store: add blob interface with file implementation (#2004)

store/file/blob_test.go

@@ -0,0 +1,81 @@
+package file
+
+import (
+	"bytes"
+	"io/ioutil"
+	"testing"
+
+	"github.com/micro/go-micro/v3/store"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBlobStore(t *testing.T) {
+	blob, err := NewBlobStore()
+	assert.NotNilf(t, blob, "Blob should not be nil")
+	assert.Nilf(t, err, "Error should be nil")
+
+	t.Run("ReadMissingKey", func(t *testing.T) {
+		res, err := blob.Read("")
+		assert.Equal(t, store.ErrMissingKey, err, "Error should be missing key")
+		assert.Nil(t, res, "Result should be nil")
+	})
+
+	t.Run("ReadNotFound", func(t *testing.T) {
+		res, err := blob.Read("foo")
+		assert.Equal(t, store.ErrNotFound, err, "Error should be not found")
+		assert.Nil(t, res, "Result should be nil")
+	})
+
+	t.Run("WriteMissingKey", func(t *testing.T) {
+		buf := bytes.NewBuffer([]byte("HelloWorld"))
+		err := blob.Write("", buf)
+		assert.Equal(t, store.ErrMissingKey, err, "Error should be missing key")
+	})
+
+	t.Run("WriteValid", func(t *testing.T) {
+		buf := bytes.NewBuffer([]byte("world"))
+		err := blob.Write("hello", buf)
+		assert.Nilf(t, err, "Error should be nil")
+	})
+
+	t.Run("ReadValid", func(t *testing.T) {
+		val, err := blob.Read("hello")
+		bytes, _ := ioutil.ReadAll(val)
+		assert.Nilf(t, err, "Error should be nil")
+		assert.Equal(t, string(bytes), "world", "Value should be world")
+	})
+
+	t.Run("ReadIncorrectNamespace", func(t *testing.T) {
+		val, err := blob.Read("hello", store.BlobNamespace("bar"))
+		assert.Equal(t, store.ErrNotFound, err, "Error should be not found")
+		assert.Nil(t, val, "Value should be nil")
+	})
+
+	t.Run("ReadCorrectNamespace", func(t *testing.T) {
+		val, err := blob.Read("hello", store.BlobNamespace("micro"))
+		bytes, _ := ioutil.ReadAll(val)
+		assert.Nil(t, err, "Error should be nil")
+		assert.Equal(t, string(bytes), "world", "Value should be world")
+	})
+
+	t.Run("DeleteIncorrectNamespace", func(t *testing.T) {
+		err := blob.Delete("hello", store.BlobNamespace("bar"))
+		assert.Equal(t, store.ErrNotFound, err, "Error should be not found")
+	})
+
+	t.Run("DeleteCorrectNamespaceIncorrectKey", func(t *testing.T) {
+		err := blob.Delete("world", store.BlobNamespace("micro"))
+		assert.Equal(t, store.ErrNotFound, err, "Error should be not found")
+	})
+
+	t.Run("DeleteCorrectNamespace", func(t *testing.T) {
+		err := blob.Delete("hello", store.BlobNamespace("micro"))
+		assert.Nil(t, err, "Error should be nil")
+	})
+
+	t.Run("ReadDeletedKey", func(t *testing.T) {
+		res, err := blob.Read("hello", store.BlobNamespace("micro"))
+		assert.Equal(t, store.ErrNotFound, err, "Error should be not found")
+		assert.Nil(t, res, "Result should be nil")
+	})
+}