// </CreateRelationshipMethod>
// <UpdateRelationshipMethod>
private async static Task CustomMethod_UpdateRelationshipAsync(DigitalTwinsClient client, string srcId, string relId, Azure.JsonPatchDocument updateDocument)
{
try
{
await client.UpdateRelationshipAsync(srcId, relId, updateDocument);
Console.WriteLine($"Successfully updated {relId}");
}
catch (RequestFailedException rex)
{
Console.WriteLine($"Update relationship error: {rex.Status}:{rex.Message}");
}
}
public async static void Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log)
{
if (adtInstanceUrl == null)
{
log.LogError("Application setting \"ADT_SERVICE_URL\" not set");
return;
}
try
{
// INSERT authentication code below here
ManagedIdentityCredential cred = new ManagedIdentityCredential("https://digitaltwins.azure.net");
DigitalTwinsClient client = new DigitalTwinsClient(new Uri(adtInstanceUrl), cred, new DigitalTwinsClientOptions {
Transport = new HttpClientTransport(httpClient)
});
log.LogInformation($"Azure digital twins service client connection created.");
// INSERT event processing code below here
if (eventGridEvent != null && eventGridEvent.Data != null)
{
string twinId = eventGridEvent.Subject.ToString();
JObject message = (JObject)JsonConvert.DeserializeObject(eventGridEvent.Data.ToString());
log.LogInformation($"Reading event from {twinId}: {eventGridEvent.EventType}: {message["data"]}");
// INSERT process Cheese Cave Device events here
if (message["data"]["modelId"] != null && (string)message["data"]["modelId"] == "dtmi:com:contoso:digital_factory:cheese_factory:cheese_cave_device;1")
{
// INSERT Find the device parent model (the Cheese Cave)
AsyncPageable <IncomingRelationship> rels = client.GetIncomingRelationshipsAsync(twinId);
string parentId = null;
await foreach (IncomingRelationship ie in rels)
{
if (ie.RelationshipName == "rel_has_devices")
{
parentId = ie.SourceId;
break;
}
}
if (parentId == null)
{
log.LogError($"Unable to find parent for {twinId}");
}
else
{
// INSERT Update the parent
// Read properties which values have been changed in each operation
var patch = new Azure.JsonPatchDocument();
foreach (var operation in message["data"]["patch"])
{
string opValue = (string)operation["op"];
if (opValue.Equals("replace"))
{
string propertyPath = ((string)operation["path"]);
if (mappedProperties.Contains(propertyPath))
{
var value = operation["value"].Value <bool>();
patch.AppendReplace <bool>(propertyPath, value);
log.LogInformation($"Updating parent {parentId}: {propertyPath} = {value}");
}
}
}
await client.UpdateDigitalTwinAsync(parentId, patch);
}
}
else
{
log.LogInformation($"Source model is not a Cheese Cave Device: {(message["data"]["modelId"] != null ? (string)message["data"]["modelId"] : "null")}");
}
}
}
catch (Exception e)
{
log.LogError(e.Message);
}
}