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1 | /* |
2 | * This file is open source software, licensed to you under the terms | |
3 | * of the Apache License, Version 2.0 (the "License"). See the NOTICE file | |
4 | * distributed with this work for additional information regarding copyright | |
5 | * ownership. You may not use this file except in compliance with the License. | |
6 | * | |
7 | * You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, | |
12 | * software distributed under the License is distributed on an | |
13 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | * KIND, either express or implied. See the License for the | |
15 | * specific language governing permissions and limitations | |
16 | * under the License. | |
17 | */ | |
18 | /* | |
19 | * Copyright (C) 2021 ScyllaDB | |
20 | */ | |
21 | ||
22 | #include <seastar/core/future.hh> | |
23 | #include <seastar/core/iostream.hh> | |
24 | #include <seastar/core/temporary_buffer.hh> | |
25 | ||
26 | namespace seastar { | |
27 | ||
28 | namespace util { | |
29 | ||
30 | future<std::vector<temporary_buffer<char>>> read_entire_stream(input_stream<char>& inp) { | |
31 | using tmp_buf = temporary_buffer<char>; | |
32 | using consumption_result_type = consumption_result<char>; | |
33 | return do_with(std::vector<tmp_buf>(), [&inp] (std::vector<tmp_buf>& bufs) { | |
34 | return inp.consume([&bufs] (tmp_buf buf) { | |
35 | if (buf.empty()) { | |
36 | return make_ready_future<consumption_result_type>(stop_consuming(std::move(buf))); | |
37 | } | |
38 | bufs.push_back(std::move(buf)); | |
39 | return make_ready_future<consumption_result_type>(continue_consuming()); | |
40 | }).then([&bufs] { | |
41 | return std::move(bufs); | |
42 | }); | |
43 | }); | |
44 | } | |
45 | ||
46 | future<sstring> read_entire_stream_contiguous(input_stream<char>& inp) { | |
47 | return read_entire_stream(inp).then([] (std::vector<temporary_buffer<char>> bufs) { | |
48 | size_t total_size = 0; | |
49 | for (auto&& buf : bufs) { | |
50 | total_size += buf.size(); | |
51 | } | |
52 | sstring ret(sstring::initialized_later(), total_size); | |
53 | size_t pos = 0; | |
54 | for (auto&& buf : bufs) { | |
55 | std::copy(buf.begin(), buf.end(), ret.data() + pos); | |
56 | pos += buf.size(); | |
57 | } | |
58 | return ret; | |
59 | }); | |
60 | }; | |
61 | ||
62 | future<> skip_entire_stream(input_stream<char>& inp) { | |
63 | return inp.consume([] (temporary_buffer<char> tmp) { | |
64 | return tmp.empty() ? make_ready_future<consumption_result<char>>(stop_consuming(temporary_buffer<char>())) | |
65 | : make_ready_future<consumption_result<char>>(continue_consuming()); | |
66 | }); | |
67 | } | |
68 | ||
69 | } | |
70 | ||
71 | } |