seyfert/packages/discordeno/rest/sendRequest.ts

import { HTTPResponseCodes } from "../types/shared.ts";
import { BASE_URL } from "../util/constants.ts";
import { RequestMethod } from "./rest.ts";
import { RestManager } from "./restManager.ts";

export interface RestSendRequestOptions {
    url: string;
    method: RequestMethod;
    bucketId?: string;
    reject?: Function;
    respond?: Function;
    retryCount?: number;
    payload?: {
        headers: Record<string, string>;
        body: string | FormData;
    };
}

export async function sendRequest<T>(rest: RestManager, options: RestSendRequestOptions): Promise<T> {
   try {
        // CUSTOM HANDLER FOR USER TO LOG OR WHATEVER WHENEVER A FETCH IS MADE
        rest.debug(`[REST - fetching] URL: ${options.url} | ${JSON.stringify(options)}`);

        const newURL = options.url.startsWith(BASE_URL) ? options.url : `${BASE_URL}/v${rest.version}/${options.url}`;

        rest.debug(`[REST - url data] URL: ${newURL}`);

        const response = await fetch(
            new Request(newURL, {
                method: options.method,
                headers: options.payload?.headers,
                body: options.payload?.body,
            }),
        );

        rest.debug(`[REST - fetched] URL: ${options.url} | ${JSON.stringify(options)}`);

        const bucketIdFromHeaders = rest.processRequestHeaders(
            rest,
            rest.simplifyUrl(options.url, options.method),
            response.headers,
        );
        // SET THE BUCKET Id IF IT WAS PRESENT
        if (bucketIdFromHeaders) {
            options.bucketId = bucketIdFromHeaders;
        }

        if (response.status < 200 || response.status >= 400) {
            rest.debug(
                `[REST - httpError] Payload: ${JSON.stringify(options)} | Response: ${JSON.stringify(response)}`,
            );

            let error = "REQUEST_UNKNOWN_ERROR";
            switch (response.status) {
                case HTTPResponseCodes.BadRequest:
                    error = "The options was improperly formatted, or the server couldn't understand it.";
                    break;
                case HTTPResponseCodes.Unauthorized:
                    error = "The Authorization header was missing or invalid.";
                    break;
                case HTTPResponseCodes.Forbidden:
                    error = "The Authorization token you passed did not have permission to the resource.";
                    break;
                case HTTPResponseCodes.NotFound:
                    error = "The resource at the location specified doesn't exist.";
                    break;
                case HTTPResponseCodes.MethodNotAllowed:
                    error = "The HTTP method used is not valid for the location specified.";
                    break;
                case HTTPResponseCodes.GatewayUnavailable:
                    error = "There was not a gateway available to process your options. Wait a bit and retry.";
                    break;
            }

            if (
                rest.invalidRequestErrorStatuses.includes(response.status) &&
                !(response.status === 429 && response.headers.get("X-RateLimit-Scope"))
            ) {
                // INCREMENT CURRENT INVALID REQUESTS
                ++rest.invalidRequests;

                if (!rest.invalidRequestsTimeoutId) {
                    rest.invalidRequestsTimeoutId = setTimeout(() => {
                        rest.debug(`[REST - processGlobalQueue] Resetting invalid optionss counter in setTimeout.`);
                        rest.invalidRequests = 0;
                        rest.invalidRequestsTimeoutId = 0;
                    }, rest.invalidRequestsInterval);
                }
            }

            // If NOT rate limited remove from queue
            if (response.status !== 429) {
                options.reject?.({
                    ok: false,
                    status: response.status,
                    error,
                    body: response.type ? JSON.stringify(await response.json()) : undefined,
                });

                throw new Error(
                    JSON.stringify({
                        ok: false,
                        status: response.status,
                        error,
                        body: response.type ? JSON.stringify(await response.json()) : undefined,
                    }),
                );
            } else {
                if (options.retryCount && options.retryCount++ >= rest.maxRetryCount) {
                    rest.debug(`[REST - RetriesMaxed] ${JSON.stringify(options)}`);
                    // REMOVE ITEM FROM QUEUE TO PREVENT RETRY
                    options.reject?.({
                        ok: false,
                        status: response.status,
                        error: "The options was rate limited and it maxed out the retries limit.",
                    });

                    // @ts-ignore Code should never reach here
                    return;
                }
            }
        }

        // SOMETIMES DISCORD RETURNS AN EMPTY 204 RESPONSE THAT CAN'T BE MADE TO JSON
        if (response.status === 204) {
            rest.debug(`[REST - FetchSuccess] URL: ${options.url} | ${JSON.stringify(options)}`);
            options.respond?.({
                ok: true,
                status: 204,
            });
            // @ts-ignore 204 will be void
            return;
        } else {
            // CONVERT THE RESPONSE TO JSON
            const json = JSON.stringify(await response.json());

            rest.debug(`[REST - fetchSuccess] ${JSON.stringify(options)}`);
            options.respond?.({
                ok: true,
                status: 200,
                body: json,
            });

            return JSON.parse(json);
        }
    } catch (error) {
        // SOMETHING WENT WRONG, LOG AND RESPOND WITH ERROR
        rest.debug(`[REST - fetchFailed] Payload: ${JSON.stringify(options)} | Error: ${error}`);
        options.reject?.({
            ok: false,
            status: 599,
            error: "Internal Proxy Error",
        });

        throw new Error("Something went wrong in sendRequest", {
            cause: error,
        });
    }
}