make README a bit more comprehensive and rename example/ as experiments/

2 files changed, 534 insertions, 0 deletions

diff --git a/experiments/cursesio.py b/experiments/cursesio.py
new file mode 100644
index 0000000000..83b4a9f186
--- /dev/null
+++ b/experiments/cursesio.py
@@ -0,0 +1,154 @@
+import curses
+import curses.wrapper
+from curses.ascii import isprint
+
+from twisted.internet import reactor
+
+
+class CursesStdIO():
+    def __init__(self, stdscr, callback=None):
+        self.statusText = "Synapse test app -"
+        self.searchText = ''
+        self.stdscr = stdscr
+
+        self.logLine = ''
+
+        self.callback = callback
+
+        self._setup()
+
+    def _setup(self):
+        self.stdscr.nodelay(1)  # Make non blocking
+
+        self.rows, self.cols = self.stdscr.getmaxyx()
+        self.lines = []
+
+        curses.use_default_colors()
+
+        self.paintStatus(self.statusText)
+        self.stdscr.refresh()
+
+    def set_callback(self, callback):
+        self.callback = callback
+
+    def fileno(self):
+        """ We want to select on FD 0 """
+        return 0
+
+    def connectionLost(self, reason):
+        self.close()
+
+    def print_line(self, text):
+        """ add a line to the internal list of lines"""
+
+        self.lines.append(text)
+        self.redraw()
+
+    def print_log(self, text):
+        self.logLine = text
+        self.redraw()
+
+    def redraw(self):
+        """ method for redisplaying lines
+            based on internal list of lines """
+
+        self.stdscr.clear()
+        self.paintStatus(self.statusText)
+        i = 0
+        index = len(self.lines) - 1
+        while i < (self.rows - 3) and index >= 0:
+            self.stdscr.addstr(self.rows - 3 - i, 0, self.lines[index],
+                               curses.A_NORMAL)
+            i = i + 1
+            index = index - 1
+
+        self.printLogLine(self.logLine)
+
+        self.stdscr.refresh()
+
+    def paintStatus(self, text):
+        if len(text) > self.cols:
+            raise RuntimeError("TextTooLongError")
+
+        self.stdscr.addstr(
+            self.rows - 2, 0,
+            text + ' ' * (self.cols - len(text)),
+            curses.A_STANDOUT)
+
+    def printLogLine(self, text):
+        self.stdscr.addstr(
+            0, 0,
+            text + ' ' * (self.cols - len(text)),
+            curses.A_STANDOUT)
+
+    def doRead(self):
+        """ Input is ready! """
+        curses.noecho()
+        c = self.stdscr.getch()  # read a character
+
+        if c == curses.KEY_BACKSPACE:
+            self.searchText = self.searchText[:-1]
+
+        elif c == curses.KEY_ENTER or c == 10:
+            text = self.searchText
+            self.searchText = ''
+
+            self.print_line(">> %s" % text)
+
+            try:
+                if self.callback:
+                    self.callback.on_line(text)
+            except Exception as e:
+                self.print_line(str(e))
+
+            self.stdscr.refresh()
+
+        elif isprint(c):
+            if len(self.searchText) == self.cols - 2:
+                return
+            self.searchText = self.searchText + chr(c)
+
+        self.stdscr.addstr(self.rows - 1, 0,
+                           self.searchText + (' ' * (
+                           self.cols - len(self.searchText) - 2)))
+
+        self.paintStatus(self.statusText + ' %d' % len(self.searchText))
+        self.stdscr.move(self.rows - 1, len(self.searchText))
+        self.stdscr.refresh()
+
+    def logPrefix(self):
+        return "CursesStdIO"
+
+    def close(self):
+        """ clean up """
+
+        curses.nocbreak()
+        self.stdscr.keypad(0)
+        curses.echo()
+        curses.endwin()
+
+
+class Callback(object):
+
+    def __init__(self, stdio):
+        self.stdio = stdio
+
+    def on_line(self, text):
+        self.stdio.print_line(text)
+
+
+def main(stdscr):
+    screen = CursesStdIO(stdscr)   # create Screen object
+
+    callback = Callback(screen)
+
+    screen.set_callback(callback)
+
+    stdscr.refresh()
+    reactor.addReader(screen)
+    reactor.run()
+    screen.close()
+
+
+if __name__ == '__main__':
+    curses.wrapper(main)
diff --git a/experiments/test_messaging.py b/experiments/test_messaging.py
new file mode 100644
index 0000000000..9a45425173
--- /dev/null
+++ b/experiments/test_messaging.py
@@ -0,0 +1,380 @@
+# -*- coding: utf-8 -*-
+
+""" This is an example of using the server to server implementation to do a
+basic chat style thing. It accepts commands from stdin and outputs to stdout.
+
+It assumes that ucids are of the form <user>@<domain>, and uses <domain> as
+the address of the remote home server to hit.
+
+Usage:
+    python test_messaging.py <port>
+
+Currently assumes the local address is localhost:<port>
+
+"""
+
+
+from synapse.federation import (
+    ReplicationHandler
+)
+
+from synapse.federation.units import Pdu
+
+from synapse.util import origin_from_ucid
+
+from synapse.app.homeserver import SynapseHomeServer
+
+#from synapse.util.logutils import log_function
+
+from twisted.internet import reactor, defer
+from twisted.python import log
+
+import argparse
+import json
+import logging
+import os
+import re
+
+import cursesio
+import curses.wrapper
+
+
+logger = logging.getLogger("example")
+
+
+def excpetion_errback(failure):
+    logging.exception(failure)
+
+
+class InputOutput(object):
+    """ This is responsible for basic I/O so that a user can interact with
+    the example app.
+    """
+
+    def __init__(self, screen, user):
+        self.screen = screen
+        self.user = user
+
+    def set_home_server(self, server):
+        self.server = server
+
+    def on_line(self, line):
+        """ This is where we process commands.
+        """
+
+        try:
+            m = re.match("^join (\S+)$", line)
+            if m:
+                # The `sender` wants to join a room.
+                room_name, = m.groups()
+                self.print_line("%s joining %s" % (self.user, room_name))
+                self.server.join_room(room_name, self.user, self.user)
+                #self.print_line("OK.")
+                return
+
+            m = re.match("^invite (\S+) (\S+)$", line)
+            if m:
+                # `sender` wants to invite someone to a room
+                room_name, invitee = m.groups()
+                self.print_line("%s invited to %s" % (invitee, room_name))
+                self.server.invite_to_room(room_name, self.user, invitee)
+                #self.print_line("OK.")
+                return
+
+            m = re.match("^send (\S+) (.*)$", line)
+            if m:
+                # `sender` wants to message a room
+                room_name, body = m.groups()
+                self.print_line("%s send to %s" % (self.user, room_name))
+                self.server.send_message(room_name, self.user, body)
+                #self.print_line("OK.")
+                return
+
+            m = re.match("^paginate (\S+)$", line)
+            if m:
+                # we want to paginate a room
+                room_name, = m.groups()
+                self.print_line("paginate %s" % room_name)
+                self.server.paginate(room_name)
+                return
+
+            self.print_line("Unrecognized command")
+
+        except Exception as e:
+            logger.exception(e)
+
+    def print_line(self, text):
+        self.screen.print_line(text)
+
+    def print_log(self, text):
+        self.screen.print_log(text)
+
+
+class IOLoggerHandler(logging.Handler):
+
+    def __init__(self, io):
+        logging.Handler.__init__(self)
+        self.io = io
+
+    def emit(self, record):
+        if record.levelno < logging.WARN:
+            return
+
+        msg = self.format(record)
+        self.io.print_log(msg)
+
+
+class Room(object):
+    """ Used to store (in memory) the current membership state of a room, and
+    which home servers we should send PDUs associated with the room to.
+    """
+    def __init__(self, room_name):
+        self.room_name = room_name
+        self.invited = set()
+        self.participants = set()
+        self.servers = set()
+
+        self.oldest_server = None
+
+        self.have_got_metadata = False
+
+    def add_participant(self, participant):
+        """ Someone has joined the room
+        """
+        self.participants.add(participant)
+        self.invited.discard(participant)
+
+        server = origin_from_ucid(participant)
+        self.servers.add(server)
+
+        if not self.oldest_server:
+            self.oldest_server = server
+
+    def add_invited(self, invitee):
+        """ Someone has been invited to the room
+        """
+        self.invited.add(invitee)
+        self.servers.add(origin_from_ucid(invitee))
+
+
+class HomeServer(ReplicationHandler):
+    """ A very basic home server implentation that allows people to join a
+    room and then invite other people.
+    """
+    def __init__(self, server_name, replication_layer, output):
+        self.server_name = server_name
+        self.replication_layer = replication_layer
+        self.replication_layer.set_handler(self)
+
+        self.joined_rooms = {}
+
+        self.output = output
+
+    def on_receive_pdu(self, pdu):
+        """ We just received a PDU
+        """
+        pdu_type = pdu.pdu_type
+
+        if pdu_type == "sy.room.message":
+            self._on_message(pdu)
+        elif pdu_type == "sy.room.member" and "membership" in pdu.content:
+            if pdu.content["membership"] == "join":
+                self._on_join(pdu.context, pdu.state_key)
+            elif pdu.content["membership"] == "invite":
+                self._on_invite(pdu.origin, pdu.context, pdu.state_key)
+        else:
+            self.output.print_line("#%s (unrec) %s = %s" %
+                (pdu.context, pdu.pdu_type, json.dumps(pdu.content))
+            )
+
+    #def on_state_change(self, pdu):
+        ##self.output.print_line("#%s (state) %s *** %s" %
+                ##(pdu.context, pdu.state_key, pdu.pdu_type)
+            ##)
+
+        #if "joinee" in pdu.content:
+            #self._on_join(pdu.context, pdu.content["joinee"])
+        #elif "invitee" in pdu.content:
+            #self._on_invite(pdu.origin, pdu.context, pdu.content["invitee"])
+
+    def _on_message(self, pdu):
+        """ We received a message
+        """
+        self.output.print_line("#%s %s %s" %
+                (pdu.context, pdu.content["sender"], pdu.content["body"])
+            )
+
+    def _on_join(self, context, joinee):
+        """ Someone has joined a room, either a remote user or a local user
+        """
+        room = self._get_or_create_room(context)
+        room.add_participant(joinee)
+
+        self.output.print_line("#%s %s %s" %
+                (context, joinee, "*** JOINED")
+            )
+
+    def _on_invite(self, origin, context, invitee):
+        """ Someone has been invited
+        """
+        room = self._get_or_create_room(context)
+        room.add_invited(invitee)
+
+        self.output.print_line("#%s %s %s" %
+                (context, invitee, "*** INVITED")
+            )
+
+        if not room.have_got_metadata and origin is not self.server_name:
+            logger.debug("Get room state")
+            self.replication_layer.get_state_for_context(origin, context)
+            room.have_got_metadata = True
+
+    @defer.inlineCallbacks
+    def send_message(self, room_name, sender, body):
+        """ Send a message to a room!
+        """
+        destinations = yield self.get_servers_for_context(room_name)
+
+        try:
+            yield self.replication_layer.send_pdu(
+                Pdu.create_new(
+                    context=room_name,
+                    pdu_type="sy.room.message",
+                    content={"sender": sender, "body": body},
+                    origin=self.server_name,
+                    destinations=destinations,
+                )
+            )
+        except Exception as e:
+            logger.exception(e)
+
+    @defer.inlineCallbacks
+    def join_room(self, room_name, sender, joinee):
+        """ Join a room!
+        """
+        self._on_join(room_name, joinee)
+
+        destinations = yield self.get_servers_for_context(room_name)
+
+        try:
+            pdu = Pdu.create_new(
+                    context=room_name,
+                    pdu_type="sy.room.member",
+                    is_state=True,
+                    state_key=joinee,
+                    content={"membership": "join"},
+                    origin=self.server_name,
+                    destinations=destinations,
+                )
+            yield self.replication_layer.send_pdu(pdu)
+        except Exception as e:
+            logger.exception(e)
+
+    @defer.inlineCallbacks
+    def invite_to_room(self, room_name, sender, invitee):
+        """ Invite someone to a room!
+        """
+        self._on_invite(self.server_name, room_name, invitee)
+
+        destinations = yield self.get_servers_for_context(room_name)
+
+        try:
+            yield self.replication_layer.send_pdu(
+                Pdu.create_new(
+                    context=room_name,
+                    is_state=True,
+                    pdu_type="sy.room.member",
+                    state_key=invitee,
+                    content={"membership": "invite"},
+                    origin=self.server_name,
+                    destinations=destinations,
+                )
+            )
+        except Exception as e:
+            logger.exception(e)
+
+    def paginate(self, room_name, limit=5):
+        room = self.joined_rooms.get(room_name)
+
+        if not room:
+            return
+
+        dest = room.oldest_server
+
+        return self.replication_layer.paginate(dest, room_name, limit)
+
+    def _get_room_remote_servers(self, room_name):
+        return [i for i in self.joined_rooms.setdefault(room_name,).servers]
+
+    def _get_or_create_room(self, room_name):
+        return self.joined_rooms.setdefault(room_name, Room(room_name))
+
+    def get_servers_for_context(self, context):
+        return defer.succeed(
+                self.joined_rooms.setdefault(context, Room(context)).servers
+            )
+
+
+def main(stdscr):
+    parser = argparse.ArgumentParser()
+    parser.add_argument('user', type=str)
+    parser.add_argument('-v', '--verbose', action='count')
+    args = parser.parse_args()
+
+    user = args.user
+    server_name = origin_from_ucid(user)
+
+    ## Set up logging ##
+
+    root_logger = logging.getLogger()
+
+    formatter = logging.Formatter('%(asctime)s - %(name)s - %(lineno)d - '
+            '%(levelname)s - %(message)s')
+    if not os.path.exists("logs"):
+        os.makedirs("logs")
+    fh = logging.FileHandler("logs/%s" % user)
+    fh.setFormatter(formatter)
+
+    root_logger.addHandler(fh)
+    root_logger.setLevel(logging.DEBUG)
+
+    # Hack: The only way to get it to stop logging to sys.stderr :(
+    log.theLogPublisher.observers = []
+    observer = log.PythonLoggingObserver()
+    observer.start()
+
+    ## Set up synapse server
+
+    curses_stdio = cursesio.CursesStdIO(stdscr)
+    input_output = InputOutput(curses_stdio, user)
+
+    curses_stdio.set_callback(input_output)
+
+    app_hs = SynapseHomeServer(server_name, db_name="dbs/%s" % user)
+    replication = app_hs.get_replication_layer()
+
+    hs = HomeServer(server_name, replication, curses_stdio)
+
+    input_output.set_home_server(hs)
+
+    ## Add input_output logger
+    io_logger = IOLoggerHandler(input_output)
+    io_logger.setFormatter(formatter)
+    root_logger.addHandler(io_logger)
+
+    ## Start! ##
+
+    try:
+        port = int(server_name.split(":")[1])
+    except:
+        port = 12345
+
+    app_hs.get_http_server().start_listening(port)
+
+    reactor.addReader(curses_stdio)
+
+    reactor.run()
+
+
+if __name__ == "__main__":
+    curses.wrapper(main)