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documents.go
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documents.go
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// Copyright 2021 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"context"
"database/sql"
"github.com/apigee/registry-experimental/server/search/internal/storage/models"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type DocumentRows struct {
Rows []models.Document
}
func (s *DocumentRows) Append(rows *sql.Rows) error {
for rows.Next() {
var row models.Document
if err := rows.Scan(&row.Key, &row.Raw); err != nil {
return err
}
s.Rows = append(s.Rows, row)
}
return nil
}
func (d *Client) UpdateDocuments(ctx context.Context, documents []*models.Document) error {
for _, x := range documents {
if x.IsEmpty() {
if err := d.DeleteDocument(ctx, x); err != nil {
return err
}
} else {
if err := d.SaveDocument(ctx, x); err != nil {
return err
}
}
}
return nil
}
func (d *Client) DeleteDocument(ctx context.Context, document *models.Document) error {
q := d.NewQuery(models.DocumentEntityName)
q = q.Require("Key", document.Key)
if err := d.Delete(ctx, q); err != nil {
return status.Error(codes.Internal, err.Error())
}
return nil
}
func (d *Client) SaveDocument(ctx context.Context, document *models.Document) error {
if err := d.PutDocument(ctx, document); err != nil {
return status.Error(codes.Internal, err.Error())
}
return nil
}
const textSearchQuery = `
SELECT
key, ts_headline(raw, q, 'StartSel="**", StopSel="**"') as excerpt
FROM (
SELECT
key, raw, ts_rank(vector, q) as rank, q
FROM
documents, plainto_tsquery(?) q
WHERE
vector @@ q
ORDER BY
rank DESC
) AS subquery_because_ts_headline_is_expensive_and_subquery_needs_a_name
`
func (d *Client) ListDocuments(ctx context.Context, query string) (*DocumentRows, error) {
var rows DocumentRows
if err := d.Raw(ctx, &rows, textSearchQuery, query); err != nil {
return nil, err
}
return &rows, nil
}