Eric Rakestraw
d9474b5a5b
- fix dispatch route compilation so empty Kinds matches all (nil), not none - introduce internal/sources/common/HTTPSource to centralize HTTP polling boilerplate: - standard cfg parsing (url + user_agent) - default HTTP client + Accept/User-Agent headers - consistent error wrapping - refactor observation sources (nws/openmeteo/openweather) to use HTTPSource - upstream generic HTTP fetch/limits/timeout helper from weatherfeeder to feedkit: - move internal/sources/common/http.go -> feedkit/transport/http.go - keep behavior: status checks, max-body limit, default timeout
120 lines
3.4 KiB
Go
120 lines
3.4 KiB
Go
// FILE: ./internal/sources/openmeteo/observation.go
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package openmeteo
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"time"
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"gitea.maximumdirect.net/ejr/feedkit/config"
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"gitea.maximumdirect.net/ejr/feedkit/event"
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"gitea.maximumdirect.net/ejr/weatherfeeder/internal/providers/openmeteo"
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"gitea.maximumdirect.net/ejr/weatherfeeder/internal/sources/common"
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"gitea.maximumdirect.net/ejr/weatherfeeder/internal/standards"
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)
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// ObservationSource polls an Open-Meteo endpoint and emits one RAW Observation Event.
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type ObservationSource struct {
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http *common.HTTPSource
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}
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func NewObservationSource(cfg config.SourceConfig) (*ObservationSource, error) {
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const driver = "openmeteo_observation"
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// We require params.user_agent for uniformity across sources (even though Open-Meteo
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// itself does not strictly require a special User-Agent).
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hs, err := common.NewHTTPSource(driver, cfg, "application/json")
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if err != nil {
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return nil, err
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}
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return &ObservationSource{http: hs}, nil
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}
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func (s *ObservationSource) Name() string { return s.http.Name }
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func (s *ObservationSource) Kind() event.Kind { return event.Kind("observation") }
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// Poll fetches Open-Meteo "current" and emits exactly one RAW Event.
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func (s *ObservationSource) Poll(ctx context.Context) ([]event.Event, error) {
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raw, meta, err := s.fetchRaw(ctx)
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if err != nil {
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return nil, err
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}
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eventID := buildEventID(s.http.Name, meta)
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if strings.TrimSpace(eventID) == "" {
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// Extremely defensive fallback: keep the envelope valid no matter what.
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eventID = fmt.Sprintf("openmeteo:current:%s:%s", s.http.Name, time.Now().UTC().Format(time.RFC3339Nano))
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}
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var effectiveAt *time.Time
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if !meta.ParsedTimestamp.IsZero() {
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t := meta.ParsedTimestamp.UTC()
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effectiveAt = &t
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}
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return common.SingleRawEvent(
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s.Kind(),
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s.http.Name,
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standards.SchemaRawOpenMeteoCurrentV1,
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eventID,
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effectiveAt,
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raw,
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)
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}
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// ---- RAW fetch + minimal metadata decode ----
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type openMeteoMeta struct {
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Latitude float64 `json:"latitude"`
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Longitude float64 `json:"longitude"`
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Timezone string `json:"timezone"`
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UTCOffsetSeconds int `json:"utc_offset_seconds"`
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Current struct {
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Time string `json:"time"`
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} `json:"current"`
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ParsedTimestamp time.Time `json:"-"`
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}
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func (s *ObservationSource) fetchRaw(ctx context.Context) (json.RawMessage, openMeteoMeta, error) {
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raw, err := s.http.FetchJSON(ctx)
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if err != nil {
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return nil, openMeteoMeta{}, err
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}
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var meta openMeteoMeta
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if err := json.Unmarshal(raw, &meta); err != nil {
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// If metadata decode fails, still return raw; envelope will fall back to computed ID without EffectiveAt.
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return raw, openMeteoMeta{}, nil
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}
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// Best effort: compute a stable EffectiveAt + event ID component.
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// If parsing fails, we simply omit EffectiveAt and fall back to time.Now() in buildEventID.
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if t, err := openmeteo.ParseTime(meta.Current.Time, meta.Timezone, meta.UTCOffsetSeconds); err == nil {
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meta.ParsedTimestamp = t.UTC()
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}
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return raw, meta, nil
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}
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func buildEventID(sourceName string, meta openMeteoMeta) string {
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locKey := ""
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if meta.Latitude != 0 || meta.Longitude != 0 {
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locKey = fmt.Sprintf("coord:%.5f,%.5f", meta.Latitude, meta.Longitude)
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} else {
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locKey = "loc:unknown"
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}
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ts := meta.ParsedTimestamp
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if ts.IsZero() {
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ts = time.Now().UTC()
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}
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return fmt.Sprintf("openmeteo:current:%s:%s:%s", sourceName, locKey, ts.Format(time.RFC3339Nano))
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}
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