feat: scheduling jobs

[AlessioGr]

Adds a new schedule property to workflow and task configs that can be used to have Payload automatically queue jobs following a certain schedule.

Todo

• Testing
• Docs
• cron scheduler mode
• Investigate: jobs autoRun does not work after HMR runs?
• Address defaultBeforeSchedule todo: tag jobs created by auto scheduling, and only use those for the filter

API Example

export default buildConfig({
  // ...
  jobs: {
    // ...
    scheduler: 'manual', // Or `cron` if you're not using serverless. If `manual` is used, then user needs to set up running /api/payload-jobs/handleSchedules or payload.jobs.handleSchedules in regular intervals
    tasks: [
      {
        schedule: [
          {
            cron: '* * * * * *',
            queue: 'autorunSecond',
            // Hooks are optional
            hooks: {
              // Not an array, as providing and calling `defaultBeforeSchedule` would be more error-prone if this was an array
              beforeSchedule: async (args) => {
                // Handles verifying that there are no jobs already scheduled or processing.
                // You can override this behavior by not calling defaultBeforeSchedule, e.g. if you wanted
                // to allow a maximum of 3 scheduled jobs in the queue instead of 1, or add any additional conditions
                const result = await args.defaultBeforeSchedule(args)
                return {
                  ...result,
                  input: {
                    message: 'This task runs every second',
                  },
                }
              },
              afterSchedule: async (args) => {
                await args.defaultAfterSchedule(args) // Handles updating the payload-jobs-stats global
                args.req.payload.logger.info(
                  'EverySecond task scheduled: ' +
                  (args.status === 'success' ? args.job.id : 'skipped or failed to schedule'),
                )
              },
            },
          },
        ],
        slug: 'EverySecond',
        inputSchema: [
          {
            name: 'message',
            type: 'text',
            required: true,
          },
        ],
        handler: ({ input, req }) => {
          req.payload.logger.info(input.message)
          return {
            output: {},
          }
        },
      }
    ]
  }
})

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