Read "csv"

main.go

package main

import (
	"bufio"
	"fmt"
	"github.com/davecheney/profile"
	"os"
	"strings"
)

type AggregationKey struct {
	Country    string
	Idcategory string
	Iddevice   string
	Idos       string
	Date       string
}

type Aggregation struct {
	AggregationKey
	Hits  int
	Value float64
}

func main() {
	defer profile.Start(profile.CPUProfile).Stop()
	aggregation := make(map[AggregationKey]*Aggregation)
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		line := string(scanner.Bytes())
		record := strings.Split(strings.TrimSpace(line), "|")

		date := record[0][:10]
		aggregationKey := AggregationKey{
			record[2], record[9], record[12], record[8], date,
		}

		if aggregate, ok := aggregation[aggregationKey]; ok {

			aggregate.Hits++

		} else {
			aggregation[aggregationKey] = &Aggregation{
				aggregationKey,
				0,
				0.0,
			}
		}
	}

	fmt.Printf("Aggregated a total of >>%d<< rows from >><<\n", len(aggregation))
}