seeseemelk opened a new issue, #774:
URL: https://github.com/apache/mina-sshd/issues/774
### Version
4160b6e3e394ff03f8439fb3202eb7cd7026a659
### Bug description
The following test results in the exception
`org.apache.sshd.common.io.WritePendingException: A write operation is already
pending; cannot write 29 bytes`.
This is regression is present since version
`4160b6e3e394ff03f8439fb3202eb7cd7026a659` and is still present in `2.15.0`.
(Note: I removed the actual keypair and passphrase that is being used in my
test.)
The test file is roughly eight megabytes in size.
```java
public final class MyTest {
private static final String FILENAME = "myfile.bin";
private static final String KEYPAIR
= "keypair_in_base64";
private static final String PASSPHRASE = "passphrase";
@Test
void myTest() throws IOException, GeneralSecurityException {
KeyPairResourceLoader loader =
SecurityUtils.getKeyPairResourceParser();
Collection<KeyPair> keys = loader.loadKeyPairs(null,
null,
FilePasswordProvider.of(PASSPHRASE),
new BufferedReader(new InputStreamReader(new
ByteArrayInputStream(Base64.getDecoder().decode(KEYPAIR)))));
KeyPair keypair = keys.iterator().next();
SshClient sshClient = ClientBuilder.builder()
.serverKeyVerifier((session, socketAddress, serverKey) ->
true)
.hostConfigEntryResolver(HostConfigEntryResolver.EMPTY)
.build();
SimpleClient client = SshClient.wrapAsSimpleClient(sshClient);
sshClient.start();
ClientSession session = client.sessionLogin("localhost", 8235,
"app", keypair);
String fromLocation = "/src/" + FILENAME;
String toLocation = "/dest/" + FILENAME;
try (SftpClient sftp =
SftpClientFactory.instance().createSftpClient(session).singleSessionInstance())
{
try (InputStream input = sftp.read(fromLocation);
OutputStream output = sftp.write(toLocation,
SftpClient.OpenMode.Create, SftpClient.OpenMode.Write)) {
IOUtils.copy(input, output);
}
}
}
}
```
### Actual behavior
It throws the following exception:
`org.apache.sshd.common.io.WritePendingException: A write operation is already
pending; cannot write 29 bytes`
### Expected behavior
The test should pass without errors.
### Relevant log output
```Shell
org.apache.sshd.common.io.WritePendingException: A write operation is
already pending; cannot write 29 bytes
at
org.apache.sshd.common.channel.ChannelAsyncOutputStream.writeBuffer(ChannelAsyncOutputStream.java:110)
at
org.apache.sshd.sftp.client.impl.DefaultSftpClient.write(DefaultSftpClient.java:308)
at
org.apache.sshd.sftp.client.impl.DefaultSftpClient.send(DefaultSftpClient.java:272)
at
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.sendRequests(SftpInputStreamAsync.java:255)
at
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.doRead(SftpInputStreamAsync.java:195)
at
org.apache.sshd.sftp.client.impl.SftpInputStreamAsync.read(SftpInputStreamAsync.java:137)
at java.base/java.io.InputStream.read(InputStream.java:220)
at
org.testcontainers.shaded.org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2314)
at
org.testcontainers.shaded.org.apache.commons.io.IOUtils.copy(IOUtils.java:2270)
at
org.testcontainers.shaded.org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2291)
at
org.testcontainers.shaded.org.apache.commons.io.IOUtils.copy(IOUtils.java:2246)
at org.apache.sshd.sftp.client.MyTest.myTest(MyTest.java:77)
```
### Other information
The test communicates with OpenSSH_9.2p1 Debian-2, OpenSSL 3.0.8 7 Feb 2023
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