vitess.io/vitess@v0.16.2/go/vt/vtadmin/vtsql/fakevtsql/conn.go (about)

     1  /*
     2  Copyright 2020 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package fakevtsql
    18  
    19  import (
    20  	"context"
    21  	"database/sql/driver"
    22  	"errors"
    23  	"fmt"
    24  	"strings"
    25  
    26  	"github.com/stretchr/testify/assert"
    27  
    28  	"vitess.io/vitess/go/vt/topo/topoproto"
    29  	"vitess.io/vitess/go/vt/vtadmin/vtadminproto"
    30  
    31  	vtadminpb "vitess.io/vitess/go/vt/proto/vtadmin"
    32  )
    33  
    34  var (
    35  	// ErrConnClosed is returend when attempting to query a closed connection.
    36  	// It is the identical message to vtsql.ErrConnClosed, but redefined to
    37  	// prevent an import cycle in package vtsql's tests.
    38  	ErrConnClosed = errors.New("use of closed connection")
    39  	// ErrUnrecognizedQuery is returned when QueryCnotext is given a query
    40  	// string the mock is not set up to handle.
    41  	ErrUnrecognizedQuery = errors.New("unrecognized query")
    42  )
    43  
    44  type conn struct {
    45  	tablets   []*vtadminpb.Tablet
    46  	shouldErr bool
    47  }
    48  
    49  var (
    50  	_ driver.Conn           = (*conn)(nil)
    51  	_ driver.QueryerContext = (*conn)(nil)
    52  )
    53  
    54  func (c *conn) Begin() (driver.Tx, error) {
    55  	return nil, nil
    56  }
    57  
    58  func (c *conn) Close() error {
    59  	return nil
    60  }
    61  
    62  func (c *conn) Prepare(query string) (driver.Stmt, error) {
    63  	return nil, nil
    64  }
    65  
    66  func (c *conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
    67  	if c.shouldErr {
    68  		return nil, assert.AnError
    69  	}
    70  
    71  	if c == nil {
    72  		return nil, ErrConnClosed
    73  	}
    74  
    75  	switch strings.ToLower(query) {
    76  	case "show vitess_tablets", "show tablets":
    77  		columns := []string{"Cell", "Keyspace", "Shard", "TabletType", "ServingState", "Alias", "Hostname", "PrimaryTermStartTime"}
    78  		vals := [][]any{}
    79  
    80  		for _, tablet := range c.tablets {
    81  			vals = append(vals, []any{
    82  				tablet.Tablet.Alias.Cell,
    83  				tablet.Tablet.Keyspace,
    84  				tablet.Tablet.Shard,
    85  				topoproto.TabletTypeLString(tablet.Tablet.Type),
    86  				vtadminproto.TabletServingStateString(tablet.State),
    87  				topoproto.TabletAliasString(tablet.Tablet.Alias),
    88  				tablet.Tablet.Hostname,
    89  				"", // (TODO:@amason) use real values here
    90  			})
    91  		}
    92  
    93  		return &rows{
    94  			cols:   columns,
    95  			vals:   vals,
    96  			pos:    0,
    97  			closed: false,
    98  		}, nil
    99  	}
   100  
   101  	return nil, fmt.Errorf("%w: %q %v", ErrUnrecognizedQuery, query, args)
   102  }