1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/vlog.h"
6
7 #include <stddef.h>
8
9 #include <ostream>
10 #include <utility>
11
12 #include "base/logging.h"
13 #include "base/macros.h"
14 #include "base/strings/string_number_conversions.h"
15 #include "base/strings/string_split.h"
16
17 namespace logging {
18
19 const int VlogInfo::kDefaultVlogLevel = 0;
20
21 struct VlogInfo::VmodulePattern {
22 enum MatchTarget { MATCH_MODULE, MATCH_FILE };
23
24 explicit VmodulePattern(const std::string& pattern);
25
26 VmodulePattern();
27
28 std::string pattern;
29 int vlog_level;
30 MatchTarget match_target;
31 };
32
VmodulePattern(const std::string & pattern)33 VlogInfo::VmodulePattern::VmodulePattern(const std::string& pattern)
34 : pattern(pattern),
35 vlog_level(VlogInfo::kDefaultVlogLevel),
36 match_target(MATCH_MODULE) {
37 // If the pattern contains a {forward,back} slash, we assume that
38 // it's meant to be tested against the entire __FILE__ string.
39 std::string::size_type first_slash = pattern.find_first_of("\\/");
40 if (first_slash != std::string::npos)
41 match_target = MATCH_FILE;
42 }
43
VmodulePattern()44 VlogInfo::VmodulePattern::VmodulePattern()
45 : vlog_level(VlogInfo::kDefaultVlogLevel),
46 match_target(MATCH_MODULE) {}
47
VlogInfo(const std::string & v_switch,const std::string & vmodule_switch,int * min_log_level)48 VlogInfo::VlogInfo(const std::string& v_switch,
49 const std::string& vmodule_switch,
50 int* min_log_level)
51 : min_log_level_(min_log_level) {
52 DCHECK_NE(min_log_level, nullptr);
53
54 int vlog_level = 0;
55 if (!v_switch.empty()) {
56 if (base::StringToInt(v_switch, &vlog_level)) {
57 SetMaxVlogLevel(vlog_level);
58 } else {
59 DLOG(WARNING) << "Could not parse v switch \"" << v_switch << "\"";
60 }
61 }
62
63 base::StringPairs kv_pairs;
64 if (!base::SplitStringIntoKeyValuePairs(
65 vmodule_switch, '=', ',', &kv_pairs)) {
66 DLOG(WARNING) << "Could not fully parse vmodule switch \""
67 << vmodule_switch << "\"";
68 }
69 for (base::StringPairs::const_iterator it = kv_pairs.begin();
70 it != kv_pairs.end(); ++it) {
71 VmodulePattern pattern(it->first);
72 if (!base::StringToInt(it->second, &pattern.vlog_level)) {
73 DLOG(WARNING) << "Parsed vlog level for \""
74 << it->first << "=" << it->second
75 << "\" as " << pattern.vlog_level;
76 }
77 vmodule_levels_.push_back(pattern);
78 }
79 }
80
81 VlogInfo::~VlogInfo() = default;
82
83 namespace {
84
85 // Given a path, returns the basename with the extension chopped off
86 // (and any -inl suffix). We avoid using FilePath to minimize the
87 // number of dependencies the logging system has.
GetModule(const base::StringPiece & file)88 base::StringPiece GetModule(const base::StringPiece& file) {
89 base::StringPiece module(file);
90 base::StringPiece::size_type last_slash_pos =
91 module.find_last_of("\\/");
92 if (last_slash_pos != base::StringPiece::npos)
93 module.remove_prefix(last_slash_pos + 1);
94 base::StringPiece::size_type extension_start = module.rfind('.');
95 module = module.substr(0, extension_start);
96 static const char kInlSuffix[] = "-inl";
97 static const int kInlSuffixLen = arraysize(kInlSuffix) - 1;
98 if (module.ends_with(kInlSuffix))
99 module.remove_suffix(kInlSuffixLen);
100 return module;
101 }
102
103 } // namespace
104
GetVlogLevel(const base::StringPiece & file) const105 int VlogInfo::GetVlogLevel(const base::StringPiece& file) const {
106 if (!vmodule_levels_.empty()) {
107 base::StringPiece module(GetModule(file));
108 for (std::vector<VmodulePattern>::const_iterator it =
109 vmodule_levels_.begin(); it != vmodule_levels_.end(); ++it) {
110 base::StringPiece target(
111 (it->match_target == VmodulePattern::MATCH_FILE) ? file : module);
112 if (MatchVlogPattern(target, it->pattern))
113 return it->vlog_level;
114 }
115 }
116 return GetMaxVlogLevel();
117 }
118
SetMaxVlogLevel(int level)119 void VlogInfo::SetMaxVlogLevel(int level) {
120 // Log severity is the negative verbosity.
121 *min_log_level_ = -level;
122 }
123
GetMaxVlogLevel() const124 int VlogInfo::GetMaxVlogLevel() const {
125 return -*min_log_level_;
126 }
127
MatchVlogPattern(const base::StringPiece & string,const base::StringPiece & vlog_pattern)128 bool MatchVlogPattern(const base::StringPiece& string,
129 const base::StringPiece& vlog_pattern) {
130 base::StringPiece p(vlog_pattern);
131 base::StringPiece s(string);
132 // Consume characters until the next star.
133 while (!p.empty() && !s.empty() && (p[0] != '*')) {
134 switch (p[0]) {
135 // A slash (forward or back) must match a slash (forward or back).
136 case '/':
137 case '\\':
138 if ((s[0] != '/') && (s[0] != '\\'))
139 return false;
140 break;
141
142 // A '?' matches anything.
143 case '?':
144 break;
145
146 // Anything else must match literally.
147 default:
148 if (p[0] != s[0])
149 return false;
150 break;
151 }
152 p.remove_prefix(1), s.remove_prefix(1);
153 }
154
155 // An empty pattern here matches only an empty string.
156 if (p.empty())
157 return s.empty();
158
159 // Coalesce runs of consecutive stars. There should be at least
160 // one.
161 while (!p.empty() && (p[0] == '*'))
162 p.remove_prefix(1);
163
164 // Since we moved past the stars, an empty pattern here matches
165 // anything.
166 if (p.empty())
167 return true;
168
169 // Since we moved past the stars and p is non-empty, if some
170 // non-empty substring of s matches p, then we ourselves match.
171 while (!s.empty()) {
172 if (MatchVlogPattern(s, p))
173 return true;
174 s.remove_prefix(1);
175 }
176
177 // Otherwise, we couldn't find a match.
178 return false;
179 }
180
181 } // namespace logging
182