log.cpp

/*
Copyright 2013 Zynga Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#include <stdarg.h>
#include <iostream>
#include "parser.h"
#include "log.h"

#ifndef O_LARGEFILE
# define O_LARGEFILE 0
#endif

#define MAX_LOGBUF_LEN 4*1024
#include <sys/time.h>

int fileOut::open(const char *logFile) {
    if (logFile && logMode == ERRORLOG_FILE) {
        if (-1 == (logFd = ::open(logFile, O_APPEND | O_WRONLY | O_CREAT | O_LARGEFILE, 0644))) {
            fprintf(stderr, "ERROR: opening errorlog '%s' failed. error: %s, Switching to stderr.\n",
                    logFile, strerror(errno));
            logMode = ERRORLOG_STDERR;
        }
    }

    if (logMode == ERRORLOG_STDERR) {
         logFd = STDERR_FILENO;
    }
    return 0;
}

void fileOut::close() {
    switch(logMode) {
        case ERRORLOG_FILE:
            if (logFd != -1) {
                ::close(logFd);
                logFd = -1;
            }
            break;
        case ERRORLOG_STDERR:
            break;
    }
}

int fileOut::write(const char *fmt, ...) {
    va_list ap;
    LOG("in the write function");
    static char logbuf[MAX_LOGBUF_LEN];            /* scratch buffer */
    int logbuf_used = 0;                    /* length of scratch buffer */
    time_t t;
    int out;

    time(&t);
    logbuf_used += strftime(logbuf+logbuf_used, MAX_LOGBUF_LEN - 2,
            "[%Y-%m-%d %H:%M:%S] ", localtime(&t));
    va_start(ap, fmt);
    if ((out = vsnprintf((logbuf + logbuf_used), (MAX_LOGBUF_LEN - logbuf_used - 2),
         fmt, ap)) < 0) {
        LOG("vsnprintf failed to write in buffer");
        return -1;
    }
    logbuf_used += out;
    va_end(ap);
    logbuf[logbuf_used] = '\n';
    logbuf[logbuf_used+1] = '\0';
    ::write(logFd, logbuf, logbuf_used+1);
    return 0;
}

int syslogOut::open(const char *p) {
    openlog(LOG_IDENT_PECL, LOG_CONS | LOG_PID,  LOG_LOCAL4);
    return 0;
}

void syslogOut::close() {
    closelog();
}

int syslogOut::write(const char *fmt, ...) {
    va_list ap;
    static char logbuf[MAX_LOGBUF_LEN];            /* scratch buffer */
    int logbuf_used = 0, out = 0;                    /* length of scratch buffer */

    va_start(ap, fmt);
    if ((out = vsnprintf((logbuf + logbuf_used), (MAX_LOGBUF_LEN - logbuf_used - 2),
         fmt, ap)) < 0) {
        LOG("vsnprintf failed to write in buffer");
        return -1;
    }
    logbuf_used += std::min(out, MAX_LOGBUF_LEN - logbuf_used - 2);
    va_end(ap);

    logbuf[logbuf_used] = '\n';
    logbuf[logbuf_used+1] = '\0';
    syslog(type, "%s", logbuf);
    return 0;
}