/// <summary>
/// Unmarshaller the response from the service to the response class.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
{
BatchDetectSentimentResponse response = new BatchDetectSentimentResponse();
context.Read();
int targetDepth = context.CurrentDepth;
while (context.ReadAtDepth(targetDepth))
{
if (context.TestExpression("ErrorList", targetDepth))
{
var unmarshaller = new ListUnmarshaller <BatchItemError, BatchItemErrorUnmarshaller>(BatchItemErrorUnmarshaller.Instance);
response.ErrorList = unmarshaller.Unmarshall(context);
continue;
}
if (context.TestExpression("ResultList", targetDepth))
{
var unmarshaller = new ListUnmarshaller <BatchDetectSentimentItemResult, BatchDetectSentimentItemResultUnmarshaller>(BatchDetectSentimentItemResultUnmarshaller.Instance);
response.ResultList = unmarshaller.Unmarshall(context);
continue;
}
}
return(response);
}
public async Task FunctionHandler(DynamoDBEvent dynamoEvent, ILambdaContext context)
{
context.Logger.LogLine($"Beginning to process {dynamoEvent.Records.Count} records...");
List <SentimentAnalysis> analysis = dynamoEvent.Records
.Select(record =>
{
context.Logger.LogLine($"Event ID: {record.EventID}");
context.Logger.LogLine($"Event Name: {record.EventName}");
return(new SentimentAnalysis(record.Dynamodb));
})
.ToList();
BatchDetectSentimentResponse response = await _comprehendClient.BatchDetectSentimentAsync(new BatchDetectSentimentRequest
{
TextList = analysis.Select(s => s.Data).ToList(),
LanguageCode = "en"
});
analysis = Enumerable.Zip(analysis, response.ResultList, (a, b) =>
{
a.Sentiment = b.Sentiment;
return(a);
})
.ToList();
foreach (var a in analysis)
{
ManualOverride(a);
}
var badDays = analysis.Where(x => x.Sentiment == SentimentType.NEGATIVE);
badDays.ToList();
context.Logger.LogLine(String.Join(' ', analysis.Select(a => a.ToString())));
var publishTasks = badDays.Select(a =>
_snsClient.PublishAsync(new PublishRequest("arn:aws:sns:eu-west-1:875034483274:intervention-required", a.Data)
{
MessageAttributes = new Dictionary <string, MessageAttributeValue> {
{ "UserId", new MessageAttributeValue {
DataType = "String", StringValue = a.UserId
} },
{ "Type", new MessageAttributeValue {
DataType = "String", StringValue = a.Type
} },
{ "Level", new MessageAttributeValue {
DataType = "String", StringValue = a.SentimentLevel
} }
}
}));
var responses = await Task.WhenAll(publishTasks);
context.Logger.Log(String.Join(' ', responses.Select(r => JsonConvert.SerializeObject(r))));
context.Logger.LogLine("Stream processing complete.");
}
