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package cmd
import (
"context"
"fmt"
"os"
"strings"
"time"
"bnbl.io/wx/metar"
"github.com/spf13/cobra"
)
// wx metar --past 1h kbos
// wx metar --past 3h kbos kbed
// wx metar --past 1h @MA
// wx metar --since yesterday --until now kbos
// wx metar --since yesterday --until now --rect 0,0,1,1
// wx metar --past 1h --rect 0,0,1,1
// wx metar --past 1h --radial 90,0,0
// wx metar --past 6h --most-recent-by-station=constraint --path-dist 50 --waypoint ksea --waypoint kbos --min-dist 3
type relTime struct {
t time.Time
}
func (t *relTime) String() string {
return t.t.String()
}
func (t *relTime) Set(s string) (err error) {
// first, see if s is a duration that we can use relative to now, e.g.
// "--since 3d" means since 3 days ago.
if d, err := time.ParseDuration(s); err == nil {
t.t = time.Now().Add(-1 * d)
return nil
}
// next, try to parse it in a series of formats
t.t, err = time.Parse("2006-01-02T15:04:05", s)
return
}
func (t *relTime) Type() string {
return "relative time"
}
type rectangle struct {
minLat, minLon, maxLat, maxLon float64
}
func (r *rectangle) String() string {
return fmt.Sprintf("%f,%f,%f,%f", r.minLat, r.minLon, r.maxLat, r.maxLon)
}
func (r *rectangle) Set(s string) error {
n, err := fmt.Sscanf(s, "%f,%f,%f,%f", &r.minLat, &r.minLon, &r.maxLat, &r.maxLon)
if err != nil {
return err
}
if n != 4 {
return fmt.Errorf("excpected 4 values but got %d", n)
}
return nil
}
func (r *rectangle) Type() string {
return "rect"
}
func (r *rectangle) IsZero() bool {
return r.minLat == 0 && r.minLon == 0 && r.maxLat == 0 && r.maxLon == 0
}
type ring struct {
radius, lat, lon float64
}
func (r *ring) String() string {
return fmt.Sprintf("%f,%f,%f", r.radius, r.lat, r.lon)
}
func (r *ring) Set(s string) error {
n, err := fmt.Sscanf(s, "%f,%f,%f", &r.radius, &r.lat, &r.lon)
if err != nil {
return err
}
if n != 3 {
return fmt.Errorf("expected a radius, lat, and lon, but got %d values", n)
}
return nil
}
func (r *ring) Type() string {
return "radial"
}
func (r *ring) IsZero() bool {
return r.radius == 0 && r.lat == 0 && r.lon == 0
}
var (
since, until relTime
past time.Duration
mostRecentByStation string
mostRecent bool
rect rectangle
radial ring
pathDist float64
waypoints []string
minDist float64
)
func init() {
rootCmd.AddCommand(metarCmd)
// time constraints
metarCmd.Flags().Var(
&since, "since",
`Starting time for METARs (e.g. "2020-01-01T01:31:00" or "3h"), used in
conjunction with --until`)
metarCmd.Flags().Var(
&until, "until",
`Ending time for METARs (e.g. "2020-01-01T01:31:00" or "3h"), used in
conjunction with --since`)
metarCmd.Flags().DurationVar(
&past, "past", time.Hour,
`Duration to retrieve METARs since (e.g. "3h")`)
// location constraints
metarCmd.Flags().Var(
&rect, "rect",
`A lat-lon rect to search within (minLat,minLon,maxLat,maxLon) e.g.
"40,-71,41,-70"`)
metarCmd.Flags().Var(
&radial, "radial",
`A distance around a radius to search within (dist,centerLat,centerLon)
e.g. "3.5,40,-71"`)
metarCmd.Flags().Float64Var(
&pathDist, "path-dist", 0,
"The distance along the flight path to search METARs for")
metarCmd.Flags().StringSliceVar(
&waypoints, "waypoint", []string{},
`Multiple waypoint arguments specify the waypoints that make up a flight
path, ordered from origin to destination. They may be specified as ICAO
identifiers e.g. "KBOS", or as lon-lat pairs, e.g. "-71,40".`)
metarCmd.Flags().Float64Var(
&minDist, "min-dist", 0,
`The minimum distance in degrees latitude or longitude between stations
reported. A higher value results in less dense results.`)
// result count limiting
metarCmd.Flags().StringVar(
&mostRecentByStation, "most-recent-by-station", "constraint",
`Method for fetching most recent for each station ("constraint",
"postfilter", "false")`)
metarCmd.Flags().BoolVar(
&mostRecent, "most-recent", false,
`Only fetch the single most recently-issued METAR of all the selected
stations`)
}
var metarCmd = &cobra.Command{
Use: "metar",
Short: "Fetch METARs",
Long: "Fetch METARs matching the supplied criteria from the TDS",
Run: func(cmd *cobra.Command, args []string) {
reqArgs := []func(*metar.Request){}
if len(args) > 0 {
reqArgs = append(reqArgs, metar.StationString(strings.Join(args, " ")))
}
if !since.t.IsZero() || !until.t.IsZero() {
reqArgs = append(reqArgs, metar.TimeRange(since.t, until.t))
} else if dur, _ := cmd.Flags().GetDuration("past"); dur > 0 {
reqArgs = append(reqArgs, metar.HoursBeforeNow(dur.Hours()))
}
if mostRecent {
reqArgs = append(reqArgs, metar.MostRecent(true))
} else if mostRecentByStation != "" {
reqArgs = append(reqArgs, metar.MostRecentForEachStation(mostRecentByStation))
}
if !rect.IsZero() {
reqArgs = append(reqArgs, metar.LonLatRect(rect.minLat, rect.minLon, rect.maxLat, rect.maxLon))
}
if !radial.IsZero() {
reqArgs = append(reqArgs, metar.RadialDistance(radial.radius, radial.lat, radial.lon))
}
if pathDist > 0 && len(waypoints) > 0 {
reqArgs = append(reqArgs, metar.FlightPath(pathDist, waypoints...))
}
if minDist > 0 {
reqArgs = append(reqArgs, metar.MinDegreeDistance(minDist))
}
var mc metar.Client
res, err := mc.GetMETARs(context.Background(), metar.NewRequest(reqArgs...))
if err != nil {
fmt.Fprintf(os.Stderr, "could not get metar: %v\n", err)
os.Exit(1)
}
if len(res.Errors) > 0 {
for _, err := range res.Errors {
fmt.Fprintf(os.Stderr, "error: %s\n", err)
}
os.Exit(2)
}
for _, m := range res.Data.METARs {
fmt.Printf("%s\n", strings.TrimSpace(m.RawText))
}
},
}
|
