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reaktor2: add cache to krebsfood hook

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This commit is contained in:
Kierán Meinhardt 2022-10-04 19:16:58 +02:00
parent b5c79e3f77
commit af744fad89
1 changed files with 24 additions and 7 deletions
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31
krebs/2configs/reaktor2.nix
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@ -79,17 +79,34 @@ let
pattern = "18@p";
activate = "match";
command = {
env.radius = toString 250; # metres around c-base to search
env = {
radius = toString 250; # metres around c-base to search
age_threshold = toString (24 * 60 * 60);
state_file = "${stateDir}/krebsfood";
};
filename = pkgs.writeDash "krebsfood" ''
set -efu
expected_max_results=1024 # the upper bound on the number of restaurants
echo '[out:json];node(id:260050809)->.cbase;
(
node(around.cbase:'$radius')[amenity=fast_food];
node(around.cbase:'$radius')[amenity=restaurant];
);out;' \
| ${pkgs.curl}/bin/curl -sSL -d @- -X POST http://overpass-api.de/api/interpreter \
file_age_seconds() {
expr "$(date +%s)" - "$(date +%s -r "$1")"
}
get_restaurants() {
if [ -f "$state_file" ]; then
[ "$(file_age_seconds "$state_file")" -lt "$age_threshold" ] && cat "$state_file"
else
echo '[out:json];node(id:260050809)->.cbase;
(
node(around.cbase:'$radius')[amenity=fast_food];
node(around.cbase:'$radius')[amenity=restaurant];
);out;' \
| ${pkgs.curl}/bin/curl -sSL -d @- -X POST http://overpass-api.de/api/interpreter \
| tee "$state_file"
fi
}
get_restaurants \
| ${pkgs.jq}/bin/jq -r --argjson random "$(shuf -i 0-$expected_max_results -n 1)" '
.elements
| length as $length