From 6be5ff60cf3233dff7fff542ded1a06b541076b1 Mon Sep 17 00:00:00 2001
From: Greg Studer <greg@10gen.com>
Date: Tue, 14 Jan 2014 16:35:28 -0500
Subject: SERVER-12274 mongos GLE changes for better backwards compatibility

---
 src/mongo/s/write_ops/batch_downconvert.h | 32 ++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

(limited to 'src/mongo/s/write_ops/batch_downconvert.h')

diff --git a/src/mongo/s/write_ops/batch_downconvert.h b/src/mongo/s/write_ops/batch_downconvert.h
index 1c81858c55c..cd5440ae993 100644
--- a/src/mongo/s/write_ops/batch_downconvert.h
+++ b/src/mongo/s/write_ops/batch_downconvert.h
@@ -35,6 +35,8 @@
 #include "mongo/bson/bsonobj.h"
 #include "mongo/bson/optime.h"
 #include "mongo/client/dbclientinterface.h"
+#include "mongo/s/multi_command_dispatch.h"
+#include "mongo/s/write_ops/batch_write_exec.h"
 #include "mongo/s/write_ops/batch_write_op.h"
 #include "mongo/s/write_ops/batched_command_request.h"
 #include "mongo/s/write_ops/batched_command_response.h"
@@ -67,7 +69,7 @@ namespace mongo {
          * write command emulation.
          */
         virtual Status enforceWriteConcern( DBClientBase* conn,
-                                            const std::string& dbName,
+                                            const StringData& dbName,
                                             const BSONObj& writeConcern,
                                             BSONObj* gleResponse ) = 0;
     };
@@ -91,10 +93,6 @@ namespace mongo {
                              const BatchedCommandRequest& request,
                              BatchedCommandResponse* response );
 
-        //
-        // Exposed for testing
-        //
-
         // Helper that acts as an auto-ptr for write and wc errors
         struct GLEErrors {
             auto_ptr<WriteErrorDetail> writeError;
@@ -124,9 +122,33 @@ namespace mongo {
          */
         static void extractGLEStats( const BSONObj& gleResponse, GLEStats* stats );
 
+        /**
+         * Given a GLE response, strips out all non-write-concern related information
+         */
+        static BSONObj stripNonWCInfo( const BSONObj& gleResponse );
+
     private:
 
         SafeWriter* _safeWriter;
     };
 
+    // Used for reporting legacy write concern responses
+    struct LegacyWCResponse {
+        string shardHost;
+        BSONObj gleResponse;
+        string errToReport;
+    };
+
+    /**
+     * Uses GLE and the shard hosts and opTimes last written by write commands to enforce a
+     * write concern across the previously used shards.
+     *
+     * Returns OK with the LegacyWCResponses containing only write concern error information
+     * Returns !OK if there was an error getting a GLE response
+     */
+    Status enforceLegacyWriteConcern( MultiCommandDispatch* dispatcher,
+                                      const StringData& dbName,
+                                      const BSONObj& options,
+                                      const HostOpTimeMap& hostOpTimes,
+                                      vector<LegacyWCResponse>* wcResponses );
 }
-- 
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