- Pharo-users - lists.pharo.org

Re: [Pharo-users] CannotWriteData errors in P3 and Seaside
by Esteban Maringolo Aug. 21, 2020

Aug. 21, 2020

Hi, I'm replying to the list as well... because the last two mails got replied to our personal addresses. On Thu, Aug 20, 2020 at 11:55 AM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > On 20 Aug 2020, at 15:31, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > > > Hi Sven, > > > > If a socketstream doesn't know the state of the connection, then what > > is the #socketIsConnected method for? In particular the > > #isOtherEndClosed test. > > > > ZdcAbstractSocketStream>>#socketIsConnected > > ^socket isConnected and: [ socket isOtherEndClosed not ] > > I don't know what is going on inside Socket, I just stated my opinion. Maybe there is something to investigate here? > With logging enabled, I can do the following: > > $ grep P3 server-2020-08-20.log | grep CONNECT | tail -n 20 > <snip> > 2020-08-20 14:43:06 [P3] 30513 DISCONNECTING psql://client-xyz:hiddenpassword@client-xyz-db:5432/client-xyz > 2020-08-20 14:44:06 [P3] 30516 CONNECTED psql://client-xyz:hiddenpassword@client-xyz-db:5432/client-xyz > 2020-08-20 14:44:06 [P3] 30516 DISCONNECTING psql://client-xyz:hiddenpassword@client-xyz-db:5432/client-xyz > 2020-08-20 14:44:06 [P3] 30517 CONNECTED psql://client-xyz:hiddenpassword@client-xyz-db:5432/client-xyz > 2020-08-20 14:44:06 [P3] 30517 DISCONNECTING psql://client-xyz:hiddenpassword@client-xyz-db:5432/client-xyz > > The number after [P3] is the session identifier (backend process id) of that connection. You should see each one being opened and closed in pairs. Yes, I noticed the pid, and compared it with what I had on the pg_stat_activity table. I don't get the CONNECTED log because there is no way to set the logging in the P3DatabaseDriver before it creates (and connects) the P3Client. Maybe there could be a setting on P3Client class to set verbosity globally? Or at the P3DatabaseDriver instead. Summarizing... I'm pretty confident that P3 works correctly and also the PG server. At this point I'm factoring out what might be causing this. It's an issue that only happens to me in production, and I don't have a better instrumentation in place to debug it. Again, thanks for the support. Regards.

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CannotWriteData errors in P3 and Seaside
by Esteban Maringolo Aug. 19, 2020

Aug. 19, 2020

Hi all, Sven ;-) I'm having erratic P3 errors in a recent application I wrote using Pharo, Seaside and Glorp with P3 as driver. Each Seaside session has a GlorpSession, which in turn has a P3Connection in its accessor. I don't know why, but sometimes the P3Connection socket is closed, and then when trying to read from the database, it cannot write the query to the P3 socket and exception is raised, and it isn't handled by the P3DatabaseDriver (automatically trying to reconnect?). I don't know if I'm doing something wrong, I plan to migrate the GlorpPooledDatabaseAccessor and also use the P3ConnectionPool, but I want to be sure that the current setup works of if maybe I'm exceeding some limit or timeout that causes the connection to be closed. Regards! Esteban A. Maringolo

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Disable halt and breakpoints globally
by Esteban Maringolo Aug. 19, 2020

Aug. 19, 2020

Hi, I was bit by a bug in production I couldn't identify and it ended up being a lost halt in the code that was hanging my whole image. So no bug at all, a feature :-) Is there a way to disable the #halt and breakpoints? This way I could add such an expression (if existent) to my server startup and avoid issues like this. Regards! Esteban A. Maringolo

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UK Smalltalk User Group meeting - Wednesday, August 26th
by Giovanni Corriga Aug. 18, 2020

Aug. 18, 2020

The next meeting of the UK Smalltalk User Group will be on Wednesday, August 26th. In this meeting, Erik Stel will present his current project - CodeParadise. CodeParadise is a cloud based platform (to be) to learn to program using Object Oriented principles within a Smalltalk environment. CodeParadise is still in very early development, but some of its results have seen interest from the community. Therefore a presentation will provide insight in the design, current status, and possibilities of the results so far. The discussion afterwards can be used for both in-depth technical topics as well as the more philosophical topics about programming (as warmth and/or beer consumption will guide us). Given the current COVID-19 restrictions, this will be an online meeting from home. If you'd like to join us, please sign up in advance on the meeting's Meetup page https://www.meetup.com/UKSTUG/events/cbklbrybclbjc/ to receive the meeting details. Donât forget to bring your laptop and drinks! Cheers, Giovanni

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Difference between VM and image
by robert＠robkuz.com Aug. 18, 2020

Aug. 18, 2020

Hi, I am trying to find out what the difference between an VM and an Image is when using Pharo. Can anybody give some hints (links to docs?) Thx Ciao robertj

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Move image
by robert＠robkuz.com Aug. 17, 2020

Aug. 17, 2020

Hi, when I create a new image using the launcher then the image will be created at the following location (C:\Users\robert\Documents\Pharo\images\Pharo 8.0 - 64bit (stable)). Is there a way to define a different location when creating an image (or afterwards)? Best regards Robert

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GTK3 / PDF Viewer
by robert＠robkuz.com Aug. 17, 2020

Aug. 17, 2020

Hi, what is the best way to integrate a PDF Viewer with a Spec2 / GTK3 application on Windows? I couldn't find any mentioning of PDF viewer on the GTK3 site. Thx for your help Best Robert

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[ANN] Smalltalk's Successor
by Richard Kenneth Eng Aug. 13, 2020

Aug. 13, 2020

https://smalltalk.tech.blog/2020/08/10/smalltalks-successor/ A bold claim. It'll be interesting to see if anybody challenges me on this.

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Intermediate-Level Tutorials for Pharo
by tbrunz Aug. 12, 2020

Aug. 12, 2020

tl;dr: I have some ideas about more advanced Pharo tutorials, and I have an example that I would like to have reviewed/critiqued before I develop it any further. I've been thinking lately that it would be nice to expand the number of Pharo tutorials we have available. But rather than (or along with) creating more "beginner" level tutorials, I'd like to see some good "intermediate" level Pharo tutorials. I think that programmers who already know the Pharo syntax and messaging semantics could benefit from more advanced tutorials that demonstrate how to develop "real world" Pharo code for "real world" processing needs. What I'm talking about is something that assumes you know the language, the basics of the IDE (but not necessarily how to leverage its capabilities to aid development), and the basics of the foundation classes (but not its details). I'd like a tutorial for intermediate Pharo programmers who want to become experts with Pharo. Something that can show you how to apply the tools of the IDE and the features of the language and base classes to create solutions that solve complex problems. What does the community think of this idea? -Ted -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Aug. 11, 2020

Hi guys I wrote this https://thepharo.dev/2020/08/11/transcript-the-misunderstood-global/ <https://thepharo.dev/2020/08/11/transcript-the-misunderstood-global/> because I thought that I had to :) See Chapter 8 for a longer version https://github.com/SquareBracketAssociates/Booklet-PharoWithStyle/releases/… <https://github.com/SquareBracketAssociates/Booklet-PharoWithStyle/releases/…> S. -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle 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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