Mailman 3 July 2008 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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[Twisted-Python] regarding xml elements
by Raj kumar Oct. 2, 2013

Oct. 2, 2013

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml … [View More]

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool April 28, 2013

April 28, 2013

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def … [View More]

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[Twisted-Python] SQLAlchemy and Twisted
by alex clemesha Feb. 13, 2009

Feb. 13, 2009

Hi, I didn't want to hijack the 'Twisted Presentation Materials..' thread, so I started this one ... First off, in the other thread, Glenn, you mentioned Storm. I have heard of Storm, but never got any deeper that noticing that it is still a work in progress (maybe things have settled down ?) If anyone has anything to say on how it might be a good choice with Twisted, please feel free to enlighten us! But, I hoping to solve some immediate problems with Twisted and SQLAlchemy, so ... >… [View More]

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[Twisted-Python] Modifying Conch example
by Pump Kin Aug. 1, 2008

Aug. 1, 2008

Hello! I'm trying to implement the example in the Conch tutorial ( http://twistedmatrix.com/projects/conch/documentation/howto/conch_client.ht…). with some modifications. I want to do the following: 1) Connect to a remote machine using a private key (no password) without knowing the public key 2) Transfer over some files 3) Issue a series of non-interactive commands (to fire up the scripts I transferred over) 4) Close the connection Step 2) I can easily do with a single non-interactive … [View More]

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[Twisted-Python] Please recommend a RPC system working with twisted.
by Peter Cai July 29, 2008

July 29, 2008

Hi all, I'm looking for an RPC system working with twisted. 1. Binary. I want it run faster than any xml based RPC. 2. Bidirectional. Unlike HTTP, on which the client has to poll the sever for events, the server should "call" the client's method to notify events. 3. C/Python support. Part of the system shall be written in C. 4. Could easily integrated with twisted. Unfortunately, there seems no such resolution existed. So maybe I have to give up some requirements.

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[Twisted-Python] Possible bug on twisted.conch.ssh.keys?
by Adriano Marques July 29, 2008

July 29, 2008

Hello folks, I'm facing a problem here while trying to implement a ssh server and client using twisted. There are some deprecated functions that are pointing me to use new ones, which in turn doesn't seem to work fine. I'm not sure if it is the case, mainly because the deprecated functions are calling the new ones, but while debuging the code I found that something there is wrong, and that can potentially be hapenning because of the changes recently made to that module. As I'm somehow new to … [View More]twisted I'm not sure about my statements arround the problem. Here follows the codes and exceptions I'm getting: <client_code> #!/usr/bin/env python # This code was based on an example from twisted website from twisted.conch.ssh import transport, userauth, connection from twisted.conch.ssh import common, keys, channel from twisted.internet import defer, protocol, reactor from twisted.python import log import struct, sys, getpass, os USER = 'ssh' HOST = 'localhost' PORT = 2222 PUBKEY = "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQD3n4sYqbdnlVyvy2SRUmQ5HJg2NDHyC0m4FIykDygXW2PTcSHU/Jany95D54qAEkUra0KHk94KvyGhNVYXqPmzPLu4onlr0Y/gQzEsIy15jDGjMWVCX/8+PQJxMYObSKs8U1o/h5fDNeKQs4bZbrm+35eT/Kvyerqa6ab5OsIEnQ==" PRIVKEY = """-----BEGIN RSA PRIVATE KEY----- MIICXAIBAAKBgQD3n4sYqbdnlVyvy2SRUmQ5HJg2NDHyC0m4FIykDygXW2PTcSHU /Jany95D54qAEkUra0KHk94KvyGhNVYXqPmzPLu4onlr0Y/gQzEsIy15jDGjMWVC X/8+PQJxMYObSKs8U1o/h5fDNeKQs4bZbrm+35eT/Kvyerqa6ab5OsIEnQIDAQAB AoGAK2MWASVDkG+4RMkTfu77xpH/DYhJtApMSWe4WMqbELSfoh2xetsjHpV3BVjd iKEq43ewuYasIh/pKZDp281sqqXdg9VI9ZW7kB00FhO2wA4emCIVj6CHMl1K9NrU 9Spy40garaYnDdud79SnKtxlKQEALOwCpTEcrjGOLBTbirUCQQD/FkP1zhpOSaOy B32CiC13W5fFfREzBxzQ3Med1i1OYtFfBEdJqv/Z7APadNN8ySI3r+UAfGatTzJI zbiSZ2fHAkEA+IJwWpw6d8R3t7+8UgTrqdsZhLRdidO0cHcIFcnU/QYZg+iw3F+q Tuz/mngpfb5214r8zwcwlNzsC4+fyOOYewJBAMPstRw6Rog1FW8rQ6Kbt9hCWItO aYR5BRADU6sOk1PuoIPLhHm3xrX6CmejbcEdt5NwHYNHCZI6DxRONmL024cCQBky eJvnXVJJfG4IJdsXHqIBUiwPcbCI47HHj+1NoqfpF2s1i8E8ffM0upH5/xL93eTq 9ck0DGv7nn9pl6Tx1sMCQCWZbWDnmEdsSoNUQZ8fyQEDoZ/2gUP+R2/WpLikwmSA 41n7cUONVthIYOZw0qQPP//PyPtMVxcYT76D5QACEK8= -----END RSA PRIVATE KEY-----""" class ClientTransport(transport.SSHClientTransport): def connectionMade(self): transport.SSHClientTransport.connectionMade(self) def verifyHostKey(self, hostKey, fingerprint): return defer.succeed(1) def connectionSecure(self): self.requestService(ClientUserAuth(USER, ClientConnection())) class ClientUserAuth(userauth.SSHUserAuthClient): def getPublicKey(self): # Issue 1 return PUBKEY.encode("ascii") def getPrivateKey(self): # Issue 2 return defer.succeed(keys.getPrivateKeyObject(data=PRIVKEY)) def getPassword(self): return defer.succeed(getpass.getpass("%s@%s's password: " % (USER, HOST))) def getGenericAnswers(self, name, instruction, questions): import pdb; pdb.set_trace() log.debug("Get Generic answers: %s, %s, %s" % (name, instruction, questions)) answers = [] for prompt, echo in questions: if echo: answer = raw_input(prompt) else: answer = getpass.getpass(prompt) answers.append(answer) return defer.succeed(answers) def tryAuth(self, kind): kind = "publickey" log.debug("tryAuth: %s" % kind) log.debug("Public Key: %s" % self.getPublicKey()) return userauth.SSHUserAuthClient.tryAuth(self, kind) def signData(self, publicKey, signData): log.debug("Ran signData with %s and %s" % (publicKey, signData)) import pdb; pdb.set_trace() signed = userauth.SSHUserAuthClient.signData(self, publicKey, signData) return signed def auth_publickey(self): log.debug("Trying Auth Method: Public Key") return userauth.SSHUserAuthClient.auth_publickey(self) class ClientConnection(connection.SSHConnection): def serviceStarted(self): log.debug("Service started") self.openChannel(TrueChannel(2**16, 2**15, self)) self.openChannel(FalseChannel(2**16, 2**15, self)) self.openChannel(CatChannel(2**16, 2**15, self)) class TrueChannel(channel.SSHChannel): name = 'session' def openFailed(self, reason): print 'true failed', reason def channelOpen(self, ignoredData): self.conn.sendRequest(self, 'exec', common.NS('true')) def request_exit_status(self, data): status = struct.unpack('>L', data)[0] print 'true status was: %s' % status self.loseConnection() class FalseChannel(channel.SSHChannel): name = 'session' def openFailed(self, reason): print 'false failed', reason def channelOpen(self, ignoredData): self.conn.sendRequest(self, 'exec', common.NS('false')) def request_exit_status(self, data): status = struct.unpack('>L', data)[0] print 'false status was: %s' % status self.loseConnection() class CatChannel(channel.SSHChannel): name = 'session' def openFailed(self, reason): print 'echo failed', reason def channelOpen(self, ignoredData): self.data = '' d = self.conn.sendRequest(self, 'exec', common.NS('cat'), wantReply = 1) d.addCallback(self._cbRequest) def _cbRequest(self, ignored): self.write('hello conch\n') self.conn.sendEOF(self) def dataReceived(self, data): self.data += data def closed(self): print 'got data from cat: %s' % repr(self.data) self.loseConnection() reactor.stop() protocol.ClientCreator(reactor, ClientTransport).connectTCP(HOST, 2222) reactor.run() </client_code> The issues: 1 - I had to encode the public key to ascii prior to using it. I don't know why, but the struct was raising an exception telling that one of the chars where out of the ascii range. But it doesn't look to have any character outside the ascii range, AFAIK. Anyway, it worked when I did the conversion to ascii. 2 - When I use: keys.Key.fromString(data=PRIVKEY) instead of the deprecated keys.getPrivateKeyObject(data=PRIVKEY), I get this error while trying to authenticate: <error> # This was caught directly from pdb prompt: > connectSSH.py(77)signData() -> signed = userauth.SSHUserAuthClient.signData(self, publicKey, signData) (Pdb) n > site-packages/twisted/conch/ssh/userauth.py:374: DeprecationWarning: signData is deprecated since Twisted Conch 0.9. Use Key(obj).sign(data). return keys.signData(privateKey, signData) > connectSSH.py(79)signData() -> return signed (Pdb) p signed <Deferred at 0x12a1760 current result: <twisted.python.failure.Failure <type 'exceptions.RuntimeError'>>> (Pdb) p signed.result <twisted.python.failure.Failure <type 'exceptions.RuntimeError'>> (Pdb) p signed.result.getErrorMessage() 'unknown type of object: <RSA Private Key (1023 bits)\nattr e:\n\t01:00:01\nattr d:\n\t2b:63:16:01:25:43:90:6f:b8:44:c9:13:7e:ee:fb:\n\tc6:91:ff:0d:88:49:b4:0a:4c:49:67:b8:58:ca:9b:\n\t10:b4:9f:a2:1d:b1:7a:db:23:1e:95:77:05:58:dd:\n\t88:a1:2a:e3:77:b0:b9:86:ac:22:1f:e9:29:90:e9:\n\tdb:cd:6c:aa:a5:dd:83:d5:48:f5:95:bb:90:1d:34:\n\t16:13:b6:c0:0e:1e:98:22:15:8f:a0:87:32:5d:4a:\n\tf4:da:d4:f5:2a:72:e3:48:1a:ad:a6:27:0d:db:9d:\n\tef:d4:a7:2a:dc:65:29:01:00:2c:ec:02:a5:31:1c:\n\tae:31:8e:2c:14:db:8a:b5\nattr n:\n\t00:f7:9f:8b:18:a9:b7:67:95:5c:af:cb:64:91:52:\n\t64:39:1c:98:36:34:31:f2:0b:49:b8:14:8c:a4:0f:\n\t28:17:5b:63:d3:71:21:d4:fc:96:a7:cb:de:43:e7:\n\t8a:80:12:45:2b:6b:42:87:93:de:0a:bf:21:a1:35:\n\t56:17:a8:f9:b3:3c:bb:b8:a2:79:6b:d1:8f:e0:43:\n\t31:2c:23:2d:79:8c:31:a3:31:65:42:5f:ff:3e:3d:\n\t02:71:31:83:9b:48:ab:3c:53:5a:3f:87:97:c3:35:\n\te2:90:b3:86:d9:6e:b9:be:df:97:93:fc:ab:f2:7a:\n\tba:9a:e9:a6:f9:3a:c2:04:9d\nattr q:\n\t00:ff:16:43:f5:ce:1a:4e:49:a3:b2:07:7d:82:88:\n\t2d:77:5b:97:c5:7d:11:33:07:1c:d0:dc:c7:9d:d6:\n\t2d:4e:62:d1:5f:04:47:49:aa:ff:d9:ec:03:da:74:\n\td3:7c:c9:22:37:af:e5:00:7c:66:ad:4f:32:48:cd:\n\tb8:92:67:67:c7\nattr p:\n\t00:f8:82:70:5a:9c:3a:77:c4:77:b7:bf:bc:52:04:\n\teb:a9:db:19:84:b4:5d:89:d3:b4:70:77:08:15:c9:\n\td4:fd:06:19:83:e8:b0:dc:5f:aa:4e:ec:ff:9a:78:\n\t29:7d:be:76:d7:8a:fc:cf:07:30:94:dc:ec:0b:8f:\n\t9f:c8:e3:98:7b\nattr u:\n\t25:99:6d:60:e7:98:47:6c:4a:83:54:41:9f:1f:c9:\n\t01:03:a1:9f:f6:81:43:fe:47:6f:d6:a4:b8:a4:c2:\n\t64:80:e3:59:fb:71:43:8d:56:d8:48:60:e6:70:d2:\n\ta4:0f:3f:ff:cf:c8:fb:4c:57:17:18:4f:be:83:e5:\n\t00:02:10:af>' </error> This is the function that raised that exception: http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.1.0/twisted/c… It looks like the problem is that the class name doesn't start with Crypto.PublicKey. Then, when I use the deprecated method, this is what I have: <not_an_error> > connectSSH.py(77)signData() -> signed = userauth.SSHUserAuthClient.signData(self, publicKey, signData) (Pdb) n tests/connectSSH.py:48: DeprecationWarning: getPrivateKeyObject is deprecated since Twisted Conch 0.9. Use Key.fromString(). return defer.succeed(keys.getPrivateKeyObject(data=PRIVKEY)) site-packages/twisted/conch/ssh/userauth.py:374: DeprecationWarning: signData is deprecated since Twisted Conch 0.9. Use Key(obj).sign(data). return keys.signData(privateKey, signData) > connectSSH.py(79)signData() -> return signed (Pdb) p signed <Deferred at 0x12a1760 current result: '\x00\x00\x00\x07ssh-rsa\x00\x00\x00\x80\xa9w-\x0c\x9e\xc3\xe8\xd0\xff\xb8\xf0\xbbi*\xecJ\x8e5\xac\x0e(@\x18\x81\x11\xf4\xff\xda\xde\xd6\x9b\xbe\xef\\\xc2\xd0F8Q\x15\xd0A\xa1!$\xe2\xe5\xa0\xf8\x12O\xa0*4\xe1)\xc2:\xbf\x16\x0b\x8a\xd2J\xa8D\x01\xdd\x10\xe3\xeb\x8b*9,\xf3#b\xff\xbf\xc9\xe9\xdc\x81\xa4B\x88$\r\x8b\xef|y\x80\r\x08\x8a*\x08x:\x0c{\xcf\x97\xb7"\xe19\x1f\xa2_wV4\xfa\x19"Vf\xcf\x80\xa7i\x98\xfa\xefM'> </not_an_error> After moving to the deprecated method, everything seems to work ok with the client, but then I started to have a similar problem at the server side, while verifying client's signature. Here is the relevant part of the server code, which is the method requestAvatarId of the Credential Checker I implemented: <server_code> # This code is based in an example that I caught from twisted website class PublicKeyChecker(): implements(checkers.ICredentialsChecker) credentialInterfaces = (credentials.ISSHPrivateKey, ) def requestAvatarId(self, credentials): # I removed here the code that verified if the user is registered in our database, to easy for you guys to understand the relevant part of the code. Just consider that the variable user contains the found user object. user_key = user.key.public_key if not credentials.blob == user_key: raise failure.Failure(error.ConchError("Wrong key.")) if not credentials.signature: return failure.Failure(error.ValidPublicKey()) pub_key = Key.fromString(data=credentials.blob) # Issue 3 if verifySignature(pub_key, credentials.signature, credentials.sigData): return credentials.username else: return failure.Failure(error.ConchError("Incorrect Signature.")) else: return failure.Failure(error.ConchError("Authentication Failed.")) </server_code> 3 - Then, while I get to the verifySignature method, I get the following error: <error> RuntimeError: unknown type of object: <RSA Public Key (1023 bits) attr e: 01:00:01 attr n: 00:f7:9f:8b:18:a9:b7:67:95:5c:af:cb:64:91:52: 64:39:1c:98:36:34:31:f2:0b:49:b8:14:8c:a4:0f: 28:17:5b:63:d3:71:21:d4:fc:96:a7:cb:de:43:e7: 8a:80:12:45:2b:6b:42:87:93:de:0a:bf:21:a1:35: 56:17:a8:f9:b3:3c:bb:b8:a2:79:6b:d1:8f:e0:43: 31:2c:23:2d:79:8c:31:a3:31:65:42:5f:ff:3e:3d:... </error> Which is the same exception raised by the key.type() function that have put us at the same trouble in the client. Then, at the debuger, I found that the correct key (which is a class with name starting with Crypto.PublicKey) is right inside this "unknown" object, which is a RSA Public Key in object.keyObject.keyObject! I ran the WingIDE debugger and simply saw that, as you can see in this screenshot: http://www.imageno.com/z99azx3v7qnzpic.html Ok, I also get the deprecated warning while using the verifySignature method instead of Key(obj).verify(sig, data), then I decided to test it also just to don't make you guys wast your time with me for nothing. I called pub_key.verify(credentials.signature, credentials.sigData) instead of that verifySignature call, and it returned False instead leading to a failure in authentication. Both apps (client and server) are running inside the same machine, consulting the same database, the same keys and user, so there it is not reasonable to be failing if my code is correct. Maybe I missed something. Can you guys help me? Sorry about the very long email, but I tried to be as much verbose as I could in order to help you guys help me. Kind Regards, -- Adriano Monteiro Marques http://adriano-marques.blogspot.com http://umit.sourceforge.net py.adriano(a)gmail.com "Don't stay in bed, unless you can make money in bed." - George Burns [View Less]

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[Twisted-Python] C or Objective-C AMP?
by Nathan July 28, 2008

July 28, 2008

1) Does anyone know if AMP has been implemented in either C or Objective-C yet? 2) Is there a better way for me to find that out than asking on this list? (Is there somewhere I should be looking first?) ~ Nathan

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[Twisted-Python] Running a HTTP client connection through a SOCKS proxy
by nnp July 27, 2008

July 27, 2008

Hey, I'm working on an app at the moment, part of which needs to grab a page from a website and parse the results. It will have to work in environments where connections have to be routed through a SOCKSv4 proxy but I can't find any way to specify a proxy using any of the Twisted classes. Is this possible? I assumed it was seeing as how it is a fairly common situation but the documentation/API haven't provided any useful information. Cheers, nnp Btw, my code currently looks like this : from … [View More]

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[Twisted-Python] Writing new transports / a tunnel Protocol
by Michael Carter July 27, 2008

July 27, 2008

Hello, I'm hoping to use existing protocol implementations in twisted, but over a custom tunneling protocol that I'll call CTP for the remainder of this thread. CTP is basically TCP with a couple of strange characteristics. Besides a custom handshake, two actual tcp connections are used for the data transport, each of which is considered uni-directional; one connection is used for "upstream" and one for "downstream". I know how to create a twisted factory / protocol implementation for CTP … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com July 27, 2008

July 27, 2008

1 0

[Twisted-Python] trial and adbapi.ConnectionPool
by Tim Allen July 26, 2008

July 26, 2008

In the projects I'm working on at the moment, we're using t.e.adbapi.ConnectionPool wrapping psycopg2 to handle connections to a PostgreSQL database. The setUp method of our unit-tests drops and recreates the database each time, and we've discovered that intermittently tests will fail because a previous test is still connected to the database when the subsequent test runs. Annoyingly, it happens on some machines and not others. I've attached a unit-test that reliably reproduces the problem for … [View More]

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[Twisted-Python] From prototype to production
by nadine July 25, 2008

July 25, 2008

Hi, Many thanks to the creators and developers of Twisted. I have been using Twisted to develop a prototype (using an Dell desktop) for an inline DPI server. Needless to say, Twisted made the development time much shorter, and I am very grateful for that. I now want to migrate from prototype to production. I was fully expecting to use an intel IXP server, and having to learn its OS and low-level programming languages. But intel itself told me that they are discontinuing that family, and … [View More]

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[Twisted-Python] Twisted + Pyglet = txpyglet?
by Nathan July 25, 2008

July 25, 2008

When I got asked the third (fourth?) time to show how I "integrated" pyglet and twisted together, I decided to package it up and put it out there. I called it txpyglet because of all the tx-prefix-discussion-stuff, but it's really more of a sample app than a twisted library. A short screencast demo and a link to a zipfile of the goods can be found here: http://nathanstocks.blogspot.com/2008/07/txpyglet.html For the actual "integration" method, just look at the last 50-ish lines of the … [View More]

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[Twisted-python] help about create a tcp connection pool using twisted
by 陳毅泰 July 24, 2008

July 24, 2008

Hi, if I want to make a tcp connection pool by twisted, how can I do that?? I am confuse about what should I keep?? The procotol instance or something else, thanks a lot...

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[Twisted-Python] ANNOUNCING Allmydata.org "Tahoe", the Least-Authority Filesystem, v1.2
by zooko July 24, 2008

July 24, 2008

Dear twisted-python(a)twistedmatrix.com: This open source storage system is built on top of Twisted. Twisted is great! Regards, Zooko We are pleased to announce the release of version 1.2.0 of the "Tahoe" Least Authority Filesystem. The "Tahoe" Least Authority Filesystem is a secure, decentralized, fault-tolerant filesystem. All of the source code is available under a Free Software, Open Source licence (or two). This filesystem is encrypted and distributed over multiple peers in such … [View More]a way it continues to function even when some of the peers are unavailable, malfunctioning, or malicious. A one-page explanation of the security and fault-tolerance properties that it offers is visible at: http://allmydata.org/source/tahoe/trunk/docs/about.html This is the successor to Allmydata.org "Tahoe" Least Authority Filesystem v1.1, which was released June 11, 2008 [1]. This release fixes a security issue in Tahoe v1.1, fixes a few small issues in the web interface, adds a "check health" operation for mutable files, and adds logging/operations/deployment improvements. See the known_issues.txt file [2] and the NEWS file [3] for details. COMPATIBILITY The version 1 branch of Tahoe is used as the basis of the consumer backup product from Allmydata, Inc. -- http://allmydata.com . Tahoe v1.2 is fully compatible with Tahoe v1.0. v1.2 clients produce files which can be read by v1.0 clients. v1.2 clients can read files produced by clients of all versions >= v0.8. v1.2 servers can serve v1.0 clients and v1.2 clients can use v1.0 servers. This is the third release in the version 1 series. We believe that this version of Tahoe is stable enough to rely on as a permanent store of valuable data. The version 1 branch of Tahoe will be actively supported and maintained for the forseeable future, and future versions of Tahoe will retain the ability to read files and directories produced by Tahoe v1 for the forseeable future. WHAT IS IT GOOD FOR? With Tahoe, you can distribute your filesystem across a set of computers, such that if some of the computers fail or turn out to be malicious, the filesystem continues to work from the remaining computers. You can also share your files with other users, using a cryptographic capability-based access control scheme. Because this software is the product of less than two years of active development, we do not categorically recommend it for the storage of data which is extremely confidential or precious. However, we believe that the combination of erasure coding, strong encryption, and careful engineering make Tahoe safer than common alternatives, such as RAID, or traditional backup onto a remote server, removable drive, or tape. This software comes with extensive unit tests [4], and there are no known security flaws which would compromise confidentiality or data integrity. (For all currently known issues please see the known_issues.txt file [2].) This release of Tahoe is suitable for the "friendnet" use case [5] -- it is easy to create a filesystem spread over the computers of you and your friends so that you can share disk space and share files. LICENCE You may use this package under the GNU General Public License, version 2 or, at your option, any later version. See the file "COPYING.GPL" [6] for the terms of the GNU General Public License, version 2. You may use this package under the Transitive Grace Period Public Licence, version 1.0. The Transitive Grace Period Public Licence says that you may distribute proprietary derived works of Tahoe without releasing the source code of that derived work for up to twelve months, after which time you are obligated to release the source code of the derived work under the Transitive Grace Period Public Licence. See the file "COPYING.TGPPL.html" [7] for the terms of the Transitive Grace Period Public Licence, version 1.0. (You may choose to use this package under the terms of either licence, at your option.) INSTALLATION Tahoe works on Linux, Mac OS X, Windows, Cygwin, and Solaris. For installation instructions please see "docs/install.html" [8]. HACKING AND COMMUNITY Please join us on the mailing list [9] to discuss uses of Tahoe. Patches that extend and improve Tahoe are gratefully accepted -- the RoadMap page [10] shows the next improvements that we plan to make and CREDITS [11] lists the names of people who've contributed to the project. The wiki Dev page [12] contains resources for hackers. SPONSORSHIP Tahoe is sponsored by Allmydata, Inc. [13], a provider of commercial backup services. Allmydata, Inc. contributes hardware, software, ideas, bug reports, suggestions, demands, and money (employing several allmydata.org Tahoe hackers and instructing them to spend part of their work time on this free-software project). Also they distribute customized t-shirts just for some of our favorite contributors. We are eternally grateful! Zooko O'Whielacronx on behalf of the allmydata.org team July 21, 2008 Boulder, Colorado, USA [1] http://allmydata.org/trac/tahoe/browser/relnotes.txt?rev=2716 [2] http://allmydata.org/trac/tahoe/browser/docs/known_issues.txt [3] http://allmydata.org/trac/tahoe/browser/NEWS [4] http://allmydata.org/trac/tahoe/wiki/Dev [5] http://allmydata.org/trac/tahoe/wiki/UseCases [6] http://allmydata.org/trac/tahoe/browser/COPYING.GPL [7] http://allmydata.org/source/tahoe/trunk/COPYING.TGPPL.html [8] http://allmydata.org/source/tahoe/trunk/docs/install.html [9] http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev [10] http://allmydata.org/trac/tahoe/roadmap [11] http://allmydata.org/trac/tahoe/browser/CREDITS?rev=2677 [12] http://allmydata.org/trac/tahoe/wiki/Dev [13] http://allmydata.com [View Less]

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[Twisted-Python] Waiting on a Deferred
by Saketh July 23, 2008

July 23, 2008

Hello everyone, Is it possible to call asynchronous methods synchronously? I'm asking because I have an xmlrpc.XMLRPC server which distributes a calculation across several remote servers, collects the results in a DeferredList, and wraps it all inside an xmlrpc_something method. Thus, it needs to return the result to a web browser synchronously. [Interface] -- [XMLRPC server] -- [Calculators] This seems like it would be a common thing, getting the result of a distributed calculation for a … [View More]

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[Twisted-Python] Converting async to sync code (blocking until deferreds fire)
by Jack Whitham July 22, 2008

July 22, 2008

Hi, What is the best way to convert asynchronous code (non-blocking, returning deferreds) to synchronous code (blocking)? I have a client that is written using Twisted. Most of the methods within the client object return Deferreds because they send messages to a server and replies may take some time. This is ideal for the wxwidgets GUI that was originally intended to use the client. But now I want to write test scripts for the server that are synchronous. For example, the client provides … [View More]

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[Twisted-Python] txAMQP released
by Esteve Fernandez July 21, 2008

July 21, 2008

Hi all, I'm pleased to announce that Fluidinfo [1] is releasing a Twisted compatible AMQP stack built on the Python Qpid library. Download from http://foss.fluidinfo.com We've been using it for a while at Fluidinfo and have converted all the Qpid tests to use it, so it should be considered fairly stable. Although we'll try to keep it in sync with Qpid's stable releases, we can't promise to track the trunk due to lack of resources. Feedback and contributions will be greatly appreciated! :-)… [View More]

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[Twisted-Python] James Brake has invited you to join Friendster
by James Brake July 21, 2008

July 21, 2008

You're invited to join James Brake's network of friends. By joining Friendster, you can reconnect with old friends, meet new friends, start a blog, build a custom profile, keep track of birthdays, and so much more! You can even stay in touch if you move away, switch email addresses, or lose your mobile phone. Click below to join James's network. http://www.friendster.com/join.php?inviteref=72570452&invite=-8C6ksHVjn… ****************************************************************… [View More]

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[Twisted-Python] t.w.x.d.Element serialization and default namespaces
by Peter Sabaini July 20, 2008

July 20, 2008

Hi, I'm trying to get to grips with Xish; and theres this annoying little problem: through a series of steps I'm getting at an Element who doesn't use the default namespace anymore, only some other NS. I am trying to make this other NS the default NS for serialization, but without much luck. For example: >>> from twisted.words.xish import domish >>> e=domish.Element(("foons", "foo"), defaultUri="defuri", localPrefixes={"f":"foons"} ) >>> e.addElement(("foons", "… [View More]

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[Twisted-Python] check if user is in channel (twisted.words irc)
by Michael Otteneder July 20, 2008

July 20, 2008

Hi! I'm looking for a simple way to check whatever a use with a specific name is in a channel or not. How could I do this? Im connecting to irc by subclassign the twisted.words.im.ircsupport.IRCProto class. Thanks in advance!

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com July 20, 2008

July 20, 2008

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[Twisted-Python] txprotobuf
by Johan Euphrosine July 19, 2008

July 19, 2008

Hi, I'm working on a twisted implementation of protocol buffers RPC here: http://launchpad.net/txprotobuf/ http://bazaar.launchpad.net/~proppy/txprotobuf/master/changes Feel free to join :) Twisted: Twisted is an event-driven networking engine written in Python and licensed under the MIT license. http://twistedmatrix.com/trac/ Protocol Buffers: Protocol Buffers - Google's data interchange format http://code.google.com/p/protobuf/ -- bou ^

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Re: [Twisted-Python] Stackless Python Examples Revisited Re: InlineCallbacks
by Andrew Francis July 18, 2008

July 18, 2008

Hi Folks: >Message: 4 >Date: Sat, 19 Apr 2008 11:47:38 -0700 (PDT) >From: Andrew Francis <andrewfr_ice(a)yahoo.com> >Subject: [Twisted-Python] Stackless Python Examples Re: InlineCallback > Friendly ? >To: twisted-python(a)twistedmatrix.com >Message-ID: <882470.36243.qm(a)web34201.mail.mud.yahoo.com> >Content-Type: text/plain; charset=iso-8859-1 --- Andrew Francis <andrewfr_ice(a)yahoo.com> wrote: >Based on Jean-Paul's explanation, here are … [View More]some code >snippets showing how to handle other protocols with >Stackless Python and Twisted. This is a continuation >of the technique I used in "Adventures" to prevent the >reactor from deadlocking. >Currently I am rethinking the techniques - I believe >there is a way to reduce spawning tasklets - not that >tasklets are all that expensive.... I have been experimenting with a new technique for tasklets to interact with Twisted protocol instances (the following is essentially what I was pestering the Twisted Team about at PyCon 2008. Sorry guys) I have been exploring situations where a tasklet rendezvoused with Twisted (as opposed to a Twisted spawning a tasklet to fulfill a request). A lot of WS-BPEL constructs take this form.... In the old system, I ran the server protocol instance in its own tasklet. This was to prevent the reactor from blocking and preventing other tasklets from issuing Twisted calls. In turn, the tasklet and protocol instance/tasklet communicated via a channel. With this technique, I do not create an additional tasklet. Rather I pass back a deferred whose callback points to the reminder of the protocol instance's code. Although I have not finished testing, this technique seems to be about 20% faster. Again, implementing this is fairly straightforward. Here is a sketch. class MyRequestHandler(http.Request): def __httpWrite__(self, status, message): self.setResponseCode(status) self.write(message.encode("utf-8")) self.finish() return def process(self): """ create a deferred """ myDeferred = defer.Deferred() myDeferred.addCallback(self.processReply) """ we need a way for the protocol instance to tell tasklets that a connect has been made. Easiest way, just hand the protocol instance a reference """ status, message = \ MyRequestHandler.someReferenceToProgramme(self.path, \ self.content.read(), \ myDeferred) if status != http.OK: print "ERROR!" self.__httpWrite__(status, message) myDeferred = None """ if things went well, return a deferred This is a Twisted way to circumvent blocking and waiting for information """ return myDeferred """ the continuation """ def processReply(self, reply): self.__httpWrite__(200, reply[0]) return meanwhile, in the tasklet def tasklet(...): . . . deferred = someFunction(somePath) # send a message deferred.callback(message) Although PyCon 2008 is over, I still plan to submit a paper that will better explain the various techniques in the "Adventures" talk. I am also writing simpler code to better illustrate the techniques and combine them with other tried-and-true techniques (i.e., Armstrong's blockOn). Cheers, Andrew [View Less]

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