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// Copyright 2020 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/fuchsia/scoped_fx_logger.h"
#include <lib/component/incoming/cpp/protocol.h>
#include <lib/fdio/directory.h>
#include <stdio.h>
#include <string_view>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/fuchsia/fuchsia_component_connect.h"
#include "base/fuchsia/fuchsia_logging.h"
#include "base/process/process.h"
#include "base/threading/platform_thread.h"
namespace base {
namespace {
inline FuchsiaLogSeverity LogSeverityToFuchsiaLogSeverity(
logging::LogSeverity severity) {
switch (severity) {
case logging::LOGGING_INFO:
return FUCHSIA_LOG_INFO;
case logging::LOGGING_WARNING:
return FUCHSIA_LOG_WARNING;
case logging::LOGGING_ERROR:
return FUCHSIA_LOG_ERROR;
case logging::LOGGING_FATAL:
// Don't use FX_LOG_FATAL, otherwise fx_logger_log() will abort().
return FUCHSIA_LOG_ERROR;
}
if (severity > -3) {
// LOGGING_VERBOSE levels 1 and 2.
return FUCHSIA_LOG_DEBUG;
}
// LOGGING_VERBOSE levels 3 and higher, or incorrect levels.
return FUCHSIA_LOG_TRACE;
}
} // namespace
ScopedFxLogger::ScopedFxLogger() = default;
ScopedFxLogger::~ScopedFxLogger() = default;
ScopedFxLogger::ScopedFxLogger(ScopedFxLogger&& other) = default;
ScopedFxLogger& ScopedFxLogger::operator=(ScopedFxLogger&& other) = default;
// static
ScopedFxLogger ScopedFxLogger::CreateForProcess(
std::vector<std::string_view> tags) {
// CHECK()ing or LOG()ing inside this function is safe, since it is only
// called to initialize logging, not during individual logging operations.
auto log_sink_client_end = component::Connect<fuchsia_logger::LogSink>();
if (log_sink_client_end.is_error()) {
LOG(ERROR) << FidlConnectionErrorMessage(log_sink_client_end);
return {};
}
// Rather than relying on automatic LogSink attribution via COMPONENT_NAME,
// prepend a tag based on the calling process' name. COMPONENT_NAME may be
// mis-attributed, in some Component configurations, to a parent or caller
// component, from which the process' LogSink service is routed.
std::string program_name = base::CommandLine::ForCurrentProcess()
->GetProgram()
.BaseName()
.AsUTF8Unsafe();
tags.insert(tags.begin(), program_name);
return CreateFromLogSink(std::move(log_sink_client_end.value()),
std::move(tags));
}
// static
ScopedFxLogger ScopedFxLogger::CreateFromLogSink(
fidl::ClientEnd<fuchsia_logger::LogSink> log_sink_client_end,
std::vector<std::string_view> tags) {
// CHECK()ing or LOG()ing inside this function is safe, since it is only
// called to initialize logging, not during individual logging operations.
// Attempts to create a kernel socket object should never fail.
zx::socket local, remote;
zx_status_t socket_status =
zx::socket::create(ZX_SOCKET_DATAGRAM, &local, &remote);
ZX_CHECK(socket_status == ZX_OK, socket_status)
<< "zx_socket_create() failed";
// ConnectStructured() may fail if e.g. the LogSink has disconnected already.
fidl::SyncClient log_sink(std::move(log_sink_client_end));
auto connect_structured_result =
log_sink->ConnectStructured(std::move(remote));
if (connect_structured_result.is_error()) {
ZX_LOG(ERROR, connect_structured_result.error_value().status())
<< "ConnectStructured() failed";
return {};
}
return ScopedFxLogger(std::move(tags), std::move(local));
}
void ScopedFxLogger::LogMessage(std::string_view file,
uint32_t line_number,
std::string_view msg,
logging::LogSeverity severity) {
if (!socket_.is_valid()) {
return;
}
auto fuchsia_severity = LogSeverityToFuchsiaLogSeverity(severity);
// It is not safe to use e.g. CHECK() or LOG() macros here, since those
// may result in reentrancy if this instance is used for routing process-
// global logs to the system logger.
fuchsia_syslog::LogBuffer buffer;
buffer.BeginRecord(fuchsia_severity,
std::string_view(file.data(), file.size()), line_number,
std::string_view(msg.data(), msg.size()),
socket_.borrow(), 0, base::Process::Current().Pid(),
base::PlatformThread::CurrentId().raw());
for (const auto& tag : tags_) {
buffer.WriteKeyValue("tag", tag);
}
if (!buffer.FlushRecord()) {
fprintf(stderr, "fuchsia_syslog.LogBuffer.FlushRecord() failed\n");
}
}
ScopedFxLogger::ScopedFxLogger(std::vector<std::string_view> tags,
zx::socket socket)
: tags_(tags.begin(), tags.end()), socket_(std::move(socket)) {}
} // namespace base
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