114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"os/exec"
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"strconv"
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"text/tabwriter"
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)
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import (
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"mailq-inspector/parser"
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)
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var settings = make(map[string]string)
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func main() {
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parseArguments()
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if settings["interactive"] == "false" {
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showQueue()
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}
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if settings["interactive"] == "true" {
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interactiveShell()
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}
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fmt.Printf("I am done.\n")
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}
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func parseArguments() {
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mailqCommandPtr := flag.String("mailqCommand", "mailq", "Command to use for getting mailq output")
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mailqCommandArgsPtr := flag.String("mailqCommandArgs", "", "Optional arguments to pass to mailqCommand")
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interactivePtr := flag.Bool("interactive", false, "Set to true for shell mode")
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flag.Parse()
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settings["mailqCommand"] = *mailqCommandPtr
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settings["mailqCommandArgs"] = *mailqCommandArgsPtr
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settings["interactive"] = strconv.FormatBool(*interactivePtr)
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}
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func interactiveShell() {
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}
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func showQueue() {
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entries, err := fetchQueueEntries()
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if err != nil {
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fmt.Printf("Could not fetch queue entries: %s\n", err.Error())
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os.Exit(1)
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}
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pagerReader, pagerWriter := io.Pipe()
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pagerDone := make(chan bool)
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go launchPager(pagerReader, pagerDone)
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printQueueEntries(entries, pagerWriter)
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pagerWriter.Close()
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// Wait for pager to be closed before continuing the main program
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<-pagerDone
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}
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func fetchQueueEntries() ([]parser.QEntry, error) {
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var entries []parser.QEntry
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var err error
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if settings["mailqCommandArgs"] == "" {
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entries, err = readFromCmd(exec.Command(settings["mailqCommand"]))
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} else {
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entries, err = readFromCmd(exec.Command(settings["mailqCommand"], settings["mailqCommandArgs"]))
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}
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return entries, err
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}
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func printQueueEntries(entries []parser.QEntry, writer io.Writer) {
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tabWriter := tabwriter.NewWriter(writer, 2, 2, 1, ' ', tabwriter.TabIndent)
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fmt.Fprintf(tabWriter, "| %s\t| %s\t| %s\t| %s\t| %s\t| %s\t| %s\t| %s\t| \n", "Date", "Id", "Status", "Size", "Sender", "#", "First Recipient", "Reason")
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for _, entry := range entries {
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_, writeError := fmt.Fprintf(tabWriter, "| %s\t| %s\t| %s\t| %d\t| %s\t| {%d}\t| %s\t| %s\t \n", entry.Date.Format(parser.SortableDateFormat), entry.Id, entry.Status, entry.Size, entry.Sender, len(entry.Recipients), entry.Recipients[0], entry.Reason)
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if writeError != nil {
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// A writeError is expected once the reader was closed
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// This happens when the pager application got terminated
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fmt.Printf("Error writing!: %s\n", writeError.Error())
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break
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}
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}
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tabWriter.Flush()
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}
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func launchPager(reader *io.PipeReader, pagerDone chan<- bool) {
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cmd := exec.Command("less", "--chop-long-lines")
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cmd.Stdin = reader
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cmd.Stdout = os.Stdout
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if err := cmd.Start(); err != nil {
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fmt.Printf("Error launching pager: %s\n", err.Error())
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}
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if err := cmd.Wait(); err != nil {
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fmt.Printf("Error terminating pager: %s\n", err.Error())
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} else {
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reader.Close()
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pagerDone <- true
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}
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}
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func readFromCmd(cmd *exec.Cmd) ([]parser.QEntry, error) {
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, err
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}
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if err := cmd.Start(); err != nil {
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return nil, err
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}
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result, resultError := parser.ParseMailQ(stdout)
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if err := cmd.Wait(); err != nil {
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return nil, err
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}
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return result, resultError
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}
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