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Update shared memory error handling

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Related to #100.
This commit is contained in:
Aaron Piotrowski 2020-02-27 23:19:55 -06:00
parent 15ead6c976
commit 6e310d0219
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GPG Key ID: ADD1EF783EDE9EEB
2 changed files with 89 additions and 34 deletions
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71
lib/Sync/SharedMemoryParcel.php
View File

@ -6,6 +6,7 @@ use Amp\Failure;
use Amp\Promise;
use Amp\Success;
use Amp\Sync\PosixSemaphore;
use Amp\Sync\SyncException;
use function Amp\call;
/**
@ -50,7 +51,7 @@ final class SharedMemoryParcel implements Parcel
/** @var PosixSemaphore A semaphore for synchronizing on the parcel. */
private $semaphore;
/** @var int An open handle to the shared memory segment. */
/** @var resource|null An open handle to the shared memory segment. */
private $handle;
/** @var int */
@ -64,6 +65,10 @@ final class SharedMemoryParcel implements Parcel
* @param int $permissions Permissions to access the semaphore. Use file permission format specified as 0xxx.
*
* @return self
*
* @throws SharedMemoryException
* @throws SyncException
* @throws \Error If the size or permissions are invalid.
*/
public static function create(string $id, $value, int $size = 8192, int $permissions = 0600): self
{
@ -76,6 +81,8 @@ final class SharedMemoryParcel implements Parcel
* @param string $id
*
* @return self
*
* @throws SharedMemoryException
*/
public static function use(string $id): self
{
@ -85,21 +92,12 @@ final class SharedMemoryParcel implements Parcel
}
/**
* Creates a new local object container.
*
* The object given will be assigned a new object ID and will have a
* reference to it stored in memory local to the thread.
*
* @param mixed $value The value to store in the container.
* @param int $size The number of bytes to allocate for the object.
* If not specified defaults to 16384 bytes.
* @param int $permissions The access permissions to set for the object.
* If not specified defaults to 0600.
* @param string $id
*/
private function __construct(string $id)
{
if (!\extension_loaded("shmop")) {
throw new \Error(__CLASS__ . " requires the shmop extension.");
throw new \Error(__CLASS__ . " requires the shmop extension");
}
$this->id = $id;
@ -110,9 +108,21 @@ final class SharedMemoryParcel implements Parcel
* @param mixed $value
* @param int $size
* @param int $permissions
*
* @throws SharedMemoryException
* @throws SyncException
* @throws \Error If the size or permissions are invalid.
*/
private function init($value, int $size = 8192, int $permissions = 0600): void
{
if ($size <= 0) {
throw new \Error('The memory size must be greater than 0');
}
if ($permissions <= 0 || $permissions > 0777) {
throw new \Error('Invalid permissions');
}
$this->semaphore = PosixSemaphore::create($this->id, 1);
$this->initializer = \getmypid();
@ -153,20 +163,24 @@ final class SharedMemoryParcel implements Parcel
*/
public function unwrap(): Promise
{
try {
if ($this->isFreed()) {
return new Failure(new SharedMemoryException('The object has already been freed.'));
throw new SharedMemoryException('The object has already been freed');
}
$header = $this->getHeader();
// Make sure the header is in a valid state and format.
if ($header['state'] !== self::STATE_ALLOCATED || $header['size'] <= 0) {
new Failure(new SharedMemoryException('Shared object memory is corrupt.'));
throw new SharedMemoryException('Shared object memory is corrupt');
}
// Read the actual value data from memory and unserialize it.
$data = $this->memGet(self::MEM_DATA_OFFSET, $header['size']);
return new Success(\unserialize($data));
} catch (\Exception $exception) {
return new Failure($exception);
}
}
/**
@ -180,7 +194,7 @@ final class SharedMemoryParcel implements Parcel
private function wrap($value): void
{
if ($this->isFreed()) {
throw new SharedMemoryException('The object has already been freed.');
throw new SharedMemoryException('The object has already been freed');
}
$serialized = \serialize($value);
@ -278,6 +292,8 @@ final class SharedMemoryParcel implements Parcel
/**
* Updates the current memory segment handle, handling any moves made on the
* data.
*
* @throws SharedMemoryException
*/
private function handleMovedMemory(): void
{
@ -302,6 +318,8 @@ final class SharedMemoryParcel implements Parcel
* Reads and returns the data header at the current memory segment.
*
* @return array An associative array of header data.
*
* @throws SharedMemoryException
*/
private function getHeader(): array
{
@ -315,6 +333,8 @@ final class SharedMemoryParcel implements Parcel
* @param int $state An object state.
* @param int $size The size of the stored data, or other value.
* @param int $permissions The permissions mask on the memory segment.
*
* @throws SharedMemoryException
*/
private function setHeader(int $state, int $size, int $permissions): void
{
@ -329,13 +349,16 @@ final class SharedMemoryParcel implements Parcel
* @param string $mode The mode to open the shared memory in.
* @param int $permissions Process permissions on the shared memory.
* @param int $size The size to crate the shared memory in bytes.
*
* @throws SharedMemoryException
*/
private function memOpen(int $key, string $mode, int $permissions, int $size): void
{
$this->handle = @\shmop_open($key, $mode, $permissions, $size);
if ($this->handle === false) {
throw new SharedMemoryException('Failed to create shared memory block.');
$handle = @\shmop_open($key, $mode, $permissions, $size);
if ($handle === false) {
throw new SharedMemoryException('Failed to create shared memory block');
}
$this->handle = $handle;
}
/**
@ -345,12 +368,14 @@ final class SharedMemoryParcel implements Parcel
* @param int $size The number of bytes to read.
*
* @return string The binary data at the given offset.
*
* @throws SharedMemoryException
*/
private function memGet(int $offset, int $size): string
{
$data = \shmop_read($this->handle, $offset, $size);
if ($data === false) {
throw new SharedMemoryException('Failed to read from shared memory block.');
throw new SharedMemoryException('Failed to read from shared memory block');
}
return $data;
}
@ -360,21 +385,25 @@ final class SharedMemoryParcel implements Parcel
*
* @param int $offset The offset to write to.
* @param string $data The binary data to write.
*
* @throws SharedMemoryException
*/
private function memSet(int $offset, string $data): void
{
if (!\shmop_write($this->handle, $data, $offset)) {
throw new SharedMemoryException('Failed to write to shared memory block.');
throw new SharedMemoryException('Failed to write to shared memory block');
}
}
/**
* Requests the shared memory segment to be deleted.
*
* @throws SharedMemoryException
*/
private function memDelete(): void
{
if (!\shmop_delete($this->handle)) {
throw new SharedMemoryException('Failed to discard shared memory block.');
throw new SharedMemoryException('Failed to discard shared memory block');
}
}

30
test/Sync/SharedMemoryParcelTest.php
View File

@ -6,6 +6,7 @@ use Amp\Delayed;
use Amp\Parallel\Context\Process;
use Amp\Parallel\Sync\Parcel;
use Amp\Parallel\Sync\SharedMemoryParcel;
use Amp\Sync\SyncException;
/**
* @requires extension shmop
@ -28,7 +29,7 @@ class SharedMemoryParcelTest extends AbstractParcelTest
$this->parcel = null;
}
public function testObjectOverflowMoved()
public function testObjectOverflowMoved(): \Generator
{
$object = SharedMemoryParcel::create(self::ID, 'hi', 2);
yield $object->synchronized(function () {
@ -42,7 +43,7 @@ class SharedMemoryParcelTest extends AbstractParcelTest
* @group posix
* @requires extension pcntl
*/
public function testSetInSeparateProcess()
public function testSetInSeparateProcess(): \Generator
{
$object = SharedMemoryParcel::create(self::ID, 42);
@ -61,4 +62,29 @@ class SharedMemoryParcelTest extends AbstractParcelTest
$this->assertSame(44, yield $process->join()); // Wait for child process to finish.
$this->assertEquals(44, yield $object->unwrap());
}
public function testInvalidSize(): void
{
$this->expectException(\Error::class);
$this->expectExceptionMessage('size must be greater than 0');
SharedMemoryParcel::create(self::ID, 42, -1);
}
public function testInvalidPermissions(): void
{
$this->expectException(\Error::class);
$this->expectExceptionMessage('Invalid permissions');
SharedMemoryParcel::create(self::ID, 42, 8192, 0);
}
public function testNotFound(): void
{
$this->expectException(SyncException::class);
$this->expectExceptionMessage('No semaphore with that ID found');
SharedMemoryParcel::use('invalid');
}
}