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Opentree browsing and curation web site. For overarching or cross-repo concerns, please see the 'germinator' repo.
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QUESTION
I'm getting started with Haskell (from many years of C and c++) and have decided to attempt a small database project. I'm using a predefined binder library to a C database library (Database.kyotocabint). I'm struggling to get my head round how to do anything with the iterator interfaces due to the separation of effects when using a pre-defined method.
The toy demo to iterate over the data base and print it out (which works fine) is
...ANSWER
Answered 2021-Jun-30 at 12:16The kyotocabinet
library unfortunately does not seem to support your operation. Beyond iterate
, it should expose some similar operation which returns something more complex than IO ()
, say IO a
or IO [a]
while requiring a more complex visitor
function.
Still, since we work inside IO
, there is a workaround: we can exploit IORef
s and collect results. I want to stress, though, that this is not idiomatic code one would write in Haskell, but something one is forced to use because if the limitation of this library.
Anyway, the code would look something like this (untested):
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Download and unpack the source code version of web2py from http://www.web2py.com/examples/default/download MTH used version 2.4.2 of web2py NOTE: This version of web2py includes basic support for OAuth 2.0, but it needs a minor patch to support for login via the GitHub API v3. (The curation app uses GitHub for its datastore and attribution. The tree browser also uses it for its issue tracker, with optional authentication for convenience.) Replace this web2py file with a modified version in the same folder as this README: <pre> {web2py-2.4.4}/gluon/contrib/login_methods/oauth20_account.py </pre>
Create the sym links for the main web app and the study curation tool. <pre> cd web2py/applications ln -s /full/path/to/opentree/webapp opentree ln -s /full/path/to/opentree/curator curator </pre>
Customize web2py’s site-wide routing behavior using "SITE.routes.py" <pre> # return to main web2py directory cd .. cp /full/path/to/opentree/SITE.routes.py routes.py </pre> This routing file works in tandem with the opentree app router and lets us have proper URLs with hyphens instead of underscores.
Launch web2py <pre> cd /full/path/to/web2py python web2py.py --nogui -a '<recycle>' </pre> Where the -a flag is allowing you to reuse the previous admin password that you used with this instance of web2py. **To test with login and proper domain name**, modify your test system's `/etc/hosts` file (or equivalent) to resolve the domain `devtree.opentreeoflife.org` to localhost (127.0.0.1). Then run web2py on (privileged) port 80 like so: <pre> cd /full/path/to/web2py sudo python web2py.py --nogui -p 80 -a '<recycle>' </pre> **To test with local HTTPS**, modify your test system's `/etc/hosts` file as described above, then use a [web2py options file]() to support HTTP traffic on port 80 and HTTPS on port 443. This requires working key and cert files. to localhost (127.0.0.1). Then run web2py on (privileged) port 80 like so: <pre> cd /full/path/to/web2py sudo python web2py.py --verbose -L multiport_options.py </pre> This looks for the options file `multiport_options.py` in the same directory as `web2py.py`, with contents something like this: <pre> import os interfaces = [( '0.0.0.0', 80 ), ( '0.0.0.0', 443, '/Volumes/SecureFiles/.ssh/opentree/ssl-keys/opentreeoflife.org.key', '/Volumes/SecureFiles/.ssh/opentree/ssl-keys/STAR_opentreeoflife_org.crt' )] password = '<recycle>' pid_filename = 'httpserver.pid' log_filename = 'httpserver.log' folder = os.getcwd() </pre> Now you should be able to use production domain names, secure connections, and OAuth as in the production setup.
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