using Python to access brouter algorithm

[Bryan Keith]

Hello,

I've read through this forum and done some web searches with no luck.

I'd like to get results from the brouter algorithm via Python -- for example, send a couple lat-lon pairs and return a route with distance, elevation, and bicycle travel time estimate.  Is this possible?  What's the best way to accomplish this?

Do I need to install brouter web app on localhost?  Is an API available for the live servers?  Are there Python packages?  I feel like a web installation shouldn't be necessary at all, yet it seems like maybe it is (but it's not 'cause I have brouter working offline with osmand on android).

Thank you for your help,

Bryan

[Norbert Renner]

The simplest option is probably to start BRouter as a HTTP server on localhost and send requests to that from Python, either by using the server part of the BRouter-Web standalone zip or building and starting from source:

https://github.com/nrenner/brouter-web/blob/master/INSTALL.md#install-standalone-zip-client-and-server

https://github.com/abrensch/brouter#brouter-on-windowslinuxmac-os

See URL documentation here:

https://github.com/abrensch/brouter/blob/56b4263107296de29a851a0e7b0aff7027eb3c50/brouter-server/src/main/java/btools/server/request/ServerHandler.java#L16-L33

There is no public API service. Android apps call the Android Intent service interface:

https://github.com/abrensch/brouter/blob/master/brouter-routing-app/src/main/java/btools/routingapp/IBRouterService.aidl

We don't provide any packages or bindings for Python. In theory, there might be some general options to call Java from Python or to run Python scripts in a compatible Java runtime, but I personally have no experience using those with BRouter and there is also no documentation for embedding BRouter:

https://duckduckgo.com/?q=call+java+from+python

https://www.graalvm.org/python/

[Norbert Renner]

There also is/was a command line call that writes the result to a file, but I don't know if that's actually still working:

https://github.com/abrensch/brouter/blob/8234293e5aa3a35bb4b2cd50d13355eb1922af4f/brouter-server/src/main/java/btools/server/BRouter.java#L95

[Bryan Keith]

Ok, Norbert,

Thank you for the response.  I'll look into those options.

Bryan

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