Retry temporary errors by default (#107)

* Adding Aurora URL validator in order to handle scenarios where incomplete information is passed to the client. The client will do its best to guess the missing information such as protocol and port.

* Upgraded to testify 1.3.0.

* Added configuration to fail on a non-temporary error. This is reverting to the original behavior of the retry mechanism. However, this allows the user to opt to fail in a non-temporary error.

util_test.go

@@ -0,0 +1,65 @@
+/**
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package realis
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAuroraURLValidator(t *testing.T) {
+	t.Run("badURL", func(t *testing.T) {
+		url, err := validateAuroraURL("http://badurl.com/badpath")
+		assert.Empty(t, url)
+		assert.Error(t, err)
+	})
+
+	t.Run("URLHttp", func(t *testing.T) {
+		url, err := validateAuroraURL("http://goodurl.com:8081/api")
+		assert.Equal(t, "http://goodurl.com:8081/api", url)
+		assert.NoError(t, err)
+	})
+
+	t.Run("URLHttps", func(t *testing.T) {
+		url, err := validateAuroraURL("https://goodurl.com:8081/api")
+		assert.Equal(t, "https://goodurl.com:8081/api", url)
+		assert.NoError(t, err)
+	})
+
+	t.Run("URLNoPath", func(t *testing.T) {
+		url, err := validateAuroraURL("http://goodurl.com:8081")
+		assert.Equal(t, "http://goodurl.com:8081/api", url)
+		assert.NoError(t, err)
+	})
+
+	t.Run("ipAddrNoPath", func(t *testing.T) {
+		url, err := validateAuroraURL("http://192.168.1.33:8081")
+		assert.Equal(t, "http://192.168.1.33:8081/api", url)
+		assert.NoError(t, err)
+	})
+
+	t.Run("URLNoProtocol", func(t *testing.T) {
+		url, err := validateAuroraURL("goodurl.com:8081/api")
+		assert.Equal(t, "http://goodurl.com:8081/api", url)
+		assert.NoError(t, err)
+	})
+
+	t.Run("URLNoProtocolNoPathNoPort", func(t *testing.T) {
+		url, err := validateAuroraURL("goodurl.com")
+		assert.Equal(t, "http://goodurl.com:8081/api", url)
+		assert.NoError(t, err)
+	})
+}