public async Task <MostPopularItems> GetMostPopularItems(string userId)
{
MostPopularItems results = null;
try
{
//USER_PERSONALIZATION -- userid required
var request = new GetRecommendationsRequest
{
CampaignArn = AwsParameterStoreClient.GetSimsMostPopularArn(), //sims-most-popular
UserId = userId,
NumResults = 10
};
var response = await AmazonPersonalizeRuntimeClient.GetRecommendationsAsync(request);
var recommendedItems = response.ItemList;
var json = JsonConvert.SerializeObject(recommendedItems);
Logger.LogInformation("GetMostPopularItems for userid:" + userId + ": " + json);
results = new MostPopularItems();
List <string> itemIds = recommendedItems.Select(s => s.ItemId).ToList();
results.Movies = await _storageService.GetMovieData(itemIds.ToArray());
return(results);
}
catch (Exception ex)
{
throw;
}
}
public async Task <ImdbMovieResponse> FindMovie(string imdbid)
{
var imdbMovieid = "tt" + imdbid;
ImdbMovieResponse imdbObj = null;
try
{
var apiKey = AwsParameterStoreClient.GetImdbApiKey();
var url = string.Format("http://www.omdbapi.com/?apikey={0}&i={1}", apiKey, imdbMovieid);
using (var result = await _httpClient.GetAsync(url))
{
string content = await result.Content.ReadAsStringAsync();
imdbObj = JsonConvert.DeserializeObject <ImdbMovieResponse>(content);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return(imdbObj);
}
public async Task <List <UserRating> > GetAllMoviesRatedByUser(string userId)
{
try
{
var query = string.Format("select * from S3Object s where s.USER_ID ='{0}' LIMIT 15", userId);
var response = await _client.SelectObjectContentAsync(new SelectObjectContentRequest
{
Bucket = AwsParameterStoreClient.GetS3BucketKey(),
Key = "ratings/ratings.csv",
ExpressionType = ExpressionType.SQL,
Expression = query,
InputSerialization = new InputSerialization
{
CSV = new CSVInput
{
FileHeaderInfo = FileHeaderInfo.Use,
FieldDelimiter = ","
}
},
OutputSerialization = new OutputSerialization
{
JSON = new JSONOutput()
}
});
var payload = response.Payload;
var result = "";
using (payload)
{
foreach (var ev in payload)
{
if (ev is RecordsEvent records)
{
using (var reader = new StreamReader(records.Payload, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
}
}
}
var umresult = result.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
var userResult = new List <UserRating>();
foreach (var o in umresult)
{
userResult.Add(JsonConvert.DeserializeObject <UserRating>(o));
}
return(userResult);
}
catch (Exception ex)
{
throw;
}
}
public async Task <Item> GetItemMovieData(string movieId)
{
try
{
var query = $"select * from S3Object s where s.item_Id ='{movieId}'";
var response = await _client.SelectObjectContentAsync(new SelectObjectContentRequest
{
Bucket = AwsParameterStoreClient.GetS3BucketKey(),
Key = "items/items.csv",
ExpressionType = ExpressionType.SQL,
Expression = query,
InputSerialization = new InputSerialization
{
CSV = new CSVInput
{
FileHeaderInfo = FileHeaderInfo.Use,
FieldDelimiter = ","
}
},
OutputSerialization = new OutputSerialization
{
JSON = new JSONOutput()
}
});
var payload = response.Payload;
var result = "";
using (payload)
{
foreach (var ev in payload)
{
if (ev is RecordsEvent records)
{
using (var reader = new StreamReader(records.Payload, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
}
}
}
var userResult = JsonConvert.DeserializeObject <Item>(result);
return(userResult);
}
catch (Exception ex)
{
throw;
}
}
public void AddEventTracker(string movieItemId, string userId)
{
try
{
//record events
var eventRequest = new PutEventsRequest
{
TrackingId =
AwsParameterStoreClient.GetClickStreamTrackingId(),
UserId = userId, //USER_ID
SessionId = Guid.NewGuid().ToString() //SESSION_ID
};
var ev1 = new TrackingEvent {
itemId = movieItemId
};
var ev = JsonConvert.SerializeObject(ev1);
var e = new Event
{
//e.EventId = "event1";
EventType = "click", //EVENT_TYPE
Properties = ev,
SentAt = DateTime.Now //TIMESTAMP
};
var events = new List <Event> {
e
};
eventRequest.EventList = events;
var amazonPersonalizeEventsClient = new AmazonPersonalizeEventsClient(RegionEndpoint.USEast1);
amazonPersonalizeEventsClient.PutEventsAsync(eventRequest);
Logger.LogInformation("Adding a clickstream event for userid:" + userId + ", movieitemid: " + movieItemId);
}
catch (Exception exception)
{
throw;
}
}
public async Task <PersonalizeViewModel> GetRecommendations(string userId)
{
PersonalizeViewModel results = null;
try
{
//USER_PERSONALIZATION -- userid required
var request = new GetRecommendationsRequest
{
CampaignArn = AwsParameterStoreClient.GetPersonalRecommendationsArn(), //personal-recommendations-metadata
UserId = userId,
NumResults = 10
};
var response = await AmazonPersonalizeRuntimeClient.GetRecommendationsAsync(request);
var recommendedItems = response.ItemList;
var json = JsonConvert.SerializeObject(recommendedItems);
Logger.LogInformation("GetRecommendations:" + userId + ": " + json);
results = new PersonalizeViewModel {
User = new User()
{
User_Id = userId
}
};
//get movie thumbnail from imdb
IList <RecommendedItems> recItems = new List <RecommendedItems>();
List <string> itemIds = recommendedItems.Select(s => s.ItemId).ToList();
results.RecommendedItems.Movies = await _storageService.GetMovieData(itemIds.ToArray());
return(results);
}
catch (Exception ex)
{
throw;
}
}
public async Task <SimilarItemViewModel> GetSimilarItems(string movieItemId)
{
SimilarItemViewModel results = null;
try
{
//RELATED_ITEMS -- itemId required
var relateditemsrequest = new GetRecommendationsRequest
{
CampaignArn = AwsParameterStoreClient.GetSimsArn(), //sims-arn
ItemId = movieItemId,
NumResults = 10
};
var relateditemsrequestresponse = await AmazonPersonalizeRuntimeClient.GetRecommendationsAsync(relateditemsrequest);
var relateditemsrequestrecommendedItems = relateditemsrequestresponse.ItemList;
var json = JsonConvert.SerializeObject(relateditemsrequestrecommendedItems);
Logger.LogInformation("GetSimilarItems for movie:" + movieItemId + ": " + json);
results = new SimilarItemViewModel
{
//selected movie
Movie = await _storageService.GetMovieData(movieItemId)
};
List <string> itemIds = relateditemsrequestrecommendedItems.Select(s => s.ItemId).ToList();
results.SimilarItems.Movies = await _storageService.GetMovieData(itemIds.ToArray());
return(results);
}
catch (Exception ex)
{
throw;
}
}
public async Task <PersonalizedRankingResults> GetPersonalizedResults(string userId, List <Movie> movies)
{
PersonalizedRankingResults results = null;
try
{
//USER_PERSONALIZATION -- userid required
var request = new GetPersonalizedRankingRequest //personal-ranking
{
CampaignArn =
AwsParameterStoreClient.GetPersonalRankingArn(),
UserId = userId,
InputList = movies.Select(s => s.Id).ToList()
};
var response = await AmazonPersonalizeRuntimeClient.GetPersonalizedRankingAsync(request);
var recommendedItems = response.PersonalizedRanking;
var json = JsonConvert.SerializeObject(recommendedItems);
Logger.LogInformation("GetPersonalizedResults:" + userId + ": " + json);
results = new PersonalizedRankingResults();
List <string> itemIds = recommendedItems.Select(s => s.ItemId).ToList();
results.Movies = await _storageService.GetMovieData(itemIds.ToArray());
return(results);
}
catch (Exception ex)
{
throw;
}
}
public async Task <List <Item> > GetItemMovieData(string[] movieIds)
{
try
{
string movieIds1 = string.Join(',', movieIds);
string rmovieIds = string.Join(",", movieIds1.Split(',').Select(x => string.Format("'{0}'", x)).ToList());
var query = $"select * from S3Object s where s.item_Id IN ({rmovieIds})";
var response = await _client.SelectObjectContentAsync(new SelectObjectContentRequest
{
Bucket = AwsParameterStoreClient.GetS3BucketKey(),
Key = "items/items.csv",
ExpressionType = ExpressionType.SQL,
Expression = query,
InputSerialization = new InputSerialization
{
CSV = new CSVInput
{
FileHeaderInfo = FileHeaderInfo.Use,
FieldDelimiter = ","
}
},
OutputSerialization = new OutputSerialization
{
JSON = new JSONOutput()
}
});
var payload = response.Payload;
List <Item> results = new List <Item>();
using (payload)
{
foreach (var ev in payload)
{
if (ev is RecordsEvent records)
{
using (var reader = new StreamReader(records.Payload, Encoding.UTF8))
{
string s = reader.ReadToEnd();
var jsonReader = new JsonTextReader(new StringReader(s))
{
SupportMultipleContent = true
};
var jsonSerializer = new JsonSerializer();
while (jsonReader.Read())
{
results.Add(jsonSerializer.Deserialize <Item>(jsonReader));
}
}
}
}
}
return(results);
}
catch (Exception ex)
{
throw;
}
}
