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//===-- llvm/Debuginfod/HTTPClient.cpp - HTTP client library ----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
///
/// This file defines the methods of the HTTPRequest, HTTPClient, and
/// BufferedHTTPResponseHandler classes.
///
//===----------------------------------------------------------------------===//
#include "llvm/Debuginfod/HTTPClient.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MemoryBuffer.h"
#ifdef LLVM_ENABLE_CURL
#error #include <curl/curl.h>
#endif
using namespace llvm;
HTTPRequest::HTTPRequest(StringRef Url) { this->Url = Url.str(); }
bool operator==(const HTTPRequest &A, const HTTPRequest &B) {
return A.Url == B.Url && A.Method == B.Method &&
A.FollowRedirects == B.FollowRedirects;
}
HTTPResponseHandler::~HTTPResponseHandler() = default;
static inline bool parseContentLengthHeader(StringRef LineRef,
size_t &ContentLength) {
// Content-Length is a mandatory header, and the only one we handle.
return LineRef.consume_front("Content-Length: ") &&
to_integer(LineRef.trim(), ContentLength, 10);
}
Error BufferedHTTPResponseHandler::handleHeaderLine(StringRef HeaderLine) {
if (ResponseBuffer.Body)
return Error::success();
size_t ContentLength;
if (parseContentLengthHeader(HeaderLine, ContentLength))
ResponseBuffer.Body =
WritableMemoryBuffer::getNewUninitMemBuffer(ContentLength);
return Error::success();
}
Error BufferedHTTPResponseHandler::handleBodyChunk(StringRef BodyChunk) {
if (!ResponseBuffer.Body)
return createStringError(errc::io_error,
"Unallocated response buffer. HTTP Body data "
"received before Content-Length header.");
if (Offset + BodyChunk.size() > ResponseBuffer.Body->getBufferSize())
return createStringError(errc::io_error,
"Content size exceeds buffer size.");
memcpy(ResponseBuffer.Body->getBufferStart() + Offset, BodyChunk.data(),
BodyChunk.size());
Offset += BodyChunk.size();
return Error::success();
}
Error BufferedHTTPResponseHandler::handleStatusCode(unsigned Code) {
ResponseBuffer.Code = Code;
return Error::success();
}
bool HTTPClient::IsInitialized = false;
class HTTPClientCleanup {
public:
~HTTPClientCleanup() { HTTPClient::cleanup(); }
};
static const HTTPClientCleanup Cleanup;
Expected<HTTPResponseBuffer> HTTPClient::perform(const HTTPRequest &Request) {
BufferedHTTPResponseHandler Handler;
if (Error Err = perform(Request, Handler))
return std::move(Err);
return std::move(Handler.ResponseBuffer);
}
Expected<HTTPResponseBuffer> HTTPClient::get(StringRef Url) {
HTTPRequest Request(Url);
return perform(Request);
}
#ifdef LLVM_ENABLE_CURL
bool HTTPClient::isAvailable() { return true; }
void HTTPClient::initialize() {
if (!IsInitialized) {
curl_global_init(CURL_GLOBAL_ALL);
IsInitialized = true;
}
}
void HTTPClient::cleanup() {
if (IsInitialized) {
curl_global_cleanup();
IsInitialized = false;
}
}
void HTTPClient::setTimeout(std::chrono::milliseconds Timeout) {
if (Timeout < std::chrono::milliseconds(0))
Timeout = std::chrono::milliseconds(0);
curl_easy_setopt(Curl, CURLOPT_TIMEOUT_MS, Timeout.count());
}
/// CurlHTTPRequest and the curl{Header,Write}Function are implementation
/// details used to work with Curl. Curl makes callbacks with a single
/// customizable pointer parameter.
struct CurlHTTPRequest {
CurlHTTPRequest(HTTPResponseHandler &Handler) : Handler(Handler) {}
void storeError(Error Err) {
ErrorState = joinErrors(std::move(Err), std::move(ErrorState));
}
HTTPResponseHandler &Handler;
llvm::Error ErrorState = Error::success();
};
static size_t curlHeaderFunction(char *Contents, size_t Size, size_t NMemb,
CurlHTTPRequest *CurlRequest) {
assert(Size == 1 && "The Size passed by libCURL to CURLOPT_HEADERFUNCTION "
"should always be 1.");
if (Error Err =
CurlRequest->Handler.handleHeaderLine(StringRef(Contents, NMemb))) {
CurlRequest->storeError(std::move(Err));
return 0;
}
return NMemb;
}
static size_t curlWriteFunction(char *Contents, size_t Size, size_t NMemb,
CurlHTTPRequest *CurlRequest) {
Size *= NMemb;
if (Error Err =
CurlRequest->Handler.handleBodyChunk(StringRef(Contents, Size))) {
CurlRequest->storeError(std::move(Err));
return 0;
}
return Size;
}
HTTPClient::HTTPClient() {
assert(IsInitialized &&
"Must call HTTPClient::initialize() at the beginning of main().");
if (Curl)
return;
Curl = curl_easy_init();
assert(Curl && "Curl could not be initialized");
// Set the callback hooks.
curl_easy_setopt(Curl, CURLOPT_WRITEFUNCTION, curlWriteFunction);
curl_easy_setopt(Curl, CURLOPT_HEADERFUNCTION, curlHeaderFunction);
}
HTTPClient::~HTTPClient() { curl_easy_cleanup(Curl); }
Error HTTPClient::perform(const HTTPRequest &Request,
HTTPResponseHandler &Handler) {
if (Request.Method != HTTPMethod::GET)
return createStringError(errc::invalid_argument,
"Unsupported CURL request method.");
SmallString<128> Url = Request.Url;
curl_easy_setopt(Curl, CURLOPT_URL, Url.c_str());
curl_easy_setopt(Curl, CURLOPT_FOLLOWLOCATION, Request.FollowRedirects);
CurlHTTPRequest CurlRequest(Handler);
curl_easy_setopt(Curl, CURLOPT_WRITEDATA, &CurlRequest);
curl_easy_setopt(Curl, CURLOPT_HEADERDATA, &CurlRequest);
CURLcode CurlRes = curl_easy_perform(Curl);
if (CurlRes != CURLE_OK)
return joinErrors(std::move(CurlRequest.ErrorState),
createStringError(errc::io_error,
"curl_easy_perform() failed: %s\n",
curl_easy_strerror(CurlRes)));
if (CurlRequest.ErrorState)
return std::move(CurlRequest.ErrorState);
unsigned Code;
curl_easy_getinfo(Curl, CURLINFO_RESPONSE_CODE, &Code);
if (Error Err = Handler.handleStatusCode(Code))
return joinErrors(std::move(CurlRequest.ErrorState), std::move(Err));
return std::move(CurlRequest.ErrorState);
}
#else
HTTPClient::HTTPClient() = default;
HTTPClient::~HTTPClient() = default;
bool HTTPClient::isAvailable() { return false; }
void HTTPClient::initialize() {}
void HTTPClient::cleanup() {}
void HTTPClient::setTimeout(std::chrono::milliseconds Timeout) {}
Error HTTPClient::perform(const HTTPRequest &Request,
HTTPResponseHandler &Handler) {
llvm_unreachable("No HTTP Client implementation available.");
}
#endif
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