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import { LoadPolicy, LoaderConfig, RetryConfig } from '../config';
import { ErrorDetails } from '../errors';
import { ErrorData } from '../types/events';
export function isTimeoutError(error: ErrorData): boolean {
switch (error.details) {
case ErrorDetails.FRAG_LOAD_TIMEOUT:
case ErrorDetails.KEY_LOAD_TIMEOUT:
case ErrorDetails.LEVEL_LOAD_TIMEOUT:
case ErrorDetails.MANIFEST_LOAD_TIMEOUT:
return true;
}
return false;
}
export function getRetryConfig(
loadPolicy: LoadPolicy,
error: ErrorData
): RetryConfig | null {
const isTimeout = isTimeoutError(error);
return loadPolicy.default[`${isTimeout ? 'timeout' : 'error'}Retry`];
}
export function getRetryDelay(
retryConfig: RetryConfig,
retryCount: number
): number {
// exponential backoff capped to max retry delay
const backoffFactor =
retryConfig.backoff === 'linear' ? 1 : Math.pow(2, retryCount);
return Math.min(
backoffFactor * retryConfig.retryDelayMs,
retryConfig.maxRetryDelayMs
);
}
export function getLoaderConfigWithoutReties(
loderConfig: LoaderConfig
): LoaderConfig {
return {
...loderConfig,
...{
errorRetry: null,
timeoutRetry: null,
},
};
}
export function shouldRetry(
retryConfig: RetryConfig | null | undefined,
retryCount: number,
isTimeout: boolean,
httpStatus?: number | undefined
): retryConfig is RetryConfig & boolean {
return (
!!retryConfig &&
retryCount < retryConfig.maxNumRetry &&
(retryForHttpStatus(httpStatus) || !!isTimeout)
);
}
export function retryForHttpStatus(httpStatus: number | undefined) {
// Do not retry on status 4xx, status 0 (CORS error), or undefined (decrypt/gap/parse error)
return (
(httpStatus === 0 && navigator.onLine === false) ||
(!!httpStatus && (httpStatus < 400 || httpStatus > 499))
);
}