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script.go
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script.go
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package canada
import (
"context"
"errors"
"fmt"
"math"
"sync"
"github.com/whitewater-guide/gorge/core"
"golang.org/x/text/encoding/charmap"
)
type optionsCanada struct {
Provinces string `desc:"Comma-separated list of province codes"`
}
type scriptCanada struct {
name string
baseURL string
numWokers int
provinces map[string]bool
core.LoggingScript
}
func (s *scriptCanada) ListGauges() (result core.Gauges, err error) {
err = core.Client.StreamCSV(
s.baseURL+"/doc/hydrometric_StationList.csv",
func(row []string) error {
g, err := s.gaugeFromRow(row)
if err != nil {
s.GetLogger().Error(fmt.Errorf("failed to convert row to gauge: %w", err))
}
if _, ok := s.provinces[row[4]]; err == nil && ok {
result = append(result, *g)
}
return nil
},
core.CSVStreamOptions{
NumColumns: 6,
HeaderHeight: 1,
Decoder: charmap.Windows1252.NewDecoder(),
},
)
return
}
func (s *scriptCanada) Harvest(ctx context.Context, recv chan<- *core.Measurement, errs chan<- error, codes core.StringSet, since int64) {
defer close(recv)
defer close(errs)
// Sometimes gauge list would contain main gauge, but measurements list would contain auxiliary gauge for it or vise versa.
// Auxiliary gauges are marked with X character, main gauges have 0. Some gauges have 1, I dont't know what it means
// I could not find any documentation on this, so I know this by trial and error
remapCodes := make(map[string]string)
if len(codes) > 0 {
for code := range codes {
code2 := getPairedGauge(code)
if _, ok := codes[code2]; !ok && code2 != code {
remapCodes[code2] = code
}
}
}
jobsCh := make(chan string, len(s.provinces))
resultsCh := make(chan *core.Measurement, len(s.provinces))
var wg sync.WaitGroup
numWorkers := s.numWokers
if numWorkers == 0 {
numWorkers = int(math.Min(3, float64(len(s.provinces))))
}
for i := 0; i < numWorkers; i++ {
wg.Add(1)
go s.provinceWorker(ctx, jobsCh, resultsCh, &wg)
}
for prov := range s.provinces {
jobsCh <- prov
}
close(jobsCh)
go func() {
wg.Wait()
close(resultsCh)
}()
for m := range resultsCh {
if code2, ok := remapCodes[m.GaugeID.Code]; ok {
m.GaugeID.Code = code2
}
recv <- m
}
}
func (s *scriptCanada) provinceWorker(ctx context.Context, provinces <-chan string, results chan<- *core.Measurement, wg *sync.WaitGroup) {
for province := range provinces {
logger := s.GetLogger().WithField("province", province)
var m *core.Measurement
err := core.Client.StreamCSV(
fmt.Sprintf("%s/csv/%s/hourly/%s_hourly_hydrometric.csv", s.baseURL, province, province),
func(row []string) error {
select {
case <-ctx.Done():
return fmt.Errorf("context canceled: %w", ctx.Err())
default:
var e error
m, e = s.measurementFromRow(row)
if e == nil {
results <- m
}
if e != nil {
logger.Error(core.WrapErr(e, "province worker error"))
}
}
return nil
},
core.CSVStreamOptions{
NumColumns: 10,
HeaderHeight: 1,
Decoder: charmap.Windows1252.NewDecoder(),
},
)
if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
break
}
}
wg.Done()
}