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// Copyright 2023 Huawei Cloud Computing Technology Co., Ltd.
//
// 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.
#ifndef INCLUDED_SRC_OTHER_TOOLS_UTILS_CONTENT_HPP
#define INCLUDED_SRC_OTHER_TOOLS_UTILS_CONTENT_HPP
#include <optional>
#include <string>
#include <variant>
#include "src/buildtool/common/user_structs.hpp"
#include "src/buildtool/crypto/hasher.hpp"
#include "src/buildtool/logging/log_level.hpp"
#include "src/other_tools/just_mr/mirrors.hpp"
#include "src/other_tools/utils/curl_easy_handle.hpp"
#include "src/other_tools/utils/curl_url_handle.hpp"
// Utilities related to the content of an archive
/// \brief Fetches a file from the internet and stores its content in memory.
/// \returns the content.
[[nodiscard]] static auto NetworkFetch(std::string const& fetch_url,
CAInfoPtr const& ca_info) noexcept
-> std::optional<std::string> {
auto curl_handle = CurlEasyHandle::Create(
ca_info->no_ssl_verify, ca_info->ca_bundle, LogLevel::Debug);
if (not curl_handle) {
return std::nullopt;
}
return curl_handle->DownloadToString(fetch_url);
}
/// \brief Fetches a file from the internet and stores its content in memory.
/// Tries not only a given remote, but also all associated remote locations.
/// \returns An error + data union, with the error message at index 0 and the
/// fetched data at index 1.
[[nodiscard]] static auto NetworkFetchWithMirrors(
std::string const& fetch_url,
std::vector<std::string> const& mirrors,
CAInfoPtr const& ca_info,
MirrorsPtr const& additional_mirrors) noexcept
-> std::variant<std::string, std::string> {
// keep all remotes tried, to report in case fetch fails
std::string remotes_buffer{};
// first, try the local mirrors
std::optional<std::string> data{std::nullopt};
auto local_mirrors =
MirrorsUtils::GetLocalMirrors(additional_mirrors, fetch_url);
for (auto const& mirror : local_mirrors) {
if (data = NetworkFetch(mirror, ca_info); data) {
break;
}
// add local mirror to buffer
remotes_buffer.append(fmt::format("\n> {}", mirror));
}
if (not data) {
// get preferred hostnames list
auto preferred_hostnames =
MirrorsUtils::GetPreferredHostnames(additional_mirrors);
// try the main fetch URL, but with each of the preferred hostnames
for (auto const& hostname : preferred_hostnames) {
if (auto preferred_url =
CurlURLHandle::ReplaceHostname(fetch_url, hostname)) {
if (data = NetworkFetch(*preferred_url, ca_info); data) {
break;
}
// add preferred URL to buffer
remotes_buffer.append(fmt::format("\n> {}", *preferred_url));
}
else {
// report failed hostname
remotes_buffer.append(
fmt::format("\n> {} (failed hostname replace: {})",
fetch_url,
hostname));
}
}
if (not data) {
// now try the main fetch URL
if (data = NetworkFetch(fetch_url, ca_info); not data) {
// add main fetch URL to buffer
remotes_buffer.append(fmt::format("\n> {}", fetch_url));
// try the mirrors, in order, if given
for (auto const& mirror : mirrors) {
// first use with preferred hostnames...
for (auto const& hostname : preferred_hostnames) {
if (auto preferred_mirror =
CurlURLHandle::ReplaceHostname(mirror,
hostname)) {
if (data = NetworkFetch(*preferred_mirror, ca_info);
data) {
break;
}
// add preferred mirror to buffer
remotes_buffer.append(
fmt::format("\n> {}", *preferred_mirror));
}
else {
// report failed hostname
remotes_buffer.append(fmt::format(
"\n> {} (failed hostname replace: {})",
mirror,
hostname));
}
}
// ...then the original mirror
if (not data) {
if (data = NetworkFetch(mirror, ca_info); data) {
break;
}
// add mirror to buffer
remotes_buffer.append(fmt::format("\n> {}", mirror));
}
}
}
}
}
return data ? std::variant<std::string, std::string>(std::in_place_index<1>,
*data)
: std::variant<std::string, std::string>(std::in_place_index<0>,
remotes_buffer);
}
template <Hasher::HashType type>
[[nodiscard]] static auto GetContentHash(std::string const& data) noexcept
-> std::string {
Hasher hasher{type};
hasher.Update(data);
auto digest = std::move(hasher).Finalize();
return digest.HexString();
}
#endif // INCLUDED_SRC_OTHER_TOOLS_UTILS_CONTENT_HPP
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