pyro v0.1.26

Overview

pyro provides a high level dsl for interacting with a Firebase datastore.

All pyro calls return promises.

How to use

pyro uses two environment variables: FIREBASE_ROOT and FIREBASE_KEY. FIREBASE_ROOT is required. FIREBASE_KEY is only required for Firesbases with security rules.

get

get is how you read data. You pass it the location to the data you want and it returns a promise. The promise resolves with the value at the location you specified.

Below is an example:

NOTE The FIREBASE_ROOT and FIREBASE_KEY variables are set before we call require

  var pyro = require('pyro')

  pyro.
    get('users/barney/friends/fred').
    then(function (value) {
      // Value is whatever data is stored at the /users/barney/friends/fred location
    })

set

set is how you insert and overwrite data. set assigns the value passed to the location specified. It returns a promise that is resolved true when the value has been set. The location's priority is set using the priority method.

Below is an example:

  var pyro = require('pyro')

  pyro.
    set('questions/life the universe and everything', { answer: 42 }).
    then(function (success) {
      if (success)
        do('...') // Ummm, I don't know, actually...
    })

add

add has the following behaviors:

1. It only adds a value if one does not already exist at the specified location.
2. It maintains a count property alongisde added values. add assumes it is operating on a list. count provides an easy way to know how many items exist in the list being added to.

Below is an example:

  var pyro = require('pyro')

  pyro.
    add('users/fred/friends/barney', { years_known: 42 }).
    then(function (added) {
      if (added)
        console.log('Recorded friend')
      else
        console.log('Friend already recorded, nothing to do')
    })

The result of this call (assuming it's the first of fred's friends we've added) would be:

/users/fred/friends/barney/{ years_known: 42 }
                   /count/1

The following call:

  var pyro = require('pyro')

  pyro.
    add('users/fred/friends/shemp', { years_known: -650000000 }).
    then(function (added) {
      if (added)
        console.log('Recorded friend')
      else
        console.log('Friend already recorded, nothing to do')
    })

Would result in the following:

/users/fred/friends/barney/{ years_known: 42 }
                   /shemp/{ years_known: -650000000 }
                   /count/2

priority

priority is used internally to set a location's priority. The default behavior is to return the value of Date.now(). If you need different behavior simply override this method with a function that returns an appropriate value.

priority's signature is:

  function priority(location, value) {
    return // Value that can be used for sorting/searching
  }

The location parameter is the location being prioritized.

The value parameter is the value assigned to the location specified. touch does not pass this parameter.

touch

touch is how you modify a location's priority. The location's priority is set using the priority method.

touch passes the path it's working on to priority, but does not pass a value.

  var pyro = require('pyro')

  pyro.
    touch('users/fred/friends/barney').
    then(function (updated) {
      if (updated)
        celebrate()
    }).
    fail(function (err) {
      console.log(err)
    })

increment_count

increment_count increments the count property for the specified location.

It first gets the current count (initializing it to 0 if it doesn't exist) and then updates the count, incrementing it by one.

increment_count also sets a priority for the count using the priority method.

TODOS

1. Add a scope property. This would be prepended to all locations so common location elements don't need to be repeated.