motiejus/config
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rewrite weather in go

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This commit is contained in:
Motiejus Jakštys 2024-09-15 07:36:17 +03:00
parent 65297845e5
commit 605d340aa0
6 changed files with 142 additions and 56 deletions
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12
flake.nix
View File

@ -94,6 +94,7 @@
deploy-rs-pkg = null;
})
(_: super: {
weather = super.callPackage ./pkgs/weather { };
nicer = super.callPackage ./pkgs/nicer.nix { };
imapsync = super.callPackage ./pkgs/imapsync.nix { };
tmuxbash = super.callPackage ./pkgs/tmuxbash.nix { };
@ -305,19 +306,20 @@
};
formatter = pkgs.nixfmt-rfc-style;
}
)
// {
packages.x86_64-linux.vanta-agent =
// (
let
pkgs = import nixpkgs {
inherit overlays;
system = "x86_64-linux";
};
in
pkgs.vanta-agent;
};
{
packages.x86_64-linux.vanta-agent = pkgs.vanta-agent;
packages.x86_64-linux.weather = pkgs.weather;
}
);
}

4
hosts/fwminex/configuration.nix
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@ -95,8 +95,8 @@ in
bash
];
serviceConfig = {
type = "notify";
ExecStart = "${pkgs.systemd}/bin/systemd-socket-activate -a --inetd -l ${toString myData.ports.exporters.weather} ${../../pkgs/weather/main}";
type = "simple";
ExecStart = "${pkgs.weather}/bin/weather";
ProtectSystem = "strict";
};
};

6
pkgs/weather/default.nix Normal file
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@ -0,0 +1,6 @@
{ buildGoModule }:
buildGoModule {
name = "weather";
src = ./.;
vendorHash = null;
}

3
pkgs/weather/go.mod Normal file
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@ -0,0 +1,3 @@
module git.jakstys.lt/motiejus/config/pkgs/weather
go 1.19

43
pkgs/weather/main
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@ -1,43 +0,0 @@
#!/usr/bin/env bash
set -euo pipefail
STATION=vilniaus-ams
TODAY=${1:-$(date +%F)}
export TZ=UTC
sed -e 's/$/\r/' <<EOF
HTTP/1.0 200 OK
Content-Type: text/plain; version=0.0.4; charset=utf-8; escaping=values
EOF
get() { jq -r ".$1 // 0" <<< "$2"; }
while IFS= read -r obs; do
#{
# "observationTimeUtc": "2024-09-13 12:00:00",
# "airTemperature": 20.9,
# "feelsLikeTemperature": 20.9,
# "windSpeed": 1.4,
# "windGust": 5.7,
# "windDirection": 103,
# "cloudCover": 88,
# "seaLevelPressure": 1010.3,
# "relativeHumidity": 82,
# "precipitation": 0,
# "conditionCode": "rain"
#}
ts=$(date +%s000 --date="$(get observationTimeUtc "$obs")")
cat <<EOF
weather_station_air_temperature_celsius{station="$STATION"} $(get airTemperature "$obs") $ts
weather_station_air_feels_like_celsius{station="$STATION"} $(get feelsLikeTemperature "$obs") $ts
weather_station_wind_speed_ms{station="$STATION"} $(get windSpeed "$obs") $ts
weather_station_wind_gust_ms{station="$STATION"} $(get windGust "$obs") $ts
weather_station_wind_direction_degrees{station="$STATION"} $(get windDirection "$obs") $ts
weather_station_cloud_cover_percent{station="$STATION"} $(get cloudCover "$obs") $ts
weather_station_sea_level_pressure_hpa{station="$STATION"} $(get seaLevelPressure "$obs") $ts
weather_station_relative_humidity_percent{station="$STATION"} $(get relativeHumidity "$obs") $ts
weather_station_precipitation_mm{station="$STATION"} $(get precipitation "$obs") $ts
weather_station_condition{station="$STATION",code="$(get conditionCode "$obs")"} 1 $ts
EOF
done < <(curl -f -s "https://api.meteo.lt/v1/stations/$STATION/observations/$TODAY" | jq -c '.observations[]')

118
pkgs/weather/main.go Normal file
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@ -0,0 +1,118 @@
package main
import (
"bufio"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"text/template"
"time"
)
const (
_listen = ":9011"
_urlTemplate = "https://api.meteo.lt/v1/stations/%s/observations/%s"
_station = "vilniaus-ams"
_promTemplate = `weather_station_air_temperature_celsius{station="{{ .Station }}"} {{ .AirTemperature }} {{ .TS }}
weather_station_air_feels_like_celsius{station="{{ .Station }}"} {{ .FeelsLikeTemperature }} {{ .TS }}
weather_station_wind_speed_ms{station="{{ .Station }}"} {{ .WindSpeed }} {{ .TS }}
weather_station_wind_gust_ms{station="{{ .Station }}"} {{ .WindGust }} {{ .TS }}
weather_station_wind_direction_degrees{station="{{ .Station }}"} {{ .WindDirection }} {{ .TS }}{{ if .CloudCover }}
weather_station_cloud_cover_percent{station="{{ .Station }}"} {{ .CloudCover }} {{ .TS }}{{ end }}
weather_station_sea_level_pressure_hpa{station="{{ .Station }}"} {{ .SeaLevelPressure }} {{ .TS }}
weather_station_relative_humidity_percent{station="{{ .Station }}"} {{ .RelativeHumidity }} {{ .TS }}
weather_station_precipitation_mm{station="{{ .Station }}"} {{ .Precipitation }} {{ .TS }}{{ if .ConditionCode }}
weather_station_condition{station="{{ .Station }}",code="{{ .ConditionCode }}"} 1 {{ .TS }}{{ end }}
`
)
var tpl = template.Must(template.New("prom").Parse(_promTemplate))
func main() {
log.Printf("Listening on %s\n", _listen)
log.Fatal((&http.Server{
Addr: _listen,
Handler: http.HandlerFunc(handler),
}).ListenAndServe())
}
type observation struct {
ObservationTimeUtc string `json:"observationTimeUtc"`
AirTemperature float64 `json:"airTemperature"`
FeelsLikeTemperature float64 `json:"feelsLikeTemperature"`
WindSpeed float64 `json:"windSpeed"`
WindGust float64 `json:"windGust"`
WindDirection float64 `json:"windDirection"`
CloudCover *float64 `json:"cloudCover"`
SeaLevelPressure float64 `json:"seaLevelPressure"`
RelativeHumidity float64 `json:"relativeHumidity"`
Precipitation float64 `json:"precipitation"`
ConditionCode *string `json:"conditionCode"`
// template variables
TS int64
Station string
}
func handler(w http.ResponseWriter, r *http.Request) {
observations, err := getObservations(time.Now().UTC(), _station)
if err != nil {
log.Printf("Error getting observations: %v\n", err)
http.Error(w, fmt.Sprintf("Internal error: %v", err.Error()), 500)
return
}
w.Header().Add("Content-Type", "text/plain; version=0.0.4")
bw := bufio.NewWriter(w)
defer bw.Flush()
for _, observation := range observations {
ts, err := time.ParseInLocation(
time.DateTime,
observation.ObservationTimeUtc,
time.UTC,
)
if err != nil {
log.Printf("error parsing time %q: %v\n", observation.ObservationTimeUtc, err)
return
}
observation.TS = ts.UnixMilli()
observation.Station = _station
if err := tpl.Execute(bw, observation); err != nil {
log.Printf("error executing template: %v", err)
return
}
}
bw.WriteString("\n")
}
func getObservations(date time.Time, station string) ([]observation, error) {
url := fmt.Sprintf(_urlTemplate, station, date.Format(time.DateOnly))
resp, err := http.Get(url)
if err != nil {
return nil, fmt.Errorf("get %q: %w", url, err)
}
defer func() {
io.Copy(io.Discard, resp.Body)
resp.Body.Close()
}()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("got non-200 http status code %d", resp.StatusCode)
}
decoder := json.NewDecoder(resp.Body)
var incoming struct {
Observations []observation `json:"observations"`
}
if err := decoder.Decode(&incoming); err != nil {
return nil, fmt.Errorf("json decode: %w", err)
}
return incoming.Observations, nil
}