From d19dcfc1ccf76518898c5c6d0ebb3e78e37af45c Mon Sep 17 00:00:00 2001
From: Henrik Edin <henrik.edin@mongodb.com>
Date: Thu, 27 Sep 2018 15:04:21 -0400
Subject: SERVER-37294 Remove dependency on clientdriver_network and
 transport_layer for embedded.

---
 src/mongo/db/service_entry_point_mongod.cpp | 52 +++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

(limited to 'src/mongo/db/service_entry_point_mongod.cpp')

diff --git a/src/mongo/db/service_entry_point_mongod.cpp b/src/mongo/db/service_entry_point_mongod.cpp
index c0281fe7460..52656b7ddcc 100644
--- a/src/mongo/db/service_entry_point_mongod.cpp
+++ b/src/mongo/db/service_entry_point_mongod.cpp
@@ -45,12 +45,17 @@
 #include "mongo/db/service_entry_point_common.h"
 #include "mongo/logger/redaction.h"
 #include "mongo/rpc/get_status_from_command_result.h"
+#include "mongo/rpc/metadata/config_server_metadata.h"
+#include "mongo/rpc/metadata/sharding_metadata.h"
 #include "mongo/s/cannot_implicitly_create_collection_info.h"
+#include "mongo/s/grid.h"
 #include "mongo/s/stale_exception.h"
 #include "mongo/util/log.h"
 
 namespace mongo {
 
+constexpr auto kLastCommittedOpTimeFieldName = "lastCommittedOpTime"_sd;
+
 class ServiceEntryPointMongod::Hooks final : public ServiceEntryPointCommon::Hooks {
 public:
     bool lockedForWriting() const override {
@@ -149,6 +154,53 @@ public:
         }
     }
 
+    // Called from the error contexts where request may not be available.
+    void appendReplyMetadataOnError(OperationContext* opCtx,
+                                    BSONObjBuilder* metadataBob) const override {
+        const bool isConfig = serverGlobalParams.clusterRole == ClusterRole::ConfigServer;
+        if (ShardingState::get(opCtx)->enabled() || isConfig) {
+            auto lastCommittedOpTime =
+                repl::ReplicationCoordinator::get(opCtx)->getLastCommittedOpTime();
+            metadataBob->append(kLastCommittedOpTimeFieldName, lastCommittedOpTime.getTimestamp());
+        }
+    }
+
+    void appendReplyMetadata(OperationContext* opCtx,
+                             const OpMsgRequest& request,
+                             BSONObjBuilder* metadataBob) const override {
+        const bool isShardingAware = ShardingState::get(opCtx)->enabled();
+        const bool isConfig = serverGlobalParams.clusterRole == ClusterRole::ConfigServer;
+        auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
+        const bool isReplSet =
+            replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
+
+        if (isReplSet) {
+            // Attach our own last opTime.
+            repl::OpTime lastOpTimeFromClient =
+                repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
+            replCoord->prepareReplMetadata(request.body, lastOpTimeFromClient, metadataBob);
+            // For commands from mongos, append some info to help getLastError(w) work.
+            // TODO: refactor out of here as part of SERVER-18236
+            if (isShardingAware || isConfig) {
+                rpc::ShardingMetadata(lastOpTimeFromClient, replCoord->getElectionId())
+                    .writeToMetadata(metadataBob)
+                    .transitional_ignore();
+            }
+
+            if (isShardingAware || isConfig) {
+                auto lastCommittedOpTime = replCoord->getLastCommittedOpTime();
+                metadataBob->append(kLastCommittedOpTimeFieldName,
+                                    lastCommittedOpTime.getTimestamp());
+            }
+        }
+
+        // If we're a shard other than the config shard, attach the last configOpTime we know about.
+        if (isShardingAware && !isConfig) {
+            auto opTime = Grid::get(opCtx)->configOpTime();
+            rpc::ConfigServerMetadata(opTime).writeToMetadata(metadataBob);
+        }
+    }
+
     void advanceConfigOptimeFromRequestMetadata(OperationContext* opCtx) const override {
         // Handle config optime information that may have been sent along with the command.
         rpc::advanceConfigOptimeFromRequestMetadata(opCtx);
-- 
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