QAToolKit.Engine.Probes is a .NET Standard 2.1 library that contains network probes to test servers/services with protocols like HTTP, TCP, ICMP (Ping).
When you have a complex software system and would like to check its liveness or read some statuses, you can use the QAToolKit Probes library.
You can quickly write tests or protocols to send PING, send TCP messages, or hit an HTTP endpoint.
Then get the results and process them further depending on your needs.
Supported .NET frameworks and standards: netstandard2.0, netstandard2.1, net7.0
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A Ping Probe is an ICMP echo request that checks if a particular host is "alive" or that it can return the echo to us.
From Wikipedia: Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP echo reply.
You can use it to check if a host is up or down, but not much more. It can be used as a first in line test since it's the fastest.
To create a Ping probe, you can easily do it like this:
PingProbe pinger = new PingProbe("google.com");
PingResult result = await pinger.Execute();
logger.LogInformation($"Success: {result.Success}");
logger.LogInformation($"ReplyAddress: {result.ReplyAddress}");
logger.LogInformation($"Time: {result.RoundTripTime}");
logger.LogInformation($"TTL: {result.Ttl}");
logger.LogInformation($"BufferLength: {result.BufferLength}");PingProbe generates a PingResult which contains a lot of useful information.
A TCP Probe can do much more than a Ping Probe. If you have an IoT or any other service listening for TCP connections on a specific port, this is a probe for you. You can easily send an array of messages or commands to a TCP address and get the responses.
To create a TCP Probe, you can easily do it like this:
TcpProbe tcpProbe = new TcpProbe("tcpbin.com", 4242, new[] { "HELO\n" });
TcpResult result = await tcpProbe.Execute();
logger.LogInformation($"ResponseData: {result.ResponseData}");We connect to the tcpbin.com:4242 and send a message HELO + newline character - "Helo\n".
Since this is an ECHO service, we will get back what we sent - "Helo\n". You can read the reply message from the TcpResult.ResponseData property.
An HTTP Probe creates a simple HTTP request to your specified URL address. Only two parameters are necessary to make an HTTP Probe; Url and HttpMethod.
It would be best to use HTTP probes for simple HTTP requests; that's why you can not specify and authenticate or JSON payloads. Here are some examples:
- test if a website index page returns OK - 200
- test a health check API endpoint returns OK - 200
- test that an Azure storage file is not visible and returns Forbidden - 403
If you want to do comprehensive HTTP service tests, please use QAToolKit HttpTester Library.
To create a HTTP Probe, you can easily do it like this:
HttpProbe httpProbe = new HttpProbe(
new Uri("https://swagger-demo.qatoolkit.io/swagger/index.html"),
HttpMethod.Get);
HttpResult result = await httpProbe.Execute();
logger.LogInformation($"StatusCode: {result.StatusCode}");
logger.LogInformation($"ResponseBody: {result.ResponseBody}");In the example above, we connect to the https://swagger-demo.qatoolkit.io/swagger/index.html by making a GET request. We wait for the response and can extract the StatusCode and ResponseBody from it.
If you want to follow the QAToolKit convention, you can create your probe by implementing IProbe<T> interface.
Below we create a MyProbe that implements IProbe<string> with single method Execute().
public class MyProbe : IProbe<string>
{
public Task<string> Execute()
{
....
}
}- This library is an early alpha version
- Support for more probes (UDP,...).
MIT License
Copyright (c) 2020-2023 Miha Jakovac
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