Web store order processor: multiple work items example

This robot splits orders by customer from an incoming Excel file. The orders are then handled individually and in parallel. It includes a second version of the consumer task which produces errors, which can be used to demonstrate how the Control Room receives errors from bots.

The robot demonstrates the Work Items feature of Robocorp Control Room:

• Triggering a process with custom payloads (input)
• Passing data and files between process steps
• Parallel execution of steps
• Robot and Control Room exception handling

We recommended checking out the article "Using work items" before diving in.

Tasks

The robot is split into two tasks, meant to run as separate steps. The first task generates (produces) data, and the second one reads (consumes) and processes that data. A bonus task exists which can be used to mock Control Room and Robot error handling.

Producer-consumer, Wikipedia.

The first task (the producer)

• Reads an Excel file from the work item
• Splits it into orders by customer
• Creates a new work item for each order

The second task (the consumer)

• Logs in to the web store
• Reads the products in the order from the work item
  • Loops through work items to avoid time spent logging in per each work item.
• Orders the products

The bonus task (error mocking)

• Produces errors during the same actions as the consumer.
  • Some error will be retried by the bot internally.
  • Some errors will cause the run to fail after work items are already released (therefore the work item will still complete).
  • Some errors will be reported at the Control Room level with appropriate codes and messages.
• You can automatically retry errors with the Retry Bot in the Portal.

Excel input file

The first task expects an Excel file in a specific format:

Name	Item	Zip
Sol Heaton	Sauce Labs Bolt T-Shirt	3695
Gregg Arroyo	Sauce Labs Onesie	4418
Zoya Roche	Sauce Labs Bolt T-Shirt	3013
Gregg Arroyo	Sauce Labs Bolt T-Shirt	4418
Camden Martin	Sauce Labs Bolt T-Shirt	1196
Zoya Roche	Sauce Labs Fleece Jacket	3013
Zoya Roche	Sauce Labs Onesie	3013
Sol Heaton	Sauce Labs Fleece Jacket	3695
Sol Heaton	Sauce Labs Onesee	3695

But, you can run this as a demo by supplying no item to the Control Room. The robot will use the default input used in testing and linked above.

Local development

When running in Control Room, the work items will be automatically managed and passed between steps in the process. However, when running locally, the work items can be simulated using folder structure and JSON files.

VsCode

Robocorp VsCode extensions has built-in support making the use and testing of work items more straightforward.

Using VsCode, you should only need this guide

RCC from CLI

As each task in the robot expects different work item input, we need a way to control this.

This example includes test inputs, one for each task in the process:

• For task Split orders file:
  • ./devdata/work-items-in/split-orders-file-test-input/work-items.json
• For task Load and Process All Orders:
  • ./devdata/work-items-in/process-orders-test-from-outputs/work-items.json

To run specific tasks with specific inputs in the command-line you can run the following commands:

• Run Split orders file with test input:
  • rcc task run -t "Split orders file" -e ./devdata/env-split-orders.json
• Run Load and Process All Orders with test input:
  • rcc task run -t "Load and Process All Orders" -e ./devdata/env-process-orders.json

Control room setup

To see how to set up Control Room and understand more about how work items are used, see the following article: Using work items.