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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/message_loop/message_loop.h"
#include "base/synchronization/waitable_event.h"
#include "base/trace_event/trace_event.h"
#include "components/tracing/startup_tracing.h"
#include "components/tracing/tracing_switches.h"
#include "mojo/runner/context.h"
#include "mojo/runner/switches.h"
namespace mojo {
namespace runner {
namespace {
// Whether we're currently tracing.
bool g_tracing = false;
// Number of tracing blocks written.
uint32_t g_blocks = 0;
// Trace file, if open.
FILE* g_trace_file = nullptr;
void WriteTraceDataCollected(
base::WaitableEvent* event,
const scoped_refptr<base::RefCountedString>& events_str,
bool has_more_events) {
if (g_blocks) {
fwrite(",", 1, 1, g_trace_file);
}
++g_blocks;
fwrite(events_str->data().c_str(), 1, events_str->data().length(),
g_trace_file);
if (!has_more_events) {
static const char kEnd[] = "]}";
fwrite(kEnd, 1, strlen(kEnd), g_trace_file);
PCHECK(fclose(g_trace_file) == 0);
g_trace_file = nullptr;
event->Signal();
}
}
void EndTraceAndFlush(base::WaitableEvent* event) {
g_trace_file = fopen("mojo_shell.trace", "w+");
PCHECK(g_trace_file);
static const char kStart[] = "{\"traceEvents\":[";
fwrite(kStart, 1, strlen(kStart), g_trace_file);
base::trace_event::TraceLog::GetInstance()->SetDisabled();
base::trace_event::TraceLog::GetInstance()->Flush(
base::Bind(&WriteTraceDataCollected, base::Unretained(event)));
}
void StopTracingAndFlushToDisk() {
g_tracing = false;
base::trace_event::TraceLog::GetInstance()->SetDisabled();
base::WaitableEvent flush_complete_event(false, false);
// TraceLog::Flush requires a message loop but we've already shut ours down.
// Spin up a new thread to flush things out.
base::Thread flush_thread("mojo_shell_trace_event_flush");
flush_thread.Start();
flush_thread.message_loop()->PostTask(
FROM_HERE,
base::Bind(EndTraceAndFlush, base::Unretained(&flush_complete_event)));
flush_complete_event.Wait();
}
} // namespace
int LauncherProcessMain(int argc, char** argv) {
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
if (command_line.HasSwitch(switches::kTraceStartup)) {
g_tracing = true;
base::trace_event::TraceConfig trace_config(
command_line.GetSwitchValueASCII(switches::kTraceStartup),
base::trace_event::RECORD_UNTIL_FULL);
base::trace_event::TraceLog::GetInstance()->SetEnabled(
trace_config, base::trace_event::TraceLog::RECORDING_MODE);
} else {
// |g_tracing| is not touched in this case and Telemetry will stop tracing
// on demand later.
tracing::EnableStartupTracingIfConfigFileExists();
}
// We want the shell::Context to outlive the MessageLoop so that pipes are
// all gracefully closed / error-out before we try to shut the Context down.
Context shell_context;
{
base::MessageLoop message_loop;
if (!shell_context.Init()) {
return 0;
}
if (g_tracing) {
message_loop.PostDelayedTask(FROM_HERE,
base::Bind(StopTracingAndFlushToDisk),
base::TimeDelta::FromSeconds(5));
}
message_loop.PostTask(
FROM_HERE,
base::Bind(&Context::RunCommandLineApplication,
base::Unretained(&shell_context), base::Closure()));
message_loop.Run();
// Must be called before |message_loop| is destroyed.
shell_context.Shutdown();
}
if (g_tracing)
StopTracingAndFlushToDisk();
return 0;
}
} // namespace runner
} // namespace mojo
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