public async Task ReadsPipeUntilEnoughtData()
{
// Arrange
var request = new ReadHoldingRegistersRequest(1, 1, 1);
var response = new byte[] { 0, 1, 0, 0, 0, 5, 1, 3, 2, 0, 0 };
var responseSequence = new ReadOnlySequence <byte>(response.AsMemory(0, 11));
var pipeAdapterMock = new Mock <IPipeResource>();
pipeAdapterMock.Setup(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>())).Returns(Task.CompletedTask);
pipeAdapterMock.SetupSequence(x => x.ReadAsync(It.IsAny <CancellationToken>()))
.ReturnsAsync(new ReadOnlySequence <byte>(response.AsMemory(0, 1)))
.ReturnsAsync(new ReadOnlySequence <byte>(response.AsMemory(0, 3)))
.ReturnsAsync(new ReadOnlySequence <byte>(response.AsMemory(0, 5)))
.ReturnsAsync(new ReadOnlySequence <byte>(response.AsMemory(0, 7)))
.ReturnsAsync(new ReadOnlySequence <byte>(response.AsMemory(0, 9)))
.ReturnsAsync(responseSequence);
var transactionIdProviderMock = new Mock <ITransactionIdProvider>();
transactionIdProviderMock.Setup(x => x.NewId()).Returns(1);
var target = new ModbusIpTransport(pipeAdapterMock.Object, Mock.Of <IModbusLogger>(), transactionIdProviderMock.Object);
// Act
var actual = await target.SendAsync <ReadHoldingRegistersResponse>(request, It.IsAny <CancellationToken>());
// Assert
pipeAdapterMock.Verify(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>()), Times.Once());
pipeAdapterMock.Verify(x => x.ReadAsync(It.IsAny <CancellationToken>()), Times.Exactly(6));
pipeAdapterMock.Verify(x => x.AdvanceTo(responseSequence.Start), Times.Exactly(5));
pipeAdapterMock.Verify(x => x.AdvanceTo(responseSequence.End), Times.Once());
}
public async Task ThrowsOnOldTransactionIfRetryCountExceeded()
{
// Arrange
var request = new ReadHoldingRegistersRequest(1, 1, 1);
var oldResponse = new ReadOnlySequence <byte>(new byte[] { 0, 1, 0, 0, 0, 5, 1, 3, 2, 0, 0 }.AsMemory());
var newResponse = new ReadOnlySequence <byte>(new byte[] { 0, 2, 0, 0, 0, 5, 1, 3, 2, 0, 0 }.AsMemory());
var pipeAdapterMock = new Mock <IPipeResource>();
pipeAdapterMock.Setup(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>())).Returns(Task.CompletedTask);
pipeAdapterMock.SetupSequence(x => x.ReadAsync(It.IsAny <CancellationToken>()))
.ReturnsAsync(oldResponse)
.ReturnsAsync(oldResponse)
.ReturnsAsync(oldResponse)
.ReturnsAsync(newResponse);
var transactionIdProviderMock = new Mock <ITransactionIdProvider>();
transactionIdProviderMock.Setup(x => x.NewId()).Returns(2);
var target = new ModbusIpTransport(pipeAdapterMock.Object, Mock.Of <IModbusLogger>(), transactionIdProviderMock.Object)
{
Retries = 2
};
// Act
await Assert.ThrowsAsync <IOException>(() => target.SendAsync <ReadHoldingRegistersResponse>(request));
// Assert
pipeAdapterMock.Verify(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>()), Times.Exactly(3));
pipeAdapterMock.Verify(x => x.ReadAsync(It.IsAny <CancellationToken>()), Times.Exactly(3));
}
public async Task RetriesOnOldTransactionIfDifferenceIsAboveThreshold()
{
// Arrange
var request = new ReadHoldingRegistersRequest(1, 1, 1);
var oldResponse = new ReadOnlySequence <byte>(new byte[] { 0, 3, 0, 0, 0, 5, 1, 3, 2, 0, 0 }.AsMemory());
var newResponse = new ReadOnlySequence <byte>(new byte[] { 0, 5, 0, 0, 0, 5, 1, 3, 2, 0, 0 }.AsMemory());
var pipeAdapterMock = new Mock <IPipeResource>();
pipeAdapterMock.Setup(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>())).Returns(Task.CompletedTask);
pipeAdapterMock.SetupSequence(x => x.ReadAsync(It.IsAny <CancellationToken>()))
.ReturnsAsync(oldResponse)
.ReturnsAsync(newResponse);
var transactionIdProviderMock = new Mock <ITransactionIdProvider>();
transactionIdProviderMock.Setup(x => x.NewId()).Returns(5);
var target = new ModbusIpTransport(pipeAdapterMock.Object, Mock.Of <IModbusLogger>(), transactionIdProviderMock.Object)
{
Retries = 0,
RetryOnOldResponseThreshold = 3
};
// Act
var actual = await target.SendAsync <ReadHoldingRegistersResponse>(request);
// Assert
pipeAdapterMock.Verify(x => x.WriteAsync(It.IsAny <ReadOnlyMemory <byte> >(), It.IsAny <CancellationToken>()), Times.Once());
pipeAdapterMock.Verify(x => x.ReadAsync(It.IsAny <CancellationToken>()), Times.Exactly(2));
}
