#GAE Environment Variable Library#
Available under the MIT (Expat) License - see bottom of README.
A simpler way of thinking about programming environments when working with `appengine.Context' AppIDs (or Project IDs) on Google's Cloud Platform, GAE
So, instead of
func SomeHandler(c appengine.Context, w http.ResponseWriter, r *http.Request) {
if appengine.AppID(c) == "rockpool-production" {
//do this
} else if appengine.AppID(c) == "rockpool-staging" {
//do that
}
you can do this
func SomeHandler(c appengine.Context, w http.ResponseWriter, r *http.Request) {
if env.Is("production") {
//do this
} else env.Is("staging") {
//do that
}
As well as being cleaner, it means you can meaningfully refer to environments in your code without having to hardcode the name of the Google Cloud Project.
You may then access environment specific variables with env.Get(c, appengine.Context, key string) or env.GetOk(c, appengine.Context, key string):
func SomeHandler(c appengine.Context, w http.ResponseWriter, r *http.Request) {
db_password := env.Get(c, "db_password").(string)
//or, use the GetOk pattern
db_password2, ok := env.GetOk(c, "db_password")
}
{
"mappings" : {
"production" : "rockpool-production",
"staging" : "rockpool-staging",
"test" : "rockpool-test"
},
"default" : {
"question" : "How about a nice game of chess?",
},
"production" : {
"message" : "I am a production Msg",
"tolerance" : 0.12,
"acceptableRank" : ["2","3","4"]
},
"staging" : {
"message" : "I am a staging Msg",
"tolerance" : 0.13,
"acceptableRank" : ["5","6","7"]
"question" : "How about a nice game of chess (in staging)?",
}
Default variables mean that every environment will gain this value, unless you choose to override it within the environment's stanza.
In the example configuration above, production will have a question with "How about a nice game of chess?" as its value but staging will have "How about a nice game of chess (in staging)?".
Typically setup is down within a init function called early in the lifecycle of one of your packages.
Use MustLoad to create a runtime panic if the JSON config cannot be loaded.
Use Load to return an error to handle yourself if the JSON config cannot be loaded.
func init() {
env.MustLoad("./environment.json")
// or ...
err := env.Load("./environment.json")
if err != nil {
...
}
}
goapp get github.com/rockpoollabs/env
Also see Configuration below.
http://godoc.org/github.com/rockpoollabs/env
You will need to be setup with google app engine and goapp. See the google app engine documentation for details
Dependencies are installed via:
make depsmake test
make live-test //then browse to http://localhost:8080/make fmtEnsure that you are running Goapp. This was developed on goapp 1.9.15 but should work with earlier versions supporting appengine.AppId.
goapp version
go version go1.2.1 (appengine-1.9.15) darwin/amd64
You're welcome to make a Pull Request; please include tests for anything you want to contribute.
The MIT License (MIT)
Copyright (c) 2014 Rockpool Labs
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.