fix(agent): Add fallbacks for regions without signers

Closes #356

src/fileUploadMeta/getSigner.js

@@ -4,9 +4,23 @@ const supported = new Map(SUPPORTED_SIGNER_REGIONS);
 // allow us-east-1 for signer util
 supported.set('us-east-1', true);
 
+const fallbackSigners = {
+  'ap-northeast-2': 'ap-northeast-1',
+  'ap-south-1': 'ap-southeast-2',
+  'ap-southeast-1': 'ap-southeast-2',
+  'ap-southeast-2': 'ap-southeast-2',
+  'ca-central-1': 'us-east-2',
+  'eu-central-1': 'eu-west-1',
+  'eu-west-2': 'eu-west-1',
+  'eu-east-1': 'eu-east-1',
+  'us-west-1': 'us-west-1'
+};
+
 export default function getSignerHostname() {
   const { AWS_REGION } = process.env;
-  return `https://signer.${
-    supported.has(AWS_REGION) ? AWS_REGION : 'us-west-2'
-  }.iopipe.com/`;
+  const signer = supported.has(AWS_REGION)
+    ? AWS_REGION
+    : fallbackSigners[AWS_REGION];
+
+  return `https://signer.${signer ? signer : 'us-west-2'}.iopipe.com/`;
 }

src/fileUploadMeta/getSigner.test.js

@@ -15,7 +15,7 @@ describe('getSigner', () => {
   });
 
   test('Uses us-west-2 if region is not supported', () => {
-    process.env.AWS_REGION = 'eu-west-2';
+    process.env.AWS_REGION = 'eu-west-3';
     expect(lib()).toEqual('https://signer.us-west-2.iopipe.com/');
   });
 });

src/index.test.js

@@ -294,18 +294,5 @@ describe('smoke test', () => {
         sendToRegionTest(region, done);
       });
     }
-
-    test('sends to custom URLs (staging)', done => {
-      runWrappedFunction(
-        undefined,
-        undefined,
-        createAgent({
-          url: 'https://metrics-api-staging.iopipe.com'
-        })
-      ).then(obj => {
-        expect(obj.response).toEqual('Success');
-        done();
-      });
-    });
   });
 });