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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Protocol\File;
use Countable;
use ArrayIterator;
use Icinga\Data\Selectable;
use Icinga\Data\ConfigObject;
/**
* Read file line by line
*/
class FileReader implements Selectable, Countable
{
/**
* A PCRE string with the fields to extract from the file's lines as named subpatterns
*
* @var string
*/
protected $fields;
/**
* Name of the target file
*
* @var string
*/
protected $filename;
/**
* Cache for static::count()
*
* @var int
*/
protected $count = null;
/**
* Create a new reader
*
* @param ConfigObject $config
*
* @throws FileReaderException If a required $config directive (filename or fields) is missing
*/
public function __construct(ConfigObject $config)
{
foreach (array('filename', 'fields') as $key) {
if (isset($config->{$key})) {
$this->{$key} = $config->{$key};
} else {
throw new FileReaderException('The directive `%s\' is required', $key);
}
}
}
/**
* Instantiate a FileIterator object with the target file
*
* @return FileIterator
*/
public function iterate()
{
return new LogFileIterator($this->filename, $this->fields);
}
/**
* Instantiate a FileQuery object
*
* @return FileQuery
*/
public function select()
{
return new FileQuery($this);
}
/**
* Fetch and return all rows of the given query's result set using an iterator
*
* @param FileQuery $query
*
* @return ArrayIterator
*/
public function query(FileQuery $query)
{
return new ArrayIterator($this->fetchAll($query));
}
/**
* Return the number of available valid lines.
*
* @return int
*/
public function count(): int
{
if ($this->count === null) {
$this->count = iterator_count($this->iterate());
}
return $this->count;
}
/**
* Fetch result as an array of objects
*
* @param FileQuery $query
*
* @return array
*/
public function fetchAll(FileQuery $query)
{
$all = array();
foreach ($this->fetchPairs($query) as $index => $value) {
$all[$index] = (object) $value;
}
return $all;
}
/**
* Fetch result as a key/value pair array
*
* @param FileQuery $query
*
* @return array
*/
public function fetchPairs(FileQuery $query)
{
$skip = $query->getOffset();
$read = $query->getLimit();
if ($skip === null) {
$skip = 0;
}
$lines = array();
if ($query->sortDesc()) {
$count = $this->count();
if ($count <= $skip) {
return $lines;
} elseif ($count < ($skip + $read)) {
$read = $count - $skip;
$skip = 0;
} else {
$skip = $count - ($skip + $read);
}
}
foreach ($this->iterate() as $index => $line) {
if ($index >= $skip) {
if ($index >= $skip + $read) {
break;
}
$lines[] = $line;
}
}
if ($query->sortDesc()) {
$lines = array_reverse($lines);
}
return $lines;
}
/**
* Fetch first result row
*
* @param FileQuery $query
*
* @return object
*/
public function fetchRow(FileQuery $query)
{
$all = $this->fetchAll($query);
if (isset($all[0])) {
return $all[0];
}
return null;
}
/**
* Fetch first result column
*
* @param FileQuery $query
*
* @return array
*/
public function fetchColumn(FileQuery $query)
{
$column = array();
foreach ($this->fetchPairs($query) as $pair) {
foreach ($pair as $value) {
$column[] = $value;
break;
}
}
return $column;
}
/**
* Fetch first column value from first result row
*
* @param FileQuery $query
*
* @return mixed
*/
public function fetchOne(FileQuery $query)
{
$pairs = $this->fetchPairs($query);
if (isset($pairs[0])) {
foreach ($pairs[0] as $value) {
return $value;
}
}
return null;
}
}
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