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package cgi
import (
"context"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/http/cgi"
"os"
"sync"
"time"
"git.capotej.com/capotej/communique/config"
"github.com/dgraph-io/badger/v3"
"go.uber.org/zap"
)
type Servers struct {
log *zap.SugaredLogger
db *badger.DB
}
func NewServers(log *zap.SugaredLogger, db *badger.DB) *Servers {
return &Servers{log: log, db: db}
}
// Start iterates over all Handlers and starts an internal CGI server for each one
// along with ticker for the configured handler interval then blocks indefinitely
func (s *Servers) Start(cfg config.Config) {
var wg sync.WaitGroup
for _, handler := range cfg.Handlers {
wg.Add(2)
go func(aHandler config.Handler) {
defer wg.Done()
startCGIServer(aHandler)
}(handler)
go func(aHandler config.Handler) {
defer wg.Done()
startTicker(aHandler, s.db, s.log)
}(handler)
}
wg.Wait()
}
func startCGIServer(h config.Handler) {
cgiHandler := cgi.Handler{Path: h.Exec}
server := http.Server{
Handler: &cgiHandler,
}
sock := fmt.Sprintf("%s.sock", h.Name)
os.Remove(sock)
unixListener, err := net.Listen("unix", sock)
if err != nil {
panic(err)
}
server.Serve(unixListener)
}
func startTicker(h config.Handler, db *badger.DB, log *zap.SugaredLogger) {
ticker := time.NewTicker(h.Interval)
done := make(chan bool)
func() {
for {
select {
case <-done:
return
case t := <-ticker.C:
output := tick(h)
keyName := fmt.Sprintf("outbox:%s:%d", h.Name, t.Unix())
err := db.Update(func(txn *badger.Txn) error {
e := badger.NewEntry([]byte(keyName), output)
log.With("name", "ticker").Infof("writing '%s' to %s", output, keyName)
return txn.SetEntry(e)
})
if err != nil {
log.Error(err)
}
}
}
}()
}
func tick(h config.Handler) []byte {
sock := fmt.Sprintf("%s.sock", h.Name)
httpc := http.Client{
Transport: &http.Transport{
DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
return net.Dial("unix", sock)
},
},
}
var response *http.Response
var err error
response, err = httpc.Get("http://unix/" + sock)
if err != nil {
panic(err)
}
body, err := ioutil.ReadAll(response.Body)
response.Body.Close()
return body
}
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