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noaa.go
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noaa.go
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package main
import (
"encoding/xml"
"errors"
"fmt"
"io"
"sync"
)
const (
dataSourceMetar = "metars"
dataSourceTaf = "tafs"
)
type outputData struct {
data []byte
err error
}
// NOAAResponseMetar provides struct for XML unmarshalling of NOAA data
type NOAAResponseMetar struct {
XMLName xml.Name `xml:"response"`
Text string `xml:",chardata"`
Xsd string `xml:"xsd,attr"`
Xsi string `xml:"xsi,attr"`
Version string `xml:"version,attr"`
NoNamespaceSchemaLocation string `xml:"noNamespaceSchemaLocation,attr"`
RequestIndex string `xml:"request_index"`
DataSource struct {
Text string `xml:",chardata"`
Name string `xml:"name,attr"`
} `xml:"data_source"`
Request struct {
Text string `xml:",chardata"`
Type string `xml:"type,attr"`
} `xml:"request"`
Errors string `xml:"errors"`
Warnings string `xml:"warnings"`
TimeTakenMs string `xml:"time_taken_ms"`
Data struct {
Text string `xml:",chardata"`
NumResults string `xml:"num_results,attr"`
METAR []struct {
Text string `xml:",chardata"`
RawText string `xml:"raw_text"`
StationID string `xml:"station_id"`
ObservationTime string `xml:"observation_time"`
Latitude string `xml:"latitude"`
Longitude string `xml:"longitude"`
TempC string `xml:"temp_c"`
DewpointC string `xml:"dewpoint_c"`
WindDirDegrees string `xml:"wind_dir_degrees"`
WindSpeedKt string `xml:"wind_speed_kt"`
VisibilityStatuteMi string `xml:"visibility_statute_mi"`
AltimInHg string `xml:"altim_in_hg"`
QualityControlFlags struct {
Text string `xml:",chardata"`
NoSignal string `xml:"no_signal"`
} `xml:"quality_control_flags"`
SkyCondition struct {
Text string `xml:",chardata"`
SkyCover string `xml:"sky_cover,attr"`
} `xml:"sky_condition"`
FlightCategory string `xml:"flight_category"`
MetarType string `xml:"metar_type"`
ElevationM string `xml:"elevation_m"`
} `xml:"METAR"`
} `xml:"data"`
}
// NOAAResponseTaf provides struct for XML unmarshalling of NOAA data
type NOAAResponseTaf struct {
XMLName xml.Name `xml:"response"`
Text string `xml:",chardata"`
Xsd string `xml:"xsd,attr"`
Xsi string `xml:"xsi,attr"`
Version string `xml:"version,attr"`
NoNamespaceSchemaLocation string `xml:"noNamespaceSchemaLocation,attr"`
RequestIndex string `xml:"request_index"`
DataSource struct {
Text string `xml:",chardata"`
Name string `xml:"name,attr"`
} `xml:"data_source"`
Request struct {
Text string `xml:",chardata"`
Type string `xml:"type,attr"`
} `xml:"request"`
Errors string `xml:"errors"`
Warnings string `xml:"warnings"`
TimeTakenMs string `xml:"time_taken_ms"`
Data struct {
Text string `xml:",chardata"`
NumResults string `xml:"num_results,attr"`
TAF []struct {
Text string `xml:",chardata"`
RawText string `xml:"raw_text"`
StationID string `xml:"station_id"`
IssueTime string `xml:"issue_time"`
BulletinTime string `xml:"bulletin_time"`
ValidTimeFrom string `xml:"valid_time_from"`
ValidTimeTo string `xml:"valid_time_to"`
Latitude string `xml:"latitude"`
Longitude string `xml:"longitude"`
ElevationM string `xml:"elevation_m"`
Forecast struct {
Text string `xml:",chardata"`
FcstTimeFrom string `xml:"fcst_time_from"`
FcstTimeTo string `xml:"fcst_time_to"`
WindDirDegrees string `xml:"wind_dir_degrees"`
WindSpeedKt string `xml:"wind_speed_kt"`
VisibilityStatuteMi string `xml:"visibility_statute_mi"`
WxString string `xml:"wx_string"`
SkyCondition struct {
Text string `xml:",chardata"`
SkyCover string `xml:"sky_cover,attr"`
CloudBaseFtAgl string `xml:"cloud_base_ft_agl,attr"`
} `xml:"sky_condition"`
} `xml:"forecast"`
} `xml:"TAF"`
} `xml:"data"`
}
func (env *Env) getData(dataSource string, ICAO string, data chan outputData, wg *sync.WaitGroup) {
var out outputData
defer wg.Done()
url := fmt.Sprintf("%s?dataSource=%s&requestType=retrieve&format=xml&stationString=%s&hoursBeforeNow=%d", urlPrefix, dataSource, ICAO, env.NOAAinterval)
response, err := env.httpClient.Get(url)
if err != nil {
out.err = err
data <- out
close(data)
return
}
buf, err := io.ReadAll(response.Body)
if err != nil {
out.err = err
data <- out
close(data)
return
}
out.data = buf
data <- out
close(data)
}
// ParseMetarNOAA retrieves raw text of latest METAR from NOAA
func ParseMetarNOAA(input []byte) (string, error) {
var nresp NOAAResponseMetar
err := xml.Unmarshal([]byte(input), &nresp)
if err != nil && err != io.EOF {
return "", err
}
// Check if any METARs are available
if len(nresp.Data.METAR) <= 0 {
return "", errors.New("no METAR found")
}
// Return the newest one
return nresp.Data.METAR[0].RawText, nil
}
// ParseTafNOAA retrieves raw text of latest METAR from NOAA
func ParseTafNOAA(input []byte) (string, error) {
var nresp NOAAResponseTaf
err := xml.Unmarshal([]byte(input), &nresp)
if err != nil && err != io.EOF {
return "", err
}
// Check if any METARs are available
if len(nresp.Data.TAF) <= 0 {
return "", errors.New("no TAF found")
}
// Return the newest one
return nresp.Data.TAF[0].RawText, nil
}