RatingService: Return promise

This only replaces the callbacks at the highest level and starts to move
toward proper error handling.  The private methods do not yet properly
propagate errors.

src/server/daemon/controller.js

@@ -536,11 +536,9 @@ function doRoute( program, request, data, resolve, reject )
             {
                 var response = UserResponse( request );
 
-                rating_service.request( request, response, quote, alias, function()
-                {
-                    // we're done; free the lock
-                    free();
-                } );
+                rating_service.request( request, response, quote, alias )
+                    .catch( () => {} )
+                    .then( () => free() );
             } );
         }, true );
     }

src/server/service/RatingService.ts

@@ -78,24 +78,22 @@ export class RatingService
     /**
      * Sends rates to the client
      *
-     * Note that the continuation will be called after all data saving is
+     * Note that the promise will be resolved after all data saving is
      * complete; the request will be sent back to the client before then.
      *
      * @param request   - user request to satisfy
      * @param _response - pending response
      * @param quote     - quote to export
      * @param cmd       - applicable of command request
-     * @param callback  - continuation after saving is complete
      *
-     * @return Server self to allow for method chaining
+     * @return result promise
      */
     request(
         request:   UserRequest,
         _response: UserResponse,
         quote:     ServerSideQuote,
         cmd:       string,
-        callback:  RequestCallback
-    )
+    ): Promise<void>
     {
         // cmd represents a request for a single rater
         if ( !cmd && this._isQuoteValid( quote ) )
@@ -105,23 +103,23 @@ export class RatingService
                 data: {},
             }, [] );
 
-            callback();
-            return this;
+            return Promise.resolve();
         }
 
         var program = quote.getProgram();
 
-        try
+        return new Promise( ( resolve, reject ) =>
         {
-            this._performRating( request, program, quote, cmd, callback );
-        }
-        catch ( err )
-        {
-            this._sendRatingError( request, quote, program, err );
-            callback();
-        }
-
-        return this;
+            try
+            {
+                this._performRating( request, program, quote, cmd, resolve );
+            }
+            catch ( err )
+            {
+                this._sendRatingError( request, quote, program, err );
+                reject( err );
+            }
+        } );
     }
 
 

test/server/service/RatingServiceTest.ts

@@ -19,7 +19,6 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-import { expect } from 'chai';
 import { RatingService as Sut } from "../../../src/server/service/RatingService";
 
 import { ClientActions } from "../../../src/client/action/ClientAction";
@@ -39,10 +38,13 @@ import {
     Callback as ServerDaoCallback
 } from "../../../src/server/db/ServerDao";
 
+import { expect, use as chai_use } from 'chai';
+chai_use( require( 'chai-as-promised' ) );
+
 
 describe( 'RatingService', () =>
 {
-    it( "saves rate data to own field", done =>
+    it( "saves rate data to own field", () =>
     {
         const {
             logger,
@@ -76,11 +78,35 @@ describe( 'RatingService', () =>
 
         const sut = new Sut( logger, dao, server, raters );
 
-        sut.request( request, response, quote, "", () =>
-        {
-            expect( saved_rates ).to.be.true;
-            done();
-        } );
+        return sut.request( request, response, quote, "" )
+            .then( () =>
+            {
+                expect( saved_rates ).to.be.true;
+            } );
+    } );
+
+
+    it( "rejects with error", () =>
+    {
+        const {
+            logger,
+            server,
+            raters,
+            dao,
+            request,
+            response,
+            quote,
+            rater,
+        } = getStubs();
+
+        const expected_error = new Error( "expected error" );
+
+        rater.rate = () => { throw expected_error; };
+
+        const sut = new Sut( logger, dao, server, raters );
+
+        return expect( sut.request( request, response, quote, "" ) )
+            .to.eventually.rejectedWith( expected_error );
     } );
 
 
@@ -116,7 +142,7 @@ describe( 'RatingService', () =>
                 }
             }( logger, dao, server, raters );
 
-            sut.request( request, response, quote, 'something', () => {} );
+            return sut.request( request, response, quote, 'something' );
         } );
 
         it( "calls getLastPremiumDate during #_performRating", done =>
@@ -157,7 +183,7 @@ describe( 'RatingService', () =>
                 return server;
             };
 
-            sut.request( request, response, quote, "", () => {} );
+            return sut.request( request, response, quote, "" );
         } );
 
     } );