Usage examples for node-workflow.
Pre-requirements:
These examples can run using any of the supported backend modules for wf.
Example files are provided for these modules.
If you want to run the example using Redis, you need:
- Working Redis Server. (Version 2.4.+).
- Use
config.redis.jsonas your configuration file when running the services. - Copy the file
package-redis.jsontopackage.json.
If you want to use PostgreSQL:
- Working PostgreSQL 9+ server.
- Use
config.pg.jsonas your configuration file when running the services. - Copy the file
package-pg.jsontopackage.json.
git clone git://github.com/kusor/node-workflow-example.git
cd node-workflow-example
make all
Note make all will setup all the required dependencies, node modules and run
make check. In order to just setup node modules, make setup is enough.
To run the Workflow API server:
./node_modules/.bin/workflow-api config.json 2>&1 | ./node_modules/.bin/bunyan
To run a Job Runner:
./node_modules/.bin/workflow-runner config.json 2>&1 | ./node_modules/.bin/bunyan
Note that it's perfectly fine to run more than one Runner, either on the same or different machines, as far as they have access to Redis Server.
This repository contains everything needed to illustrate:
- An example config file which should be modified to properly match your local environment.
Remember that, in order to process any job the workflow-runner needs
to be initialized pointing to the aforementioned configuration file:
./node_modules/.bin/workflow-runner config.json 2>&1 | ./node_modules/.bin/bunyan
Also, in order to be able to run the API based example mentioned below, the
workflow-api HTTP server needs to be up and running too:
./node_modules/.bin/workflow-api config.json 2>&1 | ./node_modules/.bin/bunyan
Contents for the other files are:
- An example of how to use node-workflow as a node module in order to create
workflows, queue jobs and wait for the results. See
module.js. - Also, an example of how to achieve same goal using Workflow API instead of
the node module. See
api.js. - Both examples share the same workflow definition, contained at the file
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. - Finally, this directory also contains a file
node.jswhich does exactly the same thing than the workflow/job does - create and star a gist using your github's username and password - but straight from NodeJS. This file is useful in order to understand the differences between writing code to be executed by NodeJS directly, and using it to create workflows and the associated tasks. Remember code withing tasks runs sandboxed using Node's VM API and that tasks are totally independent, and run each one on its own child process.
The MIT License (MIT) Copyright (c) 2014 Pedro Palazón Candel
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