Explicitly close fedora flysystem connections (#852)

* Explicitly close fedora flysystem connections

* fixing tests

src/Flysystem/Adapter/FedoraAdapter.php

@@ -50,7 +50,7 @@ class FedoraAdapter implements AdapterInterface {
    * {@inheritdoc}
    */
   public function has($path) {
-    $response = $this->fedora->getResourceHeaders($path);
+    $response = $this->fedora->getResourceHeaders($path, ['Connection' => 'close']);
     return $response->getStatusCode() == 200;
   }
 
@@ -77,7 +77,7 @@ class FedoraAdapter implements AdapterInterface {
    * {@inheritdoc}
    */
   public function readStream($path) {
-    $response = $this->fedora->getResource($path);
+    $response = $this->fedora->getResource($path, ['Connection' => 'close']);
 
     if ($response->getStatusCode() != 200) {
       return FALSE;
@@ -96,7 +96,7 @@ class FedoraAdapter implements AdapterInterface {
    * {@inheritdoc}
    */
   public function getMetadata($path) {
-    $response = $this->fedora->getResourceHeaders($path);
+    $response = $this->fedora->getResourceHeaders($path, ['Connection' => 'close']);
 
     if ($response->getStatusCode() != 200) {
       return FALSE;
@@ -184,7 +184,10 @@ class FedoraAdapter implements AdapterInterface {
       return [];
     }
     // Get the resource from Fedora.
-    $response = $this->fedora->getResource($normalized, ['Accept' => 'application/ld+json']);
+    $response = $this->fedora->getResource($normalized, [
+      'Accept' => 'application/ld+json',
+      'Connection' => 'close',
+    ]);
     $jsonld = (string) $response->getBody();
     $graph = json_decode($jsonld, TRUE);
 
@@ -379,7 +382,7 @@ class FedoraAdapter implements AdapterInterface {
    *   NULL if no tombstone, TRUE if tombstone deleted, FALSE otherwise.
    */
   private function deleteTombstone($path) {
-    $response = $this->fedora->getResourceHeaders($path);
+    $response = $this->fedora->getResourceHeaders($path, ['Connection' => 'close']);
     $return = NULL;
     if ($response->getStatusCode() == 410) {
       $return = FALSE;

tests/src/Kernel/FedoraAdapterTest.php

@@ -51,8 +51,8 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $response = $prophecy->reveal();
 
     $prophecy = $this->prophesize(IFedoraApi::class);
-    $prophecy->getResourceHeaders('')->willReturn($response);
-    $prophecy->getResource('')->willReturn($response);
+    $prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($response);
+    $prophecy->getResource('', ['Connection' => 'close'])->willReturn($response);
     $api = $prophecy->reveal();
 
     $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)
@@ -69,8 +69,8 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $response = $prophecy->reveal();
 
     $prophecy = $this->prophesize(IFedoraApi::class);
-    $prophecy->getResourceHeaders('')->willReturn($response);
-    $prophecy->getResource('')->willReturn($response);
+    $prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($response);
+    $prophecy->getResource('', ['Connection' => 'close'])->willReturn($response);
     $api = $prophecy->reveal();
 
     $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)
@@ -95,7 +95,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $response = $prophecy->reveal();
 
     $prophecy = $this->prophesize(IFedoraApi::class);
-    $prophecy->getResourceHeaders('')->willReturn($response);
+    $prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($response);
     $api = $prophecy->reveal();
 
     $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)
@@ -122,7 +122,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
 
     $prophecy = $this->createAdapterBase();
 
-    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($prophecy->reveal());
 
     $api = $fedora_prophecy->reveal();
 
@@ -139,7 +139,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $fedora_prophecy = $this->prophesize(IFedoraApi::class);
     $prophecy = $this->prophesize(Response::class);
     $prophecy->getStatusCode()->willReturn(500);
-    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($prophecy->reveal());
 
     $prophecy = $this->prophesize(Response::class);
     $prophecy->getStatusCode()->willReturn(500);
@@ -176,7 +176,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
         '<http://www.w3.org/ns/ldp#RDFSource>;rel="type"',
       ]);
 
-    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($prophecy->reveal());
 
     $api = $fedora_prophecy->reveal();
 
@@ -196,7 +196,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $prophecy->getStatusCode()->willReturn(204);
 
     $fedora_prophecy->deleteResource('')->willReturn($prophecy->reveal());
-    $fedora_prophecy->getResourceHeaders('')->willReturn($prophecy->reveal());
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])->willReturn($prophecy->reveal());
     $api = $fedora_prophecy->reveal();
 
     $mime_guesser = $this->prophesize(MimeTypeGuesserInterface::class)
@@ -242,7 +242,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $tombstone_prophecy->getStatusCode()->willReturn(204);
 
     $fedora_prophecy->deleteResource('')->willReturn($prophecy->reveal());
-    $fedora_prophecy->getResourceHeaders('')
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])
       ->willReturn($head_prophecy->reveal());
     $fedora_prophecy->deleteResource('some-path-to-a-tombstone')
       ->willReturn($tombstone_prophecy->reveal());
@@ -273,7 +273,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $tombstone_prophecy->getStatusCode()->willReturn(500);
 
     $fedora_prophecy->deleteResource('')->willReturn($prophecy->reveal());
-    $fedora_prophecy->getResourceHeaders('')
+    $fedora_prophecy->getResourceHeaders('', ['Connection' => 'close'])
       ->willReturn($head_prophecy->reveal());
     $fedora_prophecy->deleteResource('some-path-to-a-tombstone')
       ->willReturn($tombstone_prophecy->reveal());
@@ -606,7 +606,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $response = $prophecy->reveal();
 
     $fedora_prophecy = $this->prophesize(IFedoraApi::class);
-    $fedora_prophecy->getResource(Argument::any())->willReturn($response);
+    $fedora_prophecy->getResource(Argument::any(), ['Connection' => 'close'])->willReturn($response);
 
     $prophecy = $this->prophesize(Response::class);
     $prophecy->getStatusCode()->willReturn(201);
@@ -633,7 +633,7 @@ class FedoraAdapterTest extends IslandoraKernelTestBase {
     $prophecy->getHeader('Content-Length')->willReturn([strlen("DERP")]);
     $response = $prophecy->reveal();
 
-    $fedora_prophecy->getResourceHeaders(Argument::any())
+    $fedora_prophecy->getResourceHeaders(Argument::any(), ['Connection' => 'close'])
       ->willReturn($response);
 
     $prophecy = $this->prophesize(Response::class);