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- // Copyright 2020 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 "base/fuchsia/scoped_fx_logger.h"
- #include <lib/fdio/directory.h>
- #include "base/command_line.h"
- #include "base/files/file_path.h"
- #include "base/fuchsia/fuchsia_logging.h"
- #include "base/process/process.h"
- #include "base/strings/string_piece.h"
- #include "base/threading/platform_thread.h"
- namespace base {
- ScopedFxLogger::ScopedFxLogger() = default;
- ScopedFxLogger::~ScopedFxLogger() = default;
- ScopedFxLogger::ScopedFxLogger(ScopedFxLogger&& other) = default;
- ScopedFxLogger& ScopedFxLogger::operator=(ScopedFxLogger&& other) = default;
- // static
- ScopedFxLogger ScopedFxLogger::CreateForProcess(
- std::vector<base::StringPiece> tags) {
- // CHECK()ing or LOG()ing inside this function is safe, since it is only
- // called to initialize logging, not during individual logging operations.
- fuchsia::logger::LogSinkHandle log_sink;
- zx_status_t status =
- fdio_service_connect("/svc/fuchsia.logger.LogSink",
- log_sink.NewRequest().TakeChannel().release());
- if (status != ZX_OK) {
- ZX_LOG(ERROR, status) << "connect(LogSink) failed";
- 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), std::move(tags));
- }
- // static
- ScopedFxLogger ScopedFxLogger::CreateFromLogSink(
- fuchsia::logger::LogSinkHandle log_sink_handle,
- std::vector<base::StringPiece> 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 status = zx::socket::create(ZX_SOCKET_DATAGRAM, &local, &remote);
- ZX_CHECK(status == ZX_OK, status) << "zx_socket_create() failed";
- // ConnectStructured() may fail if e.g. the LogSink has disconnected already.
- fuchsia::logger::LogSinkSyncPtr log_sink;
- log_sink.Bind(std::move(log_sink_handle));
- status = log_sink->ConnectStructured(std::move(remote));
- if (status != ZX_OK) {
- ZX_LOG(ERROR, status) << "ConnectStructured() failed";
- return {};
- }
- return ScopedFxLogger(std::move(tags), std::move(local));
- }
- void ScopedFxLogger::LogMessage(base::StringPiece file,
- uint32_t line_number,
- base::StringPiece msg,
- FuchsiaLogSeverity severity) {
- if (!socket_.is_valid())
- return;
- // 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(severity, cpp17::string_view(file.data(), file.size()),
- line_number, cpp17::string_view(msg.data(), msg.size()),
- false, socket_.borrow(), 0, base::Process::Current().Pid(),
- base::PlatformThread::CurrentId());
- for (const auto& tag : tags_) {
- buffer.WriteKeyValue("tag", tag);
- }
- buffer.FlushRecord();
- }
- ScopedFxLogger::ScopedFxLogger(std::vector<base::StringPiece> tags,
- zx::socket socket)
- : tags_(tags.begin(), tags.end()), socket_(std::move(socket)) {}
- } // namespace base
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