52 lines
2.1 KiB
JavaScript
52 lines
2.1 KiB
JavaScript
|
import { streamCollector } from "@smithy/node-http-handler";
|
||
|
|
import { fromArrayBuffer } from "@smithy/util-buffer-from";
|
||
|
|
import { Readable } from "stream";
|
||
|
|
import { TextDecoder } from "util";
|
||
|
|
import { sdkStreamMixin as sdkStreamMixinReadableStream } from "./sdk-stream-mixin.browser";
|
||
|
|
const ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED = "The stream has already been transformed.";
|
||
|
|
export const sdkStreamMixin = (stream) => {
|
||
|
|
if (!(stream instanceof Readable)) {
|
||
|
|
try {
|
||
|
|
return sdkStreamMixinReadableStream(stream);
|
||
|
|
}
|
||
|
|
catch (e) {
|
||
|
|
const name = stream?.__proto__?.constructor?.name || stream;
|
||
|
|
throw new Error(`Unexpected stream implementation, expect Stream.Readable instance, got ${name}`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
let transformed = false;
|
||
|
|
const transformToByteArray = async () => {
|
||
|
|
if (transformed) {
|
||
|
|
throw new Error(ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED);
|
||
|
|
}
|
||
|
|
transformed = true;
|
||
|
|
return await streamCollector(stream);
|
||
|
|
};
|
||
|
|
return Object.assign(stream, {
|
||
|
|
transformToByteArray,
|
||
|
|
transformToString: async (encoding) => {
|
||
|
|
const buf = await transformToByteArray();
|
||
|
|
if (encoding === undefined || Buffer.isEncoding(encoding)) {
|
||
|
|
return fromArrayBuffer(buf.buffer, buf.byteOffset, buf.byteLength).toString(encoding);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
const decoder = new TextDecoder(encoding);
|
||
|
|
return decoder.decode(buf);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
transformToWebStream: () => {
|
||
|
|
if (transformed) {
|
||
|
|
throw new Error(ERR_MSG_STREAM_HAS_BEEN_TRANSFORMED);
|
||
|
|
}
|
||
|
|
if (stream.readableFlowing !== null) {
|
||
|
|
throw new Error("The stream has been consumed by other callbacks.");
|
||
|
|
}
|
||
|
|
if (typeof Readable.toWeb !== "function") {
|
||
|
|
throw new Error("Readable.toWeb() is not supported. Please make sure you are using Node.js >= 17.0.0, or polyfill is available.");
|
||
|
|
}
|
||
|
|
transformed = true;
|
||
|
|
return Readable.toWeb(stream);
|
||
|
|
},
|
||
|
|
});
|
||
|
|
};
|