Read all emails in inbox with go-imap v1

read_inbox_v1.go

package main

import (
	"fmt"
	"log"

	"github.com/emersion/go-imap"
	"github.com/emersion/go-imap/client"
	"github.com/emersion/go-message/mail"
)

func main() {
	ccc, err := client.DialTLS("imappro.zoho.com:993", nil)

	if err := ccc.Login("xxxxxxxxxx", "xxxxxxxxxx"); err != nil {
		fmt.Printf("Failed to login: %v", err)
	} else {
		fmt.Printf("Succesfully logged in...\n")
	}

	mbox, err := ccc.Select("INBOX", false)
	if err != nil {
		log.Fatal(err)
	}


	if mbox.Messages == 0 {
		log.Fatal("No message in mailbox")
	} else {
		fmt.Printf("Total message(s) in inbox: %d\n", mbox.Messages)
	}
	seqSet := new(imap.SeqSet)
	seqSet.AddNum(mbox.Messages)


	var section imap.BodySectionName
	items := []imap.FetchItem{section.FetchItem()}

	messages := make(chan *imap.Message, mbox.Messages)
	go func() {
		if err := ccc.Fetch(seqSet, items, messages); err != nil {
			log.Fatal(err)
		}
	}()

	for elem := range messages {
		if elem == nil {
			log.Fatal("Server didn't returned message")
		}

		r := elem.GetBody(&section)
		if r == nil {
			log.Fatal("Server didn't returned message body")
		}

		mr, err := mail.CreateReader(r)
		if err != nil {
			log.Fatal(err)
		}

		header := mr.Header
		if date, err := header.Date(); err == nil {
			log.Println("Date:", date)
		}
		if from, err := header.AddressList("From"); err == nil {
			log.Println("From:", from)
		}
		if to, err := header.AddressList("To"); err == nil {
			log.Println("To:", to)
		}
		if subject, err := header.Subject(); err == nil {
			log.Println("Subject:", subject)
		}

	}

	if err := ccc.Logout(); err != nil {
		fmt.Printf("Failed to logout: %v\n", err)
	}
}

knapa milih make addNum daripada addRange?
buffer capacity waktu bikin channel ngaruh dimana?

keliatannya addNum dipake untuk nentuin index / sequence dari email yang mau dibaca, dia nerima parameter array int, jadi kalau parameternya cuma value dari "mbox.Messages", cuma index / sequence terakhir aja yang dicari.