84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
package store
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import (
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"context"
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"errors"
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"github.com/jackc/pgx/v5"
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)
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// InsertMessage creates a new message in a conversation and returns it.
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func (s *Store) InsertMessage(ctx context.Context, conversationID, senderID int64, body string) (*Message, error) {
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var m Message
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err := s.pool.QueryRow(ctx, `
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INSERT INTO messages(conversation_id, sender_id, body)
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VALUES($1, $2, $3)
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RETURNING id, conversation_id, sender_id, body, created_at, edited_at, deleted_at
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`, conversationID, senderID, body).Scan(
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&m.ID, &m.ConversationID, &m.SenderID, &m.Body,
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&m.CreatedAt, &m.EditedAt, &m.DeletedAt,
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)
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if err != nil {
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return nil, err
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}
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return &m, nil
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}
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// GetMessageByID retrieves a message by ID or returns ErrNotFound.
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func (s *Store) GetMessageByID(ctx context.Context, id int64) (*Message, error) {
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var m Message
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err := s.pool.QueryRow(ctx, `
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SELECT id, conversation_id, sender_id, body, created_at, edited_at, deleted_at
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FROM messages WHERE id=$1
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`, id).Scan(
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&m.ID, &m.ConversationID, &m.SenderID, &m.Body,
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&m.CreatedAt, &m.EditedAt, &m.DeletedAt,
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)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return nil, ErrNotFound
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}
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return nil, err
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}
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return &m, nil
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}
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// ListMessages returns messages for a conversation in reverse chronological order.
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// If before > 0, only messages with ID less than before are returned.
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func (s *Store) ListMessages(ctx context.Context, conversationID int64, before int64, limit int) ([]Message, error) {
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var rows pgx.Rows
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var err error
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if before > 0 {
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rows, err = s.pool.Query(ctx, `
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SELECT id, conversation_id, sender_id, body, created_at, edited_at, deleted_at
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FROM messages
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WHERE conversation_id=$1 AND id<$2
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ORDER BY id DESC LIMIT $3
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`, conversationID, before, limit)
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} else {
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rows, err = s.pool.Query(ctx, `
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SELECT id, conversation_id, sender_id, body, created_at, edited_at, deleted_at
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FROM messages
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WHERE conversation_id=$1
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ORDER BY id DESC LIMIT $2
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`, conversationID, limit)
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}
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var msgs []Message
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for rows.Next() {
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var m Message
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if err := rows.Scan(
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&m.ID, &m.ConversationID, &m.SenderID, &m.Body,
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&m.CreatedAt, &m.EditedAt, &m.DeletedAt,
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); err != nil {
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return nil, err
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}
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msgs = append(msgs, m)
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}
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return msgs, nil
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}
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