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<?php |
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namespace Ekho\Logstash\Lumberjack; |
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class Encoder implements EncoderInterface |
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{ |
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/** |
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* @param array $hash |
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* @param int $sequence |
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* @return string |
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*/ |
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public function toCompressedFrame($hash, $sequence) |
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{ |
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$frame = $this->toFrame($hash, $sequence); |
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$compressedFrame = gzcompress($frame); |
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return pack("AANA".strlen($compressedFrame), "1", "C", strlen($compressedFrame), $compressedFrame); |
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} |
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/** |
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* @param array $hash |
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* @param int $sequence |
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* @return string |
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*/ |
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public function toFrame($hash, $sequence) |
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{ |
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$frame = array("1", "D", $sequence); |
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$pack = "AAN"; |
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$keys = $this->deepKeys($hash); |
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array_push($frame, count($keys)); |
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$pack .= "N"; |
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foreach ($keys as $k) { |
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$val = $this->deepGet($hash, $k); |
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$keyLength = strlen($k); |
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$valLength = strlen($val); |
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array_push($frame, $keyLength); |
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$pack .= "N"; |
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array_push($frame, $k); |
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$pack .= "A{$keyLength}"; |
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array_push($frame, $valLength); |
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$pack .= "N"; |
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array_push($frame, $val); |
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$pack .= "A{$valLength}"; |
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} |
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array_unshift($frame, $pack); |
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return call_user_func_array('pack', $frame); |
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} |
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/** |
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* @param array $hash |
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* @param string $key |
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* @return null|string |
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*/ |
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private function deepGet($hash, $key) |
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{ |
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if ($key === null) { |
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return $this->stringifyValue($hash); |
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} |
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if (is_array($hash) && array_key_exists($key, $hash)) { |
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return $this->stringifyValue($hash[$key]); |
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} |
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if (strpos($key, '.') === false) { |
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if (!is_array($hash) || !array_key_exists($key, $hash)) { |
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return null; |
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} |
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return $this->stringifyValue($hash[$key]); |
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} |
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list($key, $subkey) = explode('.', $key, 2); |
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return isset($hash[$key]) ? $this->deepGet($hash[$key], $subkey) : null; |
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} |
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/** |
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* @param mixed $value |
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* @return string |
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*/ |
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private function stringifyValue($value) |
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{ |
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if (is_scalar($value)) { |
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if (is_bool($value)) { |
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$value = (int) $value; |
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} |
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return (string) $value; |
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} |
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return json_encode($value); |
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} |
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/** |
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* @param array $hash |
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* @param string $prefix |
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* @return array |
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*/ |
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private function deepKeys($hash, $prefix = "") |
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{ |
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$keys = array(); |
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foreach ($hash as $k => $v) { |
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if (is_scalar($v)) { |
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array_push($keys, "{$prefix}{$k}"); |
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} |
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if (is_array($v)) { |
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$keys = array_merge($keys, $this->deepKeys($hash[$k], "{$prefix}{$k}.")); |
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} |
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} |
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return $keys; |
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} |
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} |
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ekho /
lumberjack-php
