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// Copyright 2018-2025 the Deno authors. MIT license.
import { toByteStream } from "@std/streams/unstable-to-byte-stream";
import { encodeCbor } from "./encode_cbor.ts";
import { CborSequenceEncoderStream } from "./sequence_encoder_stream.ts";
import type { CborMapStreamInput } from "./types.ts";
/**
* A {@link TransformStream} that encodes a
* {@link ReadableStream<CborMapStreamInput>} into CBOR "Indefinite Length Map".
* [RFC 8949 - Concise Binary Object Representation (CBOR)](https://datatracker.ietf.org/doc/html/rfc8949)
*
* @example Usage
* ```ts
* import { assert, assertEquals } from "@std/assert";
* import {
* CborMapDecodedStream,
* CborMapEncoderStream,
* CborSequenceDecoderStream,
* } from "@std/cbor";
*
* const rawMessage: Record<string, number> = {
* a: 0,
* b: 1,
* c: 2,
* d: 3,
* };
*
* for await (
* const value of ReadableStream.from(Object.entries(rawMessage))
* .pipeThrough(new CborMapEncoderStream)
* .pipeThrough(new CborSequenceDecoderStream())
* ) {
* assert(value instanceof CborMapDecodedStream);
* for await (const [k, v] of value) {
* assertEquals(rawMessage[k], v);
* }
* }
* ```
*/
export class CborMapEncoderStream
implements TransformStream<CborMapStreamInput, Uint8Array> {
#readable: ReadableStream<Uint8Array>;
#writable: WritableStream<CborMapStreamInput>;
/**
* Constructs a new instance.
*/
constructor() {
const { readable, writable } = new TransformStream<
CborMapStreamInput,
CborMapStreamInput
>();
this.#readable = toByteStream(ReadableStream.from(async function* () {
yield new Uint8Array([0b101_11111]);
for await (const [k, v] of readable) {
yield encodeCbor(k);
for await (const x of CborSequenceEncoderStream.from([v]).readable) {
yield x;
}
}
yield new Uint8Array([0b111_11111]);
}()));
this.#writable = writable;
}
/**
* Creates a {@link CborMapEncoderStream} instance from an iterable of
* {@link CborMapStreamInput} chunks.
*
* @example Usage
* ```ts
* import { assert, assertEquals } from "@std/assert";
* import {
* CborMapDecodedStream,
* CborMapEncoderStream,
* CborSequenceDecoderStream,
* } from "@std/cbor";
*
* const rawMessage: Record<string, number> = {
* a: 0,
* b: 1,
* c: 2,
* d: 3,
* };
*
* for await (
* const value of CborMapEncoderStream.from(Object.entries(rawMessage))
* .readable
* .pipeThrough(new CborSequenceDecoderStream())
* ) {
* assert(value instanceof CborMapDecodedStream);
* for await (const [k, v] of value) {
* assertEquals(rawMessage[k], v);
* }
* }
* ```
*
* @param asyncIterable The value to encode of type
* {@link AsyncIterable<CborMapStreamInput>} or
* {@link Iterable<CborMapStreamInput>}.
* @returns A {@link CborMapEncoderStream} instance of the encoded data.
*/
static from(
asyncIterable:
| AsyncIterable<CborMapStreamInput>
| Iterable<CborMapStreamInput>,
): CborMapEncoderStream {
const encoder = new CborMapEncoderStream();
ReadableStream.from(asyncIterable).pipeTo(encoder.writable);
return encoder;
}
/**
* The {@link ReadableStream<Uint8Array>} associated with the instance, which
* provides the encoded CBOR data as {@link Uint8Array} chunks.
*
* @example Usage
* ```ts
* import { assert, assertEquals } from "@std/assert";
* import {
* CborMapDecodedStream,
* CborMapEncoderStream,
* CborSequenceDecoderStream,
* } from "@std/cbor";
*
* const rawMessage: Record<string, number> = {
* a: 0,
* b: 1,
* c: 2,
* d: 3,
* };
*
* for await (
* const value of ReadableStream.from(Object.entries(rawMessage))
* .pipeThrough(new CborMapEncoderStream)
* .pipeThrough(new CborSequenceDecoderStream())
* ) {
* assert(value instanceof CborMapDecodedStream);
* for await (const [k, v] of value) {
* assertEquals(rawMessage[k], v);
* }
* }
* ```
*
* @returns A {@link ReadableStream<Uint8Array>}.
*/
get readable(): ReadableStream<Uint8Array> {
return this.#readable;
}
/**
* The {@link WritableStream<CborMapStreamInput>} associated with the
* instance, which accepts {@link CborMapStreamInput} chunks to be encoded
* into CBOR format.
*
* @example Usage
* ```ts
* import { assert, assertEquals } from "@std/assert";
* import {
* CborMapDecodedStream,
* CborMapEncoderStream,
* CborSequenceDecoderStream,
* } from "@std/cbor";
*
* const rawMessage: Record<string, number> = {
* a: 0,
* b: 1,
* c: 2,
* d: 3,
* };
*
* for await (
* const value of ReadableStream.from(Object.entries(rawMessage))
* .pipeThrough(new CborMapEncoderStream)
* .pipeThrough(new CborSequenceDecoderStream())
* ) {
* assert(value instanceof CborMapDecodedStream);
* for await (const [k, v] of value) {
* assertEquals(rawMessage[k], v);
* }
* }
* ```
*
* @returns A {@link WritableStream<CborMapStreamInput>}.
*/
get writable(): WritableStream<CborMapStreamInput> {
return this.#writable;
}
}
|