Removed FFI support (#45)

* Removed FFI support

* run_tests and ci-test.sh should never have differed. Fixing now

* run_tests can now update composer

src/AWS/CRT/CRT.php

@@ -22,30 +22,10 @@ final class CRT {
 
     function __construct() {
         if (is_null(self::$impl)) {
-            // Figure out what backends are/should be available
-            $backends = ['Extension'];
-            if (extension_loaded('ffi')) {
-                $backends = ['Extension', 'FFI'];
-                if (getenv('AWS_CRT_PHP_EXTENSION')) {
-                    $backends = ['Extension'];
-                } else if (getenv('AWS_CRT_PHP_FFI')) {
-                    $backends = ['FFI'];
-                }
-            }
-
-            // Try to load each backend, give up if none succeed
-            $exceptions = [];
-            foreach ($backends as $backend) {
-                try {
-                    $backend = 'AWS\\CRT\\Internal\\' . $backend;
-                    self::$impl = new $backend();
-                    break;
-                } catch (RuntimeException $rex) {
-                    array_push($exceptions, $rex);
-                }
-            }
-            if (is_null(self::$impl)) {
-                throw new RuntimeException('Unable to initialize AWS CRT via ' . join(', ', $backends) . ": \n" . join("\n", $exceptions), -1);
+            try {
+                self::$impl = new Extension();
+            } catch (RuntimeException $rex) {
+                throw new RuntimeException("Unable to initialize AWS CRT via awscrt extension: \n$rex", -1);
             }
         }
         ++self::$refcount;
@@ -58,7 +38,7 @@ final class CRT {
     }
 
     /**
-     * @return bool whether or not the CRT is currently loaded with an active backend
+     * @return bool whether or not the CRT is currently loaded
      */
     public static function isLoaded() {
         return !is_null(self::$impl);
@@ -76,20 +56,6 @@ final class CRT {
         }
     }
 
-    /**
-     * @return bool true if using PHP FFI (PHP 7.4+)
-     */
-    public static function isFFI() {
-        return self::isLoaded() && strstr(get_class(self::$impl), 'FFI');
-    }
-
-    /**
-     * @return bool true if using PHP Extension awscrt
-     */
-    public static function isExtension() {
-        return self::isLoaded() && strstr(get_class(self::$impl), 'Extension');
-    }
-
     /**
      * @return integer last error code reported within the CRT
      */

src/AWS/CRT/Internal/FFI.php

@@ -1,82 +0,0 @@
-<?php
-
-namespace AWS\CRT\Internal;
-
-use Exception;
-use RuntimeException;
-
-/**
- * @internal
- * Forwards calls on to libaws-crt-ffi via FFI
- */
-final class FFI {
-    private static $ffi = null;
-    private static $refcount = 0;
-
-    function __construct() {
-        if (is_null(self::$ffi)) {
-            try {
-                $shlib_ext = 'so';
-                $uname_s = php_uname('s');
-                if ($uname_s == 'Darwin') {
-                    $shlib_ext = 'dylib';
-                } else if ($uname_s == 'WINNT') {
-                    $shlib_ext = 'dll';
-                }
-                self::$ffi = \FFI::cdef(
-                    file_get_contents(__DIR__ . "/../../../api.h"),
-                    __DIR__ . "/../../../libaws-crt-ffi." . $shlib_ext);
-                self::init();
-            } catch (Exception $e) {
-                throw new RuntimeException('Exception while initializing CRT via FFI', 0, $e);
-            }
-        }
-        ++self::$refcount;
-    }
-
-    function __destruct() {
-        if (--self::$refcount == 0) {
-            self::clean_up();
-            self::$ffi = null;
-        }
-    }
-
-    /**
-     * Forwards any call made on this object to the FFI function of the
-     * same name with the supplied arguments. Argument type hinting and checking
-     * occurs at the CRT wrapper.
-     */
-    function __call(string $name, $args) {
-        // Expand strings to (string, length)
-        $ffi_args =[];
-        foreach ($args as $arg) {
-            if (is_string($arg)) {
-                $len = strlen($arg);
-                if ($len > 0) {
-                    $uint8_t = \FFI::type('uint8_t');
-                    $uint8_array = \FFI::arrayType($uint8_t, [$len]);
-                    $buf = \FFI::new($uint8_array);
-                    \FFI::memcpy($buf, $arg, $len);
-                    $ffi_args [] = $buf;
-                    $ffi_args [] = $len;
-                } else {
-                    $ffi_args [] = null;
-                    $ffi_args [] = 0;
-                }
-            } else if (is_resource($arg)) {
-                throw new RuntimeException("Resource types are not supported for FFI");
-            } else {
-                $ffi_args []= $arg;
-            }
-        }
-        return call_user_func_array([self::$ffi, $name], $ffi_args);
-    }
-
-    private static function init() {
-        return self::$ffi->aws_crt_init();
-    }
-
-    private static function clean_up() {
-        return self::$ffi->aws_crt_clean_up();
-    }
-}