Laravel源码分析--Laravel生命周期详解

<?php

/**
 * laravel - a php framework for web artisans
 *
 * @package  laravel
 * @author   taylor otwell <taylor@laravel.com>
 */

define('laravel_start', microtime(true));

/*
|--------------------------------------------------------------------------
| register the auto loader
|--------------------------------------------------------------------------
|
| composer provides a convenient, automatically generated class loader for
| our application. we just need to utilize it! we'll simply require it
| into the script here so that we don't have to worry about manual
| loading any of our classes later on. it feels great to relax.
|
*/

require __dir__.'/../vendor/autoload.php';

/*
|--------------------------------------------------------------------------
| turn on the lights
|--------------------------------------------------------------------------
|
| we need to illuminate php development, so let us turn on the lights.
| this bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight our users.
|
*/

$app = require_once __dir__.'/../bootstrap/app.php';

/*
|--------------------------------------------------------------------------
| run the application
|--------------------------------------------------------------------------
|
| once we have the application, we can handle the incoming request
| through the kernel, and send the associated response back to
| the client's browser allowing them to enjoy the creative
| and wonderful application we have prepared for them.
|
*/

$kernel = $app->make(illuminate\contracts\http\kernel::class);

$response = $kernel->handle(
    $request = illuminate\http\request::capture()
);

$response->send();

$kernel->terminate($request, $response);

    public function findfile($class)
    {
        // class map lookup
        if (isset($this->classmap[$class])) {
            return $this->classmap[$class];
        }
        if ($this->classmapauthoritative || isset($this->missingclasses[$class])) {
            return false;
        }
        if (null !== $this->apcuprefix) {
            $file = apcu_fetch($this->apcuprefix.$class, $hit);
            if ($hit) {
                return $file;
            }
        }

        $file = $this->findfilewithextension($class, '.php');

        // search for hack files if we are running on hhvm
        if (false === $file && defined('hhvm_version')) {
            $file = $this->findfilewithextension($class, '.hh');
        }

        if (null !== $this->apcuprefix) {
            apcu_add($this->apcuprefix.$class, $file);
        }

        if (false === $file) {
            // remember that this class does not exist.
            $this->missingclasses[$class] = true;
        }

        return $file;
    }

<?php/*
|--------------------------------------------------------------------------
| create the application
|--------------------------------------------------------------------------
|
| the first thing we will do is create a new laravel application instance
| which serves as the "glue" for all the components of laravel, and is
| the ioc container for the system binding all of the various parts.
|
*/

$app = new illuminate\foundation\application(
    realpath(__dir__.'/../')
);

/*
|--------------------------------------------------------------------------
| bind important interfaces
|--------------------------------------------------------------------------
|
| next, we need to bind some important interfaces into the container so
| we will be able to resolve them when needed. the kernels serve the
| incoming requests to this application from both the web and cli.
|
*/

$app->singleton(
    illuminate\contracts\http\kernel::class,
    app\http\kernel::class
);

$app->singleton(
    illuminate\contracts\console\kernel::class,
    app\console\kernel::class
);

$app->singleton(
    illuminate\contracts\debug\exceptionhandler::class,
    app\exceptions\handler::class
);

/*
|--------------------------------------------------------------------------
| return the application
|--------------------------------------------------------------------------
|
| this script returns the application instance. the instance is given to
| the calling script so we can separate the building of the instances
| from the actual running of the application and sending responses.
|
*/

return $app;

public function __construct($basepath = null)
    {
        if ($basepath) {
            $this->setbasepath($basepath);
        }

        $this->registerbasebindings();

        $this->registerbaseserviceproviders();

        $this->registercorecontaineraliases();
    }

protected function bindpathsincontainer()
    {
        $this->instance('path', $this->path());
        $this->instance('path.base', $this->basepath());
        $this->instance('path.lang', $this->langpath());
        $this->instance('path.config', $this->configpath());
        $this->instance('path.public', $this->publicpath());
        $this->instance('path.storage', $this->storagepath());
        $this->instance('path.database', $this->databasepath());
        $this->instance('path.resources', $this->resourcepath());
        $this->instance('path.bootstrap', $this->bootstrappath());
    }

protected function registerbasebindings()
    {
        static::setinstance($this);

        $this->instance('app', $this);

        $this->instance(container::class, $this);

        $this->instance(packagemanifest::class, new packagemanifest(
            new filesystem, $this->basepath(), $this->getcachedpackagespath()
        ));
    }

　　 protected function registerbaseserviceproviders()
    {
        $this->register(new eventserviceprovider($this));

        $this->register(new logserviceprovider($this));

        $this->register(new routingserviceprovider($this));
    }

　　  /**
     * handle an incoming http request.
     *
     * @param  \illuminate\http\request  $request
     * @return \illuminate\http\response
     */
    public function handle($request)
    {
        try {
            $request->enablehttpmethodparameteroverride();

            $response = $this->sendrequestthroughrouter($request);
        } catch (exception $e) {
            $this->reportexception($e);

            $response = $this->renderexception($request, $e);
        } catch (throwable $e) {
            $this->reportexception($e = new fatalthrowableerror($e));

            $response = $this->renderexception($request, $e);
        }

        $this->app['events']->dispatch(
            new events\requesthandled($request, $response)
        );

        return $response;
    }

    /**
     * send the given request through the middleware / router.
     *
     * @param  \illuminate\http\request  $request
     * @return \illuminate\http\response
     */
    protected function sendrequestthroughrouter($request)
    {
        $this->app->instance('request', $request);

        facade::clearresolvedinstance('request');

        $this->bootstrap();

        return (new pipeline($this->app))
                    ->send($request)
                    ->through($this->app->shouldskipmiddleware() ? [] : $this->middleware)
                    ->then($this->dispatchtorouter());
    }

protected $bootstrappers = [
        \illuminate\foundation\bootstrap\loadenvironmentvariables::class,
        \illuminate\foundation\bootstrap\loadconfiguration::class,
        \illuminate\foundation\bootstrap\handleexceptions::class,
        \illuminate\foundation\bootstrap\registerfacades::class,
        \illuminate\foundation\bootstrap\registerproviders::class,
        \illuminate\foundation\bootstrap\bootproviders::class,
    ];

public function bootstrapwith(array $bootstrappers)
    {
        $this->hasbeenbootstrapped = true;

        foreach ($bootstrappers as $bootstrapper) {
            $this['events']->fire('bootstrapping: '.$bootstrapper, [$this]);

            $this->make($bootstrapper)->bootstrap($this);

            $this['events']->fire('bootstrapped: '.$bootstrapper, [$this]);
        }
    }

return (new pipeline($this->app))
                    ->send($request)  // 设置需要分发的request
                    ->through($this->app->shouldskipmiddleware() ? [] : $this->middleware)　　// 设置request需要通过的中间件
                    ->then($this->dispatchtorouter());　　// 开始通过中间件

    /**
     * run the pipeline with a final destination callback.
     *
     * @param  \closure  $destination
     * @return mixed
     */
    public function then(closure $destination)
    {
        $pipeline = array_reduce(
            array_reverse($this->pipes), $this->carry(), $this->preparedestination($destination)
        );

        return $pipeline($this->passable);
    }

    protected function carry()
    {
        return function ($stack, $pipe) {
            return function ($passable) use ($stack, $pipe) {
                if (is_callable($pipe)) {
                    // if the pipe is an instance of a closure, we will just call it directly but
                    // otherwise we'll resolve the pipes out of the container and call it with
                    // the appropriate method and arguments, returning the results back out.
                    return $pipe($passable, $stack);
                } elseif (! is_object($pipe)) {
　　　　　　　　　　　　// $pipe是中间件的类名所以会进入这里，parsepipestring方法是解析中间件有没有携带参数，如果没有则$parameters是一个空数组。
                    list($name, $parameters) = $this->parsepipestring($pipe);

                    // if the pipe is a string we will parse the string and resolve the class out
                    // of the dependency injection container. we can then build a callable and
                    // execute the pipe function giving in the parameters that are required.
                    $pipe = $this->getcontainer()->make($name);　　　　// 从容器中解析出中间件类
　　　　　　　　　　　　
　　　　　　　　　　　　// $passable就是request, $stack就是包洋葱时包进来的闭包　　
                    $parameters = array_merge([$passable, $stack], $parameters);
                } else {
                    // if the pipe is already an object we'll just make a callable and pass it to
                    // the pipe as-is. there is no need to do any extra parsing and formatting
                    // since the object we're given was already a fully instantiated object.
                    $parameters = [$passable, $stack];
                }

　　　　　　　　　　// 如果中间件中有$this->method方法(其实就是handle方法)，则传入$parameters参数，执行handle方法。
                $response = method_exists($pipe, $this->method)
                                ? $pipe->{$this->method}(...$parameters)
                                : $pipe(...$parameters);

                return $response instanceof responsable
                            ? $response->toresponse($this->container->make(request::class))
                            : $response;
            };
        };

　　  /**
     * handle an incoming request.
     *
     * @param  \illuminate\http\request  $request
     * @param  \closure  $next
     * @return mixed
     *
     * @throws \symfony\component\httpkernel\exception\httpexception
     */
    public function handle($request, closure $next)
    {
　　　　　// 判断项目是否下线
        if ($this->app->isdownformaintenance()) {
            $data = json_decode(file_get_contents($this->app->storagepath().'/framework/down'), true);
　　　　　　　// 验证ip白名单
            if (isset($data['allowed']) && iputils::checkip($request->ip(), (array) $data['allowed'])) {
                return $next($request);
            }
　　　　　　　// 验证path是否在 $except 数组中
            if ($this->inexceptarray($request)) {
                return $next($request);
            }

            throw new maintenancemodeexception($data['time'], $data['retry'], $data['message']);
        }
　　　　　// 如果通过，则传request到闭包继续执行
        return $next($request);
    }

　　 /**
     * get the route dispatcher callback.
     *
     * @return \closure
     */
    protected function dispatchtorouter()
    {
        return function ($request) {
　　　　　　　// 向容器中放入实例request
            $this->app->instance('request', $request);

　　　　　　　// 通过\illuminate\routing\router的dispatch方法分发request
　　　　　　　return $this->router->dispatch($request); }; 
　　 }