(POOLER-123) Implement a max TTL

Before this change, we could checkout a vm and set the lifetime to a
very high number which would esssentially keep the vm running forever.
Now implementing a config setting max_lifetime_upper_limit which enforces
a maximum lifetime in hours both for initial checkout and extending a
running vm

lib/vmpooler/api/v1.rb

@@ -892,6 +892,22 @@ module Vmpooler
             when 'lifetime'
               need_token! if Vmpooler::API.settings.config[:auth]
 
+              # in hours, defaults to one week
+              max_lifetime_upper_limit = config[:max_lifetime_upper_limit]
+              if max_lifetime_upper_limit
+                max_lifetime_upper_limit = max_lifetime_upper_limit.to_i
+                unless arg.to_i < max_lifetime_upper_limit
+                  failure = true
+                end
+                # also make sure we do not extend past max_lifetime_upper_limit
+                rdata = backend.hgetall('vmpooler__vm__' + params[:hostname])
+                running = ((Time.now - Time.parse(rdata['checkout'])) / 60 / 60).round(2)
+                unless running + arg.to_i < max_lifetime_upper_limit
+                  failure = true
+                end
+              end
+
+              # validate lifetime is within boundaries
               unless arg.to_i > 0
                 failure = true
               end

spec/helpers.rb

@@ -99,6 +99,10 @@ def fetch_vm(vm)
   redis.hgetall("vmpooler__vm__#{vm}")
 end
 
+def set_vm_data(vm, key, value)
+  redis.hset("vmpooler__vm__#{vm}", key, value)
+end
+
 def snapshot_revert_vm(vm, snapshot = '12345678901234567890123456789012')
   redis.sadd('vmpooler__tasks__snapshot-revert', "#{vm}:#{snapshot}")
   redis.hset("vmpooler__vm__#{vm}", "snapshot:#{snapshot}", "1")

spec/integration/api/v1/vm_hostname_spec.rb

@@ -20,12 +20,14 @@ describe Vmpooler::API::V1 do
         config: {
           'site_name' => 'test pooler',
           'vm_lifetime_auth' => 2,
+
         },
         pools: [
           {'name' => 'pool1', 'size' => 5},
           {'name' => 'pool2', 'size' => 10}
         ],
         alias: { 'poolone' => 'pool1' },
+        auth: false
       }
     }
 
@@ -34,7 +36,6 @@ describe Vmpooler::API::V1 do
     before(:each) do
       app.settings.set :config, config
       app.settings.set :redis, redis
-      app.settings.set :config, auth: false
       create_token('abcdefghijklmnopqrstuvwxyz012345', 'jdoe', current_time)
     end
 
@@ -122,6 +123,41 @@ describe Vmpooler::API::V1 do
           vm = fetch_vm('testhost')
           expect(vm['lifetime']).to be_nil
         end
+
+        it 'does not enforce a lifetime' do
+          create_vm('testhost')
+
+          put "#{prefix}/vm/testhost", '{"lifetime":"20000"}'
+          expect_json(ok = true, http = 200)
+
+          vm = fetch_vm('testhost')
+          expect(vm['lifetime']).to eq("20000")
+        end
+
+        it 'does not allow a lifetime to be initially past config 168' do
+          app.settings.set :config,
+                           { :config => { :max_lifetime_upper_limit => 168 } }
+          create_vm('testhost')
+
+          put "#{prefix}/vm/testhost", '{"lifetime":"200"}'
+          expect_json(ok = false, http = 400)
+
+          vm = fetch_vm('testhost')
+          expect(vm['lifetime']).to be_nil
+        end
+
+        it 'does not allow a lifetime to be extended past config 168' do
+          app.settings.set :config,
+                           { :config => { :max_lifetime_upper_limit => 168 } }
+          create_vm('testhost')
+
+          set_vm_data('testhost', "checkout", (Time.now - (69*60*60)))
+          put "#{prefix}/vm/testhost", '{"lifetime":"100"}'
+          expect_json(ok = false, http = 400)
+
+          vm = fetch_vm('testhost')
+          expect(vm['lifetime']).to be_nil
+        end
       end
 
       context '(auth configured)' do

vmpooler.yaml.example

@@ -498,6 +498,12 @@
 #     Expects a boolean value
 #     (optional; default: false)
 #
+#   - max_lifetime_upper_limit
+#     Sets a lifetime upper limit (in hours) for how long the vm lifetime can be set via the API. Lifetime can be set and extended
+#     so this configuration is used to enforce an upper limit to both the initial lifetime request and/or the extended
+#     lifetime (by checking how long it has already been running).
+#     (optional; default: unlimited)
+#
 # Example:
 
 :config: