new: added new Meta field to Endpoint objects (closes #66)

network/meta.go

@@ -0,0 +1,44 @@
+package network
+
+import (
+	"encoding/json"
+	"sync"
+)
+
+type Meta struct {
+	sync.Mutex
+	m map[string]interface{}
+}
+
+// we want to protect concurrent access to the Meta
+// object so the m field needs to be unexported, this
+// is to have it in JSON regardless.
+type metaJSON struct {
+	Values map[string]interface{} `json:"values"`
+}
+
+func NewMeta() *Meta {
+	return &Meta{
+		m: make(map[string]interface{}),
+	}
+}
+
+func (m *Meta) MarshalJSON() ([]byte, error) {
+	return json.Marshal(metaJSON{Values: m.m})
+}
+
+func (m *Meta) Set(name string, value interface{}) {
+	m.Lock()
+	defer m.Unlock()
+	m.m[name] = value
+}
+
+func (m *Meta) Get(name string) interface{} {
+	m.Lock()
+	defer m.Unlock()
+
+	if v, found := m.m[name]; found == true {
+		return v
+	}
+	return ""
+}