Revert "SERVER-19004 Get rid of Shard::runCommand"

This reverts commit ce22d7ea21ad0f529b0dbb4e0b9264d1a68637ff.

3 files changed, 160 insertions, 0 deletions

diff --git a/src/mongo/client/SConscript b/src/mongo/client/SConscript
index 0b2d9cf7805..d71678fe1f1 100644
--- a/src/mongo/client/SConscript
+++ b/src/mongo/client/SConscript
@@ -122,6 +122,16 @@ env.Library(
 )
 
 env.Library(
+    target='remote_command_runner_mock',
+    source=[
+        'remote_command_runner_mock.cpp',
+    ],
+    LIBDEPS=[
+         'remote_command_runner',
+    ]
+)
+
+env.Library(
     target='remote_command_targeter',
     source=[
         'remote_command_targeter_factory_impl.cpp',
diff --git a/src/mongo/client/remote_command_runner_mock.cpp b/src/mongo/client/remote_command_runner_mock.cpp
new file mode 100644
index 00000000000..c9df7c52bca
--- /dev/null
+++ b/src/mongo/client/remote_command_runner_mock.cpp
@@ -0,0 +1,70 @@
+/**
+ *    Copyright (C) 2015 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    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 GNU Affero General 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/client/remote_command_runner_mock.h"
+
+#include "mongo/unittest/unittest.h"
+#include "mongo/util/mongoutils/str.h"
+
+namespace mongo {
+
+namespace {
+void noCheckerSet(const RemoteCommandRequest& request) {
+    FAIL(str::stream() << "runCommand not expected to be called. request: " << request.toString());
+}
+}
+
+RemoteCommandRunnerMock::RemoteCommandRunnerMock()
+    : _runCommandChecker(noCheckerSet),
+      _response(Status(ErrorCodes::InternalError, "response not set")) {}
+
+RemoteCommandRunnerMock::~RemoteCommandRunnerMock() = default;
+
+RemoteCommandRunnerMock* RemoteCommandRunnerMock::get(RemoteCommandRunner* runner) {
+    auto mock = dynamic_cast<RemoteCommandRunnerMock*>(runner);
+    invariant(mock);
+
+    return mock;
+}
+
+StatusWith<RemoteCommandResponse> RemoteCommandRunnerMock::runCommand(
+    const RemoteCommandRequest& request) {
+    _runCommandChecker(request);
+    _runCommandChecker = noCheckerSet;
+    return _response;
+}
+
+void RemoteCommandRunnerMock::setNextExpectedCommand(
+    stdx::function<void(const RemoteCommandRequest& request)> checkerFunc,
+    StatusWith<RemoteCommandResponse> returnThis) {
+    _runCommandChecker = checkerFunc;
+    _response = std::move(returnThis);
+}
+}
diff --git a/src/mongo/client/remote_command_runner_mock.h b/src/mongo/client/remote_command_runner_mock.h
new file mode 100644
index 00000000000..fb3b6bc26dd
--- /dev/null
+++ b/src/mongo/client/remote_command_runner_mock.h
@@ -0,0 +1,80 @@
+/**
+ *    Copyright (C) 2015 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    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 GNU Affero General 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.
+ */
+
+#pragma once
+
+#include "mongo/client/remote_command_runner.h"
+#include "mongo/stdx/functional.h"
+
+namespace mongo {
+
+/**
+ * Note: This is NOT thread-safe.
+ *
+ * Example usage:
+ *
+ * RemoteCommandRunnerMock executor;
+ * executor.setNextExpectedCommand([](const RemoteCommandRequest& request) {
+ *     ASSERT_EQUALS("config", request.dbname);
+ * },
+ * RemoteCommandResponse(BSON("ok" << 1), Milliseconds(0)));
+ *
+ * auto response = executor.runCommand(RemoteCommandRequest()); // Assertion error!
+ */
+class RemoteCommandRunnerMock final : public RemoteCommandRunner {
+public:
+    RemoteCommandRunnerMock();
+    virtual ~RemoteCommandRunnerMock();
+
+    /**
+     * Shortcut for unit-tests.
+     */
+    static RemoteCommandRunnerMock* get(RemoteCommandRunner* runner);
+
+    /**
+     * Runs the function set by the last call to setNextExpectedCommand. Calling this more
+     * than once after a single call to setNextExpectedCommand will result in an assertion
+     * failure.
+     *
+     * Returns the value set on a previous call to setNextExpectedCommand.
+     */
+    StatusWith<RemoteCommandResponse> runCommand(const RemoteCommandRequest& request) override;
+
+    /**
+     * Sets the checker method to use and it's return value the next time runCommand is
+     * called.
+     */
+    void setNextExpectedCommand(
+        stdx::function<void(const RemoteCommandRequest& request)> checkerFunc,
+        StatusWith<RemoteCommandResponse> returnThis);
+
+private:
+    stdx::function<void(const RemoteCommandRequest& request)> _runCommandChecker;
+    StatusWith<RemoteCommandResponse> _response;
+};
+}