December 2019 - Pharo-users

Ring, Athena, Rubric, Calypso, Morphic, Block,â¦

by Kasper Ãsterbye

Cheers I was wondering if there is somewhere all these subparts of Pharo are listed, and if it is also listed (and maintained) which ones are on their way out, and which are being updated and to what. I still find it truly baffling. What I am looking for is a list somewhat like this: * Ring (RG), A Model to allow Calypso browser (and other tools) to access source-code outside the image using the same protocols as those inside the image. A lot of name changes from Pharo 7 to 8. * Rubric (Rub), the fundamental Text edit classes in Pharo. Used inside most of the text editing tools of Pharo. Took over after âTextMorphâ. ??? Is it about to be deprecated??? * Morphic, The fundamental classes for building graphical user interfaces in Smalltalk and Pharo since Squeak. In principle on its way out, but â¦. I do not even know if those three lines are true!!! Is there such a list somewhere? Is it still worth the effort to dive deeper into Morph?, Will there ever be a TxText as mentioned in the class comment of RubAbstractTextArea? â¦??? Best, Kasper

Dec. 5, 2019

Re: [Pharo-users] Cache for ZnClient

by Esteban Maringolo

I created a ZnCachingClient subclass of ZnClient, and I cache GET requests responses on disk. The overview is here: https://gist.github.com/eMaringolo/bed9974d70c9ab8c6398149716e22b08 I don't differentiate about content type nor encoding, because for my use case I'm only caching text/html responses. It's simple, but it works pretty well and saved me a lot of time in the debugging of the scrapper :-) Regards! Esteban A. Maringolo Esteban A. Maringolo On Wed, Dec 4, 2019 at 6:58 PM Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Hi Sven, > > Yeap, building something would be fairly easy, I just wanted to avoid doing it. > Or to know where I should "hook" such cache lookup in the ZnClient > before performing the actual network request. > > Regards, > > > > Esteban A. Maringolo > > On Wed, Dec 4, 2019 at 6:27 PM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > > > Hi Esteban, > > > > > On 4 Dec 2019, at 21:35, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > > > > > Is there any library/setting that adds "cache" to ZnClient? > > > > > > I'm doing some web scrapping with ZnClient, and sometimes I request > > > the same pages (~300) more than once, and I'd like to save requests > > > (and time) by simply retrieving what's in the cache (since the content > > > doesn't change frequently). > > > > > > Maybe there other way is to put an HTTP proxy in between and ask the > > > local proxy. > > > > > > Regards, > > > > > > Esteban A. Maringolo > > > > No, this does not exist as such, not in public code anyway, AFAIK. > > > > In our codebase there is a RestJsonClient which holds onto an httpClient and a CachingRestJsonClient as a subclass of that one, that add a cache url->json with time and number of entries based lru invalidation. > > > > It would not be too hard to built this yourself. > > > > Sven > > > >

Dec. 4, 2019

Re: [Pharo-users] Cache for ZnClient

by Esteban Maringolo

Hi Sven, Yeap, building something would be fairly easy, I just wanted to avoid doing it. Or to know where I should "hook" such cache lookup in the ZnClient before performing the actual network request. Regards, Esteban A. Maringolo On Wed, Dec 4, 2019 at 6:27 PM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Hi Esteban, > > > On 4 Dec 2019, at 21:35, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > > > Is there any library/setting that adds "cache" to ZnClient? > > > > I'm doing some web scrapping with ZnClient, and sometimes I request > > the same pages (~300) more than once, and I'd like to save requests > > (and time) by simply retrieving what's in the cache (since the content > > doesn't change frequently). > > > > Maybe there other way is to put an HTTP proxy in between and ask the > > local proxy. > > > > Regards, > > > > Esteban A. Maringolo > > No, this does not exist as such, not in public code anyway, AFAIK. > > In our codebase there is a RestJsonClient which holds onto an httpClient and a CachingRestJsonClient as a subclass of that one, that add a cache url->json with time and number of entries based lru invalidation. > > It would not be too hard to built this yourself. > > Sven > >

Dec. 4, 2019

Re: [Pharo-users] Cache for ZnClient

by Sven Van Caekenberghe

Hi Esteban, > On 4 Dec 2019, at 21:35, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Is there any library/setting that adds "cache" to ZnClient? > > I'm doing some web scrapping with ZnClient, and sometimes I request > the same pages (~300) more than once, and I'd like to save requests > (and time) by simply retrieving what's in the cache (since the content > doesn't change frequently). > > Maybe there other way is to put an HTTP proxy in between and ask the > local proxy. > > Regards, > > Esteban A. Maringolo No, this does not exist as such, not in public code anyway, AFAIK. In our codebase there is a RestJsonClient which holds onto an httpClient and a CachingRestJsonClient as a subclass of that one, that add a cache url->json with time and number of entries based lru invalidation. It would not be too hard to built this yourself. Sven

Dec. 4, 2019

Cache for ZnClient

by Esteban Maringolo

Is there any library/setting that adds "cache" to ZnClient? I'm doing some web scrapping with ZnClient, and sometimes I request the same pages (~300) more than once, and I'd like to save requests (and time) by simply retrieving what's in the cache (since the content doesn't change frequently). Maybe there other way is to put an HTTP proxy in between and ask the local proxy. Regards, Esteban A. Maringolo

Dec. 4, 2019

Re: [Pharo-users] some sort of mentor help ?

by Todd Blanchard

I looked at the site and I knocked out day 1. These are little programming puzzles you can do in a playground. Day 1's first puzzles is literally a 1 liner. The story telling obfuscates the problem and can make the problem seem harder than it is. You have to learn to cut through the noise and see the problem. You are supposed to find the amount of fuel required to launch a given mass into space in a rocket. This is the key paragraph. "Fuel required to launch a given module is based on its mass. Specifically, to find the fuel required for a module, take its mass, divide by three, round down, and subtract 2." The code for this is: fuel := (mass / 3) floor - 2. The floor function rounds downwards. To round up you use ceiling. You have a list of modules though. If you click to get your module mass list, its a page with one number per line. Getting this into a collection is really easy. masses := #( <paste contents of input data copied from web page here> ) and execute that in your playground. This is your input data. To get the fuel for each mass, a collect: seems like a winner. fuels := masses collect: [:mass | (mass / 3) floor - 2 ]. The final thing he wants is the total amount of fuel required. You just add up the numbers. total := fuels sum. I leave the second puzzle of day 1 to you, it is almost the same except you have to iteratively calculate the fuel to lift the fuel you add. To do this you end up putting a loop into the collect; block and executing it over and over until the amount of additional fuel is <= zero. I hope this gets you going. You can email me directly at tblanchard(a)mac.com if you get stuck. > On Dec 3, 2019, at 2:54 PM, Roelof Wobben via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Roelof Wobben <r.wobben(a)home.nl> > Subject: some sort of mentor help ? > Date: December 3, 2019 at 2:54:19 PM PST > To: pharo-users(a)lists.pharo.org > > > Hello, > > do not know if this is the right channel but is there someone or some book which can help me learn how to approach complex problems like the AdventOfCode challenges , I try that but im stuck because most of the time I have the feeling I choose a difficult solution where some easier one exist. > or I have a very bad plan > that is a wall I hit many times with my languages and I need a way to get out of it and make a step further with Pharo > > Regards, > > Roelof > > >

Dec. 3, 2019

some sort of mentor help ?

by Roelof Wobben

Dec. 3, 2019

Re: [Pharo-users] uFFI: Debugging "External module not found" Error

by Ben Coman

> > > On Dec 3, 2019, at 11:34 AM, Sean P. DeNigris <sean(a)clipperadams.com> > wrote: > > > > Alistair Grant wrote > >> The same message is returned whether the module itself isn't found, or > >> if one of its dependencies can't be found. > Secondary dependencies are awkward to track via command line. > > > > Good to know. I wonder if we can't provide more detailed error messages > > here... > The following turned up in a search (I've no experience with it), but could be useful... https://linux.die.net/man/7/rtld-audit Or perhaps the system can examine the DYNAMIC section of an ELF to pre-load each dependency. >From the image, something in part equivalent to... https://github.com/finixbit/elf-parser/blob/master/elf_parser.cpp GT inspector on an ELF file could an interesting demo ;) btw, I wasn't aware of how "Runtime Search Path: Security" affected the search path... https://amir.rachum.com/blog/2016/09/17/shared-libraries/ > Alistair Grant wrote > >> On linux you can check dependencies with `ldd file.so`, I don't know > >> what the Mac equivalent is. > > > > Apparently, it's `otool -L whatever.dylib`, which returns: > > @rpath/libvlc.dylib (compatibility version 12.0.0, current version > 12.0.0) > > @rpath/libvlccore.dylib (compatibility version 10.0.0, current > version > > 10.0.0) > > /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current > version > > 1252.50.4) > > /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current > version > > 7.0.0) > On Wed, 4 Dec 2019 at 03:58, Todd Blanchard via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > This is the most annoying thing about UFFI - the library search seems to > opaque and I don't understand how it works. > > So far I am finding best practice is to find the library yourself and then > provide the exact file path you want. > > That way, you can actually prompt the user to find it if you don't and > they get a decent experience. > cheers -ben P.S. an interesting side article... https://medium.com/forensicitguy/whitelisting-ld-preload-for-fun-and-no-pro…

Dec. 3, 2019

Re: [Pharo-users] uFFI: Debugging "External module not found" Error

by Todd Blanchard

This is the most annoying thing about UFFI - the library search seems to opaque and I don't understand how it works. So far I am finding best practice is to find the library yourself and then provide the exact file path you want. That way, you can actually prompt the user to find it if you don't and they get a decent experience. > On Dec 3, 2019, at 11:34 AM, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > > Alistair Grant wrote >> The same message is returned whether the module itself isn't found, or >> if one of its dependencies can't be found. > > Good to know. I wonder if we can't provide more detailed error messages > here... > > > Alistair Grant wrote >> On linux you can check dependencies with `ldd file.so`, I don't know >> what the Mac equivalent is. > > Apparently, it's `otool -L whatever.dylib`, which returns: > @rpath/libvlc.dylib (compatibility version 12.0.0, current version 12.0.0) > @rpath/libvlccore.dylib (compatibility version 10.0.0, current version > 10.0.0) > /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version > 1252.50.4) > /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version > 7.0.0) > > > Still investigating... > > > > ----- > Cheers, > Sean > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

Dec. 3, 2019

Re: [Pharo-users] uFFI: Debugging "External module not found" Error

by Sean P. DeNigris

Alistair Grant wrote > The same message is returned whether the module itself isn't found, or > if one of its dependencies can't be found. Good to know. I wonder if we can't provide more detailed error messages here... Alistair Grant wrote > On linux you can check dependencies with `ldd file.so`, I don't know > what the Mac equivalent is. Apparently, it's `otool -L whatever.dylib`, which returns: @rpath/libvlc.dylib (compatibility version 12.0.0, current version 12.0.0) @rpath/libvlccore.dylib (compatibility version 10.0.0, current version 10.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4) /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0) Still investigating... ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Dec. 3, 2019