108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
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// Copyright 2020 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/fuchsia/scoped_fx_logger.h"
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#include <lib/component/incoming/cpp/protocol.h>
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#include <lib/fdio/directory.h>
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#include <stdio.h>
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#include "base/command_line.h"
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#include "base/files/file_path.h"
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#include "base/fuchsia/fuchsia_component_connect.h"
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#include "base/fuchsia/fuchsia_logging.h"
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#include "base/process/process.h"
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#include "base/strings/string_piece.h"
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#include "base/threading/platform_thread.h"
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namespace base {
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ScopedFxLogger::ScopedFxLogger() = default;
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ScopedFxLogger::~ScopedFxLogger() = default;
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ScopedFxLogger::ScopedFxLogger(ScopedFxLogger&& other) = default;
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ScopedFxLogger& ScopedFxLogger::operator=(ScopedFxLogger&& other) = default;
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// static
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ScopedFxLogger ScopedFxLogger::CreateForProcess(
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std::vector<base::StringPiece> tags) {
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// CHECK()ing or LOG()ing inside this function is safe, since it is only
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// called to initialize logging, not during individual logging operations.
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auto log_sink_client_end = component::Connect<fuchsia_logger::LogSink>();
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if (log_sink_client_end.is_error()) {
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LOG(ERROR) << FidlConnectionErrorMessage(log_sink_client_end);
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return {};
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}
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// Rather than relying on automatic LogSink attribution via COMPONENT_NAME,
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// prepend a tag based on the calling process' name. COMPONENT_NAME may be
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// mis-attributed, in some Component configurations, to a parent or caller
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// component, from which the process' LogSink service is routed.
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std::string program_name = base::CommandLine::ForCurrentProcess()
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->GetProgram()
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.BaseName()
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.AsUTF8Unsafe();
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tags.insert(tags.begin(), program_name);
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return CreateFromLogSink(std::move(log_sink_client_end.value()),
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std::move(tags));
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}
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// static
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ScopedFxLogger ScopedFxLogger::CreateFromLogSink(
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fidl::ClientEnd<fuchsia_logger::LogSink> log_sink_client_end,
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std::vector<base::StringPiece> tags) {
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// CHECK()ing or LOG()ing inside this function is safe, since it is only
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// called to initialize logging, not during individual logging operations.
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// Attempts to create a kernel socket object should never fail.
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zx::socket local, remote;
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zx_status_t socket_status =
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zx::socket::create(ZX_SOCKET_DATAGRAM, &local, &remote);
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ZX_CHECK(socket_status == ZX_OK, socket_status)
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<< "zx_socket_create() failed";
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// ConnectStructured() may fail if e.g. the LogSink has disconnected already.
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fidl::SyncClient log_sink(std::move(log_sink_client_end));
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auto connect_structured_result =
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log_sink->ConnectStructured(std::move(remote));
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if (connect_structured_result.is_error()) {
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ZX_LOG(ERROR, connect_structured_result.error_value().status())
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<< "ConnectStructured() failed";
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return {};
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}
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return ScopedFxLogger(std::move(tags), std::move(local));
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}
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void ScopedFxLogger::LogMessage(base::StringPiece file,
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uint32_t line_number,
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base::StringPiece msg,
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FuchsiaLogSeverity severity) {
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if (!socket_.is_valid())
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return;
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// It is not safe to use e.g. CHECK() or LOG() macros here, since those
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// may result in reentrancy if this instance is used for routing process-
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// global logs to the system logger.
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fuchsia_syslog::LogBuffer buffer;
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buffer.BeginRecord(severity, cpp17::string_view(file.data(), file.size()),
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line_number, cpp17::string_view(msg.data(), msg.size()),
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false, socket_.borrow(), 0, base::Process::Current().Pid(),
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base::PlatformThread::CurrentId());
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for (const auto& tag : tags_) {
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buffer.WriteKeyValue("tag", tag);
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}
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if (!buffer.FlushRecord())
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fprintf(stderr, "fuchsia_syslog.LogBuffer.FlushRecord() failed\n");
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}
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ScopedFxLogger::ScopedFxLogger(std::vector<base::StringPiece> tags,
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zx::socket socket)
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: tags_(tags.begin(), tags.end()), socket_(std::move(socket)) {}
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} // namespace base
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