proxy: start on api and caddy based proxy

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

config/config.go

@@ -2,6 +2,6 @@ package config
 
 // Config is the top level configuration
 type Config struct {
-	ListenAddr    string
-	EnableMetrics bool
+	ListenAddr string
+	SocketPath string
 }

config/utils.go

@@ -2,6 +2,12 @@ package config
 
 import (
 	"github.com/BurntSushi/toml"
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	defaultListenAddr = ":8080"
+	defaultSocketPath = "/var/run/element.sock"
 )
 
 // ParseConfig returns a Config object from a raw string config TOML
@@ -11,5 +17,15 @@ func ParseConfig(data string) (*Config, error) {
 		return nil, err
 	}
 
+	if cfg.ListenAddr == "" {
+		logrus.Warnf("using default listen addr: %s", defaultListenAddr)
+		cfg.ListenAddr = defaultListenAddr
+	}
+
+	if cfg.SocketPath == "" {
+		logrus.Warnf("using default socket path: %s", defaultSocketPath)
+		cfg.SocketPath = defaultSocketPath
+	}
+
 	return &cfg, nil
 }