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fix issue with changelly rates and cover with UTs (#368)

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This commit is contained in:
Andrew Camilleri
2018-10-28 15:07:36 +01:00
committed by Nicolas Dorier
parent 254db22063
commit f51af6c61c
3 changed files with 53 additions and 16 deletions
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31
BTCPayServer.Tests/ChangellyTests.cs
View File

@@ -144,7 +144,6 @@ namespace BTCPayServer.Tests
await storesController.UpdateChangellySettings(user.StoreId, updateModel, "save")).ActionName);
Assert.IsNotType<BitpayErrorModel>(Assert
.IsType<OkObjectResult>(await changellyController.GetCurrencyList(user.StoreId))
.Value);
@@ -184,13 +183,13 @@ namespace BTCPayServer.Tests
var fetcher = new RateFetcher(factory);
var httpClientFactory = new MockHttpClientFactory();
var changellyController = new ChangellyController(
new ChangellyClientProvider(tester.PayTester.StoreRepository,httpClientFactory), tester.NetworkProvider, fetcher);
new ChangellyClientProvider(tester.PayTester.StoreRepository, httpClientFactory),
tester.NetworkProvider, fetcher);
changellyController.IsTest = true;
var result = Assert
.IsType<OkObjectResult>(await changellyController.GetCurrencyList(user.StoreId))
.Value as IEnumerable<CurrencyFull>;
Assert.True(result.Any());
}
}
@@ -215,13 +214,33 @@ namespace BTCPayServer.Tests
var fetcher = new RateFetcher(factory);
var httpClientFactory = new MockHttpClientFactory();
var changellyController = new ChangellyController(
new ChangellyClientProvider(tester.PayTester.StoreRepository,httpClientFactory), tester.NetworkProvider, fetcher);
new ChangellyClientProvider(tester.PayTester.StoreRepository, httpClientFactory),
tester.NetworkProvider, fetcher);
changellyController.IsTest = true;
Assert.IsType<decimal>(Assert
.IsType<OkObjectResult>(await changellyController.CalculateAmount(user.StoreId, "ltc", "btc", 1.0m)).Value);
.IsType<OkObjectResult>(await changellyController.CalculateAmount(user.StoreId, "ltc", "btc", 1.0m))
.Value);
}
}
[Fact]
[Trait("Integration", "Integration")]
public void CanComputeBaseAmount()
{
Assert.Equal(1, ChangellyCalculationHelper.ComputeBaseAmount(1, 1));
Assert.Equal(0.5m, ChangellyCalculationHelper.ComputeBaseAmount(1, 0.5m));
Assert.Equal(2, ChangellyCalculationHelper.ComputeBaseAmount(0.5m, 1));
Assert.Equal(4m, ChangellyCalculationHelper.ComputeBaseAmount(1, 4));
}
[Fact]
[Trait("Integration", "Integration")]
public void CanComputeCorrectAmount()
{
Assert.Equal(1, ChangellyCalculationHelper.ComputeCorrectAmount(0.5m, 1, 2));
Assert.Equal(0.25m, ChangellyCalculationHelper.ComputeCorrectAmount(0.5m, 1, 0.5m));
Assert.Equal(20, ChangellyCalculationHelper.ComputeCorrectAmount(10, 1, 2));
}
}
public class MockHttpClientFactory : IHttpClientFactory

16
BTCPayServer/Controllers/ChangellyController.cs
View File

@@ -61,8 +61,8 @@ namespace BTCPayServer.Controllers
}
var callCounter = 0;
var response1 = await client.GetExchangeAmount(fromCurrency, toCurrency, 1);
var currentAmount = response1;
var baseRate = await client.GetExchangeAmount(fromCurrency, toCurrency, 1);
var currentAmount = ChangellyCalculationHelper.ComputeBaseAmount(baseRate, toCurrencyAmount);
while (true)
{
if (callCounter > 10)
@@ -70,13 +70,13 @@ namespace BTCPayServer.Controllers
BadRequest();
}
var response2 = await client.GetExchangeAmount(fromCurrency, toCurrency, currentAmount);
var computedAmount = await client.GetExchangeAmount(fromCurrency, toCurrency, currentAmount);
callCounter++;
if (response2 < toCurrencyAmount)
if (computedAmount < toCurrencyAmount)
{
var newCurrentAmount = ((toCurrencyAmount / response2) * 1m) * currentAmount;
currentAmount = newCurrentAmount;
currentAmount =
ChangellyCalculationHelper.ComputeCorrectAmount(currentAmount, computedAmount,
toCurrencyAmount);
}
else
{
@@ -114,4 +114,6 @@ namespace BTCPayServer.Controllers
public bool IsTest { get; set; } = false;
}
}

16
BTCPayServer/Payments/Changelly/ChangellyCalculationHelper.cs Normal file
View File

@@ -0,0 +1,16 @@
namespace BTCPayServer.Payments.Changelly
{
public static class ChangellyCalculationHelper
{
public static decimal ComputeBaseAmount(decimal baseRate, decimal toAmount)
{
return (1m / baseRate) * toAmount;
}
public static decimal ComputeCorrectAmount(decimal currentFromAmount, decimal currentAmount,
decimal expectedAmount)
{
return (currentFromAmount / currentAmount) * expectedAmount;
}
}
}