File/package naming convention conforming better to go standards - as ugly as it is

internal/fetcher/worker_findatender.go

@@ -0,0 +1,52 @@
+package fetcher
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"git.avsdev.uk/Go/job-search/internal/config"
+	"git.avsdev.uk/Go/job-search/internal/findatender"
+	"git.avsdev.uk/Go/job-search/internal/types"
+	"git.avsdev.uk/Go/job-search/internal/util"
+)
+
+// runFindAOpportunity polls Find a Tender every configured interval until ctx
+// is cancelled.
+func runFindAOpportunity(
+	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
+) error {
+	w := util.Worker{
+		Name:     "FindAOpportunity",
+		Interval: conf.Sources.FindATender.Interval,
+		Task: func(ctx context.Context, since time.Time) error {
+			return fetchFindAOpportunity(ctx, conf, since)
+		},
+	}
+	return w.Run(ctx, since)
+}
+
+// fetchFindAOpportunity fetches everything updated since since from Find a
+// Tender. Finding nothing returns ErrNoNewReleases, so the worker still moves
+// its checkpoint on.
+func fetchFindAOpportunity(
+	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
+) error {
+	opportunities, err := util.AwaitTask(ctx, func() ([]*types.Opportunity, error) {
+		ft := findatender.New(conf, conf.Sources.FindATender.APIRoot)
+		defer ft.Shutdown()
+		return ft.With(ctx).FetchAll(since, true)
+	})
+	if errors.Is(err, findatender.ErrNoReleases) {
+		return ErrNoNewReleases
+	}
+	if err != nil {
+		return err
+	}
+
+	slog.Info(fmt.Sprintf("Found %d opportunities", len(opportunities)))
+
+	return nil
+}