed to register the timeout event, log and try again
// (temporary workaround for https://github.com/golang/go/issues/28975)
console.warn("scheduleTimeoutEvent: missed timeout event");
this._resume();
}
},
getInt64(sp + 8),
));
this.mem.setInt32(sp + 16, id, true);
},
// func clearTimeoutEvent(id int32)
"runtime.clearTimeoutEvent": (sp) => {
sp >>>= 0;
const id = this.mem.getInt32(sp + 8, true);
clearTimeout(this._scheduledTimeouts.get(id));
this._scheduledTimeouts.delete(id);
},
// func getRandomData(r []byte)
"runtime.getRandomData": (sp) => {
sp >>>= 0;
crypto.getRandomValues(loadSlice(sp + 8));
},
// func finalizeRef(v ref)
"syscall/js.finalizeRef": (sp) => {
sp >>>= 0;
const id = this.mem.getUint32(sp + 8, true);
this._goRefCounts[id]--;
if (this._goRefCounts[id] === 0) {
const v = this._values[id];
this._values[id] = null;
this._ids.delete(v);
this._idPool.push(id);
}
},
// func stringVal(value string) ref
"syscall/js.stringVal": (sp) => {
sp >>>= 0;
storeValue(sp + 24, loadString(sp + 8));
},
// func valueGet(v ref, p string) ref
"syscall/js.valueGet": (sp) => {
sp >>>= 0;
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 32, result);
},
// func valueSet(v ref, p string, x ref)
"syscall/js.valueSet": (sp) => {
sp >>>= 0;
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
},
// func valueDelete(v ref, p string)
"syscall/js.valueDelete": (sp) => {
sp >>>= 0;
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
},
// func valueIndex(v ref, i int) ref
"syscall/js.valueIndex": (sp) => {
sp >>>= 0;
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
},
// valueSetIndex(v ref, i int, x ref)
"syscall/js.valueSetIndex": (sp) => {
sp >>>= 0;
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
},
// func valueCall(v ref, m string, args []ref) (ref, bool)
"syscall/js.valueCall": (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const m = Reflect.get(v, loadString(sp + 16));
const args = loadSliceOfValues(sp + 32);
const result = Reflect.apply(m, v, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 56, result);
this.mem.setUint8(sp + 64, 1);
} catch (err) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 56, err);
this.mem.setUint8(sp + 64, 0);
}
},
// func valueInvoke(v ref, args []ref) (ref, bool)
"syscall/js.valueInvoke": (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const args = loadSliceOfValues(sp + 16);
const result = Reflect.apply(v, undefined, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, result);
this.mem.setUint8(sp + 48, 1);
} catch (err) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, err);
this.mem.setUint8(sp + 48, 0);
}
},
// func valueNew(v ref, args []ref) (ref, bool)
"syscall/js.valueNew": (sp) => {
sp >>>= 0;
try {
const v = loadValue(sp + 8);
const args = loadSliceOfValues(sp + 16);
const result = Reflect.construct(v, args);
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, result);
this.mem.setUint8(sp + 48, 1);
} catch (err) {
sp = this._inst.exports.getsp() >>> 0; // see comment above
storeValue(sp + 40, err);
this.mem.setUint8(sp + 48, 0);
}
},
// func valueLength(v ref) int
"syscall/js.valueLength": (sp) => {
sp >>>= 0;
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
},
// valuePrepareString(v ref) (ref, int)
"syscall/js.valuePrepareString": (sp) => {
sp >>>= 0;
const str = encoder.encode(String(loadValue(sp + 8)));
storeValue(sp + 16, str);
setInt64(sp + 24, str.length);
},
// valueLoadString(v ref, b []byte)
"syscall/js.valueLoadString": (sp) => {
sp >>>= 0;
const str = loadValue(sp + 8);
loadSlice(sp + 16).set(str);
},
// func valueInstanceOf(v ref, t ref) bool
"syscall/js.valueInstanceOf": (sp) => {
sp >>>= 0;
this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
},
// func copyBytesToGo(dst []byte, src ref) (int, bool)
"syscall/js.copyBytesToGo": (sp) => {
sp >>>= 0;
const dst = loadSlice(sp + 8);
const src = loadValue(sp + 32);
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
// func copyBytesToJS(dst ref, src []byte) (int, bool)
"syscall/js.copyBytesToJS": (sp) => {
sp >>>= 0;
const dst = loadValue(sp + 8);
const src = loadSlice(sp + 16);
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
"debug": (value) => {
console.log(value);
},
}
};
}
async run(instance) {
if (!(instance instanceof WebAssembly.Instance)) {
throw new Error("Go.run: WebAssembly.Instance expected");
}
this._inst = instance;
this.mem = new DataView(this._inst.exports.mem.buffer);
this._values = [ // JS values that Go currently has references to, indexed by reference id
NaN,
0,
null,
true,
false,
globalThis,
this,
];
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
this._ids = new Map([ // mapping from JS values to reference ids
[0, 1],
[null, 2],
[true, 3],
[false, 4],
[globalThis, 5],
[this, 6],
]);
this._idPool = []; // unused ids that have been garbage collected
this.exited = false; // whether the Go program has exited
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
let offset = 4096;
const strPtr = (str) => {
const ptr = offset;
const bytes = encoder.encode(str + "\0");
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
offset += bytes.length;
if (offset % 8 !== 0) {
offset += 8 - (offset % 8);
}
return ptr;
};
const argc = this.argv.length;
const argvPtrs = [];
this.argv.forEach((arg) => {
argvPtrs.push(strPtr(arg));
});
argvPtrs.push(0);
const keys = Object.keys(this.env).sort();
keys.forEach((key) => {
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
});
argvPtrs.push(0);
const argv = offset;
argvPtrs.forEach((ptr) => {
this.mem.setUint32(offset, ptr, true);
this.mem.setUint32(offset + 4, 0, true);
offset += 8;
});
// The linker guarantees global data starts from at least wasmMinDataAddr.
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
const wasmMinDataAddr = 4096 + 8192;
if (offset >= wasmMinDataAddr) {
throw new Error("total length of command line and environment variables exceeds limit");
}
this._inst.exports.run(argc, argv);
if (this.exited) {
this._resolveExitPromise();
}
await this._exitPromise;
}
_resume() {
if (this.exited) {
throw new Error("Go program has already exited");
}
this._inst.exports.resume();
if (this.exited) {
this._resolveExitPromise();
}
}
_makeFuncWrapper(id) {
const go = this;
return function () {
const event = { id: id, this: this, args: arguments };
go._pendingEvent = event;
go._resume();
return event.result;
};
}
}
})();