[GitHub] merlimat commented on a change in pull request #2855: Secretprovider interfaces and some default implementations

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merlimat commented on a change in pull request #2855: Secretprovider interfaces and some default implementations
URL: https://github.com/apache/pulsar/pull/2855#discussion_r228727551
 
 

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 File path: pulsar-functions/secrets/src/main/java/org/apache/pulsar/functions/secretsproviderconfigurator/KubernetesSecretsProviderConfigurator.java
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 @@ -0,0 +1,97 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.pulsar.functions.secretsproviderconfigurator;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import io.kubernetes.client.models.V1Container;
+import io.kubernetes.client.models.V1EnvVar;
+import io.kubernetes.client.models.V1EnvVarSource;
+import io.kubernetes.client.models.V1SecretKeySelector;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.pulsar.functions.proto.Function;
+import org.apache.pulsar.functions.secretsprovider.EnvironmentBasedSecretsProvider;
+
+import java.lang.reflect.Type;
+import java.util.Map;
+
+/**
+ * This file defines the SecretsProviderConfigurator that will be used by default for running in Kubernetes.
+ * As such this implementation is strictly when workers are configured to use kubernetes runtime.
+ * We use kubernetes in built secrets and bind them as environment variables within the function container
+ * to ensure that the secrets are availble to the function at runtime. Then we plug in the
+ * EnvironmentBasedSecretsConfig as the secrets provider who knows how to read these environment variables
+ */
+public class KubernetesSecretsProviderConfigurator implements SecretsProviderConfigurator {
+    @Override
+    public String getSecretsProviderClassName(Function.FunctionDetails functionDetails) {
+        switch (functionDetails.getRuntime()) {
+            case JAVA:
+                return EnvironmentBasedSecretsProvider.class.getName();
+            case PYTHON:
+                return "secretsprovider.EnvironmentBasedSecretsProvider";
+            default:
+                throw new RuntimeException("Unknown function runtime " + functionDetails.getRuntime());
+        }
+    }
+
+    @Override
+    public Map<String, String> getSecretsProviderConfig(Function.FunctionDetails functionDetails) {
+        return null;
+    }
+
+    @Override
+    public void configureKubernetesRuntimeSecretsProvider(V1Container container, Function.FunctionDetails functionDetails) {
+        if (!StringUtils.isEmpty(functionDetails.getSecretsMap())) {
 
 Review comment:
   Can you summarize in a comment what the implementation is doing here?

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