public async Task Reading_WithoutOffset_Throws()
{
var @ref = new LogRef("grargrgrgrgh");
await Should.ThrowAsync <LogException>(async() => {
await Client.AppendTo(@ref, "asdadadsad");
});
}
public async Task ReadingWithOffset_ReturnsFromOffsetOnwards()
{
await Redis.StringSetAsync("squeeak", "0123456789");
var @ref = new LogRef("squeeak", 5);
var result = await Client.ReadFrom(@ref);
result.Value.ShouldBe("56789");
result.Next.Offset.ShouldBe(10);
}
public async Task AppendingFails_WhenOffsetIsGazumped()
{
var @ref = new LogRef("squawk!", 0);
var result1 = await Client.AppendTo(@ref, "12345");
result1.Success.ShouldBeTrue();
var result2 = await Client.AppendTo(@ref, "9876");
result2.Success.ShouldBeFalse();
}
public async Task Client_Appends_ToExistingString()
{
await Redis.StringSetAsync("flap", "12345");
var @ref = new LogRef("flap", 5);
@ref = await Client.AppendTo(@ref, "6789").ExpectOK();
var val = (string)await Redis.StringGetAsync(@ref.Key);
val.ShouldBe("123456789");
}
public async Task Client_AppendsStrings()
{
var @ref = new LogRef("blah", 0);
@ref = await Client.AppendTo(@ref, "12345").ExpectOK();
@ref = await Client.AppendTo(@ref, "6789").ExpectOK();
var val = (string)await Redis.StringGetAsync(@ref.Key);
val.ShouldBe("123456789");
}
public async Task Client_Appends_AndReadsStrings()
{
var @ref = new LogRef("oof", 0);
@ref = await Client.AppendTo(@ref, "12345").ExpectOK();
@ref = await Client.AppendTo(@ref, "6789").ExpectOK();
var result = await Client.ReadFrom(@ref.WithoutOffset());
result.Success.ShouldBeTrue();
result.Value.ShouldBe("123456789");
}
public async Task OnlyOneAppenderCanWin_GivenCompetition()
{
var @ref = new LogRef("piffle", 0);
@ref = await Client.AppendTo(@ref, "abcdef").ExpectOK();
var results = await Enumerable.Range(0, 20)
.Map(async _ => {
await Task.Delay(10);
return(await Client.AppendTo(@ref, "ghij"));
})
.WhenAll();
results.Count(r => r.Success).ShouldBe(1);
}
public async Task Reading_WithoutOffset_ReturnsFullLog_AndOffsetToo()
{
var @ref = new LogRef("schnooo");
await Redis.StringSetAsync(@ref.Key, "12345678");
@ref = await Client.ReadFrom(@ref);
@ref.Offset.ShouldBe(8);
@ref = await Client.AppendTo(@ref, "9");
@ref.Offset.ShouldBe(9);
var result = (string)await Redis.StringGetAsync(@ref.Key);
result.ShouldBe("123456789");
}
internal ReadResult(bool success, T value, LogRef next)
{
Success = true;
Value = value;
Next = next;
}
internal AppendResult(bool success, LogRef next)
{
Success = success;
Next = next;
}
internal static ReadResult <T> Ok <T>(T value, LogRef next) => new ReadResult <T>(true, value, next);
internal static AppendResult Ok(LogRef next) => new AppendResult(true, next);