November 2017 - Pharo-users

nice CSS for the Pharo online HTML version?
by Stephane Ducasse Nov. 5, 2017

Nov. 5, 2017

Hi Iâm looking for a nice CSS for the Pharo online HTML version. I found something like that https://www.smashingmagazine.com/2015/02/designers-start-coding-with-uilang/ Stef -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr http://www.synectique.eu / http://www.pharo.org 03 59 35 87 52 Assistant: Julie Jonas FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

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Re: [Pharo-users] [Pharo-dev] [ANNOUNCE] ParrotTalk release/design change considerations
by henry Nov. 5, 2017

Nov. 5, 2017

I disabled vatId authorization in version 3, located in SessionOperations>>processIWant | SessionOperations>>processIAm:. I was asked to disseminate my news to Pharo Users, hello there. I was asked to describe ParrotTalk well, provide use cases and adopters of its use. Alright, I will give an attempt. ParrotTalk is an encrypted connection framework. Currently allowing anonymous 2048-bit key negotiation to establish user-provided encryption cipher and user-provided encoding and decoding, both through a provided SessionAgentMap to a starting SessionAgent server. Please look in the test case ThunkHelloWorldTest for building these maps and running a connection iwth data passing after encryption is established. There is a 4-way negotiation, from ProtocolOffered/Accepted to Go/GoToo. In using RSA 2048 signature validation and DH 2048 primes to establish the key used within the selected Cipher. The Cipher and Encoder are selected by name through the negotiation protocol. Currently three Ciphers are selectable, AESede, DESede, and DES. There are two encoders tested, asn1der, and Bytes. This protocol is described here, in this document. https://github.com/ZiroZimbarra/callistohouse/blob/master/docs/ParrotTalkFr… For as to use cases, this encrypted connection has no third party, man-in-the-middle situation by not using Certificates. As such, this is a tight implementation of NSA-proof encryption without explicit authorization beyond knowledge of a host:port. The use cases involve any communication desired to be encrypted with such high encryption. The support will last my lifetime, so we have a settled solution, here in the third version, provided here. It requires version 111 of Cryptography, as a prerequisite. Both run on Squeak and Pharo. http://www.squeaksource.com/Cryptography/Cryptography-zzz.111.mcz http://www.squeaksource.com/Cryptography/ParrotTalk-HenryHouse.3.mcz The current use is with my hubbub system, a promise-based distributed object implementation. I am working to bring ParrotTalk to Java and allow hubbub to operate interdependently between Squeak, Pharo, Java and any other languages which can support ParrotTalk and STON. My latest efforts with hubbub are to bring STON as the Layer 6 encoding. Hubbub depends on eLinda. http://www.squeaksource.com/Cryptography/elinda-HenryHouse.14.mcz http://www.squeaksource.com/Oceanside/hubbub-HenryHouse.38.mcz Hubbub currently fails to load correctly in Pharo. In Squeak the two ParrotRemoteTestCases: LookupTestCase and OperationalTestCase really screw everything up, do not save an image after running. I never run these tests until I get a better handle of serialization. Currently, do to a shift in progress to STON, the serialization tests fail, just the way we like it. Fix the tests then the system starts to work right. The shift away from vatId authorization should not adversely affect hubbub, we hope! When STON starts to work, and I think I need to turn off jsonMode, then traffic between vats can start to be analyzed and figure out how resolving is working with redirectors invoked remotely. - HH > -------- Original Message -------- > Subject: Re: [Pharo-dev] [ANNOUNCE] ParrotTalk release/design change considerations > Local Time: October 25, 2017 12:43 AM > UTC Time: October 25, 2017 4:43 AM > From: btc(a)openinworld.com > To: henry <henry(a)callistohouse.club>, Pharo Development List <pharo-dev(a)lists.pharo.org> > Stephane Ducasse <stepharo.self(a)gmail.com> > > If I google... parrottalk protocol > nothing seems related. So what is ParrotTalk? > > P.S... since this is not "part of" pharo, [pharo-users] would be a better place for discussion than [pharo-dev]. > Could you re-announce there, with some description of use cases and who/where the protocol is used? > > cheers -ben > > On Wed, Oct 25, 2017 at 1:42 AM, henry <henry(a)callistohouse.club> wrote: > >> Please excuse all the low-level detail, if inappropriate to the discussion. The protocol changes are here specified. >> >> - HH >> >> On Tue, Oct 24, 2017 at 13:40, henry <henry(a)callistohouse.club> wrote: >> >>> In order to bring ParrotTalk-3.6 support, alongside historical 3.5 support, the frame header stays the same and the processing of the ProtocolOffered would select "ParrotTalk-3.6" to use the compact protocol of >>> >>> - ProtocolOffered { offered, preferred } >>> - ProtocolAccepted { accepted } >>> - IWant|GiveInfo|ReplyInfo { vatId, domain, publicKey, cryptoProtocols, dataEncoders } >>> - IAm|ReplyInfo { vatId, domain, publicKey, cryptoProtocol, dataEncoder, dhParam } >>> - Go { cryptoProtocol, dataEncoder, dhParam, signature } >>> - GoToo { signature } >>> >>> Using eLinda : >>> >>> http://www.squeaksource.com/Cryptography/elinda-HenryHouse.14.mcz >>> >>> Above the FrameBuffer, below the SessionOperations for each version of the protocol, an ELindaSession could be inserted. This session think would have the stacks for each protocol version SessionOperation registered by protocol in a Tuple, for eventual callback. When the ProtocolOffered comes in we publish the tuple frame, with set selected version, to route to the correct SessionOperation to support each version of the protocol. >>> >>> With a non-specific vatId required, anonymous connections would be supported. >>> >>> - HH >>> >>> On Tue, Oct 24, 2017 at 12:52, Stephane Ducasse <stepharo.self(a)gmail.com> wrote: >>> >>>> Hi henry thanks for this announce. Can you tell where such protocols are used? Stef On Tue, Oct 24, 2017 at 6:33 PM, henry wrote: > Hi all, > > I am happy to announce the release of version 3.5 of ParrotTalk, for Squeak > and Pharo, found here: > > http://www.squeaksource.com/Cryptography/ParrotTalk-zzz.2.mcz > > It follows this specification: > https://github.com/ZiroZimbarra/callistohouse/blob/master/docs/ParrotTalkFr… > > One item of note, in version 3.5, the system connecting to a server, sending > the IWant msg, must know the vatId of the system being connected to. I am > considering changing this to version 3.6 by removing one round-trip in > messaging. Therefore, these messages would be combined: IWant/GiveInfo, > IAm/ReplyInfo. I will keep ProtocolOffered and ProtocolAccepted to allow > eLindaSession to support both versions: 3.5 and 3.6. > > Thoughts please? > > - HH

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Fwd: Re: [saag] Fw: [internet-draft-draft] ParrotTalk: Anonymous P2P encryption
by henry Nov. 5, 2017

Nov. 5, 2017

I am preparing an Internet Draft for submission through IETF. Listed below. Sent from ProtonMail Mobile > ---------- Forwarded message ---------- > From: Bob<robert.withers(a)protonmail.com> > Date: On Sat, Nov 4, 2017 at 13:56 > Subject: Fwd: Re: [saag] Fw: [internet-draft-draft] ParrotTalk: Anonymous P2P encryption > To: Bob <robert.withers(a)protonmail.com> > Cc: SAAG <saag(a)ietf.org> > > I updated the I-D located here: http://jmp.sh/VRejS2g > > Thank you for your consideration, > - HH > >> -------- Original Message -------- >> Subject: [saag] Fw: [internet-draft-draft] ParrotTalk: Anonymous P2P encryption >> Local Time: November 3, 2017 9:07 AM >> UTC Time: November 3, 2017 1:07 PM >> From: robert.withers(a)protonmail.com >> To: SAAG <saag(a)ietf.org> >> >> Good morning, >> >> I am forwarding this announcement of the ParrotTalk v3.6 specification and 2 reference implementations, in Squeak/Pharo and Java, to the SAAG list. I was advised that this mailing list regarding the Security Area is the correct home for this announcement. Below, I corrected the version of the Squeak/Pharo ParrotTalk code to version 11, interoperable with the Java version. I am proceeding to work on the Internet-Draft and I hope some discussion builds around this work. >> >> Thank you. >> - HH >> >>> -------- Original Message -------- >>> Subject: [internet-draft-draft] ParrotTalk: Anonymous P2P encryption >>> Local Time: November 2, 2017 9:19 PM >>> UTC Time: November 3, 2017 1:19 AM >>> From: henry(a)callistohouse.club >>> To: IETF <ietf(a)ietf.org> >>> >>> I have developed the ParrotTalk Protocol, and am starting an internet draft document[1] for submission to the process at IETF. >>> >>> ParrotTalk Protocol is documented in part here[2], while I have two implementations: 1 in Squeak/Pharo[3 a/b] and the other in Java[4 a/b]. The particulars of MAC key and ivSequence derivation, as well as constrained traffic signing, are the implementations, yet missing from the specification. They will be added to the internet-draft. >>> >>> How do I go about submitting a specification for ParrotTalk for IETF review and consideration? >>> >>> Thank you. >>> >>> - HH >>> - HH >>> - HH >>> - HH >>> - HH >>> - HH >>> - HH >>> - HH

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CodeCity in Pharo 6?
by Peter UhnÃ¡k Nov. 5, 2017

Nov. 5, 2017

Hi, I've tried installing Code City in Pharo6, and apart from the fixing the Configurations, there is a dependency on NBOpenGL, which doesn't play well with P6 ... complains about missing NB (which is understandable considering NB was replaced with UFFI)... So the question is... is this project still maintained? Thanks, Peter

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Re: [Pharo-users] Dynamically changing code in a safe way
by abdelghani ALIDRA Nov. 4, 2017

Nov. 4, 2017

Thank you guys for your answers and (very very) sorry for the delay. Yes. The "everything is an object" Makes things so simple and clear :) For me, this means that Pharo ensures âstructural consistencyâ. The functional coherence is not Â however guaranteed. I mean, two objects will be existing at the same time instead of one and this implies that some operating rules may be broken. The evolving philosophers problem is a typical example of such a thing. I shall play a bit with this and come back to you ;) Abdelghani On 23 Oct 2017, at 23:12, Richard Sargent <richard.sargent(a)gemtalksystems.com> wrote: This is a great question, Abdelghani. It comes down to the meaning of the phrase "everything is an object". When you wrote "currentBloc value", that caused the block [ 1 to:50 do: [:index |Transcript show: index. 100 milliSeconds asDelay wait]. Transcript cr. 1000 milliSeconds asDelay wait ] to evaluate. The fact that you hold a reference to that block elsewhere and change what object is referenced at some point does not change the fact that the block itself is executing. Until your code executes currentBloc value again, it won't start the new block executing. Imagine if I were to hand you a loaf of bread and tell you to feed it to the dog. If I were then to hand you another loaf of bread, the dog would continue eating the first loaf. We never told the dog to do anything else. On Mon, Oct 23, 2017 at 1:53 PM, abdelghani ALIDRA via Pharo-users <pharo-users(a)lists.pharo.org> wrote: ---------- Forwarded message ---------- From:Â abdelghani ALIDRA <alidrandco(a)yahoo.fr> To:Â <pharo-users(a)lists.pharo.org> Cc:Â Bcc:Â Date:Â Mon, 23 Oct 2017 20:53:51 +0000 (UTC) Subject:Â Dynamically changing code in a safe way Hi, If I create a class HotSwapping with the instance variable currentBLoc (and the corresponding accessors) and the following methods : HotSwapping>>initialize Â Â Â Â currentBloc := [ 1 to:50 do: [:index |Transcript show: index. 100 milliSeconds asDelay wait]. Transcript cr. 1000 milliSeconds asDelay wait ] HotSwapping>>run Â Â Â Â [10 timesRepeat: [ currentBloc value ]] fork I then do : obj := HotSwapping new run The âfunnyâ thing is that, when Transcript starts showing numbers, lets say : 12345678910 (i.e. the bloc is in the middle of its execution), I do obj currentBloc: [Transcript show: âHelloâ;cr. 1000 milliSeconds asDelay wait ] The Transcript does not stop showing numbers. It shows the Hello message only after the old bloc has finished executing (the entire line of number form 0 to 50 has been printed in the Transcript) So why does not this happen this way? Why the assignment of the new code is delayed until the end of the bloc execution? is it something related to threads execution or does Pharo implement some safety hot swapping mechanisms? Thanks in advance. Abdelghani

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Looking for game state
by Stephane Ducasse Nov. 4, 2017

Nov. 4, 2017

Hi I'm reading a nice book explaining Game AI logic and it uses state design patterns and I would like to take it as an example for a future book on AI in the future They have two little actors talking via a a queued message list. There is one miner and its wife. Now I'm looking for a better example :) I was thinking about Pokemon hunting but if you have other ideas I'm interested. Stef

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Passing context class with GTSpotter
by Peter UhnÃ¡k Nov. 3, 2017

Nov. 3, 2017

Hi, I'm extending Spotter and wonder how I can achieve the following. I have some domain model, for the sake of example let's imagine Item" and "Container" classes; where "Container" can contain other Items or Containers. Then I have a custom Spotter wrapper class that shows the initial Spotter cadidates and can perform something with the spotted objects. Object subclass: #MySpotterModel slots: { #container. #something }. MySpotterModel>>doSomethingWith: item something doSomethingTo: item MySpotterModel>>spotterContentFor: aStep <spotterOrder: 10> ^ aStep listProcessor title: 'Items'; candidatesLimit: Float infinity; allCandidates: [ container items ]; actLogic: [ :item | self doSomethingWith: item. aStep exit ]; matchSubstring So far so good. Now the problem is, that I would like to "dive" (right arrow) into a container further, so there would be (notice that I am already duplicating behavior) MySpotterModel>>spotterContentFor: aStep <spotterOrder: 10> ^ aStep listProcessor title: 'Items'; candidatesLimit: Float infinity; allCandidates: [ self items ]; actLogic: [ :item | "self doSomethingWith: item. "<<<<<<<------------ aStep exit ]; matchSubstring So my question is ... how can I "pass along" a custom instance? Thanks, Peter

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Re: [Pharo-users] "sourcetrail" a code browser for C++/Java
by rainer.winkler＠poaceae.de Nov. 3, 2017

Nov. 3, 2017

Hi Holger, thanks for mentioning the Software Exploration Tool Sourcetrail. I use it when I develop in C, it is now free for non commercial using. I already contactedÂ Eberhard GrÃ¤ther to discuss using Sourcetrail for other languages than C, C++ and Java. But this will probably at best take some time. So I am still using the Open Source Software Exploration Tool Moose2Model (www.moose2model.org) I developed. I use it for Smalltalk and SAP ABAP. It can be used in a similar way to Sourcetrail, but gives also the option to build commented and customized maps that can be stored and updated with new coding versions. Sourcetrail on the other hand gives much more details on the analyzed coding. I mentioned Sourcetrail in my talk at ESUG 2017 (https://www.slideshare.net/esug/do-visualizations-help-during-development-u… andÂ https://youtu.be/0ttLYM1tkek?list=PLJ5nSnWzQXi_THfKwhzxFwbXy00YTi0uv&t=1008 ) Cheers Rainer -----Original-Nachricht----- > Betreff: Pharo-users Digest, Vol 54, Issue 175 > Message: 5 > Date: Fri, 27 Oct 2017 13:11:26 +0800 > From: Holger Freyther <holger(a)freyther.de> > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > Subject: [Pharo-users] "sourcetrail" a code browser for C++/Java > Message-ID: <30393F2B-BEC7-4FF4-AFDD-E467934D98B8(a)freyther.de> > Content-Type: text/plain; charset=us-ascii > > Hi, > > I was just watching some videos and stumbled across sourcetrail[1][2]. The visualizations look pretty neat. Maybe it can be used an inspiration? > > cheers > > Â Â Â Â Â holger > > > [1] https://www.youtube.com/watch?v=r8S6V6U5Vr4 > [2] https://www.sourcetrail.com

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NeoCSV #skipToNextLine or #skipRemainingColumns ?
by PAUL DEBRUICKER Nov. 3, 2017

Nov. 3, 2017

Hi - I want to import the first and seventh column from a set of 50 csv files each of which could have 28 - 34 columns. Is there a way to have NeoCSV skip the remaining columns automatically (e.g. 8 and up) ? Thanks Paul

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New Pharo Booklet
by Stephane Ducasse Nov. 3, 2017

Nov. 3, 2017

Hi guys I just published a new little booklet on Pharo tips and tricks! Available at: http://books.pharo.org Feedback and contributions are welcome as usual. Stef

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