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conn.go
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conn.go
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/*
Copyright 2020 The Vitess 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
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 fakevtsql
import (
"context"
"database/sql/driver"
"errors"
"fmt"
"strings"
"github.com/stretchr/testify/assert"
"vitess.io/vitess/go/vt/topo/topoproto"
"vitess.io/vitess/go/vt/vtadmin/vtadminproto"
vtadminpb "vitess.io/vitess/go/vt/proto/vtadmin"
)
var (
// ErrConnClosed is returend when attempting to query a closed connection.
// It is the identical message to vtsql.ErrConnClosed, but redefined to
// prevent an import cycle in package vtsql's tests.
ErrConnClosed = errors.New("use of closed connection")
// ErrUnrecognizedQuery is returned when QueryCnotext is given a query
// string the mock is not set up to handle.
ErrUnrecognizedQuery = errors.New("unrecognized query")
)
type conn struct {
tablets []*vtadminpb.Tablet
shouldErr bool
}
var (
_ driver.Conn = (*conn)(nil)
_ driver.QueryerContext = (*conn)(nil)
)
func (c *conn) Begin() (driver.Tx, error) {
return nil, nil
}
func (c *conn) Close() error {
return nil
}
func (c *conn) Prepare(query string) (driver.Stmt, error) {
return nil, nil
}
func (c *conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
if c.shouldErr {
return nil, assert.AnError
}
if c == nil {
return nil, ErrConnClosed
}
switch strings.ToLower(query) {
case "show vitess_tablets", "show tablets":
columns := []string{"Cell", "Keyspace", "Shard", "TabletType", "ServingState", "Alias", "Hostname", "PrimaryTermStartTime"}
vals := [][]any{}
for _, tablet := range c.tablets {
vals = append(vals, []any{
tablet.Tablet.Alias.Cell,
tablet.Tablet.Keyspace,
tablet.Tablet.Shard,
topoproto.TabletTypeLString(tablet.Tablet.Type),
vtadminproto.TabletServingStateString(tablet.State),
topoproto.TabletAliasString(tablet.Tablet.Alias),
tablet.Tablet.Hostname,
"", // (TODO:@amason) use real values here
})
}
return &rows{
cols: columns,
vals: vals,
pos: 0,
closed: false,
}, nil
}
return nil, fmt.Errorf("%w: %q %v", ErrUnrecognizedQuery, query, args)
}