JSON API for ride fare estimation.
Estimator calculates estimated ride fare based on tariff, origin and destination coordinates. It does this using router.
Estimator is written as a Sinatra app as Sinatra is a simple and fast ruby micro-framework. Users are faced with a JSON API which is easy to parse and comprehend.
To run the app use following commands:
cd ruby/estimator
bundle install
bundle exec ruby application.rb
API usage example:
// GET http://localhost:4567/tariffs
{
"tariffs":[{
"name":"business",
"booking":"150.00",
"per_minute":"15.00",
"per_km":"38.00",
"min_fare":"299.00"
}],
"currency":"RUB"
}
// GET http://localhost:4568/estimate?origin=55.709876,37.653323&destination=55.804302,37.5835381
{
"routes":[{
"map_points":[{
"lat":55.709876,"long":37.653323
},{
"lat":55.804302,"long":37.583538
}],
"distance":19934,
"duration":1511,
"fare":"1285.24"
}],
"tariff":"business",
"currency":"RUB"
}
Router estimates distance and duration betweed origin and destination. Router is an adapter for third party routing geo-services.
You can use router as a gem in your ruby application and build adapters for desired services. But also Router gem can be run as a sinatra application providing adapter for itself.
To run router as a sinatra application run.
cd ruby/router
bundle install
bundle exec ruby application.rb
API usage example:
// GET http://localhost:4567/estimate?origin=55.709876,37.653323&destination=55.804302,37.5835381
{
"routes":[{
"map_points":[{
"lat":55.709876,"long":37.653323
},{
"lat":55.804302,"long":37.583538
}],
"distance":19934,
"duration":1511
}]
}
Estimator uses Router's SelfAdapter to get routing from Router's sinatra application via HTTP:
router = Router.build(adapter: :Self, cache: true)
router.call(
Router::MapPoint.new(lat: 55.709876, long: 37.653323)
Router::MapPoint.new(lat: 55.804302, long: 37.583538)
) # => [<#Router::Route @map_points=[...] @distance=19934 @duration=1511>]
But it can easily skip HTTP step and use other adapters directly skipping Router as a microservice:
router = Router.build(adapter: :OSM, cache: true)
At the moment Router supports only OSM backend and uses it by default.
In order to use OSM adapter you need to run osrm service with some actual geodata.
mkdir osrm && cd osrm
wget http://download.geofabrik.de/russia/central-fed-district-latest.osm.pbf
docker pull osrm/osrm-backend
docker run -t -v $(pwd):/data osrm/osrm-backend osrm-extract -p /opt/car.lua /data/central-fed-district-latest.osm.pbf
docker run -t -v $(pwd):/data osrm/osrm-backend osrm-contract /data/central-fed-district-latest.osrm
docker run -t -i -p 5000:5000 -v $(pwd):/data osrm/osrm-backend osrm-routed /data/central-fed-district-latest.osrm
- TESTS
- Tariff repository.
- Cache hashing algorithm.
- Command line options.
- Edge cases and error handling.
- Golang version of apps and speed comparison.
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