CommCare Export

https://github.com/dimagi/commcare-export

A command-line tool (and Python library) to generate customized exports from the CommCare HQ REST API.

• User documentation
• Changelog

Installation & Quick Start

0a. Install Python 3. This tool is tested with Python 3.6, 3.7, and 3.8.

0b. Sign up for CommCare HQ if you have not already.

1. Install CommCare Export via pip

$ python3 -m pip install wheel
$ python3 -m pip install commcare-export

2. Create a project space and application.

3. Visit the Release Manager, make a build, click the star to release it.

4. Use Web Apps and fill out some forms.

5. Modify one of example queries in the examples/ directory, modifying the "Filter Value" column to match your form XMLNS / case type. See this page to determine the XMLNS for your form.

$ commcare-export \
     --query examples/demo-registration.xlsx \
     --project YOUR_PROJECT \
     --output-format markdown

$ commcare-export \
     --query examples/demo-registration.json \
     --project YOUR_PROJECT \
     --output-format markdown

$ commcare-export \
     --query examples/demo-deliveries.xlsx \
     --project YOUR_PROJECT \
     --output-format markdown

$ commcare-export \
     --query examples/demo-deliveries.json \
     --project YOUR_PROJECT \
     --output-format markdown

You'll see the tables printed out. Change to --output-format sql --output URL_TO_YOUR_DB --since DATE to sync all forms submitted since that date.

Example query files are provided in both Excel and JSON format. It is recommended to use the Excel format as the JSON format may change upon future library releases.

Command-line Usage

The basic usage of the command-line tool is with a saved Excel or JSON query (see how to write these, below)

$ commcare-export --commcare-hq <URL or alias like "local" or "prod"> \
                  --username <username> \
                  --project <project> \
                  --api-version <api version, defaults to latest known> \
                  --version <print current version> \
                  --query <excel file, json file, or raw json> \
                  --output-format <csv, xls, xlsx, json, markdown, sql> \
                  --output <file name or SQL database URL> \
                  --users <export data about project's mobile workers> \
                  --locations <export data about project's location hierarchy> \
                  --with-organization <export users, locations and joinable form or case tables>

See commcare-export --help for the full list of options.

There are example query files for the CommCare Demo App (available on the CommCare HQ Exchange) in the examples/ directory.

--output

CommCare Export uses SQLAlachemy's create_engine to establish a database connection. This is based off of the RFC-1738 protocol. Some common examples:

# Postgres
postgresql+psycopg2://scott:tiger@localhost/mydatabase

# MySQL
mysql+pymysql://scott:tiger@localhost/mydatabase

# MSSQL
mssql+pyodbc://scott:tiger@localhost/mydatabases?driver=ODBC+Driver+17+for+SQL+Server

Excel Queries

An Excel query is any .xlsx workbook. Each sheet in the workbook represents one table you wish to create. There are two grouping of columns to configure the table:

• Data Source: Set this to form to export form data, or case for case data.
• Filter Name / Filter Value: These columns are paired up to filter the input cases or forms.
• Field: The destination in your SQL database for the value.
• Source Field: The particular field from the form you wish to extract. This can be any JSON path.

JSON Queries

JSON queries are a described in the table below. You build a JSON object that represents the query you have in mind. A good way to get started is to work from the examples, or you could make an Excel query and run the tool with --dump-query to see the resulting JSON query.

User and Location Data

The --users and --locations options export data from a CommCare project that can be joined with form and case data. The --with-organization option does all of that and adds a field to Excel query specifications to be joined on.

Specifying the --users option or --with-organization option will export an additional table named 'commcare_users' containing the following columns:

The data in the 'commcare_users' table comes from the List Mobile Workers API endpoint.

Specifying the --locations option or --with-organization options will export an additional table named 'commcare_locations' containing the following columns:

The data in the 'commcare_locations' table comes from the Location API endpoint along with some additional columns from the Location Type API endpoint. The last columns in the table exist if you have set up organization levels for your projects. One column is created for each organization level. The column name is derived from the Location Type that you specified. The column value is the location_id of the containing location at that level of your organization. Consider the example organization from the CommCare help page. A piece of the 'commcare_locations' table could look like this:

In order to join form or case data to 'commcare_users' and 'commcare_locations' the exported forms and cases need to contain a field identifying which user submitted them. The --with-organization option automatically adds a field called 'commcare_userid' to each query in an Excel specification for this purpose. Using that field, you can use a SQL query with a join to report data about any level of you organization. For example, to count the number of forms submitted by all workers in each clinic:

SELECT l.clinic,
       COUNT(*)
FROM form_table t
LEFT JOIN (commcare_users u
           LEFT JOIN commcare_locations l
           ON u.commcare_location_id = l.location_id)
ON t.commcare_userid = u.id
GROUP BY l.clinic;

Note that the table names 'commcare_users' and 'commcare_locations' are treated as reserved names and the export tool will produce an error if given a query specification that writes to either of them.

The export tool will write all users to 'commcare_users' and all locations to 'commcare_locations', overwriting existing rows with current data and adding rows for new users and locations. If you want to remove obsolete users or locations from your tables, drop them and the next export will leave only the current ones. If you modify your organization to add or delete levels, you will change the columns of the 'commcare_locations' table and it is very likely you will want to drop the table before exporting with the new organization.

Python Library Usage

As a library, the various commcare_export modules make it easy to

• Interact with the CommCare HQ REST API
• Execute "Minilinq" queries against the API (a very simple query language, described below)
• Load and save JSON representations of Minilinq queries
• Compile Excel configurations to Minilinq queries

To directly access the CommCare HQ REST API:

from commcare_export.checkpoint import CheckpointManagerWithDetails
from commcare_export.commcare_hq_client import CommCareHqClient, AUTH_MODE_APIKEY
from commcare_export.commcare_minilinq import get_paginator, PaginationMode

username = 'some@username.com'
domain = 'your-awesome-domain'
hq_host = 'https://commcarehq.org'
API_KEY= 'your_secret_api_key'

api_client = CommCareHqClient(hq_host, domain, username, API_KEY, AUTH_MODE_APIKEY)
case_paginator=get_paginator(resource='case', pagination_mode=PaginationMode.date_modified)
case_paginator.init()
checkpoint_manager=CheckpointManagerWithDetails(None, None, PaginationMode.date_modified)

cases = api_client.iterate('case', case_paginator, checkpoint_manager=checkpoint_manager)

for case in cases:
	print(case['case_id'])

To issue a minilinq query against it, and then print out that query in a JSON serialization:

import getpass
import json
from commcare_export.minilinq import *
from commcare_export.commcare_hq_client import CommCareHqClient
from commcare_export.commcare_minilinq import CommCareHqEnv
from commcare_export.env import BuiltInEnv

api_client = CommCareHqClient(
    url="http://www.commcarehq.org",
    project='your_project',
    username='your_username',
    password='password',
    version='0.5'
)

source = Map(
   source=Apply(
       Reference("api_data"),
       Literal("form"),
       Literal({"filter": {"term": {"app_id": "whatever"}}})
   ),
   body=List([
       Reference("received_on"),
       Reference("form.gender"),
   ])
)

query = Emit(
   'demo-table',
   [
       Literal('Received On'),
       Literal('Gender')
   ],
   source
)

print json.dumps(query.to_jvalue(), indent=2)

results = query.eval(BuiltInEnv() | CommCareHqEnv(api_client) | JsonPathEnv())

if len(list(env.emitted_tables())) > 0:
    # with writers.Excel2007TableWriter("excel-output.xlsx") as writer:
    with writers.StreamingMarkdownTableWriter(sys.stdout) as writer:
        for table in env.emitted_tables():
            writer.write_table(table)

Which will output JSON equivalent to this:

{
    "Emit": {
        "headings": [
            {
                "Lit": "Received On"
            },
            {
                "Lit": "Gender"
            }
        ],
        "source": {
            "Map": {
                "body": {
                    "List": [
                        {
                            "Ref": "received_on"
                        },
                        {
                            "Ref": "form.gender"
                        }
                    ]
                },
                "name": None,
                "source": {
                    "Apply": {
                        "args": [
                            {
                                "Lit": "form"
                            },
                            {
                                "Lit": {
                                    "filter": {
                                        "term": {
                                            "app_id": "whatever"
                                        }
                                    }
                                }
                            }
                        ],
                        "fn": {
                            "Ref": "api_data"
                        }
                    }
                }
            }
        },
        "table": "demo-table"
    }
}

MiniLinq Reference

The abstract syntax can be directly inspected in the commcare_export.minilinq module. Note that the choice between functions and primitives is deliberately chosen to expose the structure of the MiniLinq for possible optimization, and to restrict the overall language.

Here is a description of the astract syntax and semantics

Built in functions like api_data and basic arithmetic and comparison are provided via the environment, referred to be name using Ref, and utilized via Apply.

List of builtin functions:

Output Formats

Your MiniLinq may define multiple tables with headings in addition to their body rows by using Emit expressions, or may simply return the results of a single query.

If your MiniLinq does not contain any Emit expressions, then the results of the expression will be printed to standard output as pretty-printed JSON.

If your MiniLinq does contain Emit expressions, then there are many formats available, selected via the --output-format <format> option, and it can be directed to a file with the --output <file> command-line option.

• csv: Each table will be a CSV file within a Zip archive.
• xls: Each table will be a sheet in an old-format Excel spreadsheet.
• xlsx: Each table will be a sheet in a new-format Excel spreadsheet.
• json: The tables will each be a member of a JSON dictionary, printed to standard output
• markdown: The tables will be streamed to standard output in Markdown format (very handy for debugging your queries)
• sql: All data will be idempotently "upserted" into the SQL database you specify, including creating the needed tables and columns.

Dependencies

Required dependencies will be automatically installed via pip. But since you may not care about all export formats, the various dependencies there are optional. Here is how you might install them:

# To export "xlsx"
$ pip install "commcare-export[xlsx]"

# To export "xls"
$ pip install "commcare-export[xls]"

# To sync with a Postgres database
$ pip install "commcare-export[postgres]"

# To sync with a mysql database
$ pip install "commcare-export[mysql]"

# To sync with a database which uses odbc (e.g. mssql)
$ pip install "commcare-export[odbc]"

# To sync with another SQL database supported by SQLAlchemy
$ pip install "commcare-export[base_sql]"
# Then install the python package for your database

Contributing

0. Sign up for GitHub, if you have not already, at https://github.com.

1. Fork the repository at https://github.com/dimagi/commcare-export.

2. Clone your fork, install into a virtualenv, and start a feature branch

$ mkvirtualenv commcare-export
$ git clone git@github.com:dimagi/commcare-export.git
$ cd commcare-export
$ pip install -e ".[test]"
$ git checkout -b my-super-duper-feature

3. Make your edits.

4. Make sure the tests pass. The best way to test for all versions is to sign up for https://travis-ci.org and turn on automatic continuous testing for your fork.

$ py.test
=============== test session starts ===============
platform darwin -- Python 2.7.3 -- pytest-2.3.4
collected 17 items

tests/test_commcare_minilinq.py .
tests/test_excel_query.py ....
tests/test_minilinq.py ........
tests/test_repeatable_iterator.py .
tests/test_writers.py ...

============ 17 passed in 2.09 seconds ============

5. Type hints are used in the env and minilinq modules. Check that any changes in those modules adhere to those types:

$ mypy --install-types @mypy_typed_modules.txt

6. Push the feature branch up

$ git push -u origin my-super-duper-feature

7. Visit https://github.com/dimagi/commcare-export and submit a pull request.

8. Accept our gratitude for contributing: Thanks!

Release process

1. Create a tag for the release

$ git tag -a "X.YY.0" -m "Release X.YY.0"
$ git push --tags

2. Create the source distribution

$ python setup.py sdist

Ensure that the archive (dist/commcare-export-X.YY.0.tar.gz) has the correct version number (matching the tag name).

3. Upload to pypi

$ pip install twine
$ twine upload -u dimagi dist/commcare-export-X.YY.0.tar.gz

4. Verify upload

https://pypi-hypernode.com/pypi/commcare-export

5. Create a release on github

https://github.com/dimagi/commcare-export/releases

Testing and Test Databases

The following command will run the entire test suite (requires DB environment variables to be set as per below):

$ py.test

To run an individual test class or method you can run, e.g.:

$ py.test -k "TestExcelQuery"
$ py.test -k "test_get_queries_from_excel"

To exclude the database tests you can run:

$ py.test -m "not dbtest"

When running database tests, supported databases are PostgreSQL, MySQL, MSSQL.

To run tests against selected databases can be done using test marks as follows:

py.test -m [postgres,mysql,mssql]

Database URLs can be overridden via environment variables:

POSTGRES_URL=postgresql://user:password@host/
MYSQL_URL=mysql+pymysql://user:password@host/
MSSQL_URL=mssql+pyodbc://user:password@host/

Postgresql

$ docker pull postgres:9.6
$ docker run --name ccexport-postgres -p 5432:5432 -e POSTGRES_PASSWORD=postgres -d postgres:9.6
$ export POSTGRES_URL=postgresql://postgres:postgres@localhost/

Docker postgres image docs

MySQL

$ docker pull mysql
$ docker run --name ccexport-mysql -p 3306:3306 -e MYSQL_ROOT_PASSWORD=pw -e MYSQL_USER=travis -e MYSQL_PASSWORD='' -d mysql

# create travis user
$ docker run -it --link ccexport-mysql:mysql --rm mysql sh -c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"'
mysql> CREATE USER 'travis'@'%';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'travis'@'%';

MSSQL

$ docker pull mcr.microsoft.com/mssql/server:2017-latest 
$ docker run -e "ACCEPT_EULA=Y" -e "MSSQL_SA_PASSWORD=Password@123" -p 1433:1433 --name mssql1 -d microsoft/mssql-server-linux:2017-latest

# install driver
$ curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
$ echo "deb [arch=amd64] https://packages.microsoft.com/ubuntu/$(lsb_release -rs)/prod $(lsb_release -rs) main" | sudo tee /etc/apt/sources.list.d/mssql-release.list

$ sudo apt-get update
$ sudo ACCEPT_EULA=Y apt-get install msodbcsql17
$ odbcinst -q -d

MSSQL for Mac OS

$ docker pull mcr.microsoft.com/mssql/server:2017-latest 
$ docker run -e "ACCEPT_EULA=Y" -e "MSSQL_SA_PASSWORD=Password@123" -p 1433:1433 --name mssql1 -d microsoft/mssql-server-linux:2017-latest

# Install driver
$ brew install unixodbc freetds

# Add the following 5 lines to /usr/local/etc/odbcinst.ini
[ODBC Driver 17 for SQL Server]
Description=FreeTDS Driver for Linux & MSSQL
Driver=/usr/local/lib/libtdsodbc.so
Setup=/usr/local/lib/libtdsodbc.so
UsageCount=1

# Create a soft link from /etc/odbcinst.ini to actual file
sudo ln -s /usr/local/etc/odbcinst.ini /etc/odbcinst.ini

Integration Tests

Running the integration tests requires API credentials from CommCare HQ that have access to the corpora domain. This user should only have access to the corpora domain.

These need to be set as environment variables as follows:

export HQ_USERNAME=<username>
export HQ_API_KEY=<apikey>

For Travis builds these are included as encrypted vars in the travis config.