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Go Programming Blueprints

You're reading from  Go Programming Blueprints

Product type Book
Published in Jan 2015
Publisher Packt
ISBN-13 9781783988020
Pages 274 pages
Edition 1st Edition
Languages
Author (1):
Mat Ryer Mat Ryer
Profile icon Mat Ryer
Toc

Table of Contents (17) Chapters close

Go Programming Blueprints
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
1. Chat Application with Web Sockets 2. Adding Authentication 3. Three Ways to Implement Profile Pictures 4. Command-line Tools to Find Domain Names 5. Building Distributed Systems and Working with Flexible Data 6. Exposing Data and Functionality through a RESTful Data Web Service API 7. Random Recommendations Web Service 8. Filesystem Backup Good Practices for a Stable Go Environment Index

Counting votes


The second program we are going to implement is the counter tool, which will be responsible for watching out for votes in NSQ, counting them, and keeping MongoDB up to date with the latest numbers.

Create a new folder called counter alongside twittervotes, and add the following code to a new main.go file:

package main
import (
  "flag"
  "fmt"
  "os"
)
var fatalErr error
func fatal(e error) {
  fmt.Println(e)
  flag.PrintDefaults()
  fatalErr = e
}
func main() {
  defer func() {
    if fatalErr != nil {
      os.Exit(1)
    }
  }()
}

Normally when we encounter an error in our code, we use a call like log.Fatal or os.Exit, which immediately terminates the program. Exiting the program with a non-zero exit code is important, because it is our way of telling the operating system that something went wrong, and we didn't complete our task successfully. The problem with the normal approach is that any deferred functions we have scheduled (and therefore any tear down code we need to...

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