main.go

package main

import (
	"encoding/csv"
	"fmt"
	"io/ioutil"
	"os"
	"runtime"
	"strconv"
	"strings"
)

// This directory will be watched for incoming files to fetch.
const watchedDir = "./watch"

func main() {
	// It's really not necessary to assign more CPU cores to this small application
	// but this line gives the application a possibillity to use 4 cores.
	runtime.GOMAXPROCS(4)

	fmt.Println("Waiting for a product to be added.\n" +
		"You can use the \"./watch\" directory to put .csv files with the info about" +
		"the product you want added and I will process it automaticly to the DB.\n\n" +
		"Thanks.\n\n-------------------")
	// Infinite loop (often called while in other languages.)
	for {
		d, _ := os.Open(watchedDir)
		// I'm giving it a negative number to return as many files as it can find
		// if I was to give it a positive number x it would've given me x files.
		files, _ := d.Readdir(-1)
		// A for loop that will lopp through the files found
		for _, fi := range files {
			filePath := watchedDir + "/" + fi.Name()
			// We will open the file
			f, _ := os.Open(filePath)
			// And extract the content from the file before ...
			data, _ := ioutil.ReadAll(f)
			// ... closing the file :)
			f.Close()
			// After we have read and extracted info from the file - we delete it from
			// the watch folder
			os.Remove(filePath)

			// This is how we define a goroutine in Googles Golang (more info in the
			// handin about goroutines).
			go func(data string) {
				reader := csv.NewReader(strings.NewReader(data))
				records, _ := reader.ReadAll()
				for _, r := range records {
					skis := new(Skis)
					skis.Brand = r[0]
					skis.Name = r[1]
					skis.SkiType = r[2]
					skis.Gender = r[3]
					// Parsing a int from a string using the strconv package
					skis.Length, _ = strconv.Atoi(r[4])
					// Parsing a float64 from a string using the strconv package.
					skis.Price, _ = strconv.ParseFloat(r[5], 64)

					fmt.Printf("%v %v\n\tType: %v\n\tGender: %v\n"+
						"\tLength: %vcm\nPrice: £%.2f\n-------------------\n", skis.Brand, skis.Name, skis.SkiType,
						skis.Gender, skis.Length, skis.Price)
				}
			}(string(data))
		}
	}
}

// Skis is the structure of our product. In other languages this could
// be called a object.
type Skis struct {
	Brand   string
	Name    string
	SkiType string
	Gender  string
	Length  int
	Price   float64
}