Go parsing XML file - go

Question

i would like to parse a xml file and print values.
<alerts time="2017-09-14T15:46:00+02:00">
<alert type="A" identifier="123" declaredBy="Bob" />
<startedAt>20171010212210</startedAt>
<lastUpdate bySource="X">
<updatedAt>20171010213655</updatedAt>
<eventConfirmation>unconfirmed</eventConfirmation>
<additional>
<data name="numberOfOccurences">1</data>
</additional>
</lastUpdate>
<labels>
<label language="FR">attaque DNS</Label>
</labels>
</alert>
</alerts>
in this example i have just one alert but i can have more. I wrote 2 packages
package alerts
import "encoding/xml"
// Alert structure
type Alerts struct {
XMLName xml.Name `xml:"alerts"`
Time string `xml:"time,attr"`
Alert []alert `xml:"alert"`
}
type lastUpdate struct {
XMLName xml.Name `xml:"lastUpdate"`
BySource string `xml:"bySource,attr"`
UpdatedAt string `xml:"updatedAt"`
EventConfirmation string `xml:"eventConfirmation"`
Additional additional `xml:"additional"`
}
type additional struct {
XMLName xml.Name `xml:"additional"`
Data data `xml:"data"`
}
type data struct {
XMLName xml.Name `xml:"data"`
NumberOfOccurences int `xml:"numberOfOccurences,attr"`
}
type labels struct {
XMLName xml.Name `xml:"labels"`
Label []label `xml:"label"`
}
type label struct {
XMLName xml.Name `xml:"label"`
Label string `xml:"label"`
LabelLanguage string `xml:"language,attr"`
}
type alert struct {
XMLName xml.Name `xml:"alert"`
Type string `xml:"type,attr"`
Identifier string `xml:"identifier,attr"`
DeclaredBy string `xml:"declaredBy,attr"`
StartedAt string `xml:"startedAt"`
Lastupdate lastUpdate `xml:"lastupdate"`
Labels labels `xml:"label"`
}
my second package
package main
import (
"encoding/xml"
"fmt"
"io/ioutil"
"os"
"github.com/user/xmlparser/alert"
"github.com/golang/glog"
)
func main() {
//open XML file given in argument
xmlfile, err := os.Open(os.Args[1])
if err != nil {
glog.Fatalf("opening file %s - error : %s", os.Args[1], err)
}
defer xmlfile.Close()
// read our opened xmlFile as a byte array.
byteValue, _ := ioutil.ReadAll(xmlfile)
// we initialize our alerts array
var al alerts.Alerts
// we unmarshal our byteArray which contains our
// xmlFiles content into 'al' which we defined above
xml.Unmarshal(byteValue, &al)
for i := 0; i < len(al.Alert); i++ {
fmt.Printf("Alert time : %s\n\n", al.Time)
fmt.Println("Type: " + al.Alert[i].Type)
fmt.Println("Identifier: " + al.Alert[i].Identifier)
fmt.Println("declaredBy: " + al.Alert[i].DeclaredBy)
fmt.Printf("startAt: %s\n", al.Alert[i].StartedAt)
}
}
I can print Time, Type, Identifier and DeclaredBy but the variable StartedAt is empty. There is something that i don't understand. I think that my structure is not correctly defined.
If someone can help me ... Thanks !!!

Answer 1

It looks like you need to define StartedAt as more than just a string. Take a look at this question and example. You need to define StartedAt as it's own struct so you can access it's innerxml string.
type StartedAt struct {
Raw string `xml:",innerxml"`
}
type alert struct {
XMLName xml.Name `xml:"alert"`
Type string `xml:"type,attr"`
Identifier string `xml:"identifier,attr"`
DeclaredBy string `xml:"declaredBy,attr"`
StartedAt StartedAt `xml:"startedAt"`
}