[OE-core] [RFC PATCH 4/8] lib/oeqa/utils/oetelnetlib.py: override Telnet class to use Unix domain sockets

[Paul Eggleton]

On Friday 28 June 2013 13:04:39 Stefan Stanacar wrote:
> Python's telnetlib Telnet class connects only to AF_INET sockets, but we
> want to use Unix domain socket for the qemu serial connection.
> Also add a new read_all_timeout method similar to Telnet's read_all
> 
> Signed-off-by: Stefan Stanacar <stefanx.stanacar at intel.com>
> ---
>  meta/lib/oeqa/utils/oetelnetlib.py | 49
> ++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+)
>  create mode 100644 meta/lib/oeqa/utils/oetelnetlib.py
> 
> diff --git a/meta/lib/oeqa/utils/oetelnetlib.py
> b/meta/lib/oeqa/utils/oetelnetlib.py new file mode 100644
> index 0000000..cdebac1
> --- /dev/null
> +++ b/meta/lib/oeqa/utils/oetelnetlib.py
> @@ -0,0 +1,49 @@
> +import socket
> +import time
> +import re
> +from telnetlib import Telnet
> +
> +class oeTelnet(Telnet):
> +
> +    """
> +    Override Telnet class to use unix domain sockets,
> +    Telnet uses AF_INET for socket, we don't want that.
> +    Also, provide a read_all variant with timeout, that
> +    returns whatever output there is.
> +    """
> +
> +    def __init__(self, stream=None, logfile=None):
> +
> +        Telnet.__init__(self, host=None)
> +        self.stream = stream
> +        self.logfile = logfile
> +        if stream is not None:
> +            self.open(stream)
> +
> +    def log(self, msg):
> +        if self.logfile:
> +            with open(self.logfile, "a") as f:
> +                f.write("%s\n" % msg)
> +
> +    def open(self, stream):
> +
> +        self.eof = 0
> +        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
> +        self.sock.connect(stream)
> +
> +    def read_all_timeout(self, match, timeout=120):
> +        """Read until EOF or until timeout or until match.
> +        """
> +        ret = False
> +        self.process_rawq()
> +        endtime = time.time() + timeout
> +        while not self.eof and time.time() < endtime:
> +            self.fill_rawq()
> +            self.process_rawq()
> +            if re.search(match, self.cookedq):
> +                ret = True
> +                break
> +        buf = self.cookedq
> +        self.cookedq = ''
> +        self.log(buf)
> +        return (ret, buf)

Just a minor bit of feedback about this; I think it's probably best not to 
call it something relating to "telnet" since it's no longer really telnet when 
using unix domain sockets.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre