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Linked events

Build status Requirements Stories in Ready

Linked Events provides categorized data on events and places. The project was originally developed for the City of Helsinki.

The Linked Events API for the Helsinki capital region contains data from the Helsinki City Tourist & Convention Bureau, the City of Helsinki Cultural Office and the Helmet metropolitan area public libraries.

Installation for development

These instructions assume an $INSTALL_BASE, like so:

INSTALL_BASE=$HOME/linkedevents

If you've already cloned this repository, just move repository root into $INSTALL_BASE/linkedevents. Otherwise just clone the repository, like so:

git clone https://github.com/City-of-Helsinki/linkedevents.git $INSTALL_BASE/linkedevents

Prepare Python 3.x virtualenv using your favorite tools and activate it. Plain virtualenv is like so:

virtualenv -p python3 $INSTALL_BASE/venv
source $INSTALL_BASE/venv/bin/activate

Install required Python packages into the virtualenv

cd $INSTALL_BASE/linkedevents
pip install -r requirements.txt

Create the database, like so: (we have only tested on PostgreSQL)

cd $INSTALL_BASE/linkedevents
sudo -u postgres createuser -R -S linkedevents
# Following is for US locale, we are not certain whether Linkedevents
# behaves differently depending on DB collation & ctype
#sudo -u postgres createdb -Olinkedevents linkedevents
# This is is for Finnish locale
sudo -u postgres createdb -Olinkedevents -Ttemplate0 -lfi_FI.UTF-8 linkedevents
# Create extensions in the database
sudo -u postgres psql linkedevents -c "CREATE EXTENSION postgis;"
sudo -u postgres psql linkedevents -c "CREATE EXTENSION hstore;"
# This fills the database with a basic skeleton
python manage.py migrate

You probably want to import some data for testing (these are events around Helsinki), like so:

cd $INSTALL_BASE/linkedevents
# Import places from Helsinki service registry (used by events from following sources)
python manage.py event_import tprek --places
# Import events from Visit Helsinki
python manage.py event_import matko --events
# Import events from Helsinki metropolitan region libraries
python manage.py event_import helmet --events

Furthermore, you may install city-specific HTML page templates for the browsable API by

cd $INSTALL_BASE/linkedevents
python manage.py install_templates helevents

This will install the helevents/templates/rest_framework/api.html template, which contains Helsinki event data summary and license. Customize the template for your favorite city by creating your_favorite_city/templates/rest_framework/api.html. For further erudition, take a look at the DRF documentation on customizing the browsable API

After this, everything but search endpoint (/search) is working. See search

Running tests

Tests must be run using an user who can create (and drop) databases and write the directories your linkedevents installation resides in. Also the template database must include Postgis and HSTORE-extensions. If you are developing, you probably want to give those permissions to the database user configured in your development instance. Like so:

# Change this if you have different DB user
DATABASE_USER=linkedevents
# Most likely you have a postgres system user that can log into postgres as DB postgres user
sudo -u postgres psql << EOF
ALTER USER "$DATABASE_USER" CREATEDB;
\c template1
CREATE EXTENSION IF NOT EXISTS postgis;
CREATE EXTENSION IF NOT EXISTS hstore;
EOF

Afterwards you can run the tests:

cd $INSTALL_BASE/linkedevents
py.test events

Note that search tests will fail unless you configure search

Requirements

Linked Events uses two files for requirements. The workflow is as follows.

requirements.txt is not edited manually, but is generated with pip-compile.

requirements.txt always contains fully tested, pinned versions of the requirements. requirements.in contains the primary, unpinned requirements of the project without their dependencies.

In production, deployments should always use requirements.txt and the versions pinned therein. In development, new virtualenvs and development environments should also be initialised using requirements.txt. pip-sync will synchronize the active virtualenv to match exactly the packages in requirements.txt.

In development and testing, to update to the latest versions of requirements, use the command pip-compile. You can use requires.io to monitor the pinned versions for updates.

To remove a dependency, remove it from requirements.in, run pip-compile and then pip-sync. If everything works as expected, commit the changes.

Search

Linkedevents uses Elasticsearch for generating results on the /search-endpoint. If you wish to use that functionality, proceed like so:

  1. Install elasticsearch

    We've only tested using the rather ancient 1.7 version. Version 5.x will certainly not work as the django-haystack-library does not support it. If you are using Ubuntu 16.04, 1.7 will be available in the official repository.

  2. (For finnish support) Install elasticsearch-analyzer-voikko, libvoikko and needed dictionaries

    /usr/share/elasticsearch/bin/plugin -i fi.evident.elasticsearch/elasticsearch-analysis-voikko/0.4.0 This specific command is for Debian derivatives. The path to plugin command might be different on yours. Note that version 0.4.0 is the one compatible with Elasticsearch 1.7

    Installing libvoikko: apt-get install libvoikko1

    Installing the dictionaries (v5 dictionaries are needed for libvoikko version included in Ubuntu 16.04):

    

    3. 



   wget -P $INSTALL_BASE http://www.puimula.org/htp/testing/voikko-snapshot-v5/dict-morpho.zip
   unzip $INSTALL_BASE/dict-morpho.zip -d /etc/voikko
```


    

  1. 

    Configure the thing
    

    Add the long block below these instructions to $INSTALL_BASE/linkedevents/local_settings.py. If you are familiar with Django haystack, feel free to customize it.
    

    2. 

  2. 

    Rebuild the search indexes
    

    3. 



  python manage.py rebuild_index
 
  You should now have a working /search endpoint, give or take a few.


CUSTOM_MAPPINGS = {
    'autosuggest': {
        'search_analyzer': 'standard',
        'index_analyzer': 'edgengram_analyzer',
        'analyzer': None
    },
    'text': {
        'analyzer': 'default'
    }
}

HAYSTACK_CONNECTIONS = {
    'default': {
        'ENGINE': 'multilingual_haystack.backends.MultilingualSearchEngine',
    },
    'default-fi': {
        'ENGINE': 'multilingual_haystack.backends.LanguageSearchEngine',
        'BASE_ENGINE': 'events.custom_elasticsearch_search_backend.CustomEsSearchEngine',
        'URL': 'http://localhost:9200/',
        'INDEX_NAME': 'linkedevents-fi',
        'MAPPINGS': CUSTOM_MAPPINGS,
        'SETTINGS': {
            "analysis": {
                "analyzer": {
                    "default": {
                        "tokenizer": "finnish",
                        "filter": ["lowercase", "voikko_filter"]
                    }
                },
                "filter": {
                    "voikko_filter": {
                        "type": "voikko",
                    }
                }
            }
        }
    },
    'default-sv': {
        'ENGINE': 'multilingual_haystack.backends.LanguageSearchEngine',
        'BASE_ENGINE': 'events.custom_elasticsearch_search_backend.CustomEsSearchEngine',
        'URL': 'http://localhost:9200/',
        'INDEX_NAME': 'linkedevents-sv',
        'MAPPINGS': CUSTOM_MAPPINGS
    },
    'default-en': {
        'ENGINE': 'multilingual_haystack.backends.LanguageSearchEngine',
        'BASE_ENGINE': 'events.custom_elasticsearch_search_backend.CustomEsSearchEngine',
        'URL': 'http://localhost:9200/',
        'INDEX_NAME': 'linkedevents-en',
        'MAPPINGS': CUSTOM_MAPPINGS
    },
}