[ADD]graphiqlRouter option in config

.gitignore

@@ -9,3 +9,4 @@ run
 test/fixtures/apps/model-app/run/
 .vscode/
 yarn.lock
+yarn-error.log

app/middleware/graphql.js

@@ -4,10 +4,13 @@
 // directly exposed to the public, now we must still use that for the middle-
 // ware.
 const { graphqlKoa } = require('apollo-server-koa/dist/koaApollo');
+const { FormatErrorExtension } = require('apollo-server-core/dist/formatters');
 
 // This has been newly imported, because in v2 of apollo-server, this is removed.
 const { resolveGraphiQLString } = require('apollo-server-module-graphiql');
 
+const { koa: voyagerMiddleware } = require('graphql-voyager/middleware');
+
 /**
  This function is directly copied from:
  https://github.com/apollographql/apollo-server/blob/300c0cd12b56be439b206d55131e1b93a9e6dade/packages/apollo-server-koa/src/koaApollo.ts#L51
@@ -36,12 +39,28 @@ function graphiqlKoa(options) {
 module.exports = (_, app) => {
   const options = app.config.graphql;
   const graphQLRouter = options.router;
+  options.graphiqlRouter = options.graphiqlRouter ? options.graphiqlRouter : graphQLRouter;
+  const voyagerRouter = options.voyagerRouter;
   let graphiql = true;
 
   if (options.graphiql === false) {
     graphiql = false;
   }
 
+  let voyager = true;
+  if (options.voyager === false) {
+    voyager = false;
+  }
+
+  const extensions = [];
+  if (options.formatError && typeof options.formatError === 'function') {
+    const formatErrorExtension = () => new FormatErrorExtension(
+      options.formatError,
+      options.debug,
+    );
+    extensions.push(formatErrorExtension);
+  }
+
   return async (ctx, next) => {
     /* istanbul ignore else */
     if (ctx.path === graphQLRouter) {
@@ -50,7 +69,7 @@ module.exports = (_, app) => {
           await options.onPreGraphiQL(ctx);
         }
         return graphiqlKoa({
-          endpointURL: graphQLRouter,
+          endpointURL: options.graphiqlRouter,
         })(ctx);
       }
       if (options.onPreGraphQL) {
@@ -59,7 +78,12 @@ module.exports = (_, app) => {
       return graphqlKoa({
         schema: app.schema,
         context: ctx,
+        extensions,
       })(ctx);
+    } else if (voyager && ctx.path === voyagerRouter) {
+      return voyagerMiddleware({
+        endpointURL: options.graphiqlRouter,
+      })(ctx, next);
     }
     await next();
   };

config/config.default.js

@@ -2,4 +2,6 @@
 
 exports.graphql = {
   router: '/graphql',
+  voyagerRouter: '/graphdoc',
+  debug: true,
 };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "egg-graphql",
-  "version": "2.1.0",
+  "version": "2.0.4",
   "description": "egg graphql plugin",
   "eggPlugin": {
     "name": "graphql"
@@ -18,6 +18,7 @@
     "graphql": "^0.13.2",
     "graphql-tag": "^2.9.2",
     "graphql-tools": "^3.1.1",
+    "graphql-voyager": "^1.0.0-rc.25",
     "lodash": "^4.17.10"
   },
   "devDependencies": {