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34 lines
1004 B
34 lines
1004 B
package main |
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import ( |
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"database/sql" |
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"time" |
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) |
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func (db *database) cachePersistently(key string, data []byte) error { |
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date, _ := toLocal(time.Now().String()) |
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_, err := db.exec("insert or replace into persistent_cache(key, data, date) values(@key, @data, @date)", sql.Named("key", key), sql.Named("data", data), sql.Named("date", date)) |
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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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d, err, _ := db.pc.Do(key, func() (interface{}, error) { |
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if row, err := db.queryRow("select data from persistent_cache where key = @key", sql.Named("key", key)); err == sql.ErrNoRows { |
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return nil, nil |
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} else if 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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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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return d.([]byte), nil |
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} |
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func (db *database) clearPersistentCache(pattern string) error { |
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_, err := db.exec("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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