FEAT: Update Status Of Video Row On Media Convert Update

cms/internal/db/migrations/0003_index_videos_mediaconvert_job_id.down.sql

@@ -0,0 +1 @@
+DROP INDEX videos_mediaconvert_job_id_idx;

cms/internal/db/migrations/0003_index_videos_mediaconvert_job_id.up.sql

@@ -0,0 +1,4 @@
+-- Job state changes arrive keyed by MediaConvert's job id, so every event the
+-- consumer handles is a lookup on this column. Nothing indexed it before: the
+-- column was only ever written, never searched.
+CREATE INDEX videos_mediaconvert_job_id_idx ON videos (mediaconvert_job_id);

cms/internal/db/repositories/errors.go

@@ -0,0 +1,9 @@
+package repositories
+
+import "errors"
+
+// Sentinel errors the repositories return so handlers can tell "there is no
+// such row" from "the query failed", without importing database/sql to do it.
+
+// ErrVideoNotFound reports that no video has the requested id.
+var ErrVideoNotFound = errors.New("video not found")

cms/internal/db/repositories/videos.go

@@ -3,6 +3,7 @@ package repositories
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"fmt"
 	"strings"
 	"thamanyah/cms/v2/internal/models"
@@ -14,6 +15,66 @@ type VideoRepository struct {
 
 var VideoRepo VideoRepository
 
+// UpdateVideoStatusByJobID moves the video a transcoding job belongs to into a
+// new status. It returns ErrVideoNotFound when no video carries that job id,
+// which the consumer treats as a message to drop rather than a fault.
+func (svc VideoRepository) UpdateVideoStatusByJobID(ctx context.Context, jobID string, status models.VideoStatus) error {
+	result, err := svc.SQLDB.ExecContext(ctx, `
+		UPDATE videos
+		SET status = $1, updated_at = now()
+		WHERE mediaconvert_job_id = $2
+	`, string(status), jobID)
+	if err != nil {
+		return err
+	}
+
+	affected, err := result.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if affected == 0 {
+		return ErrVideoNotFound
+	}
+
+	return nil
+}
+
+// GetVideoByID reads one video and the ids of the categories it is filed
+// under. It returns ErrVideoNotFound when no video has that id.
+func (svc VideoRepository) GetVideoByID(ctx context.Context, id string) (models.Video, error) {
+	var v models.Video
+
+	err := svc.SQLDB.QueryRowContext(ctx, `
+		SELECT id, title, description, tags, file_name, storage_key, mediaconvert_job_id, status, size_bytes, created_at, updated_at
+		FROM videos
+		WHERE id = $1
+	`, id).Scan(&v.ID, &v.Title, &v.Description, &v.Tags, &v.FileName, &v.StorageKey,
+		&v.MediaConvertJobID, &v.Status, &v.SizeBytes, &v.CreatedAt, &v.UpdatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return models.Video{}, ErrVideoNotFound
+	}
+	if err != nil {
+		return models.Video{}, err
+	}
+
+	rows, err := svc.SQLDB.QueryContext(ctx,
+		`SELECT category_id FROM video_categories WHERE video_id = $1 ORDER BY category_id`, v.ID)
+	if err != nil {
+		return models.Video{}, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var categoryID int16
+		if err := rows.Scan(&categoryID); err != nil {
+			return models.Video{}, err
+		}
+		v.CategoryIDs = append(v.CategoryIDs, categoryID)
+	}
+
+	return v, rows.Err()
+}
+
 // VideoExistsWithStorageKey reports whether a video has already been
 // registered under a storage key. It is served by videos_storage_key_key, the
 // index Postgres builds for the column's UNIQUE constraint.