Environment variables locally and Heroku

问题

I have a sinatra app in which i have a yml file to set environment variables, i call them using this method

module MyConfig

 def config
  environment = ENV["RACK_ENV"] || "development"
  YAML.load_file("./config/config.yml")[environment]
 end
 end

so when i want to use a variable i do this for example

aws_access_key_id = config['aws_access_key']

I have a .gitignore file that ignores config.yml when pushing to github for example.So when I push to heroku these environment variables will not be accessible?

So this leaves me with using the heroku way of setting them like so

heroku config:add aws_access_key= myapikey

but heroku accesses these like

aws_access_key_id = ENV['aws_access_key']

How can i set my dev environment to use method config and heroku use ENV, am i looking at this the wrong way? or does my config method do this for me?

Any help appreciated

RAKEFILE

  require 'active_support/core_ext'
  require './config/config.rb'
  require 'bundler/setup'
  Bundler.require(:default)

   include MyConfig

  AssetSync.configure do |con|
  con.fog_provider = 'AWS'
  con.fog_region = 'eu-west-1'
  con.fog_directory = config['fog_directory']
  con.aws_access_key_id = config['aws_access_key']
  con.aws_secret_access_key = config['aws_secret_key']
  con.prefix = "assets"
  con.public_path = Pathname("./public")
  end

 namespace :assets do
 desc "Precompile assets"
 task :precompile do
  AssetSync.sync
 end
end

回答1:

Update:

I now use the dotenv gem instead of the example below. So instead of ignoring the env.rb file, I now ignore the .env file with Git.

Original post:

Try this,

# /env.rb

ENV['aws_bucket'] = 'my_bucket'
ENV['aws_access_key'] = 'my_access_key'
ENV['aws_access_secret'] = 'my_access_secret'

This file sets the same ENV values as heroku config would do.

# /config.rb

require './env' if File.exists?('env.rb')

The env.rb will only get required if it exists.

# /.gitignore

/env.rb

The env.rb has been added to the .gitignore file so it isn't kept in Git.

You would then access the values using ENV['key'] instead of config['key'].

You might need to change the path to the env.rb if it's not in the same directory as the config.rb file.

EDIT:

From looking at your Rakefile in the previous question, you need to change it to this:

# Rakefile

require 'bundler/setup'
Bundler.require(:default)
require './env' if File.exists?('env.rb')

AssetSync.configure do |con|
 con.fog_provider = 'AWS'
 con.fog_region = 'eu-west-1'
 con.fog_directory = ENV['aws_bucket']
 con.aws_access_key_id = ENV['aws_access_key']
 con.aws_secret_access_key = ENV['aws_access_secret']
 con.prefix = "assets"
 con.public_path = Pathname("./public")
end

namespace :assets do
  desc "Precompile assets"
  task :precompile do
    AssetSync.sync
  end
end

I've assumed that the only method in /config/config.rb was the config method so I've removed the,

require './config/config.rb'
include MyConfig

And swapped the config[key] for the ENV[key] values defined in env.rb. You may need to change the key names to match up.

回答2:

You could delete the yaml, and describe the environment variables in a .env file then start your app with foreman start. See https://devcenter.heroku.com/articles/config-vars#local-setup

---

Or keep your hybrid system, where you load a yaml in dev, and use environment variables on heroku.

回答3:

I do something similar to Sam's suggestion, but a little bit different. I have a YAML config file too, but I wrap the reading of it in a Rake task, which then runs the app.

# in the Rakefile

require 'yaml'

def set_connstring
  s = %Q!postgres://#{ENV["DB_APP"]}@localhost/#{ENV["DB_APP"]}!
  ENV['DATABASE_URL'] ||= ENV["RACK_ENV"] == "test" ? "#{s}.test" : s
end


def basic_environment
  warn "  Setting up environment..."

  file = File.expand_path( File.join File.dirname(__FILE__), "./config.yml" )
  if File.exist? file
    YAML.load_file(file).each do |k,v|
      warn "-> #{k}"
      ENV[k.upcase] = v
    end
  end

  set_connstring()
end

namespace :app do

  desc "Set up the environment locally"
  task :environment do
    basic_environment()
  end

  desc "Run the app locally"
  task :run_local => "app:environment" do
    exec "bin/rackup config.ru -p #{ENV['RUN_LOCAL_PORT']}"
  end
end

It means I can run it locally without any code inside the app to deal with this.

---

Edit: a quick aside, I notice you have Bundler.require(:default) in your Rakefile. If you use bundle install --binstubs then Bundler installs all executables into a dir named "bin/" within the project. Then, if you run any of those executables they automatically use the libraries installed by Bundler, no need to require via Bundler. See http://gembundler.com/v1.2/man/bundle-exec.1.html.

回答4:

Exporting directly from heroku admin: Settings -> Reveal Config Vars

Then open browser js console, paste this and type enter...

k=[];
$(".config-var-list input").map(function(y, x){k.push($(x).val())});
v=[];
$(".config-var-list textarea").map(function(y, x){v.push($(x).val())});
ret="";
k.map(function(x, i){ret+=k[i]+"\t"+v[2*i]+"\n"});
console.info(ret);

来源：https://stackoverflow.com/questions/15466627/environment-variables-locally-and-heroku