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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <vespa/log/log.h>
LOG_SETUP("");
LOG_RCSID("$Id$");
#include "errhandle.h"
#include "service.h"
#include "forward.h"
#include "perform.h"
#include "cmdbuf.h"
namespace logdemon {
CmdBuf::CmdBuf()
: _size(1000),
_buf((char *)malloc(_size)),
_bp(_buf),
_left(_size)
{ }
CmdBuf::~CmdBuf()
{
free(_buf);
}
bool
CmdBuf::hasCmd()
{
char *p = _buf;
while (p < _bp) {
if (*p == '\n') return true;
p++;
}
return false;
}
void
CmdBuf::doCmd(Performer& via)
{
char *p = _buf;
while (p < _bp) {
if (*p == '\n') {
*p = '\0';
LOG(spam, "doing command: '%s'", _buf);
via.doCmd(_buf);
++p;
int len = p - _buf;
int movelen = _bp - p;
memmove(_buf, p, movelen);
_bp -= len;
_left += len;
p = _buf;
continue;
}
p++;
}
}
void
CmdBuf::extend()
{
_size *= 2;
int pos = _bp - _buf;
char *nbuf = (char *)realloc(_buf, _size);
if (nbuf == NULL) {
free(_buf);
LOG(error, "could not allocate %d bytes", _size);
throw SomethingBad("realloc failed");
}
_buf = nbuf;
_bp = _buf + pos;
_left = _size - pos;
}
#ifndef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
void
CmdBuf::maybeRead(int fd)
{
struct timeval notime;
notime.tv_sec = 0;
notime.tv_usec = 0;
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
while (select(fd + 1, &fdset, NULL, NULL, ¬ime) > 0) {
// usually loops just once
int oflags = fcntl(fd, F_GETFL);
int nbflags = oflags | O_NONBLOCK;
if (fcntl(fd, F_SETFL, nbflags) != 0) {
LOG(error, "could not fcntl logserver socket: %s",
strerror(errno));
throw SomethingBad("fcntl failed");
}
ssize_t len = ::read(fd, _bp, _left);
if (len > 0) {
_bp += len;
_left -= len;
if (_left < 80) {
extend();
}
} else if (len < 0) {
LOG(warning, "error reading from logserver socket: %s",
strerror(errno));
throw ConnectionException("error reading");
}
fcntl(fd, F_SETFL, oflags);
if (len == 0) {
LOG(warning, "read 0 bytes from logserver socket");
throw ConnectionException("eof on socket");
break;
}
}
return;
}
bool
CmdBuf::readFile(int fd)
{
ssize_t len = ::read(fd, _bp, _left);
if (len > 0) {
_bp += len;
_left -= len;
if (_left < 80) {
extend();
}
return true;
}
if (len < 0) {
LOG(error, "error reading file: %s",
strerror(errno));
throw SomethingBad("read failed");
}
return false;
}
} // namespace
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