[OSM-dev] [Merkaartor] Crowd Sourced Testing of OSM 0.6 API

Shaun McDonald Shaun at shaunmcdonald.me.uk
Fri Dec 12 17:20:11 GMT 2008

On 12 Dec 2008, at 15:35, Chris Browet wrote:

> Actually, the problem is that I get zero-sized replies (the 502 is  
> sent by my proxy).
> I guess some have already succeeded in uploading, right? With  
> Merkaartor? (In case it is a local config error)

Looking through all the changesets that have been uploaded, none of  
them have been created by Merkaartor. It should be noted that the dev  
server (using modrails/passenger) is using a slightly different setup  
compared to the production server (using mogrels).

Using Merkaartor against my local server, it does create a changeset,  
however it doesn't manage to update ways due to a bad request.  
Merkaartor seems to be thinking that a bad request means that the  
upload succeeded, by removing it from the dirty layer.

I have discovered the problem why Merkaartor is getting a bad request.  
It is due to where the changeset is placed. I know it is repetitive,  
however the way that the current API 0.6 is implemented, is that each  
node, way or relation that is uploaded, should have a changeset,  
rather than the outer osm element.

You are currently doing (simplified) on a create way upload:
<osm changeset="nn"><way id="0" version="-1880"><nd ref=.../><tag  
k="created_by" v="Merkaartor 0.12"/><tag k=.. v=../></way></osm>

You should make the following changes:
changeset from osm element => way element
version isn't required
when creating an id is not required
the created by tag is no longer required on nodes/ways/relations, as  
it is now on the changeset.
Which means that you end up with:
<osm><way><nd ref=../><tag k=.. v=../></way></osm>

Another issue that I found was that if a node fails to be created, or  
edited then the editor should not try to upload any way that  
references those nodes.

It should be noted that we are starting to return more meaningful  
error messages when errors happen on the API.


> - Chris -
> On Thu, Dec 11, 2008 at 4:27 PM, Shaun McDonald <Shaun at shaunmcdonald.me.uk 
> > wrote:
> According to the server log, it appears to be a 401 Unauthorized  
> that is being returned.
> Could it be that the auth headers aren't being sent properly?
> shaun
> On 11 Dec 2008, at 14:54, Chris Browet wrote:
>> Not too sure if it's Merkaartor or the API (because 0.6 in  
>> Merkaartor was coded by Bart back in June).
>> I receive a "502 - Bad Gateway" when trying to create a changeset,  
>> in a blank area if that matter.
>> I checked the api page and the request seemed fine to me.
>> - Chris -
>> On Thu, Dec 11, 2008 at 12:22 PM, Shaun McDonald <Shaun at shaunmcdonald.me.uk 
>> > wrote:
>> Hi,
>> As the 0.6 XML API is now feature complete, I'd like to start a  
>> push for getting it tested, to iron on the final bugs prior to  
>> going live.
>> Can you all please take a look at the following page to find out  
>> more about testing the 0.6 API:
>> http://wiki.openstreetmap.org/wiki/OSM_Protocol_Version_0.6/Crowd_sourced_Testing
>> And then please put your testing hats on to find the bugs.
>> Shaun
>> _______________________________________________
>> Merkaartor mailing list
>> Merkaartor at openstreetmap.org
>> http://lists.openstreetmap.org/listinfo/merkaartor

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