87 lines
3.1 KiB
Go
87 lines
3.1 KiB
Go
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package parser
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import (
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"bufio"
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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type Entry struct {
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id string
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status string
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date time.Time
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size int
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sender string
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recipients []string
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reason string
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}
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func (m Entry) String() string {
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return fmt.Sprintf("ID: %s, Status: %s, Size: %d bytes, Sender: %s, Recipients: %d", m.id, m.status, m.size, m.sender, len(m.recipients))
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}
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func ParseMailQ(scanner *bufio.Scanner) ([]Entry, error) {
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const dateFormat = "2006 Mon Jan _2 15:04:05"
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var messageIdStart = regexp.MustCompile("^[0-9A-Za-z]+[*!]? ")
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scanner.Scan()
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line := scanner.Text()
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if strings.HasPrefix(line, "Mail queue is empty") {
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// If mail queue is empty, there is nothing to do
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return nil, errors.New(line)
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} else if strings.HasPrefix(line, "-Queue ID-") == false {
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// Abort if input does not look like output from mailq(1)
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return nil, errors.New("Sorry, this does not look like output from mailq(1).")
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}
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var currentMail Entry
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var queueEntries []Entry
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for scanner.Scan() {
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// Read input line by line
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line := scanner.Text()
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fields := strings.Fields(line)
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if strings.HasPrefix(line, "--") {
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// Handle the summary line at the end of mailq output
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break
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} else if messageIdStart.MatchString(line) {
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// Handle line starting next mail in queue
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messageId := fields[0]
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if strings.HasSuffix(messageId, "*") {
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currentMail.status = "active"
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} else if strings.HasSuffix(messageId, "!") {
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currentMail.status = "hold"
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} else {
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currentMail.status = "deferred"
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}
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dateString := strconv.Itoa(time.Now().Year()) + " " + strings.Join(fields[2:6], " ")
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mailDate, _ := time.Parse(dateFormat, dateString)
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currentMail.id = strings.TrimRight(messageId, "*!")
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currentMail.size, _ = strconv.Atoi(fields[1])
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currentMail.date = mailDate
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currentMail.sender = fields[6]
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continue
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} else if strings.HasPrefix(line, "(") && strings.HasSuffix(line, ")") {
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// Handle reason for deferred status (if deferred at all, may be missing)
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currentMail.reason = strings.Trim(strings.TrimSpace(line), "()")
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continue
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} else if len(fields) == 1 {
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// Handle line with one of the mail recipients
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currentMail.recipients = append(currentMail.recipients, fields[0])
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continue
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} else if len(fields) == 0 {
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// If the next line is empty, make sure to push current mail to list
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// and create a new struct for the next mail to process
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queueEntries = append(queueEntries, currentMail)
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currentMail = Entry{}
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}
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}
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if scanner.Err() != nil {
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// If the scanner failed, let our caller know.
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return nil, errors.New("Something went wrong with reading from stdin. Sorry!")
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}
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return queueEntries, nil
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}
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