expose git-commit from bundle (app-sre#79)

Author: maorfr

src/db.ts

@@ -25,6 +25,7 @@ export type Bundle = {
   resourcefiles: im.Map<string, Resourcefile>;
   schema: any[];
   fileHash: string;
+  gitCommit: string;
 };
 
 const getRefPath = (ref: string): string => /^[^$]*/.exec(ref)[0];
@@ -64,6 +65,7 @@ const parseBundle = (contents: string) : Bundle => {
     datafiles: parseDatafiles(parsedContents.data),
     resourcefiles: parseResourcefiles(parsedContents.resources),
     fileHash: hashDatafile(contents),
+    gitCommit: parsedContents['git_commit'],
     schema: parsedContents.graphql,
   } as Bundle;
 };
@@ -141,6 +143,7 @@ export const bundleFromEnvironment = async() => {
         resourcefiles: im.Map<string, Resourcefile>(),
         schema: {},
         fileHash: '',
+        gitCommit: '',
       } as Bundle;
   }
 };

src/server.ts

@@ -137,6 +137,11 @@ export const appFromBundle = async (bundle: Promise<db.Bundle>) => {
     res.send(hash);
   });
 
+  app.get('/git-commit', (req: express.Request, res: express.Response) => {
+    const git_commit = req.app.get('bundle').gitCommit;
+    res.send(git_commit);
+  });
+
   app.get('/metrics', (req: express.Request, res: express.Response) => {
     res.send(promClient.register.metrics());
   });