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Merge pull request #889 from go-kivik/deleteLosingLeaf
Delete losing leaf properly
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // 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 sqlite | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/go-kivik/kivik/v4/driver" | ||
| "github.com/go-kivik/kivik/v4/internal" | ||
| ) | ||
|
|
||
| func (d *db) Delete(ctx context.Context, docID string, options driver.Options) (string, error) { | ||
| opts := map[string]interface{}{} | ||
| options.Apply(opts) | ||
| optRev, ok := opts["rev"].(string) | ||
| if !ok { | ||
| // Special case: No rev for DELETE is always a conflict, since you can't | ||
| // delete a doc without a rev. | ||
| return "", &internal.Error{Status: http.StatusConflict, Message: "conflict"} | ||
| } | ||
| delRev, err := parseRev(optRev) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| data, err := prepareDoc(docID, map[string]interface{}{"_deleted": true}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| tx, err := d.db.BeginTx(ctx, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer tx.Rollback() | ||
|
|
||
| var found bool | ||
| err = tx.QueryRowContext(ctx, fmt.Sprintf(` | ||
| SELECT child.id IS NULL | ||
| FROM %[2]q AS rev | ||
| LEFT JOIN %[2]q AS child ON rev.id = child.id AND rev.rev = child.parent_rev AND rev.rev_id = child.parent_rev_id | ||
| JOIN %[1]q AS doc ON rev.id = doc.id AND rev.rev = doc.rev AND rev.rev_id = doc.rev_id | ||
| WHERE rev.id = $1 | ||
| AND rev.rev = $2 | ||
| AND rev.rev_id = $3 | ||
| `, d.name, d.name+"_revs"), data.ID, delRev.rev, delRev.id).Scan(&found) | ||
| switch { | ||
| case errors.Is(err, sql.ErrNoRows): | ||
| return "", &internal.Error{Status: http.StatusNotFound, Message: "not found"} | ||
| case err != nil: | ||
| return "", err | ||
| } | ||
| if !found { | ||
| return "", &internal.Error{Status: http.StatusConflict, Message: "conflict"} | ||
| } | ||
| var r revision | ||
| err = tx.QueryRowContext(ctx, fmt.Sprintf(` | ||
| INSERT INTO %[1]q (id, rev, rev_id, parent_rev, parent_rev_id) | ||
| SELECT $1, COALESCE(MAX(rev),0) + 1, $2, $3, $4 | ||
| FROM %[1]q | ||
| WHERE id = $1 | ||
| RETURNING rev, rev_id | ||
| `, d.name+"_revs"), data.ID, data.RevID, delRev.rev, delRev.id).Scan(&r.rev, &r.id) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| _, err = tx.ExecContext(ctx, fmt.Sprintf(` | ||
| INSERT INTO %[1]q (id, rev, rev_id, doc, deleted) | ||
| VALUES ($1, $2, $3, $4, TRUE) | ||
| `, d.name), data.ID, r.rev, r.id, data.Doc) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return r.String(), tx.Commit() | ||
| } |
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