CT Google Storage utils to download/upload artifacts for workers

ct/go/util/gs_test.go

Index: ct/go/util/gs_test.go
diff --git a/ct/go/util/gs_test.go b/ct/go/util/gs_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..a2e962af350b6ae17147bdf78bf831a7126dbb67
--- /dev/null
+++ b/ct/go/util/gs_test.go
@@ -0,0 +1,123 @@
+package util
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"code.google.com/p/google-api-go-client/storage/v1"
+	"github.com/stretchr/testify/assert"
+	"skia.googlesource.com/buildbot.git/go/util"
+)
+
+// Will need a local valid google_storage_token.data file to run the below test.
+func Auth_TestDownloadWorkerArtifacts(t *testing.T) {
+	testPagesetsDirName := filepath.Join("unit-tests", "util", "page_sets")
+	client, _ := GetOAuthClient()
+	gs, err := NewGsUtil(client)
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+
+	tmpDir := filepath.Join(os.TempDir(), "util_test")
+	StorageDir = tmpDir
+	defer os.RemoveAll(tmpDir)
+	if err := gs.DownloadWorkerArtifacts(testPagesetsDirName, "10k", 1); err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+
+	// Examine contents of the local directory.
+	localDir := filepath.Join(tmpDir, testPagesetsDirName, "10k")
+	files, err := ioutil.ReadDir(localDir)
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	assert.Equal(t, 3, len(files))
+	assert.Equal(t, "TIMESTAMP", files[0].Name())
+	assert.Equal(t, "alexa1-1.py", files[1].Name())
+	assert.Equal(t, "alexa2-2.py", files[2].Name())
+}
+
+// Will need a local valid google_storage_token.data file to run the below test.
+func Auth_TestUploadWorkerArtifacts(t *testing.T) {
+	// testPagesetsDirName := filepath.Join("unit-tests", "util", "page_sets")
+	client, _ := GetOAuthClient()
+	gs, err := NewGsUtil(client)
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	testDir := "testupload"
+	testPagesetType := "10ktest"
+	StorageDir = "testdata"
+	// defer deleting this remove dir!!
+	if err := gs.UploadWorkerArtifacts(testDir, testPagesetType, 1); err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+
+	// Examine contents of the remote directory and then clean it up.
+	service, err := storage.New(gs.client)
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	gsDir := filepath.Join(testDir, testPagesetType, "slave1")
+	resp, err := service.Objects.List(GS_BUCKET_NAME).Prefix(gsDir + "/").Do()
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	assert.Equal(t, 3, len(resp.Items))
+	for index, fileName := range []string{"TIMESTAMP", "alexa1-1.py", "alexa2-2.py"} {
+		filePath := fmt.Sprintf("%s/%s", gsDir, fileName)
+		defer service.Objects.Delete(GS_BUCKET_NAME, filePath).Do()
+		assert.Equal(t, filePath, resp.Items[index].Name)
+	}
+}
+
+func TestAreTimestampsEqual(t *testing.T) {
+	gs_test_timestamp_value := "123"
+	gs, err := NewGsUtil(util.NewTimeoutClient())
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+
+	tmpDir := filepath.Join(os.TempDir(), "util_test")
+	os.Mkdir(tmpDir, 0777)
+	defer os.RemoveAll(tmpDir)
+
+	f, err := os.Create(filepath.Join(tmpDir, TIMESTAMP_FILE_NAME))
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	defer f.Close()
+
+	// Test with matching timestamps.
+	f.WriteString(gs_test_timestamp_value)
+	result1, err := gs.AreTimeStampsEqual(tmpDir, "unit-tests/util/")
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	assert.True(t, result1)
+
+	// Test with differing timestamps.
+	f.WriteString(gs_test_timestamp_value)
+	result2, err := gs.AreTimeStampsEqual(tmpDir, "unit-tests/util/")
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err)
+	}
+	assert.False(t, result2)
+
+	// Test with Google Storage timestamp missing.
+	result3, err := gs.AreTimeStampsEqual(tmpDir, "unit-tests/util/dummy_name/")
+	if err == nil {
+		t.Error("Expected an error")
+	}
+	assert.False(t, result3)
+
+	// Test with local timestamp missing.
+	result4, err := gs.AreTimeStampsEqual(tmpDir+"dummy_name", "unit-tests/util/")
+	if err == nil {
+		t.Error("Expected an error")
+	}
+	assert.False(t, result4)
+}