1 /*
2  * Copyright (c) Facebook, Inc. and its affiliates.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <folly/logging/FileWriterFactory.h>
18 
19 #include <folly/Conv.h>
20 #include <folly/File.h>
21 #include <folly/logging/AsyncFileWriter.h>
22 #include <folly/logging/ImmediateFileWriter.h>
23 
24 using std::make_shared;
25 using std::string;
26 
27 namespace folly {
28 
processOption(StringPiece name,StringPiece value)29 bool FileWriterFactory::processOption(StringPiece name, StringPiece value) {
30   if (name == "async") {
31     async_ = to<bool>(value);
32     return true;
33   } else if (name == "max_buffer_size") {
34     auto size = to<size_t>(value);
35     if (size == 0) {
36       throw std::invalid_argument(to<string>("must be a positive integer"));
37     }
38     maxBufferSize_ = size;
39     return true;
40   } else {
41     return false;
42   }
43 }
44 
createWriter(File file)45 std::shared_ptr<LogWriter> FileWriterFactory::createWriter(File file) {
46   // Determine whether we should use ImmediateFileWriter or AsyncFileWriter
47   if (async_) {
48     auto asyncWriter = make_shared<AsyncFileWriter>(std::move(file));
49     if (maxBufferSize_.has_value()) {
50       asyncWriter->setMaxBufferSize(maxBufferSize_.value());
51     }
52     return asyncWriter;
53   } else {
54     if (maxBufferSize_.has_value()) {
55       throw std::invalid_argument(to<string>(
56           "the \"max_buffer_size\" option is only valid for async file "
57           "handlers"));
58     }
59     return make_shared<ImmediateFileWriter>(std::move(file));
60   }
61 }
62 
63 } // namespace folly
64