lua-nginx-osm - Lua Tirex client driver for the ngx_lua based on the cosocket API
Current version is 0.43, 21, October, 2013. This library is considered active development status.
This Lua library is a Tirex client driver for the ngx_lua nginx module:
http://wiki.nginx.org/HttpLuaModule
This Lua library takes advantage of ngx_lua's cosocket API, which ensures 100% nonblocking behavior.
It also includes utility to handle metatile, URIs in Lua language. These utility is not depend on nginx, means pure lua implementation.
Note that at least ngx_lua 0.8.1 is required.
If you use Ubuntu Linux 12.04 (LTS) and after, there is a PPA(private package archive) for you. http://launchpad.net/~osmjapan/+archive/ppa Please see the above page for detail instructions.
lua_package_path "/path/to/lua-nginx-osm/?.lua;;";
lua_shared_dict osm_tirex 10m; ## mandatory to use osm.tirex module
server {
location /example {
content_by_lua '
local tirex = require "osm.tirex"
local tile = require "osm.tile"
local data = require "osm.data"
-- --------------------------------------------------
-- check uri
-- --------------------------------------------------
local uri = ngx.var.uri
local map = "example"
local x, y, z = tile.get_cordination(uri, map, ".png")
if not x then
return ngx.exit(ngx.HTTP_FORBIDDEN)
end
-- check x, y, z range
local max_zoom = 18
local min_zoom = 5
if not tile.check_integrity_xyzm(x, y, z, minz, maxz) then
return ngx.exit(ngx.HTTP_FORBIDDEN)
end
-- check x, y, z supported to generate
local region = data.get_region("japan")
if not osm_tile.is_inside_region(region, x, y, z)
-- try upstream server?
return ngx.exit(ngx.HTTP_FORBIDDEN)
end
-- try renderd file
local tilefile = tile.xyz_to_metatile_filename(x, y, z)
local tilepath = tirex_tilepath.."/"..map.."/"..tilefile
local png, err = tile.get_tile(tilepath, x, y, z)
if png then
ngx.header.content_type = "image/png"
ngx.print(png)
return ngx.OK
end
-- ask tirex to render it
local ok = tirex.send_request(map, x, y, z)
if not ok then
return ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
end
-- get tile image from metatile
local png, err = tile.get_tile(tilepath, x, y, z)
if png then
ngx.header.content_type = "image/png"
ngx.print(png)
return ngx.OK
end
return ngx.exit(ngx.HTTP_NOT_FOUND)
';
}
}
syntax: x, y, z = get_cordination(uri, map, ext)
Retrive x/y/z from uri path. If client GET uri /example/9/3/1.png then example map, z =9, x=3 and y=1 and extension is png.
syntax: filename = osm.tile.xyz_to_metatile_filename(x, y, z)
Generate metatile filename from x/y/z cordination.
syntax: png, err = osm.tile.get_tile(tilepath, x, y, z)
Get chunk of png image data of x/y/z cordination from metatile tilepath.
syntax: ok = osm.tile.check_integrity_xyzm(x, y, z, minz, maxz)
Check whether x/y/z integrity. Tile x/y/z definition details are in https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
syntax: ok = osm.tile.check_integrity_xyzm(x, y, z)
Same as check_integrity_xyzm() but don't check z range.
syntax: include = osm.tile.is_inside_region(region, x, y, z)
Check x/y/z cordination is located and inside of region. region should be get from 'osm.data'
syntax: * region = data.get_region("japan"))*
Get region definition table of argument country/area. This can use for is_inside_region() method.
Now provide following area/country data:
japan
asia
world
syntax: result = osm.tirex.request(map, x, y, z1, z2, priority)
Request enqueue command to rendering map 'map' with x/y/z1 cordination and priority. And also request to render in background between zoom z1 to z2. If request fails return nil.
When z1 == z2, just ask to render single tile.
syntax: result = osm.tirex.cancel(map, x, y, z1, z2, priority)
Request dequeue command to rendering map 'map' with x/y/z1 cordination and priority.And also request to cancel in background between zoom z1 to z2. If request fails return nil.
syntax: result = osm.tirex.ping()
Request ping command. If request fails return nil.
syntax: result = osm.tirex.send_request(map, x, y, z)
Request enqueue command to rendering map 'map' with x/y/z cordination. If request fails return nil.
syntax: result = osm.tirex.enqueue_request(map, x, y, z, priority)
Request enqueue command to rendering map 'map' with x/y/z cordination and priority. If request fails return nil.
syntax: result = osm.tirex.dequeue_request(map, x, y, z, priority)
Request dequeue command to rendering map 'map' with x/y/z cordination and priority. If request fails return nil.
-
build more data definitions
-
and more on issue tracker.
The tile-serving mailing list is for English speakers. It is for all topic about tile serving development of openstreetmap, not only this project.
The osmfj-devel web chat is in Japanese/English. It is a chat room mainly for OSM Japan site and related software development.
Please report bugs or submit patches by
-
creating a ticket on the GitHub Issue Tracker,
-
There are known problem that Tirex cannot response properly so we need to patch to tirex.
https://trac.openstreetmap.org/ticket/4869
If you use Tirex 0.4.1(original) or tirex-0.4.1ppa4 and below, you need to patch to tirex. Here is a patch file in misc/tirex-peer.diff.
Hiroshi Miura [email protected], OpenStreetMap Foundation Japan
Hiroshi Miura, 2013 OpenStreetMap Foundation Japan, 2013
Distributed under GPLv3 License.
- the ngx_lua module: http://wiki.nginx.org/HttpLuaModule
