github.com/mapbox/tilelive-decorator

tilelive-decorator

Load vector tiles from a tilelive source and decorate them with properties from redis. So if you use tilelive-s3 it can load tiles from s3, and add properties to features from redis.

usage

with tilelive

Tilelive decorator registers several tilelive protocols:

• decorator+s3: for reading tiles from S3
• decorator+mbtiles: for reading tiles from an mbtiles

var tilelive = require('tilelive');
var TileliveDecorator = require('tilelive-decorator');
var TileliveS3 = require('tilelive-s3');

TileliveDecorator.registerProtocols(tilelive);
TileliveS3.registerProtocols(tilelive);

tilelive.load('decorator+s3://test/{z}/{x}/{y}?key=id&sourceProps={"keep":["id","name"]}&redis=redis://localhost:6379', function(err, source) {
  // source.getTile(z, x, y, callback);
});

manually

var TileliveDecorator = require('tilelive-decorator');

var uri = 'decorator+s3://test/{z}/{x}/{y}?key=id&sourceProps={"keep":["id","name"]}&redis=redis://localhost:6379'
new TileliveDecorator(uri, function (err, source) {
  // source.getTile(z, x, y, callback);
});

options

key (required) - specifies what property in the source tiles will be matched to keys in redis.

sourceProps - a json object, specifying properties to keep from the source tile, and properties that are required to exist on features in the source tile. example: {"keep": ["id", "class"], "required": ["rating"]}. If all required properties don't exist on a feature, that feature is filtered out.

redisProps - a json object, specifying properties to keep from redis records, and properties that are required to exist on redis records. example: {"keep": ["congestion"], "required": ["speed"]}. If all required properties don't exist on a record, that record is filtered out and no new properties will be applied to features that match the record key.

outputProps - a json object, specifying properties to keep in the output tile after decoration, and properties that are required to exist on features in the output tile. example: {"keep": ["class", "congestion"], "required": ["congestion"]}. If all required properties don't exist on a feature, that feature is filtered out.

redis - a redis connection string, e.g. redis://localhost:6379.

hashes - If hashes=true is included, redis keys are treated as hash types as opposed to stringified JSON data in string type keys. In this case hget is used instead of the default get commands.

development

setup

Tests and benchmarks require a local redis server

brew install redis
git clone https://github.com/mapbox/tilelive-decorator
cd tilelive-decorator
npm install
redis-server --save "" &

benchmarks

redis-cli flushall && node benchmark.js

tests

redis-cli flushall && npm test