Make express jsonrpc use a builder pattern

packages/jsonrpc/src/express.test.ts

@@ -56,16 +56,17 @@ describe('jsonrpc', () => {
   function createApp() {
     const app = express()
     app.use(bodyParser.json())
-    app.use('/myService',
+    app.use('/',
       jsonrpc(req => ({userId: 1000}), noopLogger)
-      .addService(new Service(5), [
+      .addService('/myService', new Service(5), [
         'add',
         'delay',
         'syncError',
         'asyncError',
         'httpError',
         'addWithContext',
-      ]),
+      ])
+      .router(),
     )
     return app
   }

packages/jsonrpc/src/express.ts

@@ -43,19 +43,20 @@ export function jsonrpc<Context>(
     res.json(errorResponse)
   }
 
-  return {
+  const router = Router()
+
+  const self = {
    /**
     * Adds middleware for handling JSON RPC requests. Expects JSON middleware to
     * already be configured.
     */
     addService<T, F extends FunctionPropertyNames<T>>(
+      path: string,
       service: T,
       methods: F[],
     ) {
       const rpcService = createRpcService(service, methods)
 
-      const router = Router()
-
       function handleResponse(
         response: ISuccessResponse<unknown> | null,
         res: Response,
@@ -68,7 +69,7 @@ export function jsonrpc<Context>(
         }
       }
 
-      router.get('/', (req, res, next) => {
+      router.get(path, (req, res, next) => {
         if (!idempotentMethodRegex.test(req.query.method)) {
           // TODO fix status code and error type
           const err = createError(ERROR_METHOD_NOT_FOUND, {
@@ -89,18 +90,21 @@ export function jsonrpc<Context>(
         .catch(next)
       })
 
-      router.post('/', (req, res, next) => {
+      router.post(path, (req, res, next) => {
         rpcService.invoke(req.body, getContext(req))
         .then(response => handleResponse(response, res))
         .catch(next)
       })
 
-      router.use('/', handleError)
-
+      router.use(path, handleError)
+      return self
+    },
+    router() {
       return router
     },
   }
 
+  return self
 }
 
 function getRequestId(req: express.Request) {

packages/jsonrpc/src/redux.test.ts

@@ -55,11 +55,12 @@ describe('createActions', () => {
 
   const app = express()
   app.use(bodyParser.json())
-  app.use('/service', jsonrpc(() => ({userId: 1000}), noopLogger)
-    .addService(
-      new Service(),
-      keys<IService>(),
-    ))
+  app.use(
+    '/',
+    jsonrpc(() => ({userId: 1000}), noopLogger)
+    .addService('/service', new Service(), keys<IService>())
+    .router(),
+  )
 
   let baseUrl: string
   let server: Server

packages/jsonrpc/src/remote.test.ts

@@ -35,8 +35,12 @@ describe('remote', () => {
   function createApp() {
     const a = express()
     a.use(bodyParser.json())
-    a.use('/myService', jsonrpc(() => ({}), noopLogger)
-      .addService(service, IServiceKeys))
+    a.use(
+      '/',
+      jsonrpc(() => ({}), noopLogger)
+      .addService('/myService', service, IServiceKeys)
+      .router(),
+    )
     return a
   }