finished unit tests and docstrings

MalwareMultiScan.Backends/Services/Implementations/ProcessRunner.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using System.Threading;
+using MalwareMultiScan.Backends.Services.Interfaces;
+using Microsoft.Extensions.Logging;
+
+namespace MalwareMultiScan.Backends.Services.Implementations
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    [ExcludeFromCodeCoverage]
+    public class ProcessRunner : IProcessRunner
+    {
+        private readonly ILogger<ProcessRunner> _logger;
+
+        /// <summary>
+        /// Initialize process runner.
+        /// </summary>
+        /// <param name="logger">Logger.</param>
+        public ProcessRunner(ILogger<ProcessRunner> logger)
+        {
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="path"></param>
+        /// <param name="arguments"></param>
+        /// <param name="cancellationToken"></param>
+        /// <param name="standardOutput"></param>
+        /// <param name="standardError"></param>
+        /// <returns></returns>
+        /// <exception cref="TimeoutException"></exception>
+        public int RunTillCompletion(string path, string arguments, CancellationToken cancellationToken,
+            out string standardOutput, out string standardError)
+        {
+            var process = new Process
+            {
+                StartInfo = new ProcessStartInfo(path, arguments)
+                {
+                    RedirectStandardError = true,
+                    RedirectStandardOutput = true,
+                    WorkingDirectory = Path.GetDirectoryName(path) ?? Directory.GetCurrentDirectory()
+                }
+            };
+
+            _logger.LogInformation(
+                $"Starting process {process.StartInfo.FileName} " +
+                $"with arguments {process.StartInfo.Arguments} " +
+                $"in working directory {process.StartInfo.WorkingDirectory}");
+
+            process.Start();
+
+            cancellationToken.Register(() =>
+            {
+                if (process.HasExited)
+                    return;
+
+                process.Kill(true);
+
+                throw new TimeoutException("Scanning failed to complete within the timeout");
+            });
+
+            process.WaitForExit();
+
+            _logger.LogInformation($"Process has exited with code {process.ExitCode}");
+
+            standardOutput = process.StandardOutput.ReadToEnd();
+            standardError = process.StandardError.ReadToEnd();
+
+            _logger.LogDebug($"Process standard output: {standardOutput}");
+            _logger.LogDebug($"Process standard error: {standardError}");
+
+            return process.ExitCode;
+        }
+    }
+}