private DeviceModel.DeviceModelMessageSchema GetDeviceModelMessageSchema()
{
var schema = new DeviceModel.DeviceModelMessageSchema()
{
Name = "chiller-sensors",
Format = DeviceModel.DeviceModelMessageSchemaFormat.JSON,
Fields = new Dictionary <string, DeviceModel.DeviceModelMessageSchemaType>()
{
{ "cargotemperature", DeviceModel.DeviceModelMessageSchemaType.Double }
}
};
return(schema);
}
public async Task SendMessageAsync(string message, DeviceModel.DeviceModelMessageSchema schema)
{
var eventMessage = new Message(Encoding.UTF8.GetBytes(message));
eventMessage.Properties.Add(CREATION_TIME_PROPERTY, DateTimeOffset.UtcNow.ToString(DATE_FORMAT));
eventMessage.Properties.Add(MESSAGE_SCHEMA_PROPERTY, schema.Name);
eventMessage.Properties.Add(CONTENT_PROPERTY, "JSON");
await this.SendRawMessageAsync(eventMessage);
this.log.Debug("SendMessageAsync for device", () => new
{
this.deviceId
});
}
/// <summary>Map a service model to the corresponding API model</summary>
public DeviceModelMessageSchemaApiModel(DeviceModel.DeviceModelMessageSchema schema) : this()
{
if (schema == null)
{
return;
}
this.Name = schema.Name;
this.Format = schema.Format.ToString();
foreach (var field in schema.Fields)
{
this.Fields.Add(field.Key, field.Value.ToString());
}
}
private async Task SendProtobufMessageAsync(string message, DeviceModel.DeviceModelMessageSchema schema)
{
var eventMessage = default(Message);
string className = schema.ClassName;
Type type = System.Reflection.Assembly.GetExecutingAssembly().GetType(schema.ClassName, false);
if (type != null)
{
object jsonObj = JsonConvert.DeserializeObject(message, type);
MethodInfo methodInfo = Utilities.GetExtensionMethod("imessage", "Google.Protobuf", "ToByteArray");
if (methodInfo != null)
{
object result = methodInfo.Invoke(jsonObj, new object[] { jsonObj });
if (result != null)
{
byte[] byteArray = result as byte[];
eventMessage = new Message(byteArray);
eventMessage.Properties.Add(CLASSNAME_PROPERTY, schema.ClassName);
}
else
{
throw new InvalidDataException("Json message transformation to byte array yielded null");
}
}
else
{
throw new ResourceNotFoundException($"Method: ToByteArray not found in {schema.ClassName}");
}
}
else
{
throw new ResourceNotFoundException($"Type: {schema.ClassName} not found");
}
eventMessage.Properties.Add(CREATION_TIME_PROPERTY, DateTimeOffset.UtcNow.ToString(DATE_FORMAT));
eventMessage.Properties.Add(MESSAGE_SCHEMA_PROPERTY, schema.Name);
eventMessage.Properties.Add(CONTENT_PROPERTY, schema.Format.ToString());
eventMessage.MessageSchema = schema.Name;
eventMessage.CreationTimeUtc = DateTime.UtcNow;
this.log.Debug("Sending message from device",
() => new { this.deviceId, Schema = schema.Name });
await this.SendRawMessageAsync(eventMessage);
}
private async Task SendJsonMessageAsync(string message, DeviceModel.DeviceModelMessageSchema schema)
{
var eventMessage = default(Message);
eventMessage = new Message(Encoding.UTF8.GetBytes(message));
eventMessage.ContentType = "application/json";
eventMessage.ContentEncoding = "utf-8";
eventMessage.Properties.Add(CREATION_TIME_PROPERTY, DateTimeOffset.UtcNow.ToString(DATE_FORMAT));
eventMessage.Properties.Add(MESSAGE_SCHEMA_PROPERTY, schema.Name);
eventMessage.Properties.Add(CONTENT_PROPERTY, schema.Format.ToString());
eventMessage.MessageSchema = schema.Name;
eventMessage.CreationTimeUtc = DateTime.UtcNow;
this.log.Debug("Sending message from device",
() => new { this.deviceId, Schema = schema.Name });
await this.SendRawMessageAsync(eventMessage);
}
public async Task SendMessageAsync(string message, DeviceModel.DeviceModelMessageSchema schema)
{
switch (schema.Format)
{
case DeviceModel.DeviceModelMessageSchemaFormat.JSON:
await this.SendJsonMessageAsync(message, schema);
break;
case DeviceModel.DeviceModelMessageSchemaFormat.Protobuf:
await this.SendProtobufMessageAsync(message, schema);
break;
default:
throw new UnknownMessageFormatException($"Message format {schema.Format.ToString()} is invalid. Check the Telemetry format against the permitted values Binary, Text, Json, Protobuf");
}
}
// Map service model to API model
public static DeviceModelTelemetryMessageSchema FromServiceModel(DeviceModel.DeviceModelMessageSchema value)
{
if (value == null)
{
return(null);
}
var result = new DeviceModelTelemetryMessageSchema
{
Name = value.Name,
Format = value.Format.ToString()
};
foreach (var field in value.Fields)
{
result.Fields.Add(field.Key, field.Value.ToString());
}
return(result);
}