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Avoid racing, only hand over VMs after a successful smove

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This commit is contained in:
Scott Schneider 2013-12-05 11:44:11 -08:00
parent 674a3eaf6f
commit c261baeb3b
1 changed files with 18 additions and 6 deletions
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24
vmware-host-pooler-api
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@ -62,14 +62,26 @@ post '/vm/:template' do
result[params[:template]]['error'] = 'You must specify a destination \'folder\' and \'pool\''
else
if ( $redis.scard('vmware_host_pool__ready__'+params[:template]) > 0 )
vm = $redis.srandmember('vmware_host_pool__ready__'+params[:template])
$redis.srem('vmware_host_pool__ready__'+params[:template], vm)
$redis.sadd('vmware_host_pool__running__'+params[:template], vm)
vm = nil
logger.log('s', "[<] '#{vm}' moved to 'running' queue")
try = $redis.srandmember('vmware_host_pool__ready__'+params[:template])
result[params[:template]]['ok'] = true
result[params[:template]]['hostname'] = vm
if (
$redis.smove(
'vmware_host_pool__ready__'+params[:template],
'vmware_host_pool__running__'+params[:template],
try
)
)
vm = try
logger.log('s', "[<] '#{vm}' moved to 'running' queue")
result[params[:template]]['ok'] = true
result[params[:template]]['hostname'] = vm
else
result[params[:template]]['ok'] = false
end
else
result[params[:template]]['ok'] = false
end