hackathon/web_src/lib/pb/fetch.pb.ts

/* eslint-disable */
// @ts-nocheck
/*
 * This file is a generated Typescript file for GRPC Gateway, DO NOT MODIFY
 */

export interface InitReq extends RequestInit {
	pathPrefix?: string;
}

export function fetchReq<I, O>(path: string, init?: InitReq): Promise<O> {
	const { pathPrefix, ...req } = init || {};

	const url = pathPrefix ? `${pathPrefix}${path}` : path;

	return fetch(url, req).then((r) =>
		r.json().then((body: O) => {
			if (!r.ok) {
				throw body;
			}
			return body;
		})
	) as Promise<O>;
}

// NotifyStreamEntityArrival is a callback that will be called on streaming entity arrival
export type NotifyStreamEntityArrival<T> = (resp: T) => void;

/**
 * fetchStreamingRequest is able to handle grpc-gateway server side streaming call
 * it takes NotifyStreamEntityArrival that lets users respond to entity arrival during the call
 * all entities will be returned as an array after the call finishes.
 **/
export async function fetchStreamingRequest<S, R>(
	path: string,
	callback?: NotifyStreamEntityArrival<R>,
	init?: InitReq
) {
	const { pathPrefix, ...req } = init || {};
	const url = pathPrefix ? `${pathPrefix}${path}` : path;
	const result = await fetch(url, req);
	// needs to use the .ok to check the status of HTTP status code
	// http other than 200 will not throw an error, instead the .ok will become false.
	// see https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#
	if (!result.ok) {
		const resp = await result.json();
		const errMsg = resp.error && resp.error.message ? resp.error.message : '';
		throw new Error(errMsg);
	}

	if (!result.body) {
		throw new Error('response doesnt have a body');
	}

	await result.body
		.pipeThrough(new TextDecoderStream())
		.pipeThrough<R>(getNewLineDelimitedJSONDecodingStream<R>())
		.pipeTo(
			getNotifyEntityArrivalSink((e: R) => {
				if (callback) {
					callback(e);
				}
			})
		);

	// wait for the streaming to finish and return the success respond
	return;
}

/**
 * JSONStringStreamController represents the transform controller that's able to transform the incoming
 * new line delimited json content stream into entities and able to push the entity to the down stream
 */
interface JSONStringStreamController<T> extends TransformStreamDefaultController {
	buf?: string;
	pos?: number;
	enqueue: (s: T) => void;
}

/**
 * getNewLineDelimitedJSONDecodingStream returns a TransformStream that's able to handle new line delimited json stream content into parsed entities
 */
function getNewLineDelimitedJSONDecodingStream<T>(): TransformStream<string, T> {
	return new TransformStream({
		start(controller: JSONStringStreamController<T>) {
			controller.buf = '';
			controller.pos = 0;
		},

		transform(chunk: string, controller: JSONStringStreamController<T>) {
			if (controller.buf === undefined) {
				controller.buf = '';
			}
			if (controller.pos === undefined) {
				controller.pos = 0;
			}
			controller.buf += chunk;
			while (controller.pos < controller.buf.length) {
				if (controller.buf[controller.pos] === '\n') {
					const line = controller.buf.substring(0, controller.pos);
					const response = JSON.parse(line);
					controller.enqueue(response.result);
					controller.buf = controller.buf.substring(controller.pos + 1);
					controller.pos = 0;
				} else {
					++controller.pos;
				}
			}
		}
	});
}

/**
 * getNotifyEntityArrivalSink takes the NotifyStreamEntityArrival callback and return
 * a sink that will call the callback on entity arrival
 * @param notifyCallback
 */
function getNotifyEntityArrivalSink<T>(notifyCallback: NotifyStreamEntityArrival<T>) {
	return new WritableStream<T>({
		write(entity: T) {
			notifyCallback(entity);
		}
	});
}

type Primitive = string | boolean | number;
type RequestPayload = Record<string, unknown>;
type FlattenedRequestPayload = Record<string, Primitive | Array<Primitive>>;

/**
 * Checks if given value is a plain object
 * Logic copied and adapted from below source:
 * https://github.com/char0n/ramda-adjunct/blob/master/src/isPlainObj.js
 * @param  {unknown} value
 * @return {boolean}
 */
function isPlainObject(value: unknown): boolean {
	const isObject = Object.prototype.toString.call(value).slice(8, -1) === 'Object';
	const isObjLike = value !== null && isObject;

	if (!isObjLike || !isObject) {
		return false;
	}

	const proto = Object.getPrototypeOf(value);

	const hasObjectConstructor =
		typeof proto === 'object' && proto.constructor === Object.prototype.constructor;

	return hasObjectConstructor;
}

/**
 * Checks if given value is of a primitive type
 * @param  {unknown} value
 * @return {boolean}
 */
function isPrimitive(value: unknown): boolean {
	return ['string', 'number', 'boolean'].some((t) => typeof value === t);
}

/**
 * Checks if given primitive is zero-value
 * @param  {Primitive} value
 * @return {boolean}
 */
function isZeroValuePrimitive(value: Primitive): boolean {
	return value === false || value === 0 || value === '';
}

/**
 * Flattens a deeply nested request payload and returns an object
 * with only primitive values and non-empty array of primitive values
 * as per https://github.com/googleapis/googleapis/blob/master/google/api/http.proto
 * @param  {RequestPayload} requestPayload
 * @param  {String} path
 * @return {FlattenedRequestPayload>}
 */
function flattenRequestPayload<T extends RequestPayload>(
	requestPayload: T,
	path: string = ''
): FlattenedRequestPayload {
	return Object.keys(requestPayload).reduce((acc: T, key: string): T => {
		const value = requestPayload[key];
		const newPath = path ? [path, key].join('.') : key;

		const isNonEmptyPrimitiveArray =
			Array.isArray(value) && value.every((v) => isPrimitive(v)) && value.length > 0;

		const isNonZeroValuePrimitive = isPrimitive(value) && !isZeroValuePrimitive(value as Primitive);

		let objectToMerge = {};

		if (isPlainObject(value)) {
			objectToMerge = flattenRequestPayload(value as RequestPayload, newPath);
		} else if (isNonZeroValuePrimitive || isNonEmptyPrimitiveArray) {
			objectToMerge = { [newPath]: value };
		}

		return { ...acc, ...objectToMerge };
	}, {} as T) as FlattenedRequestPayload;
}

/**
 * Renders a deeply nested request payload into a string of URL search
 * parameters by first flattening the request payload and then removing keys
 * which are already present in the URL path.
 * @param  {RequestPayload} requestPayload
 * @param  {string[]} urlPathParams
 * @return {string}
 */
export function renderURLSearchParams<T extends RequestPayload>(
	requestPayload: T,
	urlPathParams: string[] = []
): string {
	const flattenedRequestPayload = flattenRequestPayload(requestPayload);

	const urlSearchParams = Object.keys(flattenedRequestPayload).reduce(
		(acc: string[][], key: string): string[][] => {
			// key should not be present in the url path as a parameter
			const value = flattenedRequestPayload[key];
			if (urlPathParams.find((f) => f === key)) {
				return acc;
			}
			return Array.isArray(value)
				? [...acc, ...value.map((m) => [key, m.toString()])]
				: (acc = [...acc, [key, value.toString()]]);
		},
		[] as string[][]
	);

	return new URLSearchParams(urlSearchParams).toString();
}