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Matt Spinlerd96fa602022-12-15 11:11:26 -06001/**
2 * Copyright © 2023 IBM Corporation
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#include "journal.hpp"
17
Matt Spinler9d921092022-12-15 11:54:49 -060018#include "util.hpp"
Matt Spinlerd96fa602022-12-15 11:11:26 -060019
Matt Spinler9d921092022-12-15 11:54:49 -060020#include <fmt/format.h>
21
22#include <phosphor-logging/log.hpp>
Matt Spinlerd96fa602022-12-15 11:11:26 -060023
24namespace openpower::pels
25{
26
27using namespace phosphor::logging;
28
29/**
30 * @class JournalCloser
31 *
32 * Closes the journal on destruction
33 */
34class JournalCloser
35{
36 public:
37 JournalCloser() = delete;
38 JournalCloser(const JournalCloser&) = delete;
39 JournalCloser(JournalCloser&&) = delete;
40 JournalCloser& operator=(const JournalCloser&) = delete;
41 JournalCloser& operator=(JournalCloser&&) = delete;
42
43 explicit JournalCloser(sd_journal* journal) : journal{journal} {}
44
45 ~JournalCloser()
46 {
47 sd_journal_close(journal);
48 }
49
50 private:
51 sd_journal* journal{nullptr};
52};
53
Matt Spinler9d921092022-12-15 11:54:49 -060054void Journal::sync() const
55{
56 auto start = std::chrono::steady_clock::now();
57
58 util::journalSync();
59
60 auto end = std::chrono::steady_clock::now();
61 auto duration =
62 std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
63
64 if (duration.count() > 100)
65 {
66 log<level::INFO>(
67 fmt::format("Journal sync took {}ms", duration.count()).c_str());
68 }
69}
70
Matt Spinlerd96fa602022-12-15 11:11:26 -060071std::vector<std::string> Journal::getMessages(const std::string& syslogID,
72 size_t maxMessages) const
73{
74 // The message registry JSON schema will also fail if a zero is in the JSON
75 if (0 == maxMessages)
76 {
77 log<level::ERR>(
78 "maxMessages value of zero passed into Journal::getMessages");
79 return std::vector<std::string>{};
80 }
81
82 sd_journal* journal;
83 int rc = sd_journal_open(&journal, SD_JOURNAL_LOCAL_ONLY);
84 if (rc < 0)
85 {
86 throw std::runtime_error{std::string{"Failed to open journal: "} +
87 strerror(-rc)};
88 }
89
90 JournalCloser closer{journal};
91
92 if (!syslogID.empty())
93 {
94 std::string match{"SYSLOG_IDENTIFIER=" + syslogID};
95
96 rc = sd_journal_add_match(journal, match.c_str(), 0);
97 if (rc < 0)
98 {
99 throw std::runtime_error{
100 std::string{"Failed to add journal match: "} + strerror(-rc)};
101 }
102 }
103
104 // Loop through matching entries from newest to oldest
105 std::vector<std::string> messages;
106 messages.reserve(maxMessages);
107 std::string sID, pid, message, timeStamp, line;
108
109 SD_JOURNAL_FOREACH_BACKWARDS(journal)
110 {
111 timeStamp = getTimeStamp(journal);
112 sID = getFieldValue(journal, "SYSLOG_IDENTIFIER");
113 pid = getFieldValue(journal, "_PID");
114 message = getFieldValue(journal, "MESSAGE");
115
116 line = timeStamp + " " + sID + "[" + pid + "]: " + message;
117 messages.emplace(messages.begin(), line);
118
119 if (messages.size() >= maxMessages)
120 {
121 break;
122 }
123 }
124
125 return messages;
126}
127
128std::string Journal::getFieldValue(sd_journal* journal,
129 const std::string& field) const
130{
131 std::string value{};
132
133 const void* data{nullptr};
134 size_t length{0};
135 int rc = sd_journal_get_data(journal, field.c_str(), &data, &length);
136 if (rc < 0)
137 {
138 if (-rc == ENOENT)
139 {
140 // Current entry does not include this field; return empty value
141 return value;
142 }
143 else
144 {
145 throw std::runtime_error{
146 std::string{"Failed to read journal entry field: "} +
147 strerror(-rc)};
148 }
149 }
150
151 // Get value from field data. Field data in format "FIELD=value".
152 std::string dataString{static_cast<const char*>(data), length};
153 std::string::size_type pos = dataString.find('=');
154 if ((pos != std::string::npos) && ((pos + 1) < dataString.size()))
155 {
156 // Value is substring after the '='
157 value = dataString.substr(pos + 1);
158 }
159
160 return value;
161}
162
163std::string Journal::getTimeStamp(sd_journal* journal) const
164{
165 // Get realtime (wallclock) timestamp of current journal entry. The
166 // timestamp is in microseconds since the epoch.
167 uint64_t usec{0};
168 int rc = sd_journal_get_realtime_usec(journal, &usec);
169 if (rc < 0)
170 {
171 throw std::runtime_error{
172 std::string{"Failed to get journal entry timestamp: "} +
173 strerror(-rc)};
174 }
175
176 // Convert to number of seconds since the epoch
177 time_t secs = usec / 1000000;
178
179 // Convert seconds to tm struct required by strftime()
180 struct tm* timeStruct = localtime(&secs);
181 if (timeStruct == nullptr)
182 {
183 throw std::runtime_error{
184 std::string{"Invalid journal entry timestamp: "} + strerror(errno)};
185 }
186
187 // Convert tm struct into a date/time string
188 char timeStamp[80];
189 strftime(timeStamp, sizeof(timeStamp), "%b %d %H:%M:%S", timeStruct);
190
191 return timeStamp;
192}
193
194} // namespace openpower::pels