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LookupServer: Don't cache already-expired DNS answers

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This commit is contained in:
Andreas Kling 2020-01-26 16:24:57 +01:00
parent 174583cda5
commit d1721c761e
1 changed files with 9 additions and 4 deletions
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13
Servers/LookupServer/LookupServer.cpp
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@ -240,13 +240,18 @@ Vector<String> LookupServer::lookup(const String& hostname, bool& did_timeout, u
return {};
}
Vector<String> responses;
Vector<String, 8> responses;
Vector<DNSAnswer, 8> cacheable_answers;
for (auto& answer : response.answers()) {
responses.append(answer.record_data());
if (!answer.has_expired())
cacheable_answers.append(answer);
}
if (m_lookup_cache.size() >= 256)
m_lookup_cache.remove(m_lookup_cache.begin());
m_lookup_cache.set(hostname, { request.questions()[0], response.answers() });
if (!cacheable_answers.is_empty()) {
if (m_lookup_cache.size() >= 256)
m_lookup_cache.remove(m_lookup_cache.begin());
m_lookup_cache.set(hostname, { request.questions()[0], move(cacheable_answers) });
}
return responses;
}