- Pharo-users - lists.pharo.org

[ANN] ZnReadEvalPrintDelegate
by Sven Van Caekenberghe May 16, 2013

May 16, 2013

Hi, Here is a little tool that might be useful to some you. For others it might be a nice example. So you have your shiny Pharo server application running in the cloud. When something goes wrong, most of the time you will just restart, manually or automatically. But sometimes you wish you could interact with a running headless server image. Problem is, you can't out of the box. ZnReadEvalPrintDelegate is a simple tool that exports a REPL Web Service. Much like the emergency evaluator. Primitive but better than nothing. Install it on a port of your choice, running in a independent Zn HTTP server, bound to localhost only. ZnReadEvalPrintDelegate startInServerOn: 1701. There is only one API method: POST a plain/text Smalltalk expression to evaluate, get the result back. ZnClient new url: 'http://localhost:1701/repl'; contents: '42 factorial'; post. Here is an example terminal session (logged in to the server, not remote): A GET on the service /repl gives some help text $ curl http://localhost:1701/repl # Pharo Smalltalk REPL. POST expressions to evaluate # Here is one way (type ctrl-d to end input) curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl A POST with -d is good for short expressions $ curl -X POST -H'Content-Type:text/plain' -d '42 factorial' http://localhost:1701/repl 1405006117752879898543142606244511569936384000000000 For longer or multi line expressions you can read input from stdin and end with ctrl-d (copy the expression returned by the GET). Or you could send text files. $ curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl { (1 to: 10) sum. (1 to: 10) average } {55. (11/2)} There is error handling as well: $ curl -X POST -H'Content-Type:text/plain' --data-binary @- http://localhost:1701/repl 1 plus: 2 MessageNotUnderstood: SmallInteger>>plus: SmallInteger(Object)>>doesNotUnderstand: #plus: Receiver: 1 Arguments and temporary variables: aMessage: plus: 2 exception: MessageNotUnderstood: SmallInteger>>plus: resumeValue: nil Receiver's instance variables: 1 UndefinedObject>>DoIt Compiler>>evaluate:in:to:notifying:ifFail:logged: Compiler>>evaluate:in:to:notifying:ifFail: Compiler>>evaluate:in:to: ZnReadEvalPrintDelegate>>evaluate: in Block: [| result |... BlockClosure>>on:do: ZnReadEvalPrintDelegate>>evaluate: in Block: [:out | [| result |... String class(SequenceableCollection class)>>new:streamContents: WARNING: never open this service beyond your local network ! This service gives you absolute control over and access to everything in your image. For example, the following will kill your image: $ curl -X POST -H'Content-Type:text/plain' -d 'Smalltalk quitPrimitive' http://localhost:1701/repl All this in one class and a handful of methods. Enjoy, Sven PS1: Part of Zinc HTTP Components, in the bleedingEdge version. PS2: Of course, basic authentication or HTTPS can be added through simple Zn configuration. -- Sven Van Caekenberghe Proudly supporting Pharo http://pharo.org http://association.pharo.org http://consortium.pharo.org

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InputEventSensor and polling
by Eric Clack May 16, 2013

May 16, 2013

Hi all, I've been working on Phratch, a port of MIT Scratch to Pharo, mostly to learn Smalltalk and also because Scratch is a great learning environment and I can't bear to see it end up in Flash. So I've been digging about in the old code to fix bugs and I'm getting a sense that there's some conflict between the way the Scratch team got things working in Squeak, and the way the Pharo team things want things done. I must say I think the Pharo team have things right in their drive for a cleaner, simpler system, however that means I'm a bit stuck. See the attached image of my Scratch script. Here's where I am... 1. Keyboard events for 'When <key> pressed' HatBlockMorph (with then pen commands) work fine as these follow the regular Morphic event model 2. But 'if <key> pressed' operation (with the stamp command inside) doesn't work because it relies on polling the InputEventSensor, and I think this bit of this class doesn't work as I expect. My view right now is that for 2, I need to use some kind of polling, and InputEventSensor has methods such as keyboardPeek and peekKeyboardEvent that imply you can poll, but looking at the implementation, which uses WaitfreeQueue I can see that calling these methods results in events being consumed, hence my post to Stack Overflow... http://stackoverflow.com/questions/16395418/cant-peek-keyboard-events-multi… I've hacked around to come up with something that sort of works, outlined in this post: http://stackoverflow.com/questions/16495436/saving-modifications-to-existin… ...but I get the feeling I'm doing the wrong thing here, and that I should come up with a solution that better fits the 'Pharo way'. So, let me know what you think. I'm happy to provide more info and to research better solutions, let me know... Finally, apologies for the long post! Best regards, -Eric. -- Eric Clack ericclack(a)googlemail.com East Sussex, England.

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About the Mailinglist debacle...
by Marcus Denker May 16, 2013

May 16, 2013

Hello, So now that everything is workingâ¦ sorry for the mess. We should have left the gforge infrastructure the last time we had a multi-day problem, not wait till we get it again. I think this will be my new principle: second real problem -> I leave. No discussions. We already saw with the jenkins story just how deadly bad infrastructure is. So what happened was that last Tuesday, the lists (all lists of gforge) stopped delivering. Why is not clear, seemingly it was not gforge itself but the upstream servers did not deliver. Whatever. What is clear is that it was completely unclear how long this would take, and that we needed a solution after nearly a week of waiting. So we decided to move the lists. Of course with the old lists down, this was harder than normal (even involved parsing the html to get the subscribersâ¦) but that is not important. Now the problem its hat Mailman does not distinguish between people that unsubscribe, and those turning off delivery. So there where just a lot of people listed with "nomail (U)", What to do? It was clear that we can't just subscribe lots of people to a list that they *actively* unsubscribed. So the only option was to skip those by -> unsubscribing them from the old list -> then get the list of subscribers -> put that in the new list. The only people that will see a bad effect are those using e.g nabble to read the list. But those would see the new mails, too. The only problem they have is if the want to send. So not *that* of a big deal. It seems that we got quite some false positive subscribers anyway in the form of people who filtered the mails and then with the new list the filter did not work and they suddenly saw mails of a long forgotten list. We even had the case of people who where "nomail (U)", yet they did get mails delivered. How that can possibly work, I have no clue *at all*. What else is missing (and on my TODO since Sunday/Monday, sorry for not yet acting on it): -> lists.pharo.org has an empty page and needs to point to the list of the lists inttead -> the archive needs to be moved from the old jenkins. -> the (incomplete) archive of the new lists is not working since I put it as public. Soâ¦ maybe it would have been better to just wait until gforge works again and then moveâ¦ but it was just far too long already and not clear when it would be working again. Marcus

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a 'doesNotUnderstand' message that I do not understand...
by Alain Busser May 15, 2013

May 15, 2013

Hi all, Exploring the system browser (Pharo 2.0), I see that there exists a class called TextEditorDialogWindow; as this name sounds interesting to me, I want to test one, and I see that there is only one method in the category 'create': this method is called newTextEditorMorph. So, I send the message newTextEditorMorph to the class TextEditorDialogWindow, daring a: TextEditorDialogWindow newTextEditorMorph At the 'Do It', I get this error message: 'TextEditorDialogWindow class(Object) doesNotUnderstand: #newTextEditorMorph' That's what I don't understand: If the class has a method called this way, why does it not understand the corresponding message? What did I miss? Alain

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Zn maximumEntitySize
by Pierce Ng May 15, 2013

May 15, 2013

Hi, (Second try. Seems my first attempt went out at just around the time the previous list died.) I'm writing (what should become) a series of blog posts on fuzzing. My blog runs as a Zinc server delegate on Pharo. From source code, I see ZnMaximumEntitySize, ZnServer>>maximumEntitySize:, ZnConstants class>>defaultMaximumEntitySize, etc. Seems the setting doesn't? The following is my server: | s | s := ZnSingleThreadedServer on: 8082. s maximumEntitySize: 128. s delegate: (ZnValueDelegate with: [ :req | ZnResponse ok: (ZnEntity html: ZnConstants welcomePageHtml) ]). s logToTranscript. s start. I expected the following client to raise ZnEntityTooLarge, but it doesn't. Instead it works, and I see in the Transcript the request with all the $a in it. Am I reading the source wrong? ZnEasy get: ('http://127.0.0.1:8082/', (String new: 200 withAll: $a) asString) Incidentally, when I did the following on another machine, both client and server threw time-out exceptions: ZnEasy get: ('http://192.168.x.x:8082/', (String new: (16 * 1024 * 1024) withAll: $a) asString) -- Pierce Ng http://samadhiweb.com/blog/

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success story: NTed
by Norbert Hartl May 15, 2013

May 15, 2013

I think my last post of this message fell into the time the old mailing list dies. So here it is again --- We (@2denker in cooperation with a local university) built a monitoring tool for disaster scenario recovery rehearsals. Several times a year universities, red cross, THW und hospitals are planning a rehearsal together. For this an environment is prepared for a simulated disaster (car accidents, explosions in civil areas, â¦). The local environment is prepared to look real as well as film make-up artist prepare people for injuries (broken legs, open head, â¦). The rehearsal should improve the coordination of several hospitals, firemenâ¦as well as the quickest possible treatment for the injured. One important part of the rehearsal is monitoring of what happens. This is achieved by installing a local position system and using our tool. Every injured person gets a wireless tablet. On the tablet there are UI elements that indicate treatment done to them. Whenever a doctor comes visiting the injured person activates the corresponding UI button. The events are transmitted to a server and are prepared for another analysis software. The tablet enables the HQ to make contact to individual persons or groups. The tablet measures times of needed treatments and instructs the injured to be dead if measurements weren't taken in time. Technically it is done in smalltalk solo. The server is a pharo image. It has - web admin interface with complex forms for managing injuries, injured, groups, etc. For this we used seaside because it is best suited for this job. Forms are done with magritte, magritte-bootstrap. The interface also displays the live incoming events and other data - a static file server that delivers static resources to client tablets - a websocket connector that is used by the clients to connect to the server - a http handler to export data to other analysis tools The client is done with amber smalltalk. It - loads the web page containing amber from the server - connects back to the server - downloads a UI spec for the injured using the tablet to display personalized UI elements - stores events on the tablet in case the injured is offline - measures times to instruct the injured If you have any questions please don't hesitate to ask. Norbert

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Fwd: do:displayingProgress: Question/Problem
by Juan Ignacio Vaccarezza May 15, 2013

May 15, 2013

Hi all I detected a behavior and Im not sure how to classify it (most sure is ignorance :P). Maybe some one can explain me. Given the code: *Smalltalk allClasses do:[:aClass| (Delay forMilliseconds: 1) wait] displayingProgress:[:aClass| 'Processing ', aClass name].* (Which is the example on the Collection class) In 1.4 the result is a dialog that shows a progres bar titled with each classname In 2.0 the result is a dialog showing only a progress bar. Thanks in advance, Juan

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Old Malinglists: delivering slowly
by Marcus Denker May 15, 2013

May 15, 2013

Hi, So the old lists started to deliver the mails send over the last week slowly. I have put them on emergency moderation, so please use the new list to answer. Marcus

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please update your mail addresses
by Camillo Bruni May 14, 2013

May 14, 2013

pharo-users(a)lists.pharo.org

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Re: [Pharo-users] success story: NTed
by Paul Davidowitz May 14, 2013

May 14, 2013

Sounds most excellent! I do have some questions: 1) What datastore is used, both on the server as well as tablet ? 2) What is the OS of the tablet? 3) How smooth was the Amber development? Can you do remote debugging on the server? 4) How did you manage to convince the ones paying for the project, that it would be done in Smalltalk?! -Paul

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