1// Copyright 2013 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 "chrome/browser/extensions/api/log_private/syslog_parser.h"
6
7#include <string>
8#include <vector>
9
10#include "base/logging.h"
11#include "base/memory/linked_ptr.h"
12#include "base/memory/singleton.h"
13#include "base/strings/string_number_conversions.h"
14#include "base/strings/string_split.h"
15#include "base/strings/string_tokenizer.h"
16#include "base/time/time.h"
17#include "chrome/browser/extensions/api/log_private/filter_handler.h"
18#include "chrome/browser/extensions/api/log_private/log_parser.h"
19#include "chrome/browser/extensions/api/log_private/log_private_api.h"
20#include "chrome/common/extensions/api/log_private.h"
21
22namespace extensions {
23
24namespace {
25
26const int kExpectedTimeTokenNum = 7;
27const char kLogEntryDelimiters[] = "-:T";
28const char kProcessInfoDelimiters[] = "[]";
29
30}  // namespace
31
32SyslogParser::SyslogParser() {}
33
34SyslogParser::~SyslogParser() {}
35
36SyslogParser::Error SyslogParser::ParseEntry(
37    const std::string& input,
38    std::vector<linked_ptr<api::log_private::LogEntry> >* output,
39    FilterHandler* filter_handler) const {
40  linked_ptr<api::log_private::LogEntry> entry(new api::log_private::LogEntry);
41
42  base::StringTokenizer tokenizer(input, " ");
43  if (!tokenizer.GetNext()) {
44    LOG(ERROR)
45        << "Error when parsing data. Expect: At least 3 tokens. Actual: 0";
46    return TOKENIZE_ERROR;
47  }
48  std::string time = tokenizer.token();
49  if (ParseTime(time, &(entry->timestamp)) != SyslogParser::SUCCESS) {
50    return SyslogParser::PARSE_ERROR;
51  }
52  // Skips "localhost" field.
53  if (!tokenizer.GetNext()) {
54    LOG(ERROR)
55        << "Error when parsing data. Expect: At least 3 tokens. Actual: 1";
56    return TOKENIZE_ERROR;
57  }
58  if (!tokenizer.GetNext()) {
59    LOG(ERROR)
60        << "Error when parsing data. Expect: At least 3 tokens. Actual: 2";
61    return TOKENIZE_ERROR;
62  }
63  ParseProcess(tokenizer.token(), entry.get());
64  ParseLevel(input, entry.get());
65  entry->full_entry = input;
66
67  if (filter_handler->IsValidLogEntry(*(entry.get()))) {
68    output->push_back(entry);
69  }
70
71  return SyslogParser::SUCCESS;
72}
73
74SyslogParser::Error ParseTimeHelper(base::StringTokenizer* tokenizer,
75                                    std::string* output) {
76  if (!tokenizer->GetNext()) {
77    LOG(ERROR) << "Error when parsing time";
78    return SyslogParser::PARSE_ERROR;
79  }
80  *output = tokenizer->token();
81  return SyslogParser::SUCCESS;
82}
83
84SyslogParser::Error SyslogParser::ParseTime(const std::string& input,
85                                            double* output) const {
86  base::StringTokenizer tokenizer(input, kLogEntryDelimiters);
87  std::string tokens[kExpectedTimeTokenNum];
88  for (int i = 0; i < kExpectedTimeTokenNum; i++) {
89    if (ParseTimeHelper(&tokenizer, &(tokens[i])) != SyslogParser::SUCCESS)
90      return SyslogParser::PARSE_ERROR;
91  }
92
93  std::string buffer = tokens[1] + '-' + tokens[2] + '-' + tokens[0] + ' ' +
94                       tokens[3] + ':' + tokens[4] + ":00";
95
96  base::Time parsed_time;
97  if (!base::Time::FromString(buffer.c_str(), &parsed_time)) {
98    LOG(ERROR) << "Error when parsing time";
99    return SyslogParser::PARSE_ERROR;
100  }
101
102  double seconds;
103  base::StringToDouble(tokens[5], &seconds);
104  *output = parsed_time.ToJsTime() +
105            (seconds * base::Time::kMillisecondsPerSecond);
106
107  return SyslogParser::SUCCESS;
108}
109
110SyslogParser::Error SyslogParser::ParseProcess(
111    const std::string& input,
112    api::log_private::LogEntry* entry) const {
113  base::StringTokenizer tokenizer(input, kProcessInfoDelimiters);
114  if (!tokenizer.GetNext()) {
115    LOG(ERROR)
116        << "Error when parsing data. Expect: At least 1 token. Actual: 0";
117    return SyslogParser::PARSE_ERROR;
118  }
119  entry->process = tokenizer.token();
120  entry->process_id = "unknown";
121  if (tokenizer.GetNext()) {
122    std::string token = tokenizer.token();
123    int tmp;
124    if (base::StringToInt(token, &tmp)) {
125      entry->process_id = token;
126    }
127  }
128  return SyslogParser::SUCCESS;
129}
130
131void SyslogParser::ParseLevel(const std::string& input,
132                              api::log_private::LogEntry* entry) const {
133  if (input.find("ERROR") != std::string::npos) {
134    entry->level = "error";
135  } else if (input.find("WARN") != std::string::npos) {
136    entry->level = "warning";
137  } else if (input.find("INFO") != std::string::npos) {
138    entry->level = "info";
139  } else {
140    entry->level = "unknown";
141  }
142}
143
144}  // namespace extensions
145