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Copy pathhttp.ts
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221 lines (190 loc) · 5.93 KB
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/**
* 공용 HTTP 유틸리티
*/
export interface FetchOptions extends RequestInit {
timeout?: number;
retries?: number;
retryDelayMs?: number;
retryStatusCodes?: number[];
retryUnsafeMethods?: boolean;
retryMethods?: string[];
onRetry?: (event: FetchRetryEvent) => void;
}
export interface FetchRetryEvent {
attempt: number;
maxAttempts: number;
delayMs: number;
reason: 'status' | 'error';
status?: number;
error?: unknown;
method: string;
url: string;
}
export class HttpError extends Error {
readonly status: number;
readonly statusText: string;
readonly bodyText: string;
constructor(status: number, statusText: string, bodyText: string) {
const normalizedBody = bodyText.trim().replace(/\s+/g, ' ').slice(0, 300);
const detail = normalizedBody.length > 0 ? ` - ${normalizedBody}` : '';
super(`API 요청 실패: ${status} ${statusText}${detail}`);
this.name = 'HttpError';
this.status = status;
this.statusText = statusText;
this.bodyText = bodyText;
}
}
/** HTML 원문을 노출하지 않고 예상하지 못한 응답 형식을 구분합니다. */
export class UnexpectedHtmlResponseError extends Error {
constructor(
readonly status: number,
readonly contentType: string,
) {
super(`JSON 대신 HTML 응답을 받았습니다 (HTTP ${status}).`);
this.name = 'UnexpectedHtmlResponseError';
}
}
export function createTimeoutController(timeout: number): {
controller: AbortController;
timeoutId: ReturnType<typeof setTimeout>;
} {
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), timeout);
return { controller, timeoutId };
}
const DEFAULT_RETRY_STATUS_CODES = [408, 429, 500, 502, 503, 504, 522, 524];
const DEFAULT_RETRY_METHODS = ['GET', 'HEAD', 'OPTIONS'];
function isRetryableStatus(status: number, retryStatusCodes: number[]): boolean {
return retryStatusCodes.includes(status);
}
function wait(ms: number): Promise<void> {
if (ms <= 0) {
return Promise.resolve();
}
return new Promise((resolve) => {
setTimeout(resolve, ms);
});
}
function normalizeMethod(method: string | undefined): string {
return (method || 'GET').toUpperCase();
}
function canRetryMethod(
method: string,
retryMethods: string[],
retryUnsafeMethods: boolean,
): boolean {
return retryUnsafeMethods || retryMethods.map((item) => item.toUpperCase()).includes(method);
}
function parseRetryAfterDelayMs(response: Response): number | null {
const retryAfter = response.headers.get('retry-after');
if (!retryAfter) {
return null;
}
const seconds = Number.parseFloat(retryAfter);
if (Number.isFinite(seconds)) {
return Math.max(0, Math.trunc(seconds * 1000));
}
const retryDate = Date.parse(retryAfter);
if (Number.isFinite(retryDate)) {
return Math.max(0, retryDate - Date.now());
}
return null;
}
async function requestWithTimeout<T>(
url: string,
options: FetchOptions,
readResponse: (response: Response) => Promise<T>,
): Promise<T> {
const {
timeout = 10000,
retries = 0,
retryDelayMs = 250,
retryStatusCodes = DEFAULT_RETRY_STATUS_CODES,
retryUnsafeMethods = false,
retryMethods = DEFAULT_RETRY_METHODS,
onRetry,
...restOptions
} = options;
const maxAttempts = Math.max(1, Math.trunc(retries) + 1);
const method = normalizeMethod(restOptions.method);
const retryAllowed = canRetryMethod(method, retryMethods, retryUnsafeMethods);
for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
const { controller, timeoutId } = createTimeoutController(timeout);
let readingResponse = false;
try {
const response = await fetch(url, {
...restOptions,
signal: controller.signal,
});
if (
retryAllowed &&
attempt < maxAttempts &&
isRetryableStatus(response.status, retryStatusCodes)
) {
const delayMs = parseRetryAfterDelayMs(response) ?? retryDelayMs;
onRetry?.({
attempt,
maxAttempts,
delayMs,
reason: 'status',
status: response.status,
method,
url,
});
await response.body?.cancel();
await wait(delayMs);
continue;
}
readingResponse = true;
return await readResponse(response);
} catch (error) {
if (readingResponse || !retryAllowed || attempt >= maxAttempts) {
throw error;
}
onRetry?.({
attempt,
maxAttempts,
delayMs: retryDelayMs,
reason: 'error',
error,
method,
url,
});
await wait(retryDelayMs);
} finally {
clearTimeout(timeoutId);
}
}
/* v8 ignore next */
throw new Error('API 요청 재시도 처리 중 알 수 없는 오류가 발생했습니다.');
}
export async function fetchWithTimeout(url: string, options: FetchOptions = {}): Promise<Response> {
return requestWithTimeout(url, options, async (response) => response);
}
async function readTextResponse(url: string, options: FetchOptions) {
// 헤더 수신뿐 아니라 본문 읽기에도 같은 요청 제한 시간을 적용합니다.
return requestWithTimeout(url, options, async (response) => ({
response,
body: await response.text(),
}));
}
export async function fetchJson<T>(url: string, options: FetchOptions = {}): Promise<T> {
const { response, body } = await readTextResponse(url, options);
if (!response.ok) {
throw new HttpError(response.status, response.statusText, body);
}
if (/^\s*(?:<!doctype\s+html\b|<html\b)/i.test(body)) {
throw new UnexpectedHtmlResponseError(
response.status,
response.headers.get('content-type') || '',
);
}
return JSON.parse(body) as T;
}
export async function fetchText(url: string, options: FetchOptions = {}): Promise<string> {
const { response, body } = await readTextResponse(url, options);
if (!response.ok) {
throw new HttpError(response.status, response.statusText, body);
}
return body;
}