refactor(api): create a new structure for the Go api (#94)

* refactor(api): create a new structure for the Go api

* refactor(api): update the way keyFile parameter is managed

api/flags.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"gopkg.in/alecthomas/kingpin.v2"
+	"strings"
+)
+
+// TLSFlags defines all the flags associated to the SSL configuration
+type TLSFlags struct {
+	tls      bool
+	caPath   string
+	certPath string
+	keyPath  string
+}
+
+// pair defines a key/value pair
+type pair struct {
+	Name  string `json:"name"`
+	Value string `json:"value"`
+}
+
+// pairList defines an array of Label
+type pairList []pair
+
+// Set implementation for Labels
+func (l *pairList) Set(value string) error {
+	parts := strings.SplitN(value, "=", 2)
+	if len(parts) != 2 {
+		return fmt.Errorf("expected NAME=VALUE got '%s'", value)
+	}
+	p := new(pair)
+	p.Name = parts[0]
+	p.Value = parts[1]
+	*l = append(*l, *p)
+	return nil
+}
+
+// String implementation for Labels
+func (l *pairList) String() string {
+	return ""
+}
+
+// IsCumulative implementation for Labels
+func (l *pairList) IsCumulative() bool {
+	return true
+}
+
+// LabelParser defines a custom parser for Labels flags
+func pairs(s kingpin.Settings) (target *[]pair) {
+	target = new([]pair)
+	s.SetValue((*pairList)(target))
+	return
+}
+
+// newTLSFlags creates a new TLSFlags from command flags
+func newTLSFlags(tls bool, cacert string, cert string, key string) TLSFlags {
+	return TLSFlags{
+		tls:      tls,
+		caPath:   cacert,
+		certPath: cert,
+		keyPath:  key,
+	}
+}