Task orchestration, creation and running using NodeJS
npm install wf
If you are building a completely new system composed of many discrete API applications, each of them with a clearly defined area of responsibility, or if you are trying to assemble a collaboration channel between a heterogeneous set of unrelated API applications, you need a means to orchestrate interactions between these applications.
A workflow is effectively an orchestration. It gives you a way to decompose a complex series of operations down to a sequence of discrete tasks within a state machine.
The sequence of tasks is more complex than just a series. Tasks can fail, and so you need to deal with timeouts, retries, "stuck" flows, and so forth.
One way to define a workflow and its tasks is using an arbitrarily-complex language. Or you can keep it simple by making some assumptions:
This package provides a way to define re-usable
workflowsusing JSON and run concrete
parametersbased on such
In order to execute
jobs, at least one
WorkflowRunnermust be up and ready to take jobs. An arbitrary number of
runnerscan be used on any set of hosts; their configuration must match.
WorkflowRunneris provided with the package and can be started with:
testdirectory contains the file
config.json.samplewhich can be used as reference).
You can create
jobseither by using the provided REST API(s), or by embedding this module's API into your own system(s). The former will be easier to get up and running, but you should use the latter when:
The package also provides a binary file to run the
WorkflowAPIusing the same configuration file we pass to our
See demo section below for more details about both approaches.
git clone git://github.com/joyent/node-workflow.git cd node-workflow make all
make allwill setup all the required dependencies, node modules and run
make test. In order to just setup node modules,
make setupis enough.
To run the Workflow API server:
To run a Job Runner:
Note that it's fine to run more than one Runner, either on the same or different machines, so long as they have access to the same storage backend.
In order to run
make prepushbefore every commit, add the following to a file called
#!/bin/sh # Run make prepush before allow commit
If you've made a change that does not affect source code files, but (for example) only docs, you can skip this hook by passing the option
The workflow-example repository contains everything needed to illustrate:
config.json.samplewhich should be renamed to
config.json, and modified to properly match your local environment.
Remember that, in order to process any
workflow-runnerneeds to be initialized pointing to the aforementioned configuration file:
Also, in order to be able to run the API-based example mentioned below, the
workflow-apiHTTP server needs to be up and running too:
Contents for the other files within the workflow-example repository are:
shared-workflow.js. The beginning of the aforementioned files can be useful to understand the differences when trying to create a workflow using these different approaches.
node.js, which does exactly the same thing as the workflow/job does -- create and star a gist using your github's username and password -- but straight from node.js. This file is useful in order to understand the differences between writing code to be executed by node.js directly, and using it to create workflows and the associated tasks. Remember, code within tasks runs sandboxed using Node's VM API and that tasks are totally independent.
example.jsfor more options when defining workflows and the different possibilities for task fallbacks, retries, timeouts, ...
deps/ Git submodules and/or commited 3rd-party deps. See "node_modules/" for node.js deps. docs/ Project docs (restdown) lib/ Source files. node_modules/ Node.js deps, either populated at build time or commited. pkg/ Package lifecycle scripts test/ Test suite (using node-tap) tools/ Miscellaneous dev/upgrade/deployment tools and data. Makefile package.json npm module info README.md
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