SERVER-67505 Move multi-doc transaction classes from mongo/db/ to mongo/db/transaction sub directory

1 files changed, 159 insertions, 0 deletions

diff --git a/src/mongo/db/transaction/transaction_history_iterator.cpp b/src/mongo/db/transaction/transaction_history_iterator.cpp
new file mode 100644
index 00000000000..d9be44df320
--- /dev/null
+++ b/src/mongo/db/transaction/transaction_history_iterator.cpp
@@ -0,0 +1,159 @@
+/**
+ *    Copyright (C) 2018-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/platform/basic.h"
+
+#include "mongo/db/catalog/database_holder.h"
+#include "mongo/db/db_raii.h"
+#include "mongo/db/exec/working_set_common.h"
+#include "mongo/db/namespace_string.h"
+#include "mongo/db/operation_context.h"
+#include "mongo/db/query/get_executor.h"
+#include "mongo/db/repl/oplog_entry.h"
+#include "mongo/db/transaction/transaction_history_iterator.h"
+#include "mongo/logv2/redaction.h"
+#include "mongo/util/str.h"
+
+namespace mongo {
+
+namespace {
+
+/**
+ * Query the oplog for an entry with the given timestamp.
+ */
+BSONObj findOneOplogEntry(OperationContext* opCtx,
+                          const repl::OpTime& opTime,
+                          bool permitYield,
+                          bool prevOpOnly = false) {
+    BSONObj oplogBSON;
+    invariant(!opTime.isNull());
+
+    auto findCommand = std::make_unique<FindCommandRequest>(NamespaceString::kRsOplogNamespace);
+    findCommand->setFilter(opTime.asQuery());
+
+    if (prevOpOnly) {
+        findCommand->setProjection(
+            BSON("_id" << 0 << repl::OplogEntry::kPrevWriteOpTimeInTransactionFieldName << 1LL));
+    }
+
+    const boost::intrusive_ptr<ExpressionContext> expCtx;
+
+    auto statusWithCQ = CanonicalQuery::canonicalize(opCtx,
+                                                     std::move(findCommand),
+                                                     false,
+                                                     expCtx,
+                                                     ExtensionsCallbackNoop(),
+                                                     MatchExpressionParser::kBanAllSpecialFeatures);
+    invariant(statusWithCQ.isOK(),
+              str::stream() << "Failed to canonicalize oplog lookup"
+                            << causedBy(statusWithCQ.getStatus()));
+    std::unique_ptr<CanonicalQuery> cq = std::move(statusWithCQ.getValue());
+
+    AutoGetOplog oplogRead(opCtx, OplogAccessMode::kRead);
+    const DatabaseName dbName(boost::none, NamespaceString::kLocalDb);
+    const auto localDb = DatabaseHolder::get(opCtx)->getDb(opCtx, dbName);
+    invariant(localDb);
+    AutoStatsTracker statsTracker(opCtx,
+                                  NamespaceString::kRsOplogNamespace,
+                                  Top::LockType::ReadLocked,
+                                  AutoStatsTracker::LogMode::kUpdateTop,
+                                  CollectionCatalog::get(opCtx)->getDatabaseProfileLevel(dbName),
+                                  Date_t::max());
+
+    auto exec = uassertStatusOK(getExecutorFind(opCtx,
+                                                &oplogRead.getCollection(),
+                                                std::move(cq),
+                                                nullptr /*extractAndAttachPipelineStages */,
+                                                permitYield));
+
+    PlanExecutor::ExecState getNextResult;
+    try {
+        getNextResult = exec->getNext(&oplogBSON, nullptr);
+    } catch (DBException& exception) {
+        exception.addContext("PlanExecutor error in TransactionHistoryIterator");
+        throw;
+    }
+
+    uassert(ErrorCodes::IncompleteTransactionHistory,
+            str::stream() << "oplog no longer contains the complete write history of this "
+                             "transaction, log with opTime "
+                          << opTime.toBSON() << " cannot be found",
+            getNextResult != PlanExecutor::IS_EOF);
+
+    return oplogBSON.getOwned();
+}
+
+}  // namespace
+
+TransactionHistoryIterator::TransactionHistoryIterator(repl::OpTime startingOpTime,
+                                                       bool permitYield)
+    : _permitYield(permitYield), _nextOpTime(std::move(startingOpTime)) {}
+
+bool TransactionHistoryIterator::hasNext() const {
+    return !_nextOpTime.isNull();
+}
+
+repl::OplogEntry TransactionHistoryIterator::next(OperationContext* opCtx) {
+    BSONObj oplogBSON = findOneOplogEntry(opCtx, _nextOpTime, _permitYield);
+
+    auto oplogEntry = uassertStatusOK(repl::OplogEntry::parse(oplogBSON));
+    const auto& oplogPrevTsOption = oplogEntry.getPrevWriteOpTimeInTransaction();
+    uassert(ErrorCodes::FailedToParse,
+            str::stream()
+                << "Missing prevOpTime field on oplog entry of previous write in transaction: "
+                << redact(oplogBSON),
+            oplogPrevTsOption);
+
+    _nextOpTime = oplogPrevTsOption.value();
+
+    return oplogEntry;
+}
+
+repl::OplogEntry TransactionHistoryIterator::nextFatalOnErrors(OperationContext* opCtx) try {
+    return next(opCtx);
+} catch (const DBException& ex) {
+    fassertFailedWithStatus(31145, ex.toStatus());
+}
+
+repl::OpTime TransactionHistoryIterator::nextOpTime(OperationContext* opCtx) {
+    BSONObj oplogBSON = findOneOplogEntry(opCtx, _nextOpTime, _permitYield, true /* prevOpOnly */);
+
+    auto prevOpTime = oplogBSON[repl::OplogEntry::kPrevWriteOpTimeInTransactionFieldName];
+    uassert(ErrorCodes::FailedToParse,
+            str::stream()
+                << "Missing prevOpTime field on oplog entry of previous write in transaction: "
+                << redact(oplogBSON),
+            !prevOpTime.eoo() && prevOpTime.isABSONObj());
+
+    auto returnOpTime = _nextOpTime;
+    _nextOpTime = repl::OpTime::parse(prevOpTime.Obj());
+    return returnOpTime;
+}
+
+}  // namespace mongo