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Python wrapper for DHIS2

Project description

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A Python library for DHIS2 wrapping requests for general-purpose API interaction with DHIS2. It attempts to be useful for any data/metadata import tasks including various utilities like file loading, UID generation and logging. A strong focus is on JSON.

Supported and tested on Python 2 and 3 on Linux/macOS, Windows and DHIS2 versions >= 2.25.

1   Installation

1.1   with pipenv

Simply use pipenv:

pipenv install dhis2.py --upgrade

1.2   with pip

pip install dhis2.py --upgrade

For instructions on installing Python / pip for your operating system see The Hitchhiker’s Guide to Python.

2   Quickstart

Create an API object:

from dhis2 import Dhis

api = Dhis('play.dhis2.org/demo', 'admin', 'district')

Then run requests on it:

r = api.get('organisationUnits/Rp268JB6Ne4', params={'fields': 'id,name'})

print(r.json())
# { "name": "Adonkia CHP", "id": "Rp268JB6Ne4" }

r = api.post('metadata', json={'dataElements': [ ... ] })
print(r.status_code) # 200
  • api.get()
  • api.post()
  • api.put()
  • api.patch()
  • api.delete()

see below for more methods.

3   Usage

3.1   Dhis instance creation

3.1.1   Authentication in code

Create an API object

from dhis2 import Dhis

api = Dhis('play.dhis2.org/demo', 'admin', 'district')

optional arguments:

  • api_version: DHIS2 API version
  • user_agent: submit your own User-Agent header. This is useful if you need to parse e.g. Nginx logs later.

3.1.2   Authentication from file

Load from a auth JSON file in order to not store credentials in scripts. Must have the following structure:

{
  "dhis": {
    "baseurl": "http://localhost:8080",
    "username": "admin",
    "password": "district"
  }
}
from dhis2 import Dhis

api = Dhis.from_auth_file('path/to/auth.json', api_version=29, user_agent='myApp/1.0')

If no file path is specified, it tries to find a file called dish.json in:

  1. the DHIS_HOME environment variable
  2. your Home folder

3.1.3   Get info about the DHIS2 instance

API version as a string:

print(api.version)
# '2.30'

API version as an integer:

print(api.version_int)
# 30

API revision / build:

print(api.revision)
# '17f7f0b'

API URL:

print(api.api_url)
# 'https://play.dhis2.org/demo/api/30'

Base URL:

print(api.base_url)
# 'https://play.dhis2.org/demo'

system info (this is persisted across the session):

print(api.info)
# {
#   "lastAnalyticsTableRuntime": "11 m, 51 s",
#   "systemId": "eed3d451-4ff5-4193-b951-ffcc68954299",
#   "contextPath": "https://play.dhis2.org/2.30",
#   ...

3.2   Getting things

Normal method: api.get()

3.2.1   Paging

Paging for larger GET requests via api.get_paged()

Two possible ways:

  1. Process every page as they come in:
for page in api.get_paged('organisationUnits', page_size=100):
    print(page)
    # { "organisationUnits": [ {...}, {...} ] } (100 organisationUnits)
  1. Load all pages before proceeding (this may take a long time) - to do this, do not use for and add merge=True:
all_pages = api.get_paged('organisationUnits', page_size=100, merge=True):
print(all_pages)
# { "organisationUnits": [ {...}, {...} ] } (all organisationUnits)

Note: Returns directly a JSON object, not a requests.response object unlike normal GETs.

3.2.2   SQL Views

Get SQL View data as if you’d open a CSV file, optimized for larger payloads, via api.get_sqlview()

# poll a sqlView of type VIEW or MATERIALIZED_VIEW:
for row in api.get_sqlview('YOaOY605rzh', execute=True, criteria={'name': '0-11m'}):
    print(row)
    # {'code': 'COC_358963', 'name': '0-11m'}

# similarly, poll a sqlView of type QUERY:
for row in api.get_sqlview('qMYMT0iUGkG', var={'valueType': 'INTEGER'}):
    print(row)

# if you want a list directly, cast it to a ``list`` or add ``merge=True``:
data = list(api.get_sqlview('qMYMT0iUGkG', var={'valueType': 'INTEGER'}))
# OR
# data = api.get_sqlview('qMYMT0iUGkG', var={'valueType': 'INTEGER'}, merge=True)

Note: Returns directly a JSON object, not a requests.response object unlike normal GETs.

Beginning of 2.26 you can also use normal filtering on sqlViews. In that case, it’s recommended to use the stream=True parameter of the Dhis.get() method.

3.2.3   GET other content types

Usually defaults to JSON but you can get other file types:

r = api.get('organisationUnits/Rp268JB6Ne4', file_type='xml')
print(r.text)
# <?xml version='1.0' encoding='UTF-8'?><organisationUnit ...

r = api.get('organisationUnits/Rp268JB6Ne4', file_type='pdf')
with open('/path/to/file.pdf', 'wb') as f:
    f.write(r.content)

3.3   Updating / deleting things

Normal methods:

  • api.post()
  • api.put()
  • api.patch()
  • api.delete()

3.3.1   Post partitioned payloads

If you have such a large payload (e.g. metadata imports) that you frequently get a HTTP Error: 413 Request Entity Too Large response e.g. from Nginx you might benefit from using the following method that splits your payload in partitions / chunks and posts them one-by-one. You define the amount of elements in each POST by specifying a number in thresh (default: 1000).

Note that it is only possible to submit one key per payload (e.g. dataElements only, not additionally organisationUnits in the same payload).

api.post_partitioned()

import json

data = {
    "organisationUnits": [
        {...},
        {...} # very large number of org units
    ]
{
for response in api.post_partitioned('metadata', json=data, thresh=5000):
    text = json.loads(response.text)
    print('[{}] - {}'.format(text['status'], json.dumps(text['stats'])))

3.4   Multiple params with same key

If you need to pass multiple parameters to your request with the same key, you may submit as a list of tuples instead when e.g.:

r = api.get('dataValueSets', params=[
        ('dataSet', 'pBOMPrpg1QX'), ('dataSet', 'BfMAe6Itzgt'),
        ('orgUnit', 'YuQRtpLP10I'), ('orgUnit', 'vWbkYPRmKyS'),
        ('startDate', '2013-01-01'), ('endDate', '2013-01-31')
    ]
)

alternatively:

r = api.get('dataValueSets', params={
    'dataSet': ['pBOMPrpg1QX', 'BfMAe6Itzgt'],
    'orgUnit': ['YuQRtpLP10I', 'vWbkYPRmKyS'],
    'startDate': '2013-01-01',
    'endDate': '2013-01-31'
})

3.5   Utilities

3.5.1   Load JSON file

from dhis2 import load_json

json_data = load_json('/path/to/file.json')
print(json_data)
# { "id": ... }

3.5.2   Load CSV file

Via a Python generator:

from dhis2 import load_csv

for row in load_csv('/path/to/file.csv'):
    print(row)
    # { "id": ... }

Via a normal list, loaded fully into memory:

data = list(load_csv('/path/to/file.csv'))

3.5.3   Generate UIDs

Create UIDs on the server (not limited to 10000):

uids = api.generate_uids(20000)
print(uids)
# ['Rp268JB6Ne4', 'fa7uwpCKIwa', ... ]

If you want UIDs generated locally (no server calls), add local=True.

3.5.4   Clean an object

Useful for removing e.g. all user or userGroupAccesses from an object.

from dhis2 import clean_obj

# obj = {
#   "dataElements": [
#       {
#           "name": "GL- DE001",
#           "user": {
#               "id": "gONaRemoveThis"
#           }
#       }
#   ]
# }

cleaned = clean_obj(obj, 'user')
print(cleaned)

# obj = {
#     "dataElements": [
#         {
#             "name": "GL- DE001",
#         }
#     ]
# }

Submit more keys to remove by wrapping them into a list or set. This works recursively.

3.6   Logging

Logging utilizes logzero.

  • Color output depending on log level
  • DHIS2 log format including the line of the caller
  • optional logfile= specifies a rotating log file path (20 x 10MB files)
from dhis2 import setup_logger, logger

setup_logger(logfile='/var/log/app.log')

logger.info('my log message')
logger.warn('missing something')
logger.error('something went wrong')
logger.exception('with stacktrace')
* INFO  2018-06-01 18:19:40,001  my log message [script:86]
* ERROR  2018-06-01 18:19:40,007  something went wrong [script:87]

Use setup_logger(include_caller=False) if you want to remove [script:86] from logs.

3.7   Exceptions

There are two exceptions:

  • APIException: DHIS2 didn’t like what you requested. See the exception’s code, url and description.
  • ClientException: Something didn’t work with the client not involving DHIS2.

They both inherit from Dhis2PyException.

4   Examples

  • Real-world script examples can be found in the examples folder.
  • dhis2.py is used in dhis2-pk (dhis2-pocket-knife)

6   Contribute

Feedback welcome!

  • Add issue
  • Install the dev environment (see below)
  • Fork, add changes to master branch, ensure tests pass with full coverage and add a Pull Request
pip install pipenv
git clone https://github.com/davidhuser/dhis2.py
cd dhis2.py
pipenv install --dev
pipenv run tests

7   License

dhis2.py’s source is provided under MIT license. See LICENCE for details.

  • Copyright (c), 2018, David Huser

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