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GUACAMOLE-622: Increase size of instruction queue within FailoverGuacamoleSocket. Allow limit to be overridden.

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Some protocols, in particular SSH and telnet, may send a decent amount
of data before the connection status is known.
This commit is contained in:
Michael Jumper
2018-09-01 14:35:01 -07:00
parent a34bbcf637
commit e77ca735a0
1 changed files with 42 additions and 8 deletions
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50
guacamole-common/src/main/java/org/apache/guacamole/protocol/FailoverGuacamoleSocket.java
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@@ -49,11 +49,10 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
LoggerFactory.getLogger(FailoverGuacamoleSocket.class);
/**
* The maximum number of characters of Guacamole instruction data to store
* within the instruction queue while searching for errors. Once this limit
* is exceeded, the connection is assumed to be successful.
* The default maximum number of characters of Guacamole instruction data
* to store if no explicit limit is provided.
*/
private static final int INSTRUCTION_QUEUE_LIMIT = 2048;
private static final int DEFAULT_INSTRUCTION_QUEUE_LIMIT = 131072;
/**
* The wrapped socket being used.
@@ -131,9 +130,11 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
/**
* Creates a new FailoverGuacamoleSocket which reads Guacamole instructions
* from the given socket, searching for errors from the upstream remote
* desktop. If an upstream error is encountered, it is thrown as a
* desktop until the given instruction queue limit is reached. If an
* upstream error is encountered, it is thrown as a
* GuacamoleUpstreamException. This constructor will block until an error
* is encountered, or until the connection appears to have been successful.
* is encountered, until insufficient space remains in the instruction
* queue, or until the connection appears to have been successful.
* Once the FailoverGuacamoleSocket has been created, all reads, writes,
* etc. will be delegated to the provided socket.
*
@@ -141,6 +142,11 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
* The GuacamoleSocket of the Guacamole connection this
* FailoverGuacamoleSocket should handle.
*
* @param instructionQueueLimit
* The maximum number of characters of Guacamole instruction data to
* store within the instruction queue while searching for errors. Once
* this limit is exceeded, the connection is assumed to be successful.
*
* @throws GuacamoleException
* If an error occurs while reading data from the provided socket.
*
@@ -148,7 +154,8 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
* If the connection to guacd succeeded, but an error occurred while
* connecting to the remote desktop.
*/
public FailoverGuacamoleSocket(GuacamoleSocket socket)
public FailoverGuacamoleSocket(GuacamoleSocket socket,
final int instructionQueueLimit)
throws GuacamoleException, GuacamoleUpstreamException {
int totalQueueSize = 0;
@@ -177,7 +184,7 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
// Otherwise, track total data parsed, and assume connection is
// successful if no error encountered within reasonable space
totalQueueSize += instruction.toString().length();
if (totalQueueSize >= INSTRUCTION_QUEUE_LIMIT)
if (totalQueueSize >= instructionQueueLimit)
break;
}
@@ -186,6 +193,33 @@ public class FailoverGuacamoleSocket implements GuacamoleSocket {
}
/**
* Creates a new FailoverGuacamoleSocket which reads Guacamole instructions
* from the given socket, searching for errors from the upstream remote
* desktop until a maximum of 128KB of instruction data has been queued. If
* an upstream error is encountered, it is thrown as a
* GuacamoleUpstreamException. This constructor will block until an error
* is encountered, until insufficient space remains in the instruction
* queue, or until the connection appears to have been successful.
* Once the FailoverGuacamoleSocket has been created, all reads, writes,
* etc. will be delegated to the provided socket.
*
* @param socket
* The GuacamoleSocket of the Guacamole connection this
* FailoverGuacamoleSocket should handle.
*
* @throws GuacamoleException
* If an error occurs while reading data from the provided socket.
*
* @throws GuacamoleUpstreamException
* If the connection to guacd succeeded, but an error occurred while
* connecting to the remote desktop.
*/
public FailoverGuacamoleSocket(GuacamoleSocket socket)
throws GuacamoleException, GuacamoleUpstreamException {
this(socket, DEFAULT_INSTRUCTION_QUEUE_LIMIT);
}
/**
* GuacamoleReader which reads instructions from the queue populated when
* the FailoverGuacamoleSocket was constructed. Once the queue has been