Introduction
I am very excited about the Beego web framework. I wanted to share with you how I use the framework to build real world web sites and web services. Here is a picture of the sample website the post is going to showcase:
The sample web application:
Implements a traditional grid view of data calling into MongoDB Provides a modal dialog box to view details using a partial view to generate the HTML Implements a web service that returns a JSON document Takes configuration parameters from the environment using envconfig Implements tests via goconvey Leverages my logging package The code for the sample can be found in the GoingGo repository up on Github:
Continue readingAt Ardan Studios we have spent the last 6 months, in our spare time and on weekends, building a consumer based mobile application called OutCast. The mobile application is tailored towards those who like spending time outdoors, whether that be fishing, hunting or any other type of activity.
This first release of OutCast shows the conditions for the buoy stations and marine forecasts areas within the United States. All this information is updated every 10 minutes and there are map views with traditional grids and search.
Continue readingThis is a guest post from Tad Vizbaras from Etasoft in South Florida. There are a number of editors and IDEs for Go development. LiteIde, Vim, Emacs and GEdit just to name a few. Each developer has their own favorite editor for each language they work with. Some like full featured IDE environments while others prefer speed over features. My personal favorite editors for Go development at the moment are Vim and GEdit.
Continue readingHave you ever found yourself in this situation. You have a case statement inside of a for loop and you would like to break from both the case and for statements in a single call?
var err error
timeout := time.After(30 * time.Second)
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
complete := make(chan error)
go launchProcessor(complete)
for {
select {
case <-sigChan:
atomic.StoreInt32(&shutdownFlag, 1)
Continue readingLinux is unique to Windows in many ways, and writing programs in Linux is no exception. The use of standard out, standard err and null devices is not only a good idea but it’s the law. If your programs are going to be logging information, it is best to follow the destination conventions. This way your programs will work with all of the Mac/Linux tooling and hosted environments.
Go has a package in the standard library called log and a type called logger.
Continue readingI am working on a project that requires pulling and processing different XML feeds from the web and storing the data into MongoDB as JSON. Since new feeds come up everyday, changing the Go program to process and publish new feeds is out of the question. A second constraint is that processing has to work in Iron.io or any other linux cloud based environment.
What I needed was a Go program that could take an XML document and XSLT stylesheet at runtime, transform the XML into JSON and then store the JSON to MongoDB.
Continue readingIntroduction If you are using 3rd party packages, (packages that you don't own or control), you will want a way to create a reproducible build every time you build your projects. If you use 3rd party packages directly and the package authors change things, your projects could break. Even if things don't break, code changes could create inconsistent behavior and bugs.
Keith Rarick's tool godep is a great step in the right direction for managing 3rd party dependencies and creating reproducible builds.
Continue readingI was testing new functionality on a program that is already running in production when suddenly the code behaved very badly. What I saw shocked me and then it became obvious why it happened. I also have a race condition just waiting to be a problem.
I have tried to provide a simplified version of the code and the two bugs.
package main
import (
"fmt"
"os"
Continue readingIn Go values that are returned from functions are passed by value. Go gives you some nice flexibility when it comes to returning values from a function.
Here is a simple example of returning two values from a function:
package main
import (
"fmt"
)
func main() {
id, err := ReturnId()
if err != nil {
fmt.Printf("ERROR: %s", err)
return
}
Continue readingIntroduction
In my post about building and running programs in Iron.Io, I needed to switched over to my Ubuntu VM to build linux versions of my test programs locally. I love the ability to have Ubuntu available to me for building and testing my code. However, if I can stay on the Mac side it is better.
I have wanted to learn how to cross compile my Go programs for the two platforms I use, darwin/amd64 and linux/amd64.
Continue reading