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#include <mbgl/util/http_timeout.hpp>
#include <mbgl/util/constants.hpp>
#include <cassert>
namespace mbgl {
namespace http {
Duration errorRetryTimeout(Response::Error::Reason failedRequestReason, uint32_t failedRequests, optional<Timestamp> retryAfter) {
if (failedRequestReason == Response::Error::Reason::Server) {
// Retry after one second three times, then start exponential backoff.
return Seconds(failedRequests <= 3 ? 1 : 1u << std::min(failedRequests - 3, 31u));
} else if (failedRequestReason == Response::Error::Reason::Connection) {
// Immediate exponential backoff.
assert(failedRequests > 0);
return Seconds(1u << std::min(failedRequests - 1, 31u));
} else if (failedRequestReason == Response::Error::Reason::RateLimit) {
if (retryAfter) {
return *retryAfter - util::now();
} else {
// Default
return Seconds(util::DEFAULT_RATE_LIMIT_TIMEOUT);
}
} else {
// No error, or not an error that triggers retries.
return Duration::max();
}
}
Duration expirationTimeout(optional<Timestamp> expires, uint32_t expiredRequests) {
if (expiredRequests) {
return Seconds(1u << std::min(expiredRequests - 1, 31u));
} else if (expires) {
return std::max(Seconds::zero(), *expires - util::now());
} else {
return Duration::max();
}
}
} // namespace http
} // namespace mbgl
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