Move cli to separate package

cli/base.go

@@ -0,0 +1,77 @@
+package cli
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/url"
+
+	"github.com/9seconds/mtg/v2/config"
+	"github.com/9seconds/mtg/v2/mtglib/network"
+)
+
+type base struct {
+	network network.Network
+	conf    *config.Config
+}
+
+func (b *base) ReadConfig(path string) error {
+	content, err := ioutil.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("cannot read config file: %w", err)
+	}
+
+	conf, err := config.Parse(content)
+	if err != nil {
+		return fmt.Errorf("cannot parse config: %w", err)
+	}
+
+	ntw, err := b.makeNetwork(conf)
+	if err != nil {
+		return fmt.Errorf("cannot build a network: %w", err)
+	}
+
+	b.conf = conf
+	b.network = ntw
+
+	return nil
+}
+
+func (b *base) makeNetwork(conf *config.Config) (network.Network, error) {
+	tcpTimeout := conf.Network.Timeout.TCP.Value(network.DefaultTimeout)
+	idleTimeout := conf.Network.Timeout.Idle.Value(network.DefaultIdleTimeout)
+	dohIP := conf.Network.DOHIP.Value(net.ParseIP(network.DefaultDOHHostname)).String()
+	bufferSize := conf.TCPBuffer.Value(network.DefaultBufferSize)
+
+	baseDialer, err := network.NewDefaultDialer(tcpTimeout, int(bufferSize))
+	if err != nil {
+		return nil, fmt.Errorf("cannot build a default dialer: %w", err)
+	}
+
+	proxyURLs := make([]*url.URL, 0, len(conf.Network.Proxies))
+
+	for _, v := range conf.Network.Proxies {
+		if value := v.Value(nil); value != nil {
+			proxyURLs = append(proxyURLs, v.Value(nil))
+		}
+	}
+
+	switch len(proxyURLs) {
+	case 0:
+		return network.NewNetwork(baseDialer, dohIP, idleTimeout)
+	case 1:
+		socksDialer, err := network.NewSocks5Dialer(baseDialer, proxyURLs[0])
+		if err != nil {
+			return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
+		}
+
+		return network.NewNetwork(socksDialer, dohIP, idleTimeout)
+	}
+
+	socksDialer, err := network.NewLoadBalancedSocks5Dialer(baseDialer, proxyURLs)
+	if err != nil {
+		return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
+	}
+
+	return network.NewNetwork(socksDialer, dohIP, idleTimeout)
+}