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const {
PromiseResolve,
} = primordials;
const {
ERR_INVALID_ARG_TYPE,
ERR_WEBASSEMBLY_RESPONSE,
} = require('internal/errors').codes;
let undici;
function lazyUndici() {
return undici ??= require('internal/deps/undici/undici');
}
// This is essentially an implementation of a v8::WasmStreamingCallback, except
// that it is implemented in JavaScript because the fetch() implementation is
// difficult to use from C++. See lib/internal/process/pre_execution.js and
// src/node_wasm_web_api.cc that interact with this function.
function wasmStreamingCallback(streamState, source) {
(async () => {
const response = await PromiseResolve(source);
if (!(response instanceof lazyUndici().Response)) {
throw new ERR_INVALID_ARG_TYPE(
'source', ['Response', 'Promise resolving to Response'], response);
}
const contentType = response.headers.get('Content-Type');
if (contentType !== 'application/wasm') {
throw new ERR_WEBASSEMBLY_RESPONSE(
`has unsupported MIME type '${contentType}'`);
}
if (!response.ok) {
throw new ERR_WEBASSEMBLY_RESPONSE(
`has status code ${response.status}`);
}
if (response.bodyUsed !== false) {
throw new ERR_WEBASSEMBLY_RESPONSE('body has already been used');
}
if (response.url) {
streamState.setURL(response.url);
}
// Pass all data from the response body to the WebAssembly compiler.
const { body } = response;
if (body != null) {
for await (const chunk of body) {
streamState.push(chunk);
}
}
})().then(() => {
// No error occurred. Tell the implementation that the stream has ended.
streamState.finish();
}, (err) => {
// An error occurred, either because the given object was not a valid
// and usable Response or because a network error occurred.
streamState.abort(err);
});
}
module.exports = {
wasmStreamingCallback
};
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