Add basic system prune endpoint

Addresses exoframejs/exoframe#294

Author: yamalight

src/docker/util.js

@@ -32,3 +32,11 @@ exports.pullImage = tag =>
       stream.once('end', () => resolve(log));
     });
   });
+
+// prunes builder cache, unused images and volumes
+exports.pruneDocker = async () => {
+  // TODO: re-enable pruneBuilder once fixed in dockerode
+  // await docker.pruneBuilder();
+  const result = await Promise.all([docker.pruneImages(), docker.pruneVolumes()]);
+  return result;
+};

src/routes/index.js

@@ -8,6 +8,7 @@ const version = require('./version');
 const templates = require('./templates');
 const setup = require('./setup');
 const secrets = require('./secrets');
+const system = require('./system');
 
 module.exports = (fastify, opts, next) => {
   // enable auth for all routes
@@ -22,6 +23,7 @@ module.exports = (fastify, opts, next) => {
   templates(fastify);
   setup(fastify);
   secrets(fastify);
+  system(fastify);
 
   next();
 };

src/routes/system.js

@@ -0,0 +1,13 @@
+// our modules
+const {pruneDocker} = require('../docker/util');
+
+module.exports = fastify => {
+  fastify.route({
+    method: 'POST',
+    path: '/system/prune',
+    async handler(request, reply) {
+      const result = await pruneDocker();
+      reply.send({pruned: true, data: result});
+    },
+  });
+};