config: add configstruct parser to parse maps into config structures

fs/config/configstruct/configstruct_test.go

@@ -0,0 +1,116 @@
+package configstruct_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/ncw/rclone/fs"
+	"github.com/ncw/rclone/fs/config/configstruct"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type conf struct {
+	A string
+	B string
+}
+
+type conf2 struct {
+	PotatoPie      string `config:"spud_pie"`
+	BeanStew       bool
+	RaisinRoll     int
+	SausageOnStick int64
+	ForbiddenFruit uint
+	CookingTime    fs.Duration
+	TotalWeight    fs.SizeSuffix
+}
+
+func TestItemsError(t *testing.T) {
+	_, err := configstruct.Items(nil)
+	assert.EqualError(t, err, "argument must be a pointer")
+	_, err = configstruct.Items(new(int))
+	assert.EqualError(t, err, "argument must be a pointer to a struct")
+}
+
+func TestItems(t *testing.T) {
+	in := &conf2{
+		PotatoPie:      "yum",
+		BeanStew:       true,
+		RaisinRoll:     42,
+		SausageOnStick: 101,
+		ForbiddenFruit: 6,
+		CookingTime:    fs.Duration(42 * time.Second),
+		TotalWeight:    fs.SizeSuffix(17 << 20),
+	}
+	got, err := configstruct.Items(in)
+	require.NoError(t, err)
+	want := []configstruct.Item{
+		{Name: "spud_pie", Field: "PotatoPie", Num: 0, Value: string("yum")},
+		{Name: "bean_stew", Field: "BeanStew", Num: 1, Value: true},
+		{Name: "raisin_roll", Field: "RaisinRoll", Num: 2, Value: int(42)},
+		{Name: "sausage_on_stick", Field: "SausageOnStick", Num: 3, Value: int64(101)},
+		{Name: "forbidden_fruit", Field: "ForbiddenFruit", Num: 4, Value: uint(6)},
+		{Name: "cooking_time", Field: "CookingTime", Num: 5, Value: fs.Duration(42 * time.Second)},
+		{Name: "total_weight", Field: "TotalWeight", Num: 6, Value: fs.SizeSuffix(17 << 20)},
+	}
+	assert.Equal(t, want, got)
+}
+
+func TestSetBasics(t *testing.T) {
+	c := &conf{A: "one", B: "two"}
+	err := configstruct.Set(configMap{}, c)
+	require.NoError(t, err)
+	assert.Equal(t, &conf{A: "one", B: "two"}, c)
+}
+
+// a simple configmap.Getter for testing
+type configMap map[string]string
+
+// Get the value
+func (c configMap) Get(key string) (value string, ok bool) {
+	value, ok = c[key]
+	return value, ok
+}
+
+func TestSetMore(t *testing.T) {
+	c := &conf{A: "one", B: "two"}
+	m := configMap{
+		"a": "ONE",
+	}
+	err := configstruct.Set(m, c)
+	require.NoError(t, err)
+	assert.Equal(t, &conf{A: "ONE", B: "two"}, c)
+}
+
+func TestSetFull(t *testing.T) {
+	in := &conf2{
+		PotatoPie:      "yum",
+		BeanStew:       true,
+		RaisinRoll:     42,
+		SausageOnStick: 101,
+		ForbiddenFruit: 6,
+		CookingTime:    fs.Duration(42 * time.Second),
+		TotalWeight:    fs.SizeSuffix(17 << 20),
+	}
+	m := configMap{
+		"spud_pie":         "YUM",
+		"bean_stew":        "FALSE",
+		"raisin_roll":      "43 ",
+		"sausage_on_stick": " 102 ",
+		"forbidden_fruit":  "0x7",
+		"cooking_time":     "43s",
+		"total_weight":     "18M",
+	}
+	want := &conf2{
+		PotatoPie:      "YUM",
+		BeanStew:       false,
+		RaisinRoll:     43,
+		SausageOnStick: 102,
+		ForbiddenFruit: 7,
+		CookingTime:    fs.Duration(43 * time.Second),
+		TotalWeight:    fs.SizeSuffix(18 << 20),
+	}
+	err := configstruct.Set(m, in)
+	require.NoError(t, err)
+	assert.Equal(t, want, in)
+}