124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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LogStream::LineBuffer::LineBuffer()
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: _buf(_smallbuf), _cap(sizeof(_smallbuf)), _pos(0)
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{
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_buf[0] = '\0';
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}
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LogStream::LineBuffer::~LineBuffer() {
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assert(_pos == 0, "still outstanding bytes in the line buffer");
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if (_buf != _smallbuf) {
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os::free(_buf);
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}
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}
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// try_ensure_cap tries to enlarge the capacity of the internal buffer
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// to the given atleast value. May fail if either OOM happens or atleast
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// is larger than a reasonable max of 1 M. Caller must not assume
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// capacity without checking.
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void LogStream::LineBuffer::try_ensure_cap(size_t atleast) {
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assert(_cap >= sizeof(_smallbuf), "sanity");
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if (_cap < atleast) {
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// Cap out at a reasonable max to prevent runaway leaks.
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const size_t reasonable_max = 1 * M;
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assert(_cap <= reasonable_max, "sanity");
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if (_cap == reasonable_max) {
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return;
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}
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const size_t additional_expansion = 256;
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size_t newcap = align_up(atleast + additional_expansion, additional_expansion);
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if (newcap > reasonable_max) {
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log_info(logging)("Suspiciously long log line: \"%.100s%s",
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_buf, (_pos >= 100 ? "..." : ""));
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newcap = reasonable_max;
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}
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char* const newbuf = (char*) os::malloc(newcap, mtLogging);
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if (newbuf == NULL) { // OOM. Leave object unchanged.
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return;
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}
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if (_pos > 0) { // preserve old content
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memcpy(newbuf, _buf, _pos + 1); // ..including trailing zero
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}
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if (_buf != _smallbuf) {
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os::free(_buf);
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}
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_buf = newbuf;
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_cap = newcap;
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}
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assert(_cap >= atleast, "sanity");
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}
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void LogStream::LineBuffer::append(const char* s, size_t len) {
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assert(_buf[_pos] == '\0', "sanity");
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assert(_pos < _cap, "sanity");
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const size_t minimum_capacity_needed = _pos + len + 1;
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try_ensure_cap(minimum_capacity_needed);
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// try_ensure_cap may not have enlarged the capacity to the full requested
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// extend or may have not worked at all. In that case, just gracefully work
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// with what we have already; just truncate if necessary.
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if (_cap < minimum_capacity_needed) {
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len = _cap - _pos - 1;
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if (len == 0) {
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return;
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}
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}
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memcpy(_buf + _pos, s, len);
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_pos += len;
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_buf[_pos] = '\0';
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}
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void LogStream::LineBuffer::reset() {
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_pos = 0;
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_buf[_pos] = '\0';
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}
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void LogStream::write(const char* s, size_t len) {
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if (len > 0 && s[len - 1] == '\n') {
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_current_line.append(s, len - 1); // omit the newline.
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_log_handle.print("%s", _current_line.buffer());
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_current_line.reset();
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} else {
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_current_line.append(s, len);
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}
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update_position(s, len);
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}
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// Destructor writes any unfinished output left in the line buffer.
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LogStream::~LogStream() {
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if (_current_line.is_empty() == false) {
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_log_handle.print("%s", _current_line.buffer());
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_current_line.reset();
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}
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}
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