implement rest endpoint

presto-function-namespace-managers/pom.xml

@@ -149,6 +149,21 @@
             <scope>provided</scope>
         </dependency>
 
+        <dependency>
+            <groupId>com.facebook.drift</groupId>
+            <artifactId>drift-transport-netty</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.facebook.airlift</groupId>
+            <artifactId>http-client</artifactId>
+        </dependency>
+
         <!-- for testing -->
         <dependency>
             <groupId>com.facebook.presto</groupId>
@@ -174,11 +189,6 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>com.facebook.drift</groupId>
-            <artifactId>drift-transport-netty</artifactId>
-        </dependency>
-
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>

presto-function-namespace-managers/src/main/java/com/facebook/presto/functionNamespace/execution/rest/RestClient.java

@@ -0,0 +1,26 @@
+/*
+ * 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 com.facebook.presto.functionNamespace.execution.rest;
+
+import com.google.inject.BindingAnnotation;
+
+import java.lang.annotation.Retention;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+@Retention(RUNTIME)
+@BindingAnnotation
+public @interface RestClient
+{
+}

presto-function-namespace-managers/src/main/java/com/facebook/presto/functionNamespace/execution/rest/RestComminicationModule.java

@@ -0,0 +1,29 @@
+/*
+ * 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 com.facebook.presto.functionNamespace.execution.rest;
+
+import com.google.inject.Binder;
+import com.google.inject.Module;
+
+import static com.facebook.airlift.http.client.HttpClientBinder.httpClientBinder;
+
+public class RestComminicationModule
+        implements Module
+{
+    @Override
+    public void configure(Binder binder)
+    {
+        httpClientBinder(binder).bindHttpClient("rest", RestClient.class);
+    }
+}

presto-function-namespace-managers/src/main/java/com/facebook/presto/functionNamespace/execution/rest/RestSqlFunctionExecutionModule.java

@@ -0,0 +1,29 @@
+/*
+ * 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 com.facebook.presto.functionNamespace.execution.rest;
+
+import com.facebook.presto.functionNamespace.execution.SqlFunctionExecutionModule;
+import com.facebook.presto.spi.function.SqlFunctionExecutor;
+import com.google.inject.Binder;
+import com.google.inject.Scopes;
+
+public class RestSqlFunctionExecutionModule
+        extends SqlFunctionExecutionModule
+{
+    @Override
+    protected void setup(Binder binder)
+    {
+        binder.bind(SqlFunctionExecutor.class).to(RestSqlFunctionExecutor.class).in(Scopes.SINGLETON);
+    }
+}

presto-function-namespace-managers/src/main/java/com/facebook/presto/functionNamespace/execution/rest/RestSqlFunctionExecutor.java

@@ -0,0 +1,188 @@
+/*
+ * 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 com.facebook.presto.functionNamespace.execution.rest;
+
+import com.facebook.airlift.http.client.HttpClient;
+import com.facebook.airlift.http.client.HttpStatus;
+import com.facebook.airlift.http.client.HttpUriBuilder;
+import com.facebook.airlift.http.client.Request;
+import com.facebook.airlift.http.client.Response;
+import com.facebook.airlift.http.client.ResponseHandler;
+import com.facebook.presto.common.Page;
+import com.facebook.presto.common.block.BlockEncodingSerde;
+import com.facebook.presto.common.function.SqlFunctionResult;
+import com.facebook.presto.common.type.Type;
+import com.facebook.presto.common.type.TypeSignature;
+import com.facebook.presto.spi.NodeManager;
+import com.facebook.presto.spi.PrestoException;
+import com.facebook.presto.spi.function.FunctionImplementationType;
+import com.facebook.presto.spi.function.RemoteScalarFunctionImplementation;
+import com.facebook.presto.spi.function.SqlFunctionExecutor;
+import com.facebook.presto.spi.function.SqlFunctionHandle;
+import com.facebook.presto.spi.function.SqlFunctionId;
+import com.facebook.presto.spi.page.PagesSerde;
+import com.facebook.presto.spi.page.SerializedPage;
+import com.google.common.util.concurrent.FutureCallback;
+import com.google.common.util.concurrent.Futures;
+import io.airlift.slice.DynamicSliceOutput;
+import io.airlift.slice.InputStreamSliceInput;
+import io.airlift.slice.SliceInput;
+
+import javax.inject.Inject;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+import static com.facebook.airlift.concurrent.MoreFutures.toCompletableFuture;
+import static com.facebook.airlift.http.client.HttpUriBuilder.uriBuilderFrom;
+import static com.facebook.airlift.http.client.Request.Builder.preparePost;
+import static com.facebook.airlift.http.client.StaticBodyGenerator.createStaticBodyGenerator;
+import static com.facebook.presto.spi.StandardErrorCode.FUNCTION_SERVER_FAILURE;
+import static com.facebook.presto.spi.StandardErrorCode.NOT_FOUND;
+import static com.facebook.presto.spi.function.FunctionImplementationType.REST;
+import static com.facebook.presto.spi.page.PagesSerdeUtil.readSerializedPage;
+import static com.facebook.presto.spi.page.PagesSerdeUtil.writeSerializedPage;
+import static com.google.common.base.Preconditions.checkState;
+import static com.google.common.collect.ImmutableList.toImmutableList;
+import static com.google.common.net.HttpHeaders.ACCEPT;
+import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
+import static com.google.common.net.MediaType.PLAIN_TEXT_UTF_8;
+import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
+import static java.util.Objects.requireNonNull;
+
+public class RestSqlFunctionExecutor
+        implements SqlFunctionExecutor
+{
+    private BlockEncodingSerde blockEncodingSerde;
+    private PagesSerde pageSerde;
+    private HttpClient httpClient;
+    private final NodeManager nodeManager;
+    private final RestURIServerConfig restURIServerConfig;
+
+    @Inject
+    public RestSqlFunctionExecutor(NodeManager nodeManager, RestURIServerConfig restURIServerConfig, @RestClient HttpClient httpClient)
+    {
+        this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
+        this.restURIServerConfig = requireNonNull(restURIServerConfig, "restURIServerConfig is null");
+        this.httpClient = requireNonNull(httpClient, "httpClient is null");
+    }
+
+    @Override
+    public FunctionImplementationType getImplementationType()
+    {
+        return REST;
+    }
+
+    @Override
+    public void setBlockEncodingSerde(BlockEncodingSerde blockEncodingSerde)
+    {
+        checkState(this.blockEncodingSerde == null, "blockEncodingSerde already set");
+        this.blockEncodingSerde = requireNonNull(blockEncodingSerde, "blockEncodingSerde is null");
+        this.pageSerde = new PagesSerde(blockEncodingSerde, Optional.empty(), Optional.empty(), Optional.empty());
+    }
+
+    @Override
+    public CompletableFuture<SqlFunctionResult> executeFunction(
+            String source,
+            RemoteScalarFunctionImplementation functionImplementation,
+            Page input,
+            List<Integer> channels,
+            List<Type> argumentTypes,
+            Type returnType)
+    {
+        SqlFunctionHandle functionHandle = functionImplementation.getFunctionHandle();
+        SqlFunctionId functionId = functionHandle.getFunctionId();
+        DynamicSliceOutput sliceOutput = new DynamicSliceOutput((int) input.getRetainedSizeInBytes());
+        writeSerializedPage(sliceOutput, pageSerde.serialize(input));
+        try {
+            Request request = preparePost()
+                    .setUri(getNativeWorkerUri(functionId, returnType))
+                    .setBodyGenerator(createStaticBodyGenerator(sliceOutput.slice().byteArray()))
+                    .setHeader(CONTENT_TYPE, PLAIN_TEXT_UTF_8.toString())
+                    .setHeader(ACCEPT, PLAIN_TEXT_UTF_8.toString())
+                    .build();
+            HttpClient.HttpResponseFuture<SqlFunctionResult> future = httpClient.executeAsync(request, createSqlFunctionResultResponseHandler());
+            Futures.addCallback(future, new FutureCallback<SqlFunctionResult>() {
+                @Override
+                public void onSuccess(SqlFunctionResult result)
+                {
+                    result.getResult();
+                }
+
+                @Override
+                public void onFailure(Throwable t)
+                {
+                    throw new PrestoException(FUNCTION_SERVER_FAILURE, "Failed with message " + t.getMessage());
+                }
+            }, directExecutor());
+            return toCompletableFuture(future);
+        }
+        catch (Exception e) {
+            throw new IllegalStateException("Failed to get function definitions for REST server/ Native worker, " + e.getMessage());
+        }
+    }
+
+    private URI getNativeWorkerUri(SqlFunctionId functionId, Type returnType)
+    {
+        List<String> functionArgumentTypes = functionId.getArgumentTypes().stream().map(TypeSignature::toString).collect(toImmutableList());
+        if (restURIServerConfig.getRestUri() == null) {
+            throw new PrestoException(NOT_FOUND, "Failed to find native node !");
+        }
+
+        HttpUriBuilder uri = uriBuilderFrom(URI.create(restURIServerConfig.getRestUri()))
+                .appendPath("/v1/functions/" + functionId.getFunctionName().getObjectName())
+                .addParameter("returnType", returnType.toString())
+                .addParameter("numArgs", "" + functionArgumentTypes.size());
+        for (int i = 1; i <= functionArgumentTypes.size(); i++) {
+            uri.addParameter("argType" + i, functionArgumentTypes.get(i - 1));
+        }
+        return uri.build();
+    }
+
+    ResponseHandler createSqlFunctionResultResponseHandler()
+    {
+        return new ResponseHandler<SqlFunctionResult, RuntimeException>() {
+            @Override
+            public SqlFunctionResult handleException(Request request, Exception exception)
+            {
+                return null;
+            }
+
+            @Override
+            public SqlFunctionResult handle(Request request, Response response)
+            {
+                if (response.getStatusCode() != 200 || response.getStatusCode() != HttpStatus.OK.code()) {
+                    throw new PrestoException(FUNCTION_SERVER_FAILURE, "Failed to get response for rest function call from function server. Response code: " + response.getStatusCode());
+                }
+                try {
+                    SliceInput input = new InputStreamSliceInput(response.getInputStream());
+                    SerializedPage serializedPage = readSerializedPage(input);
+                    if (pageSerde.deserialize(serializedPage).getChannelCount() == 1) {
+                        SqlFunctionResult output = new SqlFunctionResult(pageSerde.deserialize(serializedPage).getBlock(0), 1);
+                        return output;
+                    }
+                    else {
+                        throw new IllegalStateException("More than one Block in the Page");
+                    }
+                }
+                catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        };
+    }
+}

presto-function-namespace-managers/src/main/java/com/facebook/presto/functionNamespace/execution/rest/RestURIServerConfig.java

@@ -0,0 +1,33 @@
+/*
+ * 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 com.facebook.presto.functionNamespace.execution.rest;
+
+import com.facebook.airlift.configuration.Config;
+
+public class RestURIServerConfig
+{
+    private String restUri;
+
+    public String getRestUri()
+    {
+        return restUri;
+    }
+
+    @Config("rest-uri")
+    public RestURIServerConfig setRestUri(String restUri)
+    {
+        this.restUri = restUri;
+        return this;
+    }
+}