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NatsHeaderTest.cs
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NatsHeaderTest.cs
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using System.Buffers;
using System.IO.Pipelines;
using System.Text;
namespace NATS.Client.Core.Tests;
public class NatsHeaderTest
{
private readonly ITestOutputHelper _output;
public NatsHeaderTest(ITestOutputHelper output) => _output = output;
[Fact]
public async Task WriterTests()
{
var headers = new NatsHeaders
{
["k1"] = "v1",
["k2"] = new[] { "v2-0", "v2-1" },
["a-long-header-key"] = "value",
["key"] = "a-long-header-value",
};
var pipe = new Pipe(new PipeOptions(pauseWriterThreshold: 0));
var writer = new HeaderWriter(Encoding.UTF8);
var written = writer.Write(pipe.Writer, headers);
var text = "NATS/1.0\r\nk1: v1\r\nk2: v2-0\r\nk2: v2-1\r\na-long-header-key: value\r\nkey: a-long-header-value\r\n\r\n";
var expected = new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text));
Assert.Equal(expected.Length, written);
await pipe.Writer.FlushAsync();
var result = await pipe.Reader.ReadAtLeastAsync((int)written);
Assert.True(expected.ToSpan().SequenceEqual(result.Buffer.ToSpan()));
_output.WriteLine($"Buffer:\n{result.Buffer.FirstSpan.Dump()}");
}
[Fact]
public async Task WriterEmptyTests()
{
var headers = new NatsHeaders();
var pipe = new Pipe(new PipeOptions(pauseWriterThreshold: 0));
var writer = new HeaderWriter(Encoding.UTF8);
var written = writer.Write(pipe.Writer, headers);
var text = "NATS/1.0\r\n\r\n";
var expected = new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text));
Assert.Equal(expected.Length, written);
await pipe.Writer.FlushAsync();
var result = await pipe.Reader.ReadAtLeastAsync((int)written);
Assert.True(expected.ToSpan().SequenceEqual(result.Buffer.ToSpan()));
_output.WriteLine($"Buffer:\n{result.Buffer.FirstSpan.Dump()}");
}
[Fact]
public void ParserTests()
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var text = "NATS/1.0 123 Test Message\r\nk1: v1\r\nk2: v2-0\r\nk2: v2-1\r\na-long-header-key: value\r\nkey: a-long-header-value\r\n\r\n";
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
_output.WriteLine($"Headers:\n{headers.Dump()}");
Assert.Equal(1, headers.Version);
Assert.Equal(123, headers.Code);
Assert.Equal("Test Message", headers.MessageText);
Assert.Equal(4, headers.Count);
Assert.True(headers.ContainsKey("k1"));
Assert.Single(headers["k1"].ToArray());
Assert.Equal("v1", headers["k1"]);
Assert.True(headers.ContainsKey("k2"));
Assert.Equal(2, headers["k2"].ToArray().Length);
Assert.Equal("v2-0", headers["k2"][0]);
Assert.Equal("v2-1", headers["k2"][1]);
Assert.True(headers.ContainsKey("a-long-header-key"));
Assert.Single(headers["a-long-header-key"].ToArray());
Assert.Equal("value", headers["a-long-header-key"]);
Assert.True(headers.ContainsKey("key"));
Assert.Single(headers["key"].ToArray());
Assert.Equal("a-long-header-value", headers["key"]);
}
[Theory]
[InlineData("Idle Heartbeat", NatsHeaders.Messages.IdleHeartbeat)]
[InlineData("Bad Request", NatsHeaders.Messages.BadRequest)]
[InlineData("Consumer Deleted", NatsHeaders.Messages.ConsumerDeleted)]
[InlineData("Consumer is push based", NatsHeaders.Messages.ConsumerIsPushBased)]
[InlineData("No Messages", NatsHeaders.Messages.NoMessages)]
[InlineData("Request Timeout", NatsHeaders.Messages.RequestTimeout)]
[InlineData("Message Size Exceeds MaxBytes", NatsHeaders.Messages.MessageSizeExceedsMaxBytes)]
[InlineData("test message", NatsHeaders.Messages.Text)]
public void ParserMessageEnumTests(string message, NatsHeaders.Messages result)
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var text = $"NATS/1.0 100 {message}\r\n\r\n";
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
Assert.Equal(result, headers.Message);
Assert.Equal(message, headers.MessageText);
}
[Fact]
public void ParserVersionErrorTests()
{
var exception = Assert.Throws<NatsException>(() =>
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var text = "NATS/2.0\r\n\r\n";
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
});
Assert.Equal("Protocol error: header version mismatch", exception.Message);
}
[Fact]
public void ParserCodeErrorTests()
{
var exception = Assert.Throws<NatsException>(() =>
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var text = "NATS/1.0 x\r\n\r\n";
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
});
Assert.Equal("Protocol error: header code is not a number", exception.Message);
}
[Theory]
[InlineData("NATS/1.0\r\n\r\n", 0, "", 0)]
[InlineData("NATS/1.0\r\nk:v\r\n\r\n", 0, "", 1)]
[InlineData("NATS/1.0 42\r\n\r\n", 42, "", 0)]
[InlineData("NATS/1.0 42\r\nk:v\r\n\r\n", 42, "", 1)]
[InlineData("NATS/1.0 123 test\r\nk:v\r\n\r\n", 123, "test", 1)]
[InlineData("NATS/1.0 123 test\r\n\r\n", 123, "test", 0)]
[InlineData("NATS/1.0 456 test 2\r\n\r\n", 456, "test 2", 0)]
[InlineData("NATS/1.0 123456 test test 3\r\n\r\n", 123456, "test test 3", 0)]
[InlineData("NATS/1.0 123456 test test 3\r\nk:v\r\n\r\n", 123456, "test test 3", 1)]
public void ParserHeaderVersionOnlyTests(string text, int code, string message, int headerCount)
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
Assert.Equal(1, headers.Version);
Assert.Equal(code, headers.Code);
Assert.Equal(NatsHeaders.Messages.Text, headers.Message);
Assert.Equal(message, headers.MessageText);
Assert.Equal(headerCount, headers.Count);
}
[Fact]
public void ParserMultiSpanTests()
{
const string text1 = "NATS/1.0 123 Test ";
const string text2 = "Message\r\n\r\n";
var parser = new NatsHeaderParser(Encoding.UTF8);
var builder = new SeqeunceBuilder();
builder.Append(Encoding.UTF8.GetBytes(text1));
builder.Append(Encoding.UTF8.GetBytes(text2));
var input = new SequenceReader<byte>(builder.ToReadOnlySequence());
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
Assert.Equal(1, headers.Version);
Assert.Equal(123, headers.Code);
Assert.Equal("Test Message", headers.MessageText);
}
[Theory]
[InlineData("NATS/1.0 123 Test Message\r\nk2: v2-0\r\nk2: v2-1\r\n\r\n", true, "v2-1")]
[InlineData("NATS/1.0 123 Test Message\r\nk2: v2-0\r\n\r\n", true, "v2-0")]
[InlineData("NATS/1.0 123 Test Message\r\nk3: v2-0\r\n\r\n", false, null)]
[InlineData("NATS/1.0 123 Test Message\r\n\r\n", false, null)]
public void GetLastValueTests(string text, bool expectedResult, string? expectedLastValue)
{
var parser = new NatsHeaderParser(Encoding.UTF8);
var input = new SequenceReader<byte>(new ReadOnlySequence<byte>(Encoding.UTF8.GetBytes(text)));
var headers = new NatsHeaders();
parser.ParseHeaders(input, headers);
var result = headers.TryGetLastValue("k2", out var lastValue);
Assert.Equal(result, expectedResult);
Assert.Equal(lastValue, expectedLastValue);
}
}