D5430.1775281624.diff
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D5430.1775281624.diff
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	diff --git a/lib/ext/Syncroton/Command/FolderSync.php b/lib/ext/Syncroton/Command/FolderSync.php
	--- a/lib/ext/Syncroton/Command/FolderSync.php
	+++ b/lib/ext/Syncroton/Command/FolderSync.php
	@@ -119,7 +119,9 @@
	if ($this->_logger instanceof Zend_Log) {
	$this->_logger->info(__METHOD__ . '::' . __LINE__ . " already known synckey $syncKey provided ($retryCounter times)");
	}
	+ $sleepTime = 2;
	if ($retryCounter >= 10) {
	+ $sleepTime = 10;
	if ($this->_logger instanceof Zend_Log) {
	$this->_logger->warn(__METHOD__ . '::' . __LINE__ . " This client is stuck on resending the same FolderSync synckey.");
	}
	@@ -128,6 +130,10 @@
	$this->_syncState->extraData = json_encode($extraData);
	$this->_syncStateBackend->update($this->_syncState);
	}
	+ // Throttle clients that are stuck in a loop.
	+ // We shouldn't normally hit this codepath, so this does not have any impact on regular synchronization at all,
	+ // but protects us from too many requests from clients that are stuck in a loop.
	+ sleep($sleepTime);
	}
	}
	}