CSD Related Links

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CSD Links

Potential Issues for Public Comment

Public comments can be submitted according to this process at the following comment form

  • how to map hcIdentifier used in HPD to II ?
  • no date of birth in persons
  • do we need Org/Facility Contact to be required?
  • orgType, orgTypeDescription, orgPrimaryName are all required but perhaps should not be. similarly for facility.
  • minoccurs on orglanguage is not set, but is set for facilityLanguage
  • no place to add other identifiers for facility
  • should creation date be required?
  • facility can be in multiple facilityorgid? how to represent one facility in multiple hierarchies that are not necc. mapped to services
  • is a lastmodified time/create time for CSD doc needed?
  • CareServicesDiscoveryQuery/XQueryFunction has no ability to set parameters (e.g. nid). Options would include:
    • for un-ordered named variables something we define such as 
      <XQueryFunction name="loopup_by_nid.xq"><value name="nid">123</value></XqueryFUnciton>
    • XML-RPC for ordered unnamed variables
    • some other structured XML that knows about xquery data types (note: XQuery shares the same data types as XML Schema 1.0 , XSD).
    • existdb web api POST which has parameters for every query such as start, max, session-id, cache=yes/no
  • CareServicesDiscoveryQuery/XQueryResult/queryResult may not be valid XML.. Should it always be a CDATA?

Implementation Notes

Source code:

On the test server the repo lives under /home/ubuntu/CSD with

WebDAV + Subversion

Subversion is used to hold the source code and the source CSD documents. In deployment the php source code and CSD documents should not be in the same repository.

Enable the web service with

  • sudo ln -s /home/ubuntu/CSD/www /var/www/CSD

index.php, the PHP Glue

  • documents and queries retrieved from webdav are cached with APC is available. May need adjust ini.apc.shm-size depending on size of documents.
  • main script is "www/index.php" which should be symlinked under /var/www/where/ever/index.php
  • configuration such as webdav server url, passwords, cache limits, etc. are stored in config.php.. You can also store in local/config.php which is ignored in the subversion repository so you can commit without storing your passwords.
  • special doc is docs/CSD.xml which is to be considered the "published" doc. It this setup, it is the XQuery server's responsibility to track any changes to docs/CSD.xml.
  • NOTE: To ease xquery server engines ability to monitor the published CSD.xml, we should consider adding/ensuring there is a RSS feed for the svn repository (e.g.):

Zorba Implementation Notes

    • zorba does not install exactly according to the instructions found online. In particular make sure you:
    • do "sudo apt-get install swig" before running cmake
    • do "-D CMAKE_INSTALL_PREFIX=/usr/local .. " in the build directory

There is a server script to keep an instance of zorba running with the CSD loaded in memory. There are actually two, one that binds to a socket on localhost which can be started: <source lang='bash'> cd ~/CSD/zorba_server php init_uds.php > /tmp/zorba_server.out & </source> and one AF_UNIX that opens a socket on /tmp/zorba_server.sock <source lang='bash'> cd ~/CSD/zorba_server sudo -u www-data rm /tmp/zorba_server.sock sudo -u www-data php init_uds.php > /tmp/zorba_server_uds.out & </source>

Prototype CSD Interface

Use Cases:

  • Prototyping CSD interface
  • Easy to deploy, XQuery based, CSDDirectory facade for other registries. For example:
    • for any FRED-API compliant Facility Registry (e.g. DHIS or ResourceMap) once the issue on XML Endpoints is resolved. Note, this facade could also provide some of the functionality wished for here [1], though with XQuery rather than XSLT as the transformation language and still the need to track FRED-API version used by the FR.
  • Performance testing of XQuery engines (baseX,existDb,zorba, others)

CareServicesConsumerQuery

Submit a POST request to zorba_manager.php with your document. Some sample documents are found in test_csdq

You can test this with, for example:

 curl -X POST -d @/home/ubuntu/CSD/test_csdq/stats_named.xq.xml http://csd.ihris.org/CSD/zorba_manager.php

Searches

Named/Canned Xquery searches are made available under queries/search via the web dav server. If there is a file queries/search/blah/blah.xq, you can access it as http://csd.ihris.org/CSD/zorba_manager.php/search/blah/blah.xq. The dynamic context of the search is the published CSD document at time of the zorba server initialization. For the time being, and GET variables are passed on to the query. This is wide open at the moment and we need to lock it down.

Publishing

Named/Canned Xquery use to publish CSD documents are made available under queries/publish via the web dav server. If there is a file queries/publish/blah/blah.xq, you can access it as http://csd.ihris.org/CSD/zorba_manager.php/publish/blah/blah.xq. Each document under docs, with the exclusion of CSD.xml, is available to the xquery. If the resulting document passes validation via the .xsd it is published to the web dav server.

Currently there is one publishing script queries/publish/simple_merge.xq.


Currently, there is no way to tell the zorba server to reload/refresh the CSD source document after publication. You need to login to the server and restart the "zorba_server/init.php" process manually.

Updating

Named/Canned Xquery use to publish CSD documents are made available under queries/publish via the web dav server. If there is a file queries/publish/blah/blah.xq, you can access it as http://csd.ihris.org/CSD/zorba_manager.php/update/blah/blah.xq. Each document under docs is available to the xquery and "CSD.xml" is set to be the default context. If the resulting document passes validation via the .xsd it is published to the web dav server.

There are no update scripts as of yet. The intention is that scripts here are used to update the currently published CSD.xml, for example with an update of facilities. How this update occurs is defined by the update script. An example workflow would be:

  • XML data exported from FRED-API compliant FR with updates since a given time.
  • This data is posted to webdav server under the docs/ directory as, for example, "fr_updates.xml"
  • There is an xquery script, for example "fr_update.xq", under "queries/update/" that would:
    • scan fr_updates.xml for any new facilities and add them to the CSD.xml, which is the default context
    • scan fr_updates.xml for any existing facilities and either delete/replace the entire <facility> node, or overwrite any values contained within it as necessary.

Profiling

Currently there are no indices are the zorba server's data store.

  • It can process about 90 NID look-ups per second through the web interface on localhost.
    • webdav lookups are cached in php-apc
  • Actually executing the query on zroba takes, for example, 0.0078308582305908 seconds so there is not too much overhead in the php script
    • caching compiled queries (currently set at 200 max) reduces average response time (after cache) to 0.0058491230010986

which amounts to about 100 NID lookups per second

    • caching result in APC (of a NID lookup) didn't seem to make much difference in response time.
  • Loading the CSD.xml document in zorba's memory store required 2.5mb.
  • Results on m1.large Amazon EC2 instance
$ httperf --hog --server localhost --uri /CSD/index.php/search/search_by_nid.xq?nid=1197580084757020         --num-conn 500 
httperf --hog --client=0/1 --server=localhost --port=80 --uri=/CSD/index.php/search/search_by_nid.xq?nid=1197580084757020 --send-buffer=4096 --recv-buffer=16384 --num-conns=500 --num-calls=1
httperf: warning: open file limit > FD_SETSIZE; limiting max. # of open files to FD_SETSIZE
Maximum connect burst length: 1

Total: connections 500 requests 500 replies 500 test-duration 5.260 s

Connection rate: 95.1 conn/s (10.5 ms/conn, <=1 concurrent connections)
Connection time [ms]: min 5.1 avg 10.5 max 16.9 median 10.5 stddev 1.0
Connection time [ms]: connect 0.2
Connection length [replies/conn]: 1.000

Request rate: 95.1 req/s (10.5 ms/req)
Request size [B]: 120.0

Reply rate [replies/s]: min 95.0 avg 95.0 max 95.0 stddev 0.0 (1 samples)
Reply time [ms]: response 10.3 transfer 0.0
Reply size [B]: header 193.0 content 281.0 footer 0.0 (total 474.0)
Reply status: 1xx=0 2xx=500 3xx=0 4xx=0 5xx=0

CPU time [s]: user 0.98 system 3.38 (user 18.6% system 64.3% total 82.9%)
Net I/O: 55.1 KB/s (0.5*10^6 bps)

Errors: total 0 client-timo 0 socket-timo 0 connrefused 0 connreset 0
Errors: fd-unavail 0 addrunavail 0 ftab-full 0 other 0
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