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|
###
termap - Terminal Map Viewer
by Michael Strassburger <codepoet@cpan.org>
Source for VectorTiles - supports
* remote TileServer
* local MBTiles and VectorTiles
###
Promise = require 'bluebird'
userhome = require 'userhome'
fetch = require 'node-fetch'
fs = require 'fs'
Tile = require './Tile'
config = require './config'
# https://github.com/mapbox/node-mbtiles has native build dependencies (sqlite3)
# To maximize mapscii's compatibility, MBTiles support must be manually added via
# $> npm install -g mbtiles
MBTiles = try
require 'mbtiles'
catch
null
module.exports = class TileSource
cache: {}
cached: []
modes:
MBTiles: 1
VectorTile: 2
HTTP: 3
mode: null
mbtiles: null
styler: null
init: (@source) ->
if @source.startsWith "http"
@_initPersistence() if config.persistDownloadedTiles
@mode = @modes.HTTP
else if @source.endsWith ".mbtiles"
unless MBTiles
throw new Error "MBTiles support must be installed with following command: 'npm install -g mbtiles'"
@mode = @modes.MBTiles
@loadMBtils source
else
throw new Error "source type isn't supported yet"
loadMBtils: (source) ->
new Promise (resolve, reject) =>
new MBTiles source, (err, @mbtiles) =>
if err then reject err
else resolve()
useStyler: (@styler) ->
getTile: (z, x, y) ->
unless @mode
throw new Error "no TileSource defined"
z = Math.max 0, Math.floor z
if cached = @cache[[z,x,y].join("-")]
return Promise.resolve cached
if @cached.length > 4
for tile in @cached.splice 0, Math.abs(4-@cached.length)
delete @cache[tile]
switch @mode
when @modes.MBTiles then @_getMBTile z, x, y
when @modes.HTTP then @_getHTTP z, x, y
_getHTTP: (z, x, y) ->
promise =
if config.persistDownloadedTiles and tile = @_getPersited z, x, y
Promise.resolve tile
else
fetch @source+[z,x,y].join("/")+".pbf"
.then (res) => res.buffer()
.then (buffer) =>
@_persistTile z, x, y, buffer if config.persistDownloadedTiles
buffer
promise
.then (buffer) =>
@_createTile z, x, y, buffer
_getMBTile: (z, x, y) ->
new Promise (resolve, reject) =>
@mbtiles.getTile z, x, y, (err, buffer) =>
return reject err if err
resolve @_createTile z, x, y, buffer
_createTile: (z, x, y, buffer) ->
name = [z,x,y].join("-")
@cached.push name
tile = @cache[name] = new Tile @styler
tile.load buffer
_initPersistence: ->
try
@_createFolder userhome ".mapscii"
@_createFolder userhome ".mapscii", "cache"
catch error
config.persistDownloadedTiles = false
return
_persistTile: (z, x, y, buffer) ->
zoom = z.toString()
@_createFolder userhome ".mapscii", "cache", zoom
fs.writeFile userhome(".mapscii", "cache", zoom, "#{x}-#{y}.pbf"), buffer, -> null
_getPersited: (z, x, y) ->
try
fs.readFileSync userhome ".mapscii", "cache", z.toString(), "#{x}-#{y}.pbf"
catch error
false
_createFolder: (path) ->
try
fs.mkdirSync path
true
catch e
e.code is "EEXIST"
|
