Spring Cloud App Starter, sftp source, recurse a directory for files - spring-integration

Question

I am using SFTP Source in Spring cloud dataflow and it is working for getting files define in sftp:remote-dir:/home/someone/source , Now I have a many subfolders under the remote-dir and I want to recursively get all the files under this directory which match the patten. I am trying to use filename-regex: but so far it only works on one level. How do I recursively get the files I need.

Answer 1

The inbound channel adapter does not support recursion; use a custom source with the outbound gateway with an MGET command, with recursion (-R).
The doc is missing that option; fixed in the current docs.
I opened an issue to create a standard app starter.
EDIT
With the Java DSL...
#SpringBootApplication
#EnableBinding(Source.class)
public class So44710754Application {
public static void main(String[] args) {
SpringApplication.run(So44710754Application.class, args);
}
// should store in Redis or similar for persistence
private final ConcurrentMap<String, Boolean> processed = new ConcurrentHashMap<>();
#Bean
public IntegrationFlow flow() {
return IntegrationFlows.from(source(), e -> e.poller(Pollers.fixedDelay(30_000)))
.handle(gateway())
.split()
.<File>filter(p -> this.processed.putIfAbsent(p.getAbsolutePath(), true) == null)
.transform(Transformers.fileToByteArray())
.channel(Source.OUTPUT)
.get();
}
private MessageSource<String> source() {
return () -> new GenericMessage<>("foo/*");
}
private AbstractRemoteFileOutboundGateway<LsEntry> gateway() {
AbstractRemoteFileOutboundGateway<LsEntry> gateway = Sftp.outboundGateway(sessionFactory(), "mget", "payload")
.localDirectory(new File("/tmp/foo"))
.options(Option.RECURSIVE)
.get();
gateway.setFileExistsMode(FileExistsMode.IGNORE);
return gateway;
}
private SessionFactory<LsEntry> sessionFactory() {
DefaultSftpSessionFactory sf = new DefaultSftpSessionFactory();
sf.setHost("10.0.0.3");
sf.setUser("ftptest");
sf.setPassword("ftptest");
sf.setAllowUnknownKeys(true);
return new CachingSessionFactory<>(sf);
}
}
And with Java config...
#SpringBootApplication
#EnableBinding(Source.class)
public class So44710754Application {
public static void main(String[] args) {
SpringApplication.run(So44710754Application.class, args);
}
#InboundChannelAdapter(channel = "sftpGate", poller = #Poller(fixedDelay = "30000"))
public String remoteDir() {
return "foo/*";
}
#Bean
#ServiceActivator(inputChannel = "sftpGate")
public SftpOutboundGateway mgetGate() {
SftpOutboundGateway sftpOutboundGateway = new SftpOutboundGateway(sessionFactory(), "mget", "payload");
sftpOutboundGateway.setOutputChannelName("splitterChannel");
sftpOutboundGateway.setFileExistsMode(FileExistsMode.IGNORE);
sftpOutboundGateway.setLocalDirectory(new File("/tmp/foo"));
sftpOutboundGateway.setOptions("-R");
return sftpOutboundGateway;
}
#Bean
#Splitter(inputChannel = "splitterChannel")
public DefaultMessageSplitter splitter() {
DefaultMessageSplitter splitter = new DefaultMessageSplitter();
splitter.setOutputChannelName("filterChannel");
return splitter;
}
// should store in Redis, Zookeeper, or similar for persistence
private final ConcurrentMap<String, Boolean> processed = new ConcurrentHashMap<>();
#Filter(inputChannel = "filterChannel", outputChannel = "toBytesChannel")
public boolean filter(File payload) {
return this.processed.putIfAbsent(payload.getAbsolutePath(), true) == null;
}
#Bean
#Transformer(inputChannel = "toBytesChannel", outputChannel = Source.OUTPUT)
public FileToByteArrayTransformer toBytes() {
FileToByteArrayTransformer transformer = new FileToByteArrayTransformer();
return transformer;
}
private SessionFactory<LsEntry> sessionFactory() {
DefaultSftpSessionFactory sf = new DefaultSftpSessionFactory();
sf.setHost("10.0.0.3");
sf.setUser("ftptest");
sf.setPassword("ftptest");
sf.setAllowUnknownKeys(true);
return new CachingSessionFactory<>(sf);
}
}