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https://github.com/lorensr/temporal-time-utils

This is a library with some reusable functions for Temporal.io TypeScript SDK
https://github.com/lorensr/temporal-time-utils

job-scheduler nodejs temporalio timers

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This is a library with some reusable functions for Temporal.io TypeScript SDK

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# temporal-time-utils



This is a library with some reusable functions for [Temporal.io TypeScript SDK](https://docs.temporal.io/docs/typescript/introduction):



- `sleepUntil`: sleep to a specific date, instead of by number of milliseconds

- `UpdatableTimer`: sleep to a specific date, updatable and queryable

- `ScheduleWorkflow`: *[Deprecated in favor of [Schedules](https://docs.temporal.io/workflows#schedule)]* schedule other workflows by extended cron syntax, with support for jitter, timezone, max invocations, manual triggers, pausing/unpausing, querying future executions, and more.



This serves as both a utility library and a demonstration of how you can publish reusable Temporal libraries (both for Workflows and Activities).



⚠️ **Note:** This is not an officially supported Temporal library due to the fact that `sleepUntil` and `UpdatableTimer` are not guaranteed to be accurate: the number of milliseconds until the given date is calculated up front, so if any time/date adjustments are made (like changes in timezones, daylight savings, leap seconds), the timer may not fire at the exact correct time.



```ts

npm i temporal-time-utils

```



## `sleepUntil`



This is a simple drop in replacement for Temporal's `workflow.sleep()` API for when you need to sleep to a specific date rather than a fixed number of milliseconds.



```ts

import { sleepUntil } from "temporal-time-utils";



// inside workflow function

sleepUntil("30 Sep " + (new Date().getFullYear() + 1)); // wake up when September ends

sleepUntil("5 Nov 2022 00:12:34 GMT"); // wake up at specific time and timezone



// optional 2nd arg

sleepUntil("5 Nov 2022 00:12:34 GMT", specificDateTime); // take control over the "start" time in case you need to

```



This is a very simple function - under the hood it just uses `date-fns/differenceInMilliseconds` to calculate time difference.



This is discussed in the docs https://docs.temporal.io/docs/typescript/workflows#sleep



## `UpdatableTimer`



`sleep` only lets you set a fixed time upfront.

`UpdatableTimer` is a special class that lets you update that while sleeping.

You can consider it the next step up from `sleepUntil`.



After you instantiate it with an initial datetime to wake up at, it exposes only two APIs: `then()` for you to `await`, and `.deadline` that you can set and get.



```ts

// example usage inside workflow function

export async function countdownWorkflow(initialDeadline: Date): Promise {

  const timer = new UpdatableTimer(initialDeadline);

  wf.setHandler(

    setDeadlineSignal,

    (deadline) => void (timer.deadline = deadline)

  ); // send in new deadlines via Signal

  wf.setHandler(timeLeftQuery, () => timer.deadline - Date.now()); // get time left via Query

  await timer; // if you send in a signal with a new time, this timer will resolve earlier!

  console.log("countdown done!");

}

```



This is discussed in the docs https://docs.temporal.io/docs/typescript/workflows#async-design-patterns.



## `ScheduleWorkflow`



A Workflow that schedules other Workflows.



This is a premade Workflow that you can register in a Worker and call from a client, to invoke other Workflows on a schedule. You can consider this the next step up from "Cron Workflows".



See example usage inside of `/apps/fixture`:



- https://github.com/lorensr/temporal-time-utils/blob/main/apps/fixture/src/client.ts invoke the `ScheduleWorkflow` and pass in an `example` Workflow to call on a schedule

- https://github.com/lorensr/temporal-time-utils/blob/main/apps/fixture/src/workflows.ts#L5 necessary export for Worker to pick it up



```ts

// inside client file

async function run() {

  const client = new WorkflowClient();

  const handle = await client.start(ScheduleWorkflow, {

    args: [

      "exampleWorkflow", // workflow to be executed on a schedule. must be string name.

      {

        args: ["Example arg payload"], // static for now, but possible to modify to make dynamic in future - ask swyx

        // // regular workflow options apply here, with two additions (defaults shown):

        // cancellationType: ChildWorkflowCancellationType.WAIT_CANCELLATION_COMPLETED,

        // parentClosePolicy: ParentClosePolicy.PARENT_CLOSE_POLICY_TERMINATE

      },

      {

        // args

        cronParser: {

          expression: "* * * * *", // every minute

          // options: https://www.npmjs.com/package/cron-parser#user-content-options

        },

        // maxInvocations?: number;

        // jitterMs?: number;

      },

    ],

    taskQueue: "tutorial",

    workflowId: "my-schedule-id",

  });

}

```



This uses https://www.npmjs.com/package/cron-parser under the hood, thereby getting support for things like timezones and "last of the week" extensions to the cron syntax:



```ts

// client.ts

const handle = await client.start(ScheduleWorkflow, {

  args: [

    "exampleWorkflow", // as above

    {}, // if no args needed

    {

      // scheduleOptions

      cronParser: {

        expression: "0 0 * * * 1,3L", // run every Monday as well as the last Wednesday of the month

        options: {

          currentDate: "2016-03-27 00:00:01",

          endDate: new Date("Wed, 26 Dec 2012 14:40:00 UTC"),

          tz: "Europe/Athens",

        },

      },

      maxInvocations: 500,

      jitterMs: 1000,

    },

  ],

  taskQueue: "scheduler",

  workflowId: "schedule-for-" + userId,

});

```



The Workflow exposes a number of useful queries and signals:



```ts

import {

  numInvocationsQuery,

  futureScheduleQuery,

  manualTriggerSignal,

  ScheduleWorkflowState,

  stateSignal,

  stateQuery,

  // ...

} from "temporal-time-utils";



await handle.query(numInvocationsQuery); // get how many times exampleWorkflow has been invoked by ScheduleWorkflow

await handle.query(futureScheduleQuery, 3); // get the next 3 times it is set to be invoked. defaults to 5

await handle.signal(manualTriggerSignal); // manually trigger workflow

await handle.signal(stateSignal, "PAUSED" as ScheduleWorkflowState); // pause workflow

await handle.signal(stateSignal, "RUNNING" as ScheduleWorkflowState); // resume workflow

await handle.cancel(); // stop schedule workflow completely

await handle.query(stateQuery); // get wf state (running, paused, or stopped)

```



This is a decoupled and slightly modified variant of what was discussed in the docs: https://docs.temporal.io/docs/typescript/workflows#schedule-workflow-example



## Monorepo details



This project is bootstrapped with https://turborepo.org/.



### Build



To build all apps and packages, run the following command:



```

cd my-turborepo

npm run build

```



### Develop



To develop all apps and packages, run the following command:



```

cd my-turborepo

npm run dev

```



### Remote Caching



Turborepo can use a technique known as [Remote Caching (Beta)](https://turborepo.org/docs/features/remote-caching) to share cache artifacts across machines, enabling you to share build caches with your team and CI/CD pipelines.



```

cd my-turborepo

npx turbo login

npx turbo link

```