public async Task AddVMEntityAsync(VMDetails newVM)
{
ValidateVMDetails(newVM);
CloudTable table = tableClient.GetTableReference(tableName);
TableOperation insertOperation = TableOperation.Insert(newVM);
await table.ExecuteAsync(insertOperation);
}
public async Task ModifyVMDetailsAsync(VMDetails updatedVM)
{
ValidateVMDetails(updatedVM);
updatedVM.ETag = "*"; //required for the Merge operation
CloudTable table = tableClient.GetTableReference(tableName);
TableOperation updateOperation = TableOperation.Merge(updatedVM);
var x = await table.ExecuteAsync(updateOperation);
}
public void ValidateVMDetails(VMDetails entity)
{
if (string.IsNullOrEmpty(entity.VMID))
{
throw new ArgumentException($"{nameof(entity.VMID)} should not be null");
}
if (string.IsNullOrEmpty(entity.ResourceGroup))
{
throw new ArgumentException($"{nameof(entity.ResourceGroup)} should not be null");
}
}
public async Task ModifyVMStateByIdAsync(string VMID, VMState state)
{
if (string.IsNullOrEmpty(VMID))
{
throw new Exception($"{nameof(VMID)} should have a value");
}
CloudTable table = tableClient.GetTableReference(tableName);
VMDetails vm = await GetVMByID(VMID);
vm.State = state;
TableOperation updateOperation = TableOperation.Merge(vm);
await table.ExecuteAsync(updateOperation);
}
public static async Task StartDeallocatedVMAsync(VMDetails vm)
{
// not awaiting here intentionally, since we want to return response immediately
var task = AzureMgmtCredentials.Instance.Azure
.VirtualMachines.StartAsync(vm.ResourceGroup, vm.VMID);
// we do not wait for VM start to complete
// so let's give it few seconds to start and return in case we have deployment exception
// like service principal error
await Task.WhenAny(task, Task.Delay(1000));
if (task.IsCompleted && task.IsFaulted)
{
throw task.Exception;
}
}
public static async Task <HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Function, "post", Route = "node/create")] HttpRequestMessage req, TraceWriter log, ExecutionContext context)
{
var content = await req.Content.ReadAsStringAsync();
var nodeParams = JsonConvert.DeserializeObject <NodeParameters>(content);
var err = ValidateRequest(req, nodeParams, log);
if (err != null)
{
return(err);
}
//find out if there is any VM in MarkedForDeallocation state
var vm = (await TableStorageHelper.Instance.GetMatchingVMsInStateAsync(
nodeParams.ResourceGroup, nodeParams.Region,
nodeParams.Size, VMState.MarkedForDeallocation))
.FirstOrDefault();
if (vm != null)
{
//set it as running so as not to be deallocated when game rooms are 0
vm.State = VMState.Running;
await TableStorageHelper.Instance.ModifyVMDetailsAsync(vm);
//we're done, this VM can now be used
return(req.CreateResponse(HttpStatusCode.OK,
JsonConvert.SerializeObject(vm),
"application/json"));
}
//search if there are any deallocated VMs
var deallocatedVM = (await TableStorageHelper.Instance
.GetMatchingVMsInStateAsync(nodeParams.ResourceGroup, nodeParams.Region, nodeParams.Size, VMState.Deallocated))
.FirstOrDefault();
//no deallocated VMs, so let's create a new one
if (deallocatedVM == null)
{
string vmName = "node" + System.Guid.NewGuid().ToString("N").Substring(0, 7);
string sshKey = ConfigurationManager.AppSettings["VM_ADMIN_KEY"]?.ToString()
?? System.IO.File.ReadAllText(context.FunctionAppDirectory + "/default_key_rsa.pub");
string deploymentTemplate = System.IO.File.ReadAllText(context.FunctionAppDirectory + "/vmDeploy.json");
await DeployNodeAsync(vmName, nodeParams, sshKey, deploymentTemplate, log);
var details = new VMDetails(vmName, nodeParams.ResourceGroup, VMState.Creating,
nodeParams.Size, nodeParams.Region);
await TableStorageHelper.Instance.AddVMEntityAsync(details);
return(req.CreateResponse(HttpStatusCode.OK,
JsonConvert.SerializeObject(details),
"application/json"));
}
else//there's at least one deallocated VM, so start the .First() one
{
await AzureAPIHelper.StartDeallocatedVMAsync(deallocatedVM);
deallocatedVM.State = VMState.Creating;
await TableStorageHelper.Instance.ModifyVMDetailsAsync(deallocatedVM);
return(req.CreateResponse(HttpStatusCode.OK,
JsonConvert.SerializeObject(deallocatedVM),
"application/json"));
}
}