1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/trace_to_file.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/memory/ref_counted_memory.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "base/trace_event/trace_buffer.h"
#include "base/trace_event/trace_log.h"
namespace base::test {
TraceToFile::TraceToFile() : started_(false) {}
TraceToFile::~TraceToFile() {
EndTracingIfNeeded();
}
void TraceToFile::BeginTracingFromCommandLineOptions() {
DCHECK(CommandLine::InitializedForCurrentProcess());
DCHECK(!started_);
if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceToFile)) {
return;
}
// Empty filter (i.e. just --trace-to-file) turns into default categories in
// TraceEventImpl
std::string filter = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kTraceToFile);
FilePath path;
if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceToFileName)) {
path = FilePath(CommandLine::ForCurrentProcess()->GetSwitchValuePath(
switches::kTraceToFileName));
} else {
path = FilePath(FILE_PATH_LITERAL("trace.json"));
}
BeginTracing(path, filter);
}
void TraceToFile::BeginTracing(const FilePath& path,
const std::string& categories) {
DCHECK(!started_);
started_ = true;
path_ = path;
WriteFileHeader();
trace_event::TraceLog::GetInstance()->SetEnabled(
trace_event::TraceConfig(categories, trace_event::RECORD_UNTIL_FULL));
}
void TraceToFile::WriteFileHeader() {
WriteFile(path_, "{\"traceEvents\": [");
}
void TraceToFile::AppendFileFooter() {
const char str[] = "]}";
AppendToFile(path_, str);
}
void TraceToFile::TraceOutputCallback(const std::string& data) {
bool ret = AppendToFile(path_, data);
DCHECK(ret);
}
static void OnTraceDataCollected(
OnceClosure quit_closure,
trace_event::TraceResultBuffer* buffer,
const scoped_refptr<RefCountedString>& json_events_str,
bool has_more_events) {
buffer->AddFragment(json_events_str->as_string());
if (!has_more_events) {
std::move(quit_closure).Run();
}
}
void TraceToFile::EndTracingIfNeeded() {
if (!started_) {
return;
}
started_ = false;
trace_event::TraceLog::GetInstance()->SetDisabled();
trace_event::TraceResultBuffer buffer;
buffer.SetOutputCallback(
BindRepeating(&TraceToFile::TraceOutputCallback, Unretained(this)));
// In tests we might not have a TaskEnvironment, create one if needed.
std::unique_ptr<SingleThreadTaskEnvironment> task_environment;
if (!SingleThreadTaskRunner::HasCurrentDefault()) {
task_environment = std::make_unique<SingleThreadTaskEnvironment>();
}
RunLoop run_loop;
trace_event::TraceLog::GetInstance()->Flush(BindRepeating(
&OnTraceDataCollected, run_loop.QuitClosure(), Unretained(&buffer)));
run_loop.Run();
AppendFileFooter();
}
} // namespace base::test
|
