XpandPosh

1.9.0

Cmdlets/src/XpandPosh.Cmdlets/InvokeParallel/Invoke-Parallel.cs

                                using System;

using System.Collections.Generic;

using System.Linq;

using System.Management.Automation;

using System.Management.Automation.Runspaces;

using System.Reactive.Concurrency;

using System.Reactive.Linq;

using System.Reactive.Threading.Tasks;

using System.Threading;

using System.Threading.Tasks;

using XpandPosh.CmdLets;

namespace XpandPosh.Cmdlets.InvokeParallel{

    [Cmdlet(VerbsLifecycle.Invoke, "Parallel")]

    [CmdletBinding]

    public class InvokeParallel : XpandCmdlet{

        private List<object> _values;

        private PSVariable[] _psVariables;

        [Parameter(Mandatory = true, Position = 1)]

        public ScriptBlock Script{ get; set; }

        [Parameter]

        public string[] VariablesToImport{ get; set; } = new string[0];

        [Parameter(Mandatory = true, Position = 0, ValueFromPipeline = true)]

        public object Value{ get; set; }

        [Parameter]

        public int RetryOnError{ get; set; } = 0;

        [Parameter]

        public int RetryDelay{ get; set; } = 3000;

        [Parameter]

        public int StepInterval{ get; set; } 

        protected override Task BeginProcessingAsync(){

            _values = new List<object>();

            _psVariables = this.Invoke<PSVariable>("Get-Variable")

                .Where(variable => VariablesToImport.Contains(variable.Name)).ToArray();

            return base.BeginProcessingAsync();

        }

        protected override Task ProcessRecordAsync(){

            _values.Add(Value);

            return base.ProcessRecordAsync();

        }

        protected override Task EndProcessingAsync(){

            if (!_values.Any()){

                return Task.CompletedTask;

            }

            var signal = Enumerable.Range(0,RetryOnError).ToObservable()

                .Delay(TimeSpan.FromMilliseconds(RetryDelay)).Publish().AutoConnect();

            var eventLoopScheduler = new EventLoopScheduler(start => new Thread(start));

            var synchronizationContext = SynchronizationContext.Current;

            var values = _values.ToObservable();

            if (StepInterval > 0){

                values=values.StepInterval(TimeSpan.FromMilliseconds(StepInterval),eventLoopScheduler);

            }

            return values

                .SelectMany((o, i) => Observable.Start(() => {

                        using (var runspace = RunspaceFactory.CreateRunspace()){

                            runspace.Open();

                            runspace.SetVariable(new PSVariable("_", o));

                            runspace.SetVariable(_psVariables);

                            var psObjects = runspace.Invoke(Script.ToString());

                            var lastExitCode = runspace.Invoke("$LastExitCode").FirstOrDefault();

                            if (lastExitCode != null&& ((int) lastExitCode.BaseObject) >0){

                                var error = string.Join(Environment.NewLine,runspace.Invoke("$Error"));

                                if (!string.IsNullOrWhiteSpace(error)){

                                    throw new Exception($"ExitCode:{lastExitCode}{Environment.NewLine}Errors: {error}{Environment.NewLine}Script:{Script}");

                                }

                            }

                            runspace.Close();

                            return psObjects;

                        }

                    })

                    .RetryWhen(_ => _.SelectMany(exception => signal.Concat(Observable.Throw<int>(exception))))

                    .HandleErrors(this, ActivityName,synchronizationContext))

                .WriteObject(this,_values.Count)

                .ToTask();

        }

    }

}