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| 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 | 1x 1x 1x 1x | import { HttpError } from '@api/errors/http';
import {
MAX_RETRY_LIMIT_MS,
POSSIBLE_RETRY_STATUS_HEADERS,
} from '@shared/types/constants';
import retry from 'async-retry';
async function fetchWithTimeout(
url: string,
options: RequestInit,
timeout: number,
requestHandler?: () => Promise<Response>,
): Promise<Response> {
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), timeout);
const timeoutRequestOptions = {
...options,
signal: controller.signal,
};
let response: Response;
try {
if (requestHandler) {
response = await requestHandler();
} else {
response = await fetch(url, timeoutRequestOptions);
}
clearTimeout(timeoutId);
} catch (err) {
if (err instanceof Error && err.name === 'AbortError') {
response = new Response(
JSON.stringify({
error: {
message: `Request exceeded the timeout sent in the request: ${timeout}ms`,
type: 'timeout_error',
param: null,
code: null,
},
}),
{
headers: {
'content-type': 'application/json',
},
status: 408,
},
);
} else {
throw err;
}
}
return response;
}
/**
* Tries making a fetch request a specified number of times until it succeeds.
* If the response's status code is included in the statusCodesToRetry array,
* the request is retried.
*/
export const retryRequest = async (
url: string,
options: RequestInit,
retryCount: number,
statusCodesToRetry: number[],
timeout: number | null,
requestHandler?: () => Promise<Response>,
followProviderRetry?: boolean,
): Promise<{
response: Response;
attempt: number | undefined;
createdAt: Date;
skip: boolean;
}> => {
let lastAttempt: number | undefined;
const start = new Date();
let retrySkipped = false;
let remainingRetryTimeout = MAX_RETRY_LIMIT_MS;
try {
const result = await retry(
async (bail: (error: Error) => void, attempt: number) => {
try {
let response: Response;
if (timeout) {
response = await fetchWithTimeout(
url,
options,
timeout,
requestHandler,
);
} else if (requestHandler) {
response = await requestHandler();
} else {
response = await fetch(url, options);
}
if (statusCodesToRetry.includes(response.status)) {
const responseText = await response.text();
const errorObj = new HttpError(responseText, {
status: response.status,
statusText: response.statusText,
body: responseText,
});
if (response.status === 429 && followProviderRetry) {
// get retry header.
const retryHeader = POSSIBLE_RETRY_STATUS_HEADERS.find(
(header) => {
return response.headers.get(header);
},
);
const retryAfterValue = response.headers.get(retryHeader ?? '');
// continue, if no retry header is found.
if (!retryAfterValue) {
throw errorObj;
}
let retryAfter: number | undefined;
// if the header is `retry-after` convert it to milliseconds.
if (retryHeader === 'retry-after') {
retryAfter = Number.parseInt(retryAfterValue.trim(), 10) * 1000;
} else {
retryAfter = Number.parseInt(retryAfterValue.trim(), 10);
}
if (retryAfter && !Number.isNaN(retryAfter)) {
// break the loop if the retryAfter is greater than the max retry limit
if (
retryAfter >= MAX_RETRY_LIMIT_MS ||
retryAfter > remainingRetryTimeout
) {
retrySkipped = true;
throw errorObj;
}
remainingRetryTimeout -= retryAfter;
// will reset the current backoff timeout(s) to `0`.
throw await new Promise((resolve) => {
setTimeout(() => {
resolve(errorObj);
}, retryAfter);
});
} else {
throw errorObj;
}
}
throw errorObj;
} else if (response.status >= 200 && response.status <= 204) {
// do nothing
} else {
// All error codes that aren't retried need to be propagated up
const responseText = await response.text();
const errorObj = new HttpError(responseText, {
status: response.status,
statusText: response.statusText,
body: responseText,
});
bail(errorObj);
return;
}
return {
response,
attempt: lastAttempt,
createdAt: start,
skip: retrySkipped,
};
} catch (error) {
if (attempt >= retryCount + 1) {
bail(error as Error);
return;
}
throw error;
}
},
{
retries: retryCount,
onRetry: (error: Error, attempt: number): void => {
lastAttempt = attempt;
console.warn(`Failed in Retry attempt ${attempt}. Error: ${error}`);
},
randomize: false,
},
);
if (!result) {
throw new Error('No result');
}
return result;
} catch (error) {
let errorResponse: Response;
if (
error instanceof TypeError &&
error.cause instanceof Error &&
error.cause?.name === 'ConnectTimeoutError'
) {
// This error comes in case the host address is unreachable. Empty status code used to get returned
// from here hence no retry logic used to get called.
errorResponse = new Response(error.message, {
status: 503,
});
} else if (error instanceof HttpError) {
errorResponse = new Response(error.response.body, {
status: error.response.status,
statusText: error.response.statusText,
});
} else if (error instanceof Error) {
// The retry handler will always attach status code to the error object
errorResponse = new Response(
`Message: ${error.message} Cause: ${error.cause ?? 'NA'} Name: ${error.name}`,
{
status: 500,
},
);
} else {
errorResponse = new Response('Something went wrong', {
status: 500,
});
}
return {
response: errorResponse,
attempt: lastAttempt,
createdAt: start,
skip: retrySkipped,
};
}
};
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