perfah created SSHD-1352:
----------------------------
Summary: Paradoxical 'Client is closed' while SshClient::isOpen
returns true
Key: SSHD-1352
URL: https://issues.apache.org/jira/browse/SSHD-1352
Project: MINA SSHD
Issue Type: Bug
Affects Versions: 2.15.0
Reporter: perfah
We are seeing this stacktrace in our logs:
{code:java}
java.io.UncheckedIOException: java.io.IOException:
readDir(/TLWPT/OrderRouting/To: 31) client is closed
at
org.apache.sshd.sftp.client.impl.SftpDirEntryIterator.load(SftpDirEntryIterator.java:181)
at
org.apache.sshd.sftp.client.impl.SftpDirEntryIterator.next(SftpDirEntryIterator.java:120)
at
org.apache.sshd.sftp.client.impl.SftpDirEntryIterator.next(SftpDirEntryIterator.java:45)
at
org.apache.sshd.sftp.client.fs.SftpPathIterator.nextEntry(SftpPathIterator.java:110)
at
org.apache.sshd.sftp.client.fs.SftpPathIterator.next(SftpPathIterator.java:104)
at
org.apache.sshd.sftp.client.fs.SftpPathIterator.next(SftpPathIterator.java:39)
at java.base/java.nio.file.Files$2.next(Files.java:3802)
at java.base/java.nio.file.Files$2.next(Files.java:3790)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133){code}
Yet our code for detecting that the client has been closed appears to not work
(we see no recycled clients in our logs):
{code:java}
if (!clients.get(clientIdentity).isOpen()) {
...
LOGGER.debug("Recycled SFTP Client: {}", clientIdentity);
}{code}
I made a brief investigation by asking an LLM about the MINA repository, and
according to it, the apparent contradiction can be resolved when you consider
that _isOpen_ only reflects the status when you close it from the outside
(implicitly via _try-with-resources_ or explicitly by doing {_}close(){_}),
However, if the client is closed due to an internal reason (e.g. TCP connection
is closed), the closed-status appears to not propagate up.
1. Can you confirm that this is the case? Or am I missing something?
2. Do you agree that _SshClient::isOpen_ should reflect the correct status even
if the client is closed for an internal reason?
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