108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
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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"io"
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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 QEntry 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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const SortableDateFormat = "2006-01-02 15:04:05"
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func (m QEntry) ShortString() string {
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return fmt.Sprintf("[%s] %s <%s> -> %d recipients (%d bytes)", m.Date.Format(SortableDateFormat), m.Id, m.Sender, len(m.Recipients), m.Size)
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}
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func (m QEntry) String() string {
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var recipientSuffix string
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if len(m.Recipients) > 1 {
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recipientSuffix = ",..."
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}
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return fmt.Sprintf("[%s] %s <%s> -> {%d}<%s>%s (%s, %d bytes)", m.Date.Format(SortableDateFormat), m.Id, m.Sender, len(m.Recipients), m.Recipients[0], recipientSuffix, m.Status, m.Size)
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}
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func (m QEntry) DetailedString() string {
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var reasonStr string
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if m.Reason == "" {
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reasonStr = "-/-"
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}
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return fmt.Sprintf("Id: %s\nDate: %s\nStatus: %s\nReason: %s\nSize: %d\nSender: %s\nRecipients: %s", m.Id, m.Date.Format(SortableDateFormat), m.Status, reasonStr, m.Size, m.Sender, strings.Join(m.Recipients, ", "))
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}
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func ParseMailQ(dataSource io.Reader) ([]QEntry, 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 := bufio.NewScanner(dataSource)
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var line string
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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 []QEntry{}, nil
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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 QEntry
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var queueEntries []QEntry
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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 = QEntry{}
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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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