Repository navigation
Expand file tree
/
Copy pathhttp.ts
More file actions
284 lines (253 loc) · 8.32 KB
/
Copy pathhttp.ts
File metadata and controls
284 lines (253 loc) · 8.32 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
import { browseReadSignal } from './browseReadSignal.js';
import { parseRelayQuota, type RelayQuota } from './relayQuota.js';
import { diagnosticEvent } from './diagnostics.js';
/**
* 공용 HTTP 유틸리티
*/
export interface FetchOptions extends RequestInit {
fetchImpl?: typeof fetch;
timeout?: number;
/** 모든 시도와 대기 시간을 합친 제한 시간입니다. */
totalTimeout?: number;
/** fetchJson/fetchText에서 허용할 정확한 HTTP 상태입니다. 생략하면 모든 2xx를 허용합니다. */
expectedStatus?: 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 quota?: RelayQuota;
readonly status: number;
readonly statusText: string;
readonly bodyText: string;
constructor(status: number, statusText: string, bodyText: string, headers?: Headers) {
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;
this.quota = parseRelayQuota(status, headers);
}
}
/** 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, signal?: AbortSignal | null): Promise<void> {
signal?.throwIfAborted();
if (ms <= 0) {
return Promise.resolve();
}
return new Promise((resolve, reject) => {
const onAbort = () => {
clearTimeout(timer);
signal?.removeEventListener('abort', onAbort);
reject(signal?.reason);
};
const timer = setTimeout(() => {
signal?.removeEventListener('abort', onAbort);
resolve();
}, ms);
signal?.addEventListener('abort', onAbort, { once: true });
});
}
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);
}
export 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,
totalTimeout,
signal: optionSignal,
fetchImpl = fetch,
retries = 0,
retryDelayMs = 250,
retryStatusCodes = DEFAULT_RETRY_STATUS_CODES,
retryUnsafeMethods = false,
retryMethods = DEFAULT_RETRY_METHODS,
onRetry,
expectedStatus: _expectedStatus,
...restOptions
} = options;
const callerSignal = browseReadSignal(optionSignal);
const maxAttempts = Math.max(1, Math.trunc(retries) + 1);
const method = normalizeMethod(restOptions.method);
const retryAllowed = canRetryMethod(method, retryMethods, retryUnsafeMethods);
const deadline = totalTimeout === undefined ? Infinity : Date.now() + totalTimeout;
for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
callerSignal?.throwIfAborted();
const remaining = deadline - Date.now();
if (remaining <= 0) throw new DOMException('Request deadline exceeded', 'TimeoutError');
const { controller, timeoutId } = createTimeoutController(Math.min(timeout, remaining));
const signal = callerSignal
? AbortSignal.any([controller.signal, callerSignal])
: controller.signal;
let readingResponse = false;
const started = Date.now();
let responseStatus: number | undefined;
try {
const response = await fetchImpl(url, {
...restOptions,
signal,
});
responseStatus = response.status;
diagnosticEvent({
stage: 'http',
outcome: response.ok ? 'ok' : 'error',
status: response.status,
durationMs: Date.now() - started,
});
if (
retryAllowed &&
attempt < maxAttempts &&
isRetryableStatus(response.status, retryStatusCodes)
) {
const delayMs = parseRetryAfterDelayMs(response) ?? retryDelayMs;
if (delayMs >= deadline - Date.now()) {
readingResponse = true;
return await readResponse(response);
}
onRetry?.({
attempt,
maxAttempts,
delayMs,
reason: 'status',
status: response.status,
method,
url,
});
await response.body?.cancel();
await wait(delayMs, callerSignal);
continue;
}
readingResponse = true;
return await readResponse(response);
} catch (error) {
diagnosticEvent({
stage: 'http',
outcome: 'error',
status: responseStatus,
durationMs: Date.now() - started,
});
callerSignal?.throwIfAborted();
if (
readingResponse ||
!retryAllowed ||
attempt >= maxAttempts ||
retryDelayMs >= deadline - Date.now()
) {
throw error;
}
onRetry?.({
attempt,
maxAttempts,
delayMs: retryDelayMs,
reason: 'error',
error,
method,
url,
});
await wait(retryDelayMs, callerSignal);
} 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 ||
(options.expectedStatus !== undefined && response.status !== options.expectedStatus)
) {
throw new HttpError(response.status, response.statusText, body, response.headers);
}
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 ||
(options.expectedStatus !== undefined && response.status !== options.expectedStatus)
) {
throw new HttpError(response.status, response.statusText, body, response.headers);
}
return body;
}