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add __all support for prometheus metics #142

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Dec 1, 2021
Merged

add __all support for prometheus metics #142

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44 changes: 27 additions & 17 deletions src/CoreServer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -339,27 +339,37 @@ void CoreServer::_setup_routes(const PrometheusConfig &prom_config)
}
});
_svr.Get(fmt::format("/api/v1/policies/({})/metrics/prometheus", AbstractModule::MODULE_ID_REGEX).c_str(), [&](const httplib::Request &req, httplib::Response &res) {
auto name = req.matches[1];
if (!_registry.policy_manager()->module_exists(name)) {
res.status = 404;
res.set_content("policy does not exists", "text/plain");
return;
std::vector<std::string> plist;
{
auto name = req.matches[1];
if (name == "__all") {
// special route to get all policy metrics in one call, for scraping performance reasons
plist = _registry.policy_manager()->module_get_keys();
} else if (!_registry.policy_manager()->module_exists(name)) {
res.status = 404;
res.set_content("policy does not exists", "text/plain");
return;
} else {
plist.emplace_back(name);
}
}
try {
std::stringstream output;
auto [policy, lock] = _registry.policy_manager()->module_get_locked(name);
for (auto &mod : policy->modules()) {
auto hmod = dynamic_cast<StreamHandler *>(mod);
if (hmod) {
spdlog::stopwatch sw;
hmod->window_prometheus(output, {{"policy", name}, {"module", hmod->name()}});
_logger->debug("{} window_prometheus elapsed time: {}", hmod->name(), sw);
std::stringstream output;
for (const auto &p_mname : plist) {
try {
auto [policy, lock] = _registry.policy_manager()->module_get_locked(p_mname);
for (auto &mod : policy->modules()) {
auto hmod = dynamic_cast<StreamHandler *>(mod);
if (hmod) {
spdlog::stopwatch sw;
hmod->window_prometheus(output, {{"policy", p_mname}, {"module", hmod->name()}});
_logger->debug("{} window_prometheus elapsed time: {}", hmod->name(), sw);
}
}
} catch (const std::exception &e) {
res.status = 500;
res.set_content(e.what(), "text/plain");
}
res.set_content(output.str(), "text/plain");
} catch (const std::exception &e) {
res.status = 500;
res.set_content(e.what(), "text/plain");
}
});
}
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