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/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file logfile.cc
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/resource.h>
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#include <time.h>
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#include "logfile.hh"
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#include "lnav_util.hh"
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using namespace std;
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static const size_t MAX_UNRECOGNIZED_LINES = 1000;
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static const size_t INDEX_RESERVE_INCREMENT = 1024;
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logfile::logfile(const string &filename, logfile_open_options &loo)
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: lf_filename(filename)
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{
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require(!filename.empty());
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memset(&this->lf_stat, 0, sizeof(this->lf_stat));
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if (loo.loo_fd == -1) {
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char resolved_path[PATH_MAX];
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errno = 0;
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if (realpath(filename.c_str(), resolved_path) == NULL) {
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throw error(resolved_path, errno);
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}
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if (stat(resolved_path, &this->lf_stat) == -1) {
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throw error(filename, errno);
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}
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if (!S_ISREG(this->lf_stat.st_mode)) {
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throw error(filename, EINVAL);
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}
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if ((loo.loo_fd = open(resolved_path, O_RDONLY)) == -1) {
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throw error(filename, errno);
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}
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loo.loo_fd.close_on_exec();
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log_info("Creating logfile: fd=%d; size=%" PRId64 "; mtime=%" PRId64 "; filename=%s",
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(int) loo.loo_fd,
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(long long) this->lf_stat.st_size,
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(long long) this->lf_stat.st_mtime,
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filename.c_str());
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this->lf_valid_filename = true;
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}
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else {
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log_perror(fstat(loo.loo_fd, &this->lf_stat));
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this->lf_valid_filename = false;
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}
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this->lf_content_id = hash_string(this->lf_filename);
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this->lf_line_buffer.set_fd(loo.loo_fd);
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this->lf_index.reserve(INDEX_RESERVE_INCREMENT);
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this->lf_options = loo;
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ensure(this->invariant());
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}
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logfile::~logfile()
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{
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}
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bool logfile::exists() const
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{
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struct stat st;
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if (!this->lf_valid_filename) {
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return true;
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}
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if (::stat(this->lf_filename.c_str(), &st) == -1) {
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return false;
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}
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return this->lf_stat.st_dev == st.st_dev &&
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this->lf_stat.st_ino == st.st_ino &&
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this->lf_stat.st_size <= st.st_size;
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}
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void logfile::set_format_base_time(log_format *lf)
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{
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time_t file_time = this->lf_line_buffer.get_file_time();
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if (file_time == 0) {
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file_time = this->lf_stat.st_mtime;
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}
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lf->lf_date_time.set_base_time(file_time);
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}
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bool logfile::process_prefix(off_t offset,
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shared_buffer_ref &sbr,
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const line_value &lv)
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{
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log_format::scan_result_t found = log_format::SCAN_NO_MATCH;
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size_t prescan_size = this->lf_index.size();
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time_t prescan_time = 0;
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bool retval = false;
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if (this->lf_format.get() != nullptr) {
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if (!this->lf_index.empty()) {
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prescan_time = this->lf_index[0].get_time();
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}
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/* We've locked onto a format, just use that scanner. */
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found = this->lf_format->scan(this, this->lf_index, offset, sbr);
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}
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else if (this->lf_options.loo_detect_format &&
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this->lf_index.size() < MAX_UNRECOGNIZED_LINES) {
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vector<log_format *> &root_formats =
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log_format::get_root_formats();
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vector<log_format *>::iterator iter;
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/*
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* Try each scanner until we get a match. Fortunately, all the formats
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* are sufficiently different that there are no ambiguities...
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*/
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for (iter = root_formats.begin();
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iter != root_formats.end() && (found != log_format::SCAN_MATCH);
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++iter) {
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if (!(*iter)->match_name(this->lf_filename)) {
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continue;
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}
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(*iter)->clear();
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this->set_format_base_time(*iter);
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found = (*iter)->scan(this, this->lf_index, offset, sbr);
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if (found == log_format::SCAN_MATCH) {
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#if 0
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require(this->lf_index.size() == 1 ||
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(this->lf_index[this->lf_index.size() - 2] <
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this->lf_index[this->lf_index.size() - 1]));
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#endif
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log_info("%s:%d:log format found -- %s",
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this->lf_filename.c_str(),
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this->lf_index.size(),
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(*iter)->get_name().get());
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this->lf_format = (*iter)->specialized();
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this->set_format_base_time(this->lf_format.get());
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this->lf_content_id = hash_string(string(sbr.get_data(), sbr.length()));
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/*
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* We'll go ahead and assume that any previous lines were
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* written out at the same time as the last one, so we need to
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* go back and update everything.
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*/
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logline &last_line = this->lf_index[this->lf_index.size() - 1];
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for (size_t lpc = 0; lpc < this->lf_index.size() - 1; lpc++) {
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this->lf_index[lpc].set_time(last_line.get_time());
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this->lf_index[lpc].set_millis(last_line.get_millis());
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}
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break;
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}
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}
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}
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switch (found) {
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case log_format::SCAN_MATCH:
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if (!this->lf_index.empty()) {
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this->lf_index.back().set_valid_utf(lv.lv_valid_utf);
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}
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if (!this->lf_index.empty() && prescan_time != this->lf_index[0].get_time()) {
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retval = true;
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}
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if (prescan_size > 0 && prescan_size < this->lf_index.size()) {
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logline &second_to_last = this->lf_index[prescan_size - 1];
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logline &latest = this->lf_index[prescan_size];
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if (latest < second_to_last) {
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if (this->lf_format->lf_time_ordered) {
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this->lf_out_of_time_order_count += 1;
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for (size_t lpc = prescan_size;
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lpc < this->lf_index.size(); lpc++) {
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logline &line_to_update = this->lf_index[lpc];
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line_to_update.set_time_skew(true);
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line_to_update.set_time(second_to_last.get_time());
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line_to_update.set_millis(
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second_to_last.get_millis());
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}
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} else {
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retval = true;
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}
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}
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}
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break;
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case log_format::SCAN_NO_MATCH: {
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log_level_t last_level = LEVEL_UNKNOWN;
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time_t last_time = this->lf_index_time;
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short last_millis = 0;
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uint8_t last_mod = 0, last_opid = 0;
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if (!this->lf_index.empty()) {
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logline &ll = this->lf_index.back();
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/*
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* Assume this line is part of the previous one(s) and copy the
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* metadata over.
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*/
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last_time = ll.get_time();
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last_millis = ll.get_millis();
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if (this->lf_format.get() != NULL) {
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last_level = (log_level_t)(ll.get_level_and_flags() |
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LEVEL_CONTINUED);
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}
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last_mod = ll.get_module_id();
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last_opid = ll.get_opid();
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}
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this->lf_index.emplace_back(offset,
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last_time,
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last_millis,
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last_level,
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last_mod,
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last_opid);
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this->lf_index.back().set_valid_utf(lv.lv_valid_utf);
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break;
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}
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case log_format::SCAN_INCOMPLETE:
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break;
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}
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return retval;
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}
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logfile::rebuild_result_t logfile::rebuild_index()
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{
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rebuild_result_t retval = RR_NO_NEW_LINES;
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struct stat st;
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this->lf_activity.la_polls += 1;
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if (fstat(this->lf_line_buffer.get_fd(), &st) == -1) {
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throw error(this->lf_filename, errno);
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}
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// Check the previous stat against the last to see if things are wonky.
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if (this->lf_stat.st_size > st.st_size) {
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log_info("truncated file detected, closing -- %s",
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this->lf_filename.c_str());
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this->close();
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return RR_NO_NEW_LINES;
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}
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else if (this->lf_line_buffer.is_data_available(this->lf_index_size, st.st_size)) {
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this->lf_activity.la_reads += 1;
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// We haven't reached the end of the file. Note that we use the
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// line buffer's notion of the file size since it may be compressed.
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bool has_format = this->lf_format.get() != nullptr;
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struct rusage begin_rusage;
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shared_buffer_ref sbr;
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off_t last_off, off;
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line_value lv;
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size_t begin_size = this->lf_index.size();
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bool record_rusage = this->lf_index.size() == 1;
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off_t begin_index_size = this->lf_index_size;
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size_t rollback_size = 0;
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if (record_rusage) {
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getrusage(RUSAGE_SELF, &begin_rusage);
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}
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if (!this->lf_index.empty()) {
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off = this->lf_index.back().get_offset();
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/*
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* Drop the last line we read since it might have been a partial
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* read.
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*/
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while (this->lf_index.back().get_sub_offset() != 0) {
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this->lf_index.pop_back();
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rollback_size += 1;
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}
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this->lf_index.pop_back();
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rollback_size += 1;
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this->lf_line_buffer.clear();
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if (!this->lf_index.empty()) {
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off_t check_line_off = this->lf_index.back().get_offset();
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if (!this->lf_line_buffer.read_line(check_line_off, sbr, &lv) ||
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off != check_line_off) {
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log_info("overwritten file detected, closing -- %s",
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this->lf_filename.c_str());
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this->close();
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return RR_NO_NEW_LINES;
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}
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}
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}
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else {
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off = 0;
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}
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last_off = off;
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if (this->lf_logline_observer != NULL) {
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this->lf_logline_observer->logline_restart(*this, rollback_size);
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}
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bool sort_needed = this->lf_sort_needed;
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this->lf_sort_needed = false;
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while (this->lf_line_buffer.read_line(off, sbr, &lv)) {
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size_t old_size = this->lf_index.size();
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// Update this early so that line_length() works
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this->lf_index_size = off;
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if (old_size == 0) {
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shared_buffer_ref avail_sbr;
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this->lf_line_buffer.read_available(avail_sbr);
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this->lf_text_format = detect_text_format(
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avail_sbr.get_data(), avail_sbr.length());
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}
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this->lf_longest_line = std::max(this->lf_longest_line, sbr.length());
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this->lf_partial_line = lv.lv_partial;
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sort_needed = this->process_prefix(last_off, sbr, lv) || sort_needed;
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last_off = off;
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|
|
if (old_size > this->lf_index.size()) {
|
|
|
|
old_size = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (auto iter = this->begin() + old_size;
|
|
|
|
iter != this->end(); ++iter) {
|
|
|
|
if (this->lf_logline_observer != nullptr) {
|
|
|
|
this->lf_logline_observer->logline_new_line(*this, iter, sbr);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this->lf_logfile_observer != nullptr) {
|
|
|
|
this->lf_logfile_observer->logfile_indexing(
|
|
|
|
*this,
|
|
|
|
this->lf_line_buffer.get_read_offset(off),
|
|
|
|
st.st_size);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!has_format && this->lf_format != nullptr) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this->lf_logline_observer != nullptr) {
|
|
|
|
this->lf_logline_observer->logline_eof(*this);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (record_rusage && (off - begin_index_size) > (500 * 1024)) {
|
|
|
|
struct rusage end_rusage;
|
|
|
|
|
|
|
|
getrusage(RUSAGE_SELF, &end_rusage);
|
|
|
|
rusagesub(end_rusage, begin_rusage, this->lf_activity.la_initial_index_rusage);
|
|
|
|
log_info("Resource usage for initial indexing of file: %s:%d-%d",
|
|
|
|
this->lf_filename.c_str(),
|
|
|
|
begin_size,
|
|
|
|
this->lf_index.size());
|
|
|
|
log_rusage(LOG_LEVEL_INFO, this->lf_activity.la_initial_index_rusage);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The file can still grow between the above fstat and when we're
|
|
|
|
* doing the scanning, so use the line buffer's notion of the file
|
|
|
|
* size.
|
|
|
|
*/
|
|
|
|
this->lf_index_size = off;
|
|
|
|
this->lf_stat = st;
|
|
|
|
|
|
|
|
if (sort_needed) {
|
|
|
|
retval = RR_NEW_ORDER;
|
|
|
|
} else {
|
|
|
|
retval = RR_NEW_LINES;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
this->lf_index_time = this->lf_line_buffer.get_file_time();
|
|
|
|
if (!this->lf_index_time) {
|
|
|
|
this->lf_index_time = st.st_mtime;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this->lf_out_of_time_order_count) {
|
|
|
|
log_info("Detected %d out-of-time-order lines in file: %s",
|
|
|
|
this->lf_out_of_time_order_count,
|
|
|
|
this->lf_filename.c_str());
|
|
|
|
this->lf_out_of_time_order_count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
void logfile::read_line(logfile::iterator ll, string &line_out)
|
|
|
|
{
|
|
|
|
try {
|
|
|
|
off_t off = ll->get_offset();
|
|
|
|
shared_buffer_ref sbr;
|
|
|
|
|
|
|
|
line_out.clear();
|
|
|
|
|
|
|
|
size_t line_len = this->line_length(ll, false);
|
|
|
|
|
|
|
|
if (ll->is_valid_utf()) {
|
|
|
|
if (!this->lf_line_buffer.read_range(off, line_len, sbr)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else if (!this->lf_line_buffer.read_line(off, sbr)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this->lf_format != nullptr) {
|
|
|
|
this->lf_format->get_subline(*ll, sbr);
|
|
|
|
}
|
|
|
|
line_out.append(sbr.get_data(), sbr.length());
|
|
|
|
}
|
|
|
|
catch (line_buffer::error & e) {
|
|
|
|
/* ... */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
bool logfile::read_line(logfile::iterator ll, shared_buffer_ref &sbr)
|
|
|
|
{
|
|
|
|
try {
|
|
|
|
off_t off = ll->get_offset();
|
|
|
|
size_t line_len = this->line_length(ll, false);
|
|
|
|
|
|
|
|
if (ll->is_valid_utf()) {
|
|
|
|
if (!this->lf_line_buffer.read_range(off, line_len, sbr)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
} else if (!this->lf_line_buffer.read_line(off, sbr)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (this->lf_format != nullptr) {
|
|
|
|
this->lf_format->get_subline(*ll, sbr);
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
catch (line_buffer::error & e) {
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
void logfile::read_full_message(logfile::iterator ll,
|
|
|
|
string &msg_out,
|
|
|
|
int max_lines)
|
|
|
|
{
|
|
|
|
ostringstream stream;
|
|
|
|
|
|
|
|
do {
|
|
|
|
try {
|
|
|
|
off_t off = ll->get_offset();
|
|
|
|
shared_buffer_ref sbr;
|
|
|
|
|
|
|
|
if (stream.tellp() > 0) {
|
|
|
|
stream.write("\n", 1);
|
|
|
|
}
|
|
|
|
if (this->lf_line_buffer.read_line(off, sbr)) {
|
|
|
|
this->lf_format->get_subline(*ll, sbr, true);
|
|
|
|
stream.write(sbr.get_data(), sbr.length());
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* XXX */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
catch (line_buffer::error & e) {
|
|
|
|
/* ... */
|
|
|
|
}
|
|
|
|
++ll;
|
|
|
|
if (max_lines != -1) {
|
|
|
|
max_lines -= 1;
|
|
|
|
}
|
|
|
|
} while (ll != this->end() && ll->is_continued() && ll->get_sub_offset() == 0 &&
|
|
|
|
(max_lines == -1 || max_lines > 0));
|
|
|
|
|
|
|
|
msg_out = stream.str();
|
|
|
|
}
|
|
|
|
|
|
|
|
void logfile::read_full_message(logfile::iterator ll,
|
|
|
|
shared_buffer_ref &msg_out,
|
|
|
|
int max_lines)
|
|
|
|
{
|
|
|
|
require(ll->get_sub_offset() == 0);
|
|
|
|
|
|
|
|
size_t line_len = this->line_length(ll);
|
|
|
|
|
|
|
|
try {
|
|
|
|
off_t off = ll->get_offset();
|
|
|
|
|
|
|
|
if (this->lf_line_buffer.read_range(off, line_len, msg_out)) {
|
|
|
|
if (this->lf_format.get() != nullptr) {
|
|
|
|
this->lf_format->get_subline(*ll, msg_out, true);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* XXX */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
catch (line_buffer::error & e) {
|
|
|
|
/* ... */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void logfile::set_logline_observer(logline_observer *llo)
|
|
|
|
{
|
|
|
|
this->lf_logline_observer = llo;
|
|
|
|
if (llo != nullptr) {
|
|
|
|
this->reobserve_from(this->begin());
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void logfile::reobserve_from(iterator iter)
|
|
|
|
{
|
|
|
|
if (this->lf_logline_observer != NULL) {
|
|
|
|
for (; iter != this->end(); ++iter) {
|
|
|
|
off_t offset = std::distance(this->begin(), iter);
|
|
|
|
shared_buffer_ref sbr;
|
|
|
|
|
|
|
|
if (this->lf_logfile_observer != NULL) {
|
|
|
|
this->lf_logfile_observer->logfile_indexing(
|
|
|
|
*this, offset, this->size());
|
|
|
|
}
|
|
|
|
|
|
|
|
this->read_line(iter, sbr);
|
|
|
|
this->lf_logline_observer->logline_new_line(*this, iter, sbr);
|
|
|
|
}
|
|
|
|
if (this->lf_logfile_observer != NULL) {
|
|
|
|
this->lf_logfile_observer->logfile_indexing(
|
|
|
|
*this, this->size(), this->size());
|
|
|
|
}
|
|
|
|
|
|
|
|
this->lf_logline_observer->logline_eof(*this);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
filesystem::path logfile::get_path() const
|
|
|
|
{
|
|
|
|
return this->lf_filename;
|
|
|
|
}
|