public async Task Will_Retry_Up_To_Retry_Limit_And_Pause_Between_Each_Attempt()
{
const int MaxRetries = 3;
const int ExpectedAttempts = MaxRetries + 1;
var blockProcessingException = new RpcClientTimeoutException("fake exception");
int timesThrown = 0;
MockProcessingStrategy
.SetupGet(s => s.MaxRetries).Returns(MaxRetries);
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(0))
.Callback <long>((blkNum) => timesThrown++)
.Throws(blockProcessingException);
for (var retryNum = 0; retryNum < MaxRetries; retryNum++)
{
MockProcessingStrategy
.Setup(s => s.PauseFollowingAnError(retryNum))
.Returns(Task.CompletedTask);
}
await Processor.ExecuteAsync(0, 0);
Assert.Equal(ExpectedAttempts, timesThrown);
MockProcessingStrategy.VerifyAll();
}
Will_Process_The_Requested_Block_Range()
{
const long StartBlock = 1000;
const long EndBlock = 1205;
for (var block = StartBlock; block <= EndBlock; block++)
{
MockBlockProcessor.Setup(p => p.ProcessBlockAsync(block)).Returns(Task.CompletedTask);
}
Assert.True(await Processor.ExecuteAsync(StartBlock, EndBlock));
MockBlockProcessor.VerifyAll();
}
Requests_Last_Block_Processed_From_Strategy_And_Uses_The_Previous_Block_Number()
{
const long LastBlockProcessed = 11;
const long ExpectedStartBlock = LastBlockProcessed - 1;
const long EndingBlock = ExpectedStartBlock;
MockProcessingStrategy
.Setup(s => s.GetLastBlockProcessedAsync())
.ReturnsAsync(LastBlockProcessed);
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(ExpectedStartBlock))
.Returns(Task.CompletedTask);
await Processor.ExecuteAsync(startBlock : null, endBlock : EndingBlock);
MockProcessingStrategy.VerifyAll();
MockBlockProcessor.VerifyAll();
}
public async Task Will_Wait_For_Minimum_Block_Confirmations()
{
const int RequiredBlockConfirmations = 6;
long maxBlockNumber = 0;
int numberOfWaitCycles = 0;
int blocksProcessed = 0;
var cancellationTokenSource = new CancellationTokenSource();
MockProcessingStrategy
.Setup(s => s.MinimumBlockConfirmations)
.Returns(RequiredBlockConfirmations);
MockBlockProcessor
.Setup(p => p.GetMaxBlockNumberAsync())
.Callback(() => maxBlockNumber++)
.ReturnsAsync(() => maxBlockNumber);
MockProcessingStrategy
.Setup(s => s.WaitForNextBlock(It.IsAny <int>()))
.Callback <int>((retryNumber) => numberOfWaitCycles++)
.Returns(Task.CompletedTask);
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(0))
.Returns(() =>
{
blocksProcessed++;
cancellationTokenSource.Cancel();
return(Task.CompletedTask);
});
var result = await Processor.ExecuteAsync(startBlock : 0, endBlock : null, cancellationToken : cancellationTokenSource.Token);
Assert.False(result, "Result should be false because execution should have been stopped by cancellation token");
Assert.Equal(1, blocksProcessed);
Assert.Equal(RequiredBlockConfirmations - 1, numberOfWaitCycles);
Assert.Equal(RequiredBlockConfirmations, maxBlockNumber);
MockBlockProcessor.VerifyAll();
MockProcessingStrategy.VerifyAll();
}
public async Task Last_Block_Processsed_Is_Only_Used_If_Greater_Than_Minimum_Block_Number()
{
const long LastBlockProcessed = 11;
const long MinimumStartingBlock = 20;
const long EndingBlock = MinimumStartingBlock;
MockProcessingStrategy.SetupGet(s => s.MinimumBlockNumber).Returns(MinimumStartingBlock);
MockProcessingStrategy
.Setup(s => s.GetLastBlockProcessedAsync())
.ReturnsAsync(LastBlockProcessed);
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(MinimumStartingBlock))
.Returns(Task.CompletedTask);
await Processor.ExecuteAsync(startBlock : null, endBlock : EndingBlock);
MockProcessingStrategy.VerifyAll();
MockBlockProcessor.VerifyAll();
}
public async Task Will_Wait_For_Minimum_Block_Confirmations()
{
const int RequiredBlockConfirmations = 6;
long maxBlockNumber = 0;
int numberOfWaitCycles = 0;
int blocksProcessed = 0;
MockProcessingStrategy
.Setup(s => s.MinimumBlockConfirmations)
.Returns(RequiredBlockConfirmations);
MockBlockProcessor
.Setup(p => p.GetMaxBlockNumberAsync())
.Callback(() => maxBlockNumber++)
.ReturnsAsync(() => maxBlockNumber);
MockProcessingStrategy
.Setup(s => s.WaitForNextBlock(It.IsAny <int>()))
.Callback <int>((retryNumber) => numberOfWaitCycles++)
.Returns(Task.CompletedTask);
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(0))
.Returns(() =>
{
blocksProcessed++;
return(Task.CompletedTask);
});
var result = await Processor.ExecuteAsync(startBlock : 0, endBlock : 0);
Assert.True(result);
Assert.Equal(1, blocksProcessed);
Assert.Equal(RequiredBlockConfirmations - 1, numberOfWaitCycles);
Assert.Equal(RequiredBlockConfirmations, maxBlockNumber);
MockBlockProcessor.VerifyAll();
MockProcessingStrategy.VerifyAll();
}
Will_Run_Continuously()
{
var cancellationTokenSource = new CancellationTokenSource();
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(0))
.Returns(Task.CompletedTask)
.Verifiable("ProcessBlockAsync should have been called for Block 0");
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(1))
.Callback <long>(blkNum => cancellationTokenSource.Cancel())
.Returns(Task.CompletedTask)
.Verifiable("ProcessBlockAsync should have been called for Block 1");
var result = await Processor.ExecuteAsync(startBlock : 0, endBlock : null, cancellationToken : cancellationTokenSource.Token);
Assert.False(result,
"Result should be false because execution was cancelled by cancellation token source after block number 1");
MockBlockProcessor.VerifyAll();
}
public async Task When_A_Block_Is_Not_Found_Will_Ask_Strategy_To_Wait_For_Next_Block_Until_Cancelled()
{
var cancellationTokenSource = new CancellationTokenSource();
MockBlockProcessor
.Setup(p => p.ProcessBlockAsync(0))
.Throws(new BlockNotFoundException(0));
MockProcessingStrategy.Setup(s => s.WaitForNextBlock(0)).Returns(Task.CompletedTask);
MockProcessingStrategy.Setup(s => s.WaitForNextBlock(1)).Returns(Task.CompletedTask);
MockProcessingStrategy.Setup(s => s.WaitForNextBlock(2)).Returns(() =>
{
cancellationTokenSource.Cancel();
return(Task.CompletedTask);
});
var result = await Processor.ExecuteAsync(startBlock : 0, endBlock : null, cancellationToken : cancellationTokenSource.Token);
Assert.False(result,
"Result should be false because execution was cancelled by cancellation token source");
MockBlockProcessor.VerifyAll();
MockProcessingStrategy.VerifyAll();
}