"stdin" and "stdout" available on the child process are buffer that inherit
from EventEmitter (well they are streams, unless you change their behavior
when creating the spawned child). As mentioned by Dominic you need to add
event listeners to the data events of the stdout and stderr so you can see
what the FTP process writes. You then need to parse it and write to the
stdin stream while again listening to the stdout and making sure you
received the complete response to the command you sent.
just be careful not to get into a situation, as you have in your example,
where you register multiple listeners to the same event performing
different tasks. In your example, the outer and inner listeners on stdout
data event will be called when you write "ls" and when you write "rename".
You'll get into an infinite loop very quickly.
I think you need to create a single data handler that will deal with
processing of all expected output from the FTP process based on all
possible FTP commands you plan to use. Try to make it as generic as
possible so regardless if you did "ls /tmp" or "ls /home" the processing
within the data handler will be the same. You'll need to maintain some
structure outside of the data handler to deal with passing that information
back to the calling function (via callbacks or events).
If you really want to you can build a TCP server instead that implements
the FTP protocol. Maybe even easier is to copy what other FTP modules did
and just refresh the code and make it your own.
Roy
On Monday, July 30, 2012 7:01:43 AM UTC-4, carlton wrote:
>
> Hi there,
>
> I am trying to implent a nodejs script that connects to one of our servers
> using sftp.
>
> So far I can connect using child process and spawning a command such as...
>
> sftp -o Port=22-o PasswordAuthentication=no-o
> UserKnownHostsFile=/home/carlton/.ssh/known_hosts-o
> IdentityFile=private_key-o StrictHostKeyChecking=no-o
> BatchMode=nodeploy@46.x.x.x:/home/carlton/to_process
>
> Now this is the part that has me confused...
>
> I then need to execute commands on the ftp server (e.g. list files, rename
> files) so I listen to the 'data' event....
>
> sftp.stdout.on('data', function (data) {
> console.log('stdout: ' + data);
>
> sftp.stdin.write("ls -l\r\n");
>
> sftp.stdout.on('data', function(data){
> console.log('File list:', data.toString());
>
> // Parse file names here
>
> sftp.stdin.write("rename
> /home/carlton/FTP_test/to_process/old.php /home/ carlton
> /FTP_test/processed/new.php\n");
> });
> });
>
> Is this the correct way to structure things (i.e. creatiung event listener
> again for the 'data' event within the callback of the previous 'data' event
> listener)?
> I found it hard to find any examples similar to what I need to do which
> made me think I haven't built this as it should have been.
>
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