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dns cache: log event with addresses on resolution #18036

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Merged
mattklein123 merged 3 commits into from
Sep 10, 2021
Merged

dns cache: log event with addresses on resolution #18036

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e76d4b2
dns cache: log event with addresses on resolution
Sep 9, 2021
f40885a
update
Sep 9, 2021
7a51722
missing title
Sep 9, 2021
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3 changes: 2 additions & 1 deletion source/common/common/stl_helpers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,8 @@ std::string accumulateToString(const ContainerT& source,
if (source.empty()) {
return "[]";
}
return std::accumulate(std::next(source.begin()), source.end(), "[" + string_func(source[0]),
return std::accumulate(std::next(source.begin()), source.end(),
"[" + string_func(*source.begin()),
[string_func](std::string acc, const T& element) {
return acc + ", " + string_func(element);
}) +
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7 changes: 6 additions & 1 deletion source/extensions/common/dynamic_forward_proxy/dns_cache_impl.cc
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Expand Up @@ -2,6 +2,7 @@

#include "envoy/extensions/common/dynamic_forward_proxy/v3/dns_cache.pb.h"

#include "source/common/common/stl_helpers.h"
#include "source/common/config/utility.h"
#include "source/common/http/utility.h"
#include "source/common/network/resolver_impl.h"
Expand Down Expand Up @@ -289,7 +290,11 @@ void DnsCacheImpl::finishResolve(const std::string& host,
Network::DnsResolver::ResolutionStatus status,
std::list<Network::DnsResponse>&& response, bool from_cache) {
ASSERT(main_thread_dispatcher_.isThreadSafe());
ENVOY_LOG(debug, "main thread resolve complete for host '{}'. {} results", host, response.size());
ENVOY_LOG_EVENT(debug, "dns_cache_finish_resolve",
"main thread resolve complete for host '{}': {}", host,
accumulateToString<Network::DnsResponse>(response, [](const auto& dns_response) {
return dns_response.address_->asString();
}));

// Functions like this one that modify primary_hosts_ are only called in the main thread so we
// know it is safe to use the PrimaryHostInfo pointers outside of the lock.
Expand Down