// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sql
import (
"context"
"database/sql/driver"
"errors"
"fmt"
"io"
"log"
"reflect"
"sort"
"strconv"
"strings"
"sync"
"testing"
"time"
)
var _ = log.Printf
// fakeDriver is a fake database that implements Go's driver.Driver
// interface, just for testing.
//
// It speaks a query language that's semantically similar to but
// syntactically different and simpler than SQL. The syntax is as
// follows:
//
// WIPE
// CREATE|<tablename>|<col>=<type>,<col>=<type>,...
// where types are: "string", [u]int{8,16,32,64}, "bool"
// INSERT|<tablename>|col=val,col2=val2,col3=?
// SELECT|<tablename>|projectcol1,projectcol2|filtercol=?,filtercol2=?
// SELECT|<tablename>|projectcol1,projectcol2|filtercol=?param1,filtercol2=?param2
//
// Any of these can be preceded by PANIC|<method>|, to cause the
// named method on fakeStmt to panic.
//
// Any of these can be proceeded by WAIT|<duration>|, to cause the
// named method on fakeStmt to sleep for the specified duration.
//
// Multiple of these can be combined when separated with a semicolon.
//
// When opening a fakeDriver's database, it starts empty with no
// tables. All tables and data are stored in memory only.
type fakeDriver struct {
mu sync.Mutex // guards 3 following fields
openCount int // conn opens
closeCount int // conn closes
waitCh chan struct{}
waitingCh chan struct{}
dbs map[string]*fakeDB
}
type fakeConnector struct {
name string
waiter func(context.Context)
}
func (c *fakeConnector) Connect(context.Context) (driver.Conn, error) {
conn, err := fdriver.Open(c.name)
conn.(*fakeConn).waiter = c.waiter
return conn, err
}
func (c *fakeConnector) Driver() driver.Driver {
return fdriver
}
type fakeDriverCtx struct {
fakeDriver
}
var _ driver.DriverContext = &fakeDriverCtx{}
func (cc *fakeDriverCtx) OpenConnector(name string) (driver.Connector, error) {
return &fakeConnector{name: name}, nil
}
type fakeDB struct {
name string
mu sync.Mutex
tables map[string]*table
badConn bool
allowAny bool
}
type table struct {
mu sync.Mutex
colname []string
coltype []string
rows []*row
}
func (t *table) columnIndex(name string) int {
for n, nname := range t.colname {
if name == nname {
return n
}
}
return -1
}
type row struct {
cols []interface{} // must be same size as its table colname + coltype
}
type memToucher interface {
// touchMem reads & writes some memory, to help find data races.
touchMem()
}
type fakeConn struct {
db *fakeDB // where to return ourselves to
currTx *fakeTx
// Every operation writes to line to enable the race detector
// check for data races.
line int64
// Stats for tests:
mu sync.Mutex
stmtsMade int
stmtsClosed int
numPrepare int
// bad connection tests; see isBad()
bad bool
stickyBad bool
skipDirtySession bool // tests that use Conn should set this to true.
// dirtySession tests ResetSession, true if a query has executed
// until ResetSession is called.
dirtySession bool
// The waiter is called before each query. May be used in place of the "WAIT"
// directive.
waiter func(context.Context)
}
func (c *fakeConn) touchMem() {
c.line++
}
func (c *fakeConn) incrStat(v *int) {
c.mu.Lock()
*v++
c.mu.Unlock()
}
type fakeTx struct {
c *fakeConn
}
type boundCol struct {
Column string
Placeholder string
Ordinal int
}
type fakeStmt struct {
memToucher
c *fakeConn
q string // just for debugging
cmd string
table string
panic string
wait time.Duration
next *fakeStmt // used for returning multiple results.
closed bool
colName []string // used by CREATE, INSERT, SELECT (selected columns)
colType []string // used by CREATE
colValue []interface{} // used by INSERT (mix of strings and "?" for bound params)
placeholders int // used by INSERT/SELECT: number of ? params
whereCol []boundCol // used by SELECT (all placeholders)
placeholderConverter []driver.ValueConverter // used by INSERT
}
var fdriver driver.Driver = &fakeDriver{}
func init() {
Register("test", fdriver)
}
func contains(list []string, y string) bool {
for _, x := range list {
if x == y {
return true
}
}
return false
}
type Dummy struct {
driver.Driver
}
func TestDrivers(t *testing.T) {
unregisterAllDrivers()
Register("test", fdriver)
Register("invalid", Dummy{})
all := Drivers()
if len(all) < 2 || !sort.StringsAreSorted(all) || !contains(all, "test") || !contains(all, "invalid") {
t.Fatalf("Drivers = %v, want sorted list with at least [invalid, test]", all)
}
}
// hook to simulate connection failures
var hookOpenErr struct {
sync.Mutex
fn func() error
}
func setHookOpenErr(fn func() error) {
hookOpenErr.Lock()
defer hookOpenErr.Unlock()
hookOpenErr.fn = fn
}
// Supports dsn forms:
// <dbname>
// <dbname>;<opts> (only currently supported option is `badConn`,
// which causes driver.ErrBadConn to be returned on
// every other conn.Begin())
func (d *fakeDriver) Open(dsn string) (driver.Conn, error) {
hookOpenErr.Lock()
fn := hookOpenErr.fn
hookOpenErr.Unlock()
if fn != nil {
if err := fn(); err != nil {
return nil, err
}
}
parts := strings.Split(dsn, ";")
if len(parts) < 1 {
return nil, errors.New("fakedb: no database name")
}
name := parts[0]
db := d.getDB(name)
d.mu.Lock()
d.openCount++
d.mu.Unlock()
conn := &fakeConn{db: db}
if len(parts) >= 2 && parts[1] == "badConn" {
conn.bad = true
}
if d.waitCh != nil {
d.waitingCh <- struct{}{}
<-d.waitCh
d.waitCh = nil
d.waitingCh = nil
}
return conn, nil
}
func (d *fakeDriver) getDB(name string) *fakeDB {
d.mu.Lock()
defer d.mu.Unlock()
if d.dbs == nil {
d.dbs = make(map[string]*fakeDB)
}
db, ok := d.dbs[name]
if !ok {
db = &fakeDB{name: name}
d.dbs[name] = db
}
return db
}
func (db *fakeDB) wipe() {
db.mu.Lock()
defer db.mu.Unlock()
db.tables = nil
}
func (db *fakeDB) createTable(name string, columnNames, columnTypes []string) error {
db.mu.Lock()
defer db.mu.Unlock()
if db.tables == nil {
db.tables = make(map[string]*table)
}
if _, exist := db.tables[name]; exist {
return fmt.Errorf("fakedb: table %q already exists", name)
}
if len(columnNames) != len(columnTypes) {
return fmt.Errorf("fakedb: create table of %q len(names) != len(types): %d vs %d",
name, len(columnNames), len(columnTypes))
}
db.tables[name] = &table{colname: columnNames, coltype: columnTypes}
return nil
}
// must be called with db.mu lock held
func (db *fakeDB) table(table string) (*table, bool) {
if db.tables == nil {
return nil, false
}
t, ok := db.tables[table]
return t, ok
}
func (db *fakeDB) columnType(table, column string) (typ string, ok bool) {
db.mu.Lock()
defer db.mu.Unlock()
t, ok := db.table(table)
if !ok {
return
}
for n, cname := range t.colname {
if cname == column {
return t.coltype[n], true
}
}
return "", false
}
func (c *fakeConn) isBad() bool {
if c.stickyBad {
return true
} else if c.bad {
if c.db == nil {
return false
}
// alternate between bad conn and not bad conn
c.db.badConn = !c.db.badConn
return c.db.badConn
} else {
return false
}
}
func (c *fakeConn) isDirtyAndMark() bool {
if c.skipDirtySession {
return false
}
if c.currTx != nil {
c.dirtySession = true
return false
}
if c.dirtySession {
return true
}
c.dirtySession = true
return false
}
func (c *fakeConn) Begin() (driver.Tx, error) {
if c.isBad() {
return nil, driver.ErrBadConn
}
if c.currTx != nil {
return nil, errors.New("fakedb: already in a transaction")
}
c.touchMem()
c.currTx = &fakeTx{c: c}
return c.currTx, nil
}
var hookPostCloseConn struct {
sync.Mutex
fn func(*fakeConn, error)
}
func setHookpostCloseConn(fn func(*fakeConn, error)) {
hookPostCloseConn.Lock()
defer hookPostCloseConn.Unlock()
hookPostCloseConn.fn = fn
}
var testStrictClose *testing.T
// setStrictFakeConnClose sets the t to Errorf on when fakeConn.Close
// fails to close. If nil, the check is disabled.
func setStrictFakeConnClose(t *testing.T) {
testStrictClose = t
}
func (c *fakeConn) ResetSession(ctx context.Context) error {
c.dirtySession = false
if c.isBad() {
return driver.ErrBadConn
}
return nil
}
func (c *fakeConn) Close() (err error) {
drv := fdriver.(*fakeDriver)
defer func() {
if err != nil && testStrictClose != nil {
testStrictClose.Errorf("failed to close a test fakeConn: %v", err)
}
hookPostCloseConn.Lock()
fn := hookPostCloseConn.fn
hookPostCloseConn.Unlock()
if fn != nil {
fn(c, err)
}
if err == nil {
drv.mu.Lock()
drv.closeCount++
drv.mu.Unlock()
}
}()
c.touchMem()
if c.currTx != nil {
return errors.New("fakedb: can't close fakeConn; in a Transaction")
}
if c.db == nil {
return errors.New("fakedb: can't close fakeConn; already closed")
}
if c.stmtsMade > c.stmtsClosed {
return errors.New("fakedb: can't close; dangling statement(s)")
}
c.db = nil
return nil
}
func checkSubsetTypes(allowAny bool, args []driver.NamedValue) error {
for _, arg := range args {
switch arg.Value.(type) {
case int64, float64, bool, nil, []byte, string, time.Time:
default:
if !allowAny {
return fmt.Errorf("fakedb: invalid argument ordinal %[1]d: %[2]v, type %[2]T", arg.Ordinal, arg.Value)
}
}
}
return nil
}
func (c *fakeConn) Exec(query string, args []driver.Value) (driver.Result, error) {
// Ensure that ExecContext is called if available.
panic("ExecContext was not called.")
}
func (c *fakeConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
// This is an optional interface, but it's implemented here
// just to check that all the args are of the proper types.
// ErrSkip is returned so the caller acts as if we didn't
// implement this at all.
err := checkSubsetTypes(c.db.allowAny, args)
if err != nil {
return nil, err
}
return nil, driver.ErrSkip
}
func (c *fakeConn) Query(query string, args []driver.Value) (driver.Rows, error) {
// Ensure that ExecContext is called if available.
panic("QueryContext was not called.")
}
func (c *fakeConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
// This is an optional interface, but it's implemented here
// just to check that all the args are of the proper types.
// ErrSkip is returned so the caller acts as if we didn't
// implement this at all.
err := checkSubsetTypes(c.db.allowAny, args)
if err != nil {
return nil, err
}
return nil, driver.ErrSkip
}
func errf(msg string, args ...interface{}) error {
return errors.New("fakedb: " + fmt.Sprintf(msg, args...))
}
// parts are table|selectCol1,selectCol2|whereCol=?,whereCol2=?
// (note that where columns must always contain ? marks,
// just a limitation for fakedb)
func (c *fakeConn) prepareSelect(stmt *fakeStmt, parts []string) (*fakeStmt, error) {
if len(parts) != 3 {
stmt.Close()
return nil, errf("invalid SELECT syntax with %d parts; want 3", len(parts))
}
stmt.table = parts[0]
stmt.colName = strings.Split(parts[1], ",")
for n, colspec := range strings.Split(parts[2], ",") {
if colspec == "" {
continue
}
nameVal := strings.Split(colspec, "=")
if len(nameVal) != 2 {
stmt.Close()
return nil, errf("SELECT on table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
}
column, value := nameVal[0], nameVal[1]
_, ok := c.db.columnType(stmt.table, column)
if !ok {
stmt.Close()
return nil, errf("SELECT on table %q references non-existent column %q", stmt.table, column)
}
if !strings.HasPrefix(value, "?") {
stmt.Close()
return nil, errf("SELECT on table %q has pre-bound value for where column %q; need a question mark",
stmt.table, column)
}
stmt.placeholders++
stmt.whereCol = append(stmt.whereCol, boundCol{Column: column, Placeholder: value, Ordinal: stmt.placeholders})
}
return stmt, nil
}
// parts are table|col=type,col2=type2
func (c *fakeConn) prepareCreate(stmt *fakeStmt, parts []string) (*fakeStmt, error) {
if len(parts) != 2 {
stmt.Close()
return nil, errf("invalid CREATE syntax with %d parts; want 2", len(parts))
}
stmt.table = parts[0]
for n, colspec := range strings.Split(parts[1], ",") {
nameType := strings.Split(colspec, "=")
if len(nameType) != 2 {
stmt.Close()
return nil, errf("CREATE table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
}
stmt.colName = append(stmt.colName, nameType[0])
stmt.colType = append(stmt.colType, nameType[1])
}
return stmt, nil
}
// parts are table|col=?,col2=val
func (c *fakeConn) prepareInsert(ctx context.Context, stmt *fakeStmt, parts []string) (*fakeStmt, error) {
if len(parts) != 2 {
stmt.Close()
return nil, errf("invalid INSERT syntax with %d parts; want 2", len(parts))
}
stmt.table = parts[0]
for n, colspec := range strings.Split(parts[1], ",") {
nameVal := strings.Split(colspec, "=")
if len(nameVal) != 2 {
stmt.Close()
return nil, errf("INSERT table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
}
column, value := nameVal[0], nameVal[1]
ctype, ok := c.db.columnType(stmt.table, column)
if !ok {
stmt.Close()
return nil, errf("INSERT table %q references non-existent column %q", stmt.table, column)
}
stmt.colName = append(stmt.colName, column)
if !strings.HasPrefix(value, "?") {
var subsetVal interface{}
// Convert to driver subset type
switch ctype {
case "string":
subsetVal = []byte(value)
case "blob":
subsetVal = []byte(value)
case "int32":
i, err := strconv.Atoi(value)
if err != nil {
stmt.Close()
return nil, errf("invalid conversion to int32 from %q", value)
}
subsetVal = int64(i) // int64 is a subset type, but not int32
case "table": // For testing cursor reads.
c.skipDirtySession = true
vparts := strings.Split(value, "!")
substmt, err := c.PrepareContext(ctx, fmt.Sprintf("SELECT|%s|%s|", vparts[0], strings.Join(vparts[1:], ",")))
if err != nil {
return nil, err
}
cursor, err := (substmt.(driver.StmtQueryContext)).QueryContext(ctx, []driver.NamedValue{})
substmt.Close()
if err != nil {
return nil, err
}
subsetVal = cursor
default:
stmt.Close()
return nil, errf("unsupported conversion for pre-bound parameter %q to type %q", value, ctype)
}
stmt.colValue = append(stmt.colValue, subsetVal)
} else {
stmt.placeholders++
stmt.placeholderConverter = append(stmt.placeholderConverter, converterForType(ctype))
stmt.colValue = append(stmt.colValue, value)
}
}
return stmt, nil
}
// hook to simulate broken connections
var hookPrepareBadConn func() bool
func (c *fakeConn) Prepare(query string) (driver.Stmt, error) {
panic("use PrepareContext")
}
func (c *fakeConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
c.numPrepare++
if c.db == nil {
panic("nil c.db; conn = " + fmt.Sprintf("%#v", c))
}
if c.stickyBad || (hookPrepareBadConn != nil && hookPrepareBadConn()) {
return nil, driver.ErrBadConn
}
c.touchMem()
var firstStmt, prev *fakeStmt
for _, query := range strings.Split(query, ";") {
parts := strings.Split(query, "|")
if len(parts) < 1 {
return nil, errf("empty query")
}
stmt := &fakeStmt{q: query, c: c, memToucher: c}
if firstStmt == nil {
firstStmt = stmt
}
if len(parts) >= 3 {
switch parts[0] {
case "PANIC":
stmt.panic = parts[1]
parts = parts[2:]
case "WAIT":
wait, err := time.ParseDuration(parts[1])
if err != nil {
return nil, errf("expected section after WAIT to be a duration, got %q %v", parts[1], err)
}
parts = parts[2:]
stmt.wait = wait
}
}
cmd := parts[0]
stmt.cmd = cmd
parts = parts[1:]
if c.waiter != nil {
c.waiter(ctx)
}
if stmt.wait > 0 {
wait := time.NewTimer(stmt.wait)
select {
case <-wait.C:
case <-ctx.Done():
wait.Stop()
return nil, ctx.Err()
}
}
c.incrStat(&c.stmtsMade)
var err error
switch cmd {
case "WIPE":
// Nothing
case "SELECT":
stmt, err = c.prepareSelect(stmt, parts)
case "CREATE":
stmt, err = c.prepareCreate(stmt, parts)
case "INSERT":
stmt, err = c.prepareInsert(ctx, stmt, parts)
case "NOSERT":
// Do all the prep-work like for an INSERT but don't actually insert the row.
// Used for some of the concurrent tests.
stmt, err = c.prepareInsert(ctx, stmt, parts)
default:
stmt.Close()
return nil, errf("unsupported command type %q", cmd)
}
if err != nil {
return nil, err
}
if prev != nil {
prev.next = stmt
}
prev = stmt
}
return firstStmt, nil
}
func (s *fakeStmt) ColumnConverter(idx int) driver.ValueConverter {
if s.panic == "ColumnConverter" {
panic(s.panic)
}
if len(s.placeholderConverter) == 0 {
return driver.DefaultParameterConverter
}
return s.placeholderConverter[idx]
}
func (s *fakeStmt) Close() error {
if s.panic == "Close" {
panic(s.panic)
}
if s.c == nil {
panic("nil conn in fakeStmt.Close")
}
if s.c.db == nil {
panic("in fakeStmt.Close, conn's db is nil (already closed)")
}
s.touchMem()
if !s.closed {
s.c.incrStat(&s.c.stmtsClosed)
s.closed = true
}
if s.next != nil {
s.next.Close()
}
return nil
}
var errClosed = errors.New("fakedb: statement has been closed")
// hook to simulate broken connections
var hookExecBadConn func() bool
func (s *fakeStmt) Exec(args []driver.Value) (driver.Result, error) {
panic("Using ExecContext")
}
func (s *fakeStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
if s.panic == "Exec" {
panic(s.panic)
}
if s.closed {
return nil, errClosed
}
if s.c.stickyBad || (hookExecBadConn != nil && hookExecBadConn()) {
return nil, driver.ErrBadConn
}
if s.c.isDirtyAndMark() {
return nil, errors.New("fakedb: session is dirty")
}
err := checkSubsetTypes(s.c.db.allowAny, args)
if err != nil {
return nil, err
}
s.touchMem()
if s.wait > 0 {
time.Sleep(s.wait)
}
select {
default:
case <-ctx.Done():
return nil, ctx.Err()
}
db := s.c.db
switch s.cmd {
case "WIPE":
db.wipe()
return driver.ResultNoRows, nil
case "CREATE":
if err := db.createTable(s.table, s.colName, s.colType); err != nil {
return nil, err
}
return driver.ResultNoRows, nil
case "INSERT":
return s.execInsert(args, true)
case "NOSERT":
// Do all the prep-work like for an INSERT but don't actually insert the row.
// Used for some of the concurrent tests.
return s.execInsert(args, false)
}
return nil, fmt.Errorf("fakedb: unimplemented statement Exec command type of %q", s.cmd)
}
// When doInsert is true, add the row to the table.
// When doInsert is false do prep-work and error checking, but don't
// actually add the row to the table.
func (s *fakeStmt) execInsert(args []driver.NamedValue, doInsert bool) (driver.Result, error) {
db := s.c.db
if len(args) != s.placeholders {
panic("error in pkg db; should only get here if size is correct")
}
db.mu.Lock()
t, ok := db.table(s.table)
db.mu.Unlock()
if !ok {
return nil, fmt.Errorf("fakedb: table %q doesn't exist", s.table)
}
t.mu.Lock()
defer t.mu.Unlock()
var cols []interface{}
if doInsert {
cols = make([]interface{}, len(t.colname))
}
argPos := 0
for n, colname := range s.colName {
colidx := t.columnIndex(colname)
if colidx == -1 {
return nil, fmt.Errorf("fakedb: column %q doesn't exist or dropped since prepared statement was created", colname)
}
var val interface{}
if strvalue, ok := s.colValue[n].(string); ok && strings.HasPrefix(strvalue, "?") {
if strvalue == "?" {
val = args[argPos].Value
} else {
// Assign value from argument placeholder name.
for _, a := range args {
if a.Name == strvalue[1:] {
val = a.Value
break
}
}
}
argPos++
} else {
val = s.colValue[n]
}
if doInsert {
cols[colidx] = val
}
}
if doInsert {
t.rows = append(t.rows, &row{cols: cols})
}
return driver.RowsAffected(1), nil
}
// hook to simulate broken connections
var hookQueryBadConn func() bool
func (s *fakeStmt) Query(args []driver.Value) (driver.Rows, error) {
panic("Use QueryContext")
}
func (s *fakeStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
if s.panic == "Query" {
panic(s.panic)
}
if s.closed {
return nil, errClosed
}
if s.c.stickyBad || (hookQueryBadConn != nil && hookQueryBadConn()) {
return nil, driver.ErrBadConn
}
if s.c.isDirtyAndMark() {
return nil, errors.New("fakedb: session is dirty")
}
err := checkSubsetTypes(s.c.db.allowAny, args)
if err != nil {
return nil, err
}
s.touchMem()
db := s.c.db
if len(args) != s.placeholders {
panic("error in pkg db; should only get here if size is correct")
}
setMRows := make([][]*row, 0, 1)
setColumns := make([][]string, 0, 1)
setColType := make([][]string, 0, 1)
for {
db.mu.Lock()
t, ok := db.table(s.table)
db.mu.Unlock()
if !ok {
return nil, fmt.Errorf("fakedb: table %q doesn't exist", s.table)
}
if s.table == "magicquery" {
if len(s.whereCol) == 2 && s.whereCol[0].Column == "op" && s.whereCol[1].Column == "millis" {
if args[0].Value == "sleep" {
time.Sleep(time.Duration(args[1].Value.(int64)) * time.Millisecond)
}
}
}
t.mu.Lock()
colIdx := make(map[string]int) // select column name -> column index in table
for _, name := range s.colName {
idx := t.columnIndex(name)
if idx == -1 {
t.mu.Unlock()
return nil, fmt.Errorf("fakedb: unknown column name %q", name)
}
colIdx[name] = idx
}
mrows := []*row{}
rows:
for _, trow := range t.rows {
// Process the where clause, skipping non-match rows. This is lazy
// and just uses fmt.Sprintf("%v") to test equality. Good enough
// for test code.
for _, wcol := range s.whereCol {
idx := t.columnIndex(wcol.Column)
if idx == -1 {
t.mu.Unlock()
return nil, fmt.Errorf("fakedb: invalid where clause column %q", wcol)
}
tcol := trow.cols[idx]
if bs, ok := tcol.([]byte); ok {
// lazy hack to avoid sprintf %v on a []byte
tcol = string(bs)
}
var argValue interface{}
if wcol.Placeholder == "?" {
argValue = args[wcol.Ordinal-1].Value
} else {
// Assign arg value from placeholder name.
for _, a := range args {
if a.Name == wcol.Placeholder[1:] {
argValue = a.Value
break
}
}
}
if fmt.Sprintf("%v", tcol) != fmt.Sprintf("%v", argValue) {
continue rows
}
}
mrow := &row{cols: make([]interface{}, len(s.colName))}
for seli, name := range s.colName {
mrow.cols[seli] = trow.cols[colIdx[name]]
}
mrows = append(mrows, mrow)
}
var colType []string
for _, column := range s.colName {
colType = append(colType, t.coltype[t.columnIndex(column)])
}
t.mu.Unlock()
setMRows = append(setMRows, mrows)
setColumns = append(setColumns, s.colName)
setColType = append(setColType, colType)
if s.next == nil {
break
}
s = s.next
}
cursor := &rowsCursor{
parentMem: s.c,
posRow: -1,
rows: setMRows,
cols: setColumns,
colType: setColType,
errPos: -1,
}
return cursor, nil
}
func (s *fakeStmt) NumInput() int {
if s.panic == "NumInput" {
panic(s.panic)
}
return s.placeholders
}
// hook to simulate broken connections
var hookCommitBadConn func() bool
func (tx *fakeTx) Commit() error {
tx.c.currTx = nil
if hookCommitBadConn != nil && hookCommitBadConn() {
return driver.ErrBadConn
}
tx.c.touchMem()
return nil
}
// hook to simulate broken connections
var hookRollbackBadConn func() bool
func (tx *fakeTx) Rollback() error {
tx.c.currTx = nil
if hookRollbackBadConn != nil && hookRollbackBadConn() {
return driver.ErrBadConn
}
tx.c.touchMem()
return nil
}
type rowsCursor struct {
parentMem memToucher
cols [][]string
colType [][]string
posSet int
posRow int
rows [][]*row
closed bool
// errPos and err are for making Next return early with error.
errPos int
err error
// a clone of slices to give out to clients, indexed by the
// original slice's first byte address. we clone them
// just so we're able to corrupt them on close.
bytesClone map[*byte][]byte
// Every operation writes to line to enable the race detector
// check for data races.
// This is separate from the fakeConn.line to allow for drivers that
// can start multiple queries on the same transaction at the same time.
line int64
}
func (rc *rowsCursor) touchMem() {
rc.parentMem.touchMem()
rc.line++
}
func (rc *rowsCursor) Close() error {
rc.touchMem()
rc.parentMem.touchMem()
rc.closed = true
return nil
}
func (rc *rowsCursor) Columns() []string {
return rc.cols[rc.posSet]
}
func (rc *rowsCursor) ColumnTypeScanType(index int) reflect.Type {
return colTypeToReflectType(rc.colType[rc.posSet][index])
}
var rowsCursorNextHook func(dest []driver.Value) error
func (rc *rowsCursor) Next(dest []driver.Value) error {
if rowsCursorNextHook != nil {
return rowsCursorNextHook(dest)
}
if rc.closed {
return errors.New("fakedb: cursor is closed")
}
rc.touchMem()
rc.posRow++
if rc.posRow == rc.errPos {
return rc.err
}
if rc.posRow >= len(rc.rows[rc.posSet]) {
return io.EOF // per interface spec
}
for i, v := range rc.rows[rc.posSet][rc.posRow].cols {
// TODO(bradfitz): convert to subset types? naah, I
// think the subset types should only be input to
// driver, but the sql package should be able to handle
// a wider range of types coming out of drivers. all
// for ease of drivers, and to prevent drivers from
// messing up conversions or doing them differently.
dest[i] = v
if bs, ok := v.([]byte); ok {
if rc.bytesClone == nil {
rc.bytesClone = make(map[*byte][]byte)
}
clone, ok := rc.bytesClone[&bs[0]]
if !ok {
clone = make([]byte, len(bs))
copy(clone, bs)
rc.bytesClone[&bs[0]] = clone
}
dest[i] = clone
}
}
return nil
}
func (rc *rowsCursor) HasNextResultSet() bool {
rc.touchMem()
return rc.posSet < len(rc.rows)-1
}
func (rc *rowsCursor) NextResultSet() error {
rc.touchMem()
if rc.HasNextResultSet() {
rc.posSet++
rc.posRow = -1
return nil
}
return io.EOF // Per interface spec.
}
// fakeDriverString is like driver.String, but indirects pointers like
// DefaultValueConverter.
//
// This could be surprising behavior to retroactively apply to
// driver.String now that Go1 is out, but this is convenient for
// our TestPointerParamsAndScans.
//
type fakeDriverString struct{}
func (fakeDriverString) ConvertValue(v interface{}) (driver.Value, error) {
switch c := v.(type) {
case string, []byte:
return v, nil
case *string:
if c == nil {
return nil, nil
}
return *c, nil
}
return fmt.Sprintf("%v", v), nil
}
type anyTypeConverter struct{}
func (anyTypeConverter) ConvertValue(v interface{}) (driver.Value, error) {
return v, nil
}
func converterForType(typ string) driver.ValueConverter {
switch typ {
case "bool":
return driver.Bool
case "nullbool":
return driver.Null{Converter: driver.Bool}
case "int32":
return driver.Int32
case "string":
return driver.NotNull{Converter: fakeDriverString{}}
case "nullstring":
return driver.Null{Converter: fakeDriverString{}}
case "int64":
// TODO(coopernurse): add type-specific converter
return driver.NotNull{Converter: driver.DefaultParameterConverter}
case "nullint64":
// TODO(coopernurse): add type-specific converter
return driver.Null{Converter: driver.DefaultParameterConverter}
case "float64":
// TODO(coopernurse): add type-specific converter
return driver.NotNull{Converter: driver.DefaultParameterConverter}
case "nullfloat64":
// TODO(coopernurse): add type-specific converter
return driver.Null{Converter: driver.DefaultParameterConverter}
case "datetime":
return driver.DefaultParameterConverter
case "any":
return anyTypeConverter{}
}
panic("invalid fakedb column type of " + typ)
}
func colTypeToReflectType(typ string) reflect.Type {
switch typ {
case "bool":
return reflect.TypeOf(false)
case "nullbool":
return reflect.TypeOf(NullBool{})
case "int32":
return reflect.TypeOf(int32(0))
case "string":
return reflect.TypeOf("")
case "nullstring":
return reflect.TypeOf(NullString{})
case "int64":
return reflect.TypeOf(int64(0))
case "nullint64":
return reflect.TypeOf(NullInt64{})
case "float64":
return reflect.TypeOf(float64(0))
case "nullfloat64":
return reflect.TypeOf(NullFloat64{})
case "datetime":
return reflect.TypeOf(time.Time{})
case "any":
return reflect.TypeOf(new(interface{})).Elem()
}
panic("invalid fakedb column type of " + typ)
}