2 * Copyright 2017 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
22 #include <folly/Range.h>
23 #include <folly/ScopeGuard.h>
24 #include <folly/experimental/io/FsUtil.h>
32 * By default, the file is created in a system-specific location (the value
33 * of the TMPDIR environment variable, or /tmp), but you can override that
34 * with a different (non-empty) directory passed to the constructor.
36 * By default, the file is closed and deleted when the TemporaryFile object
37 * is destroyed, but both these behaviors can be overridden with arguments
47 explicit TemporaryFile(StringPiece namePrefix = StringPiece(),
48 fs::path dir = fs::path(),
49 Scope scope = Scope::UNLINK_ON_DESTRUCTION,
50 bool closeOnDestruction = true);
53 // Movable, but not copiable
54 TemporaryFile(TemporaryFile&&) = default;
55 TemporaryFile& operator=(TemporaryFile&&) = default;
57 int fd() const { return fd_; }
58 const fs::path& path() const;
62 bool closeOnDestruction_;
68 * Temporary directory.
70 * By default, the temporary directory is created in a system-specific
71 * location (the value of the TMPDIR environment variable, or /tmp), but you
72 * can override that with a non-empty directory passed to the constructor.
74 * By default, the directory is recursively deleted when the TemporaryDirectory
75 * object is destroyed, but that can be overridden with an argument
79 class TemporaryDirectory {
85 explicit TemporaryDirectory(StringPiece namePrefix = StringPiece(),
86 fs::path dir = fs::path(),
87 Scope scope = Scope::DELETE_ON_DESTRUCTION);
88 ~TemporaryDirectory();
90 // Movable, but not copiable
91 TemporaryDirectory(TemporaryDirectory&&) = default;
92 TemporaryDirectory& operator=(TemporaryDirectory&&) = default;
94 const fs::path& path() const {
100 std::unique_ptr<fs::path> path_;
104 * Changes into a temporary directory, and deletes it with all its contents
105 * upon destruction, also changing back to the original working directory.
107 class ChangeToTempDir {
112 // Movable, but not copiable
113 ChangeToTempDir(ChangeToTempDir&&) = default;
114 ChangeToTempDir& operator=(ChangeToTempDir&&) = default;
116 const fs::path& path() const { return dir_.path(); }
119 fs::path initialPath_;
120 TemporaryDirectory dir_;
125 void* previousThreadLocalHandler;
126 int previousCrtReportMode;
128 SavedState disableInvalidParameters();
129 void enableInvalidParameters(SavedState state);
132 // Ok, so fun fact: The CRT on windows will actually abort
133 // on certain failed parameter validation checks in debug
134 // mode rather than simply returning -1 as it does in release
135 // mode. We can however, ensure consistent behavior by
136 // registering our own thread-local invalid parameter handler
137 // for the duration of the call, and just have that handler
138 // immediately return. We also have to disable CRT asertion
139 // alerts for the duration of the call, otherwise we get
140 // the abort-retry-ignore window.
141 template <typename Func>
142 auto msvcSuppressAbortOnInvalidParams(Func func) -> decltype(func()) {
143 auto savedState = detail::disableInvalidParameters();
145 detail::enableInvalidParameters(savedState);
151 * Easy PCRE regex matching. Note that pattern must match the ENTIRE target,
152 * so use .* at the start and end of the pattern, as appropriate. See
153 * http://regex101.com/ for a PCRE simulator.
155 #define EXPECT_PCRE_MATCH(pattern_stringpiece, target_stringpiece) \
157 ::folly::test::detail::hasPCREPatternMatch, \
158 pattern_stringpiece, \
161 #define EXPECT_NO_PCRE_MATCH(pattern_stringpiece, target_stringpiece) \
163 ::folly::test::detail::hasNoPCREPatternMatch, \
164 pattern_stringpiece, \
169 bool hasPCREPatternMatch(StringPiece pattern, StringPiece target);
170 bool hasNoPCREPatternMatch(StringPiece pattern, StringPiece target);
171 } // namespace detail
174 * Use these patterns together with CaptureFD and EXPECT_PCRE_MATCH() to
175 * test for the presence (or absence) of log lines at a particular level:
177 * CaptureFD stderr(2);
178 * LOG(INFO) << "All is well";
179 * EXPECT_NO_PCRE_MATCH(glogErrOrWarnPattern(), stderr.readIncremental());
180 * LOG(ERROR) << "Uh-oh";
181 * EXPECT_PCRE_MATCH(glogErrorPattern(), stderr.readIncremental());
183 inline std::string glogErrorPattern() { return ".*(^|\n)E[0-9].*"; }
184 inline std::string glogWarningPattern() { return ".*(^|\n)W[0-9].*"; }
186 inline std::string glogErrOrWarnPattern() { return ".*(^|\n)[EW][0-9].*"; }
189 * Temporarily capture a file descriptor by redirecting it into a file.
190 * You can consume its entire output thus far via read(), incrementally
191 * via readIncremental(), or via callback using chunk_cob.
192 * Great for testing logging (see also glog*Pattern()).
196 struct NoOpChunkCob { void operator()(StringPiece) {} };
198 using ChunkCob = std::function<void(folly::StringPiece)>;
201 * chunk_cob is is guaranteed to consume all the captured output. It is
202 * invoked on each readIncremental(), and also on FD release to capture
203 * as-yet unread lines. Chunks can be empty.
205 explicit CaptureFD(int fd, ChunkCob chunk_cob = NoOpChunkCob());
209 * Restore the captured FD to its original state. It can be useful to do
210 * this before the destructor so that you can read() the captured data and
211 * log about it to the formerly captured stderr or stdout.
216 * Reads the whole file into a string, but does not remove the redirect.
218 std::string read() const;
221 * Read any bytes that were appended to the file since the last
222 * readIncremental. Great for testing line-by-line output.
224 std::string readIncremental();
231 int oldFDCopy_; // equal to fd_ after restore()
233 off_t readOffset_; // for incremental reading