Running Sage from other languages with high(er) performance?

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I finally realised that the Sage shell is a Python shell and that it's possible to run Sage inside a Python script. With this knowledge I was able to write a Python script that can execute Sage commands and uses sockets for inter-process communication.

I decided to write the script to act as much like running sage -c 'commmand' as possible. I copied most of the code from sage/local/sage-eval and paired it up with a Python socket example and ended with the following Python script:

import socket
import sys
from cStringIO import StringIO
from sage.all import *
from sage.calculus.predefined import x
from sage.misc.preparser import preparse

SHUTDOWN = False
HOST = 'localhost'
PORT = 8888
MAX_MSG_LENGTH = 102400

# Create socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print 'Socket created'

# Bind socket to localhost and port
try:
  s.bind((HOST, PORT))
except socket.error , msg:
  print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
  sys.exit()

print 'Socket bind complete'

# Start listening on socket
s.listen(10)
print 'Socket now listening'

# Loop listener for new connections
while not SHUTDOWN:
  # Wait to accept a new client connection
  conn, addr = s.accept()
  print 'Connected with ' + addr[0] + ':' + str(addr[1])

  # Receive message from client
  msg = conn.recv(MAX_MSG_LENGTH)
  if msg:
    if msg == "stop":
      SHUTDOWN = True
    else:
      parsed = preparse(msg)
      if parsed.startswith('load') or parsed.startswith('attach'):
        os.system('sage "' + os.path.join(os.getcwd(), parsed.split(None, 1)[1]) + '"')
      else:
        # Redirect stdout to my stdout to capture into a string
        sys.stdout = mystdout = StringIO()

        # Evalutate msg
        try:
          eval(compile(parsed,'<cmdline>','exec'))
          result = mystdout.getvalue() # Get result from mystdout
        except Exception as e:
          result = "ERROR: " + str(type(e)) + " " + str(e)

        # Restore stdout
        sys.stdout = sys.__stdout__

        # Send response to connected client
        if result == "":
          conn.sendall("Empty result, did you remember to print?")
        else:
          conn.sendall(result)

  # Close client connection
  conn.close()

# Close listener
s.close()

I saved the script to a file called sage-daemon.py in my Sage root folder. The stopmessage handler isn't really neccessary, but it's useful if anyone can "properly" daemonize the script (and also to avoid interrupting the script with CTRL+C, because that will leave the socket as in-use for a while after the script has been interrupted). See my other question http://ask.sagemath.org/question/2350... .

To run the script: sage -python sage-daemon.py This will leave the Sage shell waiting for socket input.

Here's a PHP script I used to test the functionality with:

<?php

$socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname("tcp"));
if (!$socket) die("Could not create socket\n");

$connected = socket_connect($socket, "localhost", 8888);
if (!$connected) echo "Not connected\n";
else {
  $msg = "print solve(5*x==3,x)";

  $sent = socket_send($socket, $msg, strlen($msg), 0);
  if (!$sent) echo "Error sending message\n";
  else {
    if ($msg != "stop"){
      $response = socket_read($socket, 1024);
      if (!$response) echo "Error receiving response\n";
      else echo $response . "\n";
    }
  }
}

socket_close($socket);

If successfull this should print ... (more)