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Re: Communication between different images

by Gabriel Cotelli

If you want to use Rabbit you can also take a look at Ansible <https://github.com/ba-st/Ansible>for connecting using the protocol instead of STOMP. On Tue, Jun 29, 2021 at 3:11 PM Esteban Maringolo <emaringolo(a)gmail.com> wrote: > As far as I understand, ZeroMQ does not require a broker to perform > the communication between publishers and subscribers, I don't know how > that is implemented (what do they connect to? how each client > discovers each other?). > > I already got MQTT running, It's not completely clear to me how the > QoS setting works (atLeastOnce, exactlyOnce, atMostOnce), I don't > remember using that setting in Java (it probably had a sensible > default). > > Regards! > > > Esteban A. Maringolo > > On Tue, Jun 29, 2021 at 2:45 PM Jesus Mari Aguirre > <jmariaguirre(a)gmail.com> wrote: > > > > Maybe ZeroMQ fits you, but unlucky is not documented and there are only > a few examples. I use ir in my jupyter kernel. You can install my port to > pharo64 uFFI doing: > > > > Metacello new > > baseline: 'JupyterTalk'; > > repository: 'github://jmari/JupyterTalk:master/repository'; > > load:'zmq' > > > > But it needs ZeroMQ previously installed on your system. > > It was ported from http://smalltalkhub.com/#!/~panuw/zeromq now it is > at: https://github.com/dellani/zeroMQ but I'm not sure if the original > repo works on newer Pharos....I had no time to contact the original author > to join both repos... > > > > > > > > El mar, 29 jun 2021 a las 4:56, Esteban Maringolo (<emaringolo(a)gmail.com>) > escribiÃ³: > >> > >> Hi, > >> > >> I'm rearchitecting a web app to perform updates only when necessary > >> (instead of computing them all the time) on each request, I can have a > >> global announcer and subscribers to know when to update within an > >> image, but is there a way to have something like that but for > >> inter-image coordination? > >> > >> I'd only need to communicate the id and the class name (or a similar > >> identifier), so on other images they'll update accordingly, and if > >> there is an update in one image, it will notify the other images. The > >> common data is on the database, so this is just to avoid re-reading a > >> lot of things. > >> > >> Is a message queue a good fit for this? Pub/Sub? > >> What is available in Pharo that works without having to set up a lot of > things? > >> > >> Thanks! > >> > >> Esteban A. Maringolo >

June 29, 2021

Re: Communication between different images

by Esteban Maringolo

As far as I understand, ZeroMQ does not require a broker to perform the communication between publishers and subscribers, I don't know how that is implemented (what do they connect to? how each client discovers each other?). I already got MQTT running, It's not completely clear to me how the QoS setting works (atLeastOnce, exactlyOnce, atMostOnce), I don't remember using that setting in Java (it probably had a sensible default). Regards! Esteban A. Maringolo On Tue, Jun 29, 2021 at 2:45 PM Jesus Mari Aguirre <jmariaguirre(a)gmail.com> wrote: > > Maybe ZeroMQ fits you, but unlucky is not documented and there are only a few examples. I use ir in my jupyter kernel. You can install my port to pharo64 uFFI doing: > > Metacello new > baseline: 'JupyterTalk'; > repository: 'github://jmari/JupyterTalk:master/repository'; > load:'zmq' > > But it needs ZeroMQ previously installed on your system. > It was ported from http://smalltalkhub.com/#!/~panuw/zeromq now it is at: https://github.com/dellani/zeroMQ but I'm not sure if the original repo works on newer Pharos....I had no time to contact the original author to join both repos... > > > > El mar, 29 jun 2021 a las 4:56, Esteban Maringolo (<emaringolo(a)gmail.com>) escribiÃ³: >> >> Hi, >> >> I'm rearchitecting a web app to perform updates only when necessary >> (instead of computing them all the time) on each request, I can have a >> global announcer and subscribers to know when to update within an >> image, but is there a way to have something like that but for >> inter-image coordination? >> >> I'd only need to communicate the id and the class name (or a similar >> identifier), so on other images they'll update accordingly, and if >> there is an update in one image, it will notify the other images. The >> common data is on the database, so this is just to avoid re-reading a >> lot of things. >> >> Is a message queue a good fit for this? Pub/Sub? >> What is available in Pharo that works without having to set up a lot of things? >> >> Thanks! >> >> Esteban A. Maringolo

June 29, 2021

Re: Communication between different images

by Jesus Mari Aguirre

Maybe ZeroMQ fits you, but unlucky is not documented and there are only a few examples. I use ir in my jupyter kernel. You can install my port to pharo64 uFFI doing: Metacello new baseline: 'JupyterTalk'; repository: 'github://jmari/JupyterTalk:master/repository'; load:'zmq' But it needs ZeroMQ previously installed on your system. It was ported from http://smalltalkhub.com/#!/~panuw/zeromq now it is at: https://github.com/dellani/zeroMQ but I'm not sure if the original repo works on newer Pharos....I had no time to contact the original author to join both repos... El mar, 29 jun 2021 a las 4:56, Esteban Maringolo (<emaringolo(a)gmail.com>) escribiÃ³: > Hi, > > I'm rearchitecting a web app to perform updates only when necessary > (instead of computing them all the time) on each request, I can have a > global announcer and subscribers to know when to update within an > image, but is there a way to have something like that but for > inter-image coordination? > > I'd only need to communicate the id and the class name (or a similar > identifier), so on other images they'll update accordingly, and if > there is an update in one image, it will notify the other images. The > common data is on the database, so this is just to avoid re-reading a > lot of things. > > Is a message queue a good fit for this? Pub/Sub? > What is available in Pharo that works without having to set up a lot of > things? > > Thanks! > > Esteban A. Maringolo >

June 29, 2021

Re: Fwd: [vwnc] Exception in Regex11 1.4.6

by Sebastian Jordan

No problem Steffen. Have a nice day too! Sebastian ________________________________ De : Steffen MÃ¤rcker <merkste(a)web.de> EnvoyÃ© : mardi 29 juin 2021 Ã 18:27 Ã : Any question about pharo is welcome Objet : [Pharo-users] Re: Fwd: [vwnc] Exception in Regex11 1.4.6 Thanks Sebastian, that's exactly what I was looking for. I vaguely remembered that such a site exits. =) Have a nice day! Steffen Sebastian Jordan schrieb am Dienstag, 29. Juni 2021 18:23:23 (+02:00): Here https://github.com/pharo-project/pharo/wiki/Contribute-a-fix-to-Pharo<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com…> Sebastian ________________________________ From: Steffen MÃ¤rcker <merkste(a)web.de> Sent: Tuesday, June 29, 2021 6:13:00 PM To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> Subject: [Pharo-users] Re: Fwd: [vwnc] Exception in Regex11 1.4.6 Dear all! I just checked and found that Regex in Pharo is indeed based on Regex11. It suffers from the same bug as the original. I'd like to bring the fix to Pharo. As a first-timer, where can I read about the procedure of contributing code? Kind regards, Steffen Steffen MÃ¤rcker schrieb am Donnerstag, 24. Juni 2021 18:52:16 (+02:00): Hi! Does Pharo use the Regex11 package? If yes, has it already diverged from the version shipped with VisualWorks? The reason I am asking is that I just pushed an update to the public store. It addresses a bug that prevented $[ to be used in a character class. For details, see the excerpt below. Furthermore, you might have an opinion on allowing more escape sequences in character classes, don't you? Kind regards, Steffen ----- Weitergeleitete Nachricht ----- Von: Steffen MÃ¤rcker <merkste(a)web.de> An: 'VWNC' <vwnc(a)cs.uiuc.edu> Betreff: Re: [vwnc] Exception in Regex11 1.4.6 Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (MitteleuropÃ¤ische Sommerzeit) Hi! I just published Regex11 version 1.4.7 with the following changes: 1. Fix: Character sets could not contain an opening bracket $[. 2. Fix: Character sets could not contain the characters '[:', e.g. as in '[[:something]' asRegex. I also provided additional tests for the improved functionality. I might tidy the code a bit later in a minor version bump. Just to note that Regex11 uses [[:xxx:]] as a special syntax, which might interfere with attempts to allow [[] and []]. Indeed. If I did no mistake, the new version does not break this. I agree with the idea to allow backslash escaping in character classes too, with the default being that backslash followed by any character is parsed as that character. I also like the idea of allowing more backslash escaping in character classes. However, I still have the bad feeling that this might change the semantics of existing code. Hence, I refrained from implementing this right away until I am more confident that this does not break other peoples stuff. Currently only a few explicitly defined backslash escapes are recognized, forcing the user to remember whether a given character can be used as-is in a given context, or must be escaped. A couple of gotchas (probably not applicable in a character set?): \< an empty string at the beginning of a word \> an empty string at the end of a word Thanks, I'll keep them in mind and consider them when I decide to implement the changes. OT: I also noticed that repetition, e.g. '.{5}' behaves strange. For instance, '.{{5}}' should match 'a{{{{{}' but it doesn't. Has anyone an opinion on that one? Best regards, Steffen -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter. -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter.

June 29, 2021

Re: Fwd: [vwnc] Exception in Regex11 1.4.6

by Steffen MÃ¤rcker

Thanks Sebastian, that's exactly what I was looking for. I vaguely remembered that such a site exits. =) Have a nice day! Steffen Sebastian Jordan schrieb am Dienstag, 29. Juni 2021 18:23:23 (+02:00): Here https://github.com/pharo-project/pharo/wiki/Contribute-a-fix-to-Pharo Sebastian From: Steffen MÃ¤rcker <merkste(a)web.de> Sent: Tuesday, June 29, 2021 6:13:00 PM To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> Subject: [Pharo-users] Re: Fwd: [vwnc] Exception in Regex11 1.4.6 Dear all! I just checked and found that Regex in Pharo is indeed based on Regex11. It suffers from the same bug as the original. I'd like to bring the fix to Pharo. As a first-timer, where can I read about the procedure of contributing code? Kind regards, Steffen Steffen MÃ¤rcker schrieb am Donnerstag, 24. Juni 2021 18:52:16 (+02:00): Hi! Does Pharo use the Regex11 package? If yes, has it already diverged from the version shipped with VisualWorks? The reason I am asking is that I just pushed an update to the public store. It addresses a bug that prevented $[ to be used in a character class. For details, see the excerpt below. Furthermore, you might have an opinion on allowing more escape sequences in character classes, don't you? Kind regards, Steffen ----- Weitergeleitete Nachricht ----- Von: Steffen MÃ¤rcker <merkste(a)web.de> An: 'VWNC' <vwnc(a)cs.uiuc.edu> Betreff: Re: [vwnc] Exception in Regex11 1.4.6 Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (MitteleuropÃ¤ische Sommerzeit) Hi! I just published Regex11 version 1.4.7 with the following changes: 1. Fix: Character sets could not contain an opening bracket $[. 2. Fix: Character sets could not contain the characters '[:', e.g. as in '[[:something]' asRegex. I also provided additional tests for the improved functionality. I might tidy the code a bit later in a minor version bump. Just to note that Regex11 uses [[:xxx:]] as a special syntax, which might interfere with attempts to allow [[] and []]. Indeed. If I did no mistake, the new version does not break this. I agree with the idea to allow backslash escaping in character classes too, with the default being that backslash followed by any character is parsed as that character. I also like the idea of allowing more backslash escaping in character classes. However, I still have the bad feeling that this might change the semantics of existing code. Hence, I refrained from implementing this right away until I am more confident that this does not break other peoples stuff. Currently only a few explicitly defined backslash escapes are recognized, forcing the user to remember whether a given character can be used as-is in a given context, or must be escaped. A couple of gotchas (probably not applicable in a character set?): \< an empty string at the beginning of a word \> an empty string at the end of a word Thanks, I'll keep them in mind and consider them when I decide to implement the changes. OT: I also noticed that repetition, e.g. '.{5}' behaves strange. For instance, '.{{5}}' should match 'a{{{{{}' but it doesn't. Has anyone an opinion on that one? Best regards, Steffen -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter. -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter.

June 29, 2021

Re: Fwd: [vwnc] Exception in Regex11 1.4.6

by Sebastian Jordan

Here https://github.com/pharo-project/pharo/wiki/Contribute-a-fix-to-Pharo Sebastian ________________________________ From: Steffen MÃ¤rcker <merkste(a)web.de> Sent: Tuesday, June 29, 2021 6:13:00 PM To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> Subject: [Pharo-users] Re: Fwd: [vwnc] Exception in Regex11 1.4.6 Dear all! I just checked and found that Regex in Pharo is indeed based on Regex11. It suffers from the same bug as the original. I'd like to bring the fix to Pharo. As a first-timer, where can I read about the procedure of contributing code? Kind regards, Steffen Steffen MÃ¤rcker schrieb am Donnerstag, 24. Juni 2021 18:52:16 (+02:00): Hi! Does Pharo use the Regex11 package? If yes, has it already diverged from the version shipped with VisualWorks? The reason I am asking is that I just pushed an update to the public store. It addresses a bug that prevented $[ to be used in a character class. For details, see the excerpt below. Furthermore, you might have an opinion on allowing more escape sequences in character classes, don't you? Kind regards, Steffen ----- Weitergeleitete Nachricht ----- Von: Steffen MÃ¤rcker <merkste(a)web.de> An: 'VWNC' <vwnc(a)cs.uiuc.edu> Betreff: Re: [vwnc] Exception in Regex11 1.4.6 Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (MitteleuropÃ¤ische Sommerzeit) Hi! I just published Regex11 version 1.4.7 with the following changes: 1. Fix: Character sets could not contain an opening bracket $[. 2. Fix: Character sets could not contain the characters '[:', e.g. as in '[[:something]' asRegex. I also provided additional tests for the improved functionality. I might tidy the code a bit later in a minor version bump. Just to note that Regex11 uses [[:xxx:]] as a special syntax, which might interfere with attempts to allow [[] and []]. Indeed. If I did no mistake, the new version does not break this. I agree with the idea to allow backslash escaping in character classes too, with the default being that backslash followed by any character is parsed as that character. I also like the idea of allowing more backslash escaping in character classes. However, I still have the bad feeling that this might change the semantics of existing code. Hence, I refrained from implementing this right away until I am more confident that this does not break other peoples stuff. Currently only a few explicitly defined backslash escapes are recognized, forcing the user to remember whether a given character can be used as-is in a given context, or must be escaped. A couple of gotchas (probably not applicable in a character set?): \< an empty string at the beginning of a word \> an empty string at the end of a word Thanks, I'll keep them in mind and consider them when I decide to implement the changes. OT: I also noticed that repetition, e.g. '.{5}' behaves strange. For instance, '.{{5}}' should match 'a{{{{{}' but it doesn't. Has anyone an opinion on that one? Best regards, Steffen -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter.

June 29, 2021

Re: Fwd: [vwnc] Exception in Regex11 1.4.6

by Steffen MÃ¤rcker

Dear all! I just checked and found that Regex in Pharo is indeed based on Regex11. It suffers from the same bug as the original. I'd like to bring the fix to Pharo. As a first-timer, where can I read about the procedure of contributing code? Kind regards, Steffen Steffen MÃ¤rcker schrieb am Donnerstag, 24. Juni 2021 18:52:16 (+02:00): Hi! Does Pharo use the Regex11 package? If yes, has it already diverged from the version shipped with VisualWorks? The reason I am asking is that I just pushed an update to the public store. It addresses a bug that prevented $[ to be used in a character class. For details, see the excerpt below. Furthermore, you might have an opinion on allowing more escape sequences in character classes, don't you? Kind regards, Steffen ----- Weitergeleitete Nachricht ----- Von: Steffen MÃ¤rcker <merkste(a)web.de> An: 'VWNC' <vwnc(a)cs.uiuc.edu> Betreff: Re: [vwnc] Exception in Regex11 1.4.6 Datum: Thu Jun 24 2021 18:47:01 GMT+0200 (MitteleuropÃ¤ische Sommerzeit) Hi! I just published Regex11 version 1.4.7 with the following changes: 1. Fix: Character sets could not contain an opening bracket $[. 2. Fix: Character sets could not contain the characters '[:', e.g. as in '[[:something]' asRegex. I also provided additional tests for the improved functionality. I might tidy the code a bit later in a minor version bump. Just to note that Regex11 uses [[:xxx:]] as a special syntax, which might interfere with attempts to allow [[] and []]. Indeed. If I did no mistake, the new version does not break this. I agree with the idea to allow backslash escaping in character classes too, with the default being that backslash followed by any character is parsed as that character. I also like the idea of allowing more backslash escaping in character classes. However, I still have the bad feeling that this might change the semantics of existing code. Hence, I refrained from implementing this right away until I am more confident that this does not break other peoples stuff. Currently only a few explicitly defined backslash escapes are recognized, forcing the user to remember whether a given character can be used as-is in a given context, or must be escaped. A couple of gotchas (probably not applicable in a character set?): \< an empty string at the beginning of a word \> an empty string at the end of a word Thanks, I'll keep them in mind and consider them when I decide to implement the changes. OT: I also noticed that repetition, e.g. '.{5}' behaves strange. For instance, '.{{5}}' should match 'a{{{{{}' but it doesn't. Has anyone an opinion on that one? Best regards, Steffen -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter.

June 29, 2021

Re: Communication between different images

by Sven Van Caekenberghe

> On 29 Jun 2021, at 15:50, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Hi Sven, > > I thought about both RabittMQ and MQTT too. > > For RabittMQ I noticed you provide a docker config to get a container > running quickly. That was done for GitHub action testing, by Santiago, you could indeed (re)use part of that. > What is the easy-go solution for MQTT? Installing mosquitto is very simple, just apt install. See also the GitHub action. There is much to say about both, you can find lots of information on the internet on how to configure these services, getting started is quite easy. > Regards! > > Esteban A. Maringolo > > On Tue, Jun 29, 2021 at 3:15 AM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >> >> Hi Esteban, >> >>> On 29 Jun 2021, at 04:55, Esteban Maringolo <emaringolo(a)gmail.com> wrote: >>> >>> Hi, >>> >>> I'm rearchitecting a web app to perform updates only when necessary >>> (instead of computing them all the time) on each request, I can have a >>> global announcer and subscribers to know when to update within an >>> image, but is there a way to have something like that but for >>> inter-image coordination? >>> >>> I'd only need to communicate the id and the class name (or a similar >>> identifier), so on other images they'll update accordingly, and if >>> there is an update in one image, it will notify the other images. The >>> common data is on the database, so this is just to avoid re-reading a >>> lot of things. >>> >>> Is a message queue a good fit for this? Pub/Sub? >>> What is available in Pharo that works without having to set up a lot of things? >>> >>> Thanks! >>> >>> Esteban A. Maringolo >> >> RabbitMQ (for which there is the STOMP client 'STAMP' https://github.com/svenvc/stamp) is one option, but it is a bit more complex. >> >> I guess Redis would work too (https://medium.com/concerning-pharo/quick-write-me-a-redis-client-5fbe4ddfb…) >> >> More recently I have been using MQTT (with the client https://github.com/svenvc/mqtt) which is much simpler. >> >> You post a message on a topic and have one or more listeners see it. You can even arrange for the broker to keep the messages you miss (within a reasonable window) - which is very nice for all kinds of reasons (especially operational). I have a system in production that uses this mechanism to coordinate different images (and handle ingress of data) for more than a year now. >> >> Sven

June 29, 2021

Re: Communication between different images

by Esteban Maringolo

Hi Sven, I thought about both RabittMQ and MQTT too. For RabittMQ I noticed you provide a docker config to get a container running quickly. What is the easy-go solution for MQTT? Regards! Esteban A. Maringolo On Tue, Jun 29, 2021 at 3:15 AM Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Hi Esteban, > > > On 29 Jun 2021, at 04:55, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > > > Hi, > > > > I'm rearchitecting a web app to perform updates only when necessary > > (instead of computing them all the time) on each request, I can have a > > global announcer and subscribers to know when to update within an > > image, but is there a way to have something like that but for > > inter-image coordination? > > > > I'd only need to communicate the id and the class name (or a similar > > identifier), so on other images they'll update accordingly, and if > > there is an update in one image, it will notify the other images. The > > common data is on the database, so this is just to avoid re-reading a > > lot of things. > > > > Is a message queue a good fit for this? Pub/Sub? > > What is available in Pharo that works without having to set up a lot of things? > > > > Thanks! > > > > Esteban A. Maringolo > > RabbitMQ (for which there is the STOMP client 'STAMP' https://github.com/svenvc/stamp) is one option, but it is a bit more complex. > > I guess Redis would work too (https://medium.com/concerning-pharo/quick-write-me-a-redis-client-5fbe4ddfb…) > > More recently I have been using MQTT (with the client https://github.com/svenvc/mqtt) which is much simpler. > > You post a message on a topic and have one or more listeners see it. You can even arrange for the broker to keep the messages you miss (within a reasonable window) - which is very nice for all kinds of reasons (especially operational). I have a system in production that uses this mechanism to coordinate different images (and handle ingress of data) for more than a year now. > > Sven

June 29, 2021

SerialPort hangs image in combination with Raspberry Pico (Windows)

by Rob van Lopik

I have the following strange situation, where SerialPort>>nextPutAll: hangs when sending to a COM port that is (USB) connected to a Raspberry Pico (RP2040). The Pico contains a simple program (sketch) that echoes all input on it USB-serial port. This is written with the Arduino IDE. The echo function works OK with the Arduino Serial monitor, PuTTY and a simple Python progran. When I put the same echo program on another Arduino board (e.g. Uno or Adafruit Feather) Pharo's SerialPort does work fine. I have tested with 32 and 64 bits versions of Pharo 5, 7 and 8. All on Windows; on Raspbian there is no problem. So, there is something peculiar with the combination of the SerialPlugin and the USBserial implementation on the Pico (which uses TinyUSB), but I am at a loss as to where to search. Maybe somebody has a hint. I have seen problems with the Serial Plugin in the past. I ran into this when developing a driver for the Raspberry Pico, where the Pico runs the picod daemon (http://abyz.me.uk/picod/index.html) This code is in https://github.com/robvanlopik/picod-pharo and does not work on Windows. Rob van Lopik

June 29, 2021