May 2016 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Zinc Server name
by Sven Van Caekenberghe May 28, 2016

May 28, 2016

Torsten asked how to change the server name as seen in HTTP responses: $ curl -v http://localhost:1701/echo * Trying 127.0.0.1... * Connected to localhost (127.0.0.1) port 1701 (#0) > GET /echo HTTP/1.1 > Host: localhost:1701 > User-Agent: curl/7.43.0 > Accept: */* > < HTTP/1.1 200 OK < Content-Length: 245 < Content-Type: text/plain;charset=utf-8 < Server: Zinc HTTP Components 1.0 < Date: Sat, 28 May 2016 11:30:43 GMT < This is Zinc HTTP Components echoing your request ! Running a ZnManagingMultiThreadedServer(running 1701) GET request for /echo with headers X-Zinc-Remote-Address: 127.0.0.1 Host: localhost:1701 User-Agent: curl/7.43.0 Accept: */* As you can see, the default header is 'Server: Zinc HTTP Components 1.0'. We don't need specific API for this uncommon scenario, as all requests and response are object that you can manipulate at will. We can do this programmatically as follows: | delegate | ZnServer startDefaultOn: 1701. delegate := ZnServer default delegate. ZnServer default delegate: (ZnValueDelegate with: [ :request | | response | response := delegate handleRequest: request. response headers at: #Server put: 'My HTTP Server 3.14'. response ]). The default handler of the server gets wrapped, the original is used to do the actual work, when it returns a response, we manipulate it as required. Now, the server name has changed: $ curl -v http://localhost:1701/echo * Trying 127.0.0.1... * Connected to localhost (127.0.0.1) port 1701 (#0) > GET /echo HTTP/1.1 > Host: localhost:1701 > User-Agent: curl/7.43.0 > Accept: */* > < HTTP/1.1 200 OK < Content-Length: 245 < Content-Type: text/plain;charset=utf-8 < Server: My HTTP Server 3.14 < Date: Sat, 28 May 2016 11:31:03 GMT < This is Zinc HTTP Components echoing your request ! Running a ZnManagingMultiThreadedServer(running 1701) GET request for /echo with headers X-Zinc-Remote-Address: 127.0.0.1 Host: localhost:1701 User-Agent: curl/7.43.0 Accept: */* Sven > On 27 May 2016, at 17:11, Torsten Bergmann <astares(a)gmx.de> wrote: > > Hi Sven, > > A quick example (shared on the list) would be really nice! > Not urgent but I'm sure useful for many people using Pharo as webserver. > Security always is an issue. > > Thanks > Torsten > >> Gesendet: Freitag, 27. Mai 2016 um 16:33 Uhr >> Von: "Sven Van Caekenberghe" <sven(a)stfx.eu> >> An: "Torsten Bergmann" <astares(a)gmx.de> >> Betreff: Re: Zinc Server name >> >> Hi Torsten, >> >>> On 27 May 2016, at 15:59, Torsten Bergmann <astares(a)gmx.de> wrote: >>> >>> Hi Sven, >>> >>> In Zinc the defaultServerString returns the frameworkNameAndVersion. >>> This is used in the HTTP responses, ... >>> >>> In a production situation one might give as little info to hackers >>> as possible about the server for security reasons. >>> >>> For sure I can patch the method but it would be good if the framework >>> could provide this out of the box. >>> >>> Having this as a setting (with the framework name as default) >>> would already solve the problem. What do you think? >>> >>> bye >>> Torsten >> >> This is a valid concern/request. However, it does not appear to be that important to make it a user settable option. You can easily add this yourself, without changing any method. >> >> Wrap another delegate around the delegate of the Zn server and intercept any response being returned, modify the Server: header and you're done. This is similar to how you would do pre/post request/response fiddling in apache or nginx. >> >> Does that make sense or should I write a small example ? >> >> Sven

1 0

Panama Papers: a case for reproducible research, data activism and frictionless data (powered by Pharo)
by Offray Vladimir Luna CÃ¡rdenas May 27, 2016

May 27, 2016

Hi, I'm glad to share my recent work with Pharo/Roassal in the form of a minisite[1] and a detailed blog entry[2] arguing about interactive environments for increasing understanding and participation in data phenomena: [1] http://mutabit.com/repos.fossil/panama-papers/doc/tip/index.html [2] http://mutabit.com/offray/blog/en/entry/panama-papers-1 Using a relatively simple visualization I advocate for this case. The bigger issues here were not related with visualization, but with accuracy/completion of the information. For example the original RTSVGPath includes only 167 world territories, but Panama Papers mentions over 210. Improving accuracy lead to hunting a bug and to its bugfix. So we have a more cleaver reader for SVG in Roassal. I was fighting for several days with newbie errors (like the one on the download bar not advancing, despite of the download being made). I think that this are good exemplars on how Pharo Roassal is a superb moldable and affordable platform on the issues of data oriented reproducible research (in journalism and/or activism and others). Comments and suggestions are welcomed, as always. Cheers, Offray

2 4

library for comparing semver versions
by Peter Uhnak May 27, 2016

May 27, 2016

Hi, is there any library available that can compare versions according to SemVer? http://semver.org/ Thanks, Peter

3 2

Re: [Pharo-users] Week number from a date
by Ben Coman May 27, 2016

May 27, 2016

On Thu, May 12, 2016 at 9:47 PM, Davide Varvello via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > ---------- Forwarded message ---------- > From: Davide Varvello <varvello(a)yahoo.com> > To: pharo-users(a)lists.pharo.org > Cc: > Date: Thu, 12 May 2016 06:10:12 -0700 (PDT) > Subject: Week number from a date > Hi guys, > > Is there a way to have the week number when a date is given? > > Ex: 2016/01/13 gives 2, 2016/01/19 gives 3, and so on It seems the answer is no. But to expand on how I determined that, in the interest of teaching how to fish... 1. Open World > Tools > Finder 2. Select examples 3. Enter.... Date readFromString: '2016/01/13' . 2016 4. Click <Search> This returns one result, the message #year. 5. Next trying.... Date readFromString: '2016/01/13' . 3 This returns no result. Think of the search term as an array of two objects separated by the period. The first object is the receiver of the message. The last object is the result. Any additional objects in between are message parameters. Try this one.... #(5 6 7 8) . 2 . #(5 6) On Fri, May 13, 2016 at 12:24 AM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > https://en.wikipedia.org/wiki/Week#Week_numbering > > of course, not all countries have the same definition of week. > furthermore, week number does not seem to be so simple. Interesting to know. But I see this already seems hard coded... Date nameOfDay: 1 "--> #Sunday" Timespan subclass: #Date poolDictionaries: 'ChronologyConstants' ChronologyConstants class >> initialize DayNames := #(Sunday Monday Tuesday Wednesday Thursday Friday Saturday). Also seems to have changed at some point, with the historical nameOfDay recorded in the Terse Guide [1] circa 2010 shown to be different. Perhaps this is something we should make a regional preference. Was there any ongoing works on other regional preferences? [1] http://wiki.squeak.org/squeak/5699 cheers -ben

4 3

Having STON generate flatter output
by Peter UhnÃ¡k May 26, 2016

May 26, 2016

Hi, is it possible to configure STON to generate more flat output? Imagine a scenario where an element can have children and the children have reference to their parent â Now the problem is that the output of STON will depend on the order of the items, so if I have "nice" ordering for the following, I will get a flat output â If however the ordering is different, the output will be more nested â As the ordering is not stable, I often end up with results like this (zoomed out) â The image above has depth of about fourteen, even though it could be represented with just depth of four. In the current state I cannot actually look at the generated output because it's impossible to find anything, which is problematic when an error occurs. So the question is if it is possible to push the actual objects as far up as possible, and use references "@12" only on the deeper levels. Thanks, Peter

4 4

Problem with Mongo on Pharo5 ("collection already exists")
by Sabine Manaa May 26, 2016

May 26, 2016

Hi, Is anyone already running Pharo5 with mongoDB already? loading my configurationOf in a new pharo5 image results in a problem with mongDB. loading the same in Pharo4 works fine. I reduced the problem to the following steps for reproduction: 1) start Pharo5 and install VoyageMongo from the ProjectCatalog 2) tools-> mongo Browser -> I see that I have connection to my database -ok 3) (VOMongoRepository host: 'localhost' database: self databaseName) enableSingleton. 4) load ONLY my model classes which includes e.g. RKASystemMessage - load nothing else 5) Then I do RKASystemMessage selectAll (there is ONE system message in the mongo database) ==> this results in a non-responding image. 6) when debugging into the selectAll, I see, that VoyageMongo tries to add a collection (systemMessage), which is already there. in VOMongoRepositoryResolver>>collectionAt: aClass inDatabase: db the collections attribute is empty -> this seems to be the problem beause then it tries to do db addCollection: collectionName which leads to a "collection already exists" mongo reply If you have a mongo database running, you should be able to reproduce the problem. Regards Sabine -- View this message in context: http://forum.world.st/Problem-with-Mongo-on-Pharo5-collection-already-exist… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

5 14

Having a more robust PharoLauncher in low-bandwidth conditions
by Serge Stinckwich May 26, 2016

May 26, 2016

Dear all, in low-bandwidth countries, this is almost impossible to use PharoLauncher to dl new images from the CI. The problem is not really the speed (you just have to wait) but the robustness of the system. Most of the time, you PharoLauncher crash or you have an error like : "can't find EOCD position" before the end the of the download. I dunno exactly how PharoLauncher download images, but is it possible to think about a more robust way to dl images ? To be able to continue a dl if a network problem occurs (something like wget or curl) ? Thank you. -- Serge Stinckwich UCBN & UMI UMMISCO 209 (IRD/UPMC) Every DSL ends up being Smalltalk http://www.doesnotunderstand.org/

2 2

Monthly Pharo Newsletter
by marcus.denker＠inria.fr May 26, 2016

May 26, 2016

Hi, Some time ago we set up a very low traffic âPharo Newsletterâ Mailinglist. The idea is that this gets: -> a mail for the release -> *one* mail at the end of the month with 2-4 topics It seems to work well. We have until now send two monty mails and the mail for the Pharo5 release. If you want to be on it, here is a link to subscribe: http://pharo.us11.list-manage.com/subscribe?u=6f667565c2569234585a7be77&id=… If you follow all blogs, twitter + read all mails, there might not be anything new, but as things get even hard to follow for me it might be a good way to keep up with the most important things happening. And: if you have an idea for content (e.g. highlighting a project or a success story), please get in touch! Marcus

1 0

Lockup when inspecting Text
by Alistair Grant May 25, 2016

May 25, 2016

Hi All, I've got a Text object which I can inspect the string or the runs, but when I attempt to inspect the text object itself Pharo goes into a CPU loop and becomes unresponsive. I can't interrupt the display (Ctrl-.). I've attempted to step through the code to find the problem, however Pharo is going into a CPU loop when returning from GLMMorphicPageRenderer>>render:. I've included the stack trace leading to #render below. At the moment I'm struggling for ideas on how to track this down. Any suggestions? Thanks! Alistair The stack trace just before returning from #render: is: GLMMorphicPagerRenderer>>render: GLMMorphicPagerRenderer class(GLMMorphicWidgetRenderer class)>>render:from: GLMMorphicRenderer>>renderPager: GLMPager>>renderGlamorouslyOn: GLMMorphicRenderer(GLMRenderer)>>render: GLMMorphicTabbedRenderer(GLMMorphicWidgetRenderer)>>renderObject: GLMMorphicTabbedRenderer(GLMMorphicWidgetRenderer)>>renderWithTitleOrNil: GLMMorphicTabbedRenderer>>render: GLMMorphicTabbedRenderer class(GLMMorphicWidgetRenderer class)>>render:from: GLMMorphicRenderer>>renderTabbedCompositePresentation: GLMTabbedArrangement>>renderGlamorouslyOn: GTInspector(GLMCompositePresentation)>>renderGlamorouslyOn: GLMMorphicRenderer(GLMRenderer)>>render: GLMMorphicWindowRenderer(GLMMorphicWidgetRenderer)>>renderObject: GLMMorphicWindowRenderer>>render: GLMMorphicWindowRenderer class(GLMMorphicWidgetRenderer class)>>render:from: GLMMorphicRenderer>>open: GTInspector(GLMCompositePresentation)>>openWith: GTInspector(GLMCompositePresentation)>>openOn:with: GTInspector(GLMCompositePresentation)>>openOn: GTInspector>>openOn: GTInspector class>>openOn: GTInspector class>>inspect: Text(Object)>>inspect ^^^^ This is where I'm attempting to inspect the object. OrderedCollection>>DoIt OpalCompiler>>evaluate RubSmalltalkEditor>>evaluate:andDo: RubSmalltalkEditor>>highlightEvaluateAndDo: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] in [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: RubEditingArea(RubAbstractTextArea)>>handleEdit: [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: WorldState>>runStepMethodsIn: WorldMorph>>runStepMethods WorldState>>doOneCycleNowFor: WorldState>>doOneCycleFor: WorldMorph>>doOneCycle [ [ World doOneCycle. Processor yield. false ] whileFalse: [ ] ] in MorphicUIManager>>spawnNewProcess [ self value. Processor terminateActive ] in BlockClosure>>newProcess

2 5

An Idea for a minimal self documented begineer friendly pharo image
by Dimitris Chloupis May 25, 2016

May 25, 2016

So I was reading the complains from Sven and got Inspiration from Torsten Pharo image and CUIs and made me wonder what if we had an image which has the least amount of libraries and every library inside it is full commented in class, package and method and even has tutorial using inside help tool. So I think I will give this project a try. I know there is a plan to make pharo image more modular, but modularity does not equal minimalism , simplicity and ease of use. I think I will follow the CUIs example and do the development via Github. But I am open to ideas and suggestions. My intention is to remove the excess fat, to make Pharo prettier (improve theme support and make available several themes ) and to have everything commented and self documented. Obviously this will be a long term project and in no way a walk in the park but I was looking for a nice project to name "Ephestos" :D seem as good as any

6 12