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tilelive-promise

v2.0.0

Published

Adds an extended Promise-based interface to the existing tilelive components, or exposes new components to older tilelive systems.

Downloads

91

Readme

Build Status

tilelive-promise

Adds an extended Promise-based interface to the existing tilelive components, or exposes new components to older tilelive systems.

This module supplies either a modern or a legacy wrapper for the tilelive (TileSource) object.

For sources that implement getTile(), getGrid() and getInfo(), creates a new getAsync() generic function.

For sources that implement getAsync(), supplies the callback-based getTile(), getGrid() and getInfo().

If both getTile() and getAsync() are present, the instance is returned unmodified.

Promise<object> getAsync(options)

The new function allows to treat get*() as promises, permits additional parameter passing with each request (e.g. scaling, format, language), and allow non-tile data to be retrieved through the same system.

Both tile and grid requests via GetAsync() may also use an index parameter instead of (x,y) coordinates. Index is a single 56bit quadtile integer, allowing up to zoom 26.

getAsync() returns a Promise that resolves to an object. The content of the object depends on the type.

Legacy vs New interface

| get*() tilelive API | getAsync() API | |-----------------------|-------------------| |getTile(z, x, y,  callback<err, tile, headers>)|Promise{data, headers} getAsync({z, x, y}) or Promise{data, headers} getAsync(  {type:'tile', z, x, y})| |getGrid(z, x, y,  callback<err, grid, headers>)|Promise{data, headers} getAsync(  {type:'grid', z, x, y})| |getInfo(callback<err, info>) |Promise{data} getAsync({type:'info'})|