First pass at reorganizing go code into sub-packages

internal/handlers/errors.go

@@ -0,0 +1,37 @@
+package handlers
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+)
+
+type Error struct {
+	ErrorId     int
+	ErrorString string
+}
+
+var error_codes = map[int]string{
+	1: "Not Signed In",
+	2: "Unauthorized Access",
+	3: "Invalid Request",
+	4: "User Exists",
+	//  5:   "Connection Failed", //reserved for client-side error
+	6:   "Import Error",
+	999: "Internal Error",
+}
+
+func WriteError(w http.ResponseWriter, error_code int) {
+	msg, ok := error_codes[error_code]
+	if !ok {
+		log.Printf("Error: WriteError received error code of %d", error_code)
+		msg = error_codes[999]
+	}
+	e := Error{error_code, msg}
+
+	enc := json.NewEncoder(w)
+	err := enc.Encode(e)
+	if err != nil {
+		log.Fatal(err)
+	}
+}