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Merge pull request #936 from danielgerlag/scheduled-commands
Scheduled commands
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‎ReleaseNotes/3.6.0.md‎

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# Workflow Core 3.6.0
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## Scheduled Commands
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Introduces the ability to schedule delayed commands to process a workflow or event, by persisting them to storage.
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This is the first step toward removing constant polling of the DB. It also filters out duplicate work items on the queue which is the current problem the greylist tries to solve.
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Initial implementation is supported by MongoDb, SQL Server, PostgeSQL, MySQL and SQLite.
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Additional support from the other persistence providers to follow.

‎WorkflowCore.sln‎

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@@ -104,6 +104,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ReleaseNotes", "ReleaseNote
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ReleaseNotes\3.0.0.md = ReleaseNotes\3.0.0.md
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ReleaseNotes\3.1.0.md = ReleaseNotes\3.1.0.md
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ReleaseNotes\3.3.0.md = ReleaseNotes\3.3.0.md
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ReleaseNotes\3.4.0.md = ReleaseNotes\3.4.0.md
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ReleaseNotes\3.6.0.md = ReleaseNotes\3.6.0.md
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EndProjectSection
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WorkflowCore.Sample14", "src\samples\WorkflowCore.Sample14\WorkflowCore.Sample14.csproj", "{6BC66637-B42A-4334-ADFB-DBEC9F29D293}"

‎src/Directory.Build.props‎

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<PackageLicenseUrl>https://github.com/danielgerlag/workflow-core/blob/master/LICENSE.md</PackageLicenseUrl>
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<RepositoryType>git</RepositoryType>
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<RepositoryUrl>https://github.com/danielgerlag/workflow-core.git</RepositoryUrl>
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<Version>3.5.7</Version>
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<AssemblyVersion>3.5.7.0</AssemblyVersion>
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<FileVersion>3.5.7.0</FileVersion>
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<Version>3.6.0</Version>
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<AssemblyVersion>3.6.0.0</AssemblyVersion>
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<FileVersion>3.6.0.0</FileVersion>
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<PackageIconUrl>https://github.com/danielgerlag/workflow-core/raw/master/src/logo.png</PackageIconUrl>
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<PackageVersion>3.5.7</PackageVersion>
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<PackageVersion>3.6.0</PackageVersion>
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</PropertyGroup>
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</Project>

‎src/WorkflowCore/Interface/Persistence/IPersistenceProvider.cs‎

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@@ -6,7 +6,7 @@
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namespace WorkflowCore.Interface
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{
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public interface IPersistenceProvider : IWorkflowRepository, ISubscriptionRepository, IEventRepository
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public interface IPersistenceProvider : IWorkflowRepository, ISubscriptionRepository, IEventRepository, IScheduledCommandRepository
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{
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Task PersistErrors(IEnumerable<ExecutionError> errors, CancellationToken cancellationToken = default);

‎src/WorkflowCore/Interface/Persistence/IScheduledCommandRepository.cs‎

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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using WorkflowCore.Models;
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namespace WorkflowCore.Interface
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{
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public interface IScheduledCommandRepository
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{
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bool SupportsScheduledCommands { get; }
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Task ScheduleCommand(ScheduledCommand command);
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Task ProcessCommands(DateTimeOffset asOf, Func<ScheduledCommand, Task> action, CancellationToken cancellationToken = default);
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}
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}

‎src/WorkflowCore/Models/ScheduledCommand.cs‎

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace WorkflowCore.Models
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{
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public class ScheduledCommand
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{
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public const string ProcessWorkflow = "ProcessWorkflow";
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public const string ProcessEvent = "ProcessEvent";
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public string CommandName { get; set; }
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public string Data { get; set; }
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public long ExecuteTime { get; set; }
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}
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}

‎src/WorkflowCore/Services/BackgroundTasks/RunnablePoller.cs‎

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@@ -1,6 +1,7 @@
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using System;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using Microsoft.Extensions.Logging;
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using WorkflowCore.Interface;
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using WorkflowCore.Models;
@@ -48,17 +49,41 @@ public void Stop()
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/// Poll the persistence store for stashed unpublished events
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/// </summary>
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private async void PollRunnables(object target)
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{
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await PollWorkflows();
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await PollEvents();
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await PollCommands();
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}
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private async Task PollWorkflows()
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{
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try
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{
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if (await _lockProvider.AcquireLock("poll runnables", new CancellationToken()))
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{
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try
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{
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_logger.LogInformation("Polling for runnable workflows");
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_logger.LogInformation("Polling for runnable workflows");
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var runnables = await _persistenceStore.GetRunnableInstances(_dateTimeProvider.Now);
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foreach (var item in runnables)
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{
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if (_persistenceStore.SupportsScheduledCommands)
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{
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try
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{
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await _persistenceStore.ScheduleCommand(new ScheduledCommand()
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{
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CommandName = ScheduledCommand.ProcessWorkflow,
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Data = item,
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ExecuteTime = _dateTimeProvider.UtcNow.Ticks
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});
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continue;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, ex.Message);
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}
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}
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if (_greylist.Contains($"wf:{item}"))
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{
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_logger.LogDebug($"Got greylisted workflow {item}");
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{
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_logger.LogError(ex, ex.Message);
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}
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}
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private async Task PollEvents()
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{
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try
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{
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if (await _lockProvider.AcquireLock("unprocessed events", new CancellationToken()))
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{
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try
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{
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_logger.LogInformation("Polling for unprocessed events");
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_logger.LogInformation("Polling for unprocessed events");
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var events = await _persistenceStore.GetRunnableEvents(_dateTimeProvider.Now);
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foreach (var item in events.ToList())
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{
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if (_persistenceStore.SupportsScheduledCommands)
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{
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try
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{
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await _persistenceStore.ScheduleCommand(new ScheduledCommand()
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{
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CommandName = ScheduledCommand.ProcessEvent,
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Data = item,
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ExecuteTime = _dateTimeProvider.UtcNow.Ticks
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});
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continue;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, ex.Message);
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}
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}
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if (_greylist.Contains($"evt:{item}"))
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{
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_logger.LogDebug($"Got greylisted event {item}");
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_logger.LogError(ex, ex.Message);
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}
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}
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private async Task PollCommands()
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{
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try
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{
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if (await _lockProvider.AcquireLock("poll-commands", new CancellationToken()))
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{
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try
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{
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_logger.LogInformation("Polling for scheduled commands");
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await _persistenceStore.ProcessCommands(new DateTimeOffset(_dateTimeProvider.UtcNow), async (command) =>
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{
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switch (command.CommandName)
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{
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case ScheduledCommand.ProcessWorkflow:
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await _queueProvider.QueueWork(command.Data, QueueType.Workflow);
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break;
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case ScheduledCommand.ProcessEvent:
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await _queueProvider.QueueWork(command.Data, QueueType.Event);
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break;
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}
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});
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}
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finally
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{
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await _lockProvider.ReleaseLock("poll-commands");
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}
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}
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}
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catch (Exception ex)
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{
190+
_logger.LogError(ex, ex.Message);
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}
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}
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}
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}

‎src/WorkflowCore/Services/BackgroundTasks/WorkflowConsumer.cs‎

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await _persistenceStore.PersistErrors(result.Errors, cancellationToken);
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72-
var readAheadTicks = _datetimeProvider.UtcNow.Add(Options.PollInterval).Ticks;
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74-
if ((workflow.Status == WorkflowStatus.Runnable) && workflow.NextExecution.HasValue && workflow.NextExecution.Value < readAheadTicks)
72+
if ((workflow.Status == WorkflowStatus.Runnable) && workflow.NextExecution.HasValue)
7573
{
76-
new Task(() => FutureQueue(workflow, cancellationToken)).Start();
74+
var readAheadTicks = _datetimeProvider.UtcNow.Add(Options.PollInterval).Ticks;
75+
if (workflow.NextExecution.Value < readAheadTicks)
76+
{
77+
new Task(() => FutureQueue(workflow, cancellationToken)).Start();
78+
}
79+
else
80+
{
81+
if (_persistenceStore.SupportsScheduledCommands)
82+
{
83+
await _persistenceStore.ScheduleCommand(new ScheduledCommand()
84+
{
85+
CommandName = ScheduledCommand.ProcessWorkflow,
86+
Data = workflow.Id,
87+
ExecuteTime = workflow.NextExecution.Value
88+
});
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}
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}
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}
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}
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}

‎src/WorkflowCore/Services/DefaultProviders/MemoryPersistenceProvider.cs‎

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private readonly List<Event> _events = new List<Event>();
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private readonly List<ExecutionError> _errors = new List<ExecutionError>();
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27+
public bool SupportsScheduledCommands => false;
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public async Task<string> CreateNewWorkflow(WorkflowInstance workflow, CancellationToken _ = default)
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{
2931
lock (_instances)
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255257
_errors.AddRange(errors);
256258
}
257259
}
260+
261+
public Task ScheduleCommand(ScheduledCommand command)
262+
{
263+
throw new NotImplementedException();
264+
}
265+
266+
public Task ProcessCommands(DateTimeOffset asOf, Func<ScheduledCommand, Task> action, CancellationToken cancellationToken = default)
267+
{
268+
throw new NotImplementedException();
269+
}
258270
}
259271

260272
#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously

‎src/WorkflowCore/Services/DefaultProviders/TransientMemoryPersistenceProvider.cs‎

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{
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private readonly ISingletonMemoryProvider _innerService;
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public bool SupportsScheduledCommands => false;
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1416
public TransientMemoryPersistenceProvider(ISingletonMemoryProvider innerService)
1517
{
1618
_innerService = innerService;
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public Task<bool> SetSubscriptionToken(string eventSubscriptionId, string token, string workerId, DateTime expiry, CancellationToken _ = default) => _innerService.SetSubscriptionToken(eventSubscriptionId, token, workerId, expiry);
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5860
public Task ClearSubscriptionToken(string eventSubscriptionId, string token, CancellationToken _ = default) => _innerService.ClearSubscriptionToken(eventSubscriptionId, token);
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62+
public Task ScheduleCommand(ScheduledCommand command)
63+
{
64+
throw new NotImplementedException();
65+
}
66+
67+
public Task ProcessCommands(DateTimeOffset asOf, Func<ScheduledCommand, Task> action, CancellationToken cancellationToken = default)
68+
{
69+
throw new NotImplementedException();
70+
}
5971
}
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}

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