Eternal orchestrations

[FunctionName("Periodic_Cleanup_Loop")]
public static async Task Run(
    [OrchestrationTrigger] IDurableOrchestrationContext context)
{
    await context.CallActivityAsync("DoCleanup", null);

    // sleep for one hour between cleanups
    DateTime nextCleanup = context.CurrentUtcDateTime.AddHours(1);
    await context.CreateTimer(nextCleanup, CancellationToken.None);

    context.ContinueAsNew(null);
}

const df = require("durable-functions");
const moment = require("moment");

module.exports = df.orchestrator(function*(context) {
    yield context.df.callActivity("DoCleanup");

    // sleep for one hour between cleanups
    const nextCleanup = moment.utc(context.df.currentUtcDateTime).add(1, "h");
    yield context.df.createTimer(nextCleanup.toDate());

    yield context.df.continueAsNew(undefined);
});

import azure.functions as func
import azure.durable_functions as df
from datetime import datetime, timedelta

def orchestrator_function(context: df.DurableOrchestrationContext):
    yield context.call_activity("DoCleanup")

    # sleep for one hour between cleanups
    next_cleanup = context.current_utc_datetime + timedelta(hours = 1)
    yield context.create_timer(next_cleanup)

    context.continue_as_new(None)

main = df.Orchestrator.create(orchestrator_function)

PowerShell doesn't support continue-as-new.

@FunctionName("Periodic_Cleanup_Loop")
public void periodicCleanupLoop(
        @DurableOrchestrationTrigger(name = "ctx") TaskOrchestrationContext ctx) {
    ctx.callActivity("DoCleanup").await();

    ctx.createTimer(Duration.ofHours(1)).await();

    ctx.continueAsNew(null);
}

public class PeriodicCleanupLoop : TaskOrchestrator<object?, object?>
{
    public override async Task<object?> RunAsync(TaskOrchestrationContext context, object? input)
    {
        await context.CallActivityAsync("DoCleanup");

        // sleep for one hour between cleanups
        await context.CreateTimer(TimeSpan.FromHours(1), CancellationToken.None);

        context.ContinueAsNew(null);
        return null;
    }
}

from datetime import timedelta
from durabletask import task

def do_cleanup(ctx: task.ActivityContext, _) -> None:
    # Cleanup logic here
    pass

def periodic_cleanup_loop(ctx: task.OrchestrationContext, _):
    yield ctx.call_activity(do_cleanup)

    # sleep for one hour between cleanups
    yield ctx.create_timer(timedelta(hours=1))

    ctx.continue_as_new(None)

public class PeriodicCleanupLoop implements TaskOrchestration {
    @Override
    public void run(TaskOrchestrationContext ctx) {
        ctx.callActivity("DoCleanup").await();

        // sleep for one hour between cleanups
        ctx.createTimer(Duration.ofHours(1)).await();

        ctx.continueAsNew(null);
    }
}

import { ActivityContext, OrchestrationContext, TOrchestrator } from "@microsoft/durabletask-js";

const doCleanup = async (_: ActivityContext, _input: void): Promise<void> => {
    // Cleanup logic here
};

const periodicCleanupLoop: TOrchestrator = async function* (ctx: OrchestrationContext): any {
    yield ctx.callActivity(doCleanup);

    // sleep for one hour between cleanups
    yield ctx.createTimer(60 * 60);

    ctx.continueAsNew(null, false);
};

The Durable Task SDK isn't available for PowerShell. Use Durable Functions instead.

[FunctionName("Trigger_Eternal_Orchestration")]
public static async Task<HttpResponseMessage> OrchestrationTrigger(
    [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequestMessage request,
    [DurableClient] IDurableOrchestrationClient client)
{
    string instanceId = "StaticId";

    await client.StartNewAsync("Periodic_Cleanup_Loop", instanceId); 
    return client.CreateCheckStatusResponse(request, instanceId);
}

const df = require("durable-functions");

module.exports = async function (context, req) {
    const client = df.getClient(context);
    const instanceId = "StaticId";

    // null is used as the input, since there is no input in "Periodic_Cleanup_Loop".
    await client.startNew("Periodic_Cleanup_Loop", instanceId, null);

    context.log(`Started orchestration with ID = '${instanceId}'.`);
    return client.createCheckStatusResponse(context.bindingData.req, instanceId);
};

async def main(req: func.HttpRequest, starter: str) -> func.HttpResponse:
    client = df.DurableOrchestrationClient(starter)
    instance_id = 'StaticId'

    await client.start_new('Periodic_Cleanup_Loop', instance_id, None)

    logging.info(f"Started orchestration with ID = '{instance_id}'.")
    return client.create_check_status_response(req, instance_id)

PowerShell doesn't support continue-as-new.

@FunctionName("Trigger_Eternal_Orchestration")
public HttpResponseMessage triggerEternalOrchestration(
        @HttpTrigger(name = "req") HttpRequestMessage<?> req,
        @DurableClientInput(name = "durableContext") DurableClientContext durableContext) {

    String instanceID = "StaticID";
    DurableTaskClient client = durableContext.getClient();
    client.scheduleNewOrchestrationInstance("Periodic_Cleanup_Loop", null, instanceID);
    return durableContext.createCheckStatusResponse(req, instanceID);
}

string instanceId = "StaticId";
await client.ScheduleNewOrchestrationInstanceAsync(
    "PeriodicCleanupLoop",
    null,
    new StartOrchestrationOptions { InstanceId = instanceId });

instance_id = "StaticId"
client.schedule_new_orchestration(periodic_cleanup_loop, instance_id=instance_id)

String instanceId = "StaticId";
client.scheduleNewOrchestrationInstance("PeriodicCleanupLoop", null, instanceId);

const instanceId = "StaticId";
await client.scheduleNewOrchestration(periodicCleanupLoop, undefined, instanceId);

The Durable Task SDK is not available for PowerShell. Use Durable Functions instead.

await client.TerminateInstanceAsync(instanceId, "Cleanup no longer needed");

client.terminate_orchestration(instance_id, output="Cleanup no longer needed")

client.terminate(instanceId, "Cleanup no longer needed");

await client.terminateOrchestration(instanceId, "Cleanup no longer needed");

The Durable Task SDK is not available for PowerShell. Use Durable Functions instead.