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db_wrappers.go
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db_wrappers.go
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// Copyright The OpenTelemetry Authors
//
// 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
//
// https://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 sqlqueryreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/sqlqueryreceiver"
import (
"context"
"database/sql"
)
// These are wrappers and interfaces around sql.DB so that it can be swapped out for testing.
type db interface {
QueryContext(ctx context.Context, query string, args ...any) (rows, error)
}
type rows interface {
ColumnTypes() ([]colType, error)
Next() bool
Scan(dest ...any) error
}
type colType interface {
Name() string
}
type dbWrapper struct {
db *sql.DB
}
func (d dbWrapper) QueryContext(ctx context.Context, query string, args ...any) (rows, error) {
rows, err := d.db.QueryContext(ctx, query, args...)
return rowsWrapper{rows}, err
}
type rowsWrapper struct {
rows *sql.Rows
}
func (r rowsWrapper) ColumnTypes() ([]colType, error) {
types, err := r.rows.ColumnTypes()
if err != nil {
return nil, err
}
var out []colType
for _, columnType := range types {
out = append(out, colWrapper{columnType})
}
return out, nil
}
func (r rowsWrapper) Next() bool {
return r.rows.Next()
}
func (r rowsWrapper) Scan(dest ...any) error {
return r.rows.Scan(dest...)
}
type colWrapper struct {
ct *sql.ColumnType
}
func (c colWrapper) Name() string {
return c.ct.Name()
}