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56 lines
1.7 KiB
56 lines
1.7 KiB
package main |
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import ( |
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"context" |
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"database/sql" |
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"errors" |
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) |
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func (db *database) cachePersistently(key string, data []byte) error { |
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return db.cachePersistentlyContext(context.Background(), key, data) |
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} |
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func (db *database) cachePersistentlyContext(ctx context.Context, key string, data []byte) error { |
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if db == nil { |
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return errors.New("database is nil") |
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} |
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_, err := db.execContext(ctx, "insert or replace into persistent_cache(key, data, date) values(@key, @data, @date)", sql.Named("key", key), sql.Named("data", data), sql.Named("date", utcNowString())) |
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return err |
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} |
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func (db *database) retrievePersistentCache(key string) (data []byte, err error) { |
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return db.retrievePersistentCacheContext(context.Background(), key) |
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} |
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func (db *database) retrievePersistentCacheContext(c context.Context, key string) (data []byte, err error) { |
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if db == nil { |
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return nil, errors.New("database is nil") |
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} |
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d, err, _ := db.pc.Do(key, func() (any, error) { |
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if row, err := db.queryRowContext(c, "select data from persistent_cache where key = @key", sql.Named("key", key)); err != nil { |
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return nil, err |
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} else { |
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err = row.Scan(&data) |
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if errors.Is(err, sql.ErrNoRows) { |
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return nil, nil |
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} |
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return data, err |
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} |
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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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if d == nil { |
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return nil, nil |
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} |
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return d.([]byte), nil |
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} |
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func (db *database) clearPersistentCache(pattern string) error { |
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return db.clearPersistentCacheContext(context.Background(), pattern) |
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} |
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func (db *database) clearPersistentCacheContext(c context.Context, pattern string) error { |
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_, err := db.execContext(c, "delete from persistent_cache where key like @pattern", sql.Named("pattern", pattern)) |
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return err |
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}
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