Using locally-compiled graphhopper-web with locally-compiled graphhopper-maps

Open Source Routing Engine
1

Hi all. I have forked and compiled both graphhopper and graphhopper-maps to make some minor edits for a custom set-up I’m making. I have successfully edited and compiled the changes I’d like to both (graphhopper: use traffic speed data I have access to, graphhopper-maps: add our in-house backdrop mapping). My problem is that I can’t get the two to work together.

Here is what I have done so far:

graphhopper-maps
I’ve added the backdrop maps I needed, which was pretty straightforward. When I run npm run serve and go to localhost:3000 I see the desired changes. I have then run npm run build.

I have added a .npmignore containing the following:

/.idea
/.vscode
*.iml
*~

(This was required to get /dist and config.js to be included in the packing during graphhopper-web-bundle compile)

graphhopper
In web-bundle/pom.xml I have replaced the section

<execution>
  <id>download graphhopper maps<\id>
  ...
</execution>

with the following

<execution>
  <id>download graphhopper maps</id>
  <phase>generate-resources</phase>
  <goals>
    <goal>npm</goal>
  </goals>
  <configuration>
    <arguments>
      pack --pack-destination=${basedir}/target
      /path/to/my/local/graphhopper-maps/
    </arguments>
  </configuration>
</execution>

and also replaced the section

<execution>
  <id>unzip maps bundle<\id>
  ...
</execution>

with the following

<execution>
  <id>unzip maps bundle</id>
  <phase>process-resources</phase>
  <configuration>
    <target>
      <untar compression="gzip"
          src="${basedir}/target/graphhopper-maps-0.7.tgz"
          dest="${basedir}/target/classes/com/graphhopper/maps">
        <patternset>
          <include name="package/dist/**"/>
        </patternset>
        <mapper type="regexp" from="package\/dist\/(.*)" to="\1"/>
      </untar>
    </target>
  </configuration>
  <goals>
    <goal>run</goal>
  </goals>
</execution>

When I do a mvn clean install of graphhopper, I can see that my version of graphhopper-maps gets compressed to web-bundle/target/graphhopper-maps-0.7.tgz as expected, but then when I use the compiled graphhopper-web.jar (which I believe includes web-bundle…?) to start the GraphHopper server, it is still using the “default” version of graphhopper-web, i.e. without the backdrop map options I’ve added.

I can’t find any other reference among the poms pointing to the remote version of graphhopper-maps so I’m very confused why I’m not seeing my local edited version of graphhopper-maps as part of graphhopper-web.

Any pointers on what I’m missing would be gratefully received. I’m new to both Java and JavaScript so very aware that I might not be understanding how the dependencies are working.

Thanks.

2

Well, the easiest you can do is simply start your modified GraphHoppper Maps app as a separate process and make it use your custom GraphHopper server as backend by setting the local url in your config-local.js file. But you would rather like to include the modified maps app in the GraphHopper server jar?

3

Hi easbar. Thanks, yes, I think that was what I was going to do if I couldn’t find a neater solution, but ideally I’d like to have a set-up which is as easy to initialise as the “out of the box” GraphHopper is, because it’s going to be run by different colleagues on different local systems…

4

First thing I would do is making absolutely sure that your browser is not caching the old version (reload the page, clear the cache, use a private window etc.). Next thing I would do is opening the jar (it is just a zip archive) to make sure your modified JavaScript files ended up at the correct location.

graphhopper-web.jar (which I believe includes web-bundle…?)

Yes, web/target/graphhopper-web-9.0-SNAPSHOT.jar is a super-jar that includes the web-bundle jar.

5

Hi easbar. Thank you. You were right that it was my browser caching an old version… Rookie error! Thanks so much for your help!

6

Glad to hear you made it work. Btw can you share any details about how you are using traffic with GraphHopper? Usually it is a challenge to find the OSM ways / GH edges that correspond to the given traffic information.

7

Hi easbar, sorry I somehow missed your last question!

I’m actually not using OSM data, I’m using an in-house network dataset for which we already have traffic speed information

8

Ok thanks!

9

I’m looking to make changes to graphhopper-maps and graphhopper. Just trying to confirm how to bundle both together and test. Is this documented anywhere? Thanks!

10

I think you already came to the right place, did you try @tompeterken-os solution above?