91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
// Package managesieve implements a RFC 5804 ManageSieve server — the
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// protocol mail clients (Thunderbird's Sieve plugin, etc.) use to upload and
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// manage server-side filtering scripts. Every uploaded script is validated
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// with internal/sieve's parser before being stored, so a syntactically
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// invalid script is rejected at PUTSCRIPT time rather than silently failing
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// at delivery time.
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package managesieve
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import (
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"context"
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"crypto/tls"
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"fmt"
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"log/slog"
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"net"
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"sync"
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"time"
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"gomail/internal/db"
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)
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const idleTimeout = 10 * time.Minute
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type Server struct {
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database *db.DB
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tlsConf *tls.Config
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hostname string
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listener net.Listener
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wg sync.WaitGroup
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sessionWG sync.WaitGroup
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}
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func NewServer(database *db.DB, tlsConf *tls.Config, hostname string) *Server {
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return &Server{database: database, tlsConf: tlsConf, hostname: hostname}
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}
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func (s *Server) ListenAndServe(ctx context.Context, addr string) error {
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ln, err := net.Listen("tcp", addr)
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if err != nil {
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return fmt.Errorf("listen %s: %w", addr, err)
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}
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s.listener = ln
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slog.Info("ManageSieve listener started", "addr", addr)
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s.wg.Add(1)
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go func() {
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defer s.wg.Done()
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s.acceptLoop(ctx, ln)
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}()
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<-ctx.Done()
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return ctx.Err()
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}
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func (s *Server) acceptLoop(ctx context.Context, ln net.Listener) {
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for {
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conn, err := ln.Accept()
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if err != nil {
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select {
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case <-ctx.Done():
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return
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default:
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slog.Error("ManageSieve accept error", "err", err)
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return
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}
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}
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s.sessionWG.Add(1)
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go func() {
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defer s.sessionWG.Done()
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newSession(conn, s).run(ctx)
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}()
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}
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}
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func (s *Server) Shutdown(gracePeriod time.Duration) {
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if s.listener != nil {
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s.listener.Close()
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}
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s.wg.Wait()
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done := make(chan struct{})
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go func() {
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s.sessionWG.Wait()
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close(done)
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}()
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select {
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case <-done:
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case <-time.After(gracePeriod):
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slog.Warn("ManageSieve shutdown grace period expired")
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}
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}
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