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The new PyWPS-4: your Python based WPS server (PyWPS project report)

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The new PyWPS-4: your Python based WPS server (PyWPS project report)
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PyWPS is an open source, light-weight, Python based, implementation of the OGC Web Processing Service (WPS) standard. It provides users with a relatively seamless environment where to code geo-spatial functions and models that are readily exposed to the Internet through the WWW. Initially started in 2006, PyWPS has been completely re-written for PyWPS-4 taking advantage of the state-of-the-art Python infrastructure in order to provide new and useful features. The current version 3 implements the WPS 1.0 standard almost entirely. The recent publication of WPS version 2.0 - which brings forth important new functionalities - is also prompting this re-structuring of the code for PyWPS-4. PyWPS offers a straightforward WPS development framework with the increasingly popular Python language. Python offers easy access to a vast array of code libraries that can be easily used in the processes, in particular those for geo-spatial data manipulation, e.g. GRASS, GDAL/OGR, Fiona, Shapely, etc., but also to statistics packages (e.g. rpy2 for R statistics) and data analysis tools (e.g. pandas). PyWPS offers storage mechanisms for process inputs and outputs and spawns processes to the background for asynchronous execution requests. Future goals of the project include automatic publication of geo-spatial results through a WFS/WCS server such as MapServer and Geoserver and support for Transactional WPS with a process scheduler. The authors present general project news like to on going OSGeo incubation and the new Project Steering Committee as well as the current state of PyWPS, and show demonstrations how these services are currently being provided.
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morning everybody my name is John contributes the original presentation was announced by which the who here with me as well as part of a member of the producing committee on development the and also we have here shortages or Jesus if you all know was also a member of the development team and missing join us here in this room we have for people here at this conference and I would like to present you news and height
of the theUS project
probably you or some of you might already heard about it all this but by the previous is a implementation of
OGC Web Processing Service somewhere on the server-side using softly Python program it's quite rich and quite sure already or we would like to quote question and it's across all the tools which are available in a pipeline for geospatial processes for operations that would later be managed to which is recently despite appears or for this is not probably or you have some expectations so those are the expectations not uh able to fulfill its not complicated there's no client for oblivious strategy for clients have to bring to QG for example it has small graphical user interface were inspired by maternal by the way processes that some practices proposes but that a no processes so he will be asking can do it by the european buffer yes you can but if you questions sounds like is there no it isn't but briefly interaction so he's see processing so as you would probably heard already and you will probably hear at least 3 times during this session
is a standard for remote geospatial processing and somehow couples with other and old of US Open but services produced by what he sees IWF as sort of the CS and there are 3 basic requests the first one ordered all you always get capabilities which his the metadata like and there is a simple describe process request which gives you detailed metadata for all the inputs and outputs for the particle process and of course so that client can prepare request blasted was which is called execute that means visibility server execute that was supposed to execute a process the data and we regret according to the law of 3 basic input and output classes so called literally just which is usually taxing number amounts of complex data which is usually something just be they come back to rest of data and moaning they thought them referring to older version 1 0 some continuity of the on the tools usually claimed that can be a little no changes of generally again but only because they thought I general much used widely in the rest of the and thank this has somehow you geospatial acceptable
some operations this is how it works in practice so all
we have this server there's a lot of gradient ascent 1 and
and a survey are in our case and processes deployed and the response communicates to the outside world Internet using the processing services capabilities is persistent execute and the data when down process and basically transfer of transferring Data talking to information what
was adopted in a practical way is communication research it French to data referenced has to make sure that the data are located in not too big to deform of responses so it creates kind of container for a process instance there we we support arrears and the principal just management like for communication and reporting that process is going and looking at the need some data storage in order to start a final final outputs of the charges against that can be arrested following profile could be pretty clear to store it somewhere so we have to implement some sort of mechanism and have there's some clients modification of such supporting down to the yet to kind of course how process is going on in the process as I mentioned you would like to point out the major approaches produce matrices started 10 years ago and was 1st presented and 40 out of the 6 the first one in originally it was found the scholarship of German foundation for environments is there somebody from the view well think you 1 more time and our yeah there is the preservation
6 that really sort of variance during the next 3 or
4 years and the project for school at devil that was processed class use we the instru cost-of-living we try to improve it on time and the last symbol versions already shown on the 3 is it with us still today lost or today 2 years and now the have drink 2 year to 11 2011 the truth is the 1 who as written in the previous who book just published our thanks to the next floor project and it introduces basically the shown you will be able to commentation to solve our presents the oblivious implementation and also it introduces a very practical example using soul and also in the interface using stuff and novel full management system and sort of presentation from Georgia history and present you Ukraine when using graphical user interface like you you would be for example and you just processing will you could change processes 1 after another until you go to the final result it seems that is a there are just before it was accepted in other industry and academia and the of mentions that insensitive publications already the well the attendance of close friends and these outputs of the time thanks to to it is a constant for a projected as far as the number of correctly and reorganize the just the previous work showed that's Alexandra Institute of Science and Technology and started the current completely new version which we would like to write from scratch by the use for and 1 of the discussions the reader there was but it move from the GNU GPL license more fruity MIT and he applied to be as for the newest you're projecting during the
last year the so the biggest student from Google Summer of Code student originally was working at least and it was a successful Google Summer of Code project and also bring great known as the likelihood of Newman's work uh for the review pipe be assessed providers was helping us all these pictures 1 last so he not just Mitragotri source of doing things here consolidated do recommendation of that size we got new anywhere and and we would like to move to torus by the UPS for the user this summer I still hope to make it this summer at the company was completely new we had our 1st by the obvious for workshops and you may be there and uh this was for him that was the 1st thing that we used for the so what is the 4th version of our 1st line we started it as as I said it's a 10 years old project and so another so you you very high in unified been binding squares of the projects the data for well similar loans and 1st to mention the sound itself and we use the fact that a license and that of what it's really implication is passed on to processes that technologies and label and some it's 1 of them of course foster and facts so it W is interface you want to the other the topic of multiple somehow and so on and so all our 1
of the features we wanted to and introduce is the data validation for the current stabilization there's like no delineation whatever comes in you can proceed with your tools it's probably will be working on so this will be didn't check for the data from 1 which comes just from now we implemented for reliable approach particularly mentioned the 1st 1 is like a lot of this normalization and a 2nd the well let alone a simple addition because justice for the time and so all spherical iteration which those although don't that they also is in dual and change for data for what face and defines the correlation which uses the examples he sold it gives you many possibilities how to write an ontology o inputs from from like behave to your way to behaves diverse trait values and examined them and so on and the order of rituals of all the tools for searching for introducing GMM joke with of course data you you was the title the Suzuki Bryant jaw designed around find lighting functions of course for as soon as file there is little asking strides or forward UGC use Jesus here for example but we tried to go around with the biggest and those with the we are talking about this
is called the memorizing because sigh well you have to make sure that the WTPs server it is accused Jože requests concurrently somehow i'd in ideal case it would be total total is insulated of environments and there will be no not don't during the possibility of you know sharing resources for data so that's 1 process will arrive today some of the other 1 of 4 point of you 3 and still affordable P for the city created from a file of so temporarily directors sufferers deleted and eluded us down and after there are removed 4 by the abuse for really or exchangeable safer approach in the crew containers program for the process is not implemented yet and your your IP looking for for Kulick across in this case yeah and our the above method your way of obstacles process execution 10 using more the processing module is of course fork so it should example on Windows tools should should better and we our users not database for walking home and processes are running and having a bigger picture so this enables us for future task to student processes somehow and this is the start of the implementation of the previous to standard out 1 of the features is that you you can configure the number of processors running can impact in the time but also another number of waiting processes so the size of the queue which always and there is a useful on the on the on the computer so it can be and practical that means it's you can have like 2 or 3 3 processes running in parallel or another filter waiting in queue and after after is the sum of respondents server is an exception report future work of course you focus on WP has 2 features we have to improve the circuitous route security is 1 of the key features we always
keep in mind and site of the most of that into that interface for processes also somehow already addressed by our Google Summer of Code students such as and and it's looks pretty good it builds on top of more SAP of by the PNC the yeah and of course for interoperability is 1 of the key features this is about the
administration that the administration interface trust based on the REST interface for part of UPS so there is a list of running processes which that use and cost and messages can resume the 1 whose poles or stop at for example and now here you can have more metadata to the public was during
questions you so the applied to West you right to land 15 this the process was is 0 by providers and he made it was it produced civilizations the origins of I reorganized the produced commit from which currently has 5 members and there's only 1 addressee year the conference and the producing structural led Sundararajan reschedule culture review and so on we are trying to have monthly meetings on IRC or face to face lecture to conference the community is organized as you around a mailinglist called by grouping is that there have also the 5 members slightly and you'll hang around sometimes although usually attitude by whom additional for you know or data differ on it's slide by pianist and of course you here at conferences called constraints but usually can get over
example of approach so what is a going thing to do is to from good how and try to run a set up by and then we have set up for you whenever something we call might used them all and this is the place where all this is also for the 1st structure looks like this there is simply a protest directories but all the processes and a configuration file which should be easy to to understand and around this is all the purchase process will clients you should be familiar so familiar with it if you're we're using the old version wanted us to define a new class based on the process plus there's a list of inputs in other words in all cases is a complex inputs and list of future of alterations in all
this is just 1 maternal pulled and there's a handler function Hendler is the function of just doing something in our case this is the implementation of transformation right using called you out of so by the very
fast because this is fast
is they have a bike and all of this by this is my this is the reason why so everybody but is a by could be different but still it's a
bike bikes can be a lot it can also stop by can be small but they
can be cheaper and they can be pretty expensive to they can be very
simple and they can be very complex to but this is
what and there are constraints the versatility of part of loop yes it can be whatever you want and it's very easy to use you can fix them on the street like I did 3 days ago we just need to panic thank you of something consists anyone have any questions yeah no really basic questions saying on the news study he has come we part the user essentially exploiting any pattern function is that correct but it's not the yeah there is also an it's
poses basic and applied problems this
anything which you can bind to tighten it can be exposed to that there also we have bindings for already that creates a temporary location of for and don't through or you can use the shield or had intelligent like inventory prior which presented and other what possibilities of what the process that affects the appointment the field research was an as was but I could I don't think you know that was initially in 1 of the slides you mentioned about the US joke of what is going to and usable for using did their history since awarded because I imagine you're expecting the processor itself is broader as and and then we are it is supporting a very oblivious to involve the candidate entities that in that direction of 0 what is that the support of governments and by the way it's a little too consists I don't know why we are thinking about it if you if you imagine a server hundreds of processes will be running in parallel did tell radically equal to the quote congruent each other like writing teachers data for any reason could be a chance usually have it could be someone were doing something bad on the surface of the for each thing that do could be doing a whole week containerized the process instance and in a way that it would have been kind of feeling rather save is what is thrown in separated simply environment so it would be safer hopefully and we don't know how we implemented in practice in practice in student and I haven't I I know that you have conditioning at said but I was wondering how to be implemented in terms of a previously as images of support because this is in this and upper body and in this novel so as not being how you can do there is a concept in in the U. of solution within written but not things videos maybe was control something like that just a web of data on this that we we don't intend to integrate fragment of document that would be a this is just about implementation about what is going on in the background so actually for you the user or the person that is coding and you process for by the OPS nothing changes OK you use the by the gets API as before but the things in the background run in a safer way that's basically the long of the non-monotone the goal is that human code process as before nothing changes for you you that process go that you use you know just focus on geospatial operations that traditional geospatial libraries on linking fighting to whatever ends behind in the background but in the US takes care of that and creates wherever kind of continue rising infrastructure to guarantee that the process is completely insulated from the rest of this is that the ultimate goal the reason that the government yeah this we don't know exactly and maybe you can give us some suggestions and amazing list some your other OK taking about the things that becomes we have another talking about it in it's