SmolFennec.SpeCLI 1.2.0

SmolFennec.SpeCLI

SmolFennec is a collective name for small libraries and tools released by Levi licensed under MIT and hosted on github. SpeCLI provides a way to describe CLI behaviour of external processes.

<img src="https://raw.githubusercontent.com/Levi--G/SmolFennec.SpeCLI/master/SpeCLI/SmolFennec.png" width="300" height="300">

Support

Supported platforms: .Net Standard 2.0+

When in trouble: Submit an issue

Usage

EZ mode:

(The ping command was used below for short instructional purposes, ofcourse it is not meant to be used like this, use the ping class instead!)

Create a class for input and a class for output. Usable attributes:

• Parameter: Defines a parameter with name and value, like: -n 50
• Switch: Defines a switch with name only, like: -6
• HideName: Defines a parameter with value only, like: Hostname
• When nothing is supplied a parameter with the property name and a value is created

class PingArguments
{
    [Switch("t")]
    public bool Continuous { get; set; }
    [Parameter("n")]
    public int? Count { get; set; }
    [Parameter("i")]
    public int? TTL { get; set; }
    [Parameter("w")]
    public int? Timeout { get; set; }
    [Switch("4")]
    public bool IPV4 { get; set; }
    [Switch("6")]
    public bool IPV6 { get; set; }
    [HideName]
    public string Host { get; set; }
}

class PingResult
{
    public string ip { get; set; }
    public string fail { get; set; }
    public bool Success => !string.IsNullOrEmpty(ip) && string.IsNullOrEmpty(fail);
    public int bytes { get; set; }
    public TimeSpan time { get; set; }
    public int ttl { get; set; }
}

Create an Executable with Commands Usable OutputProcessors at this time:

• JsonOutputProcessor: Parses the outputted lines as json
• RegexCaptureOutputProcessor: Populates an object with matched regex groups
• RegexSplitOutputProcessor: Splits the lines matching regexes over different OutputProcessors
• CloneOutputProcessor: Clones the output and sends it to other OutputProcessors
• Interface to write your own!

For the individual configuration please look at the configuration properties and methods.

 // The regex we will use later
const string regex = @"Reply from (?<ip>[^:]+): (?:bytes=(?<bytes>\d+) time[^\d]*(?<time>[^ ]+) TTL=(?<ttl>\d+)|(?<fail>.+))";
 // Create an executable to hold commands to be reused
var exe = new Executable("ping");
 // Add a new command
exe.Add("ping")
     // Add all parameters from this type
    .AddParametersFromType(typeof(PingArguments))
    .WithProcessor(
         // Use this processor to handle regex output
        new RegexCaptureOutputProcessor()
         // Map this regex to the output type we made, this can be done multiple times
        .AddRegex<PingResult>(new Regex(regex))
         // Add a manual mapping for the non-standard timespan conversion
        .AddPropertyMapping(s => TimeSpan.FromMilliseconds(int.Parse(s.TrimEnd('m', 's'))))
     );

Use the constructed Executable:

List<PingResult> matches = exe.ExecuteCommandAndParseList<PingResult>("ping", new PingArguments() {
    Count = 8,
    Host = "Hostname",
    Timeout = 50
});

Full sample can be found in the source.

Manual/Advanced mode:

IAsyncEnumerables can be obtained like this:

var iae = exe.ExecuteCommandAndParseIAsyncEnumerable<PingResult>("ping", new PingArguments() { Host = "Hostname" });

Parameters can also be declared manually. When invoking a nameless type, a Dictionary<string, object> or another type with similar properties can also be used. When you specify a List<object> any objects generated from whatever type will be returned

exe.Add("ping")
    .AddParameter<int?>("n")
    .AddParameter(new Parameter<string>("host").WithHideName());
    .AddParameter(new Switch("6"))

var objs = exe.ExecuteCommandAndParseList<object>("ping", new { Host = "Hostname" });

An Execution object can also be obtained, altho short-lived (pun intended) these can allow more low-level access to the process, events and Stdin.

var exec = exe.CreateExecution("ping", new PingArguments() { Host = "Hostname" });
exec.OutputDataReceived += (s, e) => { }; // raw stdout
exec.ErrorDataReceived += (s, e) => { }; // raw stderr
exec.OnOutput += (s, e) => { }; // Parsed objects
exec.OnError += (s, e) => { }; // Exceptions during parsing
exec.Start(); // Needs to be started manually;
exec.SendInputLine("Hello World!"); // Can send stdin

SmolFennec.SpeCLI.Proxy

Usage

Define Arguments and results exactly like normal SpeCLI configuration. Create a Executable class:

• Enter path to executable or the command in the Executable attribute
• Inherit from IExecutable to add an OnConfiguring method to apply further configuration during proxy generation
• Add any OutputProcessors in the OnConfiguring method

[Executable("ping")]
public abstract class Ping : IExecutable
{
    public void OnConfiguring(Executable executable)
    {
        var processor = new RegexCaptureOutputProcessor()
            .AddRegex<PingResult>(new Regex(@"Reply from (?<ip>[^:]+): (?:bytes=(?<bytes>\d+) time[^\d]*(?<time>[^ ]+) TTL=(?<ttl>\d+)|(?<fail>.+))"))
            .AddPropertyMapping((string s) => !string.IsNullOrEmpty(s) ? TimeSpan.FromMilliseconds(int.Parse(s.TrimEnd('m', 's'))) : (TimeSpan?)null);
        foreach (var command in executable.Commands)
        {
            command.Processor = processor;
        }
    }
}

Configure commands in these steps:

• Add Command attribute to a public abstract method with or without custom name
• Add a supported return type: any object supported by selected OutputProcessors or a List<> or IAsyncEnumerable<> of that object, or an Execution object
• Add arguments for your parameters:
  • a single defined object containing parameter attributes (like ping/PingArguments)
  • a set of parameters with their attributes (like ping2)
  • an object or Dictionary<string, object> ⇒ need to add parameter attributes to the method (like ping3/4)
• Adding parameters can be done on the method and defaults can be assigned without adding them as parameter if you want to make a specific method for a certain CLI option (like SinglePing)

Examples:

[Command("ping1")]
public abstract List<PingResult> ping(PingArguments arguments);
[Command]
public abstract List<PingResult> ping2([Switch("t")] bool Continuous, [Parameter("n")] int? Count, [Parameter("w")] int? Timeout, [HideName] string Host);
[Command]
[Parameter("n")]
[Parameter("Host", HideName = true)]
[Parameter("w")]
public abstract List<PingResult> ping3(object arguments);
[Command]
[Parameter("n")]
[Parameter("Host", HideName = true)]
[Parameter("w")]
public abstract List<PingResult> ping4(Dictionary<string, object> arguments);
[Command]
[Parameter("n", typeof(int?), 1)]
public abstract PingResult SinglePing([HideName] string Host, [Parameter("w")] int? Timeout = null);
[Command]
[Parameter("n", typeof(int?), 1)]
public abstract Execution SinglePingExecution([HideName] string Host, [Parameter("w")] int? Timeout = null);

In your code make and use the proxy like this:

var ping = SpeCLIProxy.Create<Ping>();
var matches = ping.ping(new PingArguments() { Count = pings, Host = "127.0.0.1", Timeout = 50 });

This will run the CLI and parse the output all automatically, providing a strongly typed interface to a CLI you only need to configure once.