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package imap
import (
"fmt"
"net"
"sync"
"time"
uidplus "github.com/emersion/go-imap-uidplus"
imapClient "github.com/emersion/go-imap/client"
"github.com/Necoro/feed2imap-go/pkg/config"
"github.com/Necoro/feed2imap-go/pkg/log"
)
type connConf struct {
host string
delimiter string
toplevel Folder
}
type Client struct {
connConf
mailboxes *mailboxes
commander *commander
connections []*connection
maxConnections int
connChannel chan *connection
connLock sync.Mutex
disconnected bool
}
var dialer imapClient.Dialer
func init() {
dialer = &net.Dialer{Timeout: 30 * time.Second}
}
func newImapClient(url config.Url) (c *imapClient.Client, err error) {
if url.ForceTLS() {
if c, err = imapClient.DialWithDialerTLS(dialer, url.HostPort(), nil); err != nil {
return nil, fmt.Errorf("connecting (TLS) to %s: %w", url.Host, err)
}
log.Print("Connected to ", url.HostPort(), " (TLS)")
} else {
if c, err = imapClient.DialWithDialer(dialer, url.HostPort()); err != nil {
return nil, fmt.Errorf("connecting to %s: %w", url.Host, err)
}
}
return
}
func (cl *Client) connect(url config.Url) (*connection, error) {
c, err := newImapClient(url)
if err != nil {
return nil, err
}
cl.connLock.Lock()
defer cl.connLock.Unlock()
if cl.disconnected {
return nil, nil
}
conn := cl.createConnection(c)
if !url.ForceTLS() {
if err = conn.startTls(); err != nil {
return nil, err
}
}
if err = c.Login(url.User, url.Password); err != nil {
return nil, fmt.Errorf("login to %s: %w", url.Host, err)
}
cl.connChannel <- conn
return conn, nil
}
func (cl *Client) Disconnect() {
if cl != nil {
cl.connLock.Lock()
cl.stopCommander()
close(cl.connChannel)
connected := false
for _, conn := range cl.connections {
connected = conn.disconnect() || connected
}
if connected {
log.Print("Disconnected from ", cl.host)
}
cl.disconnected = true
cl.connLock.Unlock()
}
}
func (cl *Client) createConnection(c *imapClient.Client) *connection {
if len(cl.connections) == cl.maxConnections {
panic("Too many connections")
}
client := &client{c, uidplus.NewClient(c)}
conn := &connection{
connConf: &cl.connConf,
mailboxes: cl.mailboxes,
c: client,
}
cl.connections = append(cl.connections, conn)
return conn
}
func newClient(maxConnections int) *Client {
return &Client{
mailboxes: NewMailboxes(),
connChannel: make(chan *connection, 0),
connections: make([]*connection, 0, maxConnections),
maxConnections: maxConnections,
}
}
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