Crude log mocking

This will need to get better for testing the offset stitching
logic in the polling case.

ui/mirage/config.js

@@ -1,6 +1,7 @@
 import Ember from 'ember';
 import Response from 'ember-cli-mirage/response';
 import { HOSTS } from './common';
+import { logFrames, logEncode } from './data/logs';
 
 const { copy } = Ember;
 
@@ -166,6 +167,24 @@ export default function() {
     this.get(`http://${host}/v1/client/stats`, function({ clientStats }) {
       return this.serialize(clientStats.find(host));
     });
+
+    this.get(`http://${host}/v1/client/fs/logs/:allocation_id`, function(
+      server,
+      { params, queryParams }
+    ) {
+      const allocation = server.allocations.find(params.allocation_id);
+      const groups = server.taskGroups.findBy({ jobId: allocation.jobId });
+
+      if (!groups.mapBy('name').includes(queryParams.task)) {
+        return new Response(400, {}, 'must include task name');
+      }
+
+      if (queryParams.plain) {
+        return logFrames.join('');
+      }
+
+      return logEncode(logFrames, logFrames.length - 1);
+    });
   });
 }
 

ui/mirage/data/logs.js

@@ -0,0 +1,16 @@
+export const logFrames = [
+  'hello world\n',
+  'some more output\ngoes here\n\n--> potentially helpful',
+  ' hopefully, at least.\n',
+];
+
+export const logEncode = (frames, index) => {
+  return frames
+    .slice(index)
+    .map(frame => window.btoa(frame))
+    .map((frame, innerIndex) => {
+      const offset = frames.slice(innerIndex).reduce((sum, frame) => sum + frame.length, 0);
+      return JSON.stringify({ Offset: offset, Data: frame });
+    })
+    .join('');
+};