public static async Task Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log)
{
log.LogInformation("Start execution");
// After this is deployed, you'll need to turn the Azure Function Identity Status "On",
// grab Object ID of the function, and assign "Azure Digital Twins Owner (Preview)" role to this function identity
// in order for this function to be authorized on ADT APIs.
//
// If you are following "Tutorial: Connect an end-to-end solution" in the Azure Digital Twins documentation,
// you have done this already with an equivalent CLI step in the "Assign permissions to the function app" section.
DigitalTwinsClient client;
// Authenticate on ADT APIs
try
{
var credentials = new DefaultAzureCredential();
client = new DigitalTwinsClient(new Uri(adtServiceUrl), credentials, new DigitalTwinsClientOptions {
Transport = new HttpClientTransport(httpClient)
});
log.LogInformation("ADT service client connection created.");
}
catch (Exception e)
{
log.LogError($"ADT service client connection failed. {e}");
return;
}
if (client != null)
{
if (eventGridEvent != null && eventGridEvent.Data != null)
{
string twinId = eventGridEvent.Subject.ToString();
JObject message = (JObject)JsonConvert.DeserializeObject(eventGridEvent.Data.ToString());
log.LogInformation($"Reading event from {twinId}: {eventGridEvent.EventType}: {message["data"]}");
//Find and update parent Twin
string parentId = await AdtUtilities.FindParentAsync(client, twinId, "contains", log);
if (parentId != null)
{
// Read properties which values have been changed in each operation
foreach (var operation in message["data"]["patch"])
{
string opValue = (string)operation["op"];
if (opValue.Equals("replace"))
{
string propertyPath = ((string)operation["path"]);
if (propertyPath.Equals("/Temperature"))
{
await AdtUtilities.UpdateTwinPropertyAsync(client, parentId, propertyPath, operation["value"].Value <float>(), log);
}
}
}
}
}
}
}
public static async Task Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log)
{
log.LogInformation("Start execution");
// After this is deployed, you need to turn the Identity Status "On",
// Grab Object Id of the function and assigned "Azure Digital Twins Owner (Preview)" role to this function identity
// in order for this function to be authorize on ADT APIs.
DigitalTwinsClient client;
// Authenticate on ADT APIs
try
{
ManagedIdentityCredential cred = new ManagedIdentityCredential(adtAppId);
client = new DigitalTwinsClient(new Uri(adtInstanceUrl), cred, new DigitalTwinsClientOptions {
Transport = new HttpClientTransport(httpClient)
});
log.LogInformation("ADT service client connection created.");
}
catch (Exception e)
{
log.LogError($"ADT service client connection failed. {e}");
return;
}
if (client != null)
{
try
{
if (eventGridEvent != null && eventGridEvent.Data != null)
{
string twinId = eventGridEvent.Subject.ToString();
JObject message = (JObject)JsonConvert.DeserializeObject(eventGridEvent.Data.ToString());
log.LogInformation($"Reading event from {twinId}: {eventGridEvent.EventType}: {message["data"]}");
//Find and update parent Twin
string parentId = await AdtUtilities.FindParentAsync(client, twinId, "contains", log);
if (parentId != null)
{
// Read properties which values have been changed in each operation
foreach (var operation in message["data"]["patch"])
{
string opValue = (string)operation["op"];
if (opValue.Equals("replace"))
{
string propertyPath = ((string)operation["path"]);
object propertyValue = (object)operation["value"];
if (propertyPath.Equals("/Temperature"))
{
await AdtUtilities.UpdateTwinPropertyAsync(client, parentId, propertyPath, propertyValue, log);
}
}
}
}
}
}
catch (Exception e)
{
log.LogError(e.ToString());
}
}
}
