New static configuration loading system.

Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>

pkg/cli/file_finder_test.go

@@ -0,0 +1,162 @@
+package cli
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFinder_Find(t *testing.T) {
+	configFile, err := ioutil.TempFile("", "traefik-file-finder-test-*.toml")
+	require.NoError(t, err)
+
+	defer func() {
+		_ = os.Remove(configFile.Name())
+	}()
+
+	dir, err := ioutil.TempDir("", "traefik-file-finder-test")
+	require.NoError(t, err)
+
+	defer func() {
+		_ = os.RemoveAll(dir)
+	}()
+
+	fooFile, err := os.Create(filepath.Join(dir, "foo.toml"))
+	require.NoError(t, err)
+
+	_, err = os.Create(filepath.Join(dir, "bar.toml"))
+	require.NoError(t, err)
+
+	type expected struct {
+		error bool
+		path  string
+	}
+
+	testCases := []struct {
+		desc       string
+		basePaths  []string
+		configFile string
+		expected   expected
+	}{
+		{
+			desc:       "not found: no config file",
+			configFile: "",
+			expected:   expected{path: ""},
+		},
+		{
+			desc:       "not found: no config file, no other paths available",
+			configFile: "",
+			basePaths:  []string{"/my/path/traefik", "$HOME/my/path/traefik", "./my-traefik"},
+			expected:   expected{path: ""},
+		},
+		{
+			desc:       "not found: with non existing config file",
+			configFile: "/my/path/config.toml",
+			expected:   expected{path: ""},
+		},
+		{
+			desc:       "found: with config file",
+			configFile: configFile.Name(),
+			expected:   expected{path: configFile.Name()},
+		},
+		{
+			desc:       "found: no config file, first base path",
+			configFile: "",
+			basePaths:  []string{filepath.Join(dir, "foo"), filepath.Join(dir, "bar")},
+			expected:   expected{path: fooFile.Name()},
+		},
+		{
+			desc:       "found: no config file, base path",
+			configFile: "",
+			basePaths:  []string{"/my/path/traefik", "$HOME/my/path/traefik", filepath.Join(dir, "foo")},
+			expected:   expected{path: fooFile.Name()},
+		},
+		{
+			desc:       "found: config file over base path",
+			configFile: configFile.Name(),
+			basePaths:  []string{filepath.Join(dir, "foo"), filepath.Join(dir, "bar")},
+			expected:   expected{path: configFile.Name()},
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+
+			finder := Finder{
+				BasePaths:  test.basePaths,
+				Extensions: []string{"toml", "yaml", "yml"},
+			}
+
+			path, err := finder.Find(test.configFile)
+
+			if test.expected.error {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				assert.Equal(t, test.expected.path, path)
+			}
+		})
+	}
+}
+
+func TestFinder_getPaths(t *testing.T) {
+	testCases := []struct {
+		desc       string
+		basePaths  []string
+		configFile string
+		expected   []string
+	}{
+		{
+			desc:       "no config file",
+			basePaths:  []string{"/etc/traefik/traefik", "$HOME/.config/traefik", "./traefik"},
+			configFile: "",
+			expected: []string{
+				"/etc/traefik/traefik.toml",
+				"/etc/traefik/traefik.yaml",
+				"/etc/traefik/traefik.yml",
+				"$HOME/.config/traefik.toml",
+				"$HOME/.config/traefik.yaml",
+				"$HOME/.config/traefik.yml",
+				"./traefik.toml",
+				"./traefik.yaml",
+				"./traefik.yml",
+			},
+		},
+		{
+			desc:       "with config file",
+			basePaths:  []string{"/etc/traefik/traefik", "$HOME/.config/traefik", "./traefik"},
+			configFile: "/my/path/config.toml",
+			expected: []string{
+				"/my/path/config.toml",
+				"/etc/traefik/traefik.toml",
+				"/etc/traefik/traefik.yaml",
+				"/etc/traefik/traefik.yml",
+				"$HOME/.config/traefik.toml",
+				"$HOME/.config/traefik.yaml",
+				"$HOME/.config/traefik.yml",
+				"./traefik.toml",
+				"./traefik.yaml",
+				"./traefik.yml",
+			},
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			finder := Finder{
+				BasePaths:  test.basePaths,
+				Extensions: []string{"toml", "yaml", "yml"},
+			}
+			paths := finder.getPaths(test.configFile)
+
+			assert.Equal(t, test.expected, paths)
+		})
+	}
+}