public async void Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log)
{
// After this is deployed, you need to turn the Managed Identity Status to "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 authorized on ADT APIs.
log.LogInformation(eventGridEvent.Data.ToString());
try
{
// Authenticate on ADT APIs
var cred = new ManagedIdentityCredential(adtAppId);
var client = new DigitalTwinsClient(new Uri(adtInstanceUrl), cred, new DigitalTwinsClientOptions {
Transport = new HttpClientTransport(httpClient)
});
log.LogInformation($"ADT service client connection created.");
if (client != null)
{
if (eventGridEvent != null && eventGridEvent.Data != null)
{
#region Open this region for message format information
// Telemetry message format
//{
// "properties": { },
// "systemProperties":
// {
// "iothub-connection-device-id": "thermostat1",
// "iothub-connection-auth-method": "{\"scope\":\"device\",\"type\":\"sas\",\"issuer\":\"iothub\",\"acceptingIpFilterRule\":null}",
// "iothub-connection-auth-generation-id": "637199981642612179",
// "iothub-enqueuedtime": "2020-03-18T18:35:08.269Z",
// "iothub-message-source": "Telemetry"
// },
// "body": "eyJUZW1wZXJhdHVyZSI6NzAuOTI3MjM0MDg3MTA1NDg5fQ=="
//}
#endregion
// Reading deviceId from message headers
log.LogInformation(eventGridEvent.Data.ToString());
JObject job = (JObject)JsonConvert.DeserializeObject(eventGridEvent.Data.ToString());
string deviceId = (string)job["systemProperties"]["iothub-connection-device-id"];
log.LogInformation($"Found device: {deviceId}");
// Extracting temperature from device telemetry
byte[] body = Convert.FromBase64String(job["body"].ToString());
var value = Encoding.ASCII.GetString(body);
var bodyProperty = (JObject)JsonConvert.DeserializeObject(value);
JToken temperature = bodyProperty["Temperature"];
log.LogInformation($"Device Temperature is ({temperature.Type}): {temperature}");
// Update device Temperature property
await AdtUtilities.UpdateTwinPropertyAsync(client, deviceId, "/Temperature", temperature.Value <float>(), log);
}
}
}
catch (Exception e)
{
log.LogError($"Error: {e.Message}");
}
}
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());
}
}
}
public static async Task Run([EventGridTrigger] EventGridEvent eventGridEvent, ILogger log)
{
// 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 = null;
log.LogInformation("start execution");
// 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.ToString());
return;
}
if (client != null)
{
try
{
if (eventGridEvent != null && eventGridEvent.Data != null)
{
#region Open this region for message format information
// Known Issue: you cannot read the header event type in telemetry or notifications,
// you cannot read notification properties for now until CE format it's implemented
// Therefore you have to parse the notification for "Operations" (for now)
// Read property change events, format looks like this
//{
// "data":
// {
// "TwinId": "room1",
// "Operations":
// [
// {"op": "replace", "path": "/Temperature", "value": 70},
// {"op": "replace", "path": "/Humidity","value": 49 }
// ]
// }
// }
// Device Telemetry message
//{
// "properties": { },
// "systemProperties":
// {
// "iothub-connection-device-id": "thermostat1",
// "iothub-connection-auth-method": "{\"scope\":\"device\",\"type\":\"sas\",\"issuer\":\"iothub\",\"acceptingIpFilterRule\":null}",
// "iothub-connection-auth-generation-id": "637199981642612179",
// "iothub-enqueuedtime": "2020-03-18T18:35:08.269Z",
// "iothub-message-source": "Telemetry"
// },
// "body": "eyJUZW1wZXJhdHVyZSI6NzAuOTI3MjM0MDg3MTA1NDg5fQ=="
//}
#endregion
string evt = eventGridEvent.Data.ToString();
log.LogInformation(evt);
JObject message = (JObject)JsonConvert.DeserializeObject(evt);
// Read twin id
string twinId = (string)message["TwinId"];
log.LogInformation($"Found updates on twin: {twinId}");
// Validate "Operations" and TwinId
if ((message["Operations"] == null || message["Operations"].Count() == 0) && String.IsNullOrEmpty(twinId))
{
log.LogInformation($"No twin property change events");
}
//string parent = await FindParent(twinId, "contains", log);
string parentId = await AdtUtilities.FindParentByQuery(client, twinId, log);
if (parentId != null)
{
// Read properties which values have been changed in each operation
foreach (var operation in message["Operations"])
{
string opValue = (string)operation["op"];
if (opValue.Equals("replace"))
{
string propertyPath = ((string)operation["path"]);
string propertyValue = (string)operation["value"];
if (propertyPath.Equals("/Temperature"))
{
await AdtUtilities.UpdateTwinProperty(client, parentId, "replace", propertyPath, "double", propertyValue, log);
}
}
}
}
}
}
catch (Exception e)
{
log.LogError($"*** Unable to create client connection {e}");
}
}
}