Fix insane-memory-limit handling in StreamHandler, fixes #1592

src/Monolog/Handler/StreamHandler.php

@@ -26,9 +26,11 @@ use Monolog\Utils;
 class StreamHandler extends AbstractProcessingHandler
 {
     /** @const int */
-    protected const MAX_CHUNK_SIZE = 100 * 1024 * 1024;
+    protected const MAX_CHUNK_SIZE = 2147483647;
+    /** @const int 10MB */
+    protected const DEFAULT_CHUNK_SIZE = 10 * 1024 * 1024;
     /** @var int */
-    protected $streamChunkSize = self::MAX_CHUNK_SIZE;
+    protected $streamChunkSize;
     /** @var resource|null */
     protected $stream;
     /** @var ?string */
@@ -55,13 +57,15 @@ class StreamHandler extends AbstractProcessingHandler
 
         if (($phpMemoryLimit = Utils::expandIniShorthandBytes(ini_get('memory_limit'))) !== false) {
             if ($phpMemoryLimit > 0) {
-                // use max 10% of allowed memory for the chunk size
-                $this->streamChunkSize = max((int) ($phpMemoryLimit / 10), 10*1024);
+                // use max 10% of allowed memory for the chunk size, and at least 100KB
+                $this->streamChunkSize = min(static::MAX_CHUNK_SIZE, max((int) ($phpMemoryLimit / 10), 100 * 1024));
+            } else {
+                // memory is unlimited, set to the default 10MB
+                $this->streamChunkSize = static::DEFAULT_CHUNK_SIZE;
             }
-            // else memory is unlimited, keep the buffer to the default 100MB
         } else {
-            // no memory limit information, use a conservative 10MB
-            $this->streamChunkSize = 10*10*1024;
+            // no memory limit information, set to the default 10MB
+            $this->streamChunkSize = static::DEFAULT_CHUNK_SIZE;
         }
 
         if (is_resource($stream)) {