Souplesse

This readme describes what may someday be, not what is today

Reads a GPX file which you generated by cycling around, and tells you interesting(sic) things about it.

The principle we aspire to is that the measurement is subsidary to the ride, not the purpose of the ride. The purpose of the ride is to enjoy cycling, or to see new places, or to get from A to B, and the purpose of Souplesse is to see if we can get any useful numbers out of the riding you were doing anyway without making you do more of it.

So, the general idea is that given some ride data it can tell you how long/how often you spent at a given level of effort (e.g. heart rate), or output (power, speed, cadence, rate of ascent).

Canned views

ride view

graph of (selected variables) / time, with buttons to select variables slider for threshold level all points above threshold are highlighted and interval times above threshold shown zoom in/out on time range show the selected points on a map

calendar view

note this will need some kind of server-side storage so that the system remembers all your gpx files

shows dates that you rode for each ride, show time at effort some kind of slider for effort level

Query view

Not yet decided if this is useful, something that allows graphs of arbitrary functions of properties (e.g. to look at power/cadence ratio, or ... some other weirdness)

Tech notes

Use nix-shell. Inside the shell

• run tests with cabal test --test-show-details=always: if you don't ask for details it won't tell you about incomplete pattern matches

• run the app with cabal run

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Do not look below this line

WIP, Puzzles and TODO

• do we even need Track? will it ever be anything more than a collection of Points?

• can we lose this "if isJust lat && isJust lon && isJust ts" wart?

• probably we should store points in a more efficient form than a singly-linked list

• need a web server in haskell that

• [done] accepts file upload and parses the gpx file
• [done] serves the data points in some format elm can digest easily

• [done] need a database of some kind so the data can be saved

• and boring stuff like auth[zn]

• frontend can get data from backend

• [done] for DX, backend can serve the js files needed by frontend

• [ad hoc] we only have yesod-core, may need other parts as well

• [done] detect and refuse uploads which overlap an existing time frame (http 409) so that we can script upload-all-the-tracks.

• could we converge the Point and Trkpt to make sql better?

• calendar displays sessions. a session is a sequence of measurements describing a ride or a race or a trip. we can extract potential sessions from the data by looking for series of points not more than x (10?) minutes apart, but the rider may override that. Consider: I ride solo to the start point of a group ride, join a tandem partner to do the group ride, then ride solo home. There is not necessarily ten minutes between them.

  after a new track is uploaded, we look at all the points covered by draft sessions, and rearrange them to cover the new points. Draft sessions are then presented to the rider who may approve them as-is - perhaps involving other data collection as well ("perceived effort" or "which bike setup was this" or ...) - or chop them up using information thy have but the computer doesn't

in theory we don't even need draft sessions and we could have the rider create sessions from the calendar page or the timeline page. However, that's a GET and might be slow if it has to figure out what all the sessions would be every time someone looks at it. So the draft session is just to precompute that and make the view easier

the summary of a session is for display on the calendar and might change depending on the nature of the training effort. e.g. for a long slow ride we show total distance, for interval training we show time spent in HR zones ...

Postgres

I run the postgresql devel server using Docker instead of changing my global NixOS configuration, so that it's self-contained and I can start and stop it when I want to

docker run -p 5432:5432 --name souplesse-postgres -e POSTGRES_USER=souplesse  -e POSTGRES_PASSWORD=secret -d postgres
nix-shell -p postgresql --run "psql -h localhost -U souplesse   -p 5432"

Sample data

The upload form deliberately doesn't have CSRF (for now, at least) so that you can chuck a bunch of GPX files at it using curl

 for i in tmp/Tracks/*.gpx ; do curl --form  f1=@$i 'http://localhost:3000/upload'; done

This should be safe to do repeatedly because it will refuse upload of tracks where the database already contains any points in the time range of the uploaded track