Improve CPU core count detection: integrate FidryCpuCoreCounter (#1767)

See theofidry/cpu-core-counter#11 for the motivations.

The code should be sensibly the same, the notable differences are:

- fixed the deprecated usage of `hw.ncpu`
- add more ways to detect the CPU core counts
- better handling of failures

composer.json

@@ -50,6 +50,7 @@
         "composer-runtime-api": "^2.0",
         "colinodell/json5": "^2.2",
         "composer/xdebug-handler": "^2.0 || ^3.0",
+        "fidry/cpu-core-counter": "^0.4.0",
         "infection/abstract-testframework-adapter": "^0.5.0",
         "infection/extension-installer": "^0.1.0",
         "infection/include-interceptor": "^0.2.5",

src/Resource/Processor/CpuCoresCountProvider.php

@@ -36,17 +36,8 @@
 namespace Infection\Resource\Processor;
 
 use function defined;
-use function extension_loaded;
-use const FILTER_VALIDATE_INT;
-use function filter_var;
-use function function_exists;
-use function is_int;
-use function is_readable;
-use Safe\Exceptions\ExecException;
-use function Safe\file_get_contents;
-use function Safe\shell_exec;
-use function substr_count;
-use function trim;
+use Fidry\CpuCoreCounter\CpuCoreCounter;
+use Fidry\CpuCoreCounter\NumberOfCpuCoreNotFound;
 
 /**
  * @internal
@@ -62,45 +53,10 @@ public static function provide(): int
             return 1;
         }
 
-        if (!extension_loaded('pcntl') || !function_exists('shell_exec')) {
-            return 1;
-        }
-
-        try {
-            // for Linux
-            $hasNproc = trim(@shell_exec('command -v nproc'));
-
-            if ($hasNproc !== '') {
-                $nproc = trim(shell_exec('nproc'));
-                $cpuCount = filter_var($nproc, FILTER_VALIDATE_INT);
-
-                if (is_int($cpuCount)) {
-                    return $cpuCount;
-                }
-            }
-        } catch (ExecException) {
-        }
-
         try {
-            // for MacOS
-            $ncpu = trim(shell_exec('sysctl -n hw.ncpu'));
-            $cpuCount = filter_var($ncpu, FILTER_VALIDATE_INT);
-
-            if (is_int($cpuCount)) {
-                return $cpuCount;
-            }
-        } catch (ExecException) {
-        }
-
-        if (is_readable('/proc/cpuinfo')) {
-            $cpuInfo = file_get_contents('/proc/cpuinfo');
-            $cpuCount = substr_count($cpuInfo, 'processor');
-
-            if ($cpuCount > 0) {
-                return $cpuCount;
-            }
+            return (new CpuCoreCounter())->getCount();
+        } catch (NumberOfCpuCoreNotFound $exception) {
+            return 1;
         }
-
-        return 1;
     }
 }