added function management API

Author: dstpierre

function.go

@@ -0,0 +1,45 @@
+package backend
+
+import "time"
+
+type Function struct {
+	ID           string       `json:"id"`
+	FunctionName string       `json:"name"`
+	TriggerTopic string       `json:"trigger"`
+	Code         string       `json:"code"`
+	Version      int          `json:"version"`
+	LastUpdated  time.Time    `json:"lastUpdated"`
+	LastRun      time.Time    `json:"lastRun"`
+	History      []RunHistory `json:"history"`
+}
+
+type RunHistory struct {
+	ID        string    `json:"id"`
+	Version   int       `json:"version"`
+	Started   time.Time `json:"started"`
+	Completed time.Time `json:"completed"`
+	Success   bool      `json:"success"`
+	Output    []string  `json:"output"`
+}
+
+func AddFunction(token string, fn Function) error {
+	return Post(token, "/fn/add", fn, nil)
+}
+
+func ListFunctions(token string) (results []Function, err error) {
+	err = Get(token, "/fn", &results)
+	return
+}
+
+func UpdateFunction(token string, fn Function) error {
+	return Post(token, "/fn/update", fn, nil)
+}
+
+func DeleteFunction(token, name string) error {
+	return Get(token, "/fn/del/"+name, nil)
+}
+
+func FunctionInfo(token, name string) (fn Function, err error) {
+	err = Get(token, "/fn/info/"+name, &fn)
+	return
+}