Add support for REST based remote functions

CMakeLists.txt

@@ -108,7 +108,7 @@ option(VELOX_ENABLE_ABFS "Build Abfs Connector" OFF)
 option(VELOX_ENABLE_HDFS "Build Hdfs Connector" OFF)
 option(VELOX_ENABLE_PARQUET "Enable Parquet support" OFF)
 option(VELOX_ENABLE_ARROW "Enable Arrow support" OFF)
-option(VELOX_ENABLE_REMOTE_FUNCTIONS "Enable remote function support" OFF)
+option(VELOX_ENABLE_REMOTE_FUNCTIONS "Enable remote function support" ON)
 option(VELOX_ENABLE_CCACHE "Use ccache if installed." ON)
 
 option(VELOX_BUILD_TEST_UTILS "Builds Velox test utilities" OFF)
@@ -475,6 +475,12 @@ if(${VELOX_BUILD_TESTING})
   resolve_dependency(gRPC)
 endif()
 
+if(VELOX_ENABLE_REMOTE_FUNCTIONS)
+  find_package(fizz CONFIG REQUIRED)
+  find_package(wangle CONFIG REQUIRED)
+  find_package(proxygen CONFIG REQUIRED)
+endif()
+
 if(VELOX_ENABLE_REMOTE_FUNCTIONS)
   # TODO: Move this to use resolve_dependency(). For some reason, FBThrift
   # requires clients to explicitly install fizz and wangle.

velox/common/config/CMakeLists.txt

@@ -12,13 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-if (${VELOX_BUILD_TESTING})
+if(${VELOX_BUILD_TESTING})
   add_subdirectory(tests)
-endif ()
+endif()
 
 velox_add_library(velox_common_config Config.cpp)
 velox_link_libraries(
   velox_common_config
-  PUBLIC velox_common_base
-         velox_exception
+  PUBLIC velox_common_base velox_exception
   PRIVATE re2::re2)

velox/functions/remote/CMakeLists.txt

@@ -12,6 +12,27 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+if(NOT DEFINED PROXYGEN_LIBRARIES)
+  find_package(Sodium REQUIRED)
+
+  find_library(PROXYGEN proxygen)
+  find_library(PROXYGEN_HTTP_SERVER proxygenhttpserver)
+  find_library(FIZZ fizz)
+  find_library(WANGLE wangle)
+
+  if(NOT PROXYGEN
+     OR NOT PROXYGEN_HTTP_SERVER
+     OR NOT FIZZ
+     OR NOT WANGLE)
+    message(
+      FATAL_ERROR
+        "One or more proxygen libraries were not found. Please ensure proxygen, proxygenhttpserver, fizz, and wangle are installed."
+    )
+  endif()
+
+  set(PROXYGEN_LIBRARIES ${PROXYGEN_HTTP_SERVER} ${PROXYGEN} ${WANGLE} ${FIZZ})
+endif()
+
 add_subdirectory(if)
 add_subdirectory(client)
 add_subdirectory(server)

velox/functions/remote/client/CMakeLists.txt

@@ -16,11 +16,16 @@ velox_add_library(velox_functions_remote_thrift_client ThriftClient.cpp)
 velox_link_libraries(velox_functions_remote_thrift_client
                      PUBLIC remote_function_thrift FBThrift::thriftcpp2)
 
+velox_add_library(velox_functions_remote_rest_client RestClient.cpp)
+velox_link_libraries(velox_functions_remote_rest_client ${PROXYGEN_LIBRARIES}
+                     Folly::folly)
+
 velox_add_library(velox_functions_remote Remote.cpp)
 velox_link_libraries(
   velox_functions_remote
   PUBLIC velox_expression
          velox_functions_remote_thrift_client
+         velox_functions_remote_rest_client
          velox_functions_remote_get_serde
          velox_type_fbhive
          Folly::folly)

velox/functions/remote/client/Remote.cpp

@@ -19,6 +19,7 @@
 #include <folly/io/async/EventBase.h>
 #include "velox/expression/Expr.h"
 #include "velox/expression/VectorFunction.h"
+#include "velox/functions/remote/client/RestClient.h"
 #include "velox/functions/remote/client/ThriftClient.h"
 #include "velox/functions/remote/if/GetSerde.h"
 #include "velox/functions/remote/if/gen-cpp2/RemoteFunctionServiceAsyncClient.h"
@@ -33,17 +34,31 @@ std::string serializeType(const TypePtr& type) {
   return type::fbhive::HiveTypeSerializer::serialize(type);
 }
 
+std::string iobufToString(const folly::IOBuf& buf) {
+  std::string result;
+  result.reserve(buf.computeChainDataLength());
+
+  for (auto range : buf) {
+    result.append(reinterpret_cast<const char*>(range.data()), range.size());
+  }
+
+  return result;
+}
+
 class RemoteFunction : public exec::VectorFunction {
  public:
   RemoteFunction(
       const std::string& functionName,
       const std::vector<exec::VectorFunctionArg>& inputArgs,
       const RemoteVectorFunctionMetadata& metadata)
-      : functionName_(functionName),
-        location_(metadata.location),
-        thriftClient_(getThriftClient(location_, &eventBase_)),
-        serdeFormat_(metadata.serdeFormat),
-        serde_(getSerde(serdeFormat_)) {
+      : functionName_(functionName), metadata_(metadata) {
+    if (metadata.location.type() == typeid(SocketAddress)) {
+      location_ = boost::get<SocketAddress>(metadata.location);
+      thriftClient_ = getThriftClient(location_, &eventBase_);
+    } else if (metadata.location.type() == typeid(URL)) {
+      url_ = boost::get<URL>(metadata.location);
+    }
+
     std::vector<TypePtr> types;
     types.reserve(inputArgs.size());
     serializedInputTypes_.reserve(inputArgs.size());
@@ -62,7 +77,11 @@ class RemoteFunction : public exec::VectorFunction {
       exec::EvalCtx& context,
       VectorPtr& result) const override {
     try {
-      applyRemote(rows, args, outputType, context, result);
+      if ((metadata_.location.type() == typeid(SocketAddress))) {
+        applyRemote(rows, args, outputType, context, result);
+      } else if (metadata_.location.type() == typeid(URL)) {
+        applyRestRemote(rows, args, outputType, context, result);
+      }
     } catch (const VeloxRuntimeError&) {
       throw;
     } catch (const std::exception&) {
@@ -71,6 +90,88 @@ class RemoteFunction : public exec::VectorFunction {
   }
 
  private:
+  void applyRestRemote(
+      const SelectivityVector& rows,
+      std::vector<VectorPtr>& args,
+      const TypePtr& outputType,
+      exec::EvalCtx& context,
+      VectorPtr& result) const {
+    try {
+      std::string responseBody;
+
+      // Create a RowVector for the remote function call
+      auto remoteRowVector = std::make_shared<RowVector>(
+          context.pool(),
+          remoteInputType_,
+          BufferPtr{},
+          rows.end(),
+          std::move(args));
+
+      // Build the JSON request with function and input details
+      folly::dynamic remoteFunctionHandle = folly::dynamic::object;
+      remoteFunctionHandle["functionName"] = functionName_;
+      remoteFunctionHandle["returnType"] = serializeType(outputType);
+      remoteFunctionHandle["argumentTypes"] = folly::dynamic::array;
+      for (const auto& value : serializedInputTypes_) {
+        remoteFunctionHandle["argumentTypes"].push_back(value);
+      }
+
+      folly::dynamic inputs = folly::dynamic::object;
+      inputs["pageFormat"] = static_cast<int>(metadata_.serdeFormat);
+      inputs["payload"] = iobufToString(rowVectorToIOBuf(
+          remoteRowVector,
+          rows.end(),
+          *context.pool(),
+          getSerde(metadata_.serdeFormat).get()));
+      inputs["rowCount"] = remoteRowVector->size();
+
+      // Create the final JSON object to be sent
+      folly::dynamic jsonObject = folly::dynamic::object;
+      jsonObject["remoteFunctionHandle"] = remoteFunctionHandle;
+      jsonObject["inputs"] = inputs;
+      jsonObject["throwOnError"] = context.throwOnError();
+
+      // Construct the full URL for the REST request
+      std::string fullUrl = fmt::format(
+          "{}/v1/functions/{}/{}/{}/{}",
+          url_.getUrl(),
+          metadata_.schema.value_or("default_schema"),
+          functionName_,
+          metadata_.functionId.value_or("default_function_id"),
+          metadata_.version.value_or("default_version"));
+
+      // Invoke the remote function using RestClient
+      RestClient restClient_(fullUrl);
+      restClient_.invoke_function(folly::toJson(jsonObject), responseBody);
+      LOG(INFO) << responseBody;
+
+      // Parse the JSON response
+      auto responseJsonObj = parseJson(responseBody);
+      if (responseJsonObj.count("err") > 0) {
+        VELOX_NYI(responseJsonObj["err"].asString());
+      }
+
+      // Deserialize the result payload
+      auto payloadIObuf = folly::IOBuf::copyBuffer(
+          responseJsonObj["result"]["payload"].asString());
+
+      auto outputRowVector = IOBufToRowVector(
+          *payloadIObuf,
+          ROW({outputType}),
+          *context.pool(),
+          getSerde(metadata_.serdeFormat).get());
+      result = outputRowVector->childAt(0);
+
+    } catch (const std::exception& e) {
+      // Log and throw an error if the remote call fails
+      VELOX_FAIL(
+          "Error while executing remote function '{}' at '{}': {}",
+          functionName_,
+          url_.getUrl(),
+          e.what());
+    }
+  }
+
   void applyRemote(
       const SelectivityVector& rows,
       std::vector<VectorPtr>& args,
@@ -97,11 +198,14 @@ class RemoteFunction : public exec::VectorFunction {
 
     auto requestInputs = request.inputs_ref();
     requestInputs->rowCount_ref() = remoteRowVector->size();
-    requestInputs->pageFormat_ref() = serdeFormat_;
+    requestInputs->pageFormat_ref() = metadata_.serdeFormat;
 
     // TODO: serialize only active rows.
     requestInputs->payload_ref() = rowVectorToIOBuf(
-        remoteRowVector, rows.end(), *context.pool(), serde_.get());
+        remoteRowVector,
+        rows.end(),
+        *context.pool(),
+        getSerde(metadata_.serdeFormat).get());
 
     try {
       thriftClient_->sync_invokeFunction(remoteResponse, request);
@@ -117,21 +221,23 @@ class RemoteFunction : public exec::VectorFunction {
         remoteResponse.get_result().get_payload(),
         ROW({outputType}),
         *context.pool(),
-        serde_.get());
+        getSerde(metadata_.serdeFormat).get());
     result = outputRowVector->childAt(0);
   }
 
   const std::string functionName_;
-  folly::SocketAddress location_;
 
   folly::EventBase eventBase_;
   std::unique_ptr<RemoteFunctionClient> thriftClient_;
-  remote::PageFormat serdeFormat_;
-  std::unique_ptr<VectorSerde> serde_;
+  folly::SocketAddress location_;
+
+  proxygen::URL url_;
 
   // Structures we construct once to cache:
   RowTypePtr remoteInputType_;
   std::vector<std::string> serializedInputTypes_;
+
+  const RemoteVectorFunctionMetadata metadata_;
 };
 
 std::shared_ptr<exec::VectorFunction> createRemoteFunction(

velox/functions/remote/client/Remote.h

@@ -16,20 +16,38 @@
 
 #pragma once
 
+#include <boost/variant.hpp>
 #include <folly/SocketAddress.h>
+#include <proxygen/lib/utils/URL.h>
 #include "velox/expression/VectorFunction.h"
 #include "velox/functions/remote/if/gen-cpp2/RemoteFunction_types.h"
 
 namespace facebook::velox::functions {
 
 struct RemoteVectorFunctionMetadata : public exec::VectorFunctionMetadata {
-  /// Network address of the servr to communicate with. Note that this can hold
-  /// a network location (ip/port pair) or a unix domain socket path (see
+  /// URL of the HTTP/REST server for remote function.
+  /// Or Network address of the servr to communicate with. Note that this can
+  /// hold a network location (ip/port pair) or a unix domain socket path (see
   /// SocketAddress::makeFromPath()).
-  folly::SocketAddress location;
+  boost::variant<folly::SocketAddress, proxygen::URL> location;
 
-  /// The serialization format to be used
+  /// The serialization format to be used when sending data to the remote.
   remote::PageFormat serdeFormat{remote::PageFormat::PRESTO_PAGE};
+
+  /// Optional schema defining the structure of the data or input/output types
+  /// involved in the remote function. This may include details such as column
+  /// names and data types.
+  std::optional<std::string> schema;
+
+  /// Optional identifier for the specific remote function to be invoked.
+  /// This can be useful when the same server hosts multiple functions,
+  /// and the client needs to specify which function to call.
+  std::optional<std::string> functionId;
+
+  /// Optional version information to be used when calling the remote function.
+  /// This can help in ensuring compatibility with a particular version of the
+  /// function if multiple versions are available on the server.
+  std::optional<std::string> version;
 };
 
 /// Registers a new remote function. It will use the meatadata defined in
@@ -38,8 +56,8 @@ struct RemoteVectorFunctionMetadata : public exec::VectorFunctionMetadata {
 //
 /// Remote functions are registered as regular statufull functions (using the
 /// same internal catalog), and hence conflict if there already exists a
-/// (non-remote) function registered with the same name. The `overwrite` flag
-/// controls whether to overwrite in these cases.
+/// (non-remote) function registered with the same name. The `overwrite`
+/// flagwrite controls whether to overwrite in these cases.
 void registerRemoteFunction(
     const std::string& name,
     std::vector<exec::FunctionSignaturePtr> signatures,

velox/functions/remote/client/RestClient.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * 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.
+ */
+#include "velox/functions/remote/client/RestClient.h"
+#include <proxygen/lib/utils/URL.h>
+
+using namespace facebook::velox::functions;
+
+namespace facebook::velox::functions {
+
+RestClient::RestClient(const std::string& url) : url_(url) {
+  httpClient_ = std::make_shared<HttpClient>(url_);
+};
+
+void RestClient::invoke_function(
+    const std::string& requestBody,
+    std::string& responseBody) {
+  httpClient_->send(requestBody);
+  responseBody = httpClient_->getResponseBody();
+  LOG(INFO) << responseBody;
+};
+
+} // namespace facebook::velox::functions