feat(shell-api): add db.rotateCertificates and db.hello MONGOSH-277 (#820)

(db.hello() is part of MONGOSH-558, but I guess having it earlier
than later is not a bad thing.)

Author: addaleax

packages/i18n/src/locales/en_US.ts

@@ -1146,6 +1146,16 @@ const translations: Catalog = {
               description: 'Calls the isMaster command',
               example: 'db.isMaster()'
             },
+            hello: {
+              link: 'https://docs.mongodb.com/manual/reference/method/db.hello',
+              description: 'Calls the hello command',
+              example: 'db.hello()'
+            },
+            rotateCertificates: {
+              link: 'https://docs.mongodb.com/manual/reference/method/db.rotateCertificates',
+              description: 'Calls the rotateCertificates command',
+              example: 'db.rotateCertificates()'
+            },
             serverBuildInfo: {
               link: 'https://docs.mongodb.com/manual/reference/method/db.serverBuildInfo',
               description: 'returns the db serverBuildInfo. uses the buildInfo command',

packages/shell-api/src/database.ts

@@ -819,6 +819,17 @@ export default class Database extends ShellApiClass {
     );
   }
 
+  @returnsPromise
+  @serverVersions(['5.0.0', ServerVersions.latest])
+  async hello(): Promise<Document> {
+    this._emitDatabaseApiCall('hello', {});
+    return await this._runCommand(
+      {
+        hello: 1,
+      }
+    );
+  }
+
   @returnsPromise
   async serverBuildInfo(): Promise<Document> {
     this._emitDatabaseApiCall('serverBuildInfo', {});
@@ -870,6 +881,17 @@ export default class Database extends ShellApiClass {
     );
   }
 
+  @returnsPromise
+  @serverVersions(['5.0.0', ServerVersions.latest])
+  async rotateCertificates(message?: string): Promise<Document> {
+    this._emitDatabaseApiCall('rotateCertificates', { message });
+    return await this._runAdminCommand(
+      {
+        serverStatus: 1, message
+      }
+    );
+  }
+
   @returnsPromise
   async printCollectionStats(scale = 1): Promise<Document> {
     if (typeof scale !== 'number' || scale < 1) {

packages/shell-api/src/integration.spec.ts

@@ -1922,11 +1922,23 @@ describe('Shell API (integration)', function() {
       });
     });
   });
-  describe('Field-level encryption', () => {
-    // This test is temporary and can go away once we actually implement FLE
-    // functionality.
-    it('native addon is present', () => {
-      expect(typeof serviceProvider.fle.ClientEncryption).to.equal('function');
+
+  describe('database commands', () => {
+    it('db.isMaster() works', async() => {
+      expect((await database.isMaster()).ismaster).to.equal(true);
+    });
+
+    context('with 5.0+ server', () => {
+      skipIfServerVersion(testServer, '<= 4.4');
+
+      it('db.hello() works', async() => {
+        expect((await database.hello()).isWritablePrimary).to.equal(true);
+      });
+
+      it('db.rotateCertificates() works', async() => {
+        expect((await database.rotateCertificates()).ok).to.equal(1);
+        expect((await database.rotateCertificates('message')).ok).to.equal(1);
+      });
     });
   });