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Update SDK and add context propagation sample (temporalio#68)
Fixes temporalio#14
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169 changes: 169 additions & 0 deletions
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src/ContextPropagation/ContextPropagationInterceptor.cs
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| namespace TemporalioSamples.ContextPropagation; | ||
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| using System.Threading.Tasks; | ||
| using Temporalio.Api.Common.V1; | ||
| using Temporalio.Client; | ||
| using Temporalio.Client.Interceptors; | ||
| using Temporalio.Converters; | ||
| using Temporalio.Worker.Interceptors; | ||
| using Temporalio.Workflows; | ||
|
|
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| /// <summary> | ||
| /// General purpose interceptor that can be used to propagate async-local context through workflows | ||
| /// and activities. This must be set on the client used for interacting with workflows and used for | ||
| /// the worker. | ||
| /// </summary> | ||
| /// <typeparam name="T">Context data type.</typeparam> | ||
| public class ContextPropagationInterceptor<T> : IClientInterceptor, IWorkerInterceptor | ||
| { | ||
| private readonly AsyncLocal<T> context; | ||
| private readonly IPayloadConverter payloadConverter; | ||
| private readonly string headerKey; | ||
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| public ContextPropagationInterceptor( | ||
| AsyncLocal<T> context, | ||
| IPayloadConverter payloadConverter, | ||
| string headerKey = "__my_context_key") | ||
| { | ||
| this.context = context; | ||
| this.payloadConverter = payloadConverter; | ||
| this.headerKey = headerKey; | ||
| } | ||
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| public ClientOutboundInterceptor InterceptClient(ClientOutboundInterceptor nextInterceptor) => | ||
| new ContextPropagationClientOutboundInterceptor(this, nextInterceptor); | ||
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| public WorkflowInboundInterceptor InterceptWorkflow(WorkflowInboundInterceptor nextInterceptor) => | ||
| new ContextPropagationWorkflowInboundInterceptor(this, nextInterceptor); | ||
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| public ActivityInboundInterceptor InterceptActivity(ActivityInboundInterceptor nextInterceptor) => | ||
| new ContextPropagationActivityInboundInterceptor(this, nextInterceptor); | ||
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| private Dictionary<string, Payload> HeaderFromContext(IDictionary<string, Payload>? existing) | ||
| { | ||
| var ret = existing != null ? | ||
| new Dictionary<string, Payload>(existing) : new Dictionary<string, Payload>(1); | ||
| ret[headerKey] = payloadConverter.ToPayload(context.Value); | ||
| return ret; | ||
| } | ||
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| private void WithHeadersApplied(IReadOnlyDictionary<string, Payload>? headers, Action func) => | ||
| WithHeadersApplied( | ||
| headers, | ||
| () => | ||
| { | ||
| func(); | ||
| return (object?)null; | ||
| }); | ||
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| private TResult WithHeadersApplied<TResult>( | ||
| IReadOnlyDictionary<string, Payload>? headers, Func<TResult> func) | ||
| { | ||
| if (headers?.TryGetValue(headerKey, out var payload) == true && payload != null) | ||
| { | ||
| context.Value = payloadConverter.ToValue<T>(payload); | ||
| } | ||
| // These are async local, no need to unapply afterwards | ||
| return func(); | ||
| } | ||
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| private class ContextPropagationClientOutboundInterceptor : ClientOutboundInterceptor | ||
| { | ||
| private readonly ContextPropagationInterceptor<T> root; | ||
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| public ContextPropagationClientOutboundInterceptor( | ||
| ContextPropagationInterceptor<T> root, ClientOutboundInterceptor next) | ||
| : base(next) => this.root = root; | ||
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| public override Task<WorkflowHandle<TWorkflow, TResult>> StartWorkflowAsync<TWorkflow, TResult>( | ||
| StartWorkflowInput input) => | ||
| base.StartWorkflowAsync<TWorkflow, TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task SignalWorkflowAsync(SignalWorkflowInput input) => | ||
| base.SignalWorkflowAsync( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task<TResult> QueryWorkflowAsync<TResult>(QueryWorkflowInput input) => | ||
| base.QueryWorkflowAsync<TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task<WorkflowUpdateHandle<TResult>> StartWorkflowUpdateAsync<TResult>( | ||
| StartWorkflowUpdateInput input) => | ||
| base.StartWorkflowUpdateAsync<TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
| } | ||
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| private class ContextPropagationWorkflowInboundInterceptor : WorkflowInboundInterceptor | ||
| { | ||
| private readonly ContextPropagationInterceptor<T> root; | ||
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| public ContextPropagationWorkflowInboundInterceptor( | ||
| ContextPropagationInterceptor<T> root, WorkflowInboundInterceptor next) | ||
| : base(next) => this.root = root; | ||
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| public override void Init(WorkflowOutboundInterceptor outbound) => | ||
| base.Init(new ContextPropagationWorkflowOutboundInterceptor(root, outbound)); | ||
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| public override Task<object?> ExecuteWorkflowAsync(ExecuteWorkflowInput input) => | ||
| root.WithHeadersApplied(Workflow.Info.Headers, () => Next.ExecuteWorkflowAsync(input)); | ||
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| public override Task HandleSignalAsync(HandleSignalInput input) => | ||
| root.WithHeadersApplied(input.Headers, () => Next.HandleSignalAsync(input)); | ||
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| public override object? HandleQuery(HandleQueryInput input) => | ||
| root.WithHeadersApplied(input.Headers, () => Next.HandleQuery(input)); | ||
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| public override void ValidateUpdate(HandleUpdateInput input) => | ||
| root.WithHeadersApplied(input.Headers, () => Next.ValidateUpdate(input)); | ||
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| public override Task<object?> HandleUpdateAsync(HandleUpdateInput input) => | ||
| root.WithHeadersApplied(input.Headers, () => Next.HandleUpdateAsync(input)); | ||
| } | ||
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| private class ContextPropagationWorkflowOutboundInterceptor : WorkflowOutboundInterceptor | ||
| { | ||
| private readonly ContextPropagationInterceptor<T> root; | ||
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| public ContextPropagationWorkflowOutboundInterceptor( | ||
| ContextPropagationInterceptor<T> root, WorkflowOutboundInterceptor next) | ||
| : base(next) => this.root = root; | ||
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| public override Task<TResult> ScheduleActivityAsync<TResult>( | ||
| ScheduleActivityInput input) => | ||
| Next.ScheduleActivityAsync<TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task<TResult> ScheduleLocalActivityAsync<TResult>( | ||
| ScheduleLocalActivityInput input) => | ||
| Next.ScheduleLocalActivityAsync<TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
|
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| public override Task SignalChildWorkflowAsync( | ||
| SignalChildWorkflowInput input) => | ||
| Next.SignalChildWorkflowAsync( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task SignalExternalWorkflowAsync( | ||
| SignalExternalWorkflowInput input) => | ||
| Next.SignalExternalWorkflowAsync( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
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| public override Task<ChildWorkflowHandle<TWorkflow, TResult>> StartChildWorkflowAsync<TWorkflow, TResult>( | ||
| StartChildWorkflowInput input) => | ||
| Next.StartChildWorkflowAsync<TWorkflow, TResult>( | ||
| input with { Headers = root.HeaderFromContext(input.Headers) }); | ||
| } | ||
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| private class ContextPropagationActivityInboundInterceptor : ActivityInboundInterceptor | ||
| { | ||
| private readonly ContextPropagationInterceptor<T> root; | ||
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| public ContextPropagationActivityInboundInterceptor( | ||
| ContextPropagationInterceptor<T> root, ActivityInboundInterceptor next) | ||
| : base(next) => this.root = root; | ||
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| public override Task<object?> ExecuteActivityAsync(ExecuteActivityInput input) => | ||
| root.WithHeadersApplied(input.Headers, () => Next.ExecuteActivityAsync(input)); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| namespace TemporalioSamples.ContextPropagation; | ||
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| public static class MyContext | ||
| { | ||
| public static readonly AsyncLocal<string> UserId = new(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| using Microsoft.Extensions.Logging; | ||
| using Temporalio.Client; | ||
| using Temporalio.Converters; | ||
| using Temporalio.Worker; | ||
| using TemporalioSamples.ContextPropagation; | ||
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| using var loggerFactory = LoggerFactory.Create(builder => | ||
| builder. | ||
| AddSimpleConsole(options => options.TimestampFormat = "[HH:mm:ss] "). | ||
| SetMinimumLevel(LogLevel.Information)); | ||
| var logger = loggerFactory.CreateLogger<Program>(); | ||
|
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| // Create a client to localhost on default namespace | ||
| var client = await TemporalClient.ConnectAsync(new("localhost:7233") | ||
| { | ||
| LoggerFactory = loggerFactory, | ||
| // This is where we set the interceptor to propagate context | ||
| Interceptors = new[] | ||
| { | ||
| new ContextPropagationInterceptor<string>( | ||
| MyContext.UserId, | ||
| DataConverter.Default.PayloadConverter), | ||
| }, | ||
| }); | ||
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| async Task RunWorkerAsync() | ||
| { | ||
| // Cancellation token cancelled on ctrl+c | ||
| using var tokenSource = new CancellationTokenSource(); | ||
| Console.CancelKeyPress += (_, eventArgs) => | ||
| { | ||
| tokenSource.Cancel(); | ||
| eventArgs.Cancel = true; | ||
| }; | ||
|
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| // Run worker until cancelled | ||
| logger.LogInformation("Running worker"); | ||
| using var worker = new TemporalWorker( | ||
| client, | ||
| new TemporalWorkerOptions(taskQueue: "interceptors-sample"). | ||
| AddAllActivities<SayHelloActivities>(new()). | ||
| AddWorkflow<SayHelloWorkflow>()); | ||
| try | ||
| { | ||
| await worker.ExecuteAsync(tokenSource.Token); | ||
| } | ||
| catch (OperationCanceledException) | ||
| { | ||
| logger.LogInformation("Worker cancelled"); | ||
| } | ||
| } | ||
|
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| async Task ExecuteWorkflowAsync() | ||
| { | ||
| // Set our user ID that can be accessed in the workflow and activity | ||
| MyContext.UserId.Value = "some-user"; | ||
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| // Start workflow, send signal, wait for completion, issue query | ||
| logger.LogInformation("Executing workflow"); | ||
| var handle = await client.StartWorkflowAsync( | ||
| (SayHelloWorkflow wf) => wf.RunAsync("Temporal"), | ||
| new(id: "interceptors-workflow-id", taskQueue: "interceptors-sample")); | ||
| await handle.SignalAsync(wf => wf.SignalCompleteAsync()); | ||
| var result = await handle.GetResultAsync(); | ||
| _ = await handle.QueryAsync(wf => wf.IsComplete()); | ||
| logger.LogInformation("Workflow result: {Result}", result); | ||
| } | ||
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| switch (args.ElementAtOrDefault(0)) | ||
| { | ||
| case "worker": | ||
| await RunWorkerAsync(); | ||
| break; | ||
| case "workflow": | ||
| await ExecuteWorkflowAsync(); | ||
| break; | ||
| default: | ||
| throw new ArgumentException("Must pass 'worker' or 'workflow' as the single argument"); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| # Interceptors | ||
|
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| This sample demonstrates how to use interceptors to propagate contextual information from an `AsyncLocal` throughout the | ||
| workflows and activities. While this demonstrates context propagation specifically, it can also be used to show how to | ||
| create interceptors for any other purpose. | ||
|
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| To run, first see [README.md](../../README.md) for prerequisites. Then, run the following from this directory in a | ||
| separate terminal to start the worker: | ||
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| dotnet run worker | ||
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| Then in another terminal, run the workflow from this directory: | ||
|
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| dotnet run workflow | ||
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| The workflow terminal will show the completed workflow result and the worker terminal will show the contextual user ID | ||
| is present in the workflow and activity. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| namespace TemporalioSamples.ContextPropagation; | ||
|
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| using Microsoft.Extensions.Logging; | ||
| using Temporalio.Activities; | ||
|
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| public class SayHelloActivities | ||
| { | ||
| [Activity] | ||
| public string SayHello(string name) | ||
| { | ||
| ActivityExecutionContext.Current.Logger.LogInformation( | ||
| "Activity called by user {UserId}", | ||
| MyContext.UserId.Value); | ||
| return $"Hello, {name}!"; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| namespace TemporalioSamples.ContextPropagation; | ||
|
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| using Microsoft.Extensions.Logging; | ||
| using Temporalio.Workflows; | ||
|
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| [Workflow] | ||
| public class SayHelloWorkflow | ||
| { | ||
| private bool complete; | ||
|
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| [WorkflowRun] | ||
| public async Task<string> RunAsync(string name) | ||
| { | ||
| Workflow.Logger.LogInformation( | ||
| "Workflow called by user {UserId}", | ||
| MyContext.UserId.Value); | ||
|
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| // Wait for signal then run activity | ||
| await Workflow.WaitConditionAsync(() => complete); | ||
| return await Workflow.ExecuteActivityAsync( | ||
| (SayHelloActivities act) => act.SayHello(name), | ||
| new() { StartToCloseTimeout = TimeSpan.FromMinutes(5) }); | ||
| } | ||
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| [WorkflowSignal] | ||
| public async Task SignalCompleteAsync() | ||
| { | ||
| Workflow.Logger.LogInformation( | ||
| "Signal called by user {UserId}", | ||
| MyContext.UserId.Value); | ||
| complete = true; | ||
| } | ||
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| [WorkflowQuery] | ||
| public bool IsComplete() | ||
| { | ||
| Workflow.Logger.LogInformation( | ||
| "Query called by user {UserId}", | ||
| MyContext.UserId.Value); | ||
| return complete; | ||
| } | ||
| } |
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