worksmith

worksmith

A seriously functional workflow library, that lets you build composable and configurable process definitions for various reasons.

npm i worksmith --save

For a step by step tutorial click here

Release notes

##Worksmith activities / task types

Worksmith comes with an extensible task library built up from the core and the extension modules.

Core activities

group	activities	description

• Control flow: sequence , parallel and warezSequence
• IO: log,sql/pg
• Tansformation: map, regex, set
• Extensibitly: code activity , create custom task types by creating files in the tasks folder

Extension modules

name	description
worksmith_salesforce	Interact with salesforce in a workflow
worksmith_etcd	Use network based locking via etcd service
coming	soon
worksmith_postgres	Execute SQL statements as part of the workflow, supports transactions
worksmith_assert	An assertion library to be used conventional workflows or workflows built for testing
worksmith_fs	Read/write files from a workflow

• with worksmith you can build a complex async process chain from functional steps (tasks) - yet keep the application easy to understand and each functional step easy to developer and maintain. forget if(err) return next(err)
• workflow steps are unaware about each other - they communicate over a shared context. WorkSmith provides an intuitive expression syntax for working with the context in a workflow definitions

usage

A workflow definition:

This can be in a config file, or as part of your js code as a variable.

{ "task": "sequence",
  "items": [
        {
            task:"log", message:"hello workflow"
        },
        {
            task: "map",
            ">insertParams": ["@req.params.id", 1, 1]
        },
        {
            task:"sql/pg",
            connection: "@connection",
            command:  "insert into order (order_id, version, type) \
                       values ($1, $2, $3) returning id",
            params:  "@insertParams",
            resultTo: "insertResult"
        },
        {...}
  ]
}

The code:

var worksmith = require('worksmith')

var workflow = worksmith('./workflow.json')


var context = {
    connection:"postgres://login:pw@host/db",
    other:"data"
}

workflow(context, function(err, result) {
    console.log("workflow completed, %", context.insertResult)
})

How to create your own activity

worksmith lets you build your activities on a super easy way Place the following code as "hello-world.js" in the tasks folder

var utils = require('worksmith')
module.exports = function (node) {
    //use the node variable to access workflow params
    return function(context) {
    //use the context to access workflow execution state
        return function(done) {
        //set done when your acitivity finished its job
        //read and write data from the context
            console.log("Hello world", context.get(node.inParam))
            context.set("myresult","myvalue")
            done();
        }
    }

}

Now you can use it the same way as the core activities

var wf = workflow( {"task":"hello-world", "inParam":"some thing"} );

var ctx = {"some":"value"};
wf(ctx, function(err) {
    console.log(ctx)
})

List of core activities

log

Write a log to the console

options

message

delay

Waits a bit

options

duration

insertDbRecord

Like the name suggests

options

table data connection resultTo

softDeleteDbRecord

deleteDbRecord

parallel

Execute sub tasks in parallel

options

items array

sequence

Execute sub tasks in sequence

options

items array

warezSequence

Define a sequence on a patching compatible way

options

items array

set

Set variable on the workflow context

options

name value