/**
* Purpose: Replaces host in trigger expression.
* {localhost:agent.ping.nodata(5m)} => {localhost6:agent.ping.nodata(5m)}
*
* @param string $expression full expression with host names and item keys
* @param string $src_host
* @param string $dst_host
*
* @return string
*/
function triggerExpressionReplaceHost($expression, $src_host, $dst_host)
{
$new_expression = '';
$function_macro_parser = new CFunctionMacroParser();
$user_macro_parser = new CUserMacroParser();
$macro_parser = new CMacroParser(['{TRIGGER.VALUE}']);
$lld_macro_parser = new CLLDMacroParser();
for ($pos = 0, $pos_left = 0; isset($expression[$pos]); $pos++) {
if ($function_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$host = $function_macro_parser->getHost();
$item = $function_macro_parser->getItem();
$function = $function_macro_parser->getFunction();
if ($host === $src_host) {
$host = $dst_host;
}
$new_expression .= substr($expression, $pos_left, $pos - $pos_left);
$new_expression .= '{' . $host . ':' . $item . '.' . $function . '}';
$pos_left = $pos + $function_macro_parser->getLength();
$pos += $function_macro_parser->getLength() - 1;
} elseif ($user_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $user_macro_parser->getLength() - 1;
} elseif ($macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $macro_parser->getLength() - 1;
} elseif ($lld_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $lld_macro_parser->getLength() - 1;
}
}
$new_expression .= substr($expression, $pos_left, $pos - $pos_left);
return $new_expression;
}
/**
* Parse key and parameters and put them into $this->parameters array.
*
* @param string $data
* @param int $offset
*/
public function parse($data, $offset = 0)
{
$this->length = 0;
$this->match = '';
$this->key = '';
$this->parameters = [];
for ($p = $offset; isset($data[$p]) && $this->isKeyChar($data[$p]); $p++) {
// Code is not missing here.
}
// is key empty?
if ($p == $offset) {
$this->error = isset($data[$p]) ? $this->errorMessage(substr($data, $offset), 0) : _('key is empty');
return self::PARSE_FAIL;
}
$_18_simple_check = false;
// old-style simple checks
if ($this->options['18_simple_checks'] && isset($data[$p]) && $data[$p] === ',') {
$p++;
$user_macro_parser = new CUserMacroParser();
if ($user_macro_parser->parse($data, $p) != CParser::PARSE_FAIL) {
$p += $user_macro_parser->getLength();
} else {
for (; isset($data[$p]) && $data[$p] > '0' && $data[$p] < '9'; $p++) {
// Code is not missing here.
}
}
$_18_simple_check = true;
}
$this->key = substr($data, $offset, $p - $offset);
$p2 = $p;
if (!$_18_simple_check) {
// Zapcat compatibility.
for (; isset($data[$p2]) && $data[$p2] == '['; $p = $p2) {
$_parameters = ['type' => self::PARAM_ARRAY, 'raw' => '', 'pos' => $p2 - $offset, 'parameters' => []];
if (!$this->parseKeyParameters($data, $p2, $_parameters['parameters'])) {
break;
}
$_parameters['raw'] = substr($data, $p, $p2 - $p);
$this->parameters[] = $_parameters;
}
}
$this->length = $p - $offset;
$this->match = substr($data, $offset, $this->length);
if (!isset($data[$p])) {
$this->error = '';
return self::PARSE_SUCCESS;
}
$this->error = !isset($data[$p2]) ? _('unexpected end of key') : $this->errorMessage(substr($data, $offset), $p2 - $offset);
return self::PARSE_SUCCESS_CONT;
}
/**
* Find function ids in trigger expression.
*
* @param string $expression
*
* @return array where key is function id position in expression and value is function id
*/
protected function findFunctions($expression)
{
$functionids = [];
$functionid_parser = new CFunctionIdParser();
$macro_parser = new CMacroParser(['{TRIGGER.VALUE}']);
$user_macro_parser = new CUserMacroParser();
for ($pos = 0, $i = 1; isset($expression[$pos]); $pos++) {
if ($functionid_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $functionid_parser->getLength() - 1;
$functionids[$i++] = substr($functionid_parser->getMatch(), 1, -1);
} elseif ($user_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $user_macro_parser->getLength() - 1;
} elseif ($macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
$pos += $macro_parser->getLength() - 1;
}
}
if (array_key_exists(1, $functionids)) {
$functionids[0] = $functionids[1];
}
return $functionids;
}
