@twilson63/palmetto-couchdb

palmetto couchdb adapter

An adapter to use couchdb as the append only log in palmetto flow

Usage

The palmetto flow adapter allows both the client and service to keep their code abstracted to the the pub/sub implementation so that the pub/sub implementations can be swapped out and not affect the service or client, they both have to to point to the same pub/sub service inorder to work, but this gives great flexibility in changing out components or parts of the application with different technologies.

Client Example:

var palmetto = require('palmetto-couchdb')
var ee = palmetto({
  endpoint: 'http://localhost:5984',
  app: 'app_log'
})

app.get('/foo', function (req, res) {
  ee.once('1234', function (e) {
    // handle response
    res.writeHead(200, { 'content-type': 'application/json'})
    res.end(e.object)
  })  
  ee.emit('send', {
    to: '/domain/service/action',
    from: '1234',
    subject: 'service',
    verb: 'action',
    object: req.params,
    dateSubmitted: moment().utc().format()
  })
})

Service Example:

// container

require('health-server')
var palmetto = require('palmetto-couchdb')
var ee = palmetto({
  endpoint: 'http://localhost:5984',
  app: 'app_log'
})

svc(ee)

// service

module.exports = function (ee) {
  ee.on('/domain/service/action', function (e) {
    // validate e.object using json-schema
    // do serivce stuff
    ee.emit('send', {
      to: e.from,
      from: '/domain/service/action',
      subject: e.subject + '-response',
      verb: e.verb + '-response',
      object: result,
      ...
    })
  })
}

[see tests]

## Test

npm test

More docs coming soon.