Periodic

This example demonstrates defining a custom Lambda Trigger that can periodically trigger Lambdas.

Initial Provisioning

graph LR;

cli --> control_plane;
console --> control_plane;
control_plane <-- tunnel --> agent;

subgraph user_edge[User Edge]
cli[CLI];
console[Console];
end

subgraph cloud[Cloud <small>api.on-prem.net</small>]
control_plane[Control Plane];
end

subgraph device_edge[Device Edge]
agent[Agent];
end

Subsequent Autonomous Edge Operation

graph LR;

agent --> trigger[Lambda Trigger];
trigger --> lambda1;
trigger --> lambda2;
trigger --> lambda3;

subgraph device_edge[Device Edge]
agent;
end

subgraph agent[Agent]
trigger;
lambda1[Lambda 1];
lambda2[Lambda 2];
lambda3[Lambda 3];
end

Define the lambda trigger

$ onprem generate xid
cj7br83erad4ipi8nb4g

# my_periodic_lambda_trigger_type.yaml
id: cj7br83erad4ipi8nb4g
kind: LambdaTriggerType
name: periodic_trigger
description: >
  Periodically trigger lambdas.
runsAtControlPlane: true
runsAtDevices: true
scriptContentType: text/x-lua
script: >
  local socket = require('socket')

  local M = {}

  function M.init(context, params)
  end

  function M.run(context)
    while true do
      local event = {
        timestamp = socket.gettime()
      }
      coroutine.yield(event)
      socket.sleep(0.5) -- seep for 1/2 second
    end
  end

  return M

Upload it to the control plane

$ onprem apply my_periodic_lambda_trigger_type.yaml

It will now show up in the cloud console.

And it will also now show up as one of the trigger choices when editing a Lambda.