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Add support for REST based remote functions
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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> | ||
|
|
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| using namespace facebook::velox::functions; | ||
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|
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| namespace facebook::velox::functions { | ||
|
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| RestClient::RestClient(const std::string& url) : url_(url) { | ||
| httpClient_ = std::make_shared<HttpClient>(url_); | ||
| }; | ||
|
|
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| void RestClient::invoke_function( | ||
| const std::string& requestBody, | ||
| std::string& responseBody) { | ||
| httpClient_->send(requestBody); | ||
| responseBody = httpClient_->getResponseBody(); | ||
| LOG(INFO) << responseBody; | ||
| }; | ||
|
|
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| } // namespace facebook::velox::functions |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
||
| #pragma once | ||
|
|
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| #include <folly/init/Init.h> | ||
| #include <folly/io/async/EventBase.h> | ||
| #include <folly/io/async/EventBaseManager.h> | ||
| #include <folly/io/async/SSLContext.h> | ||
| #include <folly/json.h> | ||
| #include <proxygen/lib/http/HTTPConnector.h> | ||
| #include <proxygen/lib/http/HTTPMessage.h> | ||
| #include <proxygen/lib/http/session/HTTPUpstreamSession.h> | ||
| #include <proxygen/lib/utils/URL.h> | ||
| #include "velox/functions/remote/client/RestClient.h" | ||
|
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| using namespace proxygen; | ||
| using namespace folly; | ||
|
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| namespace facebook::velox::functions { | ||
|
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| class HttpClient : public HTTPConnector::Callback, | ||
| public HTTPTransactionHandler { | ||
| public: | ||
| HttpClient(const URL& url) : url_(url) {} | ||
|
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| void send(std::string requestBody) { | ||
| requestBody_ = requestBody; | ||
| connector_ = std::make_unique<proxygen::HTTPConnector>( | ||
| this, WheelTimerInstance(std::chrono::milliseconds(1000))); | ||
| connector_->connect( | ||
| &evb_, | ||
| SocketAddress(url_.getHost(), url_.getPort(), true), | ||
| std::chrono::milliseconds(10000)); | ||
| evb_.loop(); | ||
| } | ||
|
|
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| std::string getResponseBody() { | ||
| return std::move(responseBody_); | ||
| } | ||
|
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| private: | ||
| URL url_; | ||
| EventBase evb_; | ||
| std::unique_ptr<HTTPConnector> connector_; | ||
| std::shared_ptr<HTTPUpstreamSession> session_; | ||
| std::string requestBody_; | ||
| std::string responseBody_; | ||
|
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| void connectSuccess(HTTPUpstreamSession* session) noexcept override { | ||
| session_ = std::shared_ptr<HTTPUpstreamSession>( | ||
| session, [](HTTPUpstreamSession* s) { | ||
| // No-op deleter, managed by Proxygen | ||
| }); | ||
| sendRequest(); | ||
| } | ||
|
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| void connectError(const folly::AsyncSocketException& ex) noexcept override { | ||
| LOG(ERROR) << "Failed to connect: " << ex.what(); | ||
| evb_.terminateLoopSoon(); | ||
| } | ||
|
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| void sendRequest() { | ||
| auto txn = session_->newTransaction(this); | ||
| HTTPMessage req; | ||
| req.setMethod(HTTPMethod::POST); | ||
| req.setURL(url_.getUrl()); | ||
| req.getHeaders().add(HTTP_HEADER_CONTENT_TYPE, "application/json"); | ||
| req.getHeaders().add( | ||
| HTTP_HEADER_CONTENT_LENGTH, std::to_string(requestBody_.size())); | ||
| req.getHeaders().add(HTTP_HEADER_USER_AGENT, "Velox HTTPClient"); | ||
|
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| txn->sendHeaders(req); | ||
| txn->sendBody(folly::IOBuf::copyBuffer(requestBody_)); | ||
| txn->sendEOM(); | ||
| } | ||
|
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| void setTransaction(HTTPTransaction*) noexcept override {} | ||
| void detachTransaction() noexcept override { | ||
| session_.reset(); | ||
| evb_.terminateLoopSoon(); | ||
| } | ||
|
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| void onHeadersComplete(std::unique_ptr<HTTPMessage> msg) noexcept override {} | ||
|
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| void onBody(std::unique_ptr<folly::IOBuf> chain) noexcept override { | ||
| if (chain) { | ||
| responseBody_.append( | ||
| reinterpret_cast<const char*>(chain->data()), chain->length()); | ||
| } | ||
| } | ||
|
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| void onEOM() noexcept override { | ||
| session_->drain(); | ||
| } | ||
|
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| void onError(const HTTPException& error) noexcept override { | ||
| LOG(ERROR) << "Error: " << error.what(); | ||
| } | ||
| void onUpgrade(UpgradeProtocol) noexcept override {} | ||
| void onTrailers(std::unique_ptr<HTTPHeaders>) noexcept override {} | ||
| void onEgressPaused() noexcept override {} | ||
| void onEgressResumed() noexcept override {} | ||
| }; | ||
|
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| class RestClient { | ||
| public: | ||
| RestClient(const std::string& url); | ||
| void invoke_function(const std::string& request, std::string& response); | ||
|
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| private: | ||
| URL url_; | ||
| std::shared_ptr<HttpClient> httpClient_; | ||
| }; | ||
|
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| } // namespace facebook::velox::functions |
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