public async Task SaveTODOListAsync()
{
Console.WriteLine("----- Executing Save -----");
#region datamodel_construct_save
var list = new TODOList
{
User = "******",
ListId = "generated-list-id",
Complete = false,
Name = "ExampleList",
CreateDate = DateTime.UtcNow,
UpdateDate = DateTime.UtcNow,
Items = new List <TODOListItem>
{
new TODOListItem {
Description = "Task1", Complete = true
},
new TODOListItem {
Description = "Task2", Complete = false
}
}
};
await this.Context.SaveAsync(list);
Console.WriteLine("List saved");
#endregion
Console.WriteLine();
}
public static async Task SaveTODOListAsync()
{
var config = new DynamoDBContextConfig
{
Conversion = DynamoDBEntryConversion.V2,
ConsistentRead = true
};
var Context = new DynamoDBContext(new AmazonDynamoDBClient());
#region test_save_lambda_todo
var assignedEmail = "";
if (string.IsNullOrEmpty(assignedEmail))
{
Console.Error.WriteLine("You must set the email to the \"assignedEmail\" variable");
return;
}
var list = new TODOList
{
User = "******",
ListId = Guid.NewGuid().ToString(),
Complete = false,
Name = "ExampleList",
CreateDate = DateTime.UtcNow,
UpdateDate = DateTime.UtcNow,
Items = new List <TODOListItem>
{
new TODOListItem
{
Description = "Assigned Task",
Complete = false,
AssignedEmail = assignedEmail
}
}
};
await Context.SaveAsync(list);
Console.WriteLine("List saved, check your email to see if you get the assignment");
#endregion
}
public static async Task TestStreamAsync()
{
var config = new DynamoDBContextConfig
{
Conversion = DynamoDBEntryConversion.V2,
ConsistentRead = true
};
var Context = new DynamoDBContext(new AmazonDynamoDBClient());
#region test_stream_read
// Save list to table
var list = new TODOList
{
User = "******",
ListId = Guid.NewGuid().ToString(),
Complete = false,
Name = "StreamTest",
CreateDate = DateTime.UtcNow,
UpdateDate = DateTime.UtcNow,
Items = new List <TODOListItem>
{
new TODOListItem {
Description = "Task1", Complete = true
},
new TODOListItem {
Description = "Task2", Complete = false
}
}
};
await Context.SaveAsync(list);
using (var streamClient = new AmazonDynamoDBStreamsClient())
{
// Function for reading records continuously from a shard.
Func <string, CancellationToken, Task> shardReader = async(iterator, token) =>
{
while (!token.IsCancellationRequested)
{
var response = (await streamClient.GetRecordsAsync(new GetRecordsRequest {
ShardIterator = iterator
}));
// Update position in shard iterator
iterator = response.NextShardIterator;
// This is what you would write in a Lambda function processing DynamoDB Streams.
foreach (var record in response.Records)
{
var newVersion = record.Dynamodb.NewImage;
Console.WriteLine($"Item read: {newVersion["User"].S}/{newVersion["ListId"].S}");
}
}
};
// Find the arn for the DynamoDB Stream
var streamArn = (await streamClient.ListStreamsAsync(new ListStreamsRequest {
TableName = "TODOList"
}))
.Streams.FirstOrDefault()?.StreamArn;
Console.WriteLine($"The stream arn is {streamArn} shards");
// A stream is made of shards.
var shards = (await streamClient.DescribeStreamAsync(new DescribeStreamRequest {
StreamArn = streamArn
}))
.StreamDescription.Shards;
Console.WriteLine($"The stream currently has {shards.Count} shards");
// Execute a separate reader for each shard.
var cancelSource = new CancellationTokenSource();
var readerTasks = new Task[shards.Count];
for (int i = 0; i < readerTasks.Length; i++)
{
var shardIteratorRequest = new GetShardIteratorRequest
{
StreamArn = streamArn,
ShardId = shards[i].ShardId,
ShardIteratorType = ShardIteratorType.TRIM_HORIZON
};
var shardIterator = (await streamClient.GetShardIteratorAsync(shardIteratorRequest))
.ShardIterator;
Console.WriteLine($"Shard Iterator {i}: {shardIterator}");
readerTasks[i] = shardReader(shardIterator, cancelSource.Token);
}
Task.WaitAll(readerTasks, TimeSpan.FromSeconds(5));
cancelSource.Cancel();
}
#endregion
}