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/**
* 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/pipeline/document_source_telemetry.h"
#include "mongo/bson/timestamp.h"
#include "mongo/util/assert_util.h"
namespace mongo {
REGISTER_DOCUMENT_SOURCE(telemetry,
DocumentSourceTelemetry::LiteParsed::parse,
DocumentSourceTelemetry::createFromBson,
AllowedWithApiStrict::kNeverInVersion1);
std::unique_ptr<DocumentSourceTelemetry::LiteParsed> DocumentSourceTelemetry::LiteParsed::parse(
const NamespaceString& nss, const BSONElement& spec) {
uassert(ErrorCodes::FailedToParse,
str::stream() << kStageName
<< " value must be an object. Found: " << typeName(spec.type()),
spec.type() == BSONType::Object);
uassert(ErrorCodes::FailedToParse,
str::stream() << kStageName
<< " parameters object must be empty. Found: " << typeName(spec.type()),
spec.embeddedObject().isEmpty());
return std::make_unique<DocumentSourceTelemetry::LiteParsed>(spec.fieldName());
}
boost::intrusive_ptr<DocumentSource> DocumentSourceTelemetry::createFromBson(
BSONElement spec, const boost::intrusive_ptr<ExpressionContext>& pExpCtx) {
uassert(ErrorCodes::FailedToParse,
str::stream() << kStageName
<< " value must be an object. Found: " << typeName(spec.type()),
spec.type() == BSONType::Object);
uassert(ErrorCodes::FailedToParse,
str::stream() << kStageName
<< " parameters object must be empty. Found: " << typeName(spec.type()),
spec.embeddedObject().isEmpty());
const NamespaceString& nss = pExpCtx->ns;
uassert(ErrorCodes::InvalidNamespace,
"$telemetry must be run against the 'admin' database with {aggregate: 1}",
nss.db() == NamespaceString::kAdminDb && nss.isCollectionlessAggregateNS());
return new DocumentSourceTelemetry(pExpCtx);
}
Value DocumentSourceTelemetry::serialize(boost::optional<ExplainOptions::Verbosity> explain) const {
return Value{Document{{kStageName, Document{}}}};
}
void DocumentSourceTelemetry::buildTelemetryStoreIterator() {
TelemetryStore* telemetryStore = [&]() {
return getTelemetryStoreForRead(getContext()->opCtx->getServiceContext()).first;
}();
// Here we start a new thread which runs until the document source finishes iterating the
// telemetry store.
stdx::thread producer([&, telemetryStore] {
telemetryStore->forEachPartition(
[&](const std::function<TelemetryStore::Partition()>& getPartition) {
// Block here waiting for the queue to be empty. Locking the partition will block
// telemetry writers. We want to delay lock acquisition as long as possible.
_queue.waitForEmpty();
// Now get the locked partition.
auto partition = getPartition();
// Capture the time at which reading the partition begins to indicate to the caller
// when the snapshot began.
const auto partitionReadTime =
Timestamp{Timestamp(Date_t::now().toMillisSinceEpoch() / 1000, 0)};
for (auto&& [key, metrics] : *partition) {
Document d{{{"key", metrics.redactKey(key)},
{"metrics", metrics.toBSON()},
{"asOf", partitionReadTime}}};
_queue.push(std::move(d));
}
});
_queue.closeProducerEnd();
});
producer.detach();
}
DocumentSource::GetNextResult DocumentSourceTelemetry::doGetNext() {
if (!_initialized) {
buildTelemetryStoreIterator();
_initialized = true;
}
auto maybeResult = _queue.pop();
if (maybeResult) {
return {std::move(*maybeResult)};
} else {
return DocumentSource::GetNextResult::makeEOF();
}
}
} // namespace mongo
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