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feat(functions): Add support for REST based remote functions
Co-authored-by: Wills Feng <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * 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. | ||
| */ | ||
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| #include "velox/functions/remote/client/RestClient.h" | ||
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| #include <curl/curl.h> | ||
| #include <folly/io/IOBufQueue.h> | ||
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| #include "velox/common/base/Exceptions.h" | ||
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| using namespace folly; | ||
| namespace facebook::velox::functions { | ||
| namespace { | ||
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| // Callback function for CURL to read data from the request payload. | ||
| // @param dest Destination buffer to copy data into. | ||
| // @param size Size of each data element. | ||
| // @param nmemb Number of elements to read. | ||
| // @param userp Pointer to user data (IOBufQueue containing the request | ||
| // payload). | ||
| // @return Number of bytes actually copied. | ||
| size_t readCallback(char* dest, size_t size, size_t nmemb, void* userp) { | ||
| auto* inputBufQueue = static_cast<IOBufQueue*>(userp); | ||
| size_t bufferSize = size * nmemb; | ||
| size_t totalCopied = 0; | ||
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| while (totalCopied < bufferSize && !inputBufQueue->empty()) { | ||
| auto buf = inputBufQueue->front(); | ||
| size_t remainingSize = bufferSize - totalCopied; | ||
| size_t copySize = std::min(remainingSize, buf->length()); | ||
| std::memcpy(dest + totalCopied, buf->data(), copySize); | ||
| totalCopied += copySize; | ||
| inputBufQueue->pop_front(); | ||
| } | ||
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| return totalCopied; | ||
| } | ||
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| // Callback function for CURL to write data to the response payload. | ||
| // @param ptr Pointer to the received data. | ||
| // @param size Size of each data element. | ||
| // @param nmemb Number of elements received. | ||
| // @param userData Pointer to user data (IOBufQueue to store the response | ||
| // payload). | ||
| // @return Number of bytes actually written. | ||
| size_t writeCallback(char* ptr, size_t size, size_t nmemb, void* userData) { | ||
| auto* outputBuf = static_cast<IOBufQueue*>(userData); | ||
| size_t totalSize = size * nmemb; | ||
| auto buf = IOBuf::copyBuffer(ptr, totalSize); | ||
| outputBuf->append(std::move(buf)); | ||
| return totalSize; | ||
| } | ||
| } // namespace | ||
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| std::unique_ptr<IOBuf> RestClient::invokeFunction( | ||
| const std::string& fullUrl, | ||
| std::unique_ptr<IOBuf> requestPayload) { | ||
| try { | ||
| IOBufQueue inputBufQueue(IOBufQueue::cacheChainLength()); | ||
| inputBufQueue.append(std::move(requestPayload)); | ||
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| CURL* curl = curl_easy_init(); | ||
| if (!curl) { | ||
| VELOX_FAIL(fmt::format( | ||
| "Error initializing CURL: {}", | ||
| curl_easy_strerror(CURLE_FAILED_INIT))); | ||
| } | ||
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| curl_easy_setopt(curl, CURLOPT_URL, fullUrl.c_str()); | ||
| curl_easy_setopt(curl, CURLOPT_POST, 1L); | ||
| curl_easy_setopt(curl, CURLOPT_READFUNCTION, readCallback); | ||
| curl_easy_setopt(curl, CURLOPT_READDATA, &inputBufQueue); | ||
| curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback); | ||
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| IOBufQueue outputBuf(IOBufQueue::cacheChainLength()); | ||
| curl_easy_setopt(curl, CURLOPT_WRITEDATA, &outputBuf); | ||
| curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); | ||
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| struct curl_slist* headers = nullptr; | ||
| headers = | ||
| curl_slist_append(headers, "Content-Type: application/X-presto-pages"); | ||
| headers = curl_slist_append(headers, "Accept: application/X-presto-pages"); | ||
| curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); | ||
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| curl_easy_setopt( | ||
| curl, | ||
| CURLOPT_POSTFIELDSIZE, | ||
| static_cast<long>(inputBufQueue.chainLength())); | ||
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| CURLcode res = curl_easy_perform(curl); | ||
| if (res != CURLE_OK) { | ||
| curl_slist_free_all(headers); | ||
| curl_easy_cleanup(curl); | ||
| VELOX_FAIL(fmt::format( | ||
| "Error communicating with server: {}\nURL: {}\nCURL Error: {}", | ||
| curl_easy_strerror(res), | ||
| fullUrl.c_str(), | ||
| curl_easy_strerror(res))); | ||
| } | ||
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| curl_slist_free_all(headers); | ||
| curl_easy_cleanup(curl); | ||
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| return outputBuf.move(); | ||
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| } catch (const std::exception& e) { | ||
| VELOX_FAIL(fmt::format("Exception during CURL request: {}", e.what())); | ||
| } | ||
| } | ||
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| std::unique_ptr<HttpClient> getRestClient() { | ||
| return std::make_unique<RestClient>(); | ||
| } | ||
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| } // namespace facebook::velox::functions |
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