public Task <ITriggerData> BindAsync(object value, ValueBindingContext context)
{
// If we are not directly passed a DurableActivityContext, we can assume we are being called directly
// by the admin API. This is mainly used for the Azure Portal execution scenario.
if (!(value is DurableActivityContext activityContext))
{
if (!(value is string serializedInput))
{
throw new InvalidOperationException($"Cannot execute an Activity Trigger without a {nameof(DurableActivityContext)} or a {nameof(String)} that represents the serialized input.");
}
// Durable functions expects input as a JArray with one element.
serializedInput = $"[{serializedInput}]";
activityContext = new DurableActivityContext(this.durableTaskConfig, Guid.NewGuid().ToString(), serializedInput);
}
Type destinationType = this.parameterInfo.ParameterType;
object convertedValue;
if (destinationType == typeof(object))
{
convertedValue = value;
}
else if (destinationType == typeof(IDurableActivityContext))
{
convertedValue = activityContext;
}
else if (destinationType == typeof(JObject))
{
convertedValue = ActivityContextToJObject(activityContext);
}
else
{
convertedValue = activityContext.GetInput(destinationType);
}
var inputValueProvider = new ObjectValueProvider(
convertedValue,
this.parameterInfo.ParameterType);
// Note that there could be conflicts in thiese dictionary keys, in which case
// the order here determines which binding rule will win.
var bindingData = new Dictionary <string, object>(StringComparer.OrdinalIgnoreCase);
bindingData[InstanceIdBindingPropertyName] = ((IDurableActivityContext)activityContext).InstanceId;
bindingData[this.parameterInfo.Name] = convertedValue;
bindingData[DataBindingPropertyName] = activityContext.GetInputAsJson();
var triggerData = new TriggerData(inputValueProvider, bindingData);
triggerData.ReturnValueProvider = new ActivityTriggerReturnValueBinder(
activityContext,
this.parameterInfo.ParameterType);
return(Task.FromResult <ITriggerData>(triggerData));
}
private static JObject ActivityContextToJObject(DurableActivityContext arg)
{
JToken token = arg.GetInputAsJson();
if (token == null)
{
return(null);
}
JObject jObj = token as JObject;
if (jObj == null)
{
throw new ArgumentException($"Cannot convert '{token}' to a JSON object.");
}
return(jObj);
}