correcting some behaviors for $DOCKER_HOST, now uses container's private IP instead of localhost

internal/docker/container_helper.go

@@ -0,0 +1,90 @@
+package docker
+
+import (
+	"strings"
+
+	"github.com/docker/docker/api/types"
+	U "github.com/yusing/go-proxy/internal/utils"
+)
+
+type containerHelper struct {
+	*types.Container
+}
+
+// getDeleteLabel gets the value of a label and then deletes it from the container.
+// If the label does not exist, an empty string is returned.
+func (c containerHelper) getDeleteLabel(label string) string {
+	if l, ok := c.Labels[label]; ok {
+		delete(c.Labels, label)
+		return l
+	}
+	return ""
+}
+
+func (c containerHelper) getAliases() []string {
+	if l := c.getDeleteLabel(LabelAliases); l != "" {
+		return U.CommaSeperatedList(l)
+	}
+	return []string{c.getName()}
+}
+
+func (c containerHelper) getName() string {
+	return strings.TrimPrefix(c.Names[0], "/")
+}
+
+func (c containerHelper) getImageName() string {
+	colonSep := strings.Split(c.Image, ":")
+	slashSep := strings.Split(colonSep[0], "/")
+	return slashSep[len(slashSep)-1]
+}
+
+func (c containerHelper) getPublicPortMapping() PortMapping {
+	res := make(PortMapping)
+	for _, v := range c.Ports {
+		if v.PublicPort == 0 {
+			continue
+		}
+		res[U.PortString(v.PublicPort)] = v
+	}
+	return res
+}
+
+func (c containerHelper) getPrivatePortMapping() PortMapping {
+	res := make(PortMapping)
+	for _, v := range c.Ports {
+		res[U.PortString(v.PrivatePort)] = v
+	}
+	return res
+}
+
+var databaseMPs = map[string]struct{}{
+	"/var/lib/postgresql/data": {},
+	"/var/lib/mysql":           {},
+	"/var/lib/mongodb":         {},
+	"/var/lib/mariadb":         {},
+	"/var/lib/memcached":       {},
+	"/var/lib/rabbitmq":        {},
+}
+
+var databasePrivPorts = map[uint16]struct{}{
+	5432:  {}, // postgres
+	3306:  {}, // mysql, mariadb
+	6379:  {}, // redis
+	11211: {}, // memcached
+	27017: {}, // mongodb
+}
+
+func (c containerHelper) isDatabase() bool {
+	for _, m := range c.Mounts {
+		if _, ok := databaseMPs[m.Destination]; ok {
+			return true
+		}
+	}
+
+	for _, v := range c.Ports {
+		if _, ok := databasePrivPorts[v.PrivatePort]; ok {
+			return true
+		}
+	}
+	return false
+}