February 2020 - Pharo-users

[pharo8-api-change] #mouseEnter event on Menu
by Hilaire Feb. 28, 2020

Feb. 28, 2020

Hi, On P8, the code bellow does not generate the #mouseEnter event when the cursor enter the menu. This code was working on P7. Any idea why it is not working on P8 :-) Â Â Â menuBar Â Â Â Â Â Â add: 'Macro-construction' translated Â Â Â Â Â Â font: self theme menuBarFont Â Â Â Â Â Â icon: nil Â Â Â Â Â Â help: 'Build or execute macro-construction. A macro is a construction template you can apply to items in the sketch area.' translated Â Â Â Â Â Â subMenu: self macroconstructionMenu. Â Â Â menuBar lastSubmorph Â Â Â Â Â Â on: #mouseEnter Â Â Â Â Â Â send: #updateMacroMenu Â Â Â Â Â Â to: self. Thanks Hilaire -- Dr. Geo http://drgeo.eu

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Pharo as a client to swagger API?
by Jerry Kott Feb. 27, 2020

Feb. 27, 2020

Hello, I know people have used Pharo for REST APIs - has anyone used Pharo as a client for Swagger? Second question (I could probably find out but I am feeling lazy): what would be a good REST API package to use? Are there any tutorials? Jerry Kott This message has been digitally signed. PGP Fingerprint: A9181736DD2F1B6CC7CF9E51AC8514F48C0979A5

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[Pharo8-api-change] announcer for model
by Hilaire Feb. 27, 2020

Feb. 27, 2020

Hi, Now Model are required to understand announcer, for example in: UITheme>>newTextEntryIn: aThemedMorph for: aModel get: getSel set: setSel class: aClass getEnabled: enabledSel help: helpText What is the rational behind, should my model be subclass of Model (which I prefer not) or implement announcer? Then, how should it be cleanup? The RubPLuggableText* classes replacement breaks my code in two places. In P8 I see these classes are in Compatibility-toBeDEprecated package.. Hilaire -- Dr. Geo http://drgeo.eu

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DNS over HTTPS (DoH) in Pharo
by Sven Van Caekenberghe Feb. 26, 2020

Feb. 26, 2020

Hi, Today Firefox switched over to using 'DNS over HTTPS (DoH)' by default. https://blog.mozilla.org/netpolicy/2020/02/25/the-facts-mozillas-dns-over-h… We can do this in Pharo as well, even out of the box (minus the interpretation of the results, but still). First, what is this ? A good description is: https://developers.cloudflare.com/1.1.1.1/dns-over-https/ Using the Cloudflare server, we can do the following in Pharo, using the JSON wire format. ZnClient new url: 'https://cloudflare-dns.com/dns-query'; accept: 'application/dns-json'; queryAt: #name put: 'pharo.org'; queryAt: #type put: 'A'; contentReader: [ :entity | STONJSON fromString: entity contents ]; get. The actual address can be accessed inside the returned result. SocketAddress fromDottedString: (((ZnClient new url: 'https://cloudflare-dns.com/dns-query'; accept: 'application/dns-json'; queryAt: #name put: 'pharo.org'; queryAt: #type put: 'A'; contentReader: [ :entity | STONJSON fromString: entity contents ]; get) at: #Answer) first at: #data). If you load the following code, https://github.com/svenvc/NeoDNS it is just as easy to use the binary UDP wire format. ZnClient new url: 'https://cloudflare-dns.com/dns-query'; accept: 'application/dns-message'; contentWriter: [ :message | ZnEntity with: message asByteArray type: 'application/dns-message' ]; contentReader: [ :entity | DNSMessage readFrom: entity readStream ]; contents: (DNSMessage addressByName: 'pharo.org'); post. Again, the actual address can be accessed inside the returned object. (ZnClient new url: 'https://cloudflare-dns.com/dns-query'; accept: 'application/dns-message'; contentWriter: [ :message | ZnEntity with: message asByteArray type: 'application/dns-message' ]; contentReader: [ :entity | DNSMessage readFrom: entity readStream ]; contents: (DNSMessage addressByName: 'pharo.org'); post) answers first address. Incidentally, a more robust answer can be got as follows: NeoSimplifiedDNSClient default addressForName: 'pharo.org'. Sven

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[ANN] Open source Pharo application "mediaclue"
by Brodbeck Andreas Feb. 25, 2020

Feb. 25, 2020

Hi all I'm a Pharo lover since many years. A huge thanks to all of you, making Pharo possible! As a giving back I would like to open source some of my business projects (Thanks to my supporting customers, too). The first is a web based media assets management called "mediaclue" (Think of it as a image/audio/video/document sharing platform, e.g. for teachers inside a school): *********************************************** https://github.com/talk-small-be-open/mediaclue *********************************************** (Everything is ready for simple install into a fresh Linux server with included Ansible provisioning scripts to create the whole appliance) Cheers! Andreas P.S. The UI language is still german at the moment, but that should turn multilanguage eventually ----------------------------------------- Brot? www.brotrezept.ch! Andreas Brodbeck Software-Macher mindclue GmbH Dipl. El.-Ing. ETH +41 55 622 26 24 www.mindclue.ch -----------------------------------------

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Re: [Pharo-users] Problem with ZnWebSocket and closed connections
by Sven Van Caekenberghe Feb. 25, 2020

Feb. 25, 2020

Hi Davide, First I'll explain why you see a difference in behaviour, then I'll give you a solution. Network connections are expensive resources, most servers try to close them as soon as possible when they are not used. Zinc HTTP Components does not normally close connections by itself, although timeouts do naturally occur. The WebSocket code normally loops on the server side when timeouts occur while waiting for incoming messages (more specifically in ZnWebSocket>>#runWith:). Note that even though it loops, there is no actual communication. Both previous facts, not closing unused connections and looping on timeouts, result in a working echo/chat example, when run locally. When you put a proxy in front of this, the proxy (like nginx) might decide to close an unused connection. This is allowed and it is what you are seeing. This is not an error and thus normal. Of course, you might want to keep such connection open for longer, even if they are not used. This can be done by keeping them alive. Note however that this might result in many open connections. How do you keep a connection alive ? One solution is to do this at the application level. ZnWebSocketStatusHandler does this by sending a message every second. The WebSocket protocol (https://tools.ietf.org/html/rfc6455) does define a number of control messages, all which were already implemented as such. Two of these messages, ping & pong, are meant to be used for implementing keep alive. Client side, this was already done (ZnWebSocket>>#handleControlFrame:). I now added automatic keep alive message sending server side as well. This can be seen in the updated implementation of ZnWebSocket>>#runWith: https://github.com/svenvc/zinc/commit/9073acc2fad197c2787c6cd0f4d315981ebb9… Now, whenever the read times out (as defined by the socket stream's timeout, a Zn setting), a ping control packet is sent to keep the connection alive, the client will answer with a pong, and then the server loops. This should be sufficient to solve your issue (but both the proxy's as well as the Zn timeout need to be compatible, Zn's needs to be smaller). Please let me know if this works for you. Regards, Sven > On 23 Feb 2020, at 18:19, Davide Varvello via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Davide Varvello <varvello(a)yahoo.com> > Subject: Re: Problem with ZnWebSocket and closed connections > Date: 23 February 2020 at 18:19:02 GMT+1 > To: pharo-users(a)lists.pharo.org > > > Hi, > > I put nginx as a websocket proxy and I run the ZnWebSocketEchoHandler. > Unfortunately also with this configuration the connection closes it after a > couple of minutes of inactivity > > Cheers > Davide > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > >

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Re: Ubuntu64 install fine, would like to port to Slackware64
by tty Feb. 25, 2020

Feb. 25, 2020

I was able to launch both the launcher and the latest 9.0 image without error by creating symlinks in /usr/lib to the appropriate libraries in /usr/lib64 libcurl-gnutls.so.4 -> /usr/lib64/libcurl.so libgit2.so -> /usr/lib64/libgit2.so libgit2.so.0.28.3 -> /usr/lib64/libgit2.so.0.28.3 libgit2.so.28 -> libgit2.so.0.28.3 cheers. t -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Loading Bootstrap in Pharo 8
by syzygy Feb. 25, 2020

Feb. 25, 2020

I am testing the new image of Pharo 8 (Pharo Contribution Jenkins) with pre-installed seaside. When trying to load the Torsten Bootstrap: Gofer new url: 'http://smalltalkhub.com/mc/TorstenBergmann/Bootstrap/main'; package: 'ConfigurationOfBootstrap'; load (Smalltalk at: #ConfigurationOfBootstrap) project stableVersion load I get the following error: Name not found: Seaside-Pharo-Development My question is: is this supposed to work on Pharo 8? Thank you, Martin. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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[ANN] Next Pharo Sprint: Feb 28
by Marcus Denker Feb. 25, 2020

Feb. 25, 2020

We will organize a Pharo sprint / Moose dojo Feb 28, starting at 10:00am. (Local Time Paris). Goals of this sprint: - Pharo 8: Fix issues from tracker https://github.com/pharo-project/pharo/issues Remote Sprint: Remotely, you can join us on Discord. During the sprint, we synchronize local and remote Pharo sprinters: http://pharo.org/contribute-events We have added a Board to coordinate the work: https://github.com/orgs/pharo-project/projects/9 Known Local Sprint meetings - Lille/France: It will be at the Inria Lille, Building B, third floor (RMoD offices). As the building is not open to the public, please contact us before if you plan to come A list of all Pharo Event of the year an be found here: https://association.pharo.org/events

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What is the difference between a form and a morph?
by Steve Quezadas Feb. 25, 2020

Feb. 25, 2020

I usually like to go through the source code to answer my own question, but I can't tell by reading it. [Morph], from what I understand, deals with manipulating graphics on smalltalk. But when I use ZnEasy to get a jpeg file, I notice that it returns a [Form] and not a [Morph] to display a jpeg. Spec2 also wants [Form] for displaying images rather than [Morph]. So what is the difference between a [Form] and a [Morph] since they both seem to deal with graphics?

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