Initial commit

internal/services/services.go

@@ -0,0 +1,69 @@
+package services
+
+import (
+	"context"
+	"io"
+	"log"
+
+	"ur.gs/crockery/internal/imap"
+	"ur.gs/crockery/internal/smtp"
+	"ur.gs/crockery/internal/store"
+)
+
+type Interface interface {
+	Run() // Run the services
+}
+
+func New(ctx context.Context, datastore store.Interface) (Interface, error) {
+	ctx, cancelFunc := context.WithCancel(ctx)
+
+	return &concrete{
+		ctx:    ctx,
+		cancel: cancelFunc,
+		store:  datastore,
+	}, nil
+}
+
+type genServer interface {
+	Run()
+
+	io.Closer
+}
+
+type concrete struct {
+	ctx    context.Context
+	cancel context.CancelFunc
+	store  store.Interface
+
+	// This is only mutated in the Run() method
+	servers []genServer
+}
+
+// For now, bind unconditionally to these ports, on IPv4 + IPv6:
+// 25  - incoming SMTP (STARTTLS)
+// 587 - outgoing SMTP (STARTTLS)
+// 143 - IMAP (STARTTLS)
+// 993 - IMAP (TLS)
+//
+// Each listener gets incoming connections serviced against the passed-in store.
+func (c *concrete) Run() {
+	c.servers = []genServer{
+		smtp.NewServer(c.cancel, c.store, false),
+		smtp.NewServer(c.cancel, c.store, true),
+
+		imap.NewServer(c.cancel, c.store, false),
+		imap.NewServer(c.cancel, c.store, true),
+	}
+
+	log.Print("Running all services")
+	for _, srv := range c.servers {
+		go srv.Run()
+	}
+
+	<-c.ctx.Done()
+
+	log.Print("Closing all services")
+	for _, srv := range c.servers {
+		srv.Close()
+	}
+}