110 lines
2.4 KiB
Go
110 lines
2.4 KiB
Go
package main
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import (
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"bufio"
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"flag"
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"fmt"
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"log"
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"os"
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"os/exec"
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"strings"
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"time"
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)
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// Executes a command and channel-send its stdout
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func cmdStdout(commandline []string) chan string {
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lines := make(chan string)
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go func() {
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cmd := exec.Command(commandline[0], commandline[1:]...)
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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log.Fatal("couldn't open stdout on command:", err)
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}
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if err := cmd.Start(); err != nil {
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log.Fatal("couldn't start command:", err)
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}
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defer stdout.Close()
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scanner := bufio.NewScanner(stdout)
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for scanner.Scan() {
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lines <- scanner.Text()
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}
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close(lines)
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}()
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return lines
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}
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// Whether one of the filter's regexes is matched on a line
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func (f *Filter) match(line string) string {
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for _, regex := range f.compiledRegex {
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if matches := regex.FindStringSubmatch(line); matches != nil {
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match := matches[regex.SubexpIndex(f.patternName)]
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log.Printf("INFO %s.%s: match `%v`\n", f.stream.name, f.name, match)
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return match
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}
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}
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return ""
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}
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func (f *Filter) execActions(match string) {
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pattern := fmt.Sprintf("<%s>", f.patternName)
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for _, a := range f.Actions {
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go a.exec(match, pattern)
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}
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}
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func (a *Action) exec(match, pattern string) {
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if a.afterDuration != 0 {
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time.Sleep(a.afterDuration)
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}
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computedCommand := make([]string, 0, len(a.Cmd))
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for _, item := range a.Cmd {
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computedCommand = append(computedCommand, strings.ReplaceAll(item, pattern, match))
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}
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log.Printf("INFO %s.%s.%s: run %s\n", a.filter.stream.name, a.filter.name, a.name, computedCommand)
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cmd := exec.Command(computedCommand[0], computedCommand[1:]...)
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if ret := cmd.Run(); ret != nil {
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log.Printf("ERR %s.%s.%s: run %s, code %s\n", a.filter.stream.name, a.filter.name, a.name, computedCommand, ret)
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}
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}
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func (s *Stream) handle() {
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log.Printf("INFO %s: start %s\n", s.name, s.Cmd)
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lines := cmdStdout(s.Cmd)
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for line := range lines {
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for _, filter := range s.Filters {
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if match := filter.match(line); match != "" {
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filter.execActions(match)
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}
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}
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}
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}
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func main() {
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confFilename := flag.String("c", "", "configuration file. see an example at https://framagit.org/ppom/reaction/-/blob/main/reaction.yml")
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flag.Parse()
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if *confFilename == "" {
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flag.PrintDefaults()
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os.Exit(2)
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}
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conf := parseConf(*confFilename)
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for _, stream := range conf.Streams {
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go stream.handle()
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}
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// Infinite wait
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<-make(chan bool)
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}
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