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https://github.com/miurahr/lua-nginx-osm
OpenStreetMap extension for Nginx Lua module
https://github.com/miurahr/lua-nginx-osm
Last synced: 3 months ago
JSON representation
OpenStreetMap extension for Nginx Lua module
- Host: GitHub
- URL: https://github.com/miurahr/lua-nginx-osm
- Owner: miurahr
- Created: 2013-05-11T11:30:40.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2014-04-13T23:11:53.000Z (about 10 years ago)
- Last Synced: 2024-01-20T15:43:22.112Z (5 months ago)
- Language: Lua
- Size: 1.38 MB
- Stars: 17
- Watchers: 3
- Forks: 4
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Lists
- awesome-nginx - lua-nginx-osm - OpenStreetMap extension for Nginx Lua module. (Rust Modules / Lua Modules)
- awesome-nginx - lua-nginx-osm - OpenStreetMap extension for Nginx Lua module. (Third Modules / C Modules)
README
Name
====
lua-nginx-osm - Lua Tirex client driver for the ngx_lua based on the cosocket API
Status
======
Current version is 0.43, 21, October, 2013.
This library is considered active development status.
Description
===========
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](https://github.com/chaoslawful/lua-nginx-module/tags) 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.
Synopsis
========
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)
';
}
}
Tile Methods
=======
get_cordination
-----------------
**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.
xyz_to_metatile_filename
-------------------------
**syntax:** *filename = osm.tile.xyz_to_metatile_filename(x, y, z)*
Generate metatile filename from x/y/z cordination.
get_tile
--------
**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.
check_integrity_xyzm
----------------------
**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
check_integrity_xyz
----------------------
**syntax:** *ok = osm.tile.check_integrity_xyzm(x, y, z)*
Same as check_integrity_xyzm() but don't check z range.
is_inside_region
--------
**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'
Data methods
============
**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
Tirex Methods
=======
request
-------------
**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.
cancel
-------------
**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.
ping
-------------
**syntax:** *result = osm.tirex.ping()*
Request ping command. If request fails return nil.
Obsolete functions
=============
send_request
-------------
**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.
enqueue_request
-------------
**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.
dequeue_request
-------------
**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.
TODO
====
* build more data definitions
* and more on issue tracker.
Community
=========
English Mailing List
--------------------
The [tile-serving](https://lists.openstreetmap.org/lists/tile-serving) mailing list is for English speakers.
It is for all topic about tile serving development of openstreetmap, not only this project.
Web Chat
--------------------
The [osmfj-devel](http://lingr.com/signup?letmein=osmfj_devel) web chat is in Japanese/English.
It is a chat room mainly for OSM Japan site and related software development.
Bugs and Patches
================
Please report bugs or submit patches by
1. creating a ticket on the [GitHub Issue Tracker](http://github.com/miurahr/lua-nginx-osm/issues),
1. 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.
Author
======
Hiroshi Miura , OpenStreetMap Foundation Japan
Copyright and License
=====================
Hiroshi Miura, 2013
OpenStreetMap Foundation Japan, 2013
Distributed under GPLv3 License.
See Also
========
* the ngx_lua module: http://wiki.nginx.org/HttpLuaModule
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