LUA script engine for speedprofiles about osrm-backend HOT 26 CLOSED

Moving to 0.4

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A first prototype is running here that uses a speedprofile defined by a LUA script. Will be moved to a seperate dev-branch in the near future.

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cool!

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I was thinking today to also experiment with a JavaScript library to see what works best.

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cool. i think js would be easier for a lot of people, since it's so widespread. plus you can use coffeescript :-)

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what's the performance of running lua vs js?

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I haven't run any tests yet, but I suspect that both fair well. I am more thinking of usability and maintainability.

@karme Any objections to using JavaScript?

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i agree usability and maintainability are probably more important that raw speed. but perhaps js offer all three things

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Project OSRM [email protected] writes:

I haven't run any tests yet, but I suspect that both fair well. I am
more thinking of usability and maintainability.

@karme Any objections to using JavaScript?

fine with me

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I must conclude that Googles V8 is a pain after two days of working with it.

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can you say more? hard to compile, bad performance..?

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It is hard to integrate into existing code that was not built with V8 in mind. Also, the amount of additional wrapping code around it is not trivial.

On the other hand, it took half an hour and 15 lines of code to get basic functionality with LUA. I will investigate further what the performance of LUA.

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thanks for explaining.

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I have an internal branch running that does the node parsing through LUA now. LUA works like a charm and I didn’t notice any substantial speed-down.

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To give some feeling how parsing of nodes works, here is the LUA code snippet:

bollards_whitelist = { [""] = true, ["cattle_grid"] = true, ["border_control"] = true, ["toll_booth"] = true, ["no"] = true}
access_whitelist = { ["yes"] = true, ["motorcar"] = true, ["permissive"] = true }
access_blacklist = { ["no"] = true, ["private"] = true, ["agricultural"] = true, ["forestery"] = true }

function node_function (node)
  local barrier = node.tags:Find("barrier")
  local access = node.tags:Find("access")
  local traffic_signal = node.tags:Find("highway")

  if traffic_signal == "traffic_signals" then
    node.traffic_light = true;
  end

  if access_blacklist[barrier] then
    node.bollard = true;
  end

  if not bollards_whitelist[barrier] then
    node.bollard = true;
  end
  return 1
end

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nice, thanks for posting!

i have to admit i personally would much prefer javascript, instead of having to learn and remember yet another (similar, yet different) script language.

i believe js could potentially attract more developers to osrm than lua, since so many people know it, and there's a lot more js code out there than lua. for rubyist, the ability to use coffeescript (which converts to js) would also be an option with js.

but in any case i'm excited to see progress on the new tag parsing system!

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There is some progress to report. Now also ways get parsed through the LUA engine and it looks great. There are only few edges left to tweak to get it fully working. I will push the development branch to the repository later today.

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sweet

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Darn! For some reason, it landed in master branch. But anyway, feel free to give it a try.

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:-)

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looking forward to trying it

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I will close this issue now and would like to encourage everyone to file new issue reports when bugs occur. Of course discussion can also continue here.

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do you envision a lua script for each transport mode - bike, car, foot, etc - added to the repo?

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For the time being seperate profiles for each mode

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Luabind formula has been submitted to homebrew: Homebrew/legacy-homebrew#14914

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For OS X users: Please note that OSRM builds with clang only and that there is still one issue left.

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