49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
/*
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Copyright 2026.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package postgresql
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import (
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"context"
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"git.ddupan.top/panxiao81/ayatori/internal/database/application"
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)
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// 使用 pg_catalog 限定名称，避免管理账号的 search_path 改变查询来源。
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// 一个语句读取版本和可用列表；ARRAY 子查询在无行时返回空数组，而非 NULL。
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// 不查询 pg_extension：已安装集合不能代表服务器提供的全部扩展。
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const inspectMetadataStatement = `
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SELECT
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pg_catalog.current_setting('server_version'),
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ARRAY(
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SELECT name::text
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FROM pg_catalog.pg_available_extensions
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ORDER BY name
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)`
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func (d *database) InspectMetadata(ctx context.Context) (application.DatabaseMetadata, error) {
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var metadata application.DatabaseMetadata
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err := d.pool.QueryRow(ctx, inspectMetadataStatement).Scan(
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&metadata.Version,
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&metadata.AvailableExtensions,
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)
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if err != nil {
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// 不返回部分结果，也不把查询失败转换为“成功观察到空列表”。
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return application.DatabaseMetadata{}, safeError(err, application.ErrObservation)
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}
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return metadata, nil
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}
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