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Faster flake.lock parsing

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This PR reduces the creation of short-lived basic_json objects while
parsing flake.lock files. For large flake.lock files (~1.5MB) I was
observing ~60s being spent for trivial nix build operations while
after this change it is now taking ~1.6s.

(cherry picked from commit 7fd0de38c6)
(cherry picked from commit f94fb636c0)
This commit is contained in:
Graham Dennis 2024-02-21 18:40:34 +11:00 committed by github-actions[bot]
parent f092ae4478
commit 2dd715ef0b
1 changed files with 1 additions and 1 deletions
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src/libexpr/flake/lockfile.cc
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@ -89,7 +89,7 @@ LockFile::LockFile(const nlohmann::json & json, const Path & path)
std::string inputKey = i.value();
auto k = nodeMap.find(inputKey);
if (k == nodeMap.end()) {
auto nodes = json["nodes"];
auto & nodes = json["nodes"];
auto jsonNode2 = nodes.find(inputKey);
if (jsonNode2 == nodes.end())
throw Error("lock file references missing node '%s'", inputKey);