private bool Subscribe(SubscriptionItem item, HttpTargetSite target)
{
bool ok = false;
WireData data = null;
BaseServiceNode serviceNode = _service.Children
.Where((IIotNode node) => string.Equals(node.Id, item.Node, StringComparison.OrdinalIgnoreCase)).FirstOrDefault()
as BaseServiceNode;
if (serviceNode != null)
{
if (string.IsNullOrEmpty(item.Data))
{
serviceNode.Subscribe(target);
ok = true;
}
else
{
data = serviceNode.GetData <WireData>(item.Data);
if (data != null)
{
data.Subscribe(target);
ok = true;
}
}
}
return(ok);
}
/// <summary>
/// subscribe sensor data change notification
/// </summary>
public void Subscribe(HttpTargetSite endpoint)
{
foreach (ISubscribe item in Children)
{
item.Subscribe(endpoint);
}
}
/// <summary>
/// subscribe sensor data change notification
/// </summary>
/// <param name="targetAddress">the target service's address (ipaddress:port)</param>
/// <param name="credential">the credential for requests to target service (user:password)</param>
/// <param name="token">the token to be included for every requests</param>
public void Subscribe(string targetAddress, string credential, string token)
{
HttpTargetSite endpoint = new HttpTargetSite {
Server = targetAddress, Credential = credential, Token = token
};
Subscribe(endpoint);
}
/// <summary>
/// derived class must implement to handle Post request
/// </summary>
protected override HttpServiceResponse ProcessPostRequest(HttpServiceContext context)
{
SubscriptionData subscriptionData = null;
string json = GetFromRequestStream(context.Context.Request);
try
{
subscriptionData = JsonConvert.DeserializeObject <SubscriptionData>(json);
}
catch (Exception err)
{
return(CreateResponseForBadRequest(context, Name, $"InvalidSubscription: {json}"));
}
if (!ValidateSubscriptionData(subscriptionData))
{
return(CreateResponseForBadRequest(context, Name));
}
HttpServiceResponse response = null;
HttpTargetSite target = subscriptionData.Target;
string invalidList = string.Empty;
int okCount = 0;
foreach (SubscriptionItem item in subscriptionData.Items)
{
bool ok = Subscribe(item, target);
if (ok)
{
okCount++;
}
else
{
if (!string.IsNullOrEmpty(invalidList))
{
invalidList += ", ";
}
invalidList += $"{item.Node}.{item.Data}";
}
}
if (string.IsNullOrEmpty(invalidList))
{
response = CreateSuccessResponse(context, Name, 200, null);
}
else
{
string invalidJson = $"{{\"subscriptionError\": \"{invalidList}\"}}";
if (okCount > 0)
{
response = CreateSuccessResponse(context, Name, 206, invalidJson);
}
else
{
CreateResponse(context, Name, false, 400, invalidJson);
}
}
return(response);
}
/// <summary>
/// subscribe sensor data change notification
/// </summary>
/// <param name="endpoint">the target HttpTargetEndpoint</param>
public virtual void Subscribe(HttpTargetSite endpoint)
{
_notifications.Add(endpoint);
}
