Schedules

1. System Context

Developers use Nitric to defined scheduled tasks within their application.

  • App code uses the Schedule resource from the Nitric SDK.
  • Developers configure the schedule with CRON or rate expressions like '7 days' and implement application logic to be executed when triggered.

Operations use default/extended or overridden Terraform modules to provision the necessary resources to run the app logic on the defined schedule.

Example AWS Provider
  • Lambda function is deployed as a packaged container image uploaded to an Amazon Elastic Container Registry (Amazon ECR).
  • AWS EventBridge is used to schedule and trigger Lambda functions.
  • AWS IAM provides the role/policies allowing EventBridge to invoke the Lambda functions securely.
Code
Terraform
Create AWS schedules
Create AWS IAM Roles / Policies
Invokes
Attach Policy
Deploy Container App
Developer
Operations
nitric up
EventBridge
(AWS Scheduler)
AWS Lambda
Deployed function(s)
AWS IAM
Example GCP Provider
  • Google Cloud Run is deployed as a container image stored in Google Artifact Registry (GCR).
  • Google Cloud Scheduler is used to schedule and trigger Google Cloud Run functions via an HTTP trigger.
  • Google IAM provides the role/policies allowing Cloud Scheduler to invoke the Cloud Run service securely.
Code
Terraform
Create GCP schedules
Create GCP IAM Roles / Policies
Invokes
Attach Policy
Deploy Container App
Developer
Operations
nitric up
Cloud Scheduler
(GCP Scheduler)
Google Cloud Run
Deployed function(s)
Google IAM

2. Sequence

DeveloperNitric SDKNitric RuntimeCloud SchedulerApplication WorkerDefine schedule (e.g., CRON job)Deploy schedule configurationCreate schedule in cloud schedulerTrigger scheduled task (e.g., CRON event)Forward scheduled event with payloadProcess task and return resultConfirm execution (success or error)DeveloperNitric SDKNitric RuntimeCloud SchedulerApplication Worker

3. Component

Schedule Module

  • Dynamically creates the necessary roles and permissions for the scheduling service to securely trigger application tasks, enforcing the principle of least privilege.
  • Configures the scheduling system with CRON or rate expressions and supports additional parameters like time zones for flexibility.
  • Automatically attaches policies to allow secure invocation of application functions or services when schedules are triggered.
  • Supports passing custom event payloads to tasks, enabling dynamic behavior and workflows.
  • Abstracts the underlying scheduler implementations, allowing developers and operations teams to interact with a unified scheduling interface without concerning themselves with provider-specific configurations.
  • Enables seamless integration of recurring or scheduled tasks into applications without manual setup of complex cloud-native scheduling systems.

4. Code

Developers write application code like the following examples that uses the Schedule resource from the SDK, configure the schedule and implement the application code that will execute.

SDK Reference by language -

Operations will use or extend the Nitric Terraform reference modules:

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Last updated on Feb 7, 2025