Add native types to public API

This changeset adds native types to the public API as discussed in reactphp#219.

Once merged, I'm planning to add PHPStan in a follow-up PR which would take advantage of these types.

Builds on top of reactphp#222, reactphp#223 and reactphp/cache#60

src/Config/Config.php

@@ -26,7 +26,7 @@ final class Config
      * @return self
      * @codeCoverageIgnore
      */
-    public static function loadSystemConfigBlocking()
+    public static function loadSystemConfigBlocking(): self
     {
         // Use WMIC output on Windows
         if (DIRECTORY_SEPARATOR === '\\') {
@@ -71,7 +71,7 @@ public static function loadSystemConfigBlocking()
      * @return self
      * @throws RuntimeException if the path can not be loaded (does not exist)
      */
-    public static function loadResolvConfBlocking($path = null)
+    public static function loadResolvConfBlocking(?string $path = null): self
     {
         if ($path === null) {
             $path = '/etc/resolv.conf';
@@ -122,7 +122,7 @@ public static function loadResolvConfBlocking($path = null)
      * @return self
      * @link https://ss64.com/nt/wmic.html
      */
-    public static function loadWmicBlocking($command = null)
+    public static function loadWmicBlocking(?string $command = null): self
     {
         $contents = shell_exec($command === null ? 'wmic NICCONFIG get "DNSServerSearchOrder" /format:CSV' : $command);
         preg_match_all('/(?<=[{;,"])([\da-f.:]{4,})(?=[};,"])/i', $contents, $matches);
@@ -133,5 +133,8 @@ public static function loadWmicBlocking($command = null)
         return $config;
     }
 
+    /**
+     * @var array<string>
+     */
     public $nameservers = [];
 }

src/Config/HostsFile.php

@@ -24,10 +24,9 @@ class HostsFile
     /**
      * Returns the default path for the hosts file on this system
      *
-     * @return string
      * @codeCoverageIgnore
      */
-    public static function getDefaultPath()
+    public static function getDefaultPath(): string
     {
         // use static path for all Unix-based systems
         if (DIRECTORY_SEPARATOR !== '\\') {
@@ -59,7 +58,7 @@ public static function getDefaultPath()
      * @return self
      * @throws RuntimeException if the path can not be loaded (does not exist)
      */
-    public static function loadFromPathBlocking($path = null)
+    public static function loadFromPathBlocking(?string $path = null): self
     {
         if ($path === null) {
             $path = self::getDefaultPath();
@@ -77,10 +76,8 @@ public static function loadFromPathBlocking($path = null)
 
     /**
      * Instantiate new hosts file with the given hosts file contents
-     *
-     * @param string $contents
      */
-    public function __construct($contents)
+    public function __construct(string $contents)
     {
         // remove all comments from the contents
         $contents = preg_replace('/[ \t]*#.*/', '', strtolower($contents));
@@ -92,9 +89,9 @@ public function __construct($contents)
      * Returns all IPs for the given hostname
      *
      * @param string $name
-     * @return string[]
+     * @return array<string>
      */
-    public function getIpsForHost($name)
+    public function getIpsForHost(string $name): array
     {
         $name = strtolower($name);
 
@@ -121,9 +118,9 @@ public function getIpsForHost($name)
      * Returns all hostnames for the given IPv4 or IPv6 address
      *
      * @param string $ip
-     * @return string[]
+     * @return array<string>
      */
-    public function getHostsForIp($ip)
+    public function getHostsForIp(string $ip): array
     {
         // check binary representation of IP to avoid string case and short notation
         $ip = @inet_pton($ip);

src/Model/Message.php

@@ -82,11 +82,8 @@ final class Message
 
     /**
      * Creates a new request message for the given query
-     *
-     * @param Query $query
-     * @return self
      */
-    public static function createRequestForQuery(Query $query)
+    public static function createRequestForQuery(Query $query): self
     {
         $request = new Message();
         $request->id = self::generateId();
@@ -99,11 +96,9 @@ public static function createRequestForQuery(Query $query)
     /**
      * Creates a new response message for the given query with the given answer records
      *
-     * @param Query    $query
-     * @param Record[] $answers
-     * @return self
+     * @param array<Record> $answers
      */
-    public static function createResponseWithAnswersForQuery(Query $query, array $answers)
+    public static function createResponseWithAnswersForQuery(Query $query, array $answers): self
     {
         $response = new Message();
         $response->id = self::generateId();
@@ -126,11 +121,10 @@ public static function createResponseWithAnswersForQuery(Query $query, array $an
      * DNS response messages can not guess the message ID to avoid possible
      * cache poisoning attacks.
      *
-     * @return int
      * @see self::getId()
      * @codeCoverageIgnore
      */
-    private static function generateId()
+    private static function generateId(): int
     {
         return random_int(0, 0xffff);
     }
@@ -199,22 +193,22 @@ private static function generateId()
      * ];
      * ```
      *
-     * @var Query[]
+     * @var array<Query>
      */
     public $questions = [];
 
     /**
-     * @var Record[]
+     * @var array<Record>
      */
     public $answers = [];
 
     /**
-     * @var Record[]
+     * @var array<Record>
      */
     public $authority = [];
 
     /**
-     * @var Record[]
+     * @var array<Record>
      */
     public $additional = [];
 }

src/Model/Record.php

@@ -131,18 +131,14 @@ final class Record
      *   considered a BC break. See the format definition of known types above
      *   for more details.
      *
-     * @var string|string[]|array
+     * @var string|array<string>
      */
     public $data;
 
     /**
-     * @param string                $name
-     * @param int                   $type
-     * @param int                   $class
-     * @param int                   $ttl
-     * @param string|string[]|array $data
+     * @param string|array<string> $data
      */
-    public function __construct($name, $type, $class, $ttl, $data)
+    public function __construct(string $name, int $type, int $class, int $ttl, $data)
     {
         $this->name     = $name;
         $this->type     = $type;

src/Protocol/BinaryDumper.php

@@ -8,11 +8,7 @@
 
 final class BinaryDumper
 {
-    /**
-     * @param Message $message
-     * @return string
-     */
-    public function toBinary(Message $message)
+    public function toBinary(Message $message): string
     {
         $data = '';
 
@@ -25,11 +21,7 @@ public function toBinary(Message $message)
         return $data;
     }
 
-    /**
-     * @param Message $message
-     * @return string
-     */
-    private function headerToBinary(Message $message)
+    private function headerToBinary(Message $message): string
     {
         $data = '';
 
@@ -56,10 +48,9 @@ private function headerToBinary(Message $message)
     }
 
     /**
-     * @param Query[] $questions
-     * @return string
+     * @param array<Query> $questions
      */
-    private function questionToBinary(array $questions)
+    private function questionToBinary(array $questions): string
     {
         $data = '';
 
@@ -72,10 +63,10 @@ private function questionToBinary(array $questions)
     }
 
     /**
-     * @param Record[] $records
+     * @param array<Record> $records
      * @return string
      */
-    private function recordsToBinary(array $records)
+    private function recordsToBinary(array $records): string
     {
         $data = '';
 
@@ -163,10 +154,9 @@ private function recordsToBinary(array $records)
     }
 
     /**
-     * @param string[] $texts
-     * @return string
+     * @param array<string> $texts
      */
-    private function textsToBinary(array $texts)
+    private function textsToBinary(array $texts): string
     {
         $data = '';
         foreach ($texts as $text) {
@@ -175,11 +165,7 @@ private function textsToBinary(array $texts)
         return $data;
     }
 
-    /**
-     * @param string $host
-     * @return string
-     */
-    private function domainNameToBinary($host)
+    private function domainNameToBinary(string $host): string
     {
         if ($host === '') {
             return "\0";

src/Protocol/Parser.php

@@ -17,11 +17,9 @@ final class Parser
     /**
      * Parses the given raw binary message into a Message object
      *
-     * @param string $data
      * @throws InvalidArgumentException
-     * @return Message
      */
-    public function parseMessage($data)
+    public function parseMessage(string $data): Message
     {
         $message = $this->parse($data, 0);
         if ($message === null) {
@@ -32,11 +30,9 @@ public function parseMessage($data)
     }
 
     /**
-     * @param string $data
-     * @param int    $consumed
      * @return ?Message
      */
-    private function parse($data, $consumed)
+    private function parse(string $data, int $consumed)
     {
         if (!isset($data[12 - 1])) {
             return null;
@@ -99,11 +95,9 @@ private function parse($data, $consumed)
     }
 
     /**
-     * @param string $data
-     * @param int $consumed
-     * @return array
+     * @return array{Query, int}|array{null, null}
      */
-    private function parseQuestion($data, $consumed)
+    private function parseQuestion(string $data, int $consumed): array
     {
         list($labels, $consumed) = $this->readLabels($data, $consumed);
 
@@ -125,11 +119,9 @@ private function parseQuestion($data, $consumed)
     }
 
     /**
-     * @param string $data
-     * @param int $consumed
-     * @return array An array with a parsed Record on success or array with null if data is invalid/incomplete
+     * @return array{Record, int}|array{null, null} An array with a parsed Record on success or array with null if data is invalid/incomplete
      */
-    private function parseRecord($data, $consumed)
+    private function parseRecord(string $data, int $consumed): array
     {
         list($name, $consumed) = $this->readDomain($data, $consumed);
 
@@ -278,7 +270,10 @@ private function parseRecord($data, $consumed)
         ];
     }
 
-    private function readDomain($data, $consumed)
+    /**
+     * @return array{string, int}|array{null, null}
+     */
+    private function readDomain(string $data, int $consumed): array
     {
         list ($labels, $consumed) = $this->readLabels($data, $consumed);
 
@@ -302,12 +297,10 @@ function ($label) {
     }
 
     /**
-     * @param string $data
-     * @param int    $consumed
-     * @param int    $compressionDepth maximum depth for compressed labels to avoid unreasonable recursion
-     * @return array
+     * @param int $compressionDepth maximum depth for compressed labels to avoid unreasonable recursion
+     * @return array{array<string>, int}|array{null, null}
      */
-    private function readLabels($data, $consumed, $compressionDepth = 127)
+    private function readLabels(string $data, int $consumed, int $compressionDepth = 127): array
     {
         $labels = [];
 

src/Query/CachingExecutor.php

@@ -5,6 +5,7 @@
 use React\Cache\CacheInterface;
 use React\Dns\Model\Message;
 use React\Promise\Promise;
+use React\Promise\PromiseInterface;
 
 final class CachingExecutor implements ExecutorInterface
 {
@@ -24,7 +25,7 @@ public function __construct(ExecutorInterface $executor, CacheInterface $cache)
         $this->cache = $cache;
     }
 
-    public function query(Query $query)
+    public function query(Query $query): PromiseInterface
     {
         $id = $query->name . ':' . $query->type . ':' . $query->class;
 

src/Query/CoopExecutor.php

@@ -3,6 +3,7 @@
 namespace React\Dns\Query;
 
 use React\Promise\Promise;
+use React\Promise\PromiseInterface;
 
 /**
  * Cooperatively resolves hosts via the given base executor to ensure same query is not run concurrently
@@ -45,7 +46,7 @@ public function __construct(ExecutorInterface $base)
         $this->executor = $base;
     }
 
-    public function query(Query $query)
+    public function query(Query $query): PromiseInterface
     {
         $key = $this->serializeQueryToIdentity($query);
         if (isset($this->pending[$key])) {

src/Query/ExecutorInterface.php

@@ -2,6 +2,8 @@
 
 namespace React\Dns\Query;
 
+use React\Promise\PromiseInterface;
+
 interface ExecutorInterface
 {
     /**
@@ -39,5 +41,5 @@ interface ExecutorInterface
      * @return \React\Promise\PromiseInterface<\React\Dns\Model\Message>
      *     resolves with response message on success or rejects with an Exception on error
      */
-    public function query(Query $query);
+    public function query(Query $query): PromiseInterface;
 }