1 //
2 // Copyright 2022 The Abseil Authors.
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 // https://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 #include "absl/log/internal/flags.h"
17
18 #include <stddef.h>
19
20 #include <algorithm>
21 #include <cstdlib>
22 #include <string>
23
24 #include "absl/base/attributes.h"
25 #include "absl/base/config.h"
26 #include "absl/base/log_severity.h"
27 #include "absl/flags/flag.h"
28 #include "absl/flags/marshalling.h"
29 #include "absl/log/globals.h"
30 #include "absl/log/internal/config.h"
31 #include "absl/log/internal/vlog_config.h"
32 #include "absl/strings/numbers.h"
33 #include "absl/strings/string_view.h"
34
35 namespace absl {
36 ABSL_NAMESPACE_BEGIN
37 namespace log_internal {
38 namespace {
39
SyncLoggingFlags()40 void SyncLoggingFlags() {
41 absl::SetFlag(&FLAGS_minloglevel, static_cast<int>(absl::MinLogLevel()));
42 absl::SetFlag(&FLAGS_log_prefix, absl::ShouldPrependLogPrefix());
43 }
44
RegisterSyncLoggingFlags()45 bool RegisterSyncLoggingFlags() {
46 log_internal::SetLoggingGlobalsListener(&SyncLoggingFlags);
47 return true;
48 }
49
50 ABSL_ATTRIBUTE_UNUSED const bool unused = RegisterSyncLoggingFlags();
51
52 template <typename T>
GetFromEnv(const char * varname,T dflt)53 T GetFromEnv(const char* varname, T dflt) {
54 const char* val = ::getenv(varname);
55 if (val != nullptr) {
56 std::string err;
57 ABSL_INTERNAL_CHECK(absl::ParseFlag(val, &dflt, &err), err.c_str());
58 }
59 return dflt;
60 }
61
StderrThresholdDefault()62 constexpr absl::LogSeverityAtLeast StderrThresholdDefault() {
63 return absl::LogSeverityAtLeast::kError;
64 }
65
66 } // namespace
67 } // namespace log_internal
68 ABSL_NAMESPACE_END
69 } // namespace absl
70
71 ABSL_FLAG(int, stderrthreshold,
72 static_cast<int>(absl::log_internal::StderrThresholdDefault()),
73 "Log messages at or above this threshold level are copied to stderr.")
__anon2617cab90202null74 .OnUpdate([] {
75 absl::log_internal::RawSetStderrThreshold(
76 static_cast<absl::LogSeverityAtLeast>(
77 absl::GetFlag(FLAGS_stderrthreshold)));
78 });
79
80 ABSL_FLAG(int, minloglevel, static_cast<int>(absl::LogSeverityAtLeast::kInfo),
81 "Messages logged at a lower level than this don't actually "
82 "get logged anywhere")
__anon2617cab90302null83 .OnUpdate([] {
84 absl::log_internal::RawSetMinLogLevel(
85 static_cast<absl::LogSeverityAtLeast>(
86 absl::GetFlag(FLAGS_minloglevel)));
87 });
88
89 ABSL_FLAG(std::string, log_backtrace_at, "",
90 "Emit a backtrace when logging at file:linenum.")
__anon2617cab90402null91 .OnUpdate([] {
92 const std::string log_backtrace_at =
93 absl::GetFlag(FLAGS_log_backtrace_at);
94 if (log_backtrace_at.empty()) {
95 absl::ClearLogBacktraceLocation();
96 return;
97 }
98
99 const size_t last_colon = log_backtrace_at.rfind(':');
100 if (last_colon == log_backtrace_at.npos) {
101 absl::ClearLogBacktraceLocation();
102 return;
103 }
104
105 const absl::string_view file =
106 absl::string_view(log_backtrace_at).substr(0, last_colon);
107 int line;
108 if (!absl::SimpleAtoi(
109 absl::string_view(log_backtrace_at).substr(last_colon + 1),
110 &line)) {
111 absl::ClearLogBacktraceLocation();
112 return;
113 }
114 absl::SetLogBacktraceLocation(file, line);
115 });
116
117 ABSL_FLAG(bool, log_prefix, true,
118 "Prepend the log prefix to the start of each log line")
__anon2617cab90502null119 .OnUpdate([] {
120 absl::log_internal::RawEnableLogPrefix(absl::GetFlag(FLAGS_log_prefix));
121 });
122
123 ABSL_FLAG(int, v, 0,
124 "Show all VLOG(m) messages for m <= this. Overridable by --vmodule.")
__anon2617cab90602null125 .OnUpdate([] {
126 absl::log_internal::UpdateGlobalVLogLevel(absl::GetFlag(FLAGS_v));
127 });
128
129 ABSL_FLAG(
130 std::string, vmodule, "",
131 "per-module log verbosity level."
132 " Argument is a comma-separated list of <module name>=<log level>."
133 " <module name> is a glob pattern, matched against the filename base"
134 " (that is, name ignoring .cc/.h./-inl.h)."
135 " A pattern without slashes matches just the file name portion, otherwise"
136 " the whole file path below the workspace root"
137 " (still without .cc/.h./-inl.h) is matched."
138 " ? and * in the glob pattern match any single or sequence of characters"
139 " respectively including slashes."
140 " <log level> overrides any value given by --v.")
__anon2617cab90702null141 .OnUpdate([] {
142 absl::log_internal::UpdateVModule(absl::GetFlag(FLAGS_vmodule));
143 });
144