World: r3wp
[!REBOL3 Schemes] Implementors guide
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Graham 24-Jan-2010 [1800x2] | so, it's system/contexts/user/user ... we can store a user object here? |
And set-net will store the data here too? | |
BrianH 24-Jan-2010 [1802x3] | system/contexts/user is the script context. You can put whatever script-accessible words you want there. |
We are using modules and access functions like set-net instead of global options objects, for the most part. | |
The system structure of R3 is very different from R2. | |
Graham 24-Jan-2010 [1805] | I think we can work with everything being in system/contexts/user/user for the purposes of a scheme for the moment |
BrianH 24-Jan-2010 [1806] | Remember that 'user is a common script word, so that will be overwritten. Use module-local data, or port-specific data. |
Graham 24-Jan-2010 [1807] | Eh? |
BrianH 24-Jan-2010 [1808] | Certainly, set-net shouldn't set anything writeable any other way. |
Graham 24-Jan-2010 [1809] | Moving on .... an AWS:// scheme can certainly be derived from the http scheme |
BrianH 24-Jan-2010 [1810x2] | system/contexts/user is the shared "global" context for all user scripts (not modules), and that's why it's task-specific. |
Maarten did so for Qtask, so I assume that strategy for aws:// would work here. | |
Graham 24-Jan-2010 [1812] | Umm.. he rewrote the http scheme I think |
BrianH 24-Jan-2010 [1813] | Yeah. Which we need to do too. |
Graham 24-Jan-2010 [1814x2] | Eh? What's wrong with Gabriele's http scheme? |
Anyway, Maarten had to do all of this because he chose to use the REST method of interacting with aws. To it seems much simpler to use SOAP instead. | |
BrianH 24-Jan-2010 [1816x2] | Chunked encoding is broken, which is why the released version has been modded to use http 1.0; error handling is broken (the source of most chat errors); no server support; written for an older idea of R3 semantics. |
Our HTTP scheme should work with REST out-of-the-box too. | |
Graham 24-Jan-2010 [1818x2] | I haven't used the prot-http ... |
Is Gabriele ever coming back to work on any R3 stuff ? Or is he a permanent qtask person now? | |
BrianH 24-Jan-2010 [1820] | It's next on my list after 2.7.8 and R3 compressed modules/scripts. |
Graham 24-Jan-2010 [1821x2] | Yes, I'm sure it will work with REST ... it's just harder to maintain the aws interface each time they change their specifications |
So, I suspect it's easier to maintain using SOAP | |
BrianH 24-Jan-2010 [1823] | I don't use their services (yet) so I wouldn't know. |
Graham 24-Jan-2010 [1824x3] | Well I was reading their API again over the weekend on the plane :) |
The main issue is that SOAP has to be over https ... so have to use stunnel ... that is if i can get stunnel working under windows 7 | |
And if someone wants REST ... they can do it later on. | |
Pekr 24-Jan-2010 [1827] | I would like to ask about the inner workings of port actors. How is it done? Let's say you define 'read actor for port. Does it mean, that call to "read tcp://x.x.x.x" will then pass call to port 'read actor? |
Graham 24-Jan-2010 [1828] | read scheme:// means that you call the scheme's actor 'read |
Pekr 24-Jan-2010 [1829] | OK, but how does the native as 'read knows, what to do, if it is passed a port type? It is done somewhere in low level? In other words - which functions can be overriden that way? |
Graham 24-Jan-2010 [1830x9] | 'read checks to see if it is a port!, and then looks up the scheme |
I read this somewhere .... | |
Alas my index is worse than that for the r3 docs | |
I don't know what the possible actors are, but I think they're the ones related to series. | |
Maybe the way to find out is to create a dummy scheme and implement as many dummy actors you can think of and then test them.... | |
One of the issues with AWS is all the XML .. but I think we don't need a fancy XML parser .. .as it's pretty basic stuff. | |
Managed my first request to the Amazon SDB using the http scheme and SOAP | |
They say HTTPS is obligatory, but i used http and it was still accepted. | |
payload: create-sdb-message "ListDomains" listDomains 10 result: to-string write http://sdb.amazonaws.comcompose [ POST [ Content-Type: {text/xml; charset="utf-8"} SOAPaction: "ListDomains"] (payload) ] | |
Steeve 25-Jan-2010 [1839x2] | Possible actors are the functions accepting a port! as an input. |
(obviously...) | |
Graham 25-Jan-2010 [1841] | good point! |
Pekr 25-Jan-2010 [1842] | ah, thanks Steeve, that makes sense. It is nice that we can overload those functions .... |
Graham 25-Jan-2010 [1843x2] | A couple of prototype functions for Amazon SDB http://rebol.wik.is/Rebol3/AWS |
Successfully created a couple of domains, and then listed them. | |
Gregg 25-Jan-2010 [1845] | Nice Graham. |
Graham 25-Jan-2010 [1846x4] | SOAP looks much easier to implement compared with the tricky stuff you have to do with REST. |
I haven't looked at the other services for a while now, and don't think I ever looked at the SOAP api for S3, and SQS .. but I suspect it's very similar, and just point the URL to a different service | |
What would be nice would be a small tight library for dealing with basic XML | |
Not suggesting that anyone write an XSD parser! | |
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