From 87160f876c6fb94f5d03062b2caee57539ec5d8e Mon Sep 17 00:00:00 2001
From: "liubov.molchanova" <liubov.molchanova@mongodb.com>
Date: Wed, 17 May 2023 08:16:48 +0000
Subject: Revert "SERVER-76427: Rename $telemetry to $queryStats"

This reverts commit d646e44b7801a3e5b3230bbae7dcfe05a5ed8707.
---
 src/mongo/db/query/telemetry_util.cpp | 97 +++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/mongo/db/query/telemetry_util.cpp

(limited to 'src/mongo/db/query/telemetry_util.cpp')

diff --git a/src/mongo/db/query/telemetry_util.cpp b/src/mongo/db/query/telemetry_util.cpp
new file mode 100644
index 00000000000..eeaf7da71e6
--- /dev/null
+++ b/src/mongo/db/query/telemetry_util.cpp
@@ -0,0 +1,97 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/db/query/telemetry_util.h"
+
+#include "mongo/base/status.h"
+#include "mongo/db/concurrency/d_concurrency.h"
+#include "mongo/db/query/partitioned_cache.h"
+#include "mongo/db/query/query_knobs_gen.h"
+#include "mongo/db/query/util/memory_util.h"
+#include "mongo/db/service_context.h"
+#include "mongo/logv2/log.h"
+
+
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
+
+namespace mongo::telemetry_util {
+
+namespace {
+/**
+ * Given the current 'Client', returns a pointer to the 'ServiceContext' and an interface for
+ * updating the telemetry store.
+ */
+std::pair<ServiceContext*, OnParamChangeUpdater*> getUpdater(const Client& client) {
+    auto serviceCtx = client.getServiceContext();
+    tassert(7106500, "ServiceContext must be non null", serviceCtx);
+
+    auto updater = telemetryStoreOnParamChangeUpdater(serviceCtx).get();
+    tassert(7106501, "Telemetry store size updater must be non null", updater);
+    return {serviceCtx, updater};
+}
+}  // namespace
+
+
+Status onTelemetryStoreSizeUpdate(const std::string& str) {
+    auto newSize = memory_util::MemorySize::parse(str);
+    if (!newSize.isOK()) {
+        return newSize.getStatus();
+    }
+
+    // The client is nullptr if the parameter is supplied from the command line. In this case, we
+    // ignore the update event, the parameter will be processed when initializing the service
+    // context.
+    if (auto client = Client::getCurrent()) {
+        auto&& [serviceCtx, updater] = getUpdater(*client);
+        updater->updateCacheSize(serviceCtx, newSize.getValue());
+    }
+
+    return Status::OK();
+}
+
+Status validateTelemetryStoreSize(const std::string& str, const boost::optional<TenantId>&) {
+    return memory_util::MemorySize::parse(str).getStatus();
+}
+
+Status onTelemetrySamplingRateUpdate(int samplingRate) {
+    // The client is nullptr if the parameter is supplied from the command line. In this case, we
+    // ignore the update event, the parameter will be processed when initializing the service
+    // context.
+    if (auto client = Client::getCurrent()) {
+        auto&& [serviceCtx, updater] = getUpdater(*client);
+        updater->updateSamplingRate(serviceCtx, samplingRate < 0 ? INT_MAX : samplingRate);
+    }
+
+    return Status::OK();
+}
+
+const Decorable<ServiceContext>::Decoration<std::unique_ptr<OnParamChangeUpdater>>
+    telemetryStoreOnParamChangeUpdater =
+        ServiceContext::declareDecoration<std::unique_ptr<OnParamChangeUpdater>>();
+}  // namespace mongo::telemetry_util
-- 
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